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/* LzHash.h -- HASH functions for LZ algorithms↩
2015-04-12 : Igor Pavlov : Public domain */↩
↩
#ifndef __LZ_HASH_H↩
#define __LZ_HASH_H↩
↩
#define kHash2Size (1 << 10)↩
#define kHash3Size (1 << 16)↩
#define kHash4Size (1 << 20)↩
↩
#define kFix3HashSize (kHash2Size)↩
#define kFix4HashSize (kHash2Size + kHash3Size)↩
#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)↩
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#define HASH2_CALC hv = cur[0] | ((UInt32)cur[1] << 8);↩
↩
#define HASH3_CALC { \↩
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \↩
h2 = temp & (kHash2Size - 1); \↩
hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }↩
↩
#define HASH4_CALC { \↩
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \↩
h2 = temp & (kHash2Size - 1); \↩
temp ^= ((UInt32)cur[2] << 8); \↩
h3 = temp & (kHash3Size - 1); \↩
hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; }↩
↩
#define HASH5_CALC { \↩
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \↩
h2 = temp & (kHash2Size - 1); \↩
temp ^= ((UInt32)cur[2] << 8); \↩
h3 = temp & (kHash3Size - 1); \↩
temp ^= (p->crc[cur[3]] << 5); \↩
h4 = temp & (kHash4Size - 1); \↩
hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; }↩
↩
/* #define HASH_ZIP_CALC hv = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */↩
#define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;↩
↩
↩
#define MT_HASH2_CALC \↩
h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);↩
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#define MT_HASH3_CALC { \↩
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \↩
h2 = temp & (kHash2Size - 1); \↩
h3 = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }↩
↩
#define MT_HASH4_CALC { \↩
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \↩
h2 = temp & (kHash2Size - 1); \↩
temp ^= ((UInt32)cur[2] << 8); \↩
h3 = temp & (kHash3Size - 1); \↩
h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }↩
↩
#endif↩