diff --git a/uppsrc/Core/heapdbg.cpp b/uppsrc/Core/heapdbg.cpp index 6b8beba35..7e9f37e4a 100644 --- a/uppsrc/Core/heapdbg.cpp +++ b/uppsrc/Core/heapdbg.cpp @@ -185,6 +185,7 @@ void MemoryDumpLeaks() MemoryCheckDebug(); DbgBlkHeader *p = dbg_live.next; bool leaks = false; + int n = 0; while(p != &dbg_live) { if(p->serial) { if(!leaks) @@ -194,6 +195,11 @@ void MemoryDumpLeaks() DbgFormat(b, p); VppLog() << '\n' << b << ": "; HexDump(VppLog(), p + 1, (int)(uintptr_t)p->size, 64); + if(++n > 16) { + if(p->next != &dbg_live) + VppLog() << "\n*** TOO MANY LEAKS TO LIST THEM ALL\n"; + break; + } } p = p->next; } diff --git a/uppsrc/plugin/lz4/Compress.cpp b/uppsrc/plugin/lz4/Compress.cpp index 6cb6d76e2..870f1bfa0 100644 --- a/uppsrc/plugin/lz4/Compress.cpp +++ b/uppsrc/plugin/lz4/Compress.cpp @@ -1,9 +1,5 @@ #include "lz4.h" -#ifndef flagCOMPLEXLZ4 - -#define LLOG(x) // LOG(x) - namespace Upp { void LZ4CompressStream::Open(Stream& out_) @@ -29,6 +25,7 @@ void LZ4CompressStream::Alloc() buffer.Alloc(sz); outbuf.Alloc(N * LZ4_compressBound(BLOCK_BYTES)); outsz.Alloc(N); + Stream::buffer = ~buffer; wrlim = ~buffer + sz; ptr = ~buffer; } @@ -93,7 +90,6 @@ void LZ4CompressStream::FlushOut() int origsize = int(ptr - ~buffer); xxh.Put(~buffer, origsize); pos += origsize; - WhenPos(pos); ptr = ~buffer; } @@ -121,8 +117,6 @@ void LZ4CompressStream::_Put(int w) void LZ4CompressStream::_Put(const void *data, dword size) { - LLOG("Put " << size); - ASSERT(compress >= 0); const char *s = reinterpret_cast(data); @@ -148,6 +142,7 @@ void LZ4CompressStream::_Put(const void *data, dword size) LZ4CompressStream::LZ4CompressStream() { + style = STRM_WRITE; concurrent = false; out = NULL; } @@ -158,5 +153,3 @@ LZ4CompressStream::~LZ4CompressStream() } }; - -#endif \ No newline at end of file diff --git a/uppsrc/plugin/lz4/Decompress.cpp b/uppsrc/plugin/lz4/Decompress.cpp index 7c85935a4..b0af26361 100644 --- a/uppsrc/plugin/lz4/Decompress.cpp +++ b/uppsrc/plugin/lz4/Decompress.cpp @@ -4,7 +4,6 @@ namespace Upp { - void LZ4DecompressStream::Init() { for(int i = 0; i < 16; i++) @@ -14,7 +13,8 @@ void LZ4DecompressStream::Init() dlen = 0; pos = 0; eof = false; - ptr = rdlim = NULL; + static byte h; + ptr = rdlim = buffer = &h; xxh.Reset(); ClearError(); } @@ -65,11 +65,12 @@ bool LZ4DecompressStream::Open(Stream& in_) bool LZ4DecompressStream::Next() { + pos += ptr - buffer; + ptr = rdlim = buffer; if(ii < count) { - pos += dlen; ptr = (byte *)~wb[ii].d; - dlen = wb[ii].dlen; - rdlim = ptr + dlen; + Stream::buffer = ptr; + rdlim = ptr + wb[ii].dlen; ii++; return true; } @@ -205,6 +206,7 @@ dword LZ4DecompressStream::_Get(void *data, dword size) LZ4DecompressStream::LZ4DecompressStream() { + style = STRM_READ|STRM_LOADING; in = NULL; concurrent = false; } @@ -213,4 +215,12 @@ LZ4DecompressStream::~LZ4DecompressStream() { } +bool IsLZ4(Stream& s) +{ + int64 pos = s.GetPos(); + bool b = s.Get32le() == LZ4F_MAGIC; + s.Seek(pos); + return b; +} + }; diff --git a/uppsrc/plugin/lz4/lz4.h b/uppsrc/plugin/lz4/lz4.h index 73fd5a1a6..6b660896a 100644 --- a/uppsrc/plugin/lz4/lz4.h +++ b/uppsrc/plugin/lz4/lz4.h @@ -50,8 +50,6 @@ protected: void FlushOut(); public: - Event WhenPos; - #ifdef _MULTITHREADED void Concurrent(bool b = true); #endif @@ -77,7 +75,6 @@ private: Buffer c, d; // compressed, decompressed data int clen = 0, dlen = 0; // compressed, decompressed len - bool Decompress(); void Clear() { c.Clear(); d.Clear(); } }; Workblock wb[16]; @@ -102,8 +99,6 @@ private: void Fetch(); public: - Callback2 WhenOut; - bool Open(Stream& in); #ifdef _MULTITHREADED diff --git a/uppsrc/plugin/zstd/Compress.cpp b/uppsrc/plugin/zstd/Compress.cpp new file mode 100644 index 000000000..1cc5e5041 --- /dev/null +++ b/uppsrc/plugin/zstd/Compress.cpp @@ -0,0 +1,138 @@ +#include "zstd.h" + +namespace Upp { + +// we simply store data as series of complete Zstd frames, as library gives us no better chance +// to do it in MT + +void ZstdCompressStream::Open(Stream& out_, int level_) +{ + out = &out_; + level = level_; + ClearError(); + pos = 0; + Alloc(); +} + +void ZstdCompressStream::Alloc() +{ + int N = 16; + int sz = concurrent ? N * BLOCK_BYTES : BLOCK_BYTES; + buffer.Alloc(sz); + outbuf.Alloc(N * ZSTD_compressBound(BLOCK_BYTES)); + outsz.Alloc(N); + Stream::buffer = ~buffer; + wrlim = ~buffer + sz; + ptr = ~buffer; +} + +#ifdef _MULTITHREADED +void ZstdCompressStream::Concurrent(bool b) +{ + FlushOut(); + concurrent = b; + Alloc(); +} +#endif + +void ZstdCompressStream::FlushOut() +{ + if(ptr == (byte *)~buffer) + return; + + CoWork co; + + int osz = (int)ZSTD_compressBound(BLOCK_BYTES); + byte *t = ~outbuf; + int ii = 0; + for(byte *s = ~buffer; s < ptr; s += BLOCK_BYTES) { + int origsize = min((int)BLOCK_BYTES, int(ptr - s)); +#ifdef _MULTITHREADED + if(concurrent) + co & [=] { + outsz[ii] = (int)ZSTD_compress(t, osz, s, origsize, level); + }; + else +#endif + outsz[ii] = (int)ZSTD_compress(t, osz, s, origsize, level); + ii++; + t += osz; + } + + if(concurrent) + co.Finish(); + + t = ~outbuf; + for(int i = 0; i < ii; i++) { + int clen = outsz[i]; + if(clen < 0) { + SetError(); + return; + } + out->Put(t, clen); + t += osz; + } + + int origsize = int(ptr - ~buffer); + pos += origsize; + ptr = ~buffer; +} + +void ZstdCompressStream::Close() +{ + ASSERT(compress >= 0); + if(out) { + FlushOut(); + out = NULL; + } +} + +bool ZstdCompressStream::IsOpen() const +{ + return out && out->IsOpen(); +} + +void ZstdCompressStream::_Put(int w) +{ + FlushOut(); + *ptr++ = w; +} + +void ZstdCompressStream::_Put(const void *data, dword size) +{ + ASSERT(compress >= 0); + + const char *s = reinterpret_cast(data); + + while(size > 0) { + if(IsError() || out && out->IsError()) + return; + dword n = dword(wrlim - ptr); + if(size >= n) { + memcpy(ptr, s, n); + ptr = wrlim; + FlushOut(); + size -= n; + s += n; + } + else { + memcpy(ptr, s, size); + ptr += size; + break; + } + } +} + +ZstdCompressStream::ZstdCompressStream() +{ + style = STRM_WRITE; + concurrent = false; + out = NULL; +} + +ZstdCompressStream::~ZstdCompressStream() +{ + Close(); +} + +}; diff --git a/uppsrc/plugin/zstd/Decompress.cpp b/uppsrc/plugin/zstd/Decompress.cpp new file mode 100644 index 000000000..31ec1fc55 --- /dev/null +++ b/uppsrc/plugin/zstd/Decompress.cpp @@ -0,0 +1,272 @@ +#include "zstd.h" + +#define LLOG(x) // LOG(x) + +namespace Upp { + + +void ZstdDecompressStream::Init() +{ + for(int i = 0; i < 16; i++) + wb[i].Clear(); + ii = 0; + count = 0; + dlen = 0; + pos = 0; + eof = false; + static byte h; + ptr = rdlim = buffer = &h; + ClearError(); +} + +bool ZstdDecompressStream::Open(Stream& in_) +{ + Init(); + in = &in_; + return true; +} + +bool ZstdDecompressStream::Next() +{ + pos += ptr - buffer; + ptr = rdlim = buffer; + if(ii < count) { + const Workblock& w = wb[ii++]; + ptr = (byte *)~w.d; + rdlim = ptr + w.dlen; + Stream::buffer = ptr; + return true; + } + return false; +} + +void ZstdDecompressStream::Fetch() +{ + if(Next()) + return; + if(eof) + return; +#ifdef _MULTITHREADED + CoWork co; +#endif + bool error = false; + bool last = false; + ii = 0; + count = concurrent ? 16 : 1; + int osz = (int)ZSTD_compressBound(BLOCK_BYTES); + for(int i = 0; i < count; i++) { + Workblock& w = wb[i]; + if(in->IsEof()) { // This is EOF + eof = true; + count = i; + break; + } + + if(!w.c) + w.c.Alloc(osz); + if(!w.d || w.irregular_d) { + w.d.Alloc(BLOCK_BYTES); + w.irregular_d = false; + } + + w.lc.Clear(); + + char *t = w.c; + char *te = ~w.c + osz; + + if(in->Get32le() != ZSTD_MAGICNUMBER) { + SetError(); + return; + } + int fhd = in->Get(); + if(fhd < 0) { + SetError(); + return; + } + Poke32le(t, ZSTD_MAGICNUMBER); + t += 4; + *t++ = fhd; + dword dictID= fhd & 3; + dword directMode = (fhd >> 5) & 1; + dword const fcsId = fhd >> 6; + static byte ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 }; + static byte ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 }; + int l = !directMode + ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId] + (directMode && !ZSTD_fcs_fieldSize[fcsId]); + if(in->Get(t, l) != l) { + SetError(); + return; + } + + t += l; + + int64 h = ZSTD_getDecompressedSize(~w.c, t - ~w.c); + if(h > 1024*1024*1024) { + SetError(); + return; + } + + w.dlen = (int)h; + + for(;;) { + int blkhdr = 0; + for(int i = 0; i < 3; i++) { + int b = in->Get(); + if(b < 0) { + SetError(); + return; + } + if(t && t == te) { + w.lc.Cat(~w.c, t); + t = NULL; + } + if(t) + *t++ = b; + else + w.lc.Cat(b); + blkhdr = (blkhdr << 8) | b; + } + + int len = blkhdr & ((1 << 22) - 1); + + blkhdr >>= 22; + + if(blkhdr == 3) { + w.clen = t ? int(t - ~w.c) : w.lc.GetCount(); + break; + } + if(blkhdr == 2) + len = 1; // RLE, just single byte to repeat len times + + if(t && len > te - t) { + w.lc.Cat(~w.c, t); + t = NULL; + } + if(t) { + if(in->Get(t, len) != len) { + SetError(); + return; + } + t += len; + } + else { + String h = in->Get(len); + if(h.GetCount() != len) { + SetError(); + return; + } + w.lc.Cat(h); + } + } + + auto decompress = [=] { + Workblock& w = wb[i]; + if(w.dlen == 0) { // decompressed size is not known + int n = 2*1024*1024; + w.irregular_d = true; + for(;;) { + if(n >= 1024*1024*1024) { + SetError(); + return; + } + w.d.Alloc(n); + size_t len = ZSTD_decompress(~w.d, n, w.lc.GetCount() ? ~w.lc : ~w.c, w.clen); + if(!ZSTD_isError(len)) { + w.dlen = (int)len; + break; + } + n += n; + } + } + else { + if(w.dlen > BLOCK_BYTES) { + w.irregular_d = true; + w.d.Alloc(w.dlen); + } + if(ZSTD_isError(ZSTD_decompress(~w.d, w.dlen, w.lc.GetCount() ? ~w.lc : ~w.c, w.clen))) { + SetError(); + return; + } + } + }; + + if(concurrent) + co & decompress; + else + decompress(); + } +#ifdef _MULTITHREADED + if(concurrent) + co.Finish(); +#endif + if(error) + SetError(); + else + Next(); +} + +bool ZstdDecompressStream::IsOpen() const +{ + return in->IsOpen() && !IsError(); +} + +int ZstdDecompressStream::_Term() +{ + if(eof) + return -1; + Fetch(); + return ptr == rdlim ? -1 : *ptr; +} + +int ZstdDecompressStream::_Get() +{ + if(eof) + return -1; + Fetch(); + return ptr == rdlim ? -1 : *ptr++; +} + +dword ZstdDecompressStream::_Get(void *data, dword size) +{ + byte *t = (byte *)data; + while(size) { + if(IsError() || in->IsError() || ptr == rdlim && ii == count && eof) + break; + dword n = dword(rdlim - ptr); + if(size < n) { + memcpy(t, ptr, size); + t += size; + ptr += size; + break; + } + else { + memcpy(t, ptr, n); + t += n; + size -= n; + ptr = rdlim; + Fetch(); + } + } + + return dword(t - (byte *)data); +} + +ZstdDecompressStream::ZstdDecompressStream() +{ + style = STRM_READ|STRM_LOADING; + in = NULL; + concurrent = false; +} + +ZstdDecompressStream::~ZstdDecompressStream() +{ +} + +bool IsZstd(Stream& s) +{ + int64 pos = s.GetPos(); + bool b = s.Get32le() == 0xFD2FB527; + s.Seek(pos); + return b; +} + +}; diff --git a/uppsrc/plugin/zstd/common/bitstream.h b/uppsrc/plugin/zstd/common/bitstream.h new file mode 100644 index 000000000..e96798fe4 --- /dev/null +++ b/uppsrc/plugin/zstd/common/bitstream.h @@ -0,0 +1,414 @@ +/* ****************************************************************** + bitstream + Part of FSE library + header file (to include) + Copyright (C) 2013-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy +****************************************************************** */ +#ifndef BITSTREAM_H_MODULE +#define BITSTREAM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* +* This API consists of small unitary functions, which must be inlined for best performance. +* Since link-time-optimization is not available for all compilers, +* these functions are defined into a .h to be included. +*/ + +/*-**************************************** +* Dependencies +******************************************/ +#include "mem.h" /* unaligned access routines */ +#include "error_private.h" /* error codes and messages */ + + +/*========================================= +* Target specific +=========================================*/ +#if defined(__BMI__) && defined(__GNUC__) +# include /* support for bextr (experimental) */ +#endif + + +/*-****************************************** +* bitStream encoding API (write forward) +********************************************/ +/* bitStream can mix input from multiple sources. +* A critical property of these streams is that they encode and decode in **reverse** direction. +* So the first bit sequence you add will be the last to be read, like a LIFO stack. +*/ +typedef struct +{ + size_t bitContainer; + int bitPos; + char* startPtr; + char* ptr; + char* endPtr; +} BIT_CStream_t; + +MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, void* dstBuffer, size_t dstCapacity); +MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC, size_t value, unsigned nbBits); +MEM_STATIC void BIT_flushBits(BIT_CStream_t* bitC); +MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC); + +/* Start with initCStream, providing the size of buffer to write into. +* bitStream will never write outside of this buffer. +* `dstCapacity` must be >= sizeof(bitD->bitContainer), otherwise @return will be an error code. +* +* bits are first added to a local register. +* Local register is size_t, hence 64-bits on 64-bits systems, or 32-bits on 32-bits systems. +* Writing data into memory is an explicit operation, performed by the flushBits function. +* Hence keep track how many bits are potentially stored into local register to avoid register overflow. +* After a flushBits, a maximum of 7 bits might still be stored into local register. +* +* Avoid storing elements of more than 24 bits if you want compatibility with 32-bits bitstream readers. +* +* Last operation is to close the bitStream. +* The function returns the final size of CStream in bytes. +* If data couldn't fit into `dstBuffer`, it will return a 0 ( == not storable) +*/ + + +/*-******************************************** +* bitStream decoding API (read backward) +**********************************************/ +typedef struct +{ + size_t bitContainer; + unsigned bitsConsumed; + const char* ptr; + const char* start; +} BIT_DStream_t; + +typedef enum { BIT_DStream_unfinished = 0, + BIT_DStream_endOfBuffer = 1, + BIT_DStream_completed = 2, + BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */ + /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ + +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize); +MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits); +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD); +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD); + + +/* Start by invoking BIT_initDStream(). +* A chunk of the bitStream is then stored into a local register. +* Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t). +* You can then retrieve bitFields stored into the local register, **in reverse order**. +* Local register is explicitly reloaded from memory by the BIT_reloadDStream() method. +* A reload guarantee a minimum of ((8*sizeof(bitD->bitContainer))-7) bits when its result is BIT_DStream_unfinished. +* Otherwise, it can be less than that, so proceed accordingly. +* Checking if DStream has reached its end can be performed with BIT_endOfDStream(). +*/ + + +/*-**************************************** +* unsafe API +******************************************/ +MEM_STATIC void BIT_addBitsFast(BIT_CStream_t* bitC, size_t value, unsigned nbBits); +/* faster, but works only if value is "clean", meaning all high bits above nbBits are 0 */ + +MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC); +/* unsafe version; does not check buffer overflow */ + +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits); +/* faster, but works only if nbBits >= 1 */ + + + +/*-************************************************************** +* Internal functions +****************************************************************/ +MEM_STATIC unsigned BIT_highbit32 (register U32 val) +{ +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + _BitScanReverse ( &r, val ); + return (unsigned) r; +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ + return 31 - __builtin_clz (val); +# else /* Software version */ + static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + return DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; +# endif +} + +/*===== Local Constants =====*/ +static const unsigned BIT_mask[] = { 0, 1, 3, 7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0x1FFFF, 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF, 0x7FFFFF, 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF }; /* up to 26 bits */ + + +/*-************************************************************** +* bitStream encoding +****************************************************************/ +/*! BIT_initCStream() : + * `dstCapacity` must be > sizeof(void*) + * @return : 0 if success, + otherwise an error code (can be tested using ERR_isError() ) */ +MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, void* startPtr, size_t dstCapacity) +{ + bitC->bitContainer = 0; + bitC->bitPos = 0; + bitC->startPtr = (char*)startPtr; + bitC->ptr = bitC->startPtr; + bitC->endPtr = bitC->startPtr + dstCapacity - sizeof(bitC->ptr); + if (dstCapacity <= sizeof(bitC->ptr)) return ERROR(dstSize_tooSmall); + return 0; +} + +/*! BIT_addBits() : + can add up to 26 bits into `bitC`. + Does not check for register overflow ! */ +MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC, size_t value, unsigned nbBits) +{ + bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos; + bitC->bitPos += nbBits; +} + +/*! BIT_addBitsFast() : + * works only if `value` is _clean_, meaning all high bits above nbBits are 0 */ +MEM_STATIC void BIT_addBitsFast(BIT_CStream_t* bitC, size_t value, unsigned nbBits) +{ + bitC->bitContainer |= value << bitC->bitPos; + bitC->bitPos += nbBits; +} + +/*! BIT_flushBitsFast() : + * unsafe version; does not check buffer overflow */ +MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC) +{ + size_t const nbBytes = bitC->bitPos >> 3; + MEM_writeLEST(bitC->ptr, bitC->bitContainer); + bitC->ptr += nbBytes; + bitC->bitPos &= 7; + bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */ +} + +/*! BIT_flushBits() : + * safe version; check for buffer overflow, and prevents it. + * note : does not signal buffer overflow. This will be revealed later on using BIT_closeCStream() */ +MEM_STATIC void BIT_flushBits(BIT_CStream_t* bitC) +{ + size_t const nbBytes = bitC->bitPos >> 3; + MEM_writeLEST(bitC->ptr, bitC->bitContainer); + bitC->ptr += nbBytes; + if (bitC->ptr > bitC->endPtr) bitC->ptr = bitC->endPtr; + bitC->bitPos &= 7; + bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */ +} + +/*! BIT_closeCStream() : + * @return : size of CStream, in bytes, + or 0 if it could not fit into dstBuffer */ +MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC) +{ + BIT_addBitsFast(bitC, 1, 1); /* endMark */ + BIT_flushBits(bitC); + + if (bitC->ptr >= bitC->endPtr) return 0; /* doesn't fit within authorized budget : cancel */ + + return (bitC->ptr - bitC->startPtr) + (bitC->bitPos > 0); +} + + +/*-******************************************************** +* bitStream decoding +**********************************************************/ +/*! BIT_initDStream() : +* Initialize a BIT_DStream_t. +* `bitD` : a pointer to an already allocated BIT_DStream_t structure. +* `srcSize` must be the *exact* size of the bitStream, in bytes. +* @return : size of stream (== srcSize) or an errorCode if a problem is detected +*/ +MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize) +{ + if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } + + if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */ + bitD->start = (const char*)srcBuffer; + bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer); + bitD->bitContainer = MEM_readLEST(bitD->ptr); + { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; + bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; + if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ } + } else { + bitD->start = (const char*)srcBuffer; + bitD->ptr = bitD->start; + bitD->bitContainer = *(const BYTE*)(bitD->start); + switch(srcSize) + { + case 7: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[6]) << (sizeof(bitD->bitContainer)*8 - 16); + case 6: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[5]) << (sizeof(bitD->bitContainer)*8 - 24); + case 5: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[4]) << (sizeof(bitD->bitContainer)*8 - 32); + case 4: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[3]) << 24; + case 3: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[2]) << 16; + case 2: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[1]) << 8; + default:; + } + { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; + bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; + if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ } + bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize)*8; + } + + return srcSize; +} + +MEM_STATIC size_t BIT_getUpperBits(size_t bitContainer, U32 const start) +{ + return bitContainer >> start; +} + +MEM_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits) +{ +#if defined(__BMI__) && defined(__GNUC__) /* experimental */ +# if defined(__x86_64__) + if (sizeof(bitContainer)==8) + return _bextr_u64(bitContainer, start, nbBits); + else +# endif + return _bextr_u32(bitContainer, start, nbBits); +#else + return (bitContainer >> start) & BIT_mask[nbBits]; +#endif +} + +MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits) +{ + return bitContainer & BIT_mask[nbBits]; +} + +/*! BIT_lookBits() : + * Provides next n bits from local register. + * local register is not modified. + * On 32-bits, maxNbBits==24. + * On 64-bits, maxNbBits==56. + * @return : value extracted + */ + MEM_STATIC size_t BIT_lookBits(const BIT_DStream_t* bitD, U32 nbBits) +{ +#if defined(__BMI__) && defined(__GNUC__) /* experimental; fails if bitD->bitsConsumed + nbBits > sizeof(bitD->bitContainer)*8 */ + return BIT_getMiddleBits(bitD->bitContainer, (sizeof(bitD->bitContainer)*8) - bitD->bitsConsumed - nbBits, nbBits); +#else + U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1; + return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); +#endif +} + +/*! BIT_lookBitsFast() : +* unsafe version; only works only if nbBits >= 1 */ +MEM_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t* bitD, U32 nbBits) +{ + U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1; + return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); +} + +MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits) +{ + bitD->bitsConsumed += nbBits; +} + +/*! BIT_readBits() : + * Read (consume) next n bits from local register and update. + * Pay attention to not read more than nbBits contained into local register. + * @return : extracted value. + */ +MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits) +{ + size_t const value = BIT_lookBits(bitD, nbBits); + BIT_skipBits(bitD, nbBits); + return value; +} + +/*! BIT_readBitsFast() : +* unsafe version; only works only if nbBits >= 1 */ +MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits) +{ + size_t const value = BIT_lookBitsFast(bitD, nbBits); + BIT_skipBits(bitD, nbBits); + return value; +} + +/*! BIT_reloadDStream() : +* Refill `BIT_DStream_t` from src buffer previously defined (see BIT_initDStream() ). +* This function is safe, it guarantees it will not read beyond src buffer. +* @return : status of `BIT_DStream_t` internal register. + if status == unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */ +MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD) +{ + if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should not happen => corruption detected */ + return BIT_DStream_overflow; + + if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) { + bitD->ptr -= bitD->bitsConsumed >> 3; + bitD->bitsConsumed &= 7; + bitD->bitContainer = MEM_readLEST(bitD->ptr); + return BIT_DStream_unfinished; + } + if (bitD->ptr == bitD->start) { + if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer; + return BIT_DStream_completed; + } + { U32 nbBytes = bitD->bitsConsumed >> 3; + BIT_DStream_status result = BIT_DStream_unfinished; + if (bitD->ptr - nbBytes < bitD->start) { + nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ + result = BIT_DStream_endOfBuffer; + } + bitD->ptr -= nbBytes; + bitD->bitsConsumed -= nbBytes*8; + bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ + return result; + } +} + +/*! BIT_endOfDStream() : +* @return Tells if DStream has exactly reached its end (all bits consumed). +*/ +MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream) +{ + return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* BITSTREAM_H_MODULE */ diff --git a/uppsrc/plugin/zstd/common/entropy_common.c b/uppsrc/plugin/zstd/common/entropy_common.c new file mode 100644 index 000000000..b42acb4a3 --- /dev/null +++ b/uppsrc/plugin/zstd/common/entropy_common.c @@ -0,0 +1,231 @@ +/* + Common functions of New Generation Entropy library + Copyright (C) 2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +*************************************************************************** */ + +/* ************************************* +* Dependencies +***************************************/ +#include "mem.h" +#include "error_private.h" /* ERR_*, ERROR */ +#define FSE_STATIC_LINKING_ONLY /* FSE_MIN_TABLELOG */ +#include "fse.h" /* FSE_isError, FSE_getErrorName */ +#define HUF_STATIC_LINKING_ONLY /* HUF_TABLELOG_ABSOLUTEMAX */ +#include "huf.h" /* HUF_isError, HUF_getErrorName */ + + + +/*-**************************************** +* FSE Error Management +******************************************/ +unsigned FSE_isError(size_t code) { return ERR_isError(code); } + +const char* FSE_getErrorName(size_t code) { return ERR_getErrorName(code); } + + +/* ************************************************************** +* HUF Error Management +****************************************************************/ +unsigned HUF_isError(size_t code) { return ERR_isError(code); } + +const char* HUF_getErrorName(size_t code) { return ERR_getErrorName(code); } + + +/*-************************************************************** +* FSE NCount encoding-decoding +****************************************************************/ +static short FSE_abs(short a) { return a<0 ? -a : a; } + +size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, + const void* headerBuffer, size_t hbSize) +{ + const BYTE* const istart = (const BYTE*) headerBuffer; + const BYTE* const iend = istart + hbSize; + const BYTE* ip = istart; + int nbBits; + int remaining; + int threshold; + U32 bitStream; + int bitCount; + unsigned charnum = 0; + int previous0 = 0; + + if (hbSize < 4) return ERROR(srcSize_wrong); + bitStream = MEM_readLE32(ip); + nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */ + if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); + bitStream >>= 4; + bitCount = 4; + *tableLogPtr = nbBits; + remaining = (1<1) && (charnum<=*maxSVPtr)) { + if (previous0) { + unsigned n0 = charnum; + while ((bitStream & 0xFFFF) == 0xFFFF) { + n0+=24; + if (ip < iend-5) { + ip+=2; + bitStream = MEM_readLE32(ip) >> bitCount; + } else { + bitStream >>= 16; + bitCount+=16; + } } + while ((bitStream & 3) == 3) { + n0+=3; + bitStream>>=2; + bitCount+=2; + } + n0 += bitStream & 3; + bitCount += 2; + if (n0 > *maxSVPtr) return ERROR(maxSymbolValue_tooSmall); + while (charnum < n0) normalizedCounter[charnum++] = 0; + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { + ip += bitCount>>3; + bitCount &= 7; + bitStream = MEM_readLE32(ip) >> bitCount; + } + else + bitStream >>= 2; + } + { short const max = (short)((2*threshold-1)-remaining); + short count; + + if ((bitStream & (threshold-1)) < (U32)max) { + count = (short)(bitStream & (threshold-1)); + bitCount += nbBits-1; + } else { + count = (short)(bitStream & (2*threshold-1)); + if (count >= threshold) count -= max; + bitCount += nbBits; + } + + count--; /* extra accuracy */ + remaining -= FSE_abs(count); + normalizedCounter[charnum++] = count; + previous0 = !count; + while (remaining < threshold) { + nbBits--; + threshold >>= 1; + } + + if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { + ip += bitCount>>3; + bitCount &= 7; + } else { + bitCount -= (int)(8 * (iend - 4 - ip)); + ip = iend - 4; + } + bitStream = MEM_readLE32(ip) >> (bitCount & 31); + } } /* while ((remaining>1) && (charnum<=*maxSVPtr)) */ + if (remaining != 1) return ERROR(GENERIC); + *maxSVPtr = charnum-1; + + ip += (bitCount+7)>>3; + if ((size_t)(ip-istart) > hbSize) return ERROR(srcSize_wrong); + return ip-istart; +} + + +/*! HUF_readStats() : + Read compact Huffman tree, saved by HUF_writeCTable(). + `huffWeight` is destination buffer. + @return : size read from `src` , or an error Code . + Note : Needed by HUF_readCTable() and HUF_readDTableXn() . +*/ +size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize) +{ + U32 weightTotal; + const BYTE* ip = (const BYTE*) src; + size_t iSize = ip[0]; + size_t oSize; + + //memset(huffWeight, 0, hwSize); /* is not necessary, even though some analyzer complain ... */ + + if (iSize >= 128) { /* special header */ + if (iSize >= (242)) { /* RLE */ + static U32 l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; + oSize = l[iSize-242]; + memset(huffWeight, 1, hwSize); + iSize = 0; + } + else { /* Incompressible */ + oSize = iSize - 127; + iSize = ((oSize+1)/2); + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + if (oSize >= hwSize) return ERROR(corruption_detected); + ip += 1; + { U32 n; + for (n=0; n> 4; + huffWeight[n+1] = ip[n/2] & 15; + } } } } + else { /* header compressed with FSE (normal case) */ + if (iSize+1 > srcSize) return ERROR(srcSize_wrong); + oSize = FSE_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */ + if (FSE_isError(oSize)) return oSize; + } + + /* collect weight stats */ + memset(rankStats, 0, (HUF_TABLELOG_ABSOLUTEMAX + 1) * sizeof(U32)); + weightTotal = 0; + { U32 n; for (n=0; n= HUF_TABLELOG_ABSOLUTEMAX) return ERROR(corruption_detected); + rankStats[huffWeight[n]]++; + weightTotal += (1 << huffWeight[n]) >> 1; + } } + + /* get last non-null symbol weight (implied, total must be 2^n) */ + { U32 const tableLog = BIT_highbit32(weightTotal) + 1; + if (tableLog > HUF_TABLELOG_ABSOLUTEMAX) return ERROR(corruption_detected); + *tableLogPtr = tableLog; + /* determine last weight */ + { U32 const total = 1 << tableLog; + U32 const rest = total - weightTotal; + U32 const verif = 1 << BIT_highbit32(rest); + U32 const lastWeight = BIT_highbit32(rest) + 1; + if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ + huffWeight[oSize] = (BYTE)lastWeight; + rankStats[lastWeight]++; + } } + + /* check tree construction validity */ + if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ + + /* results */ + *nbSymbolsPtr = (U32)(oSize+1); + return iSize+1; +} diff --git a/uppsrc/plugin/zstd/common/error_private.h b/uppsrc/plugin/zstd/common/error_private.h new file mode 100644 index 000000000..889061496 --- /dev/null +++ b/uppsrc/plugin/zstd/common/error_private.h @@ -0,0 +1,125 @@ +/* ****************************************************************** + Error codes and messages + Copyright (C) 2013-2016, Yann Collet + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Homepage : http://www.zstd.net +****************************************************************** */ +/* Note : this module is expected to remain private, do not expose it */ + +#ifndef ERROR_H_MODULE +#define ERROR_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* **************************************** +* Dependencies +******************************************/ +#include /* size_t */ +#include "error_public.h" /* enum list */ + + +/* **************************************** +* Compiler-specific +******************************************/ +#if defined(__GNUC__) +# define ERR_STATIC static __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define ERR_STATIC static inline +#elif defined(_MSC_VER) +# define ERR_STATIC static __inline +#else +# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/*-**************************************** +* Customization (error_public.h) +******************************************/ +typedef ZSTD_ErrorCode ERR_enum; +#define PREFIX(name) ZSTD_error_##name + + +/*-**************************************** +* Error codes handling +******************************************/ +#ifdef ERROR +# undef ERROR /* reported already defined on VS 2015 (Rich Geldreich) */ +#endif +#define ERROR(name) ((size_t)-PREFIX(name)) + +ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); } + +ERR_STATIC ERR_enum ERR_getErrorCode(size_t code) { if (!ERR_isError(code)) return (ERR_enum)0; return (ERR_enum) (0-code); } + + +/*-**************************************** +* Error Strings +******************************************/ + +ERR_STATIC const char* ERR_getErrorString(ERR_enum code) +{ + static const char* notErrorCode = "Unspecified error code"; + switch( code ) + { + case PREFIX(no_error): return "No error detected"; + case PREFIX(GENERIC): return "Error (generic)"; + case PREFIX(prefix_unknown): return "Unknown frame descriptor"; + case PREFIX(frameParameter_unsupported): return "Unsupported frame parameter"; + case PREFIX(frameParameter_unsupportedBy32bits): return "Frame parameter unsupported in 32-bits mode"; + case PREFIX(compressionParameter_unsupported): return "Compression parameter is out of bound"; + case PREFIX(init_missing): return "Context should be init first"; + case PREFIX(memory_allocation): return "Allocation error : not enough memory"; + case PREFIX(stage_wrong): return "Operation not authorized at current processing stage"; + case PREFIX(dstSize_tooSmall): return "Destination buffer is too small"; + case PREFIX(srcSize_wrong): return "Src size incorrect"; + case PREFIX(corruption_detected): return "Corrupted block detected"; + case PREFIX(checksum_wrong): return "Restored data doesn't match checksum"; + case PREFIX(tableLog_tooLarge): return "tableLog requires too much memory : unsupported"; + case PREFIX(maxSymbolValue_tooLarge): return "Unsupported max Symbol Value : too large"; + case PREFIX(maxSymbolValue_tooSmall): return "Specified maxSymbolValue is too small"; + case PREFIX(dictionary_corrupted): return "Dictionary is corrupted"; + case PREFIX(dictionary_wrong): return "Dictionary mismatch"; + case PREFIX(maxCode): + default: return notErrorCode; + } +} + +ERR_STATIC const char* ERR_getErrorName(size_t code) +{ + return ERR_getErrorString(ERR_getErrorCode(code)); +} + +#if defined (__cplusplus) +} +#endif + +#endif /* ERROR_H_MODULE */ diff --git a/uppsrc/plugin/zstd/common/error_public.h b/uppsrc/plugin/zstd/common/error_public.h new file mode 100644 index 000000000..29050b3b3 --- /dev/null +++ b/uppsrc/plugin/zstd/common/error_public.h @@ -0,0 +1,77 @@ +/* ****************************************************************** + Error codes list + Copyright (C) 2016, Yann Collet + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Homepage : http://www.zstd.net +****************************************************************** */ +#ifndef ERROR_PUBLIC_H_MODULE +#define ERROR_PUBLIC_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* **************************************** +* error codes list +******************************************/ +typedef enum { + ZSTD_error_no_error, + ZSTD_error_GENERIC, + ZSTD_error_prefix_unknown, + ZSTD_error_frameParameter_unsupported, + ZSTD_error_frameParameter_unsupportedBy32bits, + ZSTD_error_compressionParameter_unsupported, + ZSTD_error_init_missing, + ZSTD_error_memory_allocation, + ZSTD_error_stage_wrong, + ZSTD_error_dstSize_tooSmall, + ZSTD_error_srcSize_wrong, + ZSTD_error_corruption_detected, + ZSTD_error_checksum_wrong, + ZSTD_error_tableLog_tooLarge, + ZSTD_error_maxSymbolValue_tooLarge, + ZSTD_error_maxSymbolValue_tooSmall, + ZSTD_error_dictionary_corrupted, + ZSTD_error_dictionary_wrong, + ZSTD_error_maxCode +} ZSTD_ErrorCode; + +/*! ZSTD_getErrorCode() : + convert a `size_t` function result into a `ZSTD_ErrorCode` enum type, + which can be used to compare directly with enum list published into "error_public.h" */ +ZSTD_ErrorCode ZSTD_getErrorCode(size_t functionResult); +const char* ZSTD_getErrorString(ZSTD_ErrorCode code); + + +#if defined (__cplusplus) +} +#endif + +#endif /* ERROR_PUBLIC_H_MODULE */ diff --git a/uppsrc/plugin/zstd/common/fse.h b/uppsrc/plugin/zstd/common/fse.h new file mode 100644 index 000000000..e711d0135 --- /dev/null +++ b/uppsrc/plugin/zstd/common/fse.h @@ -0,0 +1,628 @@ +/* ****************************************************************** + FSE : Finite State Entropy codec + Public Prototypes declaration + Copyright (C) 2013-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy +****************************************************************** */ +#ifndef FSE_H +#define FSE_H + +#if defined (__cplusplus) +extern "C" { +#endif + + +/*-***************************************** +* Dependencies +******************************************/ +#include /* size_t, ptrdiff_t */ + + +/*-**************************************** +* FSE simple functions +******************************************/ +/*! FSE_compress() : + Compress content of buffer 'src', of size 'srcSize', into destination buffer 'dst'. + 'dst' buffer must be already allocated. Compression runs faster is dstCapacity >= FSE_compressBound(srcSize). + @return : size of compressed data (<= dstCapacity). + Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!! + if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression instead. + if FSE_isError(return), compression failed (more details using FSE_getErrorName()) +*/ +size_t FSE_compress(void* dst, size_t dstCapacity, + const void* src, size_t srcSize); + +/*! FSE_decompress(): + Decompress FSE data from buffer 'cSrc', of size 'cSrcSize', + into already allocated destination buffer 'dst', of size 'dstCapacity'. + @return : size of regenerated data (<= maxDstSize), + or an error code, which can be tested using FSE_isError() . + + ** Important ** : FSE_decompress() does not decompress non-compressible nor RLE data !!! + Why ? : making this distinction requires a header. + Header management is intentionally delegated to the user layer, which can better manage special cases. +*/ +size_t FSE_decompress(void* dst, size_t dstCapacity, + const void* cSrc, size_t cSrcSize); + + +/*-***************************************** +* Tool functions +******************************************/ +size_t FSE_compressBound(size_t size); /* maximum compressed size */ + +/* Error Management */ +unsigned FSE_isError(size_t code); /* tells if a return value is an error code */ +const char* FSE_getErrorName(size_t code); /* provides error code string (useful for debugging) */ + + +/*-***************************************** +* FSE advanced functions +******************************************/ +/*! FSE_compress2() : + Same as FSE_compress(), but allows the selection of 'maxSymbolValue' and 'tableLog' + Both parameters can be defined as '0' to mean : use default value + @return : size of compressed data + Special values : if return == 0, srcData is not compressible => Nothing is stored within cSrc !!! + if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression. + if FSE_isError(return), it's an error code. +*/ +size_t FSE_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); + + +/*-***************************************** +* FSE detailed API +******************************************/ +/*! +FSE_compress() does the following: +1. count symbol occurrence from source[] into table count[] +2. normalize counters so that sum(count[]) == Power_of_2 (2^tableLog) +3. save normalized counters to memory buffer using writeNCount() +4. build encoding table 'CTable' from normalized counters +5. encode the data stream using encoding table 'CTable' + +FSE_decompress() does the following: +1. read normalized counters with readNCount() +2. build decoding table 'DTable' from normalized counters +3. decode the data stream using decoding table 'DTable' + +The following API allows targeting specific sub-functions for advanced tasks. +For example, it's possible to compress several blocks using the same 'CTable', +or to save and provide normalized distribution using external method. +*/ + +/* *** COMPRESSION *** */ + +/*! FSE_count(): + Provides the precise count of each byte within a table 'count'. + 'count' is a table of unsigned int, of minimum size (*maxSymbolValuePtr+1). + *maxSymbolValuePtr will be updated if detected smaller than initial value. + @return : the count of the most frequent symbol (which is not identified). + if return == srcSize, there is only one symbol. + Can also return an error code, which can be tested with FSE_isError(). */ +size_t FSE_count(unsigned* count, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize); + +/*! FSE_optimalTableLog(): + dynamically downsize 'tableLog' when conditions are met. + It saves CPU time, by using smaller tables, while preserving or even improving compression ratio. + @return : recommended tableLog (necessarily <= 'maxTableLog') */ +unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); + +/*! FSE_normalizeCount(): + normalize counts so that sum(count[]) == Power_of_2 (2^tableLog) + 'normalizedCounter' is a table of short, of minimum size (maxSymbolValue+1). + @return : tableLog, + or an errorCode, which can be tested using FSE_isError() */ +size_t FSE_normalizeCount(short* normalizedCounter, unsigned tableLog, const unsigned* count, size_t srcSize, unsigned maxSymbolValue); + +/*! FSE_NCountWriteBound(): + Provides the maximum possible size of an FSE normalized table, given 'maxSymbolValue' and 'tableLog'. + Typically useful for allocation purpose. */ +size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_writeNCount(): + Compactly save 'normalizedCounter' into 'buffer'. + @return : size of the compressed table, + or an errorCode, which can be tested using FSE_isError(). */ +size_t FSE_writeNCount (void* buffer, size_t bufferSize, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); + + +/*! Constructor and Destructor of FSE_CTable. + Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */ +typedef unsigned FSE_CTable; /* don't allocate that. It's only meant to be more restrictive than void* */ +FSE_CTable* FSE_createCTable (unsigned tableLog, unsigned maxSymbolValue); +void FSE_freeCTable (FSE_CTable* ct); + +/*! FSE_buildCTable(): + Builds `ct`, which must be already allocated, using FSE_createCTable(). + @return : 0, or an errorCode, which can be tested using FSE_isError() */ +size_t FSE_buildCTable(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_compress_usingCTable(): + Compress `src` using `ct` into `dst` which must be already allocated. + @return : size of compressed data (<= `dstCapacity`), + or 0 if compressed data could not fit into `dst`, + or an errorCode, which can be tested using FSE_isError() */ +size_t FSE_compress_usingCTable (void* dst, size_t dstCapacity, const void* src, size_t srcSize, const FSE_CTable* ct); + +/*! +Tutorial : +---------- +The first step is to count all symbols. FSE_count() does this job very fast. +Result will be saved into 'count', a table of unsigned int, which must be already allocated, and have 'maxSymbolValuePtr[0]+1' cells. +'src' is a table of bytes of size 'srcSize'. All values within 'src' MUST be <= maxSymbolValuePtr[0] +maxSymbolValuePtr[0] will be updated, with its real value (necessarily <= original value) +FSE_count() will return the number of occurrence of the most frequent symbol. +This can be used to know if there is a single symbol within 'src', and to quickly evaluate its compressibility. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). + +The next step is to normalize the frequencies. +FSE_normalizeCount() will ensure that sum of frequencies is == 2 ^'tableLog'. +It also guarantees a minimum of 1 to any Symbol with frequency >= 1. +You can use 'tableLog'==0 to mean "use default tableLog value". +If you are unsure of which tableLog value to use, you can ask FSE_optimalTableLog(), +which will provide the optimal valid tableLog given sourceSize, maxSymbolValue, and a user-defined maximum (0 means "default"). + +The result of FSE_normalizeCount() will be saved into a table, +called 'normalizedCounter', which is a table of signed short. +'normalizedCounter' must be already allocated, and have at least 'maxSymbolValue+1' cells. +The return value is tableLog if everything proceeded as expected. +It is 0 if there is a single symbol within distribution. +If there is an error (ex: invalid tableLog value), the function will return an ErrorCode (which can be tested using FSE_isError()). + +'normalizedCounter' can be saved in a compact manner to a memory area using FSE_writeNCount(). +'buffer' must be already allocated. +For guaranteed success, buffer size must be at least FSE_headerBound(). +The result of the function is the number of bytes written into 'buffer'. