ultimatepp/bazaar/plugin/gdal/frmts/aigrid/gridlib.c
cxl 23ff1e7e82 .gdal moved to bazaar
git-svn-id: svn://ultimatepp.org/upp/trunk@9273 f0d560ea-af0d-0410-9eb7-867de7ffcac7
2015-12-07 13:36:24 +00:00

1097 lines
38 KiB
C

/******************************************************************************
* $Id: gridlib.c 27044 2014-03-16 23:41:27Z rouault $
*
* Project: Arc/Info Binary Grid Translator
* Purpose: Grid file reading code.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2007-2010, Even Rouault <even dot rouault at mines-paris dot org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "aigrid.h"
CPL_CVSID("$Id: gridlib.c 27044 2014-03-16 23:41:27Z rouault $");
/************************************************************************/
/* AIGProcessRaw32bitFloatBlock() */
/* */
/* Process a block using ``00'' (32 bit) raw format. */
/************************************************************************/
static
CPLErr AIGProcessRaw32BitFloatBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
float * pafData )
{
int i;
(void) nMin;
if( nDataSize < nBlockXSize*nBlockYSize*4 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
float fWork;
#ifdef CPL_LSB
((GByte *) &fWork)[3] = *(pabyCur++);
((GByte *) &fWork)[2] = *(pabyCur++);
((GByte *) &fWork)[1] = *(pabyCur++);
((GByte *) &fWork)[0] = *(pabyCur++);
#else
((GByte *) &fWork)[0] = *(pabyCur++);
((GByte *) &fWork)[1] = *(pabyCur++);
((GByte *) &fWork)[2] = *(pabyCur++);
((GByte *) &fWork)[3] = *(pabyCur++);
#endif
pafData[i] = fWork;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcessIntConstBlock() */
/* */
/* Process a block using ``00'' constant 32bit integer format. */
/************************************************************************/
static
CPLErr AIGProcessIntConstBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
int i;
(void) pabyCur;
(void) nDataSize;
/* -------------------------------------------------------------------- */
/* Apply constant min value. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
panData[i] = nMin;
return( CE_None );
}
/************************************************************************/
/* AIGProcess32bitRawBlock() */
/* */
/* Process a block using ``20'' (thirtytwo bit) raw format. */
/************************************************************************/
static
CPLErr AIGProcessRaw32BitBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
int i;
if( nDataSize < nBlockXSize*nBlockYSize*4 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
panData[i] = pabyCur[0] * 256 * 256 * 256
+ pabyCur[1] * 256 * 256
+ pabyCur[2] * 256
+ pabyCur[3] + nMin;
pabyCur += 4;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcess16bitRawBlock() */
/* */
/* Process a block using ``10'' (sixteen bit) raw format. */
/************************************************************************/
static
CPLErr AIGProcessRaw16BitBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
int i;
if( nDataSize < nBlockXSize*nBlockYSize*2 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
panData[i] = pabyCur[0] * 256 + pabyCur[1] + nMin;
pabyCur += 2;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcess4BitRawBlock() */
/* */
/* Process a block using ``08'' raw format. */
/************************************************************************/
static
CPLErr AIGProcessRaw4BitBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
int i;
if( nDataSize < (nBlockXSize*nBlockYSize+1)/2 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
if( i % 2 == 0 )
panData[i] = ((*(pabyCur) & 0xf0) >> 4) + nMin;
else
