1 /* LzHash.h -- HASH functions for LZ algorithms 2 2015-04-12 : Igor Pavlov : Public domain */ 3 4 #ifndef __LZ_HASH_H 5 #define __LZ_HASH_H 6 7 #define kHash2Size (1 << 10) 8 #define kHash3Size (1 << 16) 9 #define kHash4Size (1 << 20) 10 11 #define kFix3HashSize (kHash2Size) 12 #define kFix4HashSize (kHash2Size + kHash3Size) 13 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 14 15 #define HASH2_CALC hv = cur[0] | ((UInt32)cur[1] << 8); 16 17 #define HASH3_CALC { \ 18 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 19 h2 = temp & (kHash2Size - 1); \ 20 hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } 21 22 #define HASH4_CALC { \ 23 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 24 h2 = temp & (kHash2Size - 1); \ 25 temp ^= ((UInt32)cur[2] << 8); \ 26 h3 = temp & (kHash3Size - 1); \ 27 hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; } 28 29 #define HASH5_CALC { \ 30 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 31 h2 = temp & (kHash2Size - 1); \ 32 temp ^= ((UInt32)cur[2] << 8); \ 33 h3 = temp & (kHash3Size - 1); \ 34 temp ^= (p->crc[cur[3]] << 5); \ 35 h4 = temp & (kHash4Size - 1); \ 36 hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; } 37 38 /* #define HASH_ZIP_CALC hv = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ 39 #define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; 40 41 42 #define MT_HASH2_CALC \ 43 h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); 44 45 #define MT_HASH3_CALC { \ 46 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 47 h2 = temp & (kHash2Size - 1); \ 48 h3 = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } 49 50 #define MT_HASH4_CALC { \ 51 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 52 h2 = temp & (kHash2Size - 1); \ 53 temp ^= ((UInt32)cur[2] << 8); \ 54 h3 = temp & (kHash3Size - 1); \ 55 h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } 56 57 #endif 58