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError(); ex : buffer size too small). + +'normalizedCounter' can then be used to create the compression table 'CTable'. +The space required by 'CTable' must be already allocated, using FSE_createCTable(). +You can then use FSE_buildCTable() to fill 'CTable'. +If there is an error, both functions will return an ErrorCode (which can be tested using FSE_isError()). + +'CTable' can then be used to compress 'src', with FSE_compress_usingCTable(). +Similar to FSE_count(), the convention is that 'src' is assumed to be a table of char of size 'srcSize' +The function returns the size of compressed data (without header), necessarily <= `dstCapacity`. +If it returns '0', compressed data could not fit into 'dst'. +If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()). +*/ + + +/* *** DECOMPRESSION *** */ + +/*! FSE_readNCount(): + Read compactly saved 'normalizedCounter' from 'rBuffer'. + @return : size read from 'rBuffer', + or an errorCode, which can be tested using FSE_isError(). + maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */ +size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSymbolValuePtr, unsigned* tableLogPtr, const void* rBuffer, size_t rBuffSize); + +/*! Constructor and Destructor of FSE_DTable. + Note that its size depends on 'tableLog' */ +typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ +FSE_DTable* FSE_createDTable(unsigned tableLog); +void FSE_freeDTable(FSE_DTable* dt); + +/*! FSE_buildDTable(): + Builds 'dt', which must be already allocated, using FSE_createDTable(). + return : 0, or an errorCode, which can be tested using FSE_isError() */ +size_t FSE_buildDTable (FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); + +/*! FSE_decompress_usingDTable(): + Decompress compressed source `cSrc` of size `cSrcSize` using `dt` + into `dst` which must be already allocated. + @return : size of regenerated data (necessarily <= `dstCapacity`), + or an errorCode, which can be tested using FSE_isError() */ +size_t FSE_decompress_usingDTable(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, const FSE_DTable* dt); + +/*! +Tutorial : +---------- +(Note : these functions only decompress FSE-compressed blocks. + If block is uncompressed, use memcpy() instead + If block is a single repeated byte, use memset() instead ) + +The first step is to obtain the normalized frequencies of symbols. +This can be performed by FSE_readNCount() if it was saved using FSE_writeNCount(). +'normalizedCounter' must be already allocated, and have at least 'maxSymbolValuePtr[0]+1' cells of signed short. +In practice, that means it's necessary to know 'maxSymbolValue' beforehand, +or size the table to handle worst case situations (typically 256). +FSE_readNCount() will provide 'tableLog' and 'maxSymbolValue'. +The result of FSE_readNCount() is the number of bytes read from 'rBuffer'. +Note that 'rBufferSize' must be at least 4 bytes, even if useful information is less than that. +If there is an error, the function will return an error code, which can be tested using FSE_isError(). + +The next step is to build the decompression tables 'FSE_DTable' from 'normalizedCounter'. +This is performed by the function FSE_buildDTable(). +The space required by 'FSE_DTable' must be already allocated using FSE_createDTable(). +If there is an error, the function will return an error code, which can be tested using FSE_isError(). + +`FSE_DTable` can then be used to decompress `cSrc`, with FSE_decompress_usingDTable(). +`cSrcSize` must be strictly correct, otherwise decompression will fail. +FSE_decompress_usingDTable() result will tell how many bytes were regenerated (<=`dstCapacity`). +If there is an error, the function will return an error code, which can be tested using FSE_isError(). (ex: dst buffer too small) +*/ + + +#ifdef FSE_STATIC_LINKING_ONLY + +/* *** Dependency *** */ +#include "bitstream.h" + + +/* ***************************************** +* Static allocation +*******************************************/ +/* FSE buffer bounds */ +#define FSE_NCOUNTBOUND 512 +#define FSE_BLOCKBOUND(size) (size + (size>>7)) +#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* It is possible to statically allocate FSE CTable/DTable as a table of unsigned using below macros */ +#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<(maxTableLog-1)) + ((maxSymbolValue+1)*2)) +#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<= BIT_DStream_completed + +When it's done, verify decompression is fully completed, by checking both DStream and the relevant states. +Checking if DStream has reached its end is performed by : + BIT_endOfDStream(&DStream); +Check also the states. There might be some symbols left there, if some high probability ones (>50%) are possible. + FSE_endOfDState(&DState); +*/ + + +/* ***************************************** +* FSE unsafe API +*******************************************/ +static unsigned char FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD); +/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */ + + +/* ***************************************** +* Implementation of inlined functions +*******************************************/ +typedef struct { + int deltaFindState; + U32 deltaNbBits; +} FSE_symbolCompressionTransform; /* total 8 bytes */ + +MEM_STATIC void FSE_initCState(FSE_CState_t* statePtr, const FSE_CTable* ct) +{ + const void* ptr = ct; + const U16* u16ptr = (const U16*) ptr; + const U32 tableLog = MEM_read16(ptr); + statePtr->value = (ptrdiff_t)1<stateTable = u16ptr+2; + statePtr->symbolTT = ((const U32*)ct + 1 + (tableLog ? (1<<(tableLog-1)) : 1)); + statePtr->stateLog = tableLog; +} + + +/*! FSE_initCState2() : +* Same as FSE_initCState(), but the first symbol to include (which will be the last to be read) +* uses the smallest state value possible, saving the cost of this symbol */ +MEM_STATIC void FSE_initCState2(FSE_CState_t* statePtr, const FSE_CTable* ct, U32 symbol) +{ + FSE_initCState(statePtr, ct); + { const FSE_symbolCompressionTransform symbolTT = ((const FSE_symbolCompressionTransform*)(statePtr->symbolTT))[symbol]; + const U16* stateTable = (const U16*)(statePtr->stateTable); + U32 nbBitsOut = (U32)((symbolTT.deltaNbBits + (1<<15)) >> 16); + statePtr->value = (nbBitsOut << 16) - symbolTT.deltaNbBits; + statePtr->value = stateTable[(statePtr->value >> nbBitsOut) + symbolTT.deltaFindState]; + } +} + +MEM_STATIC void FSE_encodeSymbol(BIT_CStream_t* bitC, FSE_CState_t* statePtr, U32 symbol) +{ + const FSE_symbolCompressionTransform symbolTT = ((const FSE_symbolCompressionTransform*)(statePtr->symbolTT))[symbol]; + const U16* const stateTable = (const U16*)(statePtr->stateTable); + U32 nbBitsOut = (U32)((statePtr->value + symbolTT.deltaNbBits) >> 16); + BIT_addBits(bitC, statePtr->value, nbBitsOut); + statePtr->value = stateTable[ (statePtr->value >> nbBitsOut) + symbolTT.deltaFindState]; +} + +MEM_STATIC void FSE_flushCState(BIT_CStream_t* bitC, const FSE_CState_t* statePtr) +{ + BIT_addBits(bitC, statePtr->value, statePtr->stateLog); + BIT_flushBits(bitC); +} + +/*<===== Decompression =====>*/ + +typedef struct { + U16 tableLog; + U16 fastMode; +} FSE_DTableHeader; /* sizeof U32 */ + +typedef struct +{ + unsigned short newState; + unsigned char symbol; + unsigned char nbBits; +} FSE_decode_t; /* size == U32 */ + +MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt) +{ + const void* ptr = dt; + const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr; + DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog); + BIT_reloadDStream(bitD); + DStatePtr->table = dt + 1; +} + +MEM_STATIC BYTE FSE_peekSymbol(const FSE_DState_t* DStatePtr) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + return DInfo.symbol; +} + +MEM_STATIC void FSE_updateState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + size_t const lowBits = BIT_readBits(bitD, nbBits); + DStatePtr->state = DInfo.newState + lowBits; +} + +MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + BYTE const symbol = DInfo.symbol; + size_t const lowBits = BIT_readBits(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +/*! FSE_decodeSymbolFast() : + unsafe, only works if no symbol has a probability > 50% */ +MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) +{ + FSE_decode_t const DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; + U32 const nbBits = DInfo.nbBits; + BYTE const symbol = DInfo.symbol; + size_t const lowBits = BIT_readBitsFast(bitD, nbBits); + + DStatePtr->state = DInfo.newState + lowBits; + return symbol; +} + +MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr) +{ + return DStatePtr->state == 0; +} + + + +#ifndef FSE_COMMONDEFS_ONLY + +/* ************************************************************** +* Tuning parameters +****************************************************************/ +/*!MEMORY_USAGE : +* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +* Increasing memory usage improves compression ratio +* Reduced memory usage can improve speed, due to cache effect +* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ +#define FSE_MAX_MEMORY_USAGE 14 +#define FSE_DEFAULT_MEMORY_USAGE 13 + +/*!FSE_MAX_SYMBOL_VALUE : +* Maximum symbol value authorized. +* Required for proper stack allocation */ +#define FSE_MAX_SYMBOL_VALUE 255 + + +/* ************************************************************** +* template functions type & suffix +****************************************************************/ +#define FSE_FUNCTION_TYPE BYTE +#define FSE_FUNCTION_EXTENSION +#define FSE_DECODE_TYPE FSE_decode_t + + +#endif /* !FSE_COMMONDEFS_ONLY */ + + +/* *************************************************************** +* Constants +*****************************************************************/ +#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2) +#define FSE_MAX_TABLESIZE (1U< FSE_TABLELOG_ABSOLUTE_MAX +# error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported" +#endif + +#define FSE_TABLESTEP(tableSize) ((tableSize>>1) + (tableSize>>3) + 3) + + +#endif /* FSE_STATIC_LINKING_ONLY */ + + +#if defined (__cplusplus) +} +#endif + +#endif /* FSE_H */ diff --git a/uppsrc/plugin/zstd/common/fse_decompress.c b/uppsrc/plugin/zstd/common/fse_decompress.c new file mode 100644 index 000000000..918de64c5 --- /dev/null +++ b/uppsrc/plugin/zstd/common/fse_decompress.c @@ -0,0 +1,331 @@ +/* ****************************************************************** + FSE : Finite State Entropy decoder + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + + +/* ************************************************************** +* Compiler specifics +****************************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ +#else +# ifdef __GNUC__ +# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/* ************************************************************** +* Includes +****************************************************************/ +#include /* malloc, free, qsort */ +#include /* memcpy, memset */ +#include /* printf (debug) */ +#include "bitstream.h" +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define FSE_isError ERR_isError +#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/* ************************************************************** +* Complex types +****************************************************************/ +typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)]; + + +/* ************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + +/* Function templates */ +FSE_DTable* FSE_createDTable (unsigned tableLog) +{ + if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX; + return (FSE_DTable*)malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) ); +} + +void FSE_freeDTable (FSE_DTable* dt) +{ + free(dt); +} + +size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */ + FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (tdPtr); + U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1]; + + U32 const maxSV1 = maxSymbolValue + 1; + U32 const tableSize = 1 << tableLog; + U32 highThreshold = tableSize-1; + + /* Sanity Checks */ + if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); + + /* Init, lay down lowprob symbols */ + { FSE_DTableHeader DTableH; + DTableH.tableLog = (U16)tableLog; + DTableH.fastMode = 1; + { S16 const largeLimit= (S16)(1 << (tableLog-1)); + U32 s; + for (s=0; s= largeLimit) DTableH.fastMode=0; + symbolNext[s] = normalizedCounter[s]; + } } } + memcpy(dt, &DTableH, sizeof(DTableH)); + } + + /* Spread symbols */ + { U32 const tableMask = tableSize-1; + U32 const step = FSE_TABLESTEP(tableSize); + U32 s, position = 0; + for (s=0; s highThreshold) position = (position + step) & tableMask; /* lowprob area */ + } } + + if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ + } + + /* Build Decoding table */ + { U32 u; + for (u=0; utableLog = 0; + DTableH->fastMode = 0; + + cell->newState = 0; + cell->symbol = symbolValue; + cell->nbBits = 0; + + return 0; +} + + +size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits) +{ + void* ptr = dt; + FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; + void* dPtr = dt + 1; + FSE_decode_t* const dinfo = (FSE_decode_t*)dPtr; + const unsigned tableSize = 1 << nbBits; + const unsigned tableMask = tableSize - 1; + const unsigned maxSV1 = tableMask+1; + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return ERROR(GENERIC); /* min size */ + + /* Build Decoding Table */ + DTableH->tableLog = (U16)nbBits; + DTableH->fastMode = 1; + for (s=0; s sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[1] = FSE_GETSYMBOL(&state2); + + if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + { if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) { op+=2; break; } } + + op[2] = FSE_GETSYMBOL(&state1); + + if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ + BIT_reloadDStream(&bitD); + + op[3] = FSE_GETSYMBOL(&state2); + } + + /* tail */ + /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */ + while (1) { + if (op>(omax-2)) return ERROR(dstSize_tooSmall); + + *op++ = FSE_GETSYMBOL(&state1); + + if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) { + *op++ = FSE_GETSYMBOL(&state2); + break; + } + + if (op>(omax-2)) return ERROR(dstSize_tooSmall); + + *op++ = FSE_GETSYMBOL(&state2); + + if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) { + *op++ = FSE_GETSYMBOL(&state1); + break; + } } + + return op-ostart; +} + + +size_t FSE_decompress_usingDTable(void* dst, size_t originalSize, + const void* cSrc, size_t cSrcSize, + const FSE_DTable* dt) +{ + const void* ptr = dt; + const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr; + const U32 fastMode = DTableH->fastMode; + + /* select fast mode (static) */ + if (fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); + return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); +} + + +size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* const istart = (const BYTE*)cSrc; + const BYTE* ip = istart; + short counting[FSE_MAX_SYMBOL_VALUE+1]; + DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ + unsigned tableLog; + unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE; + + if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */ + + /* normal FSE decoding mode */ + { size_t const NCountLength = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); + if (FSE_isError(NCountLength)) return NCountLength; + if (NCountLength >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */ + ip += NCountLength; + cSrcSize -= NCountLength; + } + + { size_t const errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog); + if (FSE_isError(errorCode)) return errorCode; } + + return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); /* always return, even if it is an error code */ +} + + + +#endif /* FSE_COMMONDEFS_ONLY */ diff --git a/uppsrc/plugin/zstd/common/huf.h b/uppsrc/plugin/zstd/common/huf.h new file mode 100644 index 000000000..3b837f101 --- /dev/null +++ b/uppsrc/plugin/zstd/common/huf.h @@ -0,0 +1,228 @@ +/* ****************************************************************** + Huffman coder, part of New Generation Entropy library + header file + Copyright (C) 2013-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Source repository : https://github.com/Cyan4973/FiniteStateEntropy +****************************************************************** */ +#ifndef HUF_H_298734234 +#define HUF_H_298734234 + +#if defined (__cplusplus) +extern "C" { +#endif + + +/* *** Dependencies *** */ +#include /* size_t */ + + +/* *** simple functions *** */ +/** +HUF_compress() : + Compress content from buffer 'src', of size 'srcSize', into buffer 'dst'. + 'dst' buffer must be already allocated. + Compression runs faster if `dstCapacity` >= HUF_compressBound(srcSize). + `srcSize` must be <= `HUF_BLOCKSIZE_MAX` == 128 KB. + @return : size of compressed data (<= `dstCapacity`). + Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!! + if return == 1, srcData is a single repeated byte symbol (RLE compression). + if HUF_isError(return), compression failed (more details using HUF_getErrorName()) +*/ +size_t HUF_compress(void* dst, size_t dstCapacity, + const void* src, size_t srcSize); + +/** +HUF_decompress() : + Decompress HUF data from buffer 'cSrc', of size 'cSrcSize', + into already allocated buffer 'dst', of minimum size 'dstSize'. + `dstSize` : **must** be the ***exact*** size of original (uncompressed) data. + Note : in contrast with FSE, HUF_decompress can regenerate + RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, + because it knows size to regenerate. + @return : size of regenerated data (== dstSize), + or an error code, which can be tested using HUF_isError() +*/ +size_t HUF_decompress(void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize); + + +/* **************************************** +* Tool functions +******************************************/ +#define HUF_BLOCKSIZE_MAX (128 * 1024) +size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */ + +/* Error Management */ +unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */ +const char* HUF_getErrorName(size_t code); /**< provides error code string (useful for debugging) */ + + +/* *** Advanced function *** */ + +/** HUF_compress2() : +* Same as HUF_compress(), but offers direct control over `maxSymbolValue` and `tableLog` */ +size_t HUF_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); + + +#ifdef HUF_STATIC_LINKING_ONLY + +/* *** Dependencies *** */ +#include "mem.h" /* U32 */ + + +/* *** Constants *** */ +#define HUF_TABLELOG_ABSOLUTEMAX 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */ +#define HUF_TABLELOG_MAX 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */ +#define HUF_TABLELOG_DEFAULT HUF_TABLELOG_MAX /* tableLog by default, when not specified */ +#define HUF_SYMBOLVALUE_MAX 255 +#if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX) +# error "HUF_TABLELOG_MAX is too large !" +#endif + + +/* **************************************** +* Static allocation +******************************************/ +/* HUF buffer bounds */ +#define HUF_CTABLEBOUND 129 +#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */ +#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ + +/* static allocation of HUF's Compression Table */ +#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \ + U32 name##hb[maxSymbolValue+1]; \ + void* name##hv = &(name##hb); \ + HUF_CElt* name = (HUF_CElt*)(name##hv) /* no final ; */ + +/* static allocation of HUF's DTable */ +typedef U32 HUF_DTable; +#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog))) +#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ + HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1)*0x1000001) } +#define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \ + HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog)*0x1000001) } + + +/* **************************************** +* Advanced decompression functions +******************************************/ +size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ + +size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< decodes RLE and uncompressed */ +size_t HUF_decompress4X_hufOnly(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< considers RLE and uncompressed as errors */ +size_t HUF_decompress4X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +size_t HUF_decompress4X4_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ + +size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); +size_t HUF_decompress1X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ +size_t HUF_decompress1X4_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ + + +/* **************************************** +* HUF detailed API +******************************************/ +/*! +HUF_compress() does the following: +1. count symbol occurrence from source[] into table count[] using FSE_count() +2. (optional) refine tableLog using HUF_optimalTableLog() +3. build Huffman table from count using HUF_buildCTable() +4. save Huffman table to memory buffer using HUF_writeCTable() +5. encode the data stream using HUF_compress4X_usingCTable() + +The following API allows targeting specific sub-functions for advanced tasks. +For example, it's possible to compress several blocks using the same 'CTable', +or to save and regenerate 'CTable' using external methods. +*/ +/* FSE_count() : find it within "fse.h" */ +unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); +typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */ +size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits); +size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog); +size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable); + + +/*! HUF_readStats() : + Read compact Huffman tree, saved by HUF_writeCTable(). + `huffWeight` is destination buffer. + @return : size read from `src` , or an error Code . + Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */ +size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, + U32* nbSymbolsPtr, U32* tableLogPtr, + const void* src, size_t srcSize); + +/** HUF_readCTable() : +* Loading a CTable saved with HUF_writeCTable() */ +size_t HUF_readCTable (HUF_CElt* CTable, unsigned maxSymbolValue, const void* src, size_t srcSize); + + +/* +HUF_decompress() does the following: +1. select the decompression algorithm (X2, X4) based on pre-computed heuristics +2. build Huffman table from save, using HUF_readDTableXn() +3. decode 1 or 4 segments in parallel using HUF_decompressSXn_usingDTable +*/ + +/** HUF_selectDecoder() : +* Tells which decoder is likely to decode faster, +* based on a set of pre-determined metrics. +* @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 . +* Assumption : 0 < cSrcSize < dstSize <= 128 KB */ +U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize); + +size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize); +size_t HUF_readDTableX4 (HUF_DTable* DTable, const void* src, size_t srcSize); + +size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +size_t HUF_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +size_t HUF_decompress4X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); + + +/* single stream variants */ + +size_t HUF_compress1X (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); +size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable); + +size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ +size_t HUF_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */ + +size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +size_t HUF_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); +size_t HUF_decompress1X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); + + +#endif /* HUF_STATIC_LINKING_ONLY */ + + +#if defined (__cplusplus) +} +#endif + +#endif /* HUF_H_298734234 */ diff --git a/uppsrc/plugin/zstd/common/mem.h b/uppsrc/plugin/zstd/common/mem.h new file mode 100644 index 000000000..9156bfda9 --- /dev/null +++ b/uppsrc/plugin/zstd/common/mem.h @@ -0,0 +1,377 @@ +/* ****************************************************************** + mem.h + low-level memory access routines + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ +#ifndef MEM_H_MODULE +#define MEM_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + +/*-**************************************** +* Dependencies +******************************************/ +#include /* size_t, ptrdiff_t */ +#include /* memcpy */ +#if defined(_MSC_VER) /* Visual Studio */ +# include /* _byteswap_ulong */ +#endif + + +/*-**************************************** +* Compiler specifics +******************************************/ +#if defined(_MSC_VER) +# include /* _byteswap_ */ +#endif +#if defined(__GNUC__) +# define MEM_STATIC static __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define MEM_STATIC static inline +#elif defined(_MSC_VER) +# define MEM_STATIC static __inline +#else +# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/*-************************************************************** +* Basic Types +*****************************************************************/ +#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) ) +# include + typedef uint8_t BYTE; + typedef uint16_t U16; + typedef int16_t S16; + typedef uint32_t U32; + typedef int32_t S32; + typedef uint64_t U64; + typedef int64_t S64; +#else + typedef unsigned char BYTE; + typedef unsigned short U16; + typedef signed short S16; + typedef unsigned int U32; + typedef signed int S32; + typedef unsigned long long U64; + typedef signed long long S64; +#endif + + +/*-************************************************************** +* Memory I/O +*****************************************************************/ +/* MEM_FORCE_MEMORY_ACCESS : + * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. + * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. + * The below switch allow to select different access method for improved performance. + * Method 0 (default) : use `memcpy()`. Safe and portable. + * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). + * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. + * Method 2 : direct access. This method is portable but violate C standard. + * It can generate buggy code on targets depending on alignment. + * In some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) + * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ +# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) +# define MEM_FORCE_MEMORY_ACCESS 2 +# elif defined(__INTEL_COMPILER) || \ + (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) +# define MEM_FORCE_MEMORY_ACCESS 1 +# endif +#endif + +MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t)==4; } +MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t)==8; } + +MEM_STATIC unsigned MEM_isLittleEndian(void) +{ + const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + return one.c[0]; +} + +#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) + +/* violates C standard, by lying on structure alignment. +Only use if no other choice to achieve best performance on target platform */ +MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } +MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } +MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } +MEM_STATIC U64 MEM_readST(const void* memPtr) { return *(const size_t*) memPtr; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } +MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } +MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(U64*)memPtr = value; } + +#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) + +/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ +/* currently only defined for gcc and icc */ +typedef union { U16 u16; U32 u32; U64 u64; size_t st; } __attribute__((packed)) unalign; + +MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } +MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } +MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } +MEM_STATIC U64 MEM_readST(const void* ptr) { return ((const unalign*)ptr)->st; } + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } +MEM_STATIC void MEM_write32(void* memPtr, U32 value) { ((unalign*)memPtr)->u32 = value; } +MEM_STATIC void MEM_write64(void* memPtr, U64 value) { ((unalign*)memPtr)->u64 = value; } + +#else + +/* default method, safe and standard. + can sometimes prove slower */ + +MEM_STATIC U16 MEM_read16(const void* memPtr) +{ + U16 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U32 MEM_read32(const void* memPtr) +{ + U32 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC U64 MEM_read64(const void* memPtr) +{ + U64 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC size_t MEM_readST(const void* memPtr) +{ + size_t val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +MEM_STATIC void MEM_write16(void* memPtr, U16 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +MEM_STATIC void MEM_write32(void* memPtr, U32 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +MEM_STATIC void MEM_write64(void* memPtr, U64 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +#endif /* MEM_FORCE_MEMORY_ACCESS */ + +MEM_STATIC U32 MEM_swap32(U32 in) +{ +#if defined(_MSC_VER) /* Visual Studio */ + return _byteswap_ulong(in); +#elif defined (__GNUC__) + return __builtin_bswap32(in); +#else + return ((in << 24) & 0xff000000 ) | + ((in << 8) & 0x00ff0000 ) | + ((in >> 8) & 0x0000ff00 ) | + ((in >> 24) & 0x000000ff ); +#endif +} + +MEM_STATIC U64 MEM_swap64(U64 in) +{ +#if defined(_MSC_VER) /* Visual Studio */ + return _byteswap_uint64(in); +#elif defined (__GNUC__) + return __builtin_bswap64(in); +#else + return ((in << 56) & 0xff00000000000000ULL) | + ((in << 40) & 0x00ff000000000000ULL) | + ((in << 24) & 0x0000ff0000000000ULL) | + ((in << 8) & 0x000000ff00000000ULL) | + ((in >> 8) & 0x00000000ff000000ULL) | + ((in >> 24) & 0x0000000000ff0000ULL) | + ((in >> 40) & 0x000000000000ff00ULL) | + ((in >> 56) & 0x00000000000000ffULL); +#endif +} + +MEM_STATIC size_t MEM_swapST(size_t in) +{ + if (MEM_32bits()) + return (size_t)MEM_swap32((U32)in); + else + return (size_t)MEM_swap64((U64)in); +} + +/*=== Little endian r/w ===*/ + +MEM_STATIC U16 MEM_readLE16(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read16(memPtr); + else { + const BYTE* p = (const BYTE*)memPtr; + return (U16)(p[0] + (p[1]<<8)); + } +} + +MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) +{ + if (MEM_isLittleEndian()) { + MEM_write16(memPtr, val); + } else { + BYTE* p = (BYTE*)memPtr; + p[0] = (BYTE)val; + p[1] = (BYTE)(val>>8); + } +} + +MEM_STATIC U32 MEM_readLE32(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read32(memPtr); + else + return MEM_swap32(MEM_read32(memPtr)); +} + +MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32) +{ + if (MEM_isLittleEndian()) + MEM_write32(memPtr, val32); + else + MEM_write32(memPtr, MEM_swap32(val32)); +} + +MEM_STATIC U64 MEM_readLE64(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_read64(memPtr); + else + return MEM_swap64(MEM_read64(memPtr)); +} + +MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64) +{ + if (MEM_isLittleEndian()) + MEM_write64(memPtr, val64); + else + MEM_write64(memPtr, MEM_swap64(val64)); +} + +MEM_STATIC size_t MEM_readLEST(const void* memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readLE32(memPtr); + else + return (size_t)MEM_readLE64(memPtr); +} + +MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeLE32(memPtr, (U32)val); + else + MEM_writeLE64(memPtr, (U64)val); +} + +/*=== Big endian r/w ===*/ + +MEM_STATIC U32 MEM_readBE32(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_swap32(MEM_read32(memPtr)); + else + return MEM_read32(memPtr); +} + +MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32) +{ + if (MEM_isLittleEndian()) + MEM_write32(memPtr, MEM_swap32(val32)); + else + MEM_write32(memPtr, val32); +} + +MEM_STATIC U64 MEM_readBE64(const void* memPtr) +{ + if (MEM_isLittleEndian()) + return MEM_swap64(MEM_read64(memPtr)); + else + return MEM_read64(memPtr); +} + +MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64) +{ + if (MEM_isLittleEndian()) + MEM_write64(memPtr, MEM_swap64(val64)); + else + MEM_write64(memPtr, val64); +} + +MEM_STATIC size_t MEM_readBEST(const void* memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readBE32(memPtr); + else + return (size_t)MEM_readBE64(memPtr); +} + +MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeBE32(memPtr, (U32)val); + else + MEM_writeBE64(memPtr, (U64)val); +} + + +/* function safe only for comparisons */ +MEM_STATIC U32 MEM_readMINMATCH(const void* memPtr, U32 length) +{ + switch (length) + { + default : + case 4 : return MEM_read32(memPtr); + case 3 : if (MEM_isLittleEndian()) + return MEM_read32(memPtr)<<8; + else + return MEM_read32(memPtr)>>8; + } +} + +#if defined (__cplusplus) +} +#endif + +#endif /* MEM_H_MODULE */ + diff --git a/uppsrc/plugin/zstd/common/zbuff.h b/uppsrc/plugin/zstd/common/zbuff.h new file mode 100644 index 000000000..7820db26d --- /dev/null +++ b/uppsrc/plugin/zstd/common/zbuff.h @@ -0,0 +1,197 @@ +/* + Buffered version of Zstd compression library + Copyright (C) 2015-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : http://www.zstd.net/ +*/ +#ifndef ZSTD_BUFFERED_H_23987 +#define ZSTD_BUFFERED_H_23987 + +#if defined (__cplusplus) +extern "C" { +#endif + +/* ************************************* +* Dependencies +***************************************/ +#include /* size_t */ + + +/* *************************************************************** +* Compiler specifics +*****************************************************************/ +/* ZSTD_DLL_EXPORT : +* Enable exporting of functions when building a Windows DLL */ +#if defined(_WIN32) && defined(ZSTD_DLL_EXPORT) && (ZSTD_DLL_EXPORT==1) +# define ZSTDLIB_API __declspec(dllexport) +#else +# define ZSTDLIB_API +#endif + + +/* ************************************* +* Streaming functions +***************************************/ +typedef struct ZBUFF_CCtx_s ZBUFF_CCtx; +ZSTDLIB_API ZBUFF_CCtx* ZBUFF_createCCtx(void); +ZSTDLIB_API size_t ZBUFF_freeCCtx(ZBUFF_CCtx* cctx); + +ZSTDLIB_API size_t ZBUFF_compressInit(ZBUFF_CCtx* cctx, int compressionLevel); +ZSTDLIB_API size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel); + +ZSTDLIB_API size_t ZBUFF_compressContinue(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr, const void* src, size_t* srcSizePtr); +ZSTDLIB_API size_t ZBUFF_compressFlush(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); +ZSTDLIB_API size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); + +/*-************************************************* +* Streaming compression - howto +* +* A ZBUFF_CCtx object is required to track streaming operation. +* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources. +* ZBUFF_CCtx objects can be reused multiple times. +* +* Start by initializing ZBUF_CCtx. +* Use ZBUFF_compressInit() to start a new compression operation. +* Use ZBUFF_compressInitDictionary() for a compression which requires a dictionary. +* +* Use ZBUFF_compressContinue() repetitively to consume input stream. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data. +* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst . +* @return : a hint to preferred nb of bytes to use as input for next function call (it's just a hint, to improve latency) +* or an error code, which can be tested using ZBUFF_isError(). +* +* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush(). +* The nb of bytes written into `dst` will be reported into *dstCapacityPtr. +* Note that the function cannot output more than *dstCapacityPtr, +* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressEnd() instructs to finish a frame. +* It will perform a flush and write frame epilogue. +* The epilogue is required for decoders to consider a frame completed. +* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small. +* In which case, call again ZBUFF_compressFlush() to complete the flush. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : _recommended buffer_ sizes (not compulsory) : ZBUFF_recommendedCInSize() / ZBUFF_recommendedCOutSize() +* input : ZBUFF_recommendedCInSize==128 KB block size is the internal unit, use this value to reduce intermediate stages (better latency) +* output : ZBUFF_recommendedCOutSize==ZSTD_compressBound(128 KB) + 3 + 3 : ensures it's always possible to write/flush/end a full block. Skip some buffering. +* By using both, it ensures that input will be entirely consumed, and output will always contain the result, reducing intermediate buffering. +* **************************************************/ + + +typedef struct ZBUFF_DCtx_s ZBUFF_DCtx; +ZSTDLIB_API ZBUFF_DCtx* ZBUFF_createDCtx(void); +ZSTDLIB_API size_t ZBUFF_freeDCtx(ZBUFF_DCtx* dctx); + +ZSTDLIB_API size_t ZBUFF_decompressInit(ZBUFF_DCtx* dctx); +ZSTDLIB_API size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* dctx, const void* dict, size_t dictSize); + +ZSTDLIB_API size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr); + +/*-*************************************************************************** +* Streaming decompression howto +* +* A ZBUFF_DCtx object is required to track streaming operations. +* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources. +* Use ZBUFF_decompressInit() to start a new decompression operation, +* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary. +* Note that ZBUFF_DCtx objects can be re-init multiple times. +* +* Use ZBUFF_decompressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. +* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`. +* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency), +* or 0 when a frame is completely decoded, +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize() +* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. +* input : ZBUFF_recommendedDInSize == 128KB + 3; +* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . +* *******************************************************************************/ + + +/* ************************************* +* Tool functions +***************************************/ +ZSTDLIB_API unsigned ZBUFF_isError(size_t errorCode); +ZSTDLIB_API const char* ZBUFF_getErrorName(size_t errorCode); + +/** Functions below provide recommended buffer sizes for Compression or Decompression operations. +* These sizes are just hints, they tend to offer better latency */ +ZSTDLIB_API size_t ZBUFF_recommendedCInSize(void); +ZSTDLIB_API size_t ZBUFF_recommendedCOutSize(void); +ZSTDLIB_API size_t ZBUFF_recommendedDInSize(void); +ZSTDLIB_API size_t ZBUFF_recommendedDOutSize(void); + + +#ifdef ZBUFF_STATIC_LINKING_ONLY + +/* ==================================================================================== + * The definitions in this section are considered experimental. + * They should never be used in association with a dynamic library, as they may change in the future. + * They are provided for advanced usages. + * Use them only in association with static linking. + * ==================================================================================== */ + +/*--- Dependency ---*/ +#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */ +#include "zstd.h" + + +/*--- External memory ---*/ +/*! ZBUFF_createCCtx_advanced() : + * Create a ZBUFF compression context using external alloc and free functions */ +ZSTDLIB_API ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem); + +/*! ZBUFF_createDCtx_advanced() : + * Create a ZBUFF decompression context using external alloc and free functions */ +ZSTDLIB_API ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem); + + +/*--- Advanced Streaming function ---*/ +ZSTDLIB_API size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize); + +#endif /* ZBUFF_STATIC_LINKING_ONLY */ + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_BUFFERED_H_23987 */ diff --git a/uppsrc/plugin/zstd/common/zstd.h b/uppsrc/plugin/zstd/common/zstd.h new file mode 100644 index 000000000..47bae1157 --- /dev/null +++ b/uppsrc/plugin/zstd/common/zstd.h @@ -0,0 +1,475 @@ +/* + zstd - standard compression library + Header File + Copyright (C) 2014-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd source repository : https://github.com/Cyan4973/zstd +*/ +#ifndef ZSTD_H_235446 +#define ZSTD_H_235446 + +#if defined (__cplusplus) +extern "C" { +#endif + +/*-************************************* +* Dependencies +***************************************/ +#include /* size_t */ + + +/*-*************************************************************** +* Export parameters +*****************************************************************/ +/*! +* ZSTD_DLL_EXPORT : +* Enable exporting of functions when building a Windows DLL +*/ +#if defined(_WIN32) && defined(ZSTD_DLL_EXPORT) && (ZSTD_DLL_EXPORT==1) +# define ZSTDLIB_API __declspec(dllexport) +#else +# define ZSTDLIB_API +#endif + + +/* ************************************* +* Version +***************************************/ +#define ZSTD_VERSION_MAJOR 0 +#define ZSTD_VERSION_MINOR 7 +#define ZSTD_VERSION_RELEASE 4 + +#define ZSTD_LIB_VERSION ZSTD_VERSION_MAJOR.ZSTD_VERSION_MINOR.ZSTD_VERSION_RELEASE +#define ZSTD_QUOTE(str) #str +#define ZSTD_EXPAND_AND_QUOTE(str) ZSTD_QUOTE(str) +#define ZSTD_VERSION_STRING ZSTD_EXPAND_AND_QUOTE(ZSTD_LIB_VERSION) + +#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE) +ZSTDLIB_API unsigned ZSTD_versionNumber (void); + + +/* ************************************* +* Simple functions +***************************************/ +/*! ZSTD_compress() : + Compresses `srcSize` bytes from buffer `src` into buffer `dst` of size `dstCapacity`. + Destination buffer must be already allocated. + Compression runs faster if `dstCapacity` >= `ZSTD_compressBound(srcSize)`. + @return : the number of bytes written into `dst`, + or an error code if it fails (which can be tested using ZSTD_isError()) */ +ZSTDLIB_API size_t ZSTD_compress( void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + int compressionLevel); + +/** ZSTD_getDecompressedSize() : +* @return : decompressed size if known, 0 otherwise. + note : to know precise reason why result is `0`, follow up with ZSTD_getFrameParams() */ +unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize); + +/*! ZSTD_decompress() : + `compressedSize` : is the _exact_ size of compressed input, otherwise decompression will fail. + `dstCapacity` must be equal or larger than originalSize. + @return : the number of bytes decompressed into `dst` (<= `dstCapacity`), + or an errorCode if it fails (which can be tested using ZSTD_isError()) */ +ZSTDLIB_API size_t ZSTD_decompress( void* dst, size_t dstCapacity, + const void* src, size_t compressedSize); + + +/* ************************************* +* Helper functions +***************************************/ +ZSTDLIB_API size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size (worst case scenario) */ + +/* Error Management */ +ZSTDLIB_API unsigned ZSTD_isError(size_t code); /*!< tells if a `size_t` function result is an error code */ +ZSTDLIB_API const char* ZSTD_getErrorName(size_t code); /*!< provides readable string for an error code */ + + +/* ************************************* +* Explicit memory management +***************************************/ +/** Compression context */ +typedef struct ZSTD_CCtx_s ZSTD_CCtx; /*< incomplete type */ +ZSTDLIB_API ZSTD_CCtx* ZSTD_createCCtx(void); +ZSTDLIB_API size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx); /*!< @return : errorCode */ + +/** ZSTD_compressCCtx() : + Same as ZSTD_compress(), but requires an already allocated ZSTD_CCtx (see ZSTD_createCCtx()) */ +ZSTDLIB_API size_t ZSTD_compressCCtx(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel); + +/** Decompression context */ +typedef struct ZSTD_DCtx_s ZSTD_DCtx; +ZSTDLIB_API ZSTD_DCtx* ZSTD_createDCtx(void); +ZSTDLIB_API size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx); /*!< @return : errorCode */ + +/** ZSTD_decompressDCtx() : +* Same as ZSTD_decompress(), but requires an already allocated ZSTD_DCtx (see ZSTD_createDCtx()) */ +ZSTDLIB_API size_t ZSTD_decompressDCtx(ZSTD_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); + + +/*-************************ +* Simple dictionary API +***************************/ +/*! ZSTD_compress_usingDict() : +* Compression using a pre-defined Dictionary content (see dictBuilder). +* Note 1 : This function load the dictionary, resulting in a significant startup time. +* Note 2 : `dict` must remain accessible and unmodified during compression operation. +* Note 3 : `dict` can be `NULL`, in which case, it's equivalent to ZSTD_compressCCtx() */ +ZSTDLIB_API size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + int compressionLevel); + +/*! ZSTD_decompress_usingDict() : +* Decompression using a pre-defined Dictionary content (see dictBuilder). +* Dictionary must be identical to the one used during compression. +* Note 1 : This function load the dictionary, resulting in a significant startup time +* Note 2 : `dict` must remain accessible and unmodified during compression operation. +* Note 3 : `dict` can be `NULL`, in which case, it's equivalent to ZSTD_decompressDCtx() */ +ZSTDLIB_API size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize); + + +/*-************************** +* Advanced Dictionary API +****************************/ +/*! ZSTD_createCDict() : +* Create a digested dictionary, ready to start compression operation without startup delay. +* `dict` can be released after creation */ +typedef struct ZSTD_CDict_s ZSTD_CDict; +ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel); +ZSTDLIB_API size_t ZSTD_freeCDict(ZSTD_CDict* CDict); + +/*! ZSTD_compress_usingCDict() : +* Compression using a pre-digested Dictionary. +* Much faster than ZSTD_compress_usingDict() when same dictionary is used multiple times. +* Note that compression level is decided during dictionary creation */ +ZSTDLIB_API size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_CDict* cdict); + +/*! ZSTD_createDDict() : +* Create a digested dictionary, ready to start decompression operation without startup delay. +* `dict` can be released after creation */ +typedef struct ZSTD_DDict_s ZSTD_DDict; +ZSTDLIB_API ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize); +ZSTDLIB_API size_t ZSTD_freeDDict(ZSTD_DDict* ddict); + +/*! ZSTD_decompress_usingDDict() : +* Decompression using a pre-digested Dictionary +* Much faster than ZSTD_decompress_usingDict() when same dictionary is used multiple times. */ +ZSTDLIB_API size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_DDict* ddict); + + + +#ifdef ZSTD_STATIC_LINKING_ONLY + +/* ==================================================================================== + * The definitions in this section are considered experimental. + * They should never be used with a dynamic library, as they may change in the future. + * They are provided for advanced usages. + * Use them only in association with static linking. + * ==================================================================================== */ + +/*--- Constants ---*/ +#define ZSTD_MAGICNUMBER 0xFD2FB527 /* v0.7 */ +#define ZSTD_MAGIC_SKIPPABLE_START 0x184D2A50U + +#define ZSTD_WINDOWLOG_MAX_32 25 +#define ZSTD_WINDOWLOG_MAX_64 27 +#define ZSTD_WINDOWLOG_MAX ((U32)(MEM_32bits() ? ZSTD_WINDOWLOG_MAX_32 : ZSTD_WINDOWLOG_MAX_64)) +#define ZSTD_WINDOWLOG_MIN 18 +#define ZSTD_CHAINLOG_MAX (ZSTD_WINDOWLOG_MAX+1) +#define ZSTD_CHAINLOG_MIN 4 +#define ZSTD_HASHLOG_MAX ZSTD_WINDOWLOG_MAX +#define ZSTD_HASHLOG_MIN 12 +#define ZSTD_HASHLOG3_MAX 17 +//#define ZSTD_HASHLOG3_MIN 15 +#define ZSTD_SEARCHLOG_MAX (ZSTD_WINDOWLOG_MAX-1) +#define ZSTD_SEARCHLOG_MIN 1 +#define ZSTD_SEARCHLENGTH_MAX 7 +#define ZSTD_SEARCHLENGTH_MIN 3 +#define ZSTD_TARGETLENGTH_MIN 4 +#define ZSTD_TARGETLENGTH_MAX 999 + +#define ZSTD_FRAMEHEADERSIZE_MAX 18 /* for static allocation */ +static const size_t ZSTD_frameHeaderSize_min = 5; +static const size_t ZSTD_frameHeaderSize_max = ZSTD_FRAMEHEADERSIZE_MAX; +static const size_t ZSTD_skippableHeaderSize = 8; /* magic number + skippable frame length */ + + +/*--- Types ---*/ +typedef enum { ZSTD_fast, ZSTD_dfast, ZSTD_greedy, ZSTD_lazy, ZSTD_lazy2, ZSTD_btlazy2, ZSTD_btopt } ZSTD_strategy; /*< from faster to stronger */ + +typedef struct { + unsigned windowLog; /*< largest match distance : larger == more compression, more memory needed during decompression */ + unsigned chainLog; /*< fully searched segment : larger == more compression, slower, more memory (useless for fast) */ + unsigned hashLog; /*< dispatch table : larger == faster, more memory */ + unsigned searchLog; /*< nb of searches : larger == more compression, slower */ + unsigned searchLength; /*< match length searched : larger == faster decompression, sometimes less compression */ + unsigned targetLength; /*< acceptable match size for optimal parser (only) : larger == more compression, slower */ + ZSTD_strategy strategy; +} ZSTD_compressionParameters; + +typedef struct { + unsigned contentSizeFlag; /*< 1: content size will be in frame header (if known). */ + unsigned checksumFlag; /*< 1: will generate a 22-bits checksum at end of frame, to be used for error detection by decompressor */ + unsigned noDictIDFlag; /*< 1: no dict ID will be saved into frame header (if dictionary compression) */ +} ZSTD_frameParameters; + +typedef struct { + ZSTD_compressionParameters cParams; + ZSTD_frameParameters fParams; +} ZSTD_parameters; + +/* custom memory allocation functions */ +typedef void* (*ZSTD_allocFunction) (void* opaque, size_t size); +typedef void (*ZSTD_freeFunction) (void* opaque, void* address); +typedef struct { ZSTD_allocFunction customAlloc; ZSTD_freeFunction customFree; void* opaque; } ZSTD_customMem; + + +/*-************************************* +* Advanced compression functions +***************************************/ +/*! ZSTD_estimateCCtxSize() : + * Gives the amount of memory allocated for a ZSTD_CCtx given a set of compression parameters. + * `frameContentSize` is an optional parameter, provide `0` if unknown */ +ZSTDLIB_API size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams); + +/*! ZSTD_createCCtx_advanced() : + * Create a ZSTD compression context using external alloc and free functions */ +ZSTDLIB_API ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem); + +/*! ZSTD_createCDict_advanced() : + * Create a ZSTD_CDict using external alloc and free, and customized compression parameters */ +ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced(const void* dict, size_t dictSize, + ZSTD_parameters params, ZSTD_customMem customMem); + +/*! ZSTD_sizeofCCtx() : + * Gives the amount of memory used by a given ZSTD_CCtx */ +ZSTDLIB_API size_t ZSTD_sizeofCCtx(const ZSTD_CCtx* cctx); + +ZSTDLIB_API unsigned ZSTD_maxCLevel (void); + +/*! ZSTD_getParams() : +* same as ZSTD_getCParams(), but @return a full `ZSTD_parameters` object instead of a `ZSTD_compressionParameters`. +* All fields of `ZSTD_frameParameters` are set to default (0) */ +ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize, size_t dictSize); + +/*! ZSTD_getCParams() : +* @return ZSTD_compressionParameters structure for a selected compression level and srcSize. +* `srcSize` value is optional, select 0 if not known */ +ZSTDLIB_API ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSize, size_t dictSize); + +/*! ZSTD_checkCParams() : +* Ensure param values remain within authorized range */ +ZSTDLIB_API size_t ZSTD_checkCParams(ZSTD_compressionParameters params); + +/*! ZSTD_adjustCParams() : +* optimize params for a given `srcSize` and `dictSize`. +* both values are optional, select `0` if unknown. */ +ZSTDLIB_API ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize); + +/*! ZSTD_compress_advanced() : +* Same as ZSTD_compress_usingDict(), with fine-tune control of each compression parameter */ +ZSTDLIB_API size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + ZSTD_parameters params); + + +/*--- Advanced Decompression functions ---*/ + +/*! ZSTD_estimateDCtxSize() : + * Gives the potential amount of memory allocated to create a ZSTD_DCtx */ +ZSTDLIB_API size_t ZSTD_estimateDCtxSize(void); + +/*! ZSTD_createDCtx_advanced() : + * Create a ZSTD decompression context using external alloc and free functions */ +ZSTDLIB_API ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem); + +/*! ZSTD_sizeofDCtx() : + * Gives the amount of memory used by a given ZSTD_DCtx */ +ZSTDLIB_API size_t ZSTD_sizeofDCtx(const ZSTD_DCtx* dctx); + + +/* ****************************************************************** +* Streaming functions (direct mode - synchronous and buffer-less) +********************************************************************/ +ZSTDLIB_API size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel); +ZSTDLIB_API size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel); +ZSTDLIB_API size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, ZSTD_parameters params, unsigned long long pledgedSrcSize); +ZSTDLIB_API size_t ZSTD_copyCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx); + +ZSTDLIB_API size_t ZSTD_compressContinue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); +ZSTDLIB_API size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity); + +/* + A ZSTD_CCtx object is required to track streaming operations. + Use ZSTD_createCCtx() / ZSTD_freeCCtx() to manage resource. + ZSTD_CCtx object can be re-used multiple times within successive compression operations. + + Start by initializing a context. + Use ZSTD_compressBegin(), or ZSTD_compressBegin_usingDict() for dictionary compression, + or ZSTD_compressBegin_advanced(), for finer parameter control. + It's also possible to duplicate a reference context which has already been initialized, using ZSTD_copyCCtx() + + Then, consume your input using ZSTD_compressContinue(). + There are some important considerations to keep in mind when using this advanced function : + - ZSTD_compressContinue() has no internal buffer. It uses externally provided buffer only. + - Interface is synchronous : input is consumed entirely and produce 1 (or more) compressed blocks. + - Caller must ensure there is enough space in `dst` to store compressed data under worst case scenario. + Worst case evaluation is provided by ZSTD_compressBound(). + ZSTD_compressContinue() doesn't guarantee recover after a failed compression. + - ZSTD_compressContinue() presumes prior input ***is still accessible and unmodified*** (up to maximum distance size, see WindowLog). + It remembers all previous contiguous blocks, plus one separated memory segment (which can itself consists of multiple contiguous blocks) + - ZSTD_compressContinue() detects that prior input has been overwritten when `src` buffer overlaps. + In which case, it will "discard" the relevant memory section from its history. + + + Finish a frame with ZSTD_compressEnd(), which will write the epilogue. + Without epilogue, frames will be considered unfinished (broken) by decoders. + + You can then reuse `ZSTD_CCtx` (ZSTD_compressBegin()) to compress some new frame. +*/ + +typedef struct { + unsigned long long frameContentSize; + unsigned windowSize; + unsigned dictID; + unsigned checksumFlag; +} ZSTD_frameParams; + +ZSTDLIB_API size_t ZSTD_getFrameParams(ZSTD_frameParams* fparamsPtr, const void* src, size_t srcSize); /**< doesn't consume input */ + +ZSTDLIB_API size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx); +ZSTDLIB_API size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); +ZSTDLIB_API void ZSTD_copyDCtx(ZSTD_DCtx* dctx, const ZSTD_DCtx* preparedDCtx); + +ZSTDLIB_API size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx); +ZSTDLIB_API size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); + +/* + Streaming decompression, direct mode (bufferless) + + A ZSTD_DCtx object is required to track streaming operations. + Use ZSTD_createDCtx() / ZSTD_freeDCtx() to manage it. + A ZSTD_DCtx object can be re-used multiple times. + + First optional operation is to retrieve frame parameters, using ZSTD_getFrameParams(), which doesn't consume the input. + It can provide the minimum size of rolling buffer required to properly decompress data (`windowSize`), + and optionally the final size of uncompressed content. + (Note : content size is an optional info that may not be present. 0 means : content size unknown) + Frame parameters are extracted from the beginning of compressed frame. + The amount of data to read is variable, from ZSTD_frameHeaderSize_min to ZSTD_frameHeaderSize_max (so if `srcSize` >= ZSTD_frameHeaderSize_max, it will always work) + If `srcSize` is too small for operation to succeed, function will return the minimum size it requires to produce a result. + Result : 0 when successful, it means the ZSTD_frameParams structure has been filled. + >0 : means there is not enough data into `src`. Provides the expected size to successfully decode header. + errorCode, which can be tested using ZSTD_isError() + + Start decompression, with ZSTD_decompressBegin() or ZSTD_decompressBegin_usingDict(). + Alternatively, you can copy a prepared context, using ZSTD_copyDCtx(). + + Then use ZSTD_nextSrcSizeToDecompress() and ZSTD_decompressContinue() alternatively. + ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue(). + ZSTD_decompressContinue() requires this exact amount of bytes, or it will fail. + + @result of ZSTD_decompressContinue() is the number of bytes regenerated within 'dst' (necessarily <= dstCapacity). + It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header. + + ZSTD_decompressContinue() needs previous data blocks during decompression, up to `windowSize`. + They should preferably be located contiguously, prior to current block. + Alternatively, a round buffer of sufficient size is also possible. Sufficient size is determined by frame parameters. + ZSTD_decompressContinue() is very sensitive to contiguity, + if 2 blocks don't follow each other, make sure that either the compressor breaks contiguity at the same place, + or that previous contiguous segment is large enough to properly handle maximum back-reference. + + A frame is fully decoded when ZSTD_nextSrcSizeToDecompress() returns zero. + Context can then be reset to start a new decompression. + + + == Special case : skippable frames == + + Skippable frames allow the integration of user-defined data into a flow of concatenated frames. + Skippable frames will be ignored (skipped) by a decompressor. The format of skippable frame is following: + a) Skippable frame ID - 4 Bytes, Little endian format, any value from 0x184D2A50 to 0x184D2A5F + b) Frame Size - 4 Bytes, Little endian format, unsigned 32-bits + c) Frame Content - any content (User Data) of length equal to Frame Size + For skippable frames ZSTD_decompressContinue() always returns 0. + For skippable frames ZSTD_getFrameParams() returns fparamsPtr->windowLog==0 what means that a frame is skippable. + It also returns Frame Size as fparamsPtr->frameContentSize. +*/ + + +/* ************************************** +* Block functions +****************************************/ +/*! Block functions produce and decode raw zstd blocks, without frame metadata. + Frame metadata cost is typically ~18 bytes, which is non-negligible on very small blocks. + User will have to take in charge required information to regenerate data, such as compressed and content sizes. + + A few rules to respect : + - Uncompressed block size must be <= MIN (128 KB, 1 << windowLog) + + If you need to compress more, cut data into multiple blocks + + Consider using the regular ZSTD_compress() instead, as frame metadata costs become negligible when source size is large. + - Compressing and decompressing require a context structure + + Use ZSTD_createCCtx() and ZSTD_createDCtx() + - It is necessary to init context before starting + + compression : ZSTD_compressBegin() + + decompression : ZSTD_decompressBegin() + + variants _usingDict() are also allowed + + copyCCtx() and copyDCtx() work too + - When a block is considered not compressible enough, ZSTD_compressBlock() result will be zero. + In which case, nothing is produced into `dst`. + + User must test for such outcome and deal directly with uncompressed data + + ZSTD_decompressBlock() doesn't accept uncompressed data as input !!! + + In case of multiple successive blocks, decoder must be informed of uncompressed block existence to follow proper history. + Use ZSTD_insertBlock() in such a case. + Insert block once it's copied into its final position. +*/ + +#define ZSTD_BLOCKSIZE_MAX (128 * 1024) /* define, for static allocation */ +ZSTDLIB_API size_t ZSTD_compressBlock (ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); +ZSTDLIB_API size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); +ZSTDLIB_API size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize); /**< insert block into `dctx` history. Useful to track uncompressed blocks */ + + +#endif /* ZSTD_STATIC_LINKING_ONLY */ + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_H_235446 */ diff --git a/uppsrc/plugin/zstd/common/zstd_common.c b/uppsrc/plugin/zstd/common/zstd_common.c new file mode 100644 index 000000000..0d9c1154e --- /dev/null +++ b/uppsrc/plugin/zstd/common/zstd_common.c @@ -0,0 +1,91 @@ +/* + Common functions of Zstd compression library + Copyright (C) 2015-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : http://www.zstd.net/ +*/ + + +/*-************************************* +* Dependencies +***************************************/ +#include /* malloc */ +#include "error_private.h" +#define ZSTD_STATIC_LINKING_ONLY +#include "zstd.h" /* declaration of ZSTD_isError, ZSTD_getErrorName, ZSTD_getErrorCode, ZSTD_getErrorString, ZSTD_versionNumber */ +#include "zbuff.h" /* declaration of ZBUFF_isError, ZBUFF_getErrorName */ + + +/*-**************************************** +* Version +******************************************/ +unsigned ZSTD_versionNumber (void) { return ZSTD_VERSION_NUMBER; } + + +/*-**************************************** +* ZSTD Error Management +******************************************/ +/*! ZSTD_isError() : +* tells if a return value is an error code */ +unsigned ZSTD_isError(size_t code) { return ERR_isError(code); } + +/*! ZSTD_getErrorName() : +* provides error code string from function result (useful for debugging) */ +const char* ZSTD_getErrorName(size_t code) { return ERR_getErrorName(code); } + +/*! ZSTD_getError() : +* convert a `size_t` function result into a proper ZSTD_errorCode enum */ +ZSTD_ErrorCode ZSTD_getErrorCode(size_t code) { return ERR_getErrorCode(code); } + +/*! ZSTD_getErrorString() : +* provides error code string from enum */ +const char* ZSTD_getErrorString(ZSTD_ErrorCode code) { return ERR_getErrorName(code); } + + +/* ************************************************************** +* ZBUFF Error Management +****************************************************************/ +unsigned ZBUFF_isError(size_t errorCode) { return ERR_isError(errorCode); } + +const char* ZBUFF_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); } + + + +void* ZSTD_defaultAllocFunction(void* opaque, size_t size) +{ + void* address = malloc(size); + (void)opaque; + /* printf("alloc %p, %d opaque=%p \n", address, (int)size, opaque); */ + return address; +} + +void ZSTD_defaultFreeFunction(void* opaque, void* address) +{ + (void)opaque; + /* if (address) printf("free %p opaque=%p \n", address, opaque); */ + free(address); +} diff --git a/uppsrc/plugin/zstd/common/zstd_internal.h b/uppsrc/plugin/zstd/common/zstd_internal.h new file mode 100644 index 000000000..43cbc9a3a --- /dev/null +++ b/uppsrc/plugin/zstd/common/zstd_internal.h @@ -0,0 +1,238 @@ +/* + zstd_internal - common functions to include + Header File for include + Copyright (C) 2014-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : https://www.zstd.net +*/ +#ifndef ZSTD_CCOMMON_H_MODULE +#define ZSTD_CCOMMON_H_MODULE + +/*-************************************* +* Dependencies +***************************************/ +#include "mem.h" +#include "error_private.h" +#define ZSTD_STATIC_LINKING_ONLY +#include "zstd.h" + + +/*-************************************* +* Common macros +***************************************/ +#define MIN(a,b) ((a)<(b) ? (a) : (b)) +#define MAX(a,b) ((a)>(b) ? (a) : (b)) + + +/*-************************************* +* Common constants +***************************************/ +#define ZSTD_OPT_DEBUG 0 /* 3 = compression stats; 5 = check encoded sequences; 9 = full logs */ +#include +#if defined(ZSTD_OPT_DEBUG) && ZSTD_OPT_DEBUG>=9 + #define ZSTD_LOG_PARSER(...) printf(__VA_ARGS__) + #define ZSTD_LOG_ENCODE(...) printf(__VA_ARGS__) + #define ZSTD_LOG_BLOCK(...) printf(__VA_ARGS__) +#else + #define ZSTD_LOG_PARSER(...) + #define ZSTD_LOG_ENCODE(...) + #define ZSTD_LOG_BLOCK(...) +#endif + +#define ZSTD_OPT_NUM (1<<12) +#define ZSTD_DICT_MAGIC 0xEC30A437 /* v0.7 */ + +#define ZSTD_REP_NUM 3 +#define ZSTD_REP_INIT ZSTD_REP_NUM +#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1) +static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 }; + +#define KB *(1 <<10) +#define MB *(1 <<20) +#define GB *(1U<<30) + +#define BIT7 128 +#define BIT6 64 +#define BIT5 32 +#define BIT4 16 +#define BIT1 2 +#define BIT0 1 + +#define ZSTD_WINDOWLOG_ABSOLUTEMIN 10 +static const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 }; +static const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 }; + +#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */ +static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE; +typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t; + +#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */ +#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */ + +#define HufLog 12 +typedef enum { lbt_huffman, lbt_repeat, lbt_raw, lbt_rle } litBlockType_t; + +#define LONGNBSEQ 0x7F00 + +#define MINMATCH 3 +#define EQUAL_READ32 4 + +#define Litbits 8 +#define MaxLit ((1<totalMatchSum += stats->totalSeqSum * ((searchLength == 3) ? 3 : 4); + printf("\navgMatchL=%.2f avgLitL=%.2f match=%.1f%% lit=%.1f%% reps=%d seq=%d\n", (float)stats->totalMatchSum/stats->totalSeqSum, (float)stats->totalLitSum/stats->totalSeqSum, 100.0*stats->totalMatchSum/(stats->totalMatchSum+stats->totalLitSum), 100.0*stats->totalLitSum/(stats->totalMatchSum+stats->totalLitSum), stats->totalRepSum, stats->totalSeqSum); + printf("SumBytes=%d Offset=%d OffCode=%d Match=%d Literal=%d LitLength=%d\n", (stats->priceOffset+stats->priceOffCode+stats->priceMatchLength+stats->priceLiteral+stats->priceLitLength)/8, stats->priceOffset/8, stats->priceOffCode/8, stats->priceMatchLength/8, stats->priceLiteral/8, stats->priceLitLength/8); +} + + +MEM_STATIC void ZSTD_statsInit(ZSTD_stats_t* stats) +{ + stats->totalLitSum = stats->totalMatchSum = stats->totalSeqSum = stats->totalRepSum = 1; + stats->priceOffset = stats->priceOffCode = stats->priceMatchLength = stats->priceLiteral = stats->priceLitLength = 0; +} + + +MEM_STATIC void ZSTD_statsResetFreqs(ZSTD_stats_t* stats) +{ + unsigned u; + + stats->litSum = (2<litLengthSum = MaxLL+1; + stats->matchLengthSum = MaxML+1; + stats->offCodeSum = (MaxOff+1); + + for (u=0; u<=MaxLit; u++) + stats->litFreq[u] = 1; + for (u=0; u<=MaxLL; u++) + stats->litLengthFreq[u] = 1; + for (u=0; u<=MaxML; u++) + stats->matchLengthFreq[u] = 1; + for (u=0; u<=MaxOff; u++) + stats->offCodeFreq[u] = 1; +} + + +MEM_STATIC void ZSTD_statsUpdatePrices(ZSTD_stats_t* stats, size_t litLength, const BYTE* literals, size_t offset, size_t matchLength) +{ + U32 u; + /* literals */ + stats->priceLiteral += litLength * ZSTD_highbit(stats->litSum+1); + for (u=0; u < litLength; u++) + stats->priceLiteral -= ZSTD_highbit(stats->litFreq[literals[u]]+1); + stats->litSum += litLength; + for (u=0; u < litLength; u++) + stats->litFreq[literals[u]]++; + + /* literal Length */ + { static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 16, 17, 17, 18, 18, 19, 19, + 20, 20, 20, 20, 21, 21, 21, 21, + 22, 22, 22, 22, 22, 22, 22, 22, + 23, 23, 23, 23, 23, 23, 23, 23, + 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24 }; + const BYTE LL_deltaCode = 19; + const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit(litLength) + LL_deltaCode : LL_Code[litLength]; + if (litLength) { + stats->priceLitLength += LL_bits[llCode] + ZSTD_highbit(stats->litLengthSum+1) - ZSTD_highbit(stats->litLengthFreq[llCode]+1); + } else { + stats->priceLitLength += ZSTD_highbit(stats->litLengthSum+1) - ZSTD_highbit(stats->litLengthFreq[0]+1); + } + stats->litLengthFreq[llCode]++; + stats->litLengthSum++; + } + + /* match offset */ + { BYTE offCode = (BYTE)ZSTD_highbit(offset+1); + stats->priceOffCode += ZSTD_highbit(stats->offCodeSum+1) - ZSTD_highbit(stats->offCodeFreq[offCode]+1); + stats->priceOffset += offCode; + stats->offCodeSum++; + stats->offCodeFreq[offCode]++; + } + + /* match Length */ + { static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, + 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 }; + const BYTE ML_deltaCode = 36; + const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit(matchLength) + ML_deltaCode : ML_Code[matchLength]; + stats->priceMatchLength += ML_bits[mlCode] + ZSTD_highbit(stats->matchLengthSum+1) - ZSTD_highbit(stats->matchLengthFreq[mlCode]+1); + stats->matchLengthFreq[mlCode]++; + stats->matchLengthSum++; + } + + if (offset == 0) stats->totalRepSum++; + stats->totalSeqSum++; + stats->totalMatchSum += matchLength; + stats->totalLitSum += litLength; +} + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTD_STATIC_H */ diff --git a/uppsrc/plugin/zstd/compress/fse_compress.c b/uppsrc/plugin/zstd/compress/fse_compress.c new file mode 100644 index 000000000..192d55026 --- /dev/null +++ b/uppsrc/plugin/zstd/compress/fse_compress.c @@ -0,0 +1,807 @@ +/* ****************************************************************** + FSE : Finite State Entropy encoder + Copyright (C) 2013-2015, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +/* ************************************************************** +* Compiler specifics +****************************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ +#else +# ifdef __GNUC__ +# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/* ************************************************************** +* Includes +****************************************************************/ +#include /* malloc, free, qsort */ +#include /* memcpy, memset */ +#include /* printf (debug) */ +#include "bitstream.h" +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/* ************************************************************** +* Complex types +****************************************************************/ +typedef U32 CTable_max_t[FSE_CTABLE_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)]; + + +/* ************************************************************** +* Templates +****************************************************************/ +/* + designed to be included + for type-specific functions (template emulation in C) + Objective is to write these functions only once, for improved maintenance +*/ + +/* safety checks */ +#ifndef FSE_FUNCTION_EXTENSION +# error "FSE_FUNCTION_EXTENSION must be defined" +#endif +#ifndef FSE_FUNCTION_TYPE +# error "FSE_FUNCTION_TYPE must be defined" +#endif + +/* Function names */ +#define FSE_CAT(X,Y) X##Y +#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) +#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) + + +/* Function templates */ +size_t FSE_buildCTable(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + U32 const tableSize = 1 << tableLog; + U32 const tableMask = tableSize - 1; + void* const ptr = ct; + U16* const tableU16 = ( (U16*) ptr) + 2; + void* const FSCT = ((U32*)ptr) + 1 /* header */ + (tableLog ? tableSize>>1 : 1) ; + FSE_symbolCompressionTransform* const symbolTT = (FSE_symbolCompressionTransform*) (FSCT); + U32 const step = FSE_TABLESTEP(tableSize); + U32 cumul[FSE_MAX_SYMBOL_VALUE+2]; + + FSE_FUNCTION_TYPE tableSymbol[FSE_MAX_TABLESIZE]; /* memset() is not necessary, even if static analyzer complain about it */ + U32 highThreshold = tableSize-1; + + /* CTable header */ + tableU16[-2] = (U16) tableLog; + tableU16[-1] = (U16) maxSymbolValue; + + /* For explanations on how to distribute symbol values over the table : + * http://fastcompression.blogspot.fr/2014/02/fse-distributing-symbol-values.html */ + + /* symbol start positions */ + { U32 u; + cumul[0] = 0; + for (u=1; u<=maxSymbolValue+1; u++) { + if (normalizedCounter[u-1]==-1) { /* Low proba symbol */ + cumul[u] = cumul[u-1] + 1; + tableSymbol[highThreshold--] = (FSE_FUNCTION_TYPE)(u-1); + } else { + cumul[u] = cumul[u-1] + normalizedCounter[u-1]; + } } + cumul[maxSymbolValue+1] = tableSize+1; + } + + /* Spread symbols */ + { U32 position = 0; + U32 symbol; + for (symbol=0; symbol<=maxSymbolValue; symbol++) { + int nbOccurences; + for (nbOccurences=0; nbOccurences highThreshold) position = (position + step) & tableMask; /* Low proba area */ + } } + + if (position!=0) return ERROR(GENERIC); /* Must have gone through all positions */ + } + + /* Build table */ + { U32 u; for (u=0; u> 3) + 3; + return maxSymbolValue ? maxHeaderSize : FSE_NCOUNTBOUND; /* maxSymbolValue==0 ? use default */ +} + +static short FSE_abs(short a) { return a<0 ? -a : a; } + +static size_t FSE_writeNCount_generic (void* header, size_t headerBufferSize, + const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, + unsigned writeIsSafe) +{ + BYTE* const ostart = (BYTE*) header; + BYTE* out = ostart; + BYTE* const oend = ostart + headerBufferSize; + int nbBits; + const int tableSize = 1 << tableLog; + int remaining; + int threshold; + U32 bitStream; + int bitCount; + unsigned charnum = 0; + int previous0 = 0; + + bitStream = 0; + bitCount = 0; + /* Table Size */ + bitStream += (tableLog-FSE_MIN_TABLELOG) << bitCount; + bitCount += 4; + + /* Init */ + remaining = tableSize+1; /* +1 for extra accuracy */ + threshold = tableSize; + nbBits = tableLog+1; + + while (remaining>1) { /* stops at 1 */ + if (previous0) { + unsigned start = charnum; + while (!normalizedCounter[charnum]) charnum++; + while (charnum >= start+24) { + start+=24; + bitStream += 0xFFFFU << bitCount; + if ((!writeIsSafe) && (out > oend-2)) return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE) bitStream; + out[1] = (BYTE)(bitStream>>8); + out+=2; + bitStream>>=16; + } + while (charnum >= start+3) { + start+=3; + bitStream += 3 << bitCount; + bitCount += 2; + } + bitStream += (charnum-start) << bitCount; + bitCount += 2; + if (bitCount>16) { + if ((!writeIsSafe) && (out > oend - 2)) return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out += 2; + bitStream >>= 16; + bitCount -= 16; + } } + { short count = normalizedCounter[charnum++]; + const short max = (short)((2*threshold-1)-remaining); + remaining -= FSE_abs(count); + if (remaining<1) return ERROR(GENERIC); + count++; /* +1 for extra accuracy */ + if (count>=threshold) count += max; /* [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[ */ + bitStream += count << bitCount; + bitCount += nbBits; + bitCount -= (count>=1; + } + if (bitCount>16) { + if ((!writeIsSafe) && (out > oend - 2)) return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out += 2; + bitStream >>= 16; + bitCount -= 16; + } } + + /* flush remaining bitStream */ + if ((!writeIsSafe) && (out > oend - 2)) return ERROR(dstSize_tooSmall); /* Buffer overflow */ + out[0] = (BYTE)bitStream; + out[1] = (BYTE)(bitStream>>8); + out+= (bitCount+7) /8; + + if (charnum > maxSymbolValue + 1) return ERROR(GENERIC); + + return (out-ostart); +} + + +size_t FSE_writeNCount (void* buffer, size_t bufferSize, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) +{ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(GENERIC); /* Unsupported */ + if (tableLog < FSE_MIN_TABLELOG) return ERROR(GENERIC); /* Unsupported */ + + if (bufferSize < FSE_NCountWriteBound(maxSymbolValue, tableLog)) + return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 0); + + return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 1); +} + + + +/*-************************************************************** +* Counting histogram +****************************************************************/ +/*! FSE_count_simple + This function just counts byte values within `src`, + and store the histogram into table `count`. + This function is unsafe : it doesn't check that all values within `src` can fit into `count`. + For this reason, prefer using a table `count` with 256 elements. + @return : count of most numerous element +*/ +static size_t FSE_count_simple(unsigned* count, unsigned* maxSymbolValuePtr, + const void* src, size_t srcSize) +{ + const BYTE* ip = (const BYTE*)src; + const BYTE* const end = ip + srcSize; + unsigned maxSymbolValue = *maxSymbolValuePtr; + unsigned max=0; + + + memset(count, 0, (maxSymbolValue+1)*sizeof(*count)); + if (srcSize==0) { *maxSymbolValuePtr = 0; return 0; } + + while (ip max) max = count[s]; } + + return (size_t)max; +} + + +static size_t FSE_count_parallel(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize, + unsigned checkMax) +{ + const BYTE* ip = (const BYTE*)source; + const BYTE* const iend = ip+sourceSize; + unsigned maxSymbolValue = *maxSymbolValuePtr; + unsigned max=0; + + + U32 Counting1[256] = { 0 }; + U32 Counting2[256] = { 0 }; + U32 Counting3[256] = { 0 }; + U32 Counting4[256] = { 0 }; + + /* safety checks */ + if (!sourceSize) { + memset(count, 0, maxSymbolValue + 1); + *maxSymbolValuePtr = 0; + return 0; + } + if (!maxSymbolValue) maxSymbolValue = 255; /* 0 == default */ + + /* by stripes of 16 bytes */ + { U32 cached = MEM_read32(ip); ip += 4; + while (ip < iend-15) { + U32 c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + c = cached; cached = MEM_read32(ip); ip += 4; + Counting1[(BYTE) c ]++; + Counting2[(BYTE)(c>>8) ]++; + Counting3[(BYTE)(c>>16)]++; + Counting4[ c>>24 ]++; + } + ip-=4; + } + + /* finish last symbols */ + while (ipmaxSymbolValue; s--) { + Counting1[s] += Counting2[s] + Counting3[s] + Counting4[s]; + if (Counting1[s]) return ERROR(maxSymbolValue_tooSmall); + } } + + { U32 s; for (s=0; s<=maxSymbolValue; s++) { + count[s] = Counting1[s] + Counting2[s] + Counting3[s] + Counting4[s]; + if (count[s] > max) max = count[s]; + }} + + while (!count[maxSymbolValue]) maxSymbolValue--; + *maxSymbolValuePtr = maxSymbolValue; + return (size_t)max; +} + +/* fast variant (unsafe : won't check if src contains values beyond count[] limit) */ +size_t FSE_countFast(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize) +{ + if (sourceSize < 1500) return FSE_count_simple(count, maxSymbolValuePtr, source, sourceSize); + return FSE_count_parallel(count, maxSymbolValuePtr, source, sourceSize, 0); +} + +size_t FSE_count(unsigned* count, unsigned* maxSymbolValuePtr, + const void* source, size_t sourceSize) +{ + if (*maxSymbolValuePtr <255) + return FSE_count_parallel(count, maxSymbolValuePtr, source, sourceSize, 1); + *maxSymbolValuePtr = 255; + return FSE_countFast(count, maxSymbolValuePtr, source, sourceSize); +} + + + +/*-************************************************************** +* FSE Compression Code +****************************************************************/ +/*! FSE_sizeof_CTable() : + FSE_CTable is a variable size structure which contains : + `U16 tableLog;` + `U16 maxSymbolValue;` + `U16 nextStateNumber[1 << tableLog];` // This size is variable + `FSE_symbolCompressionTransform symbolTT[maxSymbolValue+1];` // This size is variable +Allocation is manual (C standard does not support variable-size structures). +*/ + +size_t FSE_sizeof_CTable (unsigned maxSymbolValue, unsigned tableLog) +{ + size_t size; + FSE_STATIC_ASSERT((size_t)FSE_CTABLE_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)*4 >= sizeof(CTable_max_t)); /* A compilation error here means FSE_CTABLE_SIZE_U32 is not large enough */ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(GENERIC); + size = FSE_CTABLE_SIZE_U32 (tableLog, maxSymbolValue) * sizeof(U32); + return size; +} + +FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog) +{ + size_t size; + if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX; + size = FSE_CTABLE_SIZE_U32 (tableLog, maxSymbolValue) * sizeof(U32); + return (FSE_CTable*)malloc(size); +} + +void FSE_freeCTable (FSE_CTable* ct) { free(ct); } + +/* provides the minimum logSize to safely represent a distribution */ +static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue) +{ + U32 minBitsSrc = BIT_highbit32((U32)(srcSize - 1)) + 1; + U32 minBitsSymbols = BIT_highbit32(maxSymbolValue) + 2; + U32 minBits = minBitsSrc < minBitsSymbols ? minBitsSrc : minBitsSymbols; + return minBits; +} + +unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus) +{ + U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - minus; + U32 tableLog = maxTableLog; + U32 minBits = FSE_minTableLog(srcSize, maxSymbolValue); + if (tableLog==0) tableLog = FSE_DEFAULT_TABLELOG; + if (maxBitsSrc < tableLog) tableLog = maxBitsSrc; /* Accuracy can be reduced */ + if (minBits > tableLog) tableLog = minBits; /* Need a minimum to safely represent all symbol values */ + if (tableLog < FSE_MIN_TABLELOG) tableLog = FSE_MIN_TABLELOG; + if (tableLog > FSE_MAX_TABLELOG) tableLog = FSE_MAX_TABLELOG; + return tableLog; +} + +unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue) +{ + return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 2); +} + + +/* Secondary normalization method. + To be used when primary method fails. */ + +static size_t FSE_normalizeM2(short* norm, U32 tableLog, const unsigned* count, size_t total, U32 maxSymbolValue) +{ + U32 s; + U32 distributed = 0; + U32 ToDistribute; + + /* Init */ + U32 lowThreshold = (U32)(total >> tableLog); + U32 lowOne = (U32)((total * 3) >> (tableLog + 1)); + + for (s=0; s<=maxSymbolValue; s++) { + if (count[s] == 0) { + norm[s]=0; + continue; + } + if (count[s] <= lowThreshold) { + norm[s] = -1; + distributed++; + total -= count[s]; + continue; + } + if (count[s] <= lowOne) { + norm[s] = 1; + distributed++; + total -= count[s]; + continue; + } + norm[s]=-2; + } + ToDistribute = (1 << tableLog) - distributed; + + if ((total / ToDistribute) > lowOne) { + /* risk of rounding to zero */ + lowOne = (U32)((total * 3) / (ToDistribute * 2)); + for (s=0; s<=maxSymbolValue; s++) { + if ((norm[s] == -2) && (count[s] <= lowOne)) { + norm[s] = 1; + distributed++; + total -= count[s]; + continue; + } } + ToDistribute = (1 << tableLog) - distributed; + } + + if (distributed == maxSymbolValue+1) { + /* all values are pretty poor; + probably incompressible data (should have already been detected); + find max, then give all remaining points to max */ + U32 maxV = 0, maxC = 0; + for (s=0; s<=maxSymbolValue; s++) + if (count[s] > maxC) maxV=s, maxC=count[s]; + norm[maxV] += (short)ToDistribute; + return 0; + } + + { + U64 const vStepLog = 62 - tableLog; + U64 const mid = (1ULL << (vStepLog-1)) - 1; + U64 const rStep = ((((U64)1<> vStepLog); + U32 sEnd = (U32)(end >> vStepLog); + U32 weight = sEnd - sStart; + if (weight < 1) + return ERROR(GENERIC); + norm[s] = (short)weight; + tmpTotal = end; + } } } + + return 0; +} + + +size_t FSE_normalizeCount (short* normalizedCounter, unsigned tableLog, + const unsigned* count, size_t total, + unsigned maxSymbolValue) +{ + /* Sanity checks */ + if (tableLog==0) tableLog = FSE_DEFAULT_TABLELOG; + if (tableLog < FSE_MIN_TABLELOG) return ERROR(GENERIC); /* Unsupported size */ + if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); /* Unsupported size */ + if (tableLog < FSE_minTableLog(total, maxSymbolValue)) return ERROR(GENERIC); /* Too small tableLog, compression potentially impossible */ + + { U32 const rtbTable[] = { 0, 473195, 504333, 520860, 550000, 700000, 750000, 830000 }; + + U64 const scale = 62 - tableLog; + U64 const step = ((U64)1<<62) / total; /* <== here, one division ! */ + U64 const vStep = 1ULL<<(scale-20); + int stillToDistribute = 1<> tableLog); + + for (s=0; s<=maxSymbolValue; s++) { + if (count[s] == total) return 0; /* rle special case */ + if (count[s] == 0) { normalizedCounter[s]=0; continue; } + if (count[s] <= lowThreshold) { + normalizedCounter[s] = -1; + stillToDistribute--; + } else { + short proba = (short)((count[s]*step) >> scale); + if (proba<8) { + U64 restToBeat = vStep * rtbTable[proba]; + proba += (count[s]*step) - ((U64)proba< restToBeat; + } + if (proba > largestP) largestP=proba, largest=s; + normalizedCounter[s] = proba; + stillToDistribute -= proba; + } } + if (-stillToDistribute >= (normalizedCounter[largest] >> 1)) { + /* corner case, need another normalization method */ + size_t errorCode = FSE_normalizeM2(normalizedCounter, tableLog, count, total, maxSymbolValue); + if (FSE_isError(errorCode)) return errorCode; + } + else normalizedCounter[largest] += (short)stillToDistribute; + } + +#if 0 + { /* Print Table (debug) */ + U32 s; + U32 nTotal = 0; + for (s=0; s<=maxSymbolValue; s++) + printf("%3i: %4i \n", s, normalizedCounter[s]); + for (s=0; s<=maxSymbolValue; s++) + nTotal += abs(normalizedCounter[s]); + if (nTotal != (1U<>1); /* assumption : tableLog >= 1 */ + FSE_symbolCompressionTransform* const symbolTT = (FSE_symbolCompressionTransform*) (FSCT); + unsigned s; + + /* Sanity checks */ + if (nbBits < 1) return ERROR(GENERIC); /* min size */ + + /* header */ + tableU16[-2] = (U16) nbBits; + tableU16[-1] = (U16) maxSymbolValue; + + /* Build table */ + for (s=0; s FSE_MAX_TABLELOG*4+7 ) && (srcSize & 2)) { /* test bit 2 */ + FSE_encodeSymbol(&bitC, &CState2, *--ip); + FSE_encodeSymbol(&bitC, &CState1, *--ip); + FSE_FLUSHBITS(&bitC); + } + + /* 2 or 4 encoding per loop */ + for ( ; ip>istart ; ) { + + FSE_encodeSymbol(&bitC, &CState2, *--ip); + + if (sizeof(bitC.bitContainer)*8 < FSE_MAX_TABLELOG*2+7 ) /* this test must be static */ + FSE_FLUSHBITS(&bitC); + + FSE_encodeSymbol(&bitC, &CState1, *--ip); + + if (sizeof(bitC.bitContainer)*8 > FSE_MAX_TABLELOG*4+7 ) { /* this test must be static */ + FSE_encodeSymbol(&bitC, &CState2, *--ip); + FSE_encodeSymbol(&bitC, &CState1, *--ip); + } + + FSE_FLUSHBITS(&bitC); + } + + FSE_flushCState(&bitC, &CState2); + FSE_flushCState(&bitC, &CState1); + return BIT_closeCStream(&bitC); +} + +size_t FSE_compress_usingCTable (void* dst, size_t dstSize, + const void* src, size_t srcSize, + const FSE_CTable* ct) +{ + const unsigned fast = (dstSize >= FSE_BLOCKBOUND(srcSize)); + + if (fast) + return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 1); + else + return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 0); +} + + +size_t FSE_compressBound(size_t size) { return FSE_COMPRESSBOUND(size); } + +size_t FSE_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog) +{ + const BYTE* const istart = (const BYTE*) src; + const BYTE* ip = istart; + + BYTE* const ostart = (BYTE*) dst; + BYTE* op = ostart; + BYTE* const oend = ostart + dstSize; + + U32 count[FSE_MAX_SYMBOL_VALUE+1]; + S16 norm[FSE_MAX_SYMBOL_VALUE+1]; + CTable_max_t ct; + size_t errorCode; + + /* init conditions */ + if (srcSize <= 1) return 0; /* Uncompressible */ + if (!maxSymbolValue) maxSymbolValue = FSE_MAX_SYMBOL_VALUE; + if (!tableLog) tableLog = FSE_DEFAULT_TABLELOG; + + /* Scan input and build symbol stats */ + errorCode = FSE_count (count, &maxSymbolValue, ip, srcSize); + if (FSE_isError(errorCode)) return errorCode; + if (errorCode == srcSize) return 1; + if (errorCode == 1) return 0; /* each symbol only present once */ + if (errorCode < (srcSize >> 7)) return 0; /* Heuristic : not compressible enough */ + + tableLog = FSE_optimalTableLog(tableLog, srcSize, maxSymbolValue); + errorCode = FSE_normalizeCount (norm, tableLog, count, srcSize, maxSymbolValue); + if (FSE_isError(errorCode)) return errorCode; + + /* Write table description header */ + errorCode = FSE_writeNCount (op, oend-op, norm, maxSymbolValue, tableLog); + if (FSE_isError(errorCode)) return errorCode; + op += errorCode; + + /* Compress */ + errorCode = FSE_buildCTable (ct, norm, maxSymbolValue, tableLog); + if (FSE_isError(errorCode)) return errorCode; + errorCode = FSE_compress_usingCTable(op, oend - op, ip, srcSize, ct); + if (errorCode == 0) return 0; /* not enough space for compressed data */ + op += errorCode; + + /* check compressibility */ + if ( (size_t)(op-ostart) >= srcSize-1 ) + return 0; + + return op-ostart; +} + +size_t FSE_compress (void* dst, size_t dstSize, const void* src, size_t srcSize) +{ + return FSE_compress2(dst, dstSize, src, (U32)srcSize, FSE_MAX_SYMBOL_VALUE, FSE_DEFAULT_TABLELOG); +} + + +#endif /* FSE_COMMONDEFS_ONLY */ diff --git a/uppsrc/plugin/zstd/compress/huf_compress.c b/uppsrc/plugin/zstd/compress/huf_compress.c new file mode 100644 index 000000000..b5b0eb440 --- /dev/null +++ b/uppsrc/plugin/zstd/compress/huf_compress.c @@ -0,0 +1,577 @@ +/* ****************************************************************** + Huffman encoder, part of New Generation Entropy library + Copyright (C) 2013-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +/* ************************************************************** +* Compiler specifics +****************************************************************/ +#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +/* inline is defined */ +#elif defined(_MSC_VER) +# define inline __inline +#else +# define inline /* disable inline */ +#endif + + +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/* ************************************************************** +* Includes +****************************************************************/ +#include /* memcpy, memset */ +#include /* printf (debug) */ +#include "bitstream.h" +#define FSE_STATIC_LINKING_ONLY /* FSE_optimalTableLog_internal */ +#include "fse.h" /* header compression */ +#define HUF_STATIC_LINKING_ONLY +#include "huf.