OLD | NEW |
(Empty) | |
| 1 /* LzHash.h -- HASH functions for LZ algorithms |
| 2 2009-02-07 : 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 hashValue = cur[0] | ((UInt32)cur[1] << 8); |
| 16 |
| 17 #define HASH3_CALC { \ |
| 18 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
| 19 hash2Value = temp & (kHash2Size - 1); \ |
| 20 hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } |
| 21 |
| 22 #define HASH4_CALC { \ |
| 23 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
| 24 hash2Value = temp & (kHash2Size - 1); \ |
| 25 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
| 26 hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMa
sk; } |
| 27 |
| 28 #define HASH5_CALC { \ |
| 29 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
| 30 hash2Value = temp & (kHash2Size - 1); \ |
| 31 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
| 32 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ |
| 33 hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ |
| 34 hash4Value &= (kHash4Size - 1); } |
| 35 |
| 36 /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[
cur[2]]) & 0xFFFF; */ |
| 37 #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur
[1]]) & 0xFFFF; |
| 38 |
| 39 |
| 40 #define MT_HASH2_CALC \ |
| 41 hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); |
| 42 |
| 43 #define MT_HASH3_CALC { \ |
| 44 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
| 45 hash2Value = temp & (kHash2Size - 1); \ |
| 46 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } |
| 47 |
| 48 #define MT_HASH4_CALC { \ |
| 49 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
| 50 hash2Value = temp & (kHash2Size - 1); \ |
| 51 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
| 52 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4S
ize - 1); } |
| 53 |
| 54 #endif |
OLD | NEW |