panData[i] = (*(pabyCur++) & 0xf) + nMin;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcess1BitRawBlock() */
/* */
/* Process a block using ``0x01'' raw format. */
/************************************************************************/
static
CPLErr AIGProcessRaw1BitBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
int i;
if( nDataSize < (nBlockXSize*nBlockYSize+7)/8 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
if( pabyCur[i>>3] & (0x80 >> (i&0x7)) )
panData[i] = 1 + nMin;
else
panData[i] = 0 + nMin;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcessRawBlock() */
/* */
/* Process a block using ``08'' raw format. */
/************************************************************************/
static
CPLErr AIGProcessRawBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize, GInt32 * panData )
{
int i;
if( nDataSize < nBlockXSize*nBlockYSize )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Collect raw data. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
panData[i] = *(pabyCur++) + nMin;
}
return( CE_None );
}
/************************************************************************/
/* AIGProcessFFBlock() */
/* */
/* Process a type 0xFF (CCITT RLE) compressed block. */
/************************************************************************/
static
CPLErr AIGProcessFFBlock( GByte *pabyCur, int nDataSize, int nMin,
int nBlockXSize, int nBlockYSize,
GInt32 * panData )
{
/* -------------------------------------------------------------------- */
/* Convert CCITT compress bitstream into 1bit raw data. */
/* -------------------------------------------------------------------- */
CPLErr eErr;
int i, nDstBytes = (nBlockXSize * nBlockYSize + 7) / 8;
unsigned char *pabyIntermediate;
pabyIntermediate = (unsigned char *) VSIMalloc(nDstBytes);
if (pabyIntermediate == NULL)
{
CPLError(CE_Failure, CPLE_OutOfMemory,
"Cannot allocate %d bytes", nDstBytes);
return CE_Failure;
}
eErr = DecompressCCITTRLETile( pabyCur, nDataSize,
pabyIntermediate, nDstBytes,
nBlockXSize, nBlockYSize );
if( eErr != CE_None )
{
CPLFree(pabyIntermediate);
return eErr;
}
/* -------------------------------------------------------------------- */
/* Convert the bit buffer into 32bit integers and account for */
/* nMin. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
{
if( pabyIntermediate[i>>3] & (0x80 >> (i&0x7)) )
panData[i] = nMin+1;
else
panData[i] = nMin;
}
CPLFree( pabyIntermediate );
return( CE_None );
}
/************************************************************************/
/* AIGProcessBlock() */
/* */
/* Process a block using ``D7'', ``E0'' or ``DF'' compression. */
/************************************************************************/
static
CPLErr AIGProcessBlock( GByte *pabyCur, int nDataSize, int nMin, int nMagic,
int nBlockXSize, int nBlockYSize, GInt32 * panData )
{
int nTotPixels, nPixels;
int i;
/* ==================================================================== */
/* Process runs till we are done. */
/* ==================================================================== */
nTotPixels = nBlockXSize * nBlockYSize;
nPixels = 0;
while( nPixels < nTotPixels && nDataSize > 0 )
{
int nMarker = *(pabyCur++);
nDataSize--;
/* -------------------------------------------------------------------- */
/* Repeat data - four byte data block (0xE0) */
/* -------------------------------------------------------------------- */
if( nMagic == 0xE0 )
{
GInt32 nValue;
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
if( nDataSize < 4 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
nValue = 0;
memcpy( &nValue, pabyCur, 4 );
pabyCur += 4;