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/* ************************************************************** +* Utils +****************************************************************/ +unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue) +{ + return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 1); +} + + +/* ******************************************************* +* HUF : Huffman block compression +*********************************************************/ +struct HUF_CElt_s { + U16 val; + BYTE nbBits; +}; /* typedef'd to HUF_CElt within huf_static.h */ + +typedef struct nodeElt_s { + U32 count; + U16 parent; + BYTE byte; + BYTE nbBits; +} nodeElt; + +/*! HUF_writeCTable() : + `CTable` : huffman tree to save, using huf representation. + @return : size of saved CTable */ +size_t HUF_writeCTable (void* dst, size_t maxDstSize, + const HUF_CElt* CTable, U32 maxSymbolValue, U32 huffLog) +{ + BYTE bitsToWeight[HUF_TABLELOG_MAX + 1]; + BYTE huffWeight[HUF_SYMBOLVALUE_MAX + 1]; + U32 n; + BYTE* op = (BYTE*)dst; + size_t size; + + /* check conditions */ + if (maxSymbolValue > HUF_SYMBOLVALUE_MAX + 1) + return ERROR(GENERIC); + + /* convert to weight */ + bitsToWeight[0] = 0; + for (n=1; n<=huffLog; n++) + bitsToWeight[n] = (BYTE)(huffLog + 1 - n); + for (n=0; n= 128) return ERROR(GENERIC); /* should never happen, since maxSymbolValue <= 255 */ + if ((size <= 1) || (size >= maxSymbolValue/2)) { + if (size==1) { /* RLE */ + /* only possible case : series of 1 (because there are at least 2) */ + /* can only be 2^n or (2^n-1), otherwise not an huffman tree */ + BYTE code; + switch(maxSymbolValue) + { + case 1: code = 0; break; + case 2: code = 1; break; + case 3: code = 2; break; + case 4: code = 3; break; + case 7: code = 4; break; + case 8: code = 5; break; + case 15: code = 6; break; + case 16: code = 7; break; + case 31: code = 8; break; + case 32: code = 9; break; + case 63: code = 10; break; + case 64: code = 11; break; + case 127: code = 12; break; + case 128: code = 13; break; + default : return ERROR(corruption_detected); + } + op[0] = (BYTE)(255-13 + code); + return 1; + } + /* Not compressible */ + if (maxSymbolValue > (241-128)) return ERROR(GENERIC); /* not implemented (not possible with current format) */ + if (((maxSymbolValue+1)/2) + 1 > maxDstSize) return ERROR(dstSize_tooSmall); /* not enough space within dst buffer */ + op[0] = (BYTE)(128 /*special case*/ + 0 /* Not Compressible */ + (maxSymbolValue-1)); + huffWeight[maxSymbolValue] = 0; /* to be sure it doesn't cause issue in final combination */ + for (n=0; n HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge); + if (nbSymbols > maxSymbolValue+1) return ERROR(maxSymbolValue_tooSmall); + + /* Prepare base value per rank */ + { U32 n, nextRankStart = 0; + for (n=1; n<=tableLog; n++) { + U32 current = nextRankStart; + nextRankStart += (rankVal[n] << (n-1)); + rankVal[n] = current; + } } + + /* fill nbBits */ + { U32 n; for (n=0; n0; n--) { + valPerRank[n] = min; /* get starting value within each rank */ + min += nbPerRank[n]; + min >>= 1; + } } + /* assign value within rank, symbol order */ + { U32 n; for (n=0; n<=maxSymbolValue; n++) CTable[n].val = valPerRank[CTable[n].nbBits]++; } + } + + return readSize; +} + + +static U32 HUF_setMaxHeight(nodeElt* huffNode, U32 lastNonNull, U32 maxNbBits) +{ + const U32 largestBits = huffNode[lastNonNull].nbBits; + if (largestBits <= maxNbBits) return largestBits; /* early exit : no elt > maxNbBits */ + + /* there are several too large elements (at least >= 2) */ + { int totalCost = 0; + const U32 baseCost = 1 << (largestBits - maxNbBits); + U32 n = lastNonNull; + + while (huffNode[n].nbBits > maxNbBits) { + totalCost += baseCost - (1 << (largestBits - huffNode[n].nbBits)); + huffNode[n].nbBits = (BYTE)maxNbBits; + n --; + } /* n stops at huffNode[n].nbBits <= maxNbBits */ + while (huffNode[n].nbBits == maxNbBits) n--; /* n end at index of smallest symbol using < maxNbBits */ + + /* renorm totalCost */ + totalCost >>= (largestBits - maxNbBits); /* note : totalCost is necessarily a multiple of baseCost */ + + /* repay normalized cost */ + { U32 const noSymbol = 0xF0F0F0F0; + U32 rankLast[HUF_TABLELOG_MAX+2]; + int pos; + + /* Get pos of last (smallest) symbol per rank */ + memset(rankLast, 0xF0, sizeof(rankLast)); + { U32 currentNbBits = maxNbBits; + for (pos=n ; pos >= 0; pos--) { + if (huffNode[pos].nbBits >= currentNbBits) continue; + currentNbBits = huffNode[pos].nbBits; /* < maxNbBits */ + rankLast[maxNbBits-currentNbBits] = pos; + } } + + while (totalCost > 0) { + U32 nBitsToDecrease = BIT_highbit32(totalCost) + 1; + for ( ; nBitsToDecrease > 1; nBitsToDecrease--) { + U32 highPos = rankLast[nBitsToDecrease]; + U32 lowPos = rankLast[nBitsToDecrease-1]; + if (highPos == noSymbol) continue; + if (lowPos == noSymbol) break; + { U32 const highTotal = huffNode[highPos].count; + U32 const lowTotal = 2 * huffNode[lowPos].count; + if (highTotal <= lowTotal) break; + } } + /* only triggered when no more rank 1 symbol left => find closest one (note : there is necessarily at least one !) */ + while ((nBitsToDecrease<=HUF_TABLELOG_MAX) && (rankLast[nBitsToDecrease] == noSymbol)) /* HUF_MAX_TABLELOG test just to please gcc 5+; but it should not be necessary */ + nBitsToDecrease ++; + totalCost -= 1 << (nBitsToDecrease-1); + if (rankLast[nBitsToDecrease-1] == noSymbol) + rankLast[nBitsToDecrease-1] = rankLast[nBitsToDecrease]; /* this rank is no longer empty */ + huffNode[rankLast[nBitsToDecrease]].nbBits ++; + if (rankLast[nBitsToDecrease] == 0) /* special case, reached largest symbol */ + rankLast[nBitsToDecrease] = noSymbol; + else { + rankLast[nBitsToDecrease]--; + if (huffNode[rankLast[nBitsToDecrease]].nbBits != maxNbBits-nBitsToDecrease) + rankLast[nBitsToDecrease] = noSymbol; /* this rank is now empty */ + } } /* while (totalCost > 0) */ + + while (totalCost < 0) { /* Sometimes, cost correction overshoot */ + if (rankLast[1] == noSymbol) { /* special case : no rank 1 symbol (using maxNbBits-1); let's create one from largest rank 0 (using maxNbBits) */ + while (huffNode[n].nbBits == maxNbBits) n--; + huffNode[n+1].nbBits--; + rankLast[1] = n+1; + totalCost++; + continue; + } + huffNode[ rankLast[1] + 1 ].nbBits--; + rankLast[1]++; + totalCost ++; + } } } /* there are several too large elements (at least >= 2) */ + + return maxNbBits; +} + + +typedef struct { + U32 base; + U32 current; +} rankPos; + +static void HUF_sort(nodeElt* huffNode, const U32* count, U32 maxSymbolValue) +{ + rankPos rank[32]; + U32 n; + + memset(rank, 0, sizeof(rank)); + for (n=0; n<=maxSymbolValue; n++) { + U32 r = BIT_highbit32(count[n] + 1); + rank[r].base ++; + } + for (n=30; n>0; n--) rank[n-1].base += rank[n].base; + for (n=0; n<32; n++) rank[n].current = rank[n].base; + for (n=0; n<=maxSymbolValue; n++) { + U32 const c = count[n]; + U32 const r = BIT_highbit32(c+1) + 1; + U32 pos = rank[r].current++; + while ((pos > rank[r].base) && (c > huffNode[pos-1].count)) huffNode[pos]=huffNode[pos-1], pos--; + huffNode[pos].count = c; + huffNode[pos].byte = (BYTE)n; + } +} + + +#define STARTNODE (HUF_SYMBOLVALUE_MAX+1) +size_t HUF_buildCTable (HUF_CElt* tree, const U32* count, U32 maxSymbolValue, U32 maxNbBits) +{ + nodeElt huffNode0[2*HUF_SYMBOLVALUE_MAX+1 +1]; + nodeElt* huffNode = huffNode0 + 1; + U32 n, nonNullRank; + int lowS, lowN; + U16 nodeNb = STARTNODE; + U32 nodeRoot; + + /* safety checks */ + if (maxNbBits == 0) maxNbBits = HUF_TABLELOG_DEFAULT; + if (maxSymbolValue > HUF_SYMBOLVALUE_MAX) return ERROR(GENERIC); + memset(huffNode0, 0, sizeof(huffNode0)); + + /* sort, decreasing order */ + HUF_sort(huffNode, count, maxSymbolValue); + + /* init for parents */ + nonNullRank = maxSymbolValue; + while(huffNode[nonNullRank].count == 0) nonNullRank--; + lowS = nonNullRank; nodeRoot = nodeNb + lowS - 1; lowN = nodeNb; + huffNode[nodeNb].count = huffNode[lowS].count + huffNode[lowS-1].count; + huffNode[lowS].parent = huffNode[lowS-1].parent = nodeNb; + nodeNb++; lowS-=2; + for (n=nodeNb; n<=nodeRoot; n++) huffNode[n].count = (U32)(1U<<30); + huffNode0[0].count = (U32)(1U<<31); + + /* create parents */ + while (nodeNb <= nodeRoot) { + U32 n1 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++; + U32 n2 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++; + huffNode[nodeNb].count = huffNode[n1].count + huffNode[n2].count; + huffNode[n1].parent = huffNode[n2].parent = nodeNb; + nodeNb++; + } + + /* distribute weights (unlimited tree height) */ + huffNode[nodeRoot].nbBits = 0; + for (n=nodeRoot-1; n>=STARTNODE; n--) + huffNode[n].nbBits = huffNode[ huffNode[n].parent ].nbBits + 1; + for (n=0; n<=nonNullRank; n++) + huffNode[n].nbBits = huffNode[ huffNode[n].parent ].nbBits + 1; + + /* enforce maxTableLog */ + maxNbBits = HUF_setMaxHeight(huffNode, nonNullRank, maxNbBits); + + /* fill result into tree (val, nbBits) */ + { U16 nbPerRank[HUF_TABLELOG_MAX+1] = {0}; + U16 valPerRank[HUF_TABLELOG_MAX+1] = {0}; + if (maxNbBits > HUF_TABLELOG_MAX) return ERROR(GENERIC); /* check fit into table */ + for (n=0; n<=nonNullRank; n++) + nbPerRank[huffNode[n].nbBits]++; + /* determine stating value per rank */ + { U16 min = 0; + for (n=maxNbBits; n>0; n--) { + valPerRank[n] = min; /* get starting value within each rank */ + min += nbPerRank[n]; + min >>= 1; + } } + for (n=0; n<=maxSymbolValue; n++) + tree[huffNode[n].byte].nbBits = huffNode[n].nbBits; /* push nbBits per symbol, symbol order */ + for (n=0; n<=maxSymbolValue; n++) + tree[n].val = valPerRank[tree[n].nbBits]++; /* assign value within rank, symbol order */ + } + + return maxNbBits; +} + +static void HUF_encodeSymbol(BIT_CStream_t* bitCPtr, U32 symbol, const HUF_CElt* CTable) +{ + BIT_addBitsFast(bitCPtr, CTable[symbol].val, CTable[symbol].nbBits); +} + +size_t HUF_compressBound(size_t size) { return HUF_COMPRESSBOUND(size); } + +#define HUF_FLUSHBITS(s) (fast ? BIT_flushBitsFast(s) : BIT_flushBits(s)) + +#define HUF_FLUSHBITS_1(stream) \ + if (sizeof((stream)->bitContainer)*8 < HUF_TABLELOG_MAX*2+7) HUF_FLUSHBITS(stream) + +#define HUF_FLUSHBITS_2(stream) \ + if (sizeof((stream)->bitContainer)*8 < HUF_TABLELOG_MAX*4+7) HUF_FLUSHBITS(stream) + +size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable) +{ + const BYTE* ip = (const BYTE*) src; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + size_t n; + const unsigned fast = (dstSize >= HUF_BLOCKBOUND(srcSize)); + BIT_CStream_t bitC; + + /* init */ + if (dstSize < 8) return 0; /* not enough space to compress */ + { size_t const errorCode = BIT_initCStream(&bitC, op, oend-op); + if (HUF_isError(errorCode)) return 0; } + + n = srcSize & ~3; /* join to mod 4 */ + switch (srcSize & 3) + { + case 3 : HUF_encodeSymbol(&bitC, ip[n+ 2], CTable); + HUF_FLUSHBITS_2(&bitC); + case 2 : HUF_encodeSymbol(&bitC, ip[n+ 1], CTable); + HUF_FLUSHBITS_1(&bitC); + case 1 : HUF_encodeSymbol(&bitC, ip[n+ 0], CTable); + HUF_FLUSHBITS(&bitC); + case 0 : + default: ; + } + + for (; n>0; n-=4) { /* note : n&3==0 at this stage */ + HUF_encodeSymbol(&bitC, ip[n- 1], CTable); + HUF_FLUSHBITS_1(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 2], CTable); + HUF_FLUSHBITS_2(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 3], CTable); + HUF_FLUSHBITS_1(&bitC); + HUF_encodeSymbol(&bitC, ip[n- 4], CTable); + HUF_FLUSHBITS(&bitC); + } + + return BIT_closeCStream(&bitC); +} + + +size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable) +{ + size_t const segmentSize = (srcSize+3)/4; /* first 3 segments */ + const BYTE* ip = (const BYTE*) src; + const BYTE* const iend = ip + srcSize; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + + if (dstSize < 6 + 1 + 1 + 1 + 8) return 0; /* minimum space to compress successfully */ + if (srcSize < 12) return 0; /* no saving possible : too small input */ + op += 6; /* jumpTable */ + + { size_t const cSize = HUF_compress1X_usingCTable(op, oend-op, ip, segmentSize, CTable); + if (HUF_isError(cSize)) return cSize; + if (cSize==0) return 0; + MEM_writeLE16(ostart, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + { size_t const cSize = HUF_compress1X_usingCTable(op, oend-op, ip, segmentSize, CTable); + if (HUF_isError(cSize)) return cSize; + if (cSize==0) return 0; + MEM_writeLE16(ostart+2, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + { size_t const cSize = HUF_compress1X_usingCTable(op, oend-op, ip, segmentSize, CTable); + if (HUF_isError(cSize)) return cSize; + if (cSize==0) return 0; + MEM_writeLE16(ostart+4, (U16)cSize); + op += cSize; + } + + ip += segmentSize; + { size_t const cSize = HUF_compress1X_usingCTable(op, oend-op, ip, iend-ip, CTable); + if (HUF_isError(cSize)) return cSize; + if (cSize==0) return 0; + op += cSize; + } + + return op-ostart; +} + + +static size_t HUF_compress_internal ( + void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog, + unsigned singleStream) +{ + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstSize; + BYTE* op = ostart; + + U32 count[HUF_SYMBOLVALUE_MAX+1]; + HUF_CElt CTable[HUF_SYMBOLVALUE_MAX+1]; + + /* checks & inits */ + if (!srcSize) return 0; /* Uncompressed (note : 1 means rle, so first byte must be correct) */ + if (!dstSize) return 0; /* cannot fit within dst budget */ + if (srcSize > HUF_BLOCKSIZE_MAX) return ERROR(srcSize_wrong); /* current block size limit */ + if (huffLog > HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge); + if (!maxSymbolValue) maxSymbolValue = HUF_SYMBOLVALUE_MAX; + if (!huffLog) huffLog = HUF_TABLELOG_DEFAULT; + + /* Scan input and build symbol stats */ + { size_t const largest = FSE_count (count, &maxSymbolValue, (const BYTE*)src, srcSize); + if (HUF_isError(largest)) return largest; + if (largest == srcSize) { *ostart = ((const BYTE*)src)[0]; return 1; } /* rle */ + if (largest <= (srcSize >> 7)+1) return 0; /* Fast heuristic : not compressible enough */ + } + + /* Build Huffman Tree */ + huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue); + { size_t const maxBits = HUF_buildCTable (CTable, count, maxSymbolValue, huffLog); + if (HUF_isError(maxBits)) return maxBits; + huffLog = (U32)maxBits; + } + + /* Write table description header */ + { size_t const hSize = HUF_writeCTable (op, dstSize, CTable, maxSymbolValue, huffLog); + if (HUF_isError(hSize)) return hSize; + if (hSize + 12 >= srcSize) return 0; /* not useful to try compression */ + //static U64 totalHSize = 0; static U32 nbHSize = 0; totalHSize += hSize; nbHSize++; if ((nbHSize & 63) == 1) printf("average : %6.3f \n", (double)totalHSize / nbHSize); + op += hSize; + } + + /* Compress */ + { size_t const cSize = (singleStream) ? + HUF_compress1X_usingCTable(op, oend - op, src, srcSize, CTable) : /* single segment */ + HUF_compress4X_usingCTable(op, oend - op, src, srcSize, CTable); + if (HUF_isError(cSize)) return cSize; + if (cSize==0) return 0; /* uncompressible */ + op += cSize; + } + + /* check compressibility */ + if ((size_t)(op-ostart) >= srcSize-1) + return 0; + + return op-ostart; +} + + +size_t HUF_compress1X (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 1); +} + +size_t HUF_compress2 (void* dst, size_t dstSize, + const void* src, size_t srcSize, + unsigned maxSymbolValue, unsigned huffLog) +{ + return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 0); +} + + +size_t HUF_compress (void* dst, size_t maxDstSize, const void* src, size_t srcSize) +{ + return HUF_compress2(dst, maxDstSize, src, (U32)srcSize, 255, HUF_TABLELOG_DEFAULT); +} diff --git a/uppsrc/plugin/zstd/compress/zbuff_compress.c b/uppsrc/plugin/zstd/compress/zbuff_compress.c new file mode 100644 index 000000000..837d22cf7 --- /dev/null +++ b/uppsrc/plugin/zstd/compress/zbuff_compress.c @@ -0,0 +1,327 @@ +/* + Buffered version of Zstd compression library + Copyright (C) 2015-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : http://www.zstd.net/ +*/ + + +/* ************************************* +* Dependencies +***************************************/ +#include +#include "error_private.h" +#include "zstd_internal.h" /* MIN, ZSTD_BLOCKHEADERSIZE, defaultCustomMem */ +#define ZBUFF_STATIC_LINKING_ONLY +#include "zbuff.h" + + +/* ************************************* +* Constants +***************************************/ +static size_t const ZBUFF_endFrameSize = ZSTD_BLOCKHEADERSIZE; + + +/*_************************************************** +* Streaming compression +* +* A ZBUFF_CCtx object is required to track streaming operation. +* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources. +* Use ZBUFF_compressInit() to start a new compression operation. +* ZBUFF_CCtx objects can be reused multiple times. +* +* Use ZBUFF_compressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to call again the function with remaining input. +* The content of dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters or change dst . +* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to improve latency) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressFlush() can be used to instruct ZBUFF to compress and output whatever remains within its buffer. +* Note that it will not output more than *dstCapacityPtr. +* Therefore, some content might still be left into its internal buffer if dst buffer is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* ZBUFF_compressEnd() instructs to finish a frame. +* It will perform a flush and write frame epilogue. +* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small. +* @return : nb of bytes still present into internal buffer (0 if it's empty) +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : recommended buffer sizes (not compulsory) +* input : ZSTD_BLOCKSIZE_MAX (128 KB), internal unit size, it improves latency to use this value. +* output : ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + ZBUFF_endFrameSize : ensures it's always possible to write/flush/end a full block at best speed. +* **************************************************/ + +typedef enum { ZBUFFcs_init, ZBUFFcs_load, ZBUFFcs_flush, ZBUFFcs_final } ZBUFF_cStage; + +/* *** Resources *** */ +struct ZBUFF_CCtx_s { + ZSTD_CCtx* zc; + char* inBuff; + size_t inBuffSize; + size_t inToCompress; + size_t inBuffPos; + size_t inBuffTarget; + size_t blockSize; + char* outBuff; + size_t outBuffSize; + size_t outBuffContentSize; + size_t outBuffFlushedSize; + ZBUFF_cStage stage; + ZSTD_customMem customMem; +}; /* typedef'd tp ZBUFF_CCtx within "zstd_buffered.h" */ + +ZBUFF_CCtx* ZBUFF_createCCtx(void) +{ + return ZBUFF_createCCtx_advanced(defaultCustomMem); +} + +ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem) +{ + ZBUFF_CCtx* zbc; + + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) + return NULL; + + zbc = (ZBUFF_CCtx*)customMem.customAlloc(customMem.opaque, sizeof(ZBUFF_CCtx)); + if (zbc==NULL) return NULL; + memset(zbc, 0, sizeof(ZBUFF_CCtx)); + memcpy(&zbc->customMem, &customMem, sizeof(ZSTD_customMem)); + zbc->zc = ZSTD_createCCtx_advanced(customMem); + if (zbc->zc == NULL) { ZBUFF_freeCCtx(zbc); return NULL; } + return zbc; +} + +size_t ZBUFF_freeCCtx(ZBUFF_CCtx* zbc) +{ + if (zbc==NULL) return 0; /* support free on NULL */ + ZSTD_freeCCtx(zbc->zc); + if (zbc->inBuff) zbc->customMem.customFree(zbc->customMem.opaque, zbc->inBuff); + if (zbc->outBuff) zbc->customMem.customFree(zbc->customMem.opaque, zbc->outBuff); + zbc->customMem.customFree(zbc->customMem.opaque, zbc); + return 0; +} + + +/* *** Initialization *** */ + +size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize) +{ + /* allocate buffers */ + { size_t const neededInBuffSize = (size_t)1 << params.cParams.windowLog; + if (zbc->inBuffSize < neededInBuffSize) { + zbc->inBuffSize = neededInBuffSize; + zbc->customMem.customFree(zbc->customMem.opaque, zbc->inBuff); /* should not be necessary */ + zbc->inBuff = (char*)zbc->customMem.customAlloc(zbc->customMem.opaque, neededInBuffSize); + if (zbc->inBuff == NULL) return ERROR(memory_allocation); + } + zbc->blockSize = MIN(ZSTD_BLOCKSIZE_MAX, neededInBuffSize); + } + if (zbc->outBuffSize < ZSTD_compressBound(zbc->blockSize)+1) { + zbc->outBuffSize = ZSTD_compressBound(zbc->blockSize)+1; + zbc->customMem.customFree(zbc->customMem.opaque, zbc->outBuff); /* should not be necessary */ + zbc->outBuff = (char*)zbc->customMem.customAlloc(zbc->customMem.opaque, zbc->outBuffSize); + if (zbc->outBuff == NULL) return ERROR(memory_allocation); + } + + { size_t const errorCode = ZSTD_compressBegin_advanced(zbc->zc, dict, dictSize, params, pledgedSrcSize); + if (ZSTD_isError(errorCode)) return errorCode; } + + zbc->inToCompress = 0; + zbc->inBuffPos = 0; + zbc->inBuffTarget = zbc->blockSize; + zbc->outBuffContentSize = zbc->outBuffFlushedSize = 0; + zbc->stage = ZBUFFcs_load; + return 0; /* ready to go */ +} + + +size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* zbc, const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize); + return ZBUFF_compressInit_advanced(zbc, dict, dictSize, params, 0); +} + +size_t ZBUFF_compressInit(ZBUFF_CCtx* zbc, int compressionLevel) +{ + return ZBUFF_compressInitDictionary(zbc, NULL, 0, compressionLevel); +} + + +/* internal util function */ +MEM_STATIC size_t ZBUFF_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + size_t const length = MIN(dstCapacity, srcSize); + memcpy(dst, src, length); + return length; +} + + +/* *** Compression *** */ + +static size_t ZBUFF_compressContinue_generic(ZBUFF_CCtx* zbc, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr, + int flush) +{ + U32 notDone = 1; + const char* const istart = (const char*)src; + const char* const iend = istart + *srcSizePtr; + const char* ip = istart; + char* const ostart = (char*)dst; + char* const oend = ostart + *dstCapacityPtr; + char* op = ostart; + + while (notDone) { + switch(zbc->stage) + { + case ZBUFFcs_init: return ERROR(init_missing); /* call ZBUFF_compressInit() first ! */ + + case ZBUFFcs_load: + /* complete inBuffer */ + { size_t const toLoad = zbc->inBuffTarget - zbc->inBuffPos; + size_t const loaded = ZBUFF_limitCopy(zbc->inBuff + zbc->inBuffPos, toLoad, ip, iend-ip); + zbc->inBuffPos += loaded; + ip += loaded; + if ( (zbc->inBuffPos==zbc->inToCompress) || (!flush && (toLoad != loaded)) ) { + notDone = 0; break; /* not enough input to get a full block : stop there, wait for more */ + } } + /* compress current block (note : this stage cannot be stopped in the middle) */ + { void* cDst; + size_t cSize; + size_t const iSize = zbc->inBuffPos - zbc->inToCompress; + size_t oSize = oend-op; + if (oSize >= ZSTD_compressBound(iSize)) + cDst = op; /* compress directly into output buffer (avoid flush stage) */ + else + cDst = zbc->outBuff, oSize = zbc->outBuffSize; + cSize = ZSTD_compressContinue(zbc->zc, cDst, oSize, zbc->inBuff + zbc->inToCompress, iSize); + if (ZSTD_isError(cSize)) return cSize; + /* prepare next block */ + zbc->inBuffTarget = zbc->inBuffPos + zbc->blockSize; + if (zbc->inBuffTarget > zbc->inBuffSize) + zbc->inBuffPos = 0, zbc->inBuffTarget = zbc->blockSize; /* note : inBuffSize >= blockSize */ + zbc->inToCompress = zbc->inBuffPos; + if (cDst == op) { op += cSize; break; } /* no need to flush */ + zbc->outBuffContentSize = cSize; + zbc->outBuffFlushedSize = 0; + zbc->stage = ZBUFFcs_flush; /* continue to flush stage */ + } + + case ZBUFFcs_flush: + { size_t const toFlush = zbc->outBuffContentSize - zbc->outBuffFlushedSize; + size_t const flushed = ZBUFF_limitCopy(op, oend-op, zbc->outBuff + zbc->outBuffFlushedSize, toFlush); + op += flushed; + zbc->outBuffFlushedSize += flushed; + if (toFlush!=flushed) { notDone = 0; break; } /* dst too small to store flushed data : stop there */ + zbc->outBuffContentSize = zbc->outBuffFlushedSize = 0; + zbc->stage = ZBUFFcs_load; + break; + } + + case ZBUFFcs_final: + notDone = 0; /* do nothing */ + break; + + default: + return ERROR(GENERIC); /* impossible */ + } + } + + *srcSizePtr = ip - istart; + *dstCapacityPtr = op - ostart; + { size_t hintInSize = zbc->inBuffTarget - zbc->inBuffPos; + if (hintInSize==0) hintInSize = zbc->blockSize; + return hintInSize; + } +} + +size_t ZBUFF_compressContinue(ZBUFF_CCtx* zbc, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr) +{ + return ZBUFF_compressContinue_generic(zbc, dst, dstCapacityPtr, src, srcSizePtr, 0); +} + + + +/* *** Finalize *** */ + +size_t ZBUFF_compressFlush(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr) +{ + size_t srcSize = 0; + ZBUFF_compressContinue_generic(zbc, dst, dstCapacityPtr, &srcSize, &srcSize, 1); /* use a valid src address instead of NULL */ + return zbc->outBuffContentSize - zbc->outBuffFlushedSize; +} + + +size_t ZBUFF_compressEnd(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr) +{ + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + *dstCapacityPtr; + BYTE* op = ostart; + + if (zbc->stage != ZBUFFcs_final) { + /* flush whatever remains */ + size_t outSize = *dstCapacityPtr; + size_t const remainingToFlush = ZBUFF_compressFlush(zbc, dst, &outSize); + op += outSize; + if (remainingToFlush) { + *dstCapacityPtr = op-ostart; + return remainingToFlush + ZBUFF_endFrameSize; + } + /* create epilogue */ + zbc->stage = ZBUFFcs_final; + zbc->outBuffContentSize = ZSTD_compressEnd(zbc->zc, zbc->outBuff, zbc->outBuffSize); /* epilogue into outBuff */ + } + + /* flush epilogue */ + { size_t const toFlush = zbc->outBuffContentSize - zbc->outBuffFlushedSize; + size_t const flushed = ZBUFF_limitCopy(op, oend-op, zbc->outBuff + zbc->outBuffFlushedSize, toFlush); + op += flushed; + zbc->outBuffFlushedSize += flushed; + *dstCapacityPtr = op-ostart; + if (toFlush==flushed) zbc->stage = ZBUFFcs_init; /* end reached */ + return toFlush - flushed; + } +} + + + +/* ************************************* +* Tool functions +***************************************/ +size_t ZBUFF_recommendedCInSize(void) { return ZSTD_BLOCKSIZE_MAX; } +size_t ZBUFF_recommendedCOutSize(void) { return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + ZBUFF_endFrameSize; } diff --git a/uppsrc/plugin/zstd/compress/zstd_compress.c b/uppsrc/plugin/zstd/compress/zstd_compress.c new file mode 100644 index 000000000..9baf7c705 --- /dev/null +++ b/uppsrc/plugin/zstd/compress/zstd_compress.c @@ -0,0 +1,3074 @@ +/* + ZSTD HC - High Compression Mode of Zstandard + Copyright (C) 2015-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Zstd source repository : https://www.zstd.net +*/ + + +/* ******************************************************* +* Compiler specifics +*********************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/*-************************************* +* Dependencies +***************************************/ +#include /* memset */ +#include "mem.h" +#define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */ +#include /* XXH_reset, update, digest */ +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "huf.h" +#include "zstd_internal.h" /* includes zstd.h */ + + +/*-************************************* +* Constants +***************************************/ +static const U32 g_searchStrength = 8; /* control skip over incompressible data */ + + +/*-************************************* +* Helper functions +***************************************/ +size_t ZSTD_compressBound(size_t srcSize) { return FSE_compressBound(srcSize) + 12; } + +static U32 ZSTD_highbit32(U32 val) +{ +# if defined(_MSC_VER) /* Visual */ + unsigned long r=0; + _BitScanReverse(&r, val); + return (unsigned)r; +# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */ + return 31 - __builtin_clz(val); +# else /* Software version */ + static const int DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; + U32 v = val; + int r; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + r = DeBruijnClz[(U32)(v * 0x07C4ACDDU) >> 27]; + return r; +# endif +} + +/*-************************************* +* Sequence storage +***************************************/ +static void ZSTD_resetSeqStore(seqStore_t* ssPtr) +{ + ssPtr->offset = ssPtr->offsetStart; + ssPtr->lit = ssPtr->litStart; + ssPtr->litLength = ssPtr->litLengthStart; + ssPtr->matchLength = ssPtr->matchLengthStart; + ssPtr->longLengthID = 0; +} + + +/*-************************************* +* Context memory management +***************************************/ +struct ZSTD_CCtx_s +{ + const BYTE* nextSrc; /* next block here to continue on current prefix */ + const BYTE* base; /* All regular indexes relative to this position */ + const BYTE* dictBase; /* extDict indexes relative to this position */ + U32 dictLimit; /* below that point, need extDict */ + U32 lowLimit; /* below that point, no more data */ + U32 nextToUpdate; /* index from which to continue dictionary update */ + U32 nextToUpdate3; /* index from which to continue dictionary update */ + U32 hashLog3; /* dispatch table : larger == faster, more memory */ + U32 loadedDictEnd; + U32 stage; /* 0: created; 1: init,dictLoad; 2:started */ + U32 rep[ZSTD_REP_NUM]; + U32 savedRep[ZSTD_REP_NUM]; + U32 dictID; + ZSTD_parameters params; + void* workSpace; + size_t workSpaceSize; + size_t blockSize; + U64 frameContentSize; + XXH64_state_t xxhState; + ZSTD_customMem customMem; + + seqStore_t seqStore; /* sequences storage ptrs */ + U32* hashTable; + U32* hashTable3; + U32* chainTable; + HUF_CElt* hufTable; + U32 flagStaticTables; + FSE_CTable offcodeCTable [FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)]; + FSE_CTable matchlengthCTable [FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)]; + FSE_CTable litlengthCTable [FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)]; +}; + +ZSTD_CCtx* ZSTD_createCCtx(void) +{ + return ZSTD_createCCtx_advanced(defaultCustomMem); +} + +ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem) +{ + ZSTD_CCtx* cctx; + + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) + return NULL; + + cctx = (ZSTD_CCtx*) customMem.customAlloc(customMem.opaque, sizeof(ZSTD_CCtx)); + if (!cctx) return NULL; + memset(cctx, 0, sizeof(ZSTD_CCtx)); + memcpy(&(cctx->customMem), &customMem, sizeof(ZSTD_customMem)); + return cctx; +} + +size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx) +{ + if (cctx==NULL) return 0; /* support free on NULL */ + if (cctx->workSpace) cctx->customMem.customFree(cctx->customMem.opaque, cctx->workSpace); + cctx->customMem.customFree(cctx->customMem.opaque, cctx); + return 0; /* reserved as a potential error code in the future */ +} + +size_t ZSTD_sizeofCCtx(const ZSTD_CCtx* cctx) +{ + return sizeof(*cctx) + cctx->workSpaceSize; +} + +const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) /* hidden interface */ +{ + return &(ctx->seqStore); +} + + +#define CLAMP(val,min,max) { if (valmax) val=max; } +#define CLAMPCHECK(val,min,max) { if ((valmax)) return ERROR(compressionParameter_unsupported); } + +/** ZSTD_checkParams() : + ensure param values remain within authorized range. + @return : 0, or an error code if one value is beyond authorized range */ +size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams) +{ + CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX); + CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX); + CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX); + CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX); + { U32 const searchLengthMin = (cParams.strategy == ZSTD_fast || cParams.strategy == ZSTD_greedy) ? ZSTD_SEARCHLENGTH_MIN+1 : ZSTD_SEARCHLENGTH_MIN; + U32 const searchLengthMax = (cParams.strategy == ZSTD_fast) ? ZSTD_SEARCHLENGTH_MAX : ZSTD_SEARCHLENGTH_MAX-1; + CLAMPCHECK(cParams.searchLength, searchLengthMin, searchLengthMax); } + CLAMPCHECK(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX); + if ((U32)(cParams.strategy) > (U32)ZSTD_btopt) return ERROR(compressionParameter_unsupported); + return 0; +} + + +/** ZSTD_checkCParams_advanced() : + temporary work-around, while the compressor compatibility remains limited regarding windowLog < 18 */ +size_t ZSTD_checkCParams_advanced(ZSTD_compressionParameters cParams, U64 srcSize) +{ + if (srcSize > (1ULL << ZSTD_WINDOWLOG_MIN)) return ZSTD_checkCParams(cParams); + if (cParams.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) return ERROR(compressionParameter_unsupported); + if (srcSize <= (1ULL << cParams.windowLog)) cParams.windowLog = ZSTD_WINDOWLOG_MIN; /* fake value - temporary work around */ + if (srcSize <= (1ULL << cParams.chainLog)) cParams.chainLog = ZSTD_CHAINLOG_MIN; /* fake value - temporary work around */ + if ((srcSize <= (1ULL << cParams.hashLog)) && ((U32)cParams.strategy < (U32)ZSTD_btlazy2)) cParams.hashLog = ZSTD_HASHLOG_MIN; /* fake value - temporary work around */ + return ZSTD_checkCParams(cParams); +} + + +/** ZSTD_adjustCParams() : + optimize cPar for a given input (`srcSize` and `dictSize`). + mostly downsizing to reduce memory consumption and initialization. + Both `srcSize` and `dictSize` are optional (use 0 if unknown), + but if both are 0, no optimization can be done. + Note : cPar is considered validated at this stage. Use ZSTD_checkParams() to ensure that. */ +ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize) +{ + if (srcSize+dictSize == 0) return cPar; /* no size information available : no adjustment */ + + /* resize params, to use less memory when necessary */ + { U32 const minSrcSize = (srcSize==0) ? 500 : 0; + U64 const rSize = srcSize + dictSize + minSrcSize; + if (rSize < ((U64)1< srcLog) cPar.windowLog = srcLog; + } } + if (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog; + { U32 const btPlus = (cPar.strategy == ZSTD_btlazy2) || (cPar.strategy == ZSTD_btopt); + U32 const maxChainLog = cPar.windowLog+btPlus; + if (cPar.chainLog > maxChainLog) cPar.chainLog = maxChainLog; } /* <= ZSTD_CHAINLOG_MAX */ + + if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */ + if ((cPar.hashLog < ZSTD_HASHLOG_MIN) && ( (U32)cPar.strategy >= (U32)ZSTD_btlazy2)) cPar.hashLog = ZSTD_HASHLOG_MIN; /* required to ensure collision resistance in bt */ + + return cPar; +} + + +size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams) +{ + const size_t blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog); + const U32 divider = (cParams.searchLength==3) ? 3 : 4; + const size_t maxNbSeq = blockSize / divider; + const size_t tokenSpace = blockSize + 11*maxNbSeq; + + const size_t chainSize = (cParams.strategy == ZSTD_fast) ? 0 : (1 << cParams.chainLog); + const size_t hSize = ((size_t)1) << cParams.hashLog; + const U32 hashLog3 = (cParams.searchLength>3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, cParams.windowLog); + const size_t h3Size = ((size_t)1) << hashLog3; + const size_t tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); + + size_t const optSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<3) ? 0 : MIN(ZSTD_HASHLOG3_MAX, params.cParams.windowLog); + const size_t h3Size = ((size_t)1) << hashLog3; + const size_t tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); + + /* Check if workSpace is large enough, alloc a new one if needed */ + { size_t const optSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<workSpaceSize < neededSpace) { + zc->customMem.customFree(zc->customMem.opaque, zc->workSpace); + zc->workSpace = zc->customMem.customAlloc(zc->customMem.opaque, neededSpace); + if (zc->workSpace == NULL) return ERROR(memory_allocation); + zc->workSpaceSize = neededSpace; + } } + + if (reset) memset(zc->workSpace, 0, tableSpace ); /* reset only tables */ + XXH64_reset(&zc->xxhState, 0); + zc->hashLog3 = hashLog3; + zc->hashTable = (U32*)(zc->workSpace); + zc->chainTable = zc->hashTable + hSize; + zc->hashTable3 = zc->chainTable + chainSize; + zc->seqStore.buffer = zc->hashTable3 + h3Size; + zc->hufTable = (HUF_CElt*)zc->seqStore.buffer; + zc->flagStaticTables = 0; + zc->seqStore.buffer = ((U32*)(zc->seqStore.buffer)) + 256; /* note : HUF_CElt* is incomplete type, size is simulated using U32 */ + + zc->nextToUpdate = 1; + zc->nextSrc = NULL; + zc->base = NULL; + zc->dictBase = NULL; + zc->dictLimit = 0; + zc->lowLimit = 0; + zc->params = params; + zc->blockSize = blockSize; + zc->frameContentSize = frameContentSize; + { int i; for (i=0; irep[i] = repStartValue[i]; } + + if (params.cParams.strategy == ZSTD_btopt) { + zc->seqStore.litFreq = (U32*)(zc->seqStore.buffer); + zc->seqStore.litLengthFreq = zc->seqStore.litFreq + (1<seqStore.matchLengthFreq = zc->seqStore.litLengthFreq + (MaxLL+1); + zc->seqStore.offCodeFreq = zc->seqStore.matchLengthFreq + (MaxML+1); + zc->seqStore.buffer = zc->seqStore.offCodeFreq + (MaxOff+1); + zc->seqStore.matchTable = (ZSTD_match_t*)zc->seqStore.buffer; + zc->seqStore.buffer = zc->seqStore.matchTable + ZSTD_OPT_NUM+1; + zc->seqStore.priceTable = (ZSTD_optimal_t*)zc->seqStore.buffer; + zc->seqStore.buffer = zc->seqStore.priceTable + ZSTD_OPT_NUM+1; + zc->seqStore.litLengthSum = 0; + } + zc->seqStore.offsetStart = (U32*)(zc->seqStore.buffer); + zc->seqStore.buffer = zc->seqStore.offsetStart + maxNbSeq; + zc->seqStore.litLengthStart = (U16*)zc->seqStore.buffer; + zc->seqStore.matchLengthStart = zc->seqStore.litLengthStart + maxNbSeq; + zc->seqStore.llCodeStart = (BYTE*) (zc->seqStore.matchLengthStart + maxNbSeq); + zc->seqStore.mlCodeStart = zc->seqStore.llCodeStart + maxNbSeq; + zc->seqStore.offCodeStart = zc->seqStore.mlCodeStart + maxNbSeq; + zc->seqStore.litStart = zc->seqStore.offCodeStart + maxNbSeq; + + zc->stage = 1; + zc->dictID = 0; + zc->loadedDictEnd = 0; + + return 0; +} + + +/*! ZSTD_copyCCtx() : +* Duplicate an existing context `srcCCtx` into another one `dstCCtx`. +* Only works during stage 1 (i.e. after creation, but before first call to ZSTD_compressContinue()). +* @return : 0, or an error code */ +size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx) +{ + if (srcCCtx->stage!=1) return ERROR(stage_wrong); + + memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem)); + ZSTD_resetCCtx_advanced(dstCCtx, srcCCtx->params, srcCCtx->frameContentSize, 0); + dstCCtx->params.fParams.contentSizeFlag = 0; /* content size different from the one set during srcCCtx init */ + + /* copy tables */ + { const size_t chainSize = (srcCCtx->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << srcCCtx->params.cParams.chainLog); + const size_t hSize = ((size_t)1) << srcCCtx->params.cParams.hashLog; + const size_t h3Size = (size_t)1 << srcCCtx->hashLog3; + const size_t tableSpace = (chainSize + hSize + h3Size) * sizeof(U32); + memcpy(dstCCtx->workSpace, srcCCtx->workSpace, tableSpace); + } + + /* copy dictionary offsets */ + dstCCtx->nextToUpdate = srcCCtx->nextToUpdate; + dstCCtx->nextToUpdate3= srcCCtx->nextToUpdate3; + dstCCtx->nextSrc = srcCCtx->nextSrc; + dstCCtx->base = srcCCtx->base; + dstCCtx->dictBase = srcCCtx->dictBase; + dstCCtx->dictLimit = srcCCtx->dictLimit; + dstCCtx->lowLimit = srcCCtx->lowLimit; + dstCCtx->loadedDictEnd= srcCCtx->loadedDictEnd; + dstCCtx->dictID = srcCCtx->dictID; + + /* copy entropy tables */ + dstCCtx->flagStaticTables = srcCCtx->flagStaticTables; + if (srcCCtx->flagStaticTables) { + memcpy(dstCCtx->hufTable, srcCCtx->hufTable, 256*4); + memcpy(dstCCtx->litlengthCTable, srcCCtx->litlengthCTable, sizeof(dstCCtx->litlengthCTable)); + memcpy(dstCCtx->matchlengthCTable, srcCCtx->matchlengthCTable, sizeof(dstCCtx->matchlengthCTable)); + memcpy(dstCCtx->offcodeCTable, srcCCtx->offcodeCTable, sizeof(dstCCtx->offcodeCTable)); + } + + return 0; +} + + +/*! ZSTD_reduceTable() : +* reduce table indexes by `reducerValue` */ +static void ZSTD_reduceTable (U32* const table, U32 const size, U32 const reducerValue) +{ + U32 u; + for (u=0 ; u < size ; u++) { + if (table[u] < reducerValue) table[u] = 0; + else table[u] -= reducerValue; + } +} + +/*! ZSTD_reduceIndex() : +* rescale all indexes to avoid future overflow (indexes are U32) */ +static void ZSTD_reduceIndex (ZSTD_CCtx* zc, const U32 reducerValue) +{ + { const U32 hSize = 1 << zc->params.cParams.hashLog; + ZSTD_reduceTable(zc->hashTable, hSize, reducerValue); } + + { const U32 chainSize = (zc->params.cParams.strategy == ZSTD_fast) ? 0 : (1 << zc->params.cParams.chainLog); + ZSTD_reduceTable(zc->chainTable, chainSize, reducerValue); } + + { const U32 h3Size = (zc->hashLog3) ? 1 << zc->hashLog3 : 0; + ZSTD_reduceTable(zc->hashTable3, h3Size, reducerValue); } +} + + +/*-******************************************************* +* Block entropic compression +*********************************************************/ + +/* Frame format description + Frame Header - [ Block Header - Block ] - Frame End + 1) Frame Header + - 4 bytes : Magic Number : ZSTD_MAGICNUMBER (defined within zstd_static.h) + - 1 byte : Frame Header Descriptor + - 1-13 bytes : Optional fields + 2) Block Header + - 3 bytes, starting with a 2-bits descriptor + Uncompressed, Compressed, Frame End, unused + 3) Block + See Block Format Description + 4) Frame End + - 3 bytes, compatible with Block Header +*/ + + +/* Frame header : + + 1 byte - FrameHeaderDescription : + bit 0-1 : dictID (0, 1, 2 or 4 bytes) + bit 2-4 : reserved (must be zero) + bit 5 : SkippedWindowLog (if 1, WindowLog byte is not present) + bit 6-7 : FrameContentFieldsize (0, 2, 4, or 8) + if (SkippedWindowLog && !FrameContentFieldsize) FrameContentFieldsize=1; + + Optional : WindowLog (0 or 1 byte) + bit 0-2 : octal Fractional (1/8th) + bit 3-7 : Power of 2, with 0 = 1 KB (up to 2 TB) + + Optional : content size (0, 1, 2, 4 or 8 bytes) + 0 : unknown + 1 : 0-255 bytes + 2 : 256 - 65535+256 + 8 : up to 16 exa + + Optional : dictID (0, 1, 2 or 4 bytes) + Automatic adaptation + 0 : no dictID + 1 : 1 - 255 + 2 : 256 - 65535 + 4 : all other values +*/ + + +/* Block format description + + Block = Literals Section - Sequences Section + Prerequisite : size of (compressed) block, maximum size of regenerated data + + 1) Literal Section + + 1.1) Header : 1-5 bytes + flags: 2 bits + 00 compressed by Huff0 + 01 repeat + 10 is Raw (uncompressed) + 11 is Rle + Note : using 01 => Huff0 with precomputed table ? + Note : delta map ? => compressed ? + + 1.1.1) Huff0-compressed literal block : 3-5 bytes + srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream + srcSize < 1 KB => 3 bytes (2-2-10-10) + srcSize < 16KB => 4 bytes (2-2-14-14) + else => 5 bytes (2-2-18-18) + big endian convention + + 1.1.2) Raw (uncompressed) literal block header : 1-3 bytes + size : 5 bits: (IS_RAW<<6) + (0<<4) + size + 12 bits: (IS_RAW<<6) + (2<<4) + (size>>8) + size&255 + 20 bits: (IS_RAW<<6) + (3<<4) + (size>>16) + size>>8&255 + size&255 + + 1.1.3) Rle (repeated single byte) literal block header : 1-3 bytes + size : 5 bits: (IS_RLE<<6) + (0<<4) + size + 12 bits: (IS_RLE<<6) + (2<<4) + (size>>8) + size&255 + 20 bits: (IS_RLE<<6) + (3<<4) + (size>>16) + size>>8&255 + size&255 + + 1.1.4) Huff0-compressed literal block, using precomputed CTables : 3-5 bytes + srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream + srcSize < 1 KB => 3 bytes (2-2-10-10) + srcSize < 16KB => 4 bytes (2-2-14-14) + else => 5 bytes (2-2-18-18) + big endian convention + + 1- CTable available (stored into workspace) + 2- Small input (fast heuristic ? Full comparison ? depend on clevel ?) + + + 1.2) Literal block content + + 1.2.1) Huff0 block, using sizes from header + See Huff0 format + + 1.2.2) Huff0 block, using prepared table + + 1.2.3) Raw content + + 1.2.4) single byte + + + 2) Sequences section + + - Nb Sequences : 2 bytes, little endian + - Control Token : 1 byte (see below) + - Dumps Length : 1 or 2 bytes (depending on control token) + - Dumps : as stated by dumps length + - Literal Lengths FSE table (as needed depending on encoding method) + - Offset Codes FSE table (as needed depending on encoding method) + - Match Lengths FSE table (as needed depending on encoding method) + + 2.1) Control Token + 8 bits, divided as : + 0-1 : dumpsLength + 2-3 : MatchLength, FSE encoding method + 4-5 : Offset Codes, FSE encoding method + 6-7 : Literal Lengths, FSE encoding method + + FSE encoding method : + FSE_ENCODING_RAW : uncompressed; no header + FSE_ENCODING_RLE : single repeated value; header 1 byte + FSE_ENCODING_STATIC : use prepared table; no header + FSE_ENCODING_DYNAMIC : read NCount +*/ + +size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + BYTE* const ostart = (BYTE* const)dst; + + if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall); + memcpy(ostart + ZSTD_blockHeaderSize, src, srcSize); + + /* Build header */ + ostart[0] = (BYTE)(srcSize>>16); + ostart[1] = (BYTE)(srcSize>>8); + ostart[2] = (BYTE) srcSize; + ostart[0] += (BYTE)(bt_raw<<6); /* is a raw (uncompressed) block */ + + return ZSTD_blockHeaderSize+srcSize; +} + + +static size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + BYTE* const ostart = (BYTE* const)dst; + U32 const flSize = 1 + (srcSize>31) + (srcSize>4095); + + if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall); + + switch(flSize) + { + case 1: /* 2 - 1 - 5 */ + ostart[0] = (BYTE)((lbt_raw<<6) + (0<<5) + srcSize); + break; + case 2: /* 2 - 2 - 12 */ + ostart[0] = (BYTE)((lbt_raw<<6) + (2<<4) + (srcSize >> 8)); + ostart[1] = (BYTE)srcSize; + break; + default: /*note : should not be necessary : flSize is within {1,2,3} */ + case 3: /* 2 - 2 - 20 */ + ostart[0] = (BYTE)((lbt_raw<<6) + (3<<4) + (srcSize >> 16)); + ostart[1] = (BYTE)(srcSize>>8); + ostart[2] = (BYTE)srcSize; + break; + } + + memcpy(ostart + flSize, src, srcSize); + return srcSize + flSize; +} + +static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + BYTE* const ostart = (BYTE* const)dst; + U32 const flSize = 1 + (srcSize>31) + (srcSize>4095); + + (void)dstCapacity; /* dstCapacity guaranteed to be >=4, hence large enough */ + + switch(flSize) + { + case 1: /* 2 - 1 - 5 */ + ostart[0] = (BYTE)((lbt_rle<<6) + (0<<5) + srcSize); + break; + case 2: /* 2 - 2 - 12 */ + ostart[0] = (BYTE)((lbt_rle<<6) + (2<<4) + (srcSize >> 8)); + ostart[1] = (BYTE)srcSize; + break; + default: /*note : should not be necessary : flSize is necessarily within {1,2,3} */ + case 3: /* 2 - 2 - 20 */ + ostart[0] = (BYTE)((lbt_rle<<6) + (3<<4) + (srcSize >> 16)); + ostart[1] = (BYTE)(srcSize>>8); + ostart[2] = (BYTE)srcSize; + break; + } + + ostart[flSize] = *(const BYTE*)src; + return flSize+1; +} + + +static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; } + +static size_t ZSTD_compressLiterals (ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + size_t const minGain = ZSTD_minGain(srcSize); + size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB); + BYTE* const ostart = (BYTE*)dst; + U32 singleStream = srcSize < 256; + litBlockType_t hType = lbt_huffman; + size_t cLitSize; + + + /* small ? don't even attempt compression (speed opt) */ +# define LITERAL_NOENTROPY 63 + { size_t const minLitSize = zc->flagStaticTables ? 