repo sync | baa3858 | 2013-07-26 17:53:31 -0700 | [diff] [blame] | 1 | /* LzHash.h -- HASH functions for LZ algorithms
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| 2 | 2009-02-07 : Igor Pavlov : Public domain */
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| 3 |
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| 4 | #ifndef __LZ_HASH_H
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| 5 | #define __LZ_HASH_H
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| 6 |
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| 7 | #define kHash2Size (1 << 10)
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| 8 | #define kHash3Size (1 << 16)
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| 9 | #define kHash4Size (1 << 20)
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| 10 |
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| 11 | #define kFix3HashSize (kHash2Size)
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| 12 | #define kFix4HashSize (kHash2Size + kHash3Size)
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| 13 | #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
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| 14 |
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| 15 | #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
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| 16 |
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| 17 | #define HASH3_CALC { \
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| 18 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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| 19 | hash2Value = temp & (kHash2Size - 1); \
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| 20 | hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
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| 21 |
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| 22 | #define HASH4_CALC { \
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| 23 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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| 24 | hash2Value = temp & (kHash2Size - 1); \
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| 25 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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| 26 | hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
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| 27 |
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| 28 | #define HASH5_CALC { \
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| 29 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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| 30 | hash2Value = temp & (kHash2Size - 1); \
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| 31 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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| 32 | hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
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| 33 | hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
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| 34 | hash4Value &= (kHash4Size - 1); }
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| 35 |
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| 36 | /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
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| 37 | #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
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| 38 |
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| 39 |
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| 40 | #define MT_HASH2_CALC \
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| 41 | hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
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| 42 |
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| 43 | #define MT_HASH3_CALC { \
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| 44 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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| 45 | hash2Value = temp & (kHash2Size - 1); \
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| 46 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
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| 47 |
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| 48 | #define MT_HASH4_CALC { \
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| 49 | UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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| 50 | hash2Value = temp & (kHash2Size - 1); \
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| 51 | hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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| 52 | hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
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| 53 |
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| 54 | #endif
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