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1 /* LzHash.h -- HASH functions for LZ algorithms | 1 /* LzHash.h -- HASH functions for LZ algorithms |
2 2009-02-07 : Igor Pavlov : Public domain */ | 2 2015-04-12 : Igor Pavlov : Public domain */ |
3 | 3 |
4 #ifndef __LZ_HASH_H | 4 #ifndef __LZ_HASH_H |
5 #define __LZ_HASH_H | 5 #define __LZ_HASH_H |
6 | 6 |
7 #define kHash2Size (1 << 10) | 7 #define kHash2Size (1 << 10) |
8 #define kHash3Size (1 << 16) | 8 #define kHash3Size (1 << 16) |
9 #define kHash4Size (1 << 20) | 9 #define kHash4Size (1 << 20) |
10 | 10 |
11 #define kFix3HashSize (kHash2Size) | 11 #define kFix3HashSize (kHash2Size) |
12 #define kFix4HashSize (kHash2Size + kHash3Size) | 12 #define kFix4HashSize (kHash2Size + kHash3Size) |
13 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) | 13 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) |
14 | 14 |
15 #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); | 15 #define HASH2_CALC hv = cur[0] | ((UInt32)cur[1] << 8); |
16 | 16 |
17 #define HASH3_CALC { \ | 17 #define HASH3_CALC { \ |
18 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ | 18 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
19 hash2Value = temp & (kHash2Size - 1); \ | 19 h2 = temp & (kHash2Size - 1); \ |
20 hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } | 20 hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } |
21 | 21 |
22 #define HASH4_CALC { \ | 22 #define HASH4_CALC { \ |
23 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ | 23 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
24 hash2Value = temp & (kHash2Size - 1); \ | 24 h2 = temp & (kHash2Size - 1); \ |
25 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ | 25 temp ^= ((UInt32)cur[2] << 8); \ |
26 hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMa
sk; } | 26 h3 = temp & (kHash3Size - 1); \ |
| 27 hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; } |
27 | 28 |
28 #define HASH5_CALC { \ | 29 #define HASH5_CALC { \ |
29 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ | 30 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
30 hash2Value = temp & (kHash2Size - 1); \ | 31 h2 = temp & (kHash2Size - 1); \ |
31 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ | 32 temp ^= ((UInt32)cur[2] << 8); \ |
32 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ | 33 h3 = temp & (kHash3Size - 1); \ |
33 hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ | 34 temp ^= (p->crc[cur[3]] << 5); \ |
34 hash4Value &= (kHash4Size - 1); } | 35 h4 = temp & (kHash4Size - 1); \ |
| 36 hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; } |
35 | 37 |
36 /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[
cur[2]]) & 0xFFFF; */ | 38 /* #define HASH_ZIP_CALC hv = ((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; | 39 #define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) &
0xFFFF; |
38 | 40 |
39 | 41 |
40 #define MT_HASH2_CALC \ | 42 #define MT_HASH2_CALC \ |
41 hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); | 43 h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); |
42 | 44 |
43 #define MT_HASH3_CALC { \ | 45 #define MT_HASH3_CALC { \ |
44 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ | 46 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
45 hash2Value = temp & (kHash2Size - 1); \ | 47 h2 = temp & (kHash2Size - 1); \ |
46 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } | 48 h3 = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } |
47 | 49 |
48 #define MT_HASH4_CALC { \ | 50 #define MT_HASH4_CALC { \ |
49 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ | 51 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
50 hash2Value = temp & (kHash2Size - 1); \ | 52 h2 = temp & (kHash2Size - 1); \ |
51 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ | 53 temp ^= ((UInt32)cur[2] << 8); \ |
52 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4S
ize - 1); } | 54 h3 = temp & (kHash3Size - 1); \ |
| 55 h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } |
53 | 56 |
54 #endif | 57 #endif |
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