nDataSize -= 4;
nValue = CPL_MSBWORD32( nValue );
nValue += nMin;
for( i = 0; i < nMarker; i++ )
panData[nPixels++] = nValue;
}
/* -------------------------------------------------------------------- */
/* Repeat data - two byte data block (0xF0) */
/* -------------------------------------------------------------------- */
else if( nMagic == 0xF0 )
{
GInt32 nValue;
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
if( nDataSize < 2 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
nValue = (pabyCur[0] * 256 + pabyCur[1]) + nMin;
pabyCur += 2;
nDataSize -= 2;
for( i = 0; i < nMarker; i++ )
panData[nPixels++] = nValue;
}
/* -------------------------------------------------------------------- */
/* Repeat data - one byte data block (0xFC) */
/* -------------------------------------------------------------------- */
else if( nMagic == 0xFC || nMagic == 0xF8 )
{
GInt32 nValue;
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
if( nDataSize < 1 )
{
CPLError(CE_Failure, CPLE_AppDefined, "Block too small");
return CE_Failure;
}
nValue = *(pabyCur++) + nMin;
nDataSize--;
for( i = 0; i < nMarker; i++ )
panData[nPixels++] = nValue;
}
/* -------------------------------------------------------------------- */
/* Repeat data - no actual data, just assign minimum (0xDF) */
/* -------------------------------------------------------------------- */
else if( nMagic == 0xDF && nMarker < 128 )
{
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
for( i = 0; i < nMarker; i++ )
panData[nPixels++] = nMin;
}
/* -------------------------------------------------------------------- */
/* Literal data (0xD7): 8bit values. */
/* -------------------------------------------------------------------- */
else if( nMagic == 0xD7 && nMarker < 128 )
{
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
while( nMarker > 0 && nDataSize > 0 )
{
panData[nPixels++] = *(pabyCur++) + nMin;
nMarker--;
nDataSize--;
}
}
/* -------------------------------------------------------------------- */
/* Literal data (0xCF): 16 bit values. */
/* -------------------------------------------------------------------- */
else if( nMagic == 0xCF && nMarker < 128 )
{
GInt32 nValue;
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
while( nMarker > 0 && nDataSize >= 2 )
{
nValue = pabyCur[0] * 256 + pabyCur[1] + nMin;
panData[nPixels++] = nValue;
pabyCur += 2;
nMarker--;
nDataSize -= 2;
}
}
/* -------------------------------------------------------------------- */
/* Nodata repeat */
/* -------------------------------------------------------------------- */
else if( nMarker > 128 )
{
nMarker = 256 - nMarker;
if( nMarker + nPixels > nTotPixels )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Run too long in AIGProcessBlock, needed %d values, got %d.",
nTotPixels - nPixels, nMarker );
return CE_Failure;
}
while( nMarker > 0 )
{
panData[nPixels++] = ESRI_GRID_NO_DATA;
nMarker--;
}
}
else
{
return CE_Failure;
}
}
if( nPixels < nTotPixels || nDataSize < 0 )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Ran out of data processing block with nMagic=%d.",
nMagic );
return CE_Failure;
}
return CE_None;
}
/************************************************************************/
/* AIGReadBlock() */
/* */
/* Read a single block of integer grid data. */
/************************************************************************/
CPLErr AIGReadBlock( VSILFILE * fp, GUInt32 nBlockOffset, int nBlockSize,
int nBlockXSize, int nBlockYSize,
GInt32 *panData, int nCellType, int bCompressed )
{
GByte *pabyRaw, *pabyCur;
CPLErr eErr;
int i, nMagic, nMinSize=0, nDataSize;
GInt32 nMin = 0;
