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54 lines
1.9 KiB
54 lines
1.9 KiB
/* LzHash.h -- HASH functions for LZ algorithms |
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2009-02-07 : Igor Pavlov : Public domain */ |
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#ifndef __LZ_HASH_H |
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#define __LZ_HASH_H |
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#define kHash2Size (1 << 10) |
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#define kHash3Size (1 << 16) |
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#define kHash4Size (1 << 20) |
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#define kFix3HashSize (kHash2Size) |
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#define kFix4HashSize (kHash2Size + kHash3Size) |
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#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) |
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#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); |
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#define HASH3_CALC { \ |
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UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
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hash2Value = temp & (kHash2Size - 1); \ |
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hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } |
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#define HASH4_CALC { \ |
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UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
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hash2Value = temp & (kHash2Size - 1); \ |
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hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
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hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } |
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#define HASH5_CALC { \ |
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UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
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hash2Value = temp & (kHash2Size - 1); \ |
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hