1/* LzHash.h -- HASH functions for LZ algorithms 22009-02-07 : Igor Pavlov : Public domain 3in the public domain */ 4 5#ifndef __LZ_HASH_H 6#define __LZ_HASH_H 7 8#define kHash2Size (1 << 10) 9#define kHash3Size (1 << 16) 10#define kHash4Size (1 << 20) 11 12#define kFix3HashSize (kHash2Size) 13#define kFix4HashSize (kHash2Size + kHash3Size) 14#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 15 16#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); 17 18#define HASH3_CALC { \ 19 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 20 hash2Value = temp & (kHash2Size - 1); \ 21 hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } 22 23#define HASH4_CALC { \ 24 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 25 hash2Value = temp & (kHash2Size - 1); \ 26 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 27 hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } 28 29#define HASH5_CALC { \ 30 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 31 hash2Value = temp & (kHash2Size - 1); \ 32 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 33 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ 34 hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ 35 hash4Value &= (kHash4Size - 1); } 36 37/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ 38#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; 39 40 41#define MT_HASH2_CALC \ 42 hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); 43 44#define MT_HASH3_CALC { \ 45 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 46 hash2Value = temp & (kHash2Size - 1); \ 47 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } 48 49#define MT_HASH4_CALC { \ 50 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 51 hash2Value = temp & (kHash2Size - 1); \ 52 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 53 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } 54 55#endif 56