b24e7fce |
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 |