6 : LITERAL_NOENTROPY; + if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); + } + + if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */ + if (zc->flagStaticTables && (lhSize==3)) { + hType = lbt_repeat; + singleStream = 1; + cLitSize = HUF_compress1X_usingCTable(ostart+lhSize, dstCapacity-lhSize, src, srcSize, zc->hufTable); + } else { + cLitSize = singleStream ? HUF_compress1X(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11) + : HUF_compress2 (ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11); + } + + if ((cLitSize==0) | (cLitSize >= srcSize - minGain)) + return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); + if (cLitSize==1) + return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize); + + /* Build header */ + switch(lhSize) + { + case 3: /* 2 - 2 - 10 - 10 */ + ostart[0] = (BYTE)((srcSize>>6) + (singleStream << 4) + (hType<<6)); + ostart[1] = (BYTE)((srcSize<<2) + (cLitSize>>8)); + ostart[2] = (BYTE)(cLitSize); + break; + case 4: /* 2 - 2 - 14 - 14 */ + ostart[0] = (BYTE)((srcSize>>10) + (2<<4) + (hType<<6)); + ostart[1] = (BYTE)(srcSize>> 2); + ostart[2] = (BYTE)((srcSize<<6) + (cLitSize>>8)); + ostart[3] = (BYTE)(cLitSize); + break; + default: /* should not be necessary, lhSize is only {3,4,5} */ + case 5: /* 2 - 2 - 18 - 18 */ + ostart[0] = (BYTE)((srcSize>>14) + (3<<4) + (hType<<6)); + ostart[1] = (BYTE)(srcSize>>6); + ostart[2] = (BYTE)((srcSize<<2) + (cLitSize>>16)); + ostart[3] = (BYTE)(cLitSize>>8); + ostart[4] = (BYTE)(cLitSize); + break; + } + return lhSize+cLitSize; +} + + +void ZSTD_seqToCodes(const seqStore_t* seqStorePtr, size_t const nbSeq) +{ + /* LL codes */ + { static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 16, 17, 17, 18, 18, 19, 19, + 20, 20, 20, 20, 21, 21, 21, 21, + 22, 22, 22, 22, 22, 22, 22, 22, + 23, 23, 23, 23, 23, 23, 23, 23, + 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24 }; + const BYTE LL_deltaCode = 19; + const U16* const llTable = seqStorePtr->litLengthStart; + BYTE* const llCodeTable = seqStorePtr->llCodeStart; + size_t u; + for (u=0; u63) ? (BYTE)ZSTD_highbit32(ll) + LL_deltaCode : LL_Code[ll]; + } + if (seqStorePtr->longLengthID==1) + llCodeTable[seqStorePtr->longLengthPos] = MaxLL; + } + + /* Offset codes */ + { const U32* const offsetTable = seqStorePtr->offsetStart; + BYTE* const ofCodeTable = seqStorePtr->offCodeStart; + size_t u; + for (u=0; umatchLengthStart; + BYTE* const mlCodeTable = seqStorePtr->mlCodeStart; + size_t u; + for (u=0; u127) ? (BYTE)ZSTD_highbit32(ml) + ML_deltaCode : ML_Code[ml]; + } + if (seqStorePtr->longLengthID==2) + mlCodeTable[seqStorePtr->longLengthPos] = MaxML; + } +} + + +size_t ZSTD_compressSequences(ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + size_t srcSize) +{ + const seqStore_t* seqStorePtr = &(zc->seqStore); + U32 count[MaxSeq+1]; + S16 norm[MaxSeq+1]; + FSE_CTable* CTable_LitLength = zc->litlengthCTable; + FSE_CTable* CTable_OffsetBits = zc->offcodeCTable; + FSE_CTable* CTable_MatchLength = zc->matchlengthCTable; + U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */ + U16* const llTable = seqStorePtr->litLengthStart; + U16* const mlTable = seqStorePtr->matchLengthStart; + const U32* const offsetTable = seqStorePtr->offsetStart; + const U32* const offsetTableEnd = seqStorePtr->offset; + BYTE* const ofCodeTable = seqStorePtr->offCodeStart; + BYTE* const llCodeTable = seqStorePtr->llCodeStart; + BYTE* const mlCodeTable = seqStorePtr->mlCodeStart; + BYTE* const ostart = (BYTE*)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart; + size_t const nbSeq = offsetTableEnd - offsetTable; + BYTE* seqHead; + + /* Compress literals */ + { const BYTE* const literals = seqStorePtr->litStart; + size_t const litSize = seqStorePtr->lit - literals; + size_t const cSize = ZSTD_compressLiterals(zc, op, dstCapacity, literals, litSize); + if (ZSTD_isError(cSize)) return cSize; + op += cSize; + } + + /* Sequences Header */ + if ((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead */) return ERROR(dstSize_tooSmall); + if (nbSeq < 0x7F) *op++ = (BYTE)nbSeq; + else if (nbSeq < LONGNBSEQ) op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2; + else op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3; + if (nbSeq==0) goto _check_compressibility; + + /* seqHead : flags for FSE encoding type */ + seqHead = op++; + +#define MIN_SEQ_FOR_DYNAMIC_FSE 64 +#define MAX_SEQ_FOR_STATIC_FSE 1000 + + /* convert length/distances into codes */ + ZSTD_seqToCodes(seqStorePtr, nbSeq); + + /* CTable for Literal Lengths */ + { U32 max = MaxLL; + size_t const mostFrequent = FSE_countFast(count, &max, llCodeTable, nbSeq); + if ((mostFrequent == nbSeq) && (nbSeq > 2)) { + *op++ = llCodeTable[0]; + FSE_buildCTable_rle(CTable_LitLength, (BYTE)max); + LLtype = FSE_ENCODING_RLE; + } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { + LLtype = FSE_ENCODING_STATIC; + } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (LL_defaultNormLog-1)))) { + FSE_buildCTable(CTable_LitLength, LL_defaultNorm, MaxLL, LL_defaultNormLog); + LLtype = FSE_ENCODING_RAW; + } else { + size_t nbSeq_1 = nbSeq; + const U32 tableLog = FSE_optimalTableLog(LLFSELog, nbSeq, max); + if (count[llCodeTable[nbSeq-1]]>1) { count[llCodeTable[nbSeq-1]]--; nbSeq_1--; } + FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); + { size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */ + if (FSE_isError(NCountSize)) return ERROR(GENERIC); + op += NCountSize; } + FSE_buildCTable(CTable_LitLength, norm, max, tableLog); + LLtype = FSE_ENCODING_DYNAMIC; + } } + + /* CTable for Offsets */ + { U32 max = MaxOff; + size_t const mostFrequent = FSE_countFast(count, &max, ofCodeTable, nbSeq); + if ((mostFrequent == nbSeq) && (nbSeq > 2)) { + *op++ = ofCodeTable[0]; + FSE_buildCTable_rle(CTable_OffsetBits, (BYTE)max); + Offtype = FSE_ENCODING_RLE; + } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { + Offtype = FSE_ENCODING_STATIC; + } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (OF_defaultNormLog-1)))) { + FSE_buildCTable(CTable_OffsetBits, OF_defaultNorm, MaxOff, OF_defaultNormLog); + Offtype = FSE_ENCODING_RAW; + } else { + size_t nbSeq_1 = nbSeq; + const U32 tableLog = FSE_optimalTableLog(OffFSELog, nbSeq, max); + if (count[ofCodeTable[nbSeq-1]]>1) { count[ofCodeTable[nbSeq-1]]--; nbSeq_1--; } + FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); + { size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */ + if (FSE_isError(NCountSize)) return ERROR(GENERIC); + op += NCountSize; } + FSE_buildCTable(CTable_OffsetBits, norm, max, tableLog); + Offtype = FSE_ENCODING_DYNAMIC; + } } + + /* CTable for MatchLengths */ + { U32 max = MaxML; + size_t const mostFrequent = FSE_countFast(count, &max, mlCodeTable, nbSeq); + if ((mostFrequent == nbSeq) && (nbSeq > 2)) { + *op++ = *mlCodeTable; + FSE_buildCTable_rle(CTable_MatchLength, (BYTE)max); + MLtype = FSE_ENCODING_RLE; + } else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) { + MLtype = FSE_ENCODING_STATIC; + } else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (ML_defaultNormLog-1)))) { + FSE_buildCTable(CTable_MatchLength, ML_defaultNorm, MaxML, ML_defaultNormLog); + MLtype = FSE_ENCODING_RAW; + } else { + size_t nbSeq_1 = nbSeq; + const U32 tableLog = FSE_optimalTableLog(MLFSELog, nbSeq, max); + if (count[mlCodeTable[nbSeq-1]]>1) { count[mlCodeTable[nbSeq-1]]--; nbSeq_1--; } + FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max); + { size_t const NCountSize = FSE_writeNCount(op, oend-op, norm, max, tableLog); /* overflow protected */ + if (FSE_isError(NCountSize)) return ERROR(GENERIC); + op += NCountSize; } + FSE_buildCTable(CTable_MatchLength, norm, max, tableLog); + MLtype = FSE_ENCODING_DYNAMIC; + } } + + *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2)); + zc->flagStaticTables = 0; + + /* Encoding Sequences */ + { BIT_CStream_t blockStream; + FSE_CState_t stateMatchLength; + FSE_CState_t stateOffsetBits; + FSE_CState_t stateLitLength; + + { size_t const errorCode = BIT_initCStream(&blockStream, op, oend-op); + if (ERR_isError(errorCode)) return ERROR(dstSize_tooSmall); } /* not enough space remaining */ + + /* first symbols */ + FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]); + FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]); + FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]); + BIT_addBits(&blockStream, llTable[nbSeq-1], LL_bits[llCodeTable[nbSeq-1]]); + if (MEM_32bits()) BIT_flushBits(&blockStream); + BIT_addBits(&blockStream, mlTable[nbSeq-1], ML_bits[mlCodeTable[nbSeq-1]]); + if (MEM_32bits()) BIT_flushBits(&blockStream); + BIT_addBits(&blockStream, offsetTable[nbSeq-1], ofCodeTable[nbSeq-1]); + BIT_flushBits(&blockStream); + + { size_t n; + for (n=nbSeq-2 ; n= 64-7-(LLFSELog+MLFSELog+OffFSELog))) + BIT_flushBits(&blockStream); /* (7)*/ + BIT_addBits(&blockStream, llTable[n], llBits); + if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream); + BIT_addBits(&blockStream, mlTable[n], mlBits); + if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/ + BIT_addBits(&blockStream, offsetTable[n], ofBits); /* 31 */ + BIT_flushBits(&blockStream); /* (7)*/ + } } + + FSE_flushCState(&blockStream, &stateMatchLength); + FSE_flushCState(&blockStream, &stateOffsetBits); + FSE_flushCState(&blockStream, &stateLitLength); + + { size_t const streamSize = BIT_closeCStream(&blockStream); + if (streamSize==0) return ERROR(dstSize_tooSmall); /* not enough space */ + op += streamSize; + } } + + /* check compressibility */ +_check_compressibility: + { size_t const minGain = ZSTD_minGain(srcSize); + size_t const maxCSize = srcSize - minGain; + if ((size_t)(op-ostart) >= maxCSize) return 0; } + + /* confirm repcodes */ + { int i; for (i=0; irep[i] = zc->savedRep[i]; } + + return op - ostart; +} + + +/*! ZSTD_storeSeq() : + Store a sequence (literal length, literals, offset code and match length code) into seqStore_t. + `offsetCode` : distance to match, or 0 == repCode. + `matchCode` : matchLength - MINMATCH +*/ +MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const void* literals, U32 offsetCode, size_t matchCode) +{ +#if 0 /* for debug */ + static const BYTE* g_start = NULL; + const U32 pos = (U32)(literals - g_start); + if (g_start==NULL) g_start = literals; + //if ((pos > 1) && (pos < 50000)) + printf("Cpos %6u :%5u literals & match %3u bytes at distance %6u \n", + pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode); +#endif + ZSTD_statsUpdatePrices(&seqStorePtr->stats, litLength, (const BYTE*)literals, offsetCode, matchCode); /* debug only */ + + /* copy Literals */ + ZSTD_wildcopy(seqStorePtr->lit, literals, litLength); + seqStorePtr->lit += litLength; + + /* literal Length */ + if (litLength>0xFFFF) { seqStorePtr->longLengthID = 1; seqStorePtr->longLengthPos = (U32)(seqStorePtr->litLength - seqStorePtr->litLengthStart); } + *seqStorePtr->litLength++ = (U16)litLength; + + /* match offset */ + *(seqStorePtr->offset++) = offsetCode + 1; + + /* match Length */ + if (matchCode>0xFFFF) { seqStorePtr->longLengthID = 2; seqStorePtr->longLengthPos = (U32)(seqStorePtr->matchLength - seqStorePtr->matchLengthStart); } + *seqStorePtr->matchLength++ = (U16)matchCode; +} + + +/*-************************************* +* Match length counter +***************************************/ +static unsigned ZSTD_NbCommonBytes (register size_t val) +{ + if (MEM_isLittleEndian()) { + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) + unsigned long r = 0; + _BitScanForward64( &r, (U64)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_ctzll((U64)val) >> 3); +# else + static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 }; + return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58]; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r=0; + _BitScanForward( &r, (U32)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_ctz((U32)val) >> 3); +# else + static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 }; + return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27]; +# endif + } + } else { /* Big Endian CPU */ + if (MEM_64bits()) { +# if defined(_MSC_VER) && defined(_WIN64) + unsigned long r = 0; + _BitScanReverse64( &r, val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_clzll(val) >> 3); +# else + unsigned r; + const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */ + if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; } + if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } + r += (!val); + return r; +# endif + } else { /* 32 bits */ +# if defined(_MSC_VER) + unsigned long r = 0; + _BitScanReverse( &r, (unsigned long)val ); + return (unsigned)(r>>3); +# elif defined(__GNUC__) && (__GNUC__ >= 3) + return (__builtin_clz((U32)val) >> 3); +# else + unsigned r; + if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } + r += (!val); + return r; +# endif + } } +} + + +static size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* const pInLimit) +{ + const BYTE* const pStart = pIn; + const BYTE* const pInLoopLimit = pInLimit - (sizeof(size_t)-1); + + while (pIn < pInLoopLimit) { + size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn); + if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; } + pIn += ZSTD_NbCommonBytes(diff); + return (size_t)(pIn - pStart); + } + if (MEM_64bits()) if ((pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; } + if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; } + if ((pIn> (32-h) ; } +MEM_STATIC size_t ZSTD_hash3Ptr(const void* ptr, U32 h) { return ZSTD_hash3(MEM_readLE32(ptr), h); } /* only in zstd_opt.h */ + +static const U32 prime4bytes = 2654435761U; +static U32 ZSTD_hash4(U32 u, U32 h) { return (u * prime4bytes) >> (32-h) ; } +static size_t ZSTD_hash4Ptr(const void* ptr, U32 h) { return ZSTD_hash4(MEM_read32(ptr), h); } + +static const U64 prime5bytes = 889523592379ULL; +static size_t ZSTD_hash5(U64 u, U32 h) { return (size_t)(((u << (64-40)) * prime5bytes) >> (64-h)) ; } +static size_t ZSTD_hash5Ptr(const void* p, U32 h) { return ZSTD_hash5(MEM_readLE64(p), h); } + +static const U64 prime6bytes = 227718039650203ULL; +static size_t ZSTD_hash6(U64 u, U32 h) { return (size_t)(((u << (64-48)) * prime6bytes) >> (64-h)) ; } +static size_t ZSTD_hash6Ptr(const void* p, U32 h) { return ZSTD_hash6(MEM_readLE64(p), h); } + +static const U64 prime7bytes = 58295818150454627ULL; +static size_t ZSTD_hash7(U64 u, U32 h) { return (size_t)(((u << (64-56)) * prime7bytes) >> (64-h)) ; } +static size_t ZSTD_hash7Ptr(const void* p, U32 h) { return ZSTD_hash7(MEM_readLE64(p), h); } + +//static const U64 prime8bytes = 58295818150454627ULL; +static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL; +static size_t ZSTD_hash8(U64 u, U32 h) { return (size_t)(((u) * prime8bytes) >> (64-h)) ; } +static size_t ZSTD_hash8Ptr(const void* p, U32 h) { return ZSTD_hash8(MEM_readLE64(p), h); } + +static size_t ZSTD_hashPtr(const void* p, U32 hBits, U32 mls) +{ + switch(mls) + { + default: + case 4: return ZSTD_hash4Ptr(p, hBits); + case 5: return ZSTD_hash5Ptr(p, hBits); + case 6: return ZSTD_hash6Ptr(p, hBits); + case 7: return ZSTD_hash7Ptr(p, hBits); + case 8: return ZSTD_hash8Ptr(p, hBits); + } +} + + +/*-************************************* +* Fast Scan +***************************************/ +static void ZSTD_fillHashTable (ZSTD_CCtx* zc, const void* end, const U32 mls) +{ + U32* const hashTable = zc->hashTable; + const U32 hBits = zc->params.cParams.hashLog; + const BYTE* const base = zc->base; + const BYTE* ip = base + zc->nextToUpdate; + const BYTE* const iend = ((const BYTE*)end) - 8; + const size_t fastHashFillStep = 3; + + while(ip <= iend) { + hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip - base); + ip += fastHashFillStep; + } +} + + +FORCE_INLINE +void ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx, + const void* src, size_t srcSize, + const U32 mls) +{ + U32* const hashTable = cctx->hashTable; + const U32 hBits = cctx->params.cParams.hashLog; + seqStore_t* seqStorePtr = &(cctx->seqStore); + const BYTE* const base = cctx->base; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 lowestIndex = cctx->dictLimit; + const BYTE* const lowest = base + lowestIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + U32 offset_1=cctx->rep[0], offset_2=cctx->rep[1]; + U32 offsetSaved = 0; + + /* init */ + ip += (ip==lowest); + { U32 const maxRep = (U32)(ip-lowest); + if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; + if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; + } + + /* Main Search Loop */ + while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ + size_t mLength; + size_t const h = ZSTD_hashPtr(ip, hBits, mls); + U32 const current = (U32)(ip-base); + U32 const matchIndex = hashTable[h]; + const BYTE* match = base + matchIndex; + hashTable[h] = current; /* update hash table */ + + if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) { /* note : by construction, offset_1 <= current */ + mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4; + ip++; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH); + } else { + U32 offset; + if ( (matchIndex <= lowestIndex) || (MEM_read32(match) != MEM_read32(ip)) ) { + ip += ((ip-anchor) >> g_searchStrength) + 1; + continue; + } + mLength = ZSTD_count(ip+4, match+4, iend) + 4; + offset = (U32)(ip-match); + while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + offset_2 = offset_1; + offset_1 = offset; + + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } + + /* match found */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Fill Table */ + hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2; /* here because current+2 could be > iend-8 */ + hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base); + /* check immediate repcode */ + while ( (ip <= ilimit) + && ( (offset_2>0) + & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) { + /* store sequence */ + size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4; + { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */ + hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip-base); + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength-MINMATCH); + ip += rLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } } } + + /* save reps for next block */ + cctx->savedRep[0] = offset_1 ? offset_1 : offsetSaved; + cctx->savedRep[1] = offset_2 ? offset_2 : offsetSaved; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +static void ZSTD_compressBlock_fast(ZSTD_CCtx* ctx, + const void* src, size_t srcSize) +{ + const U32 mls = ctx->params.cParams.searchLength; + switch(mls) + { + default: + case 4 : + ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 4); return; + case 5 : + ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 5); return; + case 6 : + ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 6); return; + case 7 : + ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 7); return; + } +} + + +static void ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize, + const U32 mls) +{ + U32* hashTable = ctx->hashTable; + const U32 hBits = ctx->params.cParams.hashLog; + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const base = ctx->base; + const BYTE* const dictBase = ctx->dictBase; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 lowestIndex = ctx->lowLimit; + const BYTE* const dictStart = dictBase + lowestIndex; + const U32 dictLimit = ctx->dictLimit; + const BYTE* const lowPrefixPtr = base + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + U32 offset_1=ctx->rep[0], offset_2=ctx->rep[1]; + + /* Search Loop */ + while (ip < ilimit) { /* < instead of <=, because (ip+1) */ + const size_t h = ZSTD_hashPtr(ip, hBits, mls); + const U32 matchIndex = hashTable[h]; + const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base; + const BYTE* match = matchBase + matchIndex; + const U32 current = (U32)(ip-base); + const U32 repIndex = current + 1 - offset_1; /* offset_1 expected <= current +1 */ + const BYTE* repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* repMatch = repBase + repIndex; + size_t mLength; + hashTable[h] = current; /* update hash table */ + + if ( (((U32)((dictLimit-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex)) + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repMatchEnd, lowPrefixPtr) + EQUAL_READ32; + ip++; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH); + } else { + if ( (matchIndex < lowestIndex) || + (MEM_read32(match) != MEM_read32(ip)) ) { + ip += ((ip-anchor) >> g_searchStrength) + 1; + continue; + } + { const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend; + const BYTE* lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr; + U32 offset; + mLength = ZSTD_count_2segments(ip+EQUAL_READ32, match+EQUAL_READ32, iend, matchEnd, lowPrefixPtr) + EQUAL_READ32; + while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + offset = current - matchIndex; + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } } + + /* found a match : store it */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Fill Table */ + hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2; + hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base); + /* check immediate repcode */ + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2; + if ( (((U32)((dictLimit-1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */ + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend; + size_t repLength2 = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch2+EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32; + U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2-MINMATCH); + hashTable[ZSTD_hashPtr(ip, hBits, mls)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } } } + + /* save reps for next block */ + ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +static void ZSTD_compressBlock_fast_extDict(ZSTD_CCtx* ctx, + const void* src, size_t srcSize) +{ + const U32 mls = ctx->params.cParams.searchLength; + switch(mls) + { + default: + case 4 : + ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 4); return; + case 5 : + ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 5); return; + case 6 : + ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 6); return; + case 7 : + ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 7); return; + } +} + + +/*-************************************* +* Double Fast +***************************************/ +static void ZSTD_fillDoubleHashTable (ZSTD_CCtx* cctx, const void* end, const U32 mls) +{ + U32* const hashLarge = cctx->hashTable; + const U32 hBitsL = cctx->params.cParams.hashLog; + U32* const hashSmall = cctx->chainTable; + const U32 hBitsS = cctx->params.cParams.chainLog; + const BYTE* const base = cctx->base; + const BYTE* ip = base + cctx->nextToUpdate; + const BYTE* const iend = ((const BYTE*)end) - 8; + const size_t fastHashFillStep = 3; + + while(ip <= iend) { + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip - base); + hashLarge[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip - base); + ip += fastHashFillStep; + } +} + + +FORCE_INLINE +void ZSTD_compressBlock_doubleFast_generic(ZSTD_CCtx* cctx, + const void* src, size_t srcSize, + const U32 mls) +{ + U32* const hashLong = cctx->hashTable; + const U32 hBitsL = cctx->params.cParams.hashLog; + U32* const hashSmall = cctx->chainTable; + const U32 hBitsS = cctx->params.cParams.chainLog; + seqStore_t* seqStorePtr = &(cctx->seqStore); + const BYTE* const base = cctx->base; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 lowestIndex = cctx->dictLimit; + const BYTE* const lowest = base + lowestIndex; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + U32 offset_1=cctx->rep[0], offset_2=cctx->rep[1]; + U32 offsetSaved = 0; + + /* init */ + ip += (ip==lowest); + { U32 const maxRep = (U32)(ip-lowest); + if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0; + if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0; + } + + /* Main Search Loop */ + while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */ + size_t mLength; + size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8); + size_t const h = ZSTD_hashPtr(ip, hBitsS, mls); + U32 const current = (U32)(ip-base); + U32 const matchIndexL = hashLong[h2]; + U32 const matchIndexS = hashSmall[h]; + const BYTE* matchLong = base + matchIndexL; + const BYTE* match = base + matchIndexS; + hashLong[h2] = hashSmall[h] = current; /* update hash tables */ + + if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) { /* note : by construction, offset_1 <= current */ + mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4; + ip++; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH); + } else { + U32 offset; + if ( (matchIndexL > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip)) ) { + mLength = ZSTD_count(ip+8, matchLong+8, iend) + 8; + offset = (U32)(ip-matchLong); + while (((ip>anchor) & (matchLong>lowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ + } else if ( (matchIndexS > lowestIndex) && (MEM_read32(match) == MEM_read32(ip)) ) { + mLength = ZSTD_count(ip+4, match+4, iend) + 4; + offset = (U32)(ip-match); + while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + } else { + ip += ((ip-anchor) >> g_searchStrength) + 1; + continue; + } + + offset_2 = offset_1; + offset_1 = offset; + + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } + + /* match found */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Fill Table */ + hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] = + hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2; /* here because current+2 could be > iend-8 */ + hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = + hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base); + + /* check immediate repcode */ + while ( (ip <= ilimit) + && ( (offset_2>0) + & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) { + /* store sequence */ + size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4; + { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */ + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base); + hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base); + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength-MINMATCH); + ip += rLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } } } + + /* save reps for next block */ + cctx->savedRep[0] = offset_1 ? offset_1 : offsetSaved; + cctx->savedRep[1] = offset_2 ? offset_2 : offsetSaved; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +static void ZSTD_compressBlock_doubleFast(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + const U32 mls = ctx->params.cParams.searchLength; + switch(mls) + { + default: + case 4 : + ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 4); return; + case 5 : + ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 5); return; + case 6 : + ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 6); return; + case 7 : + ZSTD_compressBlock_doubleFast_generic(ctx, src, srcSize, 7); return; + } +} + + +static void ZSTD_compressBlock_doubleFast_extDict_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize, + const U32 mls) +{ + U32* const hashLong = ctx->hashTable; + const U32 hBitsL = ctx->params.cParams.hashLog; + U32* const hashSmall = ctx->chainTable; + const U32 hBitsS = ctx->params.cParams.chainLog; + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const base = ctx->base; + const BYTE* const dictBase = ctx->dictBase; + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const U32 lowestIndex = ctx->lowLimit; + const BYTE* const dictStart = dictBase + lowestIndex; + const U32 dictLimit = ctx->dictLimit; + const BYTE* const lowPrefixPtr = base + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + U32 offset_1=ctx->rep[0], offset_2=ctx->rep[1]; + + /* Search Loop */ + while (ip < ilimit) { /* < instead of <=, because (ip+1) */ + const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls); + const U32 matchIndex = hashSmall[hSmall]; + const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base; + const BYTE* match = matchBase + matchIndex; + + const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8); + const U32 matchLongIndex = hashLong[hLong]; + const BYTE* matchLongBase = matchLongIndex < dictLimit ? dictBase : base; + const BYTE* matchLong = matchLongBase + matchLongIndex; + + const U32 current = (U32)(ip-base); + const U32 repIndex = current + 1 - offset_1; /* offset_1 expected <= current +1 */ + const BYTE* repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* repMatch = repBase + repIndex; + size_t mLength; + hashSmall[hSmall] = hashLong[hLong] = current; /* update hash table */ + + if ( (((U32)((dictLimit-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex)) + && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { + const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, lowPrefixPtr) + 4; + ip++; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH); + } else { + if ((matchLongIndex > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) { + const BYTE* matchEnd = matchLongIndex < dictLimit ? dictEnd : iend; + const BYTE* lowMatchPtr = matchLongIndex < dictLimit ? dictStart : lowPrefixPtr; + U32 offset; + mLength = ZSTD_count_2segments(ip+8, matchLong+8, iend, matchEnd, lowPrefixPtr) + 8; + offset = current - matchLongIndex; + while (((ip>anchor) & (matchLong>lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */ + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } else if ((matchIndex > lowestIndex) && (MEM_read32(match) == MEM_read32(ip))) { + const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend; + const BYTE* lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr; + U32 offset; + mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, lowPrefixPtr) + 4; + while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ + offset = current - matchIndex; + offset_2 = offset_1; + offset_1 = offset; + ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH); + } else { + ip += ((ip-anchor) >> g_searchStrength) + 1; + continue; + } } + + /* found a match : store it */ + ip += mLength; + anchor = ip; + + if (ip <= ilimit) { + /* Fill Table */ + hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2; + hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] = current+2; + hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base); + hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base); + /* check immediate repcode */ + while (ip <= ilimit) { + U32 const current2 = (U32)(ip-base); + U32 const repIndex2 = current2 - offset_2; + const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2; + if ( (((U32)((dictLimit-1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */ + && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { + const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend; + size_t const repLength2 = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch2+EQUAL_READ32, iend, repEnd2, lowPrefixPtr) + EQUAL_READ32; + U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2-MINMATCH); + hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2; + hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2; + ip += repLength2; + anchor = ip; + continue; + } + break; + } } } + + /* save reps for next block */ + ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +static void ZSTD_compressBlock_doubleFast_extDict(ZSTD_CCtx* ctx, + const void* src, size_t srcSize) +{ + const U32 mls = ctx->params.cParams.searchLength; + switch(mls) + { + default: + case 4 : + ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 4); return; + case 5 : + ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 5); return; + case 6 : + ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 6); return; + case 7 : + ZSTD_compressBlock_doubleFast_extDict_generic(ctx, src, srcSize, 7); return; + } +} + + +/*-************************************* +* Binary Tree search +***************************************/ +/** ZSTD_insertBt1() : add one or multiple positions to tree. +* ip : assumed <= iend-8 . +* @return : nb of positions added */ +static U32 ZSTD_insertBt1(ZSTD_CCtx* zc, const BYTE* const ip, const U32 mls, const BYTE* const iend, U32 nbCompares, + U32 extDict) +{ + U32* const hashTable = zc->hashTable; + const U32 hashLog = zc->params.cParams.hashLog; + const size_t h = ZSTD_hashPtr(ip, hashLog, mls); + U32* const bt = zc->chainTable; + const U32 btLog = zc->params.cParams.chainLog - 1; + const U32 btMask= (1 << btLog) - 1; + U32 matchIndex = hashTable[h]; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const base = zc->base; + const BYTE* const dictBase = zc->dictBase; + const U32 dictLimit = zc->dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* match = base + matchIndex; + const U32 current = (U32)(ip-base); + const U32 btLow = btMask >= current ? 0 : current - btMask; + U32* smallerPtr = bt + 2*(current&btMask); + U32* largerPtr = smallerPtr + 1; + U32 dummy32; /* to be nullified at the end */ + const U32 windowLow = zc->lowLimit; + U32 matchEndIdx = current+8; + size_t bestLength = 8; +#ifdef ZSTD_C_PREDICT + U32 predictedSmall = *(bt + 2*((current-1)&btMask) + 0); + U32 predictedLarge = *(bt + 2*((current-1)&btMask) + 1); + predictedSmall += (predictedSmall>0); + predictedLarge += (predictedLarge>0); +#endif /* ZSTD_C_PREDICT */ + + hashTable[h] = current; /* Update Hash Table */ + + while (nbCompares-- && (matchIndex > windowLow)) { + U32* nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ +#ifdef ZSTD_C_PREDICT /* note : can create issues when hlog small <= 11 */ + const U32* predictPtr = bt + 2*((matchIndex-1) & btMask); /* written this way, as bt is a roll buffer */ + if (matchIndex == predictedSmall) { + /* no need to check length, result known */ + *smallerPtr = matchIndex; + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + predictedSmall = predictPtr[1] + (predictPtr[1]>0); + continue; + } + if (matchIndex == predictedLarge) { + *largerPtr = matchIndex; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + predictedLarge = predictPtr[0] + (predictPtr[0]>0); + continue; + } +#endif + if ((!extDict) || (matchIndex+matchLength >= dictLimit)) { + match = base + matchIndex; + if (match[matchLength] == ip[matchLength]) + matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iend) +1; + } else { + match = dictBase + matchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ + } + + if (matchLength > bestLength) { + bestLength = matchLength; + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + } + + if (ip+matchLength == iend) /* equal : no way to know if inf or sup */ + break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt the tree */ + + if (match[matchLength] < ip[matchLength]) { /* necessarily within correct buffer */ + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + if (bestLength > 384) return MIN(192, (U32)(bestLength - 384)); /* speed optimization */ + if (matchEndIdx > current + 8) return matchEndIdx - current - 8; + return 1; +} + + +static size_t ZSTD_insertBtAndFindBestMatch ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iend, + size_t* offsetPtr, + U32 nbCompares, const U32 mls, + U32 extDict) +{ + U32* const hashTable = zc->hashTable; + const U32 hashLog = zc->params.cParams.hashLog; + const size_t h = ZSTD_hashPtr(ip, hashLog, mls); + U32* const bt = zc->chainTable; + const U32 btLog = zc->params.cParams.chainLog - 1; + const U32 btMask= (1 << btLog) - 1; + U32 matchIndex = hashTable[h]; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const base = zc->base; + const BYTE* const dictBase = zc->dictBase; + const U32 dictLimit = zc->dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const U32 current = (U32)(ip-base); + const U32 btLow = btMask >= current ? 0 : current - btMask; + const U32 windowLow = zc->lowLimit; + U32* smallerPtr = bt + 2*(current&btMask); + U32* largerPtr = bt + 2*(current&btMask) + 1; + U32 matchEndIdx = current+8; + U32 dummy32; /* to be nullified at the end */ + size_t bestLength = 0; + + hashTable[h] = current; /* Update Hash Table */ + + while (nbCompares-- && (matchIndex > windowLow)) { + U32* nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + const BYTE* match; + + if ((!extDict) || (matchIndex+matchLength >= dictLimit)) { + match = base + matchIndex; + if (match[matchLength] == ip[matchLength]) + matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iend) +1; + } else { + match = dictBase + matchIndex; + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ + } + + if (matchLength > bestLength) { + if (matchLength > matchEndIdx - matchIndex) + matchEndIdx = matchIndex + (U32)matchLength; + if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(current-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) + bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + current - matchIndex; + if (ip+matchLength == iend) /* equal : no way to know if inf or sup */ + break; /* drop, to guarantee consistency (miss a little bit of compression) */ + } + + if (match[matchLength] < ip[matchLength]) { + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + + zc->nextToUpdate = (matchEndIdx > current + 8) ? matchEndIdx - 8 : current+1; + return bestLength; +} + + +static void ZSTD_updateTree(ZSTD_CCtx* zc, const BYTE* const ip, const BYTE* const iend, const U32 nbCompares, const U32 mls) +{ + const BYTE* const base = zc->base; + const U32 target = (U32)(ip - base); + U32 idx = zc->nextToUpdate; + + while(idx < target) + idx += ZSTD_insertBt1(zc, base+idx, mls, iend, nbCompares, 0); +} + +/** ZSTD_BtFindBestMatch() : Tree updater, providing best match */ +static size_t ZSTD_BtFindBestMatch ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 mls) +{ + if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls); + return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 0); +} + + +static size_t ZSTD_BtFindBestMatch_selectMLS ( + ZSTD_CCtx* zc, /* Index table will be updated */ + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 matchLengthSearch) +{ + switch(matchLengthSearch) + { + default : + case 4 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4); + case 5 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5); + case 6 : return ZSTD_BtFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6); + } +} + + +static void ZSTD_updateTree_extDict(ZSTD_CCtx* zc, const BYTE* const ip, const BYTE* const iend, const U32 nbCompares, const U32 mls) +{ + const BYTE* const base = zc->base; + const U32 target = (U32)(ip - base); + U32 idx = zc->nextToUpdate; + + while (idx < target) idx += ZSTD_insertBt1(zc, base+idx, mls, iend, nbCompares, 1); +} + + +/** Tree updater, providing best match */ +static size_t ZSTD_BtFindBestMatch_extDict ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 mls) +{ + if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls); + return ZSTD_insertBtAndFindBestMatch(zc, ip, iLimit, offsetPtr, maxNbAttempts, mls, 1); +} + + +static size_t ZSTD_BtFindBestMatch_selectMLS_extDict ( + ZSTD_CCtx* zc, /* Index table will be updated */ + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 matchLengthSearch) +{ + switch(matchLengthSearch) + { + default : + case 4 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4); + case 5 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5); + case 6 : return ZSTD_BtFindBestMatch_extDict(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6); + } +} + + + +/* *********************** +* Hash Chain +*************************/ + +#define NEXT_IN_CHAIN(d, mask) chainTable[(d) & mask] + + +/* Update chains up to ip (excluded) + Assumption : always within prefix (ie. not within extDict) */ +FORCE_INLINE +U32 ZSTD_insertAndFindFirstIndex (ZSTD_CCtx* zc, const BYTE* ip, U32 mls) +{ + U32* const hashTable = zc->hashTable; + const U32 hashLog = zc->params.cParams.hashLog; + U32* const chainTable = zc->chainTable; + const U32 chainMask = (1 << zc->params.cParams.chainLog) - 1; + const BYTE* const base = zc->base; + const U32 target = (U32)(ip - base); + U32 idx = zc->nextToUpdate; + + while(idx < target) { /* catch up */ + size_t const h = ZSTD_hashPtr(base+idx, hashLog, mls); + NEXT_IN_CHAIN(idx, chainMask) = hashTable[h]; + hashTable[h] = idx; + idx++; + } + + zc->nextToUpdate = target; + return hashTable[ZSTD_hashPtr(ip, hashLog, mls)]; +} + + + +FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */ +size_t ZSTD_HcFindBestMatch_generic ( + ZSTD_CCtx* zc, /* Index table will be updated */ + const BYTE* const ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 mls, const U32 extDict) +{ + U32* const chainTable = zc->chainTable; + const U32 chainSize = (1 << zc->params.cParams.chainLog); + const U32 chainMask = chainSize-1; + const BYTE* const base = zc->base; + const BYTE* const dictBase = zc->dictBase; + const U32 dictLimit = zc->dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const U32 lowLimit = zc->lowLimit; + const U32 current = (U32)(ip-base); + const U32 minChain = current > chainSize ? current - chainSize : 0; + int nbAttempts=maxNbAttempts; + size_t ml=EQUAL_READ32-1; + + /* HC4 match finder */ + U32 matchIndex = ZSTD_insertAndFindFirstIndex (zc, ip, mls); + + for ( ; (matchIndex>lowLimit) & (nbAttempts>0) ; nbAttempts--) { + const BYTE* match; + size_t currentMl=0; + if ((!extDict) || matchIndex >= dictLimit) { + match = base + matchIndex; + if (match[ml] == ip[ml]) /* potentially better */ + currentMl = ZSTD_count(ip, match, iLimit); + } else { + match = dictBase + matchIndex; + if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+EQUAL_READ32, match+EQUAL_READ32, iLimit, dictEnd, prefixStart) + EQUAL_READ32; + } + + /* save best solution */ + if (currentMl > ml) { ml = currentMl; *offsetPtr = current - matchIndex + ZSTD_REP_MOVE; if (ip+currentMl == iLimit) break; /* best possible, and avoid read overflow*/ } + + if (matchIndex <= minChain) break; + matchIndex = NEXT_IN_CHAIN(matchIndex, chainMask); + } + + return ml; +} + + +FORCE_INLINE size_t ZSTD_HcFindBestMatch_selectMLS ( + ZSTD_CCtx* zc, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 matchLengthSearch) +{ + switch(matchLengthSearch) + { + default : + case 4 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 0); + case 5 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 0); + case 6 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 0); + } +} + + +FORCE_INLINE size_t ZSTD_HcFindBestMatch_extDict_selectMLS ( + ZSTD_CCtx* zc, + const BYTE* ip, const BYTE* const iLimit, + size_t* offsetPtr, + const U32 maxNbAttempts, const U32 matchLengthSearch) +{ + switch(matchLengthSearch) + { + default : + case 4 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 4, 1); + case 5 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 5, 1); + case 6 : return ZSTD_HcFindBestMatch_generic(zc, ip, iLimit, offsetPtr, maxNbAttempts, 6, 1); + } +} + + +/* ******************************* +* Common parser - lazy strategy +*********************************/ +FORCE_INLINE +void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize, + const U32 searchMethod, const U32 depth) +{ + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ctx->base + ctx->dictLimit; + + U32 const maxSearches = 1 << ctx->params.cParams.searchLog; + U32 const mls = ctx->params.cParams.searchLength; + + typedef size_t (*searchMax_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit, + size_t* offsetPtr, + U32 maxNbAttempts, U32 matchLengthSearch); + searchMax_f const searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS; + U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1], savedOffset=0; + + /* init */ + ip += (ip==base); + ctx->nextToUpdate3 = ctx->nextToUpdate; + { U32 const maxRep = (U32)(ip-base); + if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0; + if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0; + } + + /* Match Loop */ + while (ip < ilimit) { + size_t matchLength=0; + size_t offset=0; + const BYTE* start=ip+1; + + /* check repCode */ + if ((offset_1>0) & (MEM_read32(ip+1) == MEM_read32(ip+1 - offset_1))) { + /* repcode : we take it */ + matchLength = ZSTD_count(ip+1+EQUAL_READ32, ip+1+EQUAL_READ32-offset_1, iend) + EQUAL_READ32; + if (depth==0) goto _storeSequence; + } + + /* first search (depth 0) */ + { size_t offsetFound = 99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls); + if (ml2 > matchLength) + matchLength = ml2, start = ip, offset=offsetFound; + } + + if (matchLength < EQUAL_READ32) { + ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ + continue; + } + + /* let's try to find a better solution */ + if (depth>=1) + while (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { + size_t const mlRep = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_1, iend) + EQUAL_READ32; + int const gain2 = (int)(mlRep * 3); + int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); + if ((mlRep >= EQUAL_READ32) && (gain2 > gain1)) + matchLength = mlRep, offset = 0, start = ip; + } + { size_t offset2=99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); + if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; /* search a better one */ + } } + + /* let's find an even better one */ + if ((depth==2) && (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { + size_t const ml2 = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_1, iend) + EQUAL_READ32; + int const gain2 = (int)(ml2 * 4); + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); + if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) + matchLength = ml2, offset = 0, start = ip; + } + { size_t offset2=99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); + if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; + } } } + break; /* nothing found : store previous solution */ + } + + /* catch up */ + if (offset) { + while ((start>anchor) && (start>base+offset-ZSTD_REP_MOVE) && (start[-1] == start[-1-offset+ZSTD_REP_MOVE])) /* only search for offset within prefix */ + { start--; matchLength++; } + offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); + } + + /* store sequence */ +_storeSequence: + { size_t const litLength = start - anchor; + ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength-MINMATCH); + anchor = ip = start + matchLength; + } + + /* check immediate repcode */ + while ( (ip <= ilimit) + && ((offset_2>0) + & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) { + /* store sequence */ + matchLength = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-offset_2, iend) + EQUAL_READ32; + offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap repcodes */ + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH); + ip += matchLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } } + + /* Save reps for next block */ + ctx->savedRep[0] = offset_1 ? offset_1 : savedOffset; + ctx->savedRep[1] = offset_2 ? offset_2 : savedOffset; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + ZSTD_statsUpdatePrices(&seqStorePtr->stats, lastLLSize, anchor, 0, 0); + } +} + + +static void ZSTD_compressBlock_btlazy2(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 1, 2); +} + +static void ZSTD_compressBlock_lazy2(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 2); +} + +static void ZSTD_compressBlock_lazy(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 1); +} + +static void ZSTD_compressBlock_greedy(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 0); +} + + +FORCE_INLINE +void ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize, + const U32 searchMethod, const U32 depth) +{ + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ctx->base; + const U32 dictLimit = ctx->dictLimit; + const U32 lowestIndex = ctx->lowLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictBase = ctx->dictBase; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const dictStart = dictBase + ctx->lowLimit; + + const U32 maxSearches = 1 << ctx->params.cParams.searchLog; + const U32 mls = ctx->params.cParams.searchLength; + + typedef size_t (*searchMax_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit, + size_t* offsetPtr, + U32 maxNbAttempts, U32 matchLengthSearch); + searchMax_f searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS_extDict : ZSTD_HcFindBestMatch_extDict_selectMLS; + + U32 offset_1 = ctx->rep[0], offset_2 = ctx->rep[1]; + + /* init */ + ctx->nextToUpdate3 = ctx->nextToUpdate; + ip += (ip == prefixStart); + + /* Match Loop */ + while (ip < ilimit) { + size_t matchLength=0; + size_t offset=0; + const BYTE* start=ip+1; + U32 current = (U32)(ip-base); + + /* check repCode */ + { const U32 repIndex = (U32)(current+1 - offset_1); + const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ + if (MEM_read32(ip+1) == MEM_read32(repMatch)) { + /* repcode detected we should take it */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+1+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; + if (depth==0) goto _storeSequence; + } } + + /* first search (depth 0) */ + { size_t offsetFound = 99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls); + if (ml2 > matchLength) + matchLength = ml2, start = ip, offset=offsetFound; + } + + if (matchLength < EQUAL_READ32) { + ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ + continue; + } + + /* let's try to find a better solution */ + if (depth>=1) + while (ip= 3) & (repIndex > lowestIndex)) /* intentional overflow */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + size_t const repLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; + int const gain2 = (int)(repLength * 3); + int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); + if ((repLength >= EQUAL_READ32) && (gain2 > gain1)) + matchLength = repLength, offset = 0, start = ip; + } } + + /* search match, depth 1 */ + { size_t offset2=99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); + if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; /* search a better one */ + } } + + /* let's find an even better one */ + if ((depth==2) && (ip= 3) & (repIndex > lowestIndex)) /* intentional overflow */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + size_t repLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; + int gain2 = (int)(repLength * 4); + int gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); + if ((repLength >= EQUAL_READ32) && (gain2 > gain1)) + matchLength = repLength, offset = 0, start = ip; + } } + + /* search match, depth 2 */ + { size_t offset2=99999999; + size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); + int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ + int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); + if ((ml2 >= EQUAL_READ32) && (gain2 > gain1)) { + matchLength = ml2, offset = offset2, start = ip; + continue; + } } } + break; /* nothing found : store previous solution */ + } + + /* catch up */ + if (offset) { + U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE)); + const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex; + const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart; + while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ + offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); + } + + /* store sequence */ +_storeSequence: + { size_t const litLength = start - anchor; + ZSTD_storeSeq(seqStorePtr, litLength, anchor, (U32)offset, matchLength-MINMATCH); + anchor = ip = start + matchLength; + } + + /* check immediate repcode */ + while (ip <= ilimit) { + const U32 repIndex = (U32)((ip-base) - offset_2); + const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; + const BYTE* const repMatch = repBase + repIndex; + if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */ + if (MEM_read32(ip) == MEM_read32(repMatch)) { + /* repcode detected we should take it */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + matchLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32; + offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset history */ + ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH); + ip += matchLength; + anchor = ip; + continue; /* faster when present ... (?) */ + } + break; + } } + + /* Save reps for next block */ + ctx->savedRep[0] = offset_1; ctx->savedRep[1] = offset_2; + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +void ZSTD_compressBlock_greedy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 0); +} + +static void ZSTD_compressBlock_lazy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 1); +} + +static void ZSTD_compressBlock_lazy2_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 2); +} + +static void ZSTD_compressBlock_btlazy2_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ + ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 1, 2); +} + + +/* The optimal parser */ +#include "zstd_opt.h" + +static void ZSTD_compressBlock_btopt(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ +#ifdef ZSTD_OPT_H_91842398743 + ZSTD_compressBlock_opt_generic(ctx, src, srcSize); +#else + (void)ctx; (void)src; (void)srcSize; + return; +#endif +} + +static void ZSTD_compressBlock_btopt_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize) +{ +#ifdef ZSTD_OPT_H_91842398743 + ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize); +#else + (void)ctx; (void)src; (void)srcSize; + return; +#endif +} + + +typedef void (*ZSTD_blockCompressor) (ZSTD_CCtx* ctx, const void* src, size_t srcSize); + +static ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int extDict) +{ + static const ZSTD_blockCompressor blockCompressor[2][7] = { + { ZSTD_compressBlock_fast, ZSTD_compressBlock_doubleFast, ZSTD_compressBlock_greedy, ZSTD_compressBlock_lazy, ZSTD_compressBlock_lazy2, ZSTD_compressBlock_btlazy2, ZSTD_compressBlock_btopt }, + { ZSTD_compressBlock_fast_extDict, ZSTD_compressBlock_doubleFast_extDict, ZSTD_compressBlock_greedy_extDict, ZSTD_compressBlock_lazy_extDict,ZSTD_compressBlock_lazy2_extDict, ZSTD_compressBlock_btlazy2_extDict, ZSTD_compressBlock_btopt_extDict } + }; + + return blockCompressor[extDict][(U32)strat]; +} + + +static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->params.cParams.strategy, zc->lowLimit < zc->dictLimit); + if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) return 0; /* don't even attempt compression below a certain srcSize */ + ZSTD_resetSeqStore(&(zc->seqStore)); + blockCompressor(zc, src, srcSize); + return ZSTD_compressSequences(zc, dst, dstCapacity, srcSize); +} + + + + +static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + size_t blockSize = cctx->blockSize; + size_t remaining = srcSize; + const BYTE* ip = (const BYTE*)src; + BYTE* const ostart = (BYTE*)dst; + BYTE* op = ostart; + const U32 maxDist = 1 << cctx->params.cParams.windowLog; + ZSTD_stats_t* stats = &cctx->seqStore.stats; + ZSTD_statsInit(stats); /* debug only */ + + if (cctx->params.fParams.checksumFlag) + XXH64_update(&cctx->xxhState, src, srcSize); + + while (remaining) { + size_t cSize; + ZSTD_statsResetFreqs(stats); /* debug only */ + + if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE) return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */ + if (remaining < blockSize) blockSize = remaining; + + if ((U32)(ip+blockSize - cctx->base) > cctx->loadedDictEnd + maxDist) { + /* enforce maxDist */ + U32 const newLowLimit = (U32)(ip+blockSize - cctx->base) - maxDist; + if (cctx->lowLimit < newLowLimit) cctx->lowLimit = newLowLimit; + if (cctx->dictLimit < cctx->lowLimit) cctx->dictLimit = cctx->lowLimit; + } + + cSize = ZSTD_compressBlock_internal(cctx, op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize, ip, blockSize); + if (ZSTD_isError(cSize)) return cSize; + + if (cSize == 0) { /* block is not compressible */ + cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize); + if (ZSTD_isError(cSize)) return cSize; + } else { + op[0] = (BYTE)(cSize>>16); + op[1] = (BYTE)(cSize>>8); + op[2] = (BYTE)cSize; + op[0] += (BYTE)(bt_compressed << 6); /* is a compressed block */ + cSize += 3; + } + + remaining -= blockSize; + dstCapacity -= cSize; + ip += blockSize; + op += cSize; + } + + ZSTD_statsPrint(stats, cctx->params.cParams.searchLength); + return op-ostart; +} + + +static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity, + ZSTD_parameters params, U64 pledgedSrcSize, U32 dictID) +{ BYTE* const op = (BYTE*)dst; + U32 const dictIDSizeCode = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */ + U32 const checksumFlag = params.fParams.checksumFlag>0; + U32 const windowSize = 1U << params.cParams.windowLog; + U32 const directModeFlag = params.fParams.contentSizeFlag && (windowSize > (pledgedSrcSize-1)); + BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3); + U32 const fcsCode = params.fParams.contentSizeFlag ? + (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : /* 0-3 */ + 0; + BYTE const frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (directModeFlag<<5) + (fcsCode<<6) ); + size_t pos; + + if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall); + + MEM_writeLE32(dst, ZSTD_MAGICNUMBER); + op[4] = frameHeaderDecriptionByte; pos=5; + if (!directModeFlag) op[pos++] = windowLogByte; + switch(dictIDSizeCode) + { + default: /* impossible */ + case 0 : break; + case 1 : op[pos] = (BYTE)(dictID); pos++; break; + case 2 : MEM_writeLE16(op+pos, (U16)(dictID)); pos+=2; break; + case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break; + } + switch(fcsCode) + { + default: /* impossible */ + case 0 : if (directModeFlag) op[pos++] = (BYTE)(pledgedSrcSize); break; + case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break; + case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break; + case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break; + } + return pos; +} + + +static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + U32 frame) +{ + const BYTE* const ip = (const BYTE*) src; + size_t fhSize = 0; + + if (zc->stage==0) return ERROR(stage_wrong); + if (frame && (zc->stage==1)) { /* copy saved header */ + fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, zc->params, zc->frameContentSize, zc->dictID); + if (ZSTD_isError(fhSize)) return fhSize; + dstCapacity -= fhSize; + dst = (char*)dst + fhSize; + zc->stage = 2; + } + + /* Check if blocks follow each other */ + if (src != zc->nextSrc) { + /* not contiguous */ + size_t const delta = zc->nextSrc - ip; + zc->lowLimit = zc->dictLimit; + zc->dictLimit = (U32)(zc->nextSrc - zc->base); + zc->dictBase = zc->base; + zc->base -= delta; + zc->nextToUpdate = zc->dictLimit; + if (zc->dictLimit - zc->lowLimit < 8) zc->lowLimit = zc->dictLimit; /* too small extDict */ + } + + /* preemptive overflow correction */ + if (zc->lowLimit > (1<<30)) { + U32 const btplus = (zc->params.cParams.strategy == ZSTD_btlazy2) | (zc->params.cParams.strategy == ZSTD_btopt); + U32 const chainMask = (1 << (zc->params.cParams.chainLog - btplus)) - 1; + U32 const newLowLimit = zc->lowLimit & chainMask; /* preserve position % chainSize */ + U32 const correction = zc->lowLimit - newLowLimit; + ZSTD_reduceIndex(zc, correction); + zc->base += correction; + zc->dictBase += correction; + zc->lowLimit = newLowLimit; + zc->dictLimit -= correction; + if (zc->nextToUpdate < correction) zc->nextToUpdate = 0; + else zc->nextToUpdate -= correction; + } + + /* if input and dictionary overlap : reduce dictionary (presumed modified by input) */ + if ((ip+srcSize > zc->dictBase + zc->lowLimit) && (ip < zc->dictBase + zc->dictLimit)) { + zc->lowLimit = (U32)(ip + srcSize - zc->dictBase); + if (zc->lowLimit > zc->dictLimit) zc->lowLimit = zc->dictLimit; + } + + zc->nextSrc = ip + srcSize; + { size_t const cSize = frame ? + ZSTD_compress_generic (zc, dst, dstCapacity, src, srcSize) : + ZSTD_compressBlock_internal (zc, dst, dstCapacity, src, srcSize); + if (ZSTD_isError(cSize)) return cSize; + return cSize + fhSize; + } +} + + +size_t ZSTD_compressContinue (ZSTD_CCtx* zc, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + return ZSTD_compressContinue_internal(zc, dst, dstCapacity, src, srcSize, 1); +} + + +size_t ZSTD_compressBlock(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + size_t const blockSizeMax = MIN (ZSTD_BLOCKSIZE_MAX, 1 << zc->params.cParams.windowLog); + if (srcSize > blockSizeMax) return ERROR(srcSize_wrong); + ZSTD_LOG_BLOCK("%p: ZSTD_compressBlock searchLength=%d\n", zc->base, zc->params.cParams.searchLength); + return ZSTD_compressContinue_internal(zc, dst, dstCapacity, src, srcSize, 0); +} + + +static size_t ZSTD_loadDictionaryContent(ZSTD_CCtx* zc, const void* src, size_t srcSize) +{ + const BYTE* const ip = (const BYTE*) src; + const BYTE* const iend = ip + srcSize; + + /* input becomes current prefix */ + zc->lowLimit = zc->dictLimit; + zc->dictLimit = (U32)(zc->nextSrc - zc->base); + zc->dictBase = zc->base; + zc->base += ip - zc->nextSrc; + zc->nextToUpdate = zc->dictLimit; + zc->loadedDictEnd = (U32)(iend - zc->base); + + zc->nextSrc = iend; + if (srcSize <= 8) return 0; + + switch(zc->params.cParams.strategy) + { + case ZSTD_fast: + ZSTD_fillHashTable (zc, iend, zc->params.cParams.searchLength); + break; + + case ZSTD_dfast: + ZSTD_fillDoubleHashTable (zc, iend, zc->params.cParams.searchLength); + break; + + case ZSTD_greedy: + case ZSTD_lazy: + case ZSTD_lazy2: + ZSTD_insertAndFindFirstIndex (zc, iend-8, zc->params.cParams.searchLength); + break; + + case ZSTD_btlazy2: + case ZSTD_btopt: + ZSTD_updateTree(zc, iend-8, iend, 1 << zc->params.cParams.searchLog, zc->params.cParams.searchLength); + break; + + default: + return ERROR(GENERIC); /* strategy doesn't exist; impossible */ + } + + zc->nextToUpdate = zc->loadedDictEnd; + return 0; +} + + +/* Dictionary format : + Magic == ZSTD_DICT_MAGIC (4 bytes) + HUF_writeCTable(256) + FSE_writeNCount(ml) + FSE_writeNCount(off) + FSE_writeNCount(ll) + RepOffsets + Dictionary content +*/ +/*! ZSTD_loadDictEntropyStats() : + @return : size read from dictionary + note : magic number supposed already checked */ +static size_t ZSTD_loadDictEntropyStats(ZSTD_CCtx* cctx, const void* dict, size_t dictSize) +{ + const BYTE* dictPtr = (const BYTE*)dict; + const BYTE* const dictEnd = dictPtr + dictSize; + + { size_t const hufHeaderSize = HUF_readCTable(cctx->hufTable, 255, dict, dictSize); + if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted); + dictPtr += hufHeaderSize; + } + + { short offcodeNCount[MaxOff+1]; + unsigned offcodeMaxValue = MaxOff, offcodeLog = OffFSELog; + size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildCTable(cctx->offcodeCTable, offcodeNCount, offcodeMaxValue, offcodeLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += offcodeHeaderSize; + } + + { short matchlengthNCount[MaxML+1]; + unsigned matchlengthMaxValue = MaxML, matchlengthLog = MLFSELog; + size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildCTable(cctx->matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += matchlengthHeaderSize; + } + + { short litlengthNCount[MaxLL+1]; + unsigned litlengthMaxValue = MaxLL, litlengthLog = LLFSELog; + size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildCTable(cctx->litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += litlengthHeaderSize; + } + + if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted); + cctx->rep[0] = MEM_readLE32(dictPtr+0); if (cctx->rep[0] >= dictSize) return ERROR(dictionary_corrupted); + cctx->rep[1] = MEM_readLE32(dictPtr+4); if (cctx->rep[1] >= dictSize) return ERROR(dictionary_corrupted); + cctx->rep[2] = MEM_readLE32(dictPtr+8); if (cctx->rep[2] >= dictSize) return ERROR(dictionary_corrupted); + dictPtr += 12; + + cctx->flagStaticTables = 1; + return dictPtr - (const BYTE*)dict; +} + +/** ZSTD_compress_insertDictionary() : +* @return : 0, or an error code */ +static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx* zc, const void* dict, size_t dictSize) +{ + if ((dict==NULL) || (dictSize<=8)) return 0; + + /* default : dict is pure content */ + if (MEM_readLE32(dict) != ZSTD_DICT_MAGIC) return ZSTD_loadDictionaryContent(zc, dict, dictSize); + zc->dictID = zc->params.fParams.noDictIDFlag ? 0 : MEM_readLE32((const char*)dict+4); + + /* known magic number : dict is parsed for entropy stats and content */ + { size_t const eSize = ZSTD_loadDictEntropyStats(zc, (const char*)dict+8 /* skip dictHeader */, dictSize-8) + 8; + if (ZSTD_isError(eSize)) return eSize; + return ZSTD_loadDictionaryContent(zc, (const char*)dict+eSize, dictSize-eSize); + } +} + + +/*! ZSTD_compressBegin_internal() : +* @return : 0, or an error code */ +static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* zc, + const void* dict, size_t dictSize, + ZSTD_parameters params, U64 pledgedSrcSize) +{ + size_t const resetError = ZSTD_resetCCtx_advanced(zc, params, pledgedSrcSize, 1); + if (ZSTD_isError(resetError)) return resetError; + + return ZSTD_compress_insertDictionary(zc, dict, dictSize); +} + + +/*! ZSTD_compressBegin_advanced() : +* @return : 0, or an error code */ +size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx, + const void* dict, size_t dictSize, + ZSTD_parameters params, unsigned long long pledgedSrcSize) +{ + /* compression parameters verification and optimization */ + { size_t const errorCode = ZSTD_checkCParams_advanced(params.cParams, pledgedSrcSize); + if (ZSTD_isError(errorCode)) return errorCode; } + + return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, pledgedSrcSize); +} + + +size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize); + ZSTD_LOG_BLOCK("%p: ZSTD_compressBegin_usingDict compressionLevel=%d\n", cctx->base, compressionLevel); + return ZSTD_compressBegin_internal(cctx, dict, dictSize, params, 0); +} + + +size_t ZSTD_compressBegin(ZSTD_CCtx* zc, int compressionLevel) +{ + ZSTD_LOG_BLOCK("%p: ZSTD_compressBegin compressionLevel=%d\n", zc->base, compressionLevel); + return ZSTD_compressBegin_usingDict(zc, NULL, 0, compressionLevel); +} + + +/*! ZSTD_compressEnd() : +* Write frame epilogue. +* @return : nb of bytes written into dst (or an error code) */ +size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity) +{ + BYTE* op = (BYTE*)dst; + size_t fhSize = 0; + + /* not even init ! */ + if (cctx->stage==0) return ERROR(stage_wrong); + + /* special case : empty frame */ + if (cctx->stage==1) { + fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->params, 0, 0); + if (ZSTD_isError(fhSize)) return fhSize; + dstCapacity -= fhSize; + op += fhSize; + cctx->stage = 2; + } + + /* frame epilogue */ + if (dstCapacity < 3) return ERROR(dstSize_tooSmall); + { U32 const checksum = cctx->params.fParams.checksumFlag ? + (U32)((XXH64_digest(&cctx->xxhState) >> 11) & ((1<<22)-1)) : + 0; + op[0] = (BYTE)((bt_end<<6) + (checksum>>16)); + op[1] = (BYTE)(checksum>>8); + op[2] = (BYTE)checksum; + } + + cctx->stage = 0; /* return to "created but not init" status */ + return 3+fhSize; +} + + +/*! ZSTD_compress_usingPreparedCCtx() : +* Same as ZSTD_compress_usingDict, but using a reference context `preparedCCtx`, where dictionary has been loaded. +* It avoids reloading the dictionary each time. +* `preparedCCtx` must have been properly initialized using ZSTD_compressBegin_usingDict() or ZSTD_compressBegin_advanced(). +* Requires 2 contexts : 1 for reference (preparedCCtx) which will not be modified, and 1 to run the compression operation (cctx) */ +static size_t ZSTD_compress_usingPreparedCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + { size_t const errorCode = ZSTD_copyCCtx(cctx, preparedCCtx); + if (ZSTD_isError(errorCode)) return errorCode; + } + { size_t const cSize = ZSTD_compressContinue(cctx, dst, dstCapacity, src, srcSize); + if (ZSTD_isError(cSize)) return cSize; + + { size_t const endSize = ZSTD_compressEnd(cctx, (char*)dst+cSize, dstCapacity-cSize); + if (ZSTD_isError(endSize)) return endSize; + return cSize + endSize; + } } +} + + +static size_t ZSTD_compress_internal (ZSTD_CCtx* ctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + ZSTD_parameters params) +{ + BYTE* const ostart = (BYTE*)dst; + BYTE* op = ostart; + + /* Init */ + { size_t const errorCode = ZSTD_compressBegin_internal(ctx, dict, dictSize, params, srcSize); + if(ZSTD_isError(errorCode)) return errorCode; } + + /* body (compression) */ + { size_t const oSize = ZSTD_compressContinue (ctx, op, dstCapacity, src, srcSize); + if(ZSTD_isError(oSize)) return oSize; + op += oSize; + dstCapacity -= oSize; } + + /* Close frame */ + { size_t const oSize = ZSTD_compressEnd(ctx, op, dstCapacity); + if(ZSTD_isError(oSize)) return oSize; + op += oSize; } + + return (op - ostart); +} + +size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize, + ZSTD_parameters params) +{ + size_t const errorCode = ZSTD_checkCParams_advanced(params.cParams, srcSize); + if (ZSTD_isError(errorCode)) return errorCode; + return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params); +} + +size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_parameters params = ZSTD_getParams(compressionLevel, srcSize, dictSize); + params.fParams.contentSizeFlag = 1; + ZSTD_LOG_BLOCK("%p: ZSTD_compress_usingDict srcSize=%d dictSize=%d compressionLevel=%d\n", ctx->base, (int)srcSize, (int)dictSize, compressionLevel); + return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params); +} + +size_t ZSTD_compressCCtx (ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel) +{ + ZSTD_LOG_BLOCK("%p: ZSTD_compressCCtx srcSize=%d compressionLevel=%d\n", ctx->base, (int)srcSize, compressionLevel); + return ZSTD_compress_usingDict(ctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel); +} + +size_t ZSTD_compress(void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel) +{ + size_t result; + ZSTD_CCtx ctxBody; + memset(&ctxBody, 0, sizeof(ctxBody)); + memcpy(&ctxBody.customMem, &defaultCustomMem, sizeof(ZSTD_customMem)); + result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel); + ctxBody.customMem.customFree(ctxBody.customMem.opaque, ctxBody.workSpace); /* can't free ctxBody, since it's on stack; just free heap content */ + return result; +} + + +/* ===== Dictionary API ===== */ + +struct ZSTD_CDict_s { + void* dictContent; + size_t dictContentSize; + ZSTD_CCtx* refContext; +}; /* typedef'd tp ZSTD_CDict within zstd.h */ + +ZSTD_CDict* ZSTD_createCDict_advanced(const void* dict, size_t dictSize, ZSTD_parameters params, ZSTD_customMem customMem) +{ + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) /* can't have 1/2 custom alloc/free as NULL */ + return NULL; + + { ZSTD_CDict* const cdict = (ZSTD_CDict*) customMem.customAlloc(customMem.opaque, sizeof(*cdict)); + void* const dictContent = customMem.customAlloc(customMem.opaque, dictSize); + ZSTD_CCtx* const cctx = ZSTD_createCCtx_advanced(customMem); + + if (!dictContent || !cdict || !cctx) { + customMem.customFree(customMem.opaque, dictContent); + customMem.customFree(customMem.opaque, cdict); + customMem.customFree(customMem.opaque, cctx); + return NULL; + } + + memcpy(dictContent, dict, dictSize); + { size_t const errorCode = ZSTD_compressBegin_advanced(cctx, dictContent, dictSize, params, 0); + if (ZSTD_isError(errorCode)) { + customMem.customFree(customMem.opaque, dictContent); + customMem.customFree(customMem.opaque, cdict); + customMem.customFree(customMem.opaque, cctx); + return NULL; + } } + + cdict->dictContent = dictContent; + cdict->dictContentSize = dictSize; + cdict->refContext = cctx; + return cdict; + } +} + +ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel) +{ + ZSTD_customMem const allocator = { NULL, NULL, NULL }; + ZSTD_parameters params; + memset(¶ms, 0, sizeof(params)); + params.cParams = ZSTD_getCParams(compressionLevel, 0, dictSize); + params.fParams.contentSizeFlag = 1; + return ZSTD_createCDict_advanced(dict, dictSize, params, allocator); +} + +size_t ZSTD_freeCDict(ZSTD_CDict* cdict) +{ + ZSTD_freeFunction const cFree = cdict->refContext->customMem.customFree; + void* const opaque = cdict->refContext->customMem.opaque; + ZSTD_freeCCtx(cdict->refContext); + cFree(opaque, cdict->dictContent); + cFree(opaque, cdict); + return 0; +} + +ZSTDLIB_API size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_CDict* cdict) +{ + return ZSTD_compress_usingPreparedCCtx(cctx, cdict->refContext, + dst, dstCapacity, + src, srcSize); +} + + + +/*-===== Pre-defined compression levels =====-*/ + +#define ZSTD_DEFAULT_CLEVEL 1 +#define ZSTD_MAX_CLEVEL 22 +unsigned ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; } + +static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = { +{ /* "default" */ + /* W, C, H, S, L, TL, strat */ + { 18, 12, 12, 1, 7, 16, ZSTD_fast }, /* level 0 - not used */ + { 19, 13, 14, 1, 7, 16, ZSTD_fast }, /* level 1 */ + { 19, 15, 16, 1, 6, 16, ZSTD_fast }, /* level 2 */ + { 20, 16, 18, 1, 5, 16, ZSTD_dfast }, /* level 3 */ + { 20, 13, 17, 2, 5, 16, ZSTD_greedy }, /* level 4.*/ + { 20, 15, 18, 3, 5, 16, ZSTD_greedy }, /* level 5 */ + { 21, 16, 19, 2, 5, 16, ZSTD_lazy }, /* level 6 */ + { 21, 17, 20, 3, 5, 16, ZSTD_lazy }, /* level 7 */ + { 21, 18, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 8.*/ + { 21, 20, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 9 */ + { 21, 19, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */ + { 22, 20, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */ + { 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */ + { 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 13 */ + { 22, 21, 22, 6, 5, 16, ZSTD_lazy2 }, /* level 14 */ + { 22, 21, 21, 5, 5, 16, ZSTD_btlazy2 }, /* level 15 */ + { 23, 22, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 16 */ + { 23, 23, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 17.*/ + { 23, 23, 22, 6, 5, 24, ZSTD_btopt }, /* level 18.*/ + { 23, 23, 22, 6, 3, 48, ZSTD_btopt }, /* level 19.*/ + { 25, 26, 23, 7, 3, 64, ZSTD_btopt }, /* level 20.*/ + { 26, 26, 23, 7, 3,256, ZSTD_btopt }, /* level 21.*/ + { 27, 27, 25, 9, 3,512, ZSTD_btopt }, /* level 22.*/ +}, +{ /* for srcSize <= 256 KB */ + /* W, C, H, S, L, T, strat */ + { 18, 12, 12, 1, 7, 4, ZSTD_fast }, /* level 0 - not used */ + { 18, 13, 14, 1, 6, 4, ZSTD_fast }, /* level 1 */ + { 18, 15, 17, 1, 5, 4, ZSTD_fast }, /* level 2 */ + { 18, 13, 15, 1, 5, 4, ZSTD_greedy }, /* level 3.*/ + { 18, 15, 17, 1, 5, 4, ZSTD_greedy }, /* level 4.*/ + { 18, 16, 17, 4, 5, 4, ZSTD_greedy }, /* level 5 */ + { 18, 17, 17, 5, 5, 4, ZSTD_greedy }, /* level 6 */ + { 18, 17, 17, 4, 4, 4, ZSTD_lazy }, /* level 7 */ + { 18, 17, 17, 4, 4, 4, ZSTD_lazy2 }, /* level 8 */ + { 18, 17, 17, 5, 4, 4, ZSTD_lazy2 }, /* level 9 */ + { 18, 17, 17, 6, 4, 4, ZSTD_lazy2 }, /* level 10 */ + { 18, 18, 17, 6, 4, 4, ZSTD_lazy2 }, /* level 11.*/ + { 18, 18, 17, 7, 4, 4, ZSTD_lazy2 }, /* level 12.*/ + { 18, 19, 17, 7, 4, 4, ZSTD_btlazy2 }, /* level 13 */ + { 18, 18, 18, 4, 4, 16, ZSTD_btopt }, /* level 14.*/ + { 18, 18, 18, 8, 4, 24, ZSTD_btopt }, /* level 15.*/ + { 18, 19, 18, 8, 3, 48, ZSTD_btopt }, /* level 16.*/ + { 18, 19, 18, 8, 3, 96, ZSTD_btopt }, /* level 17.*/ + { 18, 19, 18, 9, 3,128, ZSTD_btopt }, /* level 18.*/ + { 18, 19, 18, 10, 3,256, ZSTD_btopt }, /* level 19.*/ + { 18, 19, 18, 11, 3,512, ZSTD_btopt }, /* level 20.*/ + { 18, 19, 18, 12, 3,512, ZSTD_btopt }, /* level 21.*/ + { 18, 19, 18, 13, 3,512, ZSTD_btopt }, /* level 22.*/ +}, +{ /* for srcSize <= 128 KB */ + /* W, C, H, S, L, T, strat */ + { 17, 12, 12, 1, 7, 4, ZSTD_fast }, /* level 0 - not used */ + { 17, 12, 13, 1, 6, 4, ZSTD_fast }, /* level 1 */ + { 17, 13, 16, 1, 5, 4, ZSTD_fast }, /* level 2 */ + { 17, 13, 14, 2, 5, 4, ZSTD_greedy }, /* level 3 */ + { 17, 13, 15, 3, 4, 4, ZSTD_greedy }, /* level 4 */ + { 17, 15, 17, 4, 4, 4, ZSTD_greedy }, /* level 5 */ + { 17, 16, 17, 3, 4, 4, ZSTD_lazy }, /* level 6 */ + { 17, 15, 17, 4, 4, 4, ZSTD_lazy2 }, /* level 7 */ + { 17, 17, 17, 4, 4, 4, ZSTD_lazy2 }, /* level 8 */ + { 17, 17, 17, 5, 4, 4, ZSTD_lazy2 }, /* level 9 */ + { 17, 17, 17, 6, 4, 4, ZSTD_lazy2 }, /* level 10 */ + { 17, 17, 17, 7, 4, 4, ZSTD_lazy2 }, /* level 11 */ + { 17, 17, 17, 8, 4, 4, ZSTD_lazy2 }, /* level 12 */ + { 17, 18, 17, 6, 4, 4, ZSTD_btlazy2 }, /* level 13.*/ + { 17, 17, 17, 7, 3, 8, ZSTD_btopt }, /* level 14.*/ + { 17, 17, 17, 7, 3, 16, ZSTD_btopt }, /* level 15.*/ + { 17, 18, 17, 7, 3, 32, ZSTD_btopt }, /* level 16.*/ + { 17, 18, 17, 7, 3, 64, ZSTD_btopt }, /* level 17.*/ + { 17, 18, 17, 7, 3,256, ZSTD_btopt }, /* level 18.*/ + { 17, 18, 17, 8, 3,256, ZSTD_btopt }, /* level 19.*/ + { 17, 18, 17, 9, 3,256, ZSTD_btopt }, /* level 20.*/ + { 17, 18, 17, 10, 3,256, ZSTD_btopt }, /* level 21.*/ + { 17, 18, 17, 11, 3,256, ZSTD_btopt }, /* level 22.*/ +}, +{ /* for srcSize <= 16 KB */ + /* W, C, H, S, L, T, strat */ + { 14, 12, 12, 1, 7, 6, ZSTD_fast }, /* level 0 - not used */ + { 14, 14, 14, 1, 7, 6, ZSTD_fast }, /* level 1 */ + { 14, 14, 14, 1, 4, 6, ZSTD_fast }, /* level 2 */ + { 14, 14, 14, 1, 4, 6, ZSTD_dfast }, /* level 3.*/ + { 14, 14, 14, 4, 4, 6, ZSTD_greedy }, /* level 4.*/ + { 14, 14, 14, 3, 4, 6, ZSTD_lazy }, /* level 5.*/ + { 14, 14, 14, 4, 4, 6, ZSTD_lazy2 }, /* level 6 */ + { 14, 14, 14, 5, 4, 6, ZSTD_lazy2 }, /* level 7 */ + { 14, 14, 14, 6, 4, 6, ZSTD_lazy2 }, /* level 8.*/ + { 14, 15, 14, 6, 4, 6, ZSTD_btlazy2 }, /* level 9.*/ + { 14, 15, 14, 3, 3, 6, ZSTD_btopt }, /* level 10.*/ + { 14, 15, 14, 6, 3, 8, ZSTD_btopt }, /* level 11.*/ + { 14, 15, 14, 6, 3, 16, ZSTD_btopt }, /* level 12.*/ + { 14, 15, 14, 6, 3, 24, ZSTD_btopt }, /* level 13.*/ + { 14, 15, 15, 6, 3, 48, ZSTD_btopt }, /* level 14.*/ + { 14, 15, 15, 6, 3, 64, ZSTD_btopt }, /* level 15.*/ + { 14, 15, 15, 6, 3, 96, ZSTD_btopt }, /* level 16.*/ + { 14, 15, 15, 6, 3,128, ZSTD_btopt }, /* level 17.*/ + { 14, 15, 15, 6, 3,256, ZSTD_btopt }, /* level 18.*/ + { 14, 15, 15, 7, 3,256, ZSTD_btopt }, /* level 19.*/ + { 14, 15, 15, 8, 3,256, ZSTD_btopt }, /* level 20.*/ + { 14, 15, 15, 9, 3,256, ZSTD_btopt }, /* level 21.*/ + { 14, 15, 15, 10, 3,256, ZSTD_btopt }, /* level 22.*/ +}, +}; + +/*! ZSTD_getCParams() : +* @return ZSTD_compressionParameters structure for a selected compression level, `srcSize` and `dictSize`. +* Size values are optional, provide 0 if not known or unused */ +ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSize, size_t dictSize) +{ + ZSTD_compressionParameters cp; + size_t const addedSize = srcSize ? 0 : 500; + U64 const rSize = srcSize+dictSize ? srcSize+dictSize+addedSize : (U64)-1; + U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */ + if (compressionLevel <= 0) compressionLevel = ZSTD_DEFAULT_CLEVEL; /* 0 == default; no negative compressionLevel yet */ + if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL; + cp = ZSTD_defaultCParameters[tableID][compressionLevel]; + if (MEM_32bits()) { /* auto-correction, for 32-bits mode */ + if (cp.windowLog > ZSTD_WINDOWLOG_MAX) cp.windowLog = ZSTD_WINDOWLOG_MAX; + if (cp.chainLog > ZSTD_CHAINLOG_MAX) cp.chainLog = ZSTD_CHAINLOG_MAX; + if (cp.hashLog > ZSTD_HASHLOG_MAX) cp.hashLog = ZSTD_HASHLOG_MAX; + } + cp = ZSTD_adjustCParams(cp, srcSize, dictSize); + return cp; +} + +/*! ZSTD_getParams() : +* same as ZSTD_getCParams(), but @return a `ZSTD_parameters` object (instead of `ZSTD_compressionParameters`). +* All fields of `ZSTD_frameParameters` are set to default (0) */ +ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize, size_t dictSize) { + ZSTD_parameters params; + ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSize, dictSize); + memset(¶ms, 0, sizeof(params)); + params.cParams = cParams; + return params; +} diff --git a/uppsrc/plugin/zstd/compress/zstd_opt.h b/uppsrc/plugin/zstd/compress/zstd_opt.h new file mode 100644 index 000000000..ef394f198 --- /dev/null +++ b/uppsrc/plugin/zstd/compress/zstd_opt.h @@ -0,0 +1,1046 @@ +/* + ZSTD Optimal mode + Copyright (C) 2016, Przemyslaw Skibinski, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - Zstd source repository : https://www.zstd.net +*/ + +/* Note : this file is intended to be included within zstd_compress.c */ + + +#ifndef ZSTD_OPT_H_91842398743 +#define ZSTD_OPT_H_91842398743 + + +#define ZSTD_FREQ_DIV 5 + +/*-************************************* +* Price functions for optimal parser +***************************************/ +FORCE_INLINE void ZSTD_setLog2Prices(seqStore_t* ssPtr) +{ + ssPtr->log2matchLengthSum = ZSTD_highbit32(ssPtr->matchLengthSum+1); + ssPtr->log2litLengthSum = ZSTD_highbit32(ssPtr->litLengthSum+1); + ssPtr->log2litSum = ZSTD_highbit32(ssPtr->litSum+1); + ssPtr->log2offCodeSum = ZSTD_highbit32(ssPtr->offCodeSum+1); + ssPtr->factor = 1 + ((ssPtr->litSum>>5) / ssPtr->litLengthSum) + ((ssPtr->litSum<<1) / (ssPtr->litSum + ssPtr->matchSum)); +} + + +MEM_STATIC void ZSTD_rescaleFreqs(seqStore_t* ssPtr) +{ + unsigned u; + + ssPtr->cachedLiterals = NULL; + ssPtr->cachedPrice = ssPtr->cachedLitLength = 0; + + if (ssPtr->litLengthSum == 0) { + ssPtr->litSum = (2<litLengthSum = MaxLL+1; + ssPtr->matchLengthSum = MaxML+1; + ssPtr->offCodeSum = (MaxOff+1); + ssPtr->matchSum = (2<litFreq[u] = 2; + for (u=0; u<=MaxLL; u++) + ssPtr->litLengthFreq[u] = 1; + for (u=0; u<=MaxML; u++) + ssPtr->matchLengthFreq[u] = 1; + for (u=0; u<=MaxOff; u++) + ssPtr->offCodeFreq[u] = 1; + } else { + ssPtr->matchLengthSum = 0; + ssPtr->litLengthSum = 0; + ssPtr->offCodeSum = 0; + ssPtr->matchSum = 0; + ssPtr->litSum = 0; + + for (u=0; u<=MaxLit; u++) { + ssPtr->litFreq[u] = 1 + (ssPtr->litFreq[u]>>ZSTD_FREQ_DIV); + ssPtr->litSum += ssPtr->litFreq[u]; + } + for (u=0; u<=MaxLL; u++) { + ssPtr->litLengthFreq[u] = 1 + (ssPtr->litLengthFreq[u]>>ZSTD_FREQ_DIV); + ssPtr->litLengthSum += ssPtr->litLengthFreq[u]; + } + for (u=0; u<=MaxML; u++) { + ssPtr->matchLengthFreq[u] = 1 + (ssPtr->matchLengthFreq[u]>>ZSTD_FREQ_DIV); + ssPtr->matchLengthSum += ssPtr->matchLengthFreq[u]; + ssPtr->matchSum += ssPtr->matchLengthFreq[u] * (u + 3); + } + for (u=0; u<=MaxOff; u++) { + ssPtr->offCodeFreq[u] = 1 + (ssPtr->offCodeFreq[u]>>ZSTD_FREQ_DIV); + ssPtr->offCodeSum += ssPtr->offCodeFreq[u]; + } + } + + ZSTD_setLog2Prices(ssPtr); +} + + +FORCE_INLINE U32 ZSTD_getLiteralPrice(seqStore_t* ssPtr, U32 litLength, const BYTE* literals) +{ + U32 price, u; + + if (litLength == 0) + return ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[0]+1); + + /* literals */ + if (ssPtr->cachedLiterals == literals) { + U32 const additional = litLength - ssPtr->cachedLitLength; + const BYTE* literals2 = ssPtr->cachedLiterals + ssPtr->cachedLitLength; + price = ssPtr->cachedPrice + additional * ssPtr->log2litSum; + for (u=0; u < additional; u++) + price -= ZSTD_highbit32(ssPtr->litFreq[literals2[u]]+1); + ssPtr->cachedPrice = price; + ssPtr->cachedLitLength = litLength; + } else { + price = litLength * ssPtr->log2litSum; + for (u=0; u < litLength; u++) + price -= ZSTD_highbit32(ssPtr->litFreq[literals[u]]+1); + + if (litLength >= 12) { + ssPtr->cachedLiterals = literals; + ssPtr->cachedPrice = price; + ssPtr->cachedLitLength = litLength; + } + } + + /* literal Length */ + { static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 16, 17, 17, 18, 18, 19, 19, + 20, 20, 20, 20, 21, 21, 21, 21, + 22, 22, 22, 22, 22, 22, 22, 22, + 23, 23, 23, 23, 23, 23, 23, 23, + 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24 }; + const BYTE LL_deltaCode = 19; + const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength]; + price += LL_bits[llCode] + ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[llCode]+1); + } + + return price; +} + + +FORCE_INLINE U32 ZSTD_getPrice(seqStore_t* seqStorePtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength) +{ + /* offset */ + BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1); + U32 price = offCode + seqStorePtr->log2offCodeSum - ZSTD_highbit32(seqStorePtr->offCodeFreq[offCode]+1); + + /* match Length */ + { static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, + 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 }; + const BYTE ML_deltaCode = 36; + const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength]; + price += ML_bits[mlCode] + seqStorePtr->log2matchLengthSum - ZSTD_highbit32(seqStorePtr->matchLengthFreq[mlCode]+1); + } + + return price + ZSTD_getLiteralPrice(seqStorePtr, litLength, literals) + seqStorePtr->factor; +} + + +MEM_STATIC void ZSTD_updatePrice(seqStore_t* seqStorePtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength) +{ + U32 u; + + /* literals */ + seqStorePtr->litSum += litLength; + for (u=0; u < litLength; u++) + seqStorePtr->litFreq[literals[u]]++; + + /* literal Length */ + { static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 16, 17, 17, 18, 18, 19, 19, + 20, 20, 20, 20, 21, 21, 21, 21, + 22, 22, 22, 22, 22, 22, 22, 22, + 23, 23, 23, 23, 23, 23, 23, 23, + 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24 }; + const BYTE LL_deltaCode = 19; + const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength]; + seqStorePtr->litLengthFreq[llCode]++; + seqStorePtr->litLengthSum++; + } + + /* match offset */ + { BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1); + seqStorePtr->offCodeSum++; + seqStorePtr->offCodeFreq[offCode]++; + } + + /* match Length */ + { static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37, + 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, + 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 }; + const BYTE ML_deltaCode = 36; + const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength]; + seqStorePtr->matchLengthFreq[mlCode]++; + seqStorePtr->matchLengthSum++; + } + + ZSTD_setLog2Prices(seqStorePtr); +} + + +#define SET_PRICE(pos, mlen_, offset_, litlen_, price_) \ + { \ + while (last_pos < pos) { opt[last_pos+1].price = 1<<30; last_pos++; } \ + opt[pos].mlen = mlen_; \ + opt[pos].off = offset_; \ + opt[pos].litlen = litlen_; \ + opt[pos].price = price_; \ + ZSTD_LOG_PARSER("%d: SET price[%d/%d]=%d litlen=%d len=%d off=%d\n", (int)(inr-base), (int)pos, (int)last_pos, opt[pos].price, opt[pos].litlen, opt[pos].mlen, opt[pos].off); \ + } + + + +/* Update hashTable3 up to ip (excluded) + Assumption : always within prefix (ie. not within extDict) */ +FORCE_INLINE +U32 ZSTD_insertAndFindFirstIndexHash3 (ZSTD_CCtx* zc, const BYTE* ip) +{ + U32* const hashTable3 = zc->hashTable3; + U32 const hashLog3 = zc->hashLog3; + const BYTE* const base = zc->base; + U32 idx = zc->nextToUpdate3; + const U32 target = zc->nextToUpdate3 = (U32)(ip - base); + const size_t hash3 = ZSTD_hash3Ptr(ip, hashLog3); + + while(idx < target) { + hashTable3[ZSTD_hash3Ptr(base+idx, hashLog3)] = idx; + idx++; + } + + return hashTable3[hash3]; +} + + +/*-************************************* +* Binary Tree search +***************************************/ +static U32 ZSTD_insertBtAndGetAllMatches ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iLimit, + U32 nbCompares, const U32 mls, + U32 extDict, ZSTD_match_t* matches, const U32 minMatchLen) +{ + const BYTE* const base = zc->base; + const U32 current = (U32)(ip-base); + const U32 hashLog = zc->params.cParams.hashLog; + const size_t h = ZSTD_hashPtr(ip, hashLog, mls); + U32* const hashTable = zc->hashTable; + U32 matchIndex = hashTable[h]; + U32* const bt = zc->chainTable; + const U32 btLog = zc->params.cParams.chainLog - 1; + const U32 btMask= (1U << btLog) - 1; + size_t commonLengthSmaller=0, commonLengthLarger=0; + const BYTE* const dictBase = zc->dictBase; + const U32 dictLimit = zc->dictLimit; + const BYTE* const dictEnd = dictBase + dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const U32 btLow = btMask >= current ? 0 : current - btMask; + const U32 windowLow = zc->lowLimit; + U32* smallerPtr = bt + 2*(current&btMask); + U32* largerPtr = bt + 2*(current&btMask) + 1; + U32 matchEndIdx = current+8; + U32 dummy32; /* to be nullified at the end */ + U32 mnum = 0; + + const U32 minMatch = (mls == 3) ? 3 : 4; + size_t bestLength = minMatchLen-1; + + if (minMatch == 3) { /* HC3 match finder */ + U32 const matchIndex3 = ZSTD_insertAndFindFirstIndexHash3 (zc, ip); + if (matchIndex3>windowLow && (current - matchIndex3 < (1<<18))) { + const BYTE* match; + size_t currentMl=0; + if ((!extDict) || matchIndex3 >= dictLimit) { + match = base + matchIndex3; + if (match[bestLength] == ip[bestLength]) currentMl = ZSTD_count(ip, match, iLimit); + } else { + match = dictBase + matchIndex3; + if (MEM_readMINMATCH(match, MINMATCH) == MEM_readMINMATCH(ip, MINMATCH)) /* assumption : matchIndex3 <= dictLimit-4 (by table construction) */ + currentMl = ZSTD_count_2segments(ip+MINMATCH, match+MINMATCH, iLimit, dictEnd, prefixStart) + MINMATCH; + } + + /* save best solution */ + if (currentMl > bestLength) { + bestLength = currentMl; + matches[mnum].off = ZSTD_REP_MOVE + current - matchIndex3; + matches[mnum].len = (U32)currentMl; + mnum++; + if (currentMl > ZSTD_OPT_NUM) goto update; + if (ip+currentMl == iLimit) goto update; /* best possible, and avoid read overflow*/ + } + } + } + + hashTable[h] = current; /* Update Hash Table */ + + while (nbCompares-- && (matchIndex > windowLow)) { + U32* nextPtr = bt + 2*(matchIndex & btMask); + size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ + const BYTE* match; + + if ((!extDict) || (matchIndex+matchLength >= dictLimit)) { + match = base + matchIndex; + if (match[matchLength] == ip[matchLength]) { +#if ZSTD_OPT_DEBUG >= 5 + size_t ml; + if (matchIndex < dictLimit) + ml = ZSTD_count_2segments(ip, dictBase + matchIndex, iLimit, dictEnd, prefixStart); + else + ml = ZSTD_count(ip, match, ip+matchLength); + if (ml < matchLength) + printf("%d: ERROR_NOEXT: offset=%d matchLength=%d matchIndex=%d dictLimit=%d ml=%d\n", current, (int)(current - matchIndex), (int)matchLength, (int)matchIndex, (int)dictLimit, (int)ml), exit(0); +#endif + matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iLimit) +1; + } + } else { + match = dictBase + matchIndex; +#if ZSTD_OPT_DEBUG >= 5 + if (memcmp(match, ip, matchLength) != 0) + printf("%d: ERROR_EXT: matchLength=%d ZSTD_count=%d\n", current, (int)matchLength, (int)ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dictEnd, prefixStart)), exit(0); +#endif + matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dictEnd, prefixStart); + ZSTD_LOG_PARSER("%d: ZSTD_INSERTBTANDGETALLMATCHES=%d offset=%d dictBase=%p dictEnd=%p prefixStart=%p ip=%p match=%p\n", (int)current, (int)matchLength, (int)(current - matchIndex), dictBase, dictEnd, prefixStart, ip, match); + if (matchIndex+matchLength >= dictLimit) + match = base + matchIndex; /* to prepare for next usage of match[matchLength] */ + } + + if (matchLength > bestLength) { + if (matchLength > matchEndIdx - matchIndex) matchEndIdx = matchIndex + (U32)matchLength; + bestLength = matchLength; + matches[mnum].off = ZSTD_REP_MOVE + current - matchIndex; + matches[mnum].len = (U32)matchLength; + mnum++; + if (matchLength > ZSTD_OPT_NUM) break; + if (ip+matchLength == iLimit) /* equal : no way to know if inf or sup */ + break; /* drop, to guarantee consistency (miss a little bit of compression) */ + } + + if (match[matchLength] < ip[matchLength]) { + /* match is smaller than current */ + *smallerPtr = matchIndex; /* update smaller idx */ + commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ + if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + smallerPtr = nextPtr+1; /* new "smaller" => larger of match */ + matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ + } else { + /* match is larger than current */ + *largerPtr = matchIndex; + commonLengthLarger = matchLength; + if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */ + largerPtr = nextPtr; + matchIndex = nextPtr[0]; + } } + + *smallerPtr = *largerPtr = 0; + +update: + zc->nextToUpdate = (matchEndIdx > current + 8) ? matchEndIdx - 8 : current+1; + return mnum; +} + + +/** Tree updater, providing best match */ +static U32 ZSTD_BtGetAllMatches ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iLimit, + const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, const U32 minMatchLen) +{ + if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls); + return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 0, matches, minMatchLen); +} + + +static U32 ZSTD_BtGetAllMatches_selectMLS ( + ZSTD_CCtx* zc, /* Index table will be updated */ + const BYTE* ip, const BYTE* const iHighLimit, + const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen) +{ + switch(matchLengthSearch) + { + case 3 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen); + default : + case 4 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen); + case 5 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen); + case 6 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen); + } +} + +/** Tree updater, providing best match */ +static U32 ZSTD_BtGetAllMatches_extDict ( + ZSTD_CCtx* zc, + const BYTE* const ip, const BYTE* const iLimit, + const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, const U32 minMatchLen) +{ + if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */ + ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls); + return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 1, matches, minMatchLen); +} + + +static U32 ZSTD_BtGetAllMatches_selectMLS_extDict ( + ZSTD_CCtx* zc, /* Index table will be updated */ + const BYTE* ip, const BYTE* const iHighLimit, + const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen) +{ + switch(matchLengthSearch) + { + case 3 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen); + default : + case 4 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen); + case 5 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen); + case 6 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen); + } +} + + +/*-******************************* +* Optimal parser +*********************************/ +FORCE_INLINE +void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize) +{ + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ctx->base; + const BYTE* const prefixStart = base + ctx->dictLimit; + + const U32 maxSearches = 1U << ctx->params.cParams.searchLog; + const U32 sufficient_len = ctx->params.cParams.targetLength; + const U32 mls = ctx->params.cParams.searchLength; + const U32 minMatch = (ctx->params.cParams.searchLength == 3) ? 3 : 4; + + ZSTD_optimal_t* opt = seqStorePtr->priceTable; + ZSTD_match_t* matches = seqStorePtr->matchTable; + const BYTE* inr; + U32 offset, rep[ZSTD_REP_INIT]; + + /* init */ + ctx->nextToUpdate3 = ctx->nextToUpdate; + ZSTD_rescaleFreqs(seqStorePtr); + ip += (ip==prefixStart); + { U32 i; for (i=0; irep[i]; } + + ZSTD_LOG_BLOCK("%d: COMPBLOCK_OPT_GENERIC srcSz=%d maxSrch=%d mls=%d sufLen=%d\n", (int)(ip-base), (int)srcSize, maxSearches, mls, sufficient_len); + + /* Match Loop */ + while (ip < ilimit) { + U32 cur, match_num, last_pos, litlen, price; + U32 u, mlen, best_mlen, best_off, litLength; + memset(opt, 0, sizeof(ZSTD_optimal_t)); + last_pos = 0; + litlen = (U32)(ip - anchor); + + /* check repCode */ + { U32 i; + for (i=0; i sufficient_len || mlen >= ZSTD_OPT_NUM) { + best_mlen = mlen; best_off = i; cur = 0; last_pos = 1; + goto _storeSequence; + } + best_off = (i<=1 && ip == anchor) ? 1-i : i; + do { + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH); + if (mlen > last_pos || price < opt[mlen].price) + SET_PRICE(mlen, mlen, i, litlen, price); /* note : macro modifies last_pos */ + mlen--; + } while (mlen >= minMatch); + } } } + + match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, ip, iend, maxSearches, mls, matches, minMatch); + + ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos); + if (!last_pos && !match_num) { ip++; continue; } + + if (match_num && (matches[match_num-1].len > sufficient_len || matches[match_num-1].len >= ZSTD_OPT_NUM)) { + best_mlen = matches[match_num-1].len; + best_off = matches[match_num-1].off; + cur = 0; + last_pos = 1; + goto _storeSequence; + } + + /* set prices using matches at position = 0 */ + best_mlen = (last_pos) ? last_pos : minMatch; + for (u = 0; u < match_num; u++) { + mlen = (u>0) ? matches[u-1].len+1 : best_mlen; + best_mlen = matches[u].len; + ZSTD_LOG_PARSER("%d: start Found mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(ip-base), matches[u].len, matches[u].off, (int)best_mlen, (int)last_pos); + while (mlen <= best_mlen) { + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off, mlen - MINMATCH); + if (mlen > last_pos || price < opt[mlen].price) + SET_PRICE(mlen, mlen, matches[u].off, litlen, price); /* note : macro modifies last_pos */ + mlen++; + } } + + if (last_pos < minMatch) { ip++; continue; } + + /* initialize opt[0] */ + { U32 i ; for (i=0; i litlen) { + price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-litlen); + } else + price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor); + } else { + litlen = 1; + price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1); + } + + if (cur > last_pos || price <= opt[cur].price) // || ((price == opt[cur].price) && (opt[cur-1].mlen == 1) && (cur != litlen))) + SET_PRICE(cur, 1, 0, litlen, price); + + if (cur == last_pos) break; + + if (inr > ilimit) /* last match must start at a minimum distance of 8 from oend */ + continue; + + mlen = opt[cur].mlen; + if (opt[cur].off >= ZSTD_REP_NUM) { + opt[cur].rep[2] = opt[cur-mlen].rep[1]; + opt[cur].rep[1] = opt[cur-mlen].rep[0]; + opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE; + ZSTD_LOG_ENCODE("%d: COPYREP_OFF cur=%d mlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]); + } else { + opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2]; + opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1]; + opt[cur].rep[0] = opt[cur-mlen].rep[opt[cur].off]; + ZSTD_LOG_ENCODE("%d: COPYREP_NOR cur=%d mlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]); + } + + ZSTD_LOG_PARSER("%d: CURRENT_NoExt price[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]); + + best_mlen = minMatch; + { U32 i; + for (i=0; i sufficient_len || cur + mlen >= ZSTD_OPT_NUM) { + ZSTD_LOG_PARSER("%d: REP sufficient_len=%d best_mlen=%d best_off=%d last_pos=%d\n", (int)(inr-base), sufficient_len, best_mlen, best_off, last_pos); + best_mlen = mlen; best_off = i; last_pos = cur + 1; + goto _storeSequence; + } + + best_off = (i<=1 && opt[cur].mlen != 1) ? 