/* -------------------------------------------------------------------- */
/* If the block has zero size it is all dummies. */
/* -------------------------------------------------------------------- */
if( nBlockSize == 0 )
{
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
panData[i] = ESRI_GRID_NO_DATA;
return( CE_None );
}
/* -------------------------------------------------------------------- */
/* Read the block into memory. */
/* -------------------------------------------------------------------- */
if (nBlockSize <= 0 || nBlockSize > 65535 * 2)
{
CPLError(CE_Failure, CPLE_AppDefined, "Invalid block size : %d", nBlockSize);
return CE_Failure;
}
pabyRaw = (GByte *) VSIMalloc(nBlockSize+2);
if (pabyRaw == NULL)
{
CPLError(CE_Failure, CPLE_AppDefined, "Cannot allocate memory for block");
return CE_Failure;
}
if( VSIFSeekL( fp, nBlockOffset, SEEK_SET ) != 0
|| VSIFReadL( pabyRaw, nBlockSize+2, 1, fp ) != 1 )
{
memset( panData, 0, nBlockXSize*nBlockYSize*4 );
CPLError( CE_Failure, CPLE_AppDefined,
"Read of %d bytes from offset %d for grid block failed.",
nBlockSize+2, nBlockOffset );
CPLFree( pabyRaw );
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Verify the block size. */
/* -------------------------------------------------------------------- */
if( nBlockSize != (pabyRaw[0]*256 + pabyRaw[1])*2 )
{
memset( panData, 0, nBlockXSize*nBlockYSize*4 );
CPLError( CE_Failure, CPLE_AppDefined,
"Block is corrupt, block size was %d, but expected to be %d.",
(pabyRaw[0]*256 + pabyRaw[1])*2, nBlockSize );
CPLFree( pabyRaw );
return CE_Failure;
}
nDataSize = nBlockSize;
/* -------------------------------------------------------------------- */
/* Handle float files and uncompressed integer files directly. */
/* -------------------------------------------------------------------- */
if( nCellType == AIG_CELLTYPE_FLOAT )
{
AIGProcessRaw32BitFloatBlock( pabyRaw + 2, nDataSize, 0,
nBlockXSize, nBlockYSize,
(float *) panData );
CPLFree( pabyRaw );
return CE_None;
}
if( nCellType == AIG_CELLTYPE_INT && !bCompressed )
{
AIGProcessRaw32BitBlock( pabyRaw+2, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
CPLFree( pabyRaw );
return CE_None;
}
/* -------------------------------------------------------------------- */
/* Collect minimum value. */
/* -------------------------------------------------------------------- */
/* The first 2 bytes that give the block size are not included in nDataSize */
/* and have already been safely read */
pabyCur = pabyRaw + 2;
/* Need at least 2 byte to read the nMinSize and the nMagic */
if (nDataSize < 2)
{
CPLError( CE_Failure, CPLE_AppDefined,
"Corrupt block. Need 2 bytes to read nMagic and nMinSize, only %d available",
nDataSize);
CPLFree( pabyRaw );
return CE_Failure;
}
nMagic = pabyCur[0];
nMinSize = pabyCur[1];
pabyCur += 2;
nDataSize -= 2;
/* Need at least nMinSize bytes to read the nMin value */
if (nDataSize < nMinSize)
{
CPLError( CE_Failure, CPLE_AppDefined,
"Corrupt block. Need %d bytes to read nMin. Only %d available",
nMinSize, nDataSize);
CPLFree( pabyRaw );
return CE_Failure;
}
if( nMinSize > 4 )
{
memset( panData, 0, nBlockXSize*nBlockYSize*4 );
CPLError( CE_Failure, CPLE_AppDefined,
"Corrupt 'minsize' of %d in block header. Read aborted.",
nMinSize );
CPLFree( pabyRaw );
return CE_Failure;
}
if( nMinSize == 4 )
{
memcpy( &nMin, pabyCur, 4 );
nMin = CPL_MSBWORD32( nMin );
pabyCur += 4;
}
else
{
nMin = 0;
for( i = 0; i < nMinSize; i++ )
{
nMin = nMin * 256 + *pabyCur;
pabyCur++;
}
/* If nMinSize = 0, then we might have only 4 bytes in pabyRaw */
/* don't try to read the 5th one then */
