.dev

git-svn-id: svn://ultimatepp.org/upp/trunk@7818 f0d560ea-af0d-0410-9eb7-867de7ffcac7

uppdev/NibblePtr/lzf.cpp

@@ -0,0 +1,52 @@
+#include "Entropy.h"
+
+// Test/Test FooFoo
+
+String LZFCompress(const char *s, int length)
+{
+	String result;
+
+	const char *end = s + length;
+	
+	const char *hash_table[8192];
+	
+	for(int i = 0; i < 8192; i++)
+		hash_table[i] = s;
+	
+	char *lit = s;
+	int litlen = min(length, 4);
+	s += 4;
+	
+	for(;;) {
+		char *hptr;		
+		for(;;) {
+			hash = (2654435761U * Peek32le(s)) & 8191;
+			
+			hptr = hash_table[hash];
+			
+			if(s - hptr < 65536 && Peek32le(hash_table[hash]) == Peek32le(s))
+				break;
+			litlen++;
+			hash_table[(2654435761U * Peek32le(s - 3)) & 8191] = s - 3;
+			s++;
+			if(s >= end)
+				return;
+		}
+		
+		int matchlen = 4;
+		while(hptr + matchlen < s && s[matchlen] == hptr[matchlen])
+			matchlen++;
+		
+		LOGHEXDUMP(lit, litlen);
+		LOGHEXDUMP(hptr, matchlen);
+		
+		const char *e = s + matchlen;
+		while(s < e) {
+			hash_table[(2654435761U * Peek32le(s - 3)) & 8191] = s - 3;
+			s++;
+		}
+		
+		lit = s;
+		
+	}
+}