1-i : i; + if (opt[cur].mlen == 1) { + litlen = opt[cur].litlen; + if (cur > litlen) { + price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, best_off, mlen - MINMATCH); + } else + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH); + } else { + litlen = 0; + price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - MINMATCH); + } + + if (mlen > best_mlen) best_mlen = mlen; + ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_off, price, litlen); + + do { + if (cur + mlen > last_pos || price <= opt[cur + mlen].price) + SET_PRICE(cur + mlen, mlen, i, litlen, price); + mlen--; + } while (mlen >= minMatch); + } } } + + match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, inr, iend, maxSearches, mls, matches, best_mlen); + ZSTD_LOG_PARSER("%d: ZSTD_GetAllMatches match_num=%d\n", (int)(inr-base), match_num); + + if (match_num > 0 && (matches[match_num-1].len > sufficient_len || cur + matches[match_num-1].len >= ZSTD_OPT_NUM)) { + best_mlen = matches[match_num-1].len; + best_off = matches[match_num-1].off; + last_pos = cur + 1; + goto _storeSequence; + } + + /* set prices using matches at position = cur */ + for (u = 0; u < match_num; u++) { + mlen = (u>0) ? matches[u-1].len+1 : best_mlen; + best_mlen = matches[u].len; + + // ZSTD_LOG_PARSER("%d: Found1 cur=%d mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(inr-base), cur, matches[u].len, matches[u].off, best_mlen, last_pos); + while (mlen <= best_mlen) { + if (opt[cur].mlen == 1) { + litlen = opt[cur].litlen; + if (cur > litlen) + price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip+cur-litlen, matches[u].off, mlen - MINMATCH); + else + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off, mlen - MINMATCH); + } else { + litlen = 0; + price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[u].off, mlen - MINMATCH); + } + + // ZSTD_LOG_PARSER("%d: Found2 mlen=%d best_mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_mlen, matches[u].off, price, litlen); + if (cur + mlen > last_pos || (price < opt[cur + mlen].price)) + SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price); + + mlen++; + } } } // for (cur = 1; cur <= last_pos; cur++) + + best_mlen = opt[last_pos].mlen; + best_off = opt[last_pos].off; + cur = last_pos - best_mlen; + + /* store sequence */ +_storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */ + for (u = 1; u <= last_pos; u++) + ZSTD_LOG_PARSER("%d: price[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]); + ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep[0]=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep[0]); + + opt[0].mlen = 1; + + while (1) { + mlen = opt[cur].mlen; + offset = opt[cur].off; + opt[cur].mlen = best_mlen; + opt[cur].off = best_off; + best_mlen = mlen; + best_off = offset; + if (mlen > cur) break; + cur -= mlen; + } + + for (u = 0; u <= last_pos;) { + ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]); + u += opt[u].mlen; + } + + for (cur=0; cur < last_pos; ) { + ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]); + mlen = opt[cur].mlen; + if (mlen == 1) { ip++; cur++; continue; } + offset = opt[cur].off; + cur += mlen; + litLength = (U32)(ip - anchor); + // ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]); + + if (offset >= ZSTD_REP_NUM) { + rep[2] = rep[1]; + rep[1] = rep[0]; + rep[0] = offset - ZSTD_REP_MOVE; + } else { + if (offset != 0) { + best_off = rep[offset]; + if (offset != 1) rep[2] = rep[1]; + rep[1] = rep[0]; + rep[0] = best_off; + } + if (litLength == 0 && offset<=1) offset = 1-offset; + } + + ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]); + +#if ZSTD_OPT_DEBUG >= 5 + U32 ml2; + if (offset >= ZSTD_REP_NUM) + ml2 = (U32)ZSTD_count(ip, ip-(offset-ZSTD_REP_MOVE), iend); + else + ml2 = (U32)ZSTD_count(ip, ip-rep[0], iend); + if ((offset >= 8) && (ml2 < mlen || ml2 < minMatch)) { + printf("%d: ERROR_NoExt iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); } + if (ip < anchor) { + printf("%d: ERROR_NoExt ip < anchor iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); } + if (ip + mlen > iend) { + printf("%d: ERROR_NoExt ip + mlen >= iend iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); } +#endif + + ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH); + ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH); + anchor = ip = ip + mlen; + } } /* for (cur=0; cur < last_pos; ) */ + + /* Save reps for next block */ + { int i; for (i=0; isavedRep[i] = rep[i]; } + + /* Last Literals */ + { size_t const lastLLSize = iend - anchor; + ZSTD_LOG_ENCODE("%d: lastLLSize literals=%u\n", (int)(ip-base), (U32)lastLLSize); + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + + +FORCE_INLINE +void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx, + const void* src, size_t srcSize) +{ + seqStore_t* seqStorePtr = &(ctx->seqStore); + const BYTE* const istart = (const BYTE*)src; + const BYTE* ip = istart; + const BYTE* anchor = istart; + const BYTE* const iend = istart + srcSize; + const BYTE* const ilimit = iend - 8; + const BYTE* const base = ctx->base; + const U32 lowestIndex = ctx->lowLimit; + const U32 dictLimit = ctx->dictLimit; + const BYTE* const prefixStart = base + dictLimit; + const BYTE* const dictBase = ctx->dictBase; + const BYTE* const dictEnd = dictBase + dictLimit; + + const U32 maxSearches = 1U << ctx->params.cParams.searchLog; + const U32 sufficient_len = ctx->params.cParams.targetLength; + const U32 mls = ctx->params.cParams.searchLength; + const U32 minMatch = (ctx->params.cParams.searchLength == 3) ? 3 : 4; + + ZSTD_optimal_t* opt = seqStorePtr->priceTable; + ZSTD_match_t* matches = seqStorePtr->matchTable; + const BYTE* inr; + + /* init */ + U32 offset, rep[ZSTD_REP_INIT]; + { U32 i; for (i=0; irep[i]; } + + ctx->nextToUpdate3 = ctx->nextToUpdate; + ZSTD_rescaleFreqs(seqStorePtr); + ip += (ip==prefixStart); + + ZSTD_LOG_BLOCK("%d: COMPBLOCK_OPT_EXTDICT srcSz=%d maxSrch=%d mls=%d sufLen=%d\n", (int)(ip-base), (int)srcSize, maxSearches, mls, sufficient_len); + + /* Match Loop */ + while (ip < ilimit) { + U32 cur, match_num, last_pos, litlen, price; + U32 u, mlen, best_mlen, best_off, litLength; + U32 current = (U32)(ip-base); + memset(opt, 0, sizeof(ZSTD_optimal_t)); + last_pos = 0; + inr = ip; + opt[0].litlen = (U32)(ip - anchor); + + /* check repCode */ + { U32 i; + for (i=0; i= 3) & (repIndex>lowestIndex)) /* intentional overflow */ + && (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) { + /* repcode detected we should take it */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + mlen = (U32)ZSTD_count_2segments(ip+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch; + + ZSTD_LOG_PARSER("%d: start try REP rep[%d]=%d mlen=%d\n", (int)(ip-base), i, (int)rep[i], (int)mlen); + if (mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) { + best_mlen = mlen; best_off = i; cur = 0; last_pos = 1; + goto _storeSequence; + } + + best_off = (i<=1 && ip == anchor) ? 1-i : i; + litlen = opt[0].litlen; + do { + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH); + if (mlen > last_pos || price < opt[mlen].price) + SET_PRICE(mlen, mlen, i, litlen, price); /* note : macro modifies last_pos */ + mlen--; + } while (mlen >= minMatch); + } } } + + match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, ip, iend, maxSearches, mls, matches, minMatch); /* first search (depth 0) */ + + ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos); + if (!last_pos && !match_num) { ip++; continue; } + + { U32 i; for (i=0; i sufficient_len || matches[match_num-1].len >= ZSTD_OPT_NUM)) { + best_mlen = matches[match_num-1].len; + best_off = matches[match_num-1].off; + cur = 0; + last_pos = 1; + goto _storeSequence; + } + + best_mlen = (last_pos) ? last_pos : minMatch; + + // set prices using matches at position = 0 + for (u = 0; u < match_num; u++) { + mlen = (u>0) ? matches[u-1].len+1 : best_mlen; + best_mlen = matches[u].len; + ZSTD_LOG_PARSER("%d: start Found mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(ip-base), matches[u].len, matches[u].off, (int)best_mlen, (int)last_pos); + litlen = opt[0].litlen; + while (mlen <= best_mlen) { + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off, mlen - MINMATCH); + if (mlen > last_pos || price < opt[mlen].price) + SET_PRICE(mlen, mlen, matches[u].off, litlen, price); + mlen++; + } } + + if (last_pos < minMatch) { + // ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ + ip++; continue; + } + + /* check further positions */ + for (cur = 1; cur <= last_pos; cur++) { + inr = ip + cur; + + if (opt[cur-1].mlen == 1) { + litlen = opt[cur-1].litlen + 1; + if (cur > litlen) { + price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-litlen); + } else + price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor); + } else { + litlen = 1; + price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1); + } + + if (cur > last_pos || price <= opt[cur].price) // || ((price == opt[cur].price) && (opt[cur-1].mlen == 1) && (cur != litlen))) + SET_PRICE(cur, 1, 0, litlen, price); + + if (cur == last_pos) break; + + if (inr > ilimit) /* last match must start at a minimum distance of 8 from oend */ + continue; + + mlen = opt[cur].mlen; + if (opt[cur].off >= ZSTD_REP_NUM) { + opt[cur].rep[2] = opt[cur-mlen].rep[1]; + opt[cur].rep[1] = opt[cur-mlen].rep[0]; + opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE; + ZSTD_LOG_ENCODE("%d: COPYREP_OFF cur=%d mlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]); + } else { + opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2]; + opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1]; + opt[cur].rep[0] = opt[cur-mlen].rep[opt[cur].off]; + ZSTD_LOG_ENCODE("%d: COPYREP_NOR cur=%d mlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]); + } + + ZSTD_LOG_PARSER("%d: CURRENT_Ext price[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]); + best_mlen = 0; + + { U32 i; + for (i=0; i= 3) & (repIndex>lowestIndex)) /* intentional overflow */ + && (MEM_readMINMATCH(inr, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) { + /* repcode detected */ + const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; + mlen = (U32)ZSTD_count_2segments(inr+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch; + ZSTD_LOG_PARSER("%d: Found REP %d/%d mlen=%d off=%d rep=%d opt[%d].off=%d\n", (int)(inr-base), i, ZSTD_REP_NUM, mlen, i, opt[cur].rep[i], cur, opt[cur].off); + + if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) { + ZSTD_LOG_PARSER("%d: REP sufficient_len=%d best_mlen=%d best_off=%d last_pos=%d\n", (int)(inr-base), sufficient_len, best_mlen, best_off, last_pos); + best_mlen = mlen; best_off = i; last_pos = cur + 1; + goto _storeSequence; + } + + best_off = (i<=1 && opt[cur].mlen != 1) ? 1-i : i; + if (opt[cur].mlen == 1) { + litlen = opt[cur].litlen; + if (cur > litlen) { + price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, best_off, mlen - MINMATCH); + } else + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH); + } else { + litlen = 0; + price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - MINMATCH); + } + + best_mlen = mlen; + ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_off, price, litlen); + + do { + if (cur + mlen > last_pos || price <= opt[cur + mlen].price) + SET_PRICE(cur + mlen, mlen, i, litlen, price); + mlen--; + } while (mlen >= minMatch); + } } } + + match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, inr, iend, maxSearches, mls, matches, minMatch); + ZSTD_LOG_PARSER("%d: ZSTD_GetAllMatches match_num=%d\n", (int)(inr-base), match_num); + + if (match_num > 0 && matches[match_num-1].len > sufficient_len) { + best_mlen = matches[match_num-1].len; + best_off = matches[match_num-1].off; + last_pos = cur + 1; + goto _storeSequence; + } + + best_mlen = (best_mlen > minMatch) ? best_mlen : minMatch; + + /* set prices using matches at position = cur */ + for (u = 0; u < match_num; u++) { + mlen = (u>0) ? matches[u-1].len+1 : best_mlen; + best_mlen = (cur + matches[u].len < ZSTD_OPT_NUM) ? matches[u].len : ZSTD_OPT_NUM - cur; + + // ZSTD_LOG_PARSER("%d: Found1 cur=%d mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(inr-base), cur, matches[u].len, matches[u].off, best_mlen, last_pos); + while (mlen <= best_mlen) { + if (opt[cur].mlen == 1) { + litlen = opt[cur].litlen; + if (cur > litlen) + price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip+cur-litlen, matches[u].off, mlen - MINMATCH); + else + price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off, mlen - MINMATCH); + } else { + litlen = 0; + price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[u].off, mlen - MINMATCH); + } + + // ZSTD_LOG_PARSER("%d: Found2 mlen=%d best_mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_mlen, matches[u].off, price, litlen); + if (cur + mlen > last_pos || (price < opt[cur + mlen].price)) + SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price); + + mlen++; + } } } /* for (cur = 1; cur <= last_pos; cur++) */ + + best_mlen = opt[last_pos].mlen; + best_off = opt[last_pos].off; + cur = last_pos - best_mlen; + + /* store sequence */ +_storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */ + for (u = 1; u <= last_pos; u++) + ZSTD_LOG_PARSER("%d: price[%u/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]); + ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep[0]=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep[0]); + + opt[0].mlen = 1; + + while (1) { + mlen = opt[cur].mlen; + offset = opt[cur].off; + opt[cur].mlen = best_mlen; + opt[cur].off = best_off; + best_mlen = mlen; + best_off = offset; + if (mlen > cur) break; + cur -= mlen; + } + + for (u = 0; u <= last_pos; ) { + ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]); + u += opt[u].mlen; + } + + for (cur=0; cur < last_pos; ) { + ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]); + mlen = opt[cur].mlen; + if (mlen == 1) { ip++; cur++; continue; } + offset = opt[cur].off; + cur += mlen; + litLength = (U32)(ip - anchor); + // ZSTD_LOG_ENCODE("%d/%d: ENCODE1 literals=%d mlen=%d off=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]); + + if (offset >= ZSTD_REP_NUM) { + rep[2] = rep[1]; + rep[1] = rep[0]; + rep[0] = offset - ZSTD_REP_MOVE; + } else { + if (offset != 0) { + best_off = rep[offset]; + if (offset != 1) rep[2] = rep[1]; + rep[1] = rep[0]; + rep[0] = best_off; + } + if (litLength == 0 && offset<=1) offset = 1-offset; + } + + ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep[0]=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]); + +#if ZSTD_OPT_DEBUG >= 5 + U32 ml2; + if (offset >= ZSTD_REP_NUM) { + best_off = offset - ZSTD_REP_MOVE; + if (best_off > (size_t)(ip - prefixStart)) { + const BYTE* match = dictEnd - (best_off - (ip - prefixStart)); + ml2 = ZSTD_count_2segments(ip, match, iend, dictEnd, prefixStart); + ZSTD_LOG_PARSER("%d: ZSTD_count_2segments=%d offset=%d dictBase=%p dictEnd=%p prefixStart=%p ip=%p match=%p\n", (int)current, (int)ml2, (int)best_off, dictBase, dictEnd, prefixStart, ip, match); + } + else ml2 = (U32)ZSTD_count(ip, ip-offset, iend); + } + else ml2 = (U32)ZSTD_count(ip, ip-rep[0], iend); + if ((offset >= 8) && (ml2 < mlen || ml2 < minMatch)) { + printf("%d: ERROR_Ext iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); } + if (ip < anchor) { + printf("%d: ERROR_Ext ip < anchor iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); } + if (ip + mlen > iend) { + printf("%d: ERROR_Ext ip + mlen >= iend iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); } +#endif + + ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH); + ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH); + anchor = ip = ip + mlen; + } } /* for (cur=0; cur < last_pos; ) */ + + /* Save reps for next block */ + ctx->savedRep[0] = rep[0]; ctx->savedRep[1] = rep[1]; ctx->savedRep[2] = rep[2]; + + /* Last Literals */ + { size_t lastLLSize = iend - anchor; + ZSTD_LOG_ENCODE("%d: lastLLSize literals=%u\n", (int)(ip-base), (U32)(lastLLSize)); + memcpy(seqStorePtr->lit, anchor, lastLLSize); + seqStorePtr->lit += lastLLSize; + } +} + +#endif /* ZSTD_OPT_H_91842398743 */ diff --git a/uppsrc/plugin/zstd/decompress/huf_decompress.c b/uppsrc/plugin/zstd/decompress/huf_decompress.c new file mode 100644 index 000000000..1580b3750 --- /dev/null +++ b/uppsrc/plugin/zstd/decompress/huf_decompress.c @@ -0,0 +1,894 @@ +/* ****************************************************************** + Huffman decoder, part of New Generation Entropy library + Copyright (C) 2013-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy + - Public forum : https://groups.google.com/forum/#!forum/lz4c +****************************************************************** */ + +/* ************************************************************** +* Compiler specifics +****************************************************************/ +#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +/* inline is defined */ +#elif defined(_MSC_VER) +# define inline __inline +#else +# define inline /* disable inline */ +#endif + + +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/* ************************************************************** +* Includes +****************************************************************/ +#include /* memcpy, memset */ +#include "bitstream.h" +#include "fse.h" /* header compression */ +#define HUF_STATIC_LINKING_ONLY +#include "huf.h" + + +/* ************************************************************** +* Error Management +****************************************************************/ +#define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ + + +/*-***************************/ +/* generic DTableDesc */ +/*-***************************/ + +typedef struct { BYTE maxTableLog; BYTE tableType; BYTE tableLog; BYTE reserved; } DTableDesc; + +static DTableDesc HUF_getDTableDesc(const HUF_DTable* table) +{ + DTableDesc dtd; + memcpy(&dtd, table, sizeof(dtd)); + return dtd; +} + + +/*-***************************/ +/* single-symbol decoding */ +/*-***************************/ + +typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */ + +size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize) +{ + BYTE huffWeight[HUF_SYMBOLVALUE_MAX + 1]; + U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; /* large enough for values from 0 to 16 */ + U32 tableLog = 0; + U32 nbSymbols = 0; + size_t iSize; + void* const dtPtr = DTable + 1; + HUF_DEltX2* const dt = (HUF_DEltX2*)dtPtr; + + HUF_STATIC_ASSERT(sizeof(DTableDesc) == sizeof(HUF_DTable)); + //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats(huffWeight, HUF_SYMBOLVALUE_MAX + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); + if (HUF_isError(iSize)) return iSize; + + /* Table header */ + { DTableDesc dtd = HUF_getDTableDesc(DTable); + if (tableLog > (U32)(dtd.maxTableLog+1)) return ERROR(tableLog_tooLarge); /* DTable too small, huffman tree cannot fit in */ + dtd.tableType = 0; + dtd.tableLog = (BYTE)tableLog; + memcpy(DTable, &dtd, sizeof(dtd)); + } + + /* Prepare ranks */ + { U32 n, nextRankStart = 0; + for (n=1; n> 1; + U32 i; + HUF_DEltX2 D; + D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); + for (i = rankVal[w]; i < rankVal[w] + length; i++) + dt[i] = D; + rankVal[w] += length; + } } + + return iSize; +} + + +static BYTE HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog) +{ + size_t const val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ + BYTE const c = dt[val].byte; + BIT_skipBits(Dstream, dt[val].nbBits); + return c; +} + +#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ + *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ + HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) + +#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) + +static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 4 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4)) { + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_1(p, bitDPtr); + HUF_DECODE_SYMBOLX2_2(p, bitDPtr); + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + } + + /* closer to the end */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd)) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + + /* no more data to retrieve from bitstream, hence no need to reload */ + while (p < pEnd) + HUF_DECODE_SYMBOLX2_0(p, bitDPtr); + + return pEnd-pStart; +} + +static size_t HUF_decompress1X2_usingDTable_internal( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + BYTE* op = (BYTE*)dst; + BYTE* const oend = op + dstSize; + const void* dtPtr = DTable + 1; + const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; + BIT_DStream_t bitD; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + + { size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); + if (HUF_isError(errorCode)) return errorCode; } + + HUF_decodeStreamX2(op, &bitD, oend, dt, dtLog); + + /* check */ + if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); + + return dstSize; +} + +size_t HUF_decompress1X2_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 0) return ERROR(GENERIC); + return HUF_decompress1X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); +} + +size_t HUF_decompress1X2_DCtx (HUF_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX2 (DCtx, cSrc, cSrcSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress1X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); +} + +size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); + return HUF_decompress1X2_DCtx (DTable, dst, dstSize, cSrc, cSrcSize); +} + + +static size_t HUF_decompress4X2_usingDTable_internal( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + /* Check */ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + const void* const dtPtr = DTable + 1; + const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + size_t const length1 = MEM_readLE16(istart); + size_t const length2 = MEM_readLE16(istart+2); + size_t const length3 = MEM_readLE16(istart+4); + size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + const size_t segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + U32 endSignal; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + { size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4); + if (HUF_isError(errorCode)) return errorCode; } + + /* 16-32 symbols per loop (4-8 symbols per stream) */ + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) { + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_1(op1, &bitD1); + HUF_DECODE_SYMBOLX2_1(op2, &bitD2); + HUF_DECODE_SYMBOLX2_1(op3, &bitD3); + HUF_DECODE_SYMBOLX2_1(op4, &bitD4); + HUF_DECODE_SYMBOLX2_2(op1, &bitD1); + HUF_DECODE_SYMBOLX2_2(op2, &bitD2); + HUF_DECODE_SYMBOLX2_2(op3, &bitD3); + HUF_DECODE_SYMBOLX2_2(op4, &bitD4); + HUF_DECODE_SYMBOLX2_0(op1, &bitD1); + HUF_DECODE_SYMBOLX2_0(op2, &bitD2); + HUF_DECODE_SYMBOLX2_0(op3, &bitD3); + HUF_DECODE_SYMBOLX2_0(op4, &bitD4); + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + } + + /* check corruption */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 supposed already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); + + /* check */ + endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endSignal) return ERROR(corruption_detected); + + /* decoded size */ + return dstSize; + } +} + + +size_t HUF_decompress4X2_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 0) return ERROR(GENERIC); + return HUF_decompress4X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); +} + + +size_t HUF_decompress4X2_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX2 (dctx, cSrc, cSrcSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress4X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, dctx); +} + +size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); + return HUF_decompress4X2_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} + + +/* *************************/ +/* double-symbols decoding */ +/* *************************/ +typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */ + +typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; + +static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed, + const U32* rankValOrigin, const int minWeight, + const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, + U32 nbBitsBaseline, U16 baseSeq) +{ + HUF_DEltX4 DElt; + U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; + + /* get pre-calculated rankVal */ + memcpy(rankVal, rankValOrigin, sizeof(rankVal)); + + /* fill skipped values */ + if (minWeight>1) { + U32 i, skipSize = rankVal[minWeight]; + MEM_writeLE16(&(DElt.sequence), baseSeq); + DElt.nbBits = (BYTE)(consumed); + DElt.length = 1; + for (i = 0; i < skipSize; i++) + DTable[i] = DElt; + } + + /* fill DTable */ + { U32 s; for (s=0; s= 1 */ + + rankVal[weight] += length; + }} +} + +typedef U32 rankVal_t[HUF_TABLELOG_ABSOLUTEMAX][HUF_TABLELOG_ABSOLUTEMAX + 1]; + +static void HUF_fillDTableX4(HUF_DEltX4* DTable, const U32 targetLog, + const sortedSymbol_t* sortedList, const U32 sortedListSize, + const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, + const U32 nbBitsBaseline) +{ + U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; + const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ + const U32 minBits = nbBitsBaseline - maxWeight; + U32 s; + + memcpy(rankVal, rankValOrigin, sizeof(rankVal)); + + /* fill DTable */ + for (s=0; s= minBits) { /* enough room for a second symbol */ + U32 sortedRank; + int minWeight = nbBits + scaleLog; + if (minWeight < 1) minWeight = 1; + sortedRank = rankStart[minWeight]; + HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, + rankValOrigin[nbBits], minWeight, + sortedList+sortedRank, sortedListSize-sortedRank, + nbBitsBaseline, symbol); + } else { + HUF_DEltX4 DElt; + MEM_writeLE16(&(DElt.sequence), symbol); + DElt.nbBits = (BYTE)(nbBits); + DElt.length = 1; + { U32 u; + const U32 end = start + length; + for (u = start; u < end; u++) DTable[u] = DElt; + } } + rankVal[weight] += length; + } +} + +size_t HUF_readDTableX4 (HUF_DTable* DTable, const void* src, size_t srcSize) +{ + BYTE weightList[HUF_SYMBOLVALUE_MAX + 1]; + sortedSymbol_t sortedSymbol[HUF_SYMBOLVALUE_MAX + 1]; + U32 rankStats[HUF_TABLELOG_ABSOLUTEMAX + 1] = { 0 }; + U32 rankStart0[HUF_TABLELOG_ABSOLUTEMAX + 2] = { 0 }; + U32* const rankStart = rankStart0+1; + rankVal_t rankVal; + U32 tableLog, maxW, sizeOfSort, nbSymbols; + DTableDesc dtd = HUF_getDTableDesc(DTable); + U32 const maxTableLog = dtd.maxTableLog; + size_t iSize; + void* dtPtr = DTable+1; /* force compiler to avoid strict-aliasing */ + HUF_DEltX4* const dt = (HUF_DEltX4*)dtPtr; + + HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(HUF_DTable)); /* if compilation fails here, assertion is false */ + if (maxTableLog > HUF_TABLELOG_ABSOLUTEMAX) return ERROR(tableLog_tooLarge); + //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */ + + iSize = HUF_readStats(weightList, HUF_SYMBOLVALUE_MAX + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); + if (HUF_isError(iSize)) return iSize; + + /* check result */ + if (tableLog > maxTableLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ + + /* find maxWeight */ + for (maxW = tableLog; rankStats[maxW]==0; maxW--) {} /* necessarily finds a solution before 0 */ + + /* Get start index of each weight */ + { U32 w, nextRankStart = 0; + for (w=1; w> consumed; + } } } } + + HUF_fillDTableX4(dt, maxTableLog, + sortedSymbol, sizeOfSort, + rankStart0, rankVal, maxW, + tableLog+1); + + dtd.tableLog = (BYTE)maxTableLog; + dtd.tableType = 1; + memcpy(DTable, &dtd, sizeof(dtd)); + return iSize; +} + + +static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) +{ + const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + memcpy(op, dt+val, 2); + BIT_skipBits(DStream, dt[val].nbBits); + return dt[val].length; +} + +static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) +{ + const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ + memcpy(op, dt+val, 1); + if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits); + else { + if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) { + BIT_skipBits(DStream, dt[val].nbBits); + if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) + DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ + } } + return 1; +} + + +#define HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ + if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +#define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ + if (MEM_64bits()) \ + ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) + +static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog) +{ + BYTE* const pStart = p; + + /* up to 8 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7)) { + HUF_DECODE_SYMBOLX4_2(p, bitDPtr); + HUF_DECODE_SYMBOLX4_1(p, bitDPtr); + HUF_DECODE_SYMBOLX4_2(p, bitDPtr); + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); + } + + /* closer to end : up to 2 symbols at a time */ + while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2)) + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); + + while (p <= pEnd-2) + HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ + + if (p < pEnd) + p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); + + return p-pStart; +} + + +static size_t HUF_decompress1X4_usingDTable_internal( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + BIT_DStream_t bitD; + + /* Init */ + { size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); + if (HUF_isError(errorCode)) return errorCode; + } + + /* decode */ + { BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + const void* const dtPtr = DTable+1; /* force compiler to not use strict-aliasing */ + const HUF_DEltX4* const dt = (const HUF_DEltX4*)dtPtr; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + HUF_decodeStreamX4(ostart, &bitD, oend, dt, dtd.tableLog); + } + + /* check */ + if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); + + /* decoded size */ + return dstSize; +} + +size_t HUF_decompress1X4_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 1) return ERROR(GENERIC); + return HUF_decompress1X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); +} + +size_t HUF_decompress1X4_DCtx (HUF_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t const hSize = HUF_readDTableX4 (DCtx, cSrc, cSrcSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress1X4_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); +} + +size_t HUF_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_TABLELOG_MAX); + return HUF_decompress1X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} + +static size_t HUF_decompress4X4_usingDTable_internal( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ + + { const BYTE* const istart = (const BYTE*) cSrc; + BYTE* const ostart = (BYTE*) dst; + BYTE* const oend = ostart + dstSize; + const void* const dtPtr = DTable+1; + const HUF_DEltX4* const dt = (const HUF_DEltX4*)dtPtr; + + /* Init */ + BIT_DStream_t bitD1; + BIT_DStream_t bitD2; + BIT_DStream_t bitD3; + BIT_DStream_t bitD4; + size_t const length1 = MEM_readLE16(istart); + size_t const length2 = MEM_readLE16(istart+2); + size_t const length3 = MEM_readLE16(istart+4); + size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); + const BYTE* const istart1 = istart + 6; /* jumpTable */ + const BYTE* const istart2 = istart1 + length1; + const BYTE* const istart3 = istart2 + length2; + const BYTE* const istart4 = istart3 + length3; + size_t const segmentSize = (dstSize+3) / 4; + BYTE* const opStart2 = ostart + segmentSize; + BYTE* const opStart3 = opStart2 + segmentSize; + BYTE* const opStart4 = opStart3 + segmentSize; + BYTE* op1 = ostart; + BYTE* op2 = opStart2; + BYTE* op3 = opStart3; + BYTE* op4 = opStart4; + U32 endSignal; + DTableDesc const dtd = HUF_getDTableDesc(DTable); + U32 const dtLog = dtd.tableLog; + + if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ + { size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3); + if (HUF_isError(errorCode)) return errorCode; } + { size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4); + if (HUF_isError(errorCode)) return errorCode; } + + /* 16-32 symbols per loop (4-8 symbols per stream) */ + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) { + HUF_DECODE_SYMBOLX4_2(op1, &bitD1); + HUF_DECODE_SYMBOLX4_2(op2, &bitD2); + HUF_DECODE_SYMBOLX4_2(op3, &bitD3); + HUF_DECODE_SYMBOLX4_2(op4, &bitD4); + HUF_DECODE_SYMBOLX4_1(op1, &bitD1); + HUF_DECODE_SYMBOLX4_1(op2, &bitD2); + HUF_DECODE_SYMBOLX4_1(op3, &bitD3); + HUF_DECODE_SYMBOLX4_1(op4, &bitD4); + HUF_DECODE_SYMBOLX4_2(op1, &bitD1); + HUF_DECODE_SYMBOLX4_2(op2, &bitD2); + HUF_DECODE_SYMBOLX4_2(op3, &bitD3); + HUF_DECODE_SYMBOLX4_2(op4, &bitD4); + HUF_DECODE_SYMBOLX4_0(op1, &bitD1); + HUF_DECODE_SYMBOLX4_0(op2, &bitD2); + HUF_DECODE_SYMBOLX4_0(op3, &bitD3); + HUF_DECODE_SYMBOLX4_0(op4, &bitD4); + + endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); + } + + /* check corruption */ + if (op1 > opStart2) return ERROR(corruption_detected); + if (op2 > opStart3) return ERROR(corruption_detected); + if (op3 > opStart4) return ERROR(corruption_detected); + /* note : op4 supposed already verified within main loop */ + + /* finish bitStreams one by one */ + HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); + HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); + HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); + HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); + + /* check */ + { U32 const endCheck = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); + if (!endCheck) return ERROR(corruption_detected); } + + /* decoded size */ + return dstSize; + } +} + + +size_t HUF_decompress4X4_usingDTable( + void* dst, size_t dstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc dtd = HUF_getDTableDesc(DTable); + if (dtd.tableType != 1) return ERROR(GENERIC); + return HUF_decompress4X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); +} + + +size_t HUF_decompress4X4_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + const BYTE* ip = (const BYTE*) cSrc; + + size_t hSize = HUF_readDTableX4 (dctx, cSrc, cSrcSize); + if (HUF_isError(hSize)) return hSize; + if (hSize >= cSrcSize) return ERROR(srcSize_wrong); + ip += hSize; cSrcSize -= hSize; + + return HUF_decompress4X4_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx); +} + +size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_TABLELOG_MAX); + return HUF_decompress4X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); +} + + +/* ********************************/ +/* Generic decompression selector */ +/* ********************************/ + +size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); + return dtd.tableType ? HUF_decompress1X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : + HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); +} + +size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, + const void* cSrc, size_t cSrcSize, + const HUF_DTable* DTable) +{ + DTableDesc const dtd = HUF_getDTableDesc(DTable); + return dtd.tableType ? HUF_decompress4X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : + HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); +} + + +typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; +static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = +{ + /* single, double, quad */ + {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ + {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ + {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ + {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ + {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ + {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ + {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ + {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ + {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ + {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ + {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ + {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ + {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ + {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ + {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ + {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ +}; + +/** HUF_selectDecoder() : +* Tells which decoder is likely to decode faster, +* based on a set of pre-determined metrics. +* @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 . +* Assumption : 0 < cSrcSize < dstSize <= 128 KB */ +U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize) +{ + /* decoder timing evaluation */ + U32 const Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */ + U32 const D256 = (U32)(dstSize >> 8); + U32 const DTime0 = algoTime[Q][0].tableTime + (algoTime[Q][0].decode256Time * D256); + U32 DTime1 = algoTime[Q][1].tableTime + (algoTime[Q][1].decode256Time * D256); + DTime1 += DTime1 >> 3; /* advantage to algorithm using less memory, for cache eviction */ + + return DTime1 < DTime0; +} + + +typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); + +size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + static const decompressionAlgo decompress[2] = { HUF_decompress4X2, HUF_decompress4X4 }; + + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); + return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); + } + + //return HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */ + //return HUF_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */ +} + +size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); + return algoNb ? HUF_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : + HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; + } +} + +size_t HUF_decompress4X_hufOnly (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if ((cSrcSize >= dstSize) || (cSrcSize <= 1)) return ERROR(corruption_detected); /* invalid */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); + return algoNb ? HUF_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : + HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; + } +} + +size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) +{ + /* validation checks */ + if (dstSize == 0) return ERROR(dstSize_tooSmall); + if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ + if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ + if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ + + { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); + return algoNb ? HUF_decompress1X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : + HUF_decompress1X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; + } +} diff --git a/uppsrc/plugin/zstd/decompress/zbuff_decompress.c b/uppsrc/plugin/zstd/decompress/zbuff_decompress.c new file mode 100644 index 000000000..e74fb5d1f --- /dev/null +++ b/uppsrc/plugin/zstd/decompress/zbuff_decompress.c @@ -0,0 +1,294 @@ +/* + Buffered version of Zstd compression library + Copyright (C) 2015-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : http://www.zstd.net/ +*/ + + +/* ************************************* +* Dependencies +***************************************/ +#include +#include "error_private.h" +#include "zstd_internal.h" /* MIN, ZSTD_blockHeaderSize, ZSTD_BLOCKSIZE_MAX */ +#define ZBUFF_STATIC_LINKING_ONLY +#include "zbuff.h" + + +/*-*************************************************************************** +* Streaming decompression howto +* +* A ZBUFF_DCtx object is required to track streaming operations. +* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources. +* Use ZBUFF_decompressInit() to start a new decompression operation, +* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary. +* Note that ZBUFF_DCtx objects can be re-init multiple times. +* +* Use ZBUFF_decompressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. +* The content of @dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change @dst. +* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency), +* or 0 when a frame is completely decoded, +* or an error code, which can be tested using ZBUFF_isError(). +* +* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize() +* output : ZBUFF_recommendedDOutSize==128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. +* input : ZBUFF_recommendedDInSize == 128KB + 3; +* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . +* *******************************************************************************/ + +typedef enum { ZBUFFds_init, ZBUFFds_loadHeader, + ZBUFFds_read, ZBUFFds_load, ZBUFFds_flush } ZBUFF_dStage; + +/* *** Resource management *** */ +struct ZBUFF_DCtx_s { + ZSTD_DCtx* zd; + ZSTD_frameParams fParams; + ZBUFF_dStage stage; + char* inBuff; + size_t inBuffSize; + size_t inPos; + char* outBuff; + size_t outBuffSize; + size_t outStart; + size_t outEnd; + size_t blockSize; + BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX]; + size_t lhSize; + ZSTD_customMem customMem; +}; /* typedef'd to ZBUFF_DCtx within "zstd_buffered.h" */ + + +ZBUFF_DCtx* ZBUFF_createDCtx(void) +{ + return ZBUFF_createDCtx_advanced(defaultCustomMem); +} + +ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem) +{ + ZBUFF_DCtx* zbd; + + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) + return NULL; + + zbd = (ZBUFF_DCtx*)customMem.customAlloc(customMem.opaque, sizeof(ZBUFF_DCtx)); + if (zbd==NULL) return NULL; + memset(zbd, 0, sizeof(ZBUFF_DCtx)); + memcpy(&zbd->customMem, &customMem, sizeof(ZSTD_customMem)); + zbd->zd = ZSTD_createDCtx_advanced(customMem); + if (zbd->zd == NULL) { ZBUFF_freeDCtx(zbd); return NULL; } + zbd->stage = ZBUFFds_init; + return zbd; +} + +size_t ZBUFF_freeDCtx(ZBUFF_DCtx* zbd) +{ + if (zbd==NULL) return 0; /* support free on null */ + ZSTD_freeDCtx(zbd->zd); + if (zbd->inBuff) zbd->customMem.customFree(zbd->customMem.opaque, zbd->inBuff); + if (zbd->outBuff) zbd->customMem.customFree(zbd->customMem.opaque, zbd->outBuff); + zbd->customMem.customFree(zbd->customMem.opaque, zbd); + return 0; +} + + +/* *** Initialization *** */ + +size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* zbd, const void* dict, size_t dictSize) +{ + zbd->stage = ZBUFFds_loadHeader; + zbd->lhSize = zbd->inPos = zbd->outStart = zbd->outEnd = 0; + return ZSTD_decompressBegin_usingDict(zbd->zd, dict, dictSize); +} + +size_t ZBUFF_decompressInit(ZBUFF_DCtx* zbd) +{ + return ZBUFF_decompressInitDictionary(zbd, NULL, 0); +} + + +/* internal util function */ +MEM_STATIC size_t ZBUFF_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + size_t const length = MIN(dstCapacity, srcSize); + memcpy(dst, src, length); + return length; +} + + +/* *** Decompression *** */ + +size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbd, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr) +{ + const char* const istart = (const char*)src; + const char* const iend = istart + *srcSizePtr; + const char* ip = istart; + char* const ostart = (char*)dst; + char* const oend = ostart + *dstCapacityPtr; + char* op = ostart; + U32 notDone = 1; + + while (notDone) { + switch(zbd->stage) + { + case ZBUFFds_init : + return ERROR(init_missing); + + case ZBUFFds_loadHeader : + { size_t const hSize = ZSTD_getFrameParams(&(zbd->fParams), zbd->headerBuffer, zbd->lhSize); + if (hSize != 0) { + size_t const toLoad = hSize - zbd->lhSize; /* if hSize!=0, hSize > zbd->lhSize */ + if (ZSTD_isError(hSize)) return hSize; + if (toLoad > (size_t)(iend-ip)) { /* not enough input to load full header */ + memcpy(zbd->headerBuffer + zbd->lhSize, ip, iend-ip); + zbd->lhSize += iend-ip; + *dstCapacityPtr = 0; + return (hSize - zbd->lhSize) + ZSTD_blockHeaderSize; /* remaining header bytes + next block header */ + } + memcpy(zbd->headerBuffer + zbd->lhSize, ip, toLoad); zbd->lhSize = hSize; ip += toLoad; + break; + } } + + /* Consume header */ + { size_t const h1Size = ZSTD_nextSrcSizeToDecompress(zbd->zd); /* == ZSTD_frameHeaderSize_min */ + size_t const h1Result = ZSTD_decompressContinue(zbd->zd, NULL, 0, zbd->headerBuffer, h1Size); + if (ZSTD_isError(h1Result)) return h1Result; + if (h1Size < zbd->lhSize) { /* long header */ + size_t const h2Size = ZSTD_nextSrcSizeToDecompress(zbd->zd); + size_t const h2Result = ZSTD_decompressContinue(zbd->zd, NULL, 0, zbd->headerBuffer+h1Size, h2Size); + if (ZSTD_isError(h2Result)) return h2Result; + } } + + zbd->fParams.windowSize = MAX(zbd->fParams.windowSize, 1U << ZSTD_WINDOWLOG_ABSOLUTEMIN); + + /* Frame header instruct buffer sizes */ + { size_t const blockSize = MIN(zbd->fParams.windowSize, ZSTD_BLOCKSIZE_MAX); + zbd->blockSize = blockSize; + if (zbd->inBuffSize < blockSize) { + zbd->customMem.customFree(zbd->customMem.opaque, zbd->inBuff); + zbd->inBuffSize = blockSize; + zbd->inBuff = (char*)zbd->customMem.customAlloc(zbd->customMem.opaque, blockSize); + if (zbd->inBuff == NULL) return ERROR(memory_allocation); + } + { size_t const neededOutSize = zbd->fParams.windowSize + blockSize; + if (zbd->outBuffSize < neededOutSize) { + zbd->customMem.customFree(zbd->customMem.opaque, zbd->outBuff); + zbd->outBuffSize = neededOutSize; + zbd->outBuff = (char*)zbd->customMem.customAlloc(zbd->customMem.opaque, neededOutSize); + if (zbd->outBuff == NULL) return ERROR(memory_allocation); + } } } + zbd->stage = ZBUFFds_read; + + case ZBUFFds_read: + { size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbd->zd); + if (neededInSize==0) { /* end of frame */ + zbd->stage = ZBUFFds_init; + notDone = 0; + break; + } + if ((size_t)(iend-ip) >= neededInSize) { /* decode directly from src */ + const int isSkipFrame = ZSTD_isSkipFrame(zbd->zd); + size_t const decodedSize = ZSTD_decompressContinue(zbd->zd, + zbd->outBuff + zbd->outStart, (isSkipFrame ? 