1baa3858d3f5d128a5c8466b700098109edcad5f2repo sync/* LzHash.h -- HASH functions for LZ algorithms 2baa3858d3f5d128a5c8466b700098109edcad5f2repo sync2009-02-07 : Igor Pavlov : Public domain */ 3baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 4baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#ifndef __LZ_HASH_H 5baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define __LZ_HASH_H 6baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 7baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash2Size (1 << 10) 8baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash3Size (1 << 16) 9baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash4Size (1 << 20) 10baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 11baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix3HashSize (kHash2Size) 12baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix4HashSize (kHash2Size + kHash3Size) 13baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 14baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 15baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); 16baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 17baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH3_CALC { \ 18baa3858d3f5d128a5c8466b700098109edcad5f2repo sync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 19baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = temp & (kHash2Size - 1); \ 20baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } 21baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 22baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH4_CALC { \ 23baa3858d3f5d128a5c8466b700098109edcad5f2repo sync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 24baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = temp & (kHash2Size - 1); \ 25baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 26baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } 27baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 28baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH5_CALC { \ 29baa3858d3f5d128a5c8466b700098109edcad5f2repo sync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 30baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = temp & (kHash2Size - 1); \ 31baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 32baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ 33baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ 34baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash4Value &= (kHash4Size - 1); } 35baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 36baa3858d3f5d128a5c8466b700098109edcad5f2repo sync/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ 37baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; 38baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 39baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 40baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH2_CALC \ 41baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); 42baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 43baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH3_CALC { \ 44baa3858d3f5d128a5c8466b700098109edcad5f2repo sync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 45baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = temp & (kHash2Size - 1); \ 46baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } 47baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 48baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH4_CALC { \ 49baa3858d3f5d128a5c8466b700098109edcad5f2repo sync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 50baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash2Value = temp & (kHash2Size - 1); \ 51baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 52baa3858d3f5d128a5c8466b700098109edcad5f2repo sync hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } 53baa3858d3f5d128a5c8466b700098109edcad5f2repo sync 54baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#endif 55