15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* LzHash.h -- HASH functions for LZ algorithms 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)2009-02-07 : Igor Pavlov : Public domain */ 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef __LZ_HASH_H 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define __LZ_HASH_H 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kHash2Size (1 << 10) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kHash3Size (1 << 16) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kHash4Size (1 << 20) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kFix3HashSize (kHash2Size) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kFix4HashSize (kHash2Size + kHash3Size) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HASH3_CALC { \ 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = temp & (kHash2Size - 1); \ 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HASH4_CALC { \ 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = temp & (kHash2Size - 1); \ 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HASH5_CALC { \ 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = temp & (kHash2Size - 1); \ 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash4Value &= (kHash4Size - 1); } 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MT_HASH2_CALC \ 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MT_HASH3_CALC { \ 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = temp & (kHash2Size - 1); \ 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MT_HASH4_CALC { \ 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash2Value = temp & (kHash2Size - 1); \ 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 55