0 : zbd->outBuffSize - zbd->outStart), + ip, neededInSize); + if (ZSTD_isError(decodedSize)) return decodedSize; + ip += neededInSize; + if (!decodedSize && !isSkipFrame) break; /* this was just a header */ + zbd->outEnd = zbd->outStart + decodedSize; + zbd->stage = ZBUFFds_flush; + break; + } + if (ip==iend) { notDone = 0; break; } /* no more input */ + zbd->stage = ZBUFFds_load; + } + + case ZBUFFds_load: + { size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zbd->zd); + size_t const toLoad = neededInSize - zbd->inPos; /* should always be <= remaining space within inBuff */ + size_t loadedSize; + if (toLoad > zbd->inBuffSize - zbd->inPos) return ERROR(corruption_detected); /* should never happen */ + loadedSize = ZBUFF_limitCopy(zbd->inBuff + zbd->inPos, toLoad, ip, iend-ip); + ip += loadedSize; + zbd->inPos += loadedSize; + if (loadedSize < toLoad) { notDone = 0; break; } /* not enough input, wait for more */ + + /* decode loaded input */ + { const int isSkipFrame = ZSTD_isSkipFrame(zbd->zd); + size_t const decodedSize = ZSTD_decompressContinue(zbd->zd, + zbd->outBuff + zbd->outStart, zbd->outBuffSize - zbd->outStart, + zbd->inBuff, neededInSize); + if (ZSTD_isError(decodedSize)) return decodedSize; + zbd->inPos = 0; /* input is consumed */ + if (!decodedSize && !isSkipFrame) { zbd->stage = ZBUFFds_read; break; } /* this was just a header */ + zbd->outEnd = zbd->outStart + decodedSize; + zbd->stage = ZBUFFds_flush; + // break; /* ZBUFFds_flush follows */ + } } + + case ZBUFFds_flush: + { size_t const toFlushSize = zbd->outEnd - zbd->outStart; + size_t const flushedSize = ZBUFF_limitCopy(op, oend-op, zbd->outBuff + zbd->outStart, toFlushSize); + op += flushedSize; + zbd->outStart += flushedSize; + if (flushedSize == toFlushSize) { + zbd->stage = ZBUFFds_read; + if (zbd->outStart + zbd->blockSize > zbd->outBuffSize) + zbd->outStart = zbd->outEnd = 0; + break; + } + /* cannot flush everything */ + notDone = 0; + break; + } + default: return ERROR(GENERIC); /* impossible */ + } } + + /* result */ + *srcSizePtr = ip-istart; + *dstCapacityPtr = op-ostart; + { size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zbd->zd); +// if (nextSrcSizeHint > ZSTD_blockHeaderSize) nextSrcSizeHint+= ZSTD_blockHeaderSize; /* get following block header too */ + nextSrcSizeHint -= zbd->inPos; /* already loaded*/ + return nextSrcSizeHint; + } +} + + + +/* ************************************* +* Tool functions +***************************************/ +size_t ZBUFF_recommendedDInSize(void) { return ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize /* block header size*/ ; } +size_t ZBUFF_recommendedDOutSize(void) { return ZSTD_BLOCKSIZE_MAX; } diff --git a/uppsrc/plugin/zstd/decompress/zstd_decompress.c b/uppsrc/plugin/zstd/decompress/zstd_decompress.c new file mode 100644 index 000000000..e2387c85e --- /dev/null +++ b/uppsrc/plugin/zstd/decompress/zstd_decompress.c @@ -0,0 +1,1362 @@ +/* + zstd - standard compression library + Copyright (C) 2014-2016, Yann Collet. + + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - zstd homepage : http://www.zstd.net +*/ + +/* *************************************************************** +* Tuning parameters +*****************************************************************/ +/*! + * HEAPMODE : + * Select how default decompression function ZSTD_decompress() will allocate memory, + * in memory stack (0), or in memory heap (1, requires malloc()) + */ +#ifndef ZSTD_HEAPMODE +# define ZSTD_HEAPMODE 1 +#endif + +/*! +* LEGACY_SUPPORT : +* if set to 1, ZSTD_decompress() can decode older formats (v0.1+) +*/ +#ifndef ZSTD_LEGACY_SUPPORT +# define ZSTD_LEGACY_SUPPORT 0 +#endif + + +/*-******************************************************* +* Dependencies +*********************************************************/ +#include /* memcpy, memmove, memset */ +#include /* debug only : printf */ +#include "mem.h" /* low level memory routines */ +#define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */ +#include /* XXH_reset, update, digest */ +#define FSE_STATIC_LINKING_ONLY +#include "fse.h" +#define HUF_STATIC_LINKING_ONLY +#include "huf.h" +#include "zstd_internal.h" + +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1) +# include "zstd_legacy.h" +#endif + + +/*-******************************************************* +* Compiler specifics +*********************************************************/ +#ifdef _MSC_VER /* Visual Studio */ +# define FORCE_INLINE static __forceinline +# include /* For Visual 2005 */ +# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ +# pragma warning(disable : 4324) /* disable: C4324: padded structure */ +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + + +/*-************************************* +* Macros +***************************************/ +#define ZSTD_isError ERR_isError /* for inlining */ +#define FSE_isError ERR_isError +#define HUF_isError ERR_isError + + +/*_******************************************************* +* Memory operations +**********************************************************/ +static void ZSTD_copy4(void* dst, const void* src) { memcpy(dst, src, 4); } + + +/*-************************************************************* +* Context management +***************************************************************/ +typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader, + ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock, + ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTD_dStage; + +struct ZSTD_DCtx_s +{ + FSE_DTable LLTable[FSE_DTABLE_SIZE_U32(LLFSELog)]; + FSE_DTable OffTable[FSE_DTABLE_SIZE_U32(OffFSELog)]; + FSE_DTable MLTable[FSE_DTABLE_SIZE_U32(MLFSELog)]; + HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */ + const void* previousDstEnd; + const void* base; + const void* vBase; + const void* dictEnd; + size_t expected; + U32 rep[3]; + ZSTD_frameParams fParams; + blockType_t bType; /* used in ZSTD_decompressContinue(), to transfer blockType between header decoding and block decoding stages */ + ZSTD_dStage stage; + U32 litEntropy; + U32 fseEntropy; + XXH64_state_t xxhState; + size_t headerSize; + U32 dictID; + const BYTE* litPtr; + ZSTD_customMem customMem; + size_t litBufSize; + size_t litSize; + BYTE litBuffer[ZSTD_BLOCKSIZE_MAX + WILDCOPY_OVERLENGTH]; + BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX]; +}; /* typedef'd to ZSTD_DCtx within "zstd_static.h" */ + +size_t ZSTD_sizeofDCtx (const ZSTD_DCtx* dctx) { return sizeof(*dctx); } + +size_t ZSTD_estimateDCtxSize(void) { return sizeof(ZSTD_DCtx); } + +size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx) +{ + dctx->expected = ZSTD_frameHeaderSize_min; + dctx->stage = ZSTDds_getFrameHeaderSize; + dctx->previousDstEnd = NULL; + dctx->base = NULL; + dctx->vBase = NULL; + dctx->dictEnd = NULL; + dctx->hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); + dctx->litEntropy = dctx->fseEntropy = 0; + dctx->dictID = 0; + { int i; for (i=0; irep[i] = repStartValue[i]; } + return 0; +} + +ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem) +{ + ZSTD_DCtx* dctx; + + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) + return NULL; + + dctx = (ZSTD_DCtx*) customMem.customAlloc(customMem.opaque, sizeof(ZSTD_DCtx)); + if (!dctx) return NULL; + memcpy(&dctx->customMem, &customMem, sizeof(ZSTD_customMem)); + ZSTD_decompressBegin(dctx); + return dctx; +} + +ZSTD_DCtx* ZSTD_createDCtx(void) +{ + return ZSTD_createDCtx_advanced(defaultCustomMem); +} + +size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx) +{ + if (dctx==NULL) return 0; /* support free on NULL */ + dctx->customMem.customFree(dctx->customMem.opaque, dctx); + return 0; /* reserved as a potential error code in the future */ +} + +void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx) +{ + memcpy(dstDCtx, srcDCtx, + sizeof(ZSTD_DCtx) - (ZSTD_BLOCKSIZE_MAX+WILDCOPY_OVERLENGTH + ZSTD_frameHeaderSize_max)); /* no need to copy workspace */ +} + + +/*-************************************************************* +* Decompression section +***************************************************************/ + +/* Frame format description + Frame Header - [ Block Header - Block ] - Frame End + 1) Frame Header + - 4 bytes - Magic Number : ZSTD_MAGICNUMBER (defined within zstd.h) + - 1 byte - Frame Descriptor + 2) Block Header + - 3 bytes, starting with a 2-bits descriptor + Uncompressed, Compressed, Frame End, unused + 3) Block + See Block Format Description + 4) Frame End + - 3 bytes, compatible with Block Header +*/ + + +/* Frame Header : + + 1 byte - FrameHeaderDescription : + bit 0-1 : dictID (0, 1, 2 or 4 bytes) + bit 2 : checksumFlag + bit 3 : reserved (must be zero) + bit 4 : reserved (unused, can be any value) + bit 5 : Single Segment (if 1, WindowLog byte is not present) + bit 6-7 : FrameContentFieldSize (0, 2, 4, or 8) + if (SkippedWindowLog && !FrameContentFieldsize) FrameContentFieldsize=1; + + Optional : WindowLog (0 or 1 byte) + bit 0-2 : octal Fractional (1/8th) + bit 3-7 : Power of 2, with 0 = 1 KB (up to 2 TB) + + Optional : dictID (0, 1, 2 or 4 bytes) + Automatic adaptation + 0 : no dictID + 1 : 1 - 255 + 2 : 256 - 65535 + 4 : all other values + + Optional : content size (0, 1, 2, 4 or 8 bytes) + 0 : unknown (fcfs==0 and swl==0) + 1 : 0-255 bytes (fcfs==0 and swl==1) + 2 : 256 - 65535+256 (fcfs==1) + 4 : 0 - 4GB-1 (fcfs==2) + 8 : 0 - 16EB-1 (fcfs==3) +*/ + + +/* Compressed Block, format description + + Block = Literal Section - Sequences Section + Prerequisite : size of (compressed) block, maximum size of regenerated data + + 1) Literal Section + + 1.1) Header : 1-5 bytes + flags: 2 bits + 00 compressed by Huff0 + 01 unused + 10 is Raw (uncompressed) + 11 is Rle + Note : using 01 => Huff0 with precomputed table ? + Note : delta map ? => compressed ? + + 1.1.1) Huff0-compressed literal block : 3-5 bytes + srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream + srcSize < 1 KB => 3 bytes (2-2-10-10) + srcSize < 16KB => 4 bytes (2-2-14-14) + else => 5 bytes (2-2-18-18) + big endian convention + + 1.1.2) Raw (uncompressed) literal block header : 1-3 bytes + size : 5 bits: (IS_RAW<<6) + (0<<4) + size + 12 bits: (IS_RAW<<6) + (2<<4) + (size>>8) + size&255 + 20 bits: (IS_RAW<<6) + (3<<4) + (size>>16) + size>>8&255 + size&255 + + 1.1.3) Rle (repeated single byte) literal block header : 1-3 bytes + size : 5 bits: (IS_RLE<<6) + (0<<4) + size + 12 bits: (IS_RLE<<6) + (2<<4) + (size>>8) + size&255 + 20 bits: (IS_RLE<<6) + (3<<4) + (size>>16) + size>>8&255 + size&255 + + 1.1.4) Huff0-compressed literal block, using precomputed CTables : 3-5 bytes + srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream + srcSize < 1 KB => 3 bytes (2-2-10-10) + srcSize < 16KB => 4 bytes (2-2-14-14) + else => 5 bytes (2-2-18-18) + big endian convention + + 1- CTable available (stored into workspace ?) + 2- Small input (fast heuristic ? Full comparison ? depend on clevel ?) + + + 1.2) Literal block content + + 1.2.1) Huff0 block, using sizes from header + See Huff0 format + + 1.2.2) Huff0 block, using prepared table + + 1.2.3) Raw content + + 1.2.4) single byte + + + 2) Sequences section + TO DO +*/ + +/** ZSTD_frameHeaderSize() : +* srcSize must be >= ZSTD_frameHeaderSize_min. +* @return : size of the Frame Header */ +static size_t ZSTD_frameHeaderSize(const void* src, size_t srcSize) +{ + if (srcSize < ZSTD_frameHeaderSize_min) return ERROR(srcSize_wrong); + { BYTE const fhd = ((const BYTE*)src)[4]; + U32 const dictID= fhd & 3; + U32 const directMode = (fhd >> 5) & 1; + U32 const fcsId = fhd >> 6; + return ZSTD_frameHeaderSize_min + !directMode + ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId] + + (directMode && !ZSTD_fcs_fieldSize[fcsId]); + } +} + + +/** ZSTD_getFrameParams() : +* decode Frame Header, or require larger `srcSize`. +* @return : 0, `fparamsPtr` is correctly filled, +* >0, `srcSize` is too small, result is expected `srcSize`, +* or an error code, which can be tested using ZSTD_isError() */ +size_t ZSTD_getFrameParams(ZSTD_frameParams* fparamsPtr, const void* src, size_t srcSize) +{ + const BYTE* ip = (const BYTE*)src; + + if (srcSize < ZSTD_frameHeaderSize_min) return ZSTD_frameHeaderSize_min; + if (MEM_readLE32(src) != ZSTD_MAGICNUMBER) { + if ((MEM_readLE32(src) & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START) { + if (srcSize < ZSTD_skippableHeaderSize) return ZSTD_skippableHeaderSize; /* magic number + skippable frame length */ + memset(fparamsPtr, 0, sizeof(*fparamsPtr)); + fparamsPtr->frameContentSize = MEM_readLE32((const char *)src + 4); + fparamsPtr->windowSize = 0; /* windowSize==0 means a frame is skippable */ + return 0; + } + return ERROR(prefix_unknown); + } + + /* ensure there is enough `srcSize` to fully read/decode frame header */ + { size_t const fhsize = ZSTD_frameHeaderSize(src, srcSize); + if (srcSize < fhsize) return fhsize; } + + { BYTE const fhdByte = ip[4]; + size_t pos = 5; + U32 const dictIDSizeCode = fhdByte&3; + U32 const checksumFlag = (fhdByte>>2)&1; + U32 const directMode = (fhdByte>>5)&1; + U32 const fcsID = fhdByte>>6; + U32 const windowSizeMax = 1U << ZSTD_WINDOWLOG_MAX; + U32 windowSize = 0; + U32 dictID = 0; + U64 frameContentSize = 0; + if ((fhdByte & 0x08) != 0) return ERROR(frameParameter_unsupported); /* reserved bits, which must be zero */ + if (!directMode) { + BYTE const wlByte = ip[pos++]; + U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN; + if (windowLog > ZSTD_WINDOWLOG_MAX) return ERROR(frameParameter_unsupported); + windowSize = (1U << windowLog); + windowSize += (windowSize >> 3) * (wlByte&7); + } + + switch(dictIDSizeCode) + { + default: /* impossible */ + case 0 : break; + case 1 : dictID = ip[pos]; pos++; break; + case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break; + case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break; + } + switch(fcsID) + { + default: /* impossible */ + case 0 : if (directMode) frameContentSize = ip[pos]; break; + case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break; + case 2 : frameContentSize = MEM_readLE32(ip+pos); break; + case 3 : frameContentSize = MEM_readLE64(ip+pos); break; + } + if (!windowSize) windowSize = (U32)frameContentSize; + if (windowSize > windowSizeMax) return ERROR(frameParameter_unsupported); + fparamsPtr->frameContentSize = frameContentSize; + fparamsPtr->windowSize = windowSize; + fparamsPtr->dictID = dictID; + fparamsPtr->checksumFlag = checksumFlag; + } + return 0; +} + + +/** ZSTD_getDecompressedSize() : +* compatible with legacy mode +* @return : decompressed size if known, 0 otherwise + note : 0 can mean any of the following : + - decompressed size is not provided within frame header + - frame header unknown / not supported + - frame header not completely provided (`srcSize` too small) */ +unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize) +{ +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1) + if (ZSTD_isLegacy(src, srcSize)) return ZSTD_getDecompressedSize_legacy(src, srcSize); +#endif + { ZSTD_frameParams fparams; + size_t const frResult = ZSTD_getFrameParams(&fparams, src, srcSize); + if (frResult!=0) return 0; + return fparams.frameContentSize; + } +} + + +/** ZSTD_decodeFrameHeader() : +* `srcSize` must be the size provided by ZSTD_frameHeaderSize(). +* @return : 0 if success, or an error code, which can be tested using ZSTD_isError() */ +static size_t ZSTD_decodeFrameHeader(ZSTD_DCtx* dctx, const void* src, size_t srcSize) +{ + size_t const result = ZSTD_getFrameParams(&(dctx->fParams), src, srcSize); + if (dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID)) return ERROR(dictionary_wrong); + if (dctx->fParams.checksumFlag) XXH64_reset(&dctx->xxhState, 0); + return result; +} + + +typedef struct +{ + blockType_t blockType; + U32 origSize; +} blockProperties_t; + +/*! ZSTD_getcBlockSize() : +* Provides the size of compressed block from block header `src` */ +size_t ZSTD_getcBlockSize(const void* src, size_t srcSize, blockProperties_t* bpPtr) +{ + const BYTE* const in = (const BYTE* const)src; + U32 cSize; + + if (srcSize < ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); + + bpPtr->blockType = (blockType_t)((*in) >> 6); + cSize = in[2] + (in[1]<<8) + ((in[0] & 7)<<16); + bpPtr->origSize = (bpPtr->blockType == bt_rle) ? cSize : 0; + + if (bpPtr->blockType == bt_end) return 0; + if (bpPtr->blockType == bt_rle) return 1; + return cSize; +} + + +static size_t ZSTD_copyRawBlock(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + if (srcSize > dstCapacity) return ERROR(dstSize_tooSmall); + memcpy(dst, src, srcSize); + return srcSize; +} + + +/*! ZSTD_decodeLiteralsBlock() : + @return : nb of bytes read from src (< srcSize ) */ +size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx, + const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */ +{ + const BYTE* const istart = (const BYTE*) src; + + if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected); + + switch((litBlockType_t)(istart[0]>> 6)) + { + case lbt_huffman: + { size_t litSize, litCSize, singleStream=0; + U32 lhSize = (istart[0] >> 4) & 3; + if (srcSize < 5) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for lhSize, + cSize (+nbSeq) */ + switch(lhSize) + { + case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ + /* 2 - 2 - 10 - 10 */ + lhSize=3; + singleStream = istart[0] & 16; + litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); + litCSize = ((istart[1] & 3) << 8) + istart[2]; + break; + case 2: + /* 2 - 2 - 14 - 14 */ + lhSize=4; + litSize = ((istart[0] & 15) << 10) + (istart[1] << 2) + (istart[2] >> 6); + litCSize = ((istart[2] & 63) << 8) + istart[3]; + break; + case 3: + /* 2 - 2 - 18 - 18 */ + lhSize=5; + litSize = ((istart[0] & 15) << 14) + (istart[1] << 6) + (istart[2] >> 2); + litCSize = ((istart[2] & 3) << 16) + (istart[3] << 8) + istart[4]; + break; + } + if (litSize > ZSTD_BLOCKSIZE_MAX) return ERROR(corruption_detected); + if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); + + if (HUF_isError(singleStream ? + HUF_decompress1X2_DCtx(dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) : + HUF_decompress4X_hufOnly (dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) )) + return ERROR(corruption_detected); + + dctx->litPtr = dctx->litBuffer; + dctx->litBufSize = ZSTD_BLOCKSIZE_MAX+8; + dctx->litSize = litSize; + dctx->litEntropy = 1; + return litCSize + lhSize; + } + case lbt_repeat: + { size_t litSize, litCSize; + U32 lhSize = ((istart[0]) >> 4) & 3; + if (lhSize != 1) /* only case supported for now : small litSize, single stream */ + return ERROR(corruption_detected); + if (dctx->litEntropy==0) + return ERROR(dictionary_corrupted); + + /* 2 - 2 - 10 - 10 */ + lhSize=3; + litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); + litCSize = ((istart[1] & 3) << 8) + istart[2]; + if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); + + { size_t const errorCode = HUF_decompress1X4_usingDTable(dctx->litBuffer, litSize, istart+lhSize, litCSize, dctx->hufTable); + if (HUF_isError(errorCode)) return ERROR(corruption_detected); + } + dctx->litPtr = dctx->litBuffer; + dctx->litBufSize = ZSTD_BLOCKSIZE_MAX+WILDCOPY_OVERLENGTH; + dctx->litSize = litSize; + return litCSize + lhSize; + } + case lbt_raw: + { size_t litSize; + U32 lhSize = ((istart[0]) >> 4) & 3; + switch(lhSize) + { + case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ + lhSize=1; + litSize = istart[0] & 31; + break; + case 2: + litSize = ((istart[0] & 15) << 8) + istart[1]; + break; + case 3: + litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; + break; + } + + if (lhSize+litSize+WILDCOPY_OVERLENGTH > srcSize) { /* risk reading beyond src buffer with wildcopy */ + if (litSize+lhSize > srcSize) return ERROR(corruption_detected); + memcpy(dctx->litBuffer, istart+lhSize, litSize); + dctx->litPtr = dctx->litBuffer; + dctx->litBufSize = ZSTD_BLOCKSIZE_MAX+8; + dctx->litSize = litSize; + return lhSize+litSize; + } + /* direct reference into compressed stream */ + dctx->litPtr = istart+lhSize; + dctx->litBufSize = srcSize-lhSize; + dctx->litSize = litSize; + return lhSize+litSize; + } + case lbt_rle: + { size_t litSize; + U32 lhSize = ((istart[0]) >> 4) & 3; + switch(lhSize) + { + case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ + lhSize = 1; + litSize = istart[0] & 31; + break; + case 2: + litSize = ((istart[0] & 15) << 8) + istart[1]; + break; + case 3: + litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; + if (srcSize<4) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4 */ + break; + } + if (litSize > ZSTD_BLOCKSIZE_MAX) return ERROR(corruption_detected); + memset(dctx->litBuffer, istart[lhSize], litSize); + dctx->litPtr = dctx->litBuffer; + dctx->litBufSize = ZSTD_BLOCKSIZE_MAX+WILDCOPY_OVERLENGTH; + dctx->litSize = litSize; + return lhSize+1; + } + default: + return ERROR(corruption_detected); /* impossible */ + } +} + + +/*! ZSTD_buildSeqTable() : + @return : nb bytes read from src, + or an error code if it fails, testable with ZSTD_isError() +*/ +FORCE_INLINE size_t ZSTD_buildSeqTable(FSE_DTable* DTable, U32 type, U32 max, U32 maxLog, + const void* src, size_t srcSize, + const S16* defaultNorm, U32 defaultLog, U32 flagRepeatTable) +{ + switch(type) + { + case FSE_ENCODING_RLE : + if (!srcSize) return ERROR(srcSize_wrong); + if ( (*(const BYTE*)src) > max) return ERROR(corruption_detected); + FSE_buildDTable_rle(DTable, *(const BYTE*)src); /* if *src > max, data is corrupted */ + return 1; + case FSE_ENCODING_RAW : + FSE_buildDTable(DTable, defaultNorm, max, defaultLog); + return 0; + case FSE_ENCODING_STATIC: + if (!flagRepeatTable) return ERROR(corruption_detected); + return 0; + default : /* impossible */ + case FSE_ENCODING_DYNAMIC : + { U32 tableLog; + S16 norm[MaxSeq+1]; + size_t const headerSize = FSE_readNCount(norm, &max, &tableLog, src, srcSize); + if (FSE_isError(headerSize)) return ERROR(corruption_detected); + if (tableLog > maxLog) return ERROR(corruption_detected); + FSE_buildDTable(DTable, norm, max, tableLog); + return headerSize; + } } +} + + +size_t ZSTD_decodeSeqHeaders(int* nbSeqPtr, + FSE_DTable* DTableLL, FSE_DTable* DTableML, FSE_DTable* DTableOffb, U32 flagRepeatTable, + const void* src, size_t srcSize) +{ + const BYTE* const istart = (const BYTE* const)src; + const BYTE* const iend = istart + srcSize; + const BYTE* ip = istart; + + /* check */ + if (srcSize < MIN_SEQUENCES_SIZE) return ERROR(srcSize_wrong); + + /* SeqHead */ + { int nbSeq = *ip++; + if (!nbSeq) { *nbSeqPtr=0; return 1; } + if (nbSeq > 0x7F) { + if (nbSeq == 0xFF) + nbSeq = MEM_readLE16(ip) + LONGNBSEQ, ip+=2; + else + nbSeq = ((nbSeq-0x80)<<8) + *ip++; + } + *nbSeqPtr = nbSeq; + } + + /* FSE table descriptors */ + { U32 const LLtype = *ip >> 6; + U32 const OFtype = (*ip >> 4) & 3; + U32 const MLtype = (*ip >> 2) & 3; + ip++; + + /* check */ + if (ip > iend-3) return ERROR(srcSize_wrong); /* min : all 3 are "raw", hence no header, but at least xxLog bits per type */ + + /* Build DTables */ + { size_t const llhSize = ZSTD_buildSeqTable(DTableLL, LLtype, MaxLL, LLFSELog, ip, iend-ip, LL_defaultNorm, LL_defaultNormLog, flagRepeatTable); + if (ZSTD_isError(llhSize)) return ERROR(corruption_detected); + ip += llhSize; + } + { size_t const ofhSize = ZSTD_buildSeqTable(DTableOffb, OFtype, MaxOff, OffFSELog, ip, iend-ip, OF_defaultNorm, OF_defaultNormLog, flagRepeatTable); + if (ZSTD_isError(ofhSize)) return ERROR(corruption_detected); + ip += ofhSize; + } + { size_t const mlhSize = ZSTD_buildSeqTable(DTableML, MLtype, MaxML, MLFSELog, ip, iend-ip, ML_defaultNorm, ML_defaultNormLog, flagRepeatTable); + if (ZSTD_isError(mlhSize)) return ERROR(corruption_detected); + ip += mlhSize; + } } + + return ip-istart; +} + + +typedef struct { + size_t litLength; + size_t matchLength; + size_t offset; +} seq_t; + +typedef struct { + BIT_DStream_t DStream; + FSE_DState_t stateLL; + FSE_DState_t stateOffb; + FSE_DState_t stateML; + size_t prevOffset[ZSTD_REP_INIT]; +} seqState_t; + + +static seq_t ZSTD_decodeSequence(seqState_t* seqState) +{ + seq_t seq; + + U32 const llCode = FSE_peekSymbol(&(seqState->stateLL)); + U32 const mlCode = FSE_peekSymbol(&(seqState->stateML)); + U32 const ofCode = FSE_peekSymbol(&(seqState->stateOffb)); /* <= maxOff, by table construction */ + + U32 const llBits = LL_bits[llCode]; + U32 const mlBits = ML_bits[mlCode]; + U32 const ofBits = ofCode; + U32 const totalBits = llBits+mlBits+ofBits; + + static const U32 LL_base[MaxLL+1] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 18, 20, 22, 24, 28, 32, 40, 48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, + 0x2000, 0x4000, 0x8000, 0x10000 }; + + static const U32 ML_base[MaxML+1] = { + 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, + 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, + 35, 37, 39, 41, 43, 47, 51, 59, 67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803, + 0x1003, 0x2003, 0x4003, 0x8003, 0x10003 }; + + static const U32 OF_base[MaxOff+1] = { + 0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D, + 0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD, + 0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD, + 0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD }; + + /* sequence */ + { size_t offset; + if (!ofCode) + offset = 0; + else { + offset = OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */ + if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream)); + } + + if (ofCode <= 1) { + if ((llCode == 0) & (offset <= 1)) offset = 1-offset; + if (offset) { + size_t const temp = seqState->prevOffset[offset]; + if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1]; + seqState->prevOffset[1] = seqState->prevOffset[0]; + seqState->prevOffset[0] = offset = temp; + } else { + offset = seqState->prevOffset[0]; + } + } else { + seqState->prevOffset[2] = seqState->prevOffset[1]; + seqState->prevOffset[1] = seqState->prevOffset[0]; + seqState->prevOffset[0] = offset; + } + seq.offset = offset; + } + + seq.matchLength = ML_base[mlCode] + ((mlCode>31) ? BIT_readBits(&(seqState->DStream), mlBits) : 0); /* <= 16 bits */ + if (MEM_32bits() && (mlBits+llBits>24)) BIT_reloadDStream(&(seqState->DStream)); + + seq.litLength = LL_base[llCode] + ((llCode>15) ? BIT_readBits(&(seqState->DStream), llBits) : 0); /* <= 16 bits */ + if (MEM_32bits() || + (totalBits > 64 - 7 - (LLFSELog+MLFSELog+OffFSELog)) ) BIT_reloadDStream(&(seqState->DStream)); + + /* ANS state update */ + FSE_updateState(&(seqState->stateLL), &(seqState->DStream)); /* <= 9 bits */ + FSE_updateState(&(seqState->stateML), &(seqState->DStream)); /* <= 9 bits */ + if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream)); /* <= 18 bits */ + FSE_updateState(&(seqState->stateOffb), &(seqState->DStream)); /* <= 8 bits */ + + return seq; +} + + +FORCE_INLINE +size_t ZSTD_execSequence(BYTE* op, + BYTE* const oend, seq_t sequence, + const BYTE** litPtr, const BYTE* const litLimit_w, + const BYTE* const base, const BYTE* const vBase, const BYTE* const dictEnd) +{ + BYTE* const oLitEnd = op + sequence.litLength; + size_t const sequenceLength = sequence.litLength + sequence.matchLength; + BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */ + BYTE* const oend_w = oend-WILDCOPY_OVERLENGTH; + const BYTE* const iLitEnd = *litPtr + sequence.litLength; + const BYTE* match = oLitEnd - sequence.offset; + + /* check */ + if ((oLitEnd>oend_w) | (oMatchEnd>oend)) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend */ + if (iLitEnd > litLimit_w) return ERROR(corruption_detected); /* over-read beyond lit buffer */ + + /* copy Literals */ + ZSTD_wildcopy(op, *litPtr, sequence.litLength); /* note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */ + op = oLitEnd; + *litPtr = iLitEnd; /* update for next sequence */ + + /* copy Match */ + if (sequence.offset > (size_t)(oLitEnd - base)) { + /* offset beyond prefix */ + if (sequence.offset > (size_t)(oLitEnd - vBase)) return ERROR(corruption_detected); + match = dictEnd - (base-match); + if (match + sequence.matchLength <= dictEnd) { + memmove(oLitEnd, match, sequence.matchLength); + return sequenceLength; + } + /* span extDict & currentPrefixSegment */ + { size_t const length1 = dictEnd - match; + memmove(oLitEnd, match, length1); + op = oLitEnd + length1; + sequence.matchLength -= length1; + match = base; + } } + + /* match within prefix */ + if (sequence.offset < 8) { + /* close range match, overlap */ + static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */ + static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* substracted */ + int const sub2 = dec64table[sequence.offset]; + op[0] = match[0]; + op[1] = match[1]; + op[2] = match[2]; + op[3] = match[3]; + match += dec32table[sequence.offset]; + ZSTD_copy4(op+4, match); + match -= sub2; + } else { + ZSTD_copy8(op, match); + } + op += 8; match += 8; + + if (oMatchEnd > oend-(16-MINMATCH)) { + if (op < oend_w) { + ZSTD_wildcopy(op, match, oend_w - op); + match += oend_w - op; + op = oend_w; + } + while (op < oMatchEnd) *op++ = *match++; + } else { + ZSTD_wildcopy(op, match, sequence.matchLength-8); /* works even if matchLength < 8 */ + } + return sequenceLength; +} + + +static size_t ZSTD_decompressSequences( + ZSTD_DCtx* dctx, + void* dst, size_t maxDstSize, + const void* seqStart, size_t seqSize) +{ + const BYTE* ip = (const BYTE*)seqStart; + const BYTE* const iend = ip + seqSize; + BYTE* const ostart = (BYTE* const)dst; + BYTE* const oend = ostart + maxDstSize; + BYTE* op = ostart; + const BYTE* litPtr = dctx->litPtr; + const BYTE* const litLimit_w = litPtr + dctx->litBufSize - WILDCOPY_OVERLENGTH; + const BYTE* const litEnd = litPtr + dctx->litSize; + FSE_DTable* DTableLL = dctx->LLTable; + FSE_DTable* DTableML = dctx->MLTable; + FSE_DTable* DTableOffb = dctx->OffTable; + const BYTE* const base = (const BYTE*) (dctx->base); + const BYTE* const vBase = (const BYTE*) (dctx->vBase); + const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd); + int nbSeq; + + /* Build Decoding Tables */ + { size_t const seqHSize = ZSTD_decodeSeqHeaders(&nbSeq, DTableLL, DTableML, DTableOffb, dctx->fseEntropy, ip, seqSize); + if (ZSTD_isError(seqHSize)) return seqHSize; + ip += seqHSize; + } + + /* Regen sequences */ + if (nbSeq) { + seqState_t seqState; + dctx->fseEntropy = 1; + { U32 i; for (i=0; irep[i]; } + { size_t const errorCode = BIT_initDStream(&(seqState.DStream), ip, iend-ip); + if (ERR_isError(errorCode)) return ERROR(corruption_detected); } + FSE_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL); + FSE_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb); + FSE_initDState(&(seqState.stateML), &(seqState.DStream), DTableML); + + for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && nbSeq ; ) { + nbSeq--; + { seq_t const sequence = ZSTD_decodeSequence(&seqState); + size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litLimit_w, base, vBase, dictEnd); + if (ZSTD_isError(oneSeqSize)) return oneSeqSize; + op += oneSeqSize; + } } + + /* check if reached exact end */ + if (nbSeq) return ERROR(corruption_detected); + /* save reps for next block */ + { U32 i; for (i=0; irep[i] = (U32)(seqState.prevOffset[i]); } + } + + /* last literal segment */ + { size_t const lastLLSize = litEnd - litPtr; + //if (litPtr > litEnd) return ERROR(corruption_detected); /* too many literals already used */ + if (lastLLSize > (size_t)(oend-op)) return ERROR(dstSize_tooSmall); + memcpy(op, litPtr, lastLLSize); + op += lastLLSize; + } + + return op-ostart; +} + + +static void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst) +{ + if (dst != dctx->previousDstEnd) { /* not contiguous */ + dctx->dictEnd = dctx->previousDstEnd; + dctx->vBase = (const char*)dst - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); + dctx->base = dst; + dctx->previousDstEnd = dst; + } +} + + +static size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ /* blockType == blockCompressed */ + const BYTE* ip = (const BYTE*)src; + + if (srcSize >= ZSTD_BLOCKSIZE_MAX) return ERROR(srcSize_wrong); + + /* Decode literals sub-block */ + { size_t const litCSize = ZSTD_decodeLiteralsBlock(dctx, src, srcSize); + if (ZSTD_isError(litCSize)) return litCSize; + ip += litCSize; + srcSize -= litCSize; + } + return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize); +} + + +size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + size_t dSize; + ZSTD_checkContinuity(dctx, dst); + dSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize); + dctx->previousDstEnd = (char*)dst + dSize; + return dSize; +} + + +/** ZSTD_insertBlock() : + insert `src` block into `dctx` history. Useful to track uncompressed blocks. */ +ZSTDLIB_API size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize) +{ + ZSTD_checkContinuity(dctx, blockStart); + dctx->previousDstEnd = (const char*)blockStart + blockSize; + return blockSize; +} + + +size_t ZSTD_generateNxBytes(void* dst, size_t dstCapacity, BYTE byte, size_t length) +{ + if (length > dstCapacity) return ERROR(dstSize_tooSmall); + memset(dst, byte, length); + return length; +} + + +/*! ZSTD_decompressFrame() : +* `dctx` must be properly initialized */ +static size_t ZSTD_decompressFrame(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + const BYTE* ip = (const BYTE*)src; + const BYTE* const iend = ip + srcSize; + BYTE* const ostart = (BYTE* const)dst; + BYTE* const oend = ostart + dstCapacity; + BYTE* op = ostart; + size_t remainingSize = srcSize; + + /* check */ + if (srcSize < ZSTD_frameHeaderSize_min+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); + + /* Frame Header */ + { size_t const frameHeaderSize = ZSTD_frameHeaderSize(src, ZSTD_frameHeaderSize_min); + if (ZSTD_isError(frameHeaderSize)) return frameHeaderSize; + if (srcSize < frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); + if (ZSTD_decodeFrameHeader(dctx, src, frameHeaderSize)) return ERROR(corruption_detected); + ip += frameHeaderSize; remainingSize -= frameHeaderSize; + } + + /* Loop on each block */ + while (1) { + size_t decodedSize; + blockProperties_t blockProperties; + size_t const cBlockSize = ZSTD_getcBlockSize(ip, iend-ip, &blockProperties); + if (ZSTD_isError(cBlockSize)) return cBlockSize; + + ip += ZSTD_blockHeaderSize; + remainingSize -= ZSTD_blockHeaderSize; + if (cBlockSize > remainingSize) return ERROR(srcSize_wrong); + + switch(blockProperties.blockType) + { + case bt_compressed: + decodedSize = ZSTD_decompressBlock_internal(dctx, op, oend-op, ip, cBlockSize); + break; + case bt_raw : + decodedSize = ZSTD_copyRawBlock(op, oend-op, ip, cBlockSize); + break; + case bt_rle : + decodedSize = ZSTD_generateNxBytes(op, oend-op, *ip, blockProperties.origSize); + break; + case bt_end : + /* end of frame */ + if (remainingSize) return ERROR(srcSize_wrong); + decodedSize = 0; + break; + default: + return ERROR(GENERIC); /* impossible */ + } + if (cBlockSize == 0) break; /* bt_end */ + + if (ZSTD_isError(decodedSize)) return decodedSize; + if (dctx->fParams.checksumFlag) XXH64_update(&dctx->xxhState, op, decodedSize); + op += decodedSize; + ip += cBlockSize; + remainingSize -= cBlockSize; + } + + return op-ostart; +} + + +/*! ZSTD_decompress_usingPreparedDCtx() : +* Same as ZSTD_decompress_usingDict, but using a reference context `preparedDCtx`, where dictionary has been loaded. +* It avoids reloading the dictionary each time. +* `preparedDCtx` must have been properly initialized using ZSTD_decompressBegin_usingDict(). +* Requires 2 contexts : 1 for reference (preparedDCtx), which will not be modified, and 1 to run the decompression operation (dctx) */ +size_t ZSTD_decompress_usingPreparedDCtx(ZSTD_DCtx* dctx, const ZSTD_DCtx* refDCtx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize) +{ + ZSTD_copyDCtx(dctx, refDCtx); + ZSTD_checkContinuity(dctx, dst); + return ZSTD_decompressFrame(dctx, dst, dstCapacity, src, srcSize); +} + + +size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict, size_t dictSize) +{ +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1) + if (ZSTD_isLegacy(src, srcSize)) return ZSTD_decompressLegacy(dst, dstCapacity, src, srcSize, dict, dictSize); +#endif + ZSTD_decompressBegin_usingDict(dctx, dict, dictSize); + ZSTD_checkContinuity(dctx, dst); + return ZSTD_decompressFrame(dctx, dst, dstCapacity, src, srcSize); +} + + +size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + return ZSTD_decompress_usingDict(dctx, dst, dstCapacity, src, srcSize, NULL, 0); +} + + +size_t ZSTD_decompress(void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ +#if defined(ZSTD_HEAPMODE) && (ZSTD_HEAPMODE==1) + size_t regenSize; + ZSTD_DCtx* const dctx = ZSTD_createDCtx(); + if (dctx==NULL) return ERROR(memory_allocation); + regenSize = ZSTD_decompressDCtx(dctx, dst, dstCapacity, src, srcSize); + ZSTD_freeDCtx(dctx); + return regenSize; +#else /* stack mode */ + ZSTD_DCtx dctx; + return ZSTD_decompressDCtx(&dctx, dst, dstCapacity, src, srcSize); +#endif +} + + +/*_****************************** +* Streaming Decompression API +********************************/ +size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) +{ + return dctx->expected; +} + +int ZSTD_isSkipFrame(ZSTD_DCtx* dctx) +{ + return dctx->stage == ZSTDds_skipFrame; +} + +/** ZSTD_decompressContinue() : +* @return : nb of bytes generated into `dst` (necessarily <= `dstCapacity) +* or an error code, which can be tested using ZSTD_isError() */ +size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) +{ + /* Sanity check */ + if (srcSize != dctx->expected) return ERROR(srcSize_wrong); + if (dstCapacity) ZSTD_checkContinuity(dctx, dst); + + switch (dctx->stage) + { + case ZSTDds_getFrameHeaderSize : + if (srcSize != ZSTD_frameHeaderSize_min) return ERROR(srcSize_wrong); /* impossible */ + if ((MEM_readLE32(src) & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START) { + memcpy(dctx->headerBuffer, src, ZSTD_frameHeaderSize_min); + dctx->expected = ZSTD_skippableHeaderSize - ZSTD_frameHeaderSize_min; /* magic number + skippable frame length */ + dctx->stage = ZSTDds_decodeSkippableHeader; + return 0; + } + dctx->headerSize = ZSTD_frameHeaderSize(src, ZSTD_frameHeaderSize_min); + if (ZSTD_isError(dctx->headerSize)) return dctx->headerSize; + memcpy(dctx->headerBuffer, src, ZSTD_frameHeaderSize_min); + if (dctx->headerSize > ZSTD_frameHeaderSize_min) { + dctx->expected = dctx->headerSize - ZSTD_frameHeaderSize_min; + dctx->stage = ZSTDds_decodeFrameHeader; + return 0; + } + dctx->expected = 0; /* not necessary to copy more */ + + case ZSTDds_decodeFrameHeader: + { size_t result; + memcpy(dctx->headerBuffer + ZSTD_frameHeaderSize_min, src, dctx->expected); + result = ZSTD_decodeFrameHeader(dctx, dctx->headerBuffer, dctx->headerSize); + if (ZSTD_isError(result)) return result; + dctx->expected = ZSTD_blockHeaderSize; + dctx->stage = ZSTDds_decodeBlockHeader; + return 0; + } + case ZSTDds_decodeBlockHeader: + { blockProperties_t bp; + size_t const cBlockSize = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp); + if (ZSTD_isError(cBlockSize)) return cBlockSize; + if (bp.blockType == bt_end) { + if (dctx->fParams.checksumFlag) { + U64 const h64 = XXH64_digest(&dctx->xxhState); + U32 const h32 = (U32)(h64>>11) & ((1<<22)-1); + const BYTE* const ip = (const BYTE*)src; + U32 const check32 = ip[2] + (ip[1] << 8) + ((ip[0] & 0x3F) << 16); + if (check32 != h32) return ERROR(checksum_wrong); + } + dctx->expected = 0; + dctx->stage = ZSTDds_getFrameHeaderSize; + } else { + dctx->expected = cBlockSize; + dctx->bType = bp.blockType; + dctx->stage = ZSTDds_decompressBlock; + } + return 0; + } + case ZSTDds_decompressBlock: + { size_t rSize; + switch(dctx->bType) + { + case bt_compressed: + rSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize); + break; + case bt_raw : + rSize = ZSTD_copyRawBlock(dst, dstCapacity, src, srcSize); + break; + case bt_rle : + return ERROR(GENERIC); /* not yet handled */ + break; + case bt_end : /* should never happen (filtered at phase 1) */ + rSize = 0; + break; + default: + return ERROR(GENERIC); /* impossible */ + } + dctx->stage = ZSTDds_decodeBlockHeader; + dctx->expected = ZSTD_blockHeaderSize; + dctx->previousDstEnd = (char*)dst + rSize; + if (ZSTD_isError(rSize)) return rSize; + if (dctx->fParams.checksumFlag) XXH64_update(&dctx->xxhState, dst, rSize); + return rSize; + } + case ZSTDds_decodeSkippableHeader: + { memcpy(dctx->headerBuffer + ZSTD_frameHeaderSize_min, src, dctx->expected); + dctx->expected = MEM_readLE32(dctx->headerBuffer + 4); + dctx->stage = ZSTDds_skipFrame; + return 0; + } + case ZSTDds_skipFrame: + { dctx->expected = 0; + dctx->stage = ZSTDds_getFrameHeaderSize; + return 0; + } + default: + return ERROR(GENERIC); /* impossible */ + } +} + + +static size_t ZSTD_refDictContent(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + dctx->dictEnd = dctx->previousDstEnd; + dctx->vBase = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); + dctx->base = dict; + dctx->previousDstEnd = (const char*)dict + dictSize; + return 0; +} + +static size_t ZSTD_loadEntropy(ZSTD_DCtx* dctx, const void* const dict, size_t const dictSize) +{ + const BYTE* dictPtr = (const BYTE*)dict; + const BYTE* const dictEnd = dictPtr + dictSize; + + { size_t const hSize = HUF_readDTableX4(dctx->hufTable, dict, dictSize); + if (HUF_isError(hSize)) return ERROR(dictionary_corrupted); + dictPtr += hSize; + } + + { short offcodeNCount[MaxOff+1]; + U32 offcodeMaxValue=MaxOff, offcodeLog=OffFSELog; + size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildDTable(dctx->OffTable, offcodeNCount, offcodeMaxValue, offcodeLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += offcodeHeaderSize; + } + + { short matchlengthNCount[MaxML+1]; + unsigned matchlengthMaxValue = MaxML, matchlengthLog = MLFSELog; + size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildDTable(dctx->MLTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += matchlengthHeaderSize; + } + + { short litlengthNCount[MaxLL+1]; + unsigned litlengthMaxValue = MaxLL, litlengthLog = LLFSELog; + size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr); + if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted); + { size_t const errorCode = FSE_buildDTable(dctx->LLTable, litlengthNCount, litlengthMaxValue, litlengthLog); + if (FSE_isError(errorCode)) return ERROR(dictionary_corrupted); } + dictPtr += litlengthHeaderSize; + } + + if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted); + dctx->rep[0] = MEM_readLE32(dictPtr+0); if (dctx->rep[0] >= dictSize) return ERROR(dictionary_corrupted); + dctx->rep[1] = MEM_readLE32(dictPtr+4); if (dctx->rep[1] >= dictSize) return ERROR(dictionary_corrupted); + dctx->rep[2] = MEM_readLE32(dictPtr+8); if (dctx->rep[2] >= dictSize) return ERROR(dictionary_corrupted); + dictPtr += 12; + + dctx->litEntropy = dctx->fseEntropy = 1; + return dictPtr - (const BYTE*)dict; +} + +static size_t ZSTD_decompress_insertDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + if (dictSize < 8) return ZSTD_refDictContent(dctx, dict, dictSize); + { U32 const magic = MEM_readLE32(dict); + if (magic != ZSTD_DICT_MAGIC) { + return ZSTD_refDictContent(dctx, dict, dictSize); /* pure content mode */ + } } + dctx->dictID = MEM_readLE32((const char*)dict + 4); + + /* load entropy tables */ + dict = (const char*)dict + 8; + dictSize -= 8; + { size_t const eSize = ZSTD_loadEntropy(dctx, dict, dictSize); + if (ZSTD_isError(eSize)) return ERROR(dictionary_corrupted); + dict = (const char*)dict + eSize; + dictSize -= eSize; + } + + /* reference dictionary content */ + return ZSTD_refDictContent(dctx, dict, dictSize); +} + + +size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize) +{ + { size_t const errorCode = ZSTD_decompressBegin(dctx); + if (ZSTD_isError(errorCode)) return errorCode; } + + if (dict && dictSize) { + size_t const errorCode = ZSTD_decompress_insertDictionary(dctx, dict, dictSize); + if (ZSTD_isError(errorCode)) return ERROR(dictionary_corrupted); + } + + return 0; +} + + +struct ZSTD_DDict_s { + void* dict; + size_t dictSize; + ZSTD_DCtx* refContext; +}; /* typedef'd tp ZSTD_CDict within zstd.h */ + +ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize, ZSTD_customMem customMem) +{ + if (!customMem.customAlloc && !customMem.customFree) + customMem = defaultCustomMem; + + if (!customMem.customAlloc || !customMem.customFree) + return NULL; + + { ZSTD_DDict* const ddict = (ZSTD_DDict*) customMem.customAlloc(customMem.opaque, sizeof(*ddict)); + void* const dictContent = customMem.customAlloc(customMem.opaque, dictSize); + ZSTD_DCtx* const dctx = ZSTD_createDCtx_advanced(customMem); + + if (!dictContent || !ddict || !dctx) { + customMem.customFree(customMem.opaque, dictContent); + customMem.customFree(customMem.opaque, ddict); + customMem.customFree(customMem.opaque, dctx); + return NULL; + } + + memcpy(dictContent, dict, dictSize); + { size_t const errorCode = ZSTD_decompressBegin_usingDict(dctx, dictContent, dictSize); + if (ZSTD_isError(errorCode)) { + customMem.customFree(customMem.opaque, dictContent); + customMem.customFree(customMem.opaque, ddict); + customMem.customFree(customMem.opaque, dctx); + return NULL; + } } + + ddict->dict = dictContent; + ddict->dictSize = dictSize; + ddict->refContext = dctx; + return ddict; + } +} + +/*! ZSTD_createDDict() : +* Create a digested dictionary, ready to start decompression without startup delay. +* `dict` can be released after `ZSTD_DDict` creation */ +ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize) +{ + ZSTD_customMem const allocator = { NULL, NULL, NULL }; + return ZSTD_createDDict_advanced(dict, dictSize, allocator); +} + +size_t ZSTD_freeDDict(ZSTD_DDict* ddict) +{ + ZSTD_freeFunction const cFree = ddict->refContext->customMem.customFree; + void* const opaque = ddict->refContext->customMem.opaque; + ZSTD_freeDCtx(ddict->refContext); + cFree(opaque, ddict->dict); + cFree(opaque, ddict); + return 0; +} + +/*! ZSTD_decompress_usingDDict() : +* Decompression using a pre-digested Dictionary +* Use dictionary without significant overhead. */ +ZSTDLIB_API size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTD_DDict* ddict) +{ +#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT==1) + if (ZSTD_isLegacy(src, srcSize)) return ZSTD_decompressLegacy(dst, dstCapacity, src, srcSize, ddict->dict, ddict->dictSize); +#endif + return ZSTD_decompress_usingPreparedDCtx(dctx, ddict->refContext, + dst, dstCapacity, + src, srcSize); +} diff --git a/uppsrc/plugin/zstd/import.ext b/uppsrc/plugin/zstd/import.ext new file mode 100644 index 000000000..2c9d16c83 --- /dev/null +++ b/uppsrc/plugin/zstd/import.ext @@ -0,0 +1,3 @@ +files *.c; + +includes *.h *.hpp; \ No newline at end of file diff --git a/uppsrc/plugin/zstd/init b/uppsrc/plugin/zstd/init new file mode 100644 index 000000000..b2d85c0d1 --- /dev/null +++ b/uppsrc/plugin/zstd/init @@ -0,0 +1,3 @@ +#ifndef _plugin_zstd_icpp_init_stub +#define _plugin_zstd_icpp_init_stub +#endif diff --git a/uppsrc/plugin/zstd/zstd.h b/uppsrc/plugin/zstd/zstd.h new file mode 100644 index 000000000..efa19cc61 --- /dev/null +++ b/uppsrc/plugin/zstd/zstd.h @@ -0,0 +1,119 @@ +#ifndef _plugin_zstd_zstd_h_ +#define _plugin_zstd_zstd_h_ + +#include + +#define ZSTD_STATIC_LINKING_ONLY +#include "common/zstd.h" + +namespace Upp { + +class ZstdCompressStream : public Stream { +public: + virtual void Close(); + virtual bool IsOpen() const; + +protected: + virtual void _Put(int w); + virtual void _Put(const void *data, dword size); + + Stream *out; + + Buffer buffer; + Buffer outbuf; + Buffer outsz; + + enum { BLOCK_BYTES = 1024*1024 }; + + int level; + + bool concurrent; + + void Alloc(); + void Init(); + void FlushOut(); + +public: +#ifdef _MULTITHREADED + void Concurrent(bool b = true); +#endif + void Open(Stream& out, int level = 1); + + ZstdCompressStream(); + ZstdCompressStream(Stream& out, int level = 1) : ZstdCompressStream() { Open(out, level); } + ~ZstdCompressStream(); +}; + +class ZstdDecompressStream : public Stream { +public: + virtual bool IsOpen() const; + +protected: + virtual int _Term(); + virtual int _Get(); + virtual dword _Get(void *data, dword size); + +private: + Stream *in; + struct Workblock { + Buffer c, d; // compressed, decompressed data + int clen = 0, dlen = 0; // compressed, decompressed len + String lc; // used when compressed length is too big + bool irregular_d = false; // d reallocated to accomodate bigger result + + void Clear() { c.Clear(); d.Clear(); lc.Clear(); } + }; + Workblock wb[16]; + int count; // count of workblocks fetched + int ii; // next workblock to be read + int dlen; // length of current workblock + + enum { BLOCK_BYTES = 1024*1024 }; // expected decompressed size + + int maxblock; + int blockchksumsz; + byte lz4hdr; + bool eof; + + bool concurrent; + + void TryHeader(); + + void Init(); + bool Next(); + void Fetch(); + +public: + bool Open(Stream& in); + +#ifdef _MULTITHREADED + void Concurrent(bool b = true) { concurrent = b; } +#endif + + ZstdDecompressStream(); + ZstdDecompressStream(Stream& in) : ZstdDecompressStream() { Open(in); } + ~ZstdDecompressStream(); +}; + + +int64 ZstdCompress(Stream& out, Stream& in, Gate2 progress = false); +int64 ZstdDecompress(Stream& out, Stream& in, Gate2 progress = false); +String ZstdCompress(const void *data, int64 len, Gate2 progress = false); +String ZstdCompress(const String& s, Gate2 progress = false); +String ZstdDecompress(const void *data, int64 len, Gate2 progress = false); +String ZstdDecompress(const String& s, Gate2 progress = false); + +#ifdef _MULTITHREADED +int64 CoZstdCompress(Stream& out, Stream& in, Gate2 progress = false); +int64 CoZstdDecompress(Stream& out, Stream& in, Gate2 progress = false); +String CoZstdCompress(const void *data, int64 len, Gate2 progress = false); +String CoZstdCompress(const String& s, Gate2 progress = false); +String CoZstdDecompress(const void *data, int64 len, Gate2 progress = false); +String CoZstdDecompress(const String& s, Gate2 progress = false); +#endif + +bool IsZstd(Stream& s); + +}; + +#endif diff --git a/uppsrc/plugin/zstd/zstd.upp b/uppsrc/plugin/zstd/zstd.upp new file mode 100644 index 000000000..69c1f4f22 --- /dev/null +++ b/uppsrc/plugin/zstd/zstd.upp @@ -0,0 +1,9 @@ +description "\3770,128,128"; + +file + import.ext, + zstd.h, + Compress.cpp, + Decompress.cpp, + common\zstd.h; +