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30fdf114 LG |
1 | /* LzHash.h -- HASH functions for LZ algorithms\r |
2 | 2008-10-04 : Igor Pavlov : Public domain */\r | |
3 | \r | |
4 | #ifndef __LZHASH_H\r | |
5 | #define __LZHASH_H\r | |
6 | \r | |
7 | #define kHash2Size (1 << 10)\r | |
8 | #define kHash3Size (1 << 16)\r | |
9 | #define kHash4Size (1 << 20)\r | |
10 | \r | |
11 | #define kFix3HashSize (kHash2Size)\r | |
12 | #define kFix4HashSize (kHash2Size + kHash3Size)\r | |
13 | #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)\r | |
14 | \r | |
15 | #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);\r | |
16 | \r | |
17 | #define HASH3_CALC { \\r | |
18 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r | |
19 | hash2Value = temp & (kHash2Size - 1); \\r | |
20 | hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }\r | |
21 | \r | |
22 | #define HASH4_CALC { \\r | |
23 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r | |
24 | hash2Value = temp & (kHash2Size - 1); \\r | |
25 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \\r | |
26 | hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }\r | |
27 | \r | |
28 | #define HASH5_CALC { \\r | |
29 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r | |
30 | hash2Value = temp & (kHash2Size - 1); \\r | |
31 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \\r | |
32 | hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \\r | |
33 | hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \\r | |
34 | hash4Value &= (kHash4Size - 1); }\r | |
35 | \r | |
36 | /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */\r | |
37 | #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;\r | |
38 | \r | |
39 | \r | |
40 | #define MT_HASH2_CALC \\r | |
41 | hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);\r | |
42 | \r | |
43 | #define MT_HASH3_CALC { \\r | |
44 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r | |
45 | hash2Value = temp & (kHash2Size - 1); \\r | |
46 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }\r | |
47 | \r | |
48 | #define MT_HASH4_CALC { \\r | |
49 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r | |
50 | hash2Value = temp & (kHash2Size - 1); \\r | |
51 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \\r | |
52 | hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }\r | |
53 | \r | |
54 | #endif\r |