if( nMinSize != 0 && pabyRaw[4] > 127 )
{
if( nMinSize == 2 )
nMin = nMin - 65536;
else if( nMinSize == 1 )
nMin = nMin - 256;
else if( nMinSize == 3 )
nMin = nMin - 256*256*256;
}
}
nDataSize -= nMinSize;
/* -------------------------------------------------------------------- */
/* Call an apppropriate handler depending on magic code. */
/* -------------------------------------------------------------------- */
if( nMagic == 0x08 )
{
AIGProcessRawBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else if( nMagic == 0x04 )
{
AIGProcessRaw4BitBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else if( nMagic == 0x01 )
{
AIGProcessRaw1BitBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else if( nMagic == 0x00 )
{
AIGProcessIntConstBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize, panData );
}
else if( nMagic == 0x10 )
{
AIGProcessRaw16BitBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else if( nMagic == 0x20 )
{
AIGProcessRaw32BitBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else if( nMagic == 0xFF )
{
AIGProcessFFBlock( pabyCur, nDataSize, nMin,
nBlockXSize, nBlockYSize,
panData );
}
else
{
eErr = AIGProcessBlock( pabyCur, nDataSize, nMin, nMagic,
nBlockXSize, nBlockYSize, panData );
if( eErr == CE_Failure )
{
static int bHasWarned = FALSE;
for( i = 0; i < nBlockXSize * nBlockYSize; i++ )
panData[i] = ESRI_GRID_NO_DATA;
if( !bHasWarned )
{
CPLError( CE_Warning, CPLE_AppDefined,
"Unsupported Arc/Info Binary Grid tile of type 0x%X"
" encountered.\n"
"This and subsequent unsupported tile types set to"
" no data value.\n",
nMagic );
bHasWarned = TRUE;
}
}
}
CPLFree( pabyRaw );
return CE_None;
}
/************************************************************************/
/* AIGReadHeader() */
/* */
/* Read the hdr.adf file, and populate the given info structure */
/* appropriately. */
/************************************************************************/
CPLErr AIGReadHeader( const char * pszCoverName, AIGInfo_t * psInfo )
{
char *pszHDRFilename;
VSILFILE *fp;
GByte abyData[308];
/* -------------------------------------------------------------------- */
/* Open the file hdr.adf file. */
/* -------------------------------------------------------------------- */
pszHDRFilename = (char *) CPLMalloc(strlen(pszCoverName)+30);
sprintf( pszHDRFilename, "%s/hdr.adf", pszCoverName );
fp = AIGLLOpen( pszHDRFilename, "rb" );
if( fp == NULL )
{
CPLError( CE_Failure, CPLE_OpenFailed,
"Failed to open grid header file:\n%s\n", pszHDRFilename );
CPLFree( pszHDRFilename );
return( CE_Failure );
}
CPLFree( pszHDRFilename );
/* -------------------------------------------------------------------- */
/* Read the whole file (we expect it to always be 308 bytes */
/* long. */
/* -------------------------------------------------------------------- */
VSIFReadL( abyData, 1, 308, fp );
VSIFCloseL( fp );
/* -------------------------------------------------------------------- */
/* Read the block size information. */
/* -------------------------------------------------------------------- */
memcpy( &(psInfo->nCellType), abyData+16, 4 );
memcpy( &(psInfo->bCompressed), abyData+20, 4 );
memcpy( &(psInfo->nBlocksPerRow), abyData+288, 4 );
memcpy( &(psInfo->nBlocksPerColumn), abyData+292, 4 );
memcpy( &(psInfo->nBlockXSize), abyData+296, 4 );
memcpy( &(psInfo->nBlockYSize), abyData+304, 4 );
memcpy( &(psInfo->dfCellSizeX), abyData+256, 8 );
memcpy( &(psInfo->dfCellSizeY), abyData+264, 8 );
#ifdef CPL_LSB
psInfo->nCellType = CPL_SWAP32( psInfo->nCellType );
psInfo->bCompressed = CPL_SWAP32( psInfo->bCompressed );
psInfo->nBlocksPerRow = CPL_SWAP32( psInfo->nBlocksPerRow );
