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11ff2c71 1/* LzHash.h -- HASH functions for LZ algorithms\r
1e230224 22015-04-12 : Igor Pavlov : Public domain */\r
11ff2c71 3\r
1e230224
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4#ifndef __LZ_HASH_H\r
5#define __LZ_HASH_H\r
11ff2c71 6\r
1436aea4
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7#define kHash2Size (1 << 10)\r
8#define kHash3Size (1 << 16)\r
9#define kHash4Size (1 << 20)\r
11ff2c71 10\r
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11#define kFix3HashSize (kHash2Size)\r
12#define kFix4HashSize (kHash2Size + kHash3Size)\r
13#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)\r
11ff2c71 14\r
1436aea4 15#define HASH2_CALC hv = cur[0] | ((UInt32)cur[1] << 8);\r
11ff2c71 16\r
1436aea4 17#define HASH3_CALC {\\r
11ff2c71 18 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r
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19 h2 = temp & (kHash2Size - 1); \\r
20 hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }\r
11ff2c71 21\r
1436aea4 22#define HASH4_CALC {\\r
11ff2c71 23 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r
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24 h2 = temp & (kHash2Size - 1); \\r
25 temp ^= ((UInt32)cur[2] << 8); \\r
26 h3 = temp & (kHash3Size - 1); \\r
27 hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; }\r
11ff2c71 28\r
1436aea4 29#define HASH5_CALC {\\r
11ff2c71 30 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r
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31 h2 = temp & (kHash2Size - 1); \\r
32 temp ^= ((UInt32)cur[2] << 8); \\r
33 h3 = temp & (kHash3Size - 1); \\r
34 temp ^= (p->crc[cur[3]] << 5); \\r
35 h4 = temp & (kHash4Size - 1); \\r
36 hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; }\r
11ff2c71 37\r
1e230224 38/* #define HASH_ZIP_CALC hv = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */\r
1436aea4 39#define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;\r
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40\r
41#define MT_HASH2_CALC \\r
1e230224 42 h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);\r
11ff2c71 43\r
1436aea4 44#define MT_HASH3_CALC {\\r
11ff2c71 45 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r
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46 h2 = temp & (kHash2Size - 1); \\r
47 h3 = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }\r
11ff2c71 48\r
1436aea4 49#define MT_HASH4_CALC {\\r
11ff2c71 50 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \\r
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51 h2 = temp & (kHash2Size - 1); \\r
52 temp ^= ((UInt32)cur[2] << 8); \\r
53 h3 = temp & (kHash3Size - 1); \\r
54 h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }\r
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55\r
56#endif\r