psInfo->nBlocksPerColumn = CPL_SWAP32( psInfo->nBlocksPerColumn );
psInfo->nBlockXSize = CPL_SWAP32( psInfo->nBlockXSize );
psInfo->nBlockYSize = CPL_SWAP32( psInfo->nBlockYSize );
CPL_SWAPDOUBLE( &(psInfo->dfCellSizeX) );
CPL_SWAPDOUBLE( &(psInfo->dfCellSizeY) );
#endif
psInfo->bCompressed = !psInfo->bCompressed;
return( CE_None );
}
/************************************************************************/
/* AIGReadBlockIndex() */
/* */
/* Read the w001001x.adf file, and populate the given info */
/* structure with the block offsets, and sizes. */
/************************************************************************/
CPLErr AIGReadBlockIndex( AIGInfo_t * psInfo, AIGTileInfo *psTInfo,
const char *pszBasename )
{
char *pszHDRFilename;
VSILFILE *fp;
int nLength, i;
GInt32 nValue;
GUInt32 *panIndex;
GByte abyHeader[8];
/* -------------------------------------------------------------------- */
/* Open the file hdr.adf file. */
/* -------------------------------------------------------------------- */
pszHDRFilename = (char *) CPLMalloc(strlen(psInfo->pszCoverName)+40);
sprintf( pszHDRFilename, "%s/%sx.adf", psInfo->pszCoverName, pszBasename );
fp = AIGLLOpen( pszHDRFilename, "rb" );
if( fp == NULL )
{
CPLError( CE_Failure, CPLE_OpenFailed,
"Failed to open grid block index file:\n%s\n",
pszHDRFilename );
CPLFree( pszHDRFilename );
return( CE_Failure );
}
CPLFree( pszHDRFilename );
/* -------------------------------------------------------------------- */
/* Verify the magic number. This is often corrupted by CR/LF */
/* translation. */
/* -------------------------------------------------------------------- */
VSIFReadL( abyHeader, 1, 8, fp );
if( abyHeader[3] == 0x0D && abyHeader[4] == 0x0A )
{
CPLError( CE_Failure, CPLE_AppDefined,
"w001001x.adf file header has been corrupted by unix to dos text conversion." );
VSIFCloseL( fp );
return CE_Failure;
}
if( abyHeader[0] != 0x00
|| abyHeader[1] != 0x00
|| abyHeader[2] != 0x27
|| abyHeader[3] != 0x0A
|| abyHeader[4] != 0xFF
|| abyHeader[5] != 0xFF )
{
CPLError( CE_Failure, CPLE_AppDefined,
"w001001x.adf file header magic number is corrupt." );
VSIFCloseL( fp );
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Get the file length (in 2 byte shorts) */
/* -------------------------------------------------------------------- */
VSIFSeekL( fp, 24, SEEK_SET );
VSIFReadL( &nValue, 1, 4, fp );
// FIXME? : risk of overflow in multiplication
nLength = CPL_MSBWORD32(nValue) * 2;
/* -------------------------------------------------------------------- */
/* Allocate buffer, and read the file (from beyond the header) */
/* into the buffer. */
/* -------------------------------------------------------------------- */
psTInfo->nBlocks = (nLength-100) / 8;
panIndex = (GUInt32 *) VSIMalloc2(psTInfo->nBlocks, 8);
if (panIndex == NULL)
{
CPLError(CE_Failure, CPLE_OutOfMemory,
"AIGReadBlockIndex: Out of memory. Probably due to corrupted w001001x.adf file");
VSIFCloseL( fp );
return CE_Failure;
}
VSIFSeekL( fp, 100, SEEK_SET );
if ((int)VSIFReadL( panIndex, 8, psTInfo->nBlocks, fp ) != psTInfo->nBlocks)
{
CPLError(CE_Failure, CPLE_AppDefined,
"AIGReadBlockIndex: Cannot read block info");
VSIFCloseL( fp );
CPLFree( panIndex );
return CE_Failure;
}
VSIFCloseL( fp );
/* -------------------------------------------------------------------- */
/* Allocate AIGInfo block info arrays. */
/* -------------------------------------------------------------------- */
psTInfo->panBlockOffset = (GUInt32 *) VSIMalloc2(4, psTInfo->nBlocks);
psTInfo->panBlockSize = (int *) VSIMalloc2(4, psTInfo->nBlocks);
if (psTInfo->panBlockOffset == NULL ||
psTInfo->panBlockSize == NULL)
{
CPLError(CE_Failure, CPLE_OutOfMemory,
"AIGReadBlockIndex: Out of memory. Probably due to corrupted w001001x.adf file");
CPLFree( psTInfo->panBlockOffset );
CPLFree( psTInfo->panBlockSize );
CPLFree( panIndex );
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Populate the block information. */
/* -------------------------------------------------------------------- */
for( i = 0; i < psTInfo->nBlocks; i++ )
{
psTInfo->panBlockOffset[i] = CPL_MSBWORD32(panIndex[i*2]) * 2;
psTInfo->panBlockSize[i] = CPL_MSBWORD32(panIndex[i*2+1]) * 2;
}
CPLFree( panIndex );
return( CE_None );
}
/************************************************************************/
/* AIGReadBounds() */
/* */
/* Read the dblbnd.adf file for the georeferenced bounds. */
/************************************************************************/
CPLErr AIGReadBounds( const char * pszCoverName, AIGInfo_t * psInfo )
{
char *pszHDRFilename;
VSILFILE *fp;
double adfBound[4];
/* -------------------------------------------------------------------- */
/* Open the file dblbnd.adf file. */
/* -------------------------------------------------------------------- */
pszHDRFilename = (char *) CPLMalloc(strlen(pszCoverName)+40);
sprintf( pszHDRFilename, "%s/dblbnd.adf", pszCoverName );
fp = AIGLLOpen( pszHDRFilename, "rb" );
if( fp == NULL )
{
CPLError( CE_Failure, CPLE_OpenFailed,
"Failed to open grid bounds file:\n%s\n",
pszHDRFilename );
CPLFree( pszHDRFilename );
return( CE_Failure );
}
CPLFree( pszHDRFilename );
/* -------------------------------------------------------------------- */
/* Get the contents - four doubles. */
/* -------------------------------------------------------------------- */
VSIFReadL( adfBound, 1, 32, fp );
VSIFCloseL( fp );
#ifdef CPL_LSB
CPL_SWAPDOUBLE(adfBound+0);
CPL_SWAPDOUBLE(adfBound+1);
CPL_SWAPDOUBLE(adfBound+2);
CPL_SWAPDOUBLE(adfBound+3);
#endif
psInfo->dfLLX = adfBound[0];
psInfo->dfLLY = adfBound[1];
psInfo->dfURX = adfBound[2];
psInfo->dfURY = adfBound[3];
return( CE_None );
}
/************************************************************************/
/* AIGReadStatistics() */
/* */
/* Read the sta.adf file for the layer statistics. */
/************************************************************************/
CPLErr AIGReadStatistics( const char * pszCoverName, AIGInfo_t * psInfo )
{
char *pszHDRFilename;
VSILFILE *fp;
double adfStats[4];
psInfo->dfMin = 0.0;
psInfo->dfMax = 0.0;
psInfo->dfMean = 0.0;
psInfo->dfStdDev = 0.0;
/* -------------------------------------------------------------------- */
/* Open the file sta.adf file. */
/* -------------------------------------------------------------------- */
pszHDRFilename = (char *) CPLMalloc(strlen(pszCoverName)+40);
sprintf( pszHDRFilename, "%s/sta.adf", pszCoverName );
fp = AIGLLOpen( pszHDRFilename, "rb" );
if( fp == NULL )
{
CPLError( CE_Failure, CPLE_OpenFailed,
"Failed to open grid statistics file:\n%s\n",
pszHDRFilename );
CPLFree( pszHDRFilename );
return( CE_Failure );
}
CPLFree( pszHDRFilename );
/* -------------------------------------------------------------------- */
/* Get the contents - four doubles. */
/* -------------------------------------------------------------------- */
VSIFReadL( adfStats, 1, 32, fp );
VSIFCloseL( fp );
#ifdef CPL_LSB
CPL_SWAPDOUBLE(adfStats+0);
CPL_SWAPDOUBLE(adfStats+1);
CPL_SWAPDOUBLE(adfStats+2);
CPL_SWAPDOUBLE(adfStats+3);
#endif
psInfo->dfMin = adfStats[0];
psInfo->dfMax = adfStats[1];
psInfo->dfMean = adfStats[2];
psInfo->dfStdDev = adfStats[3];
return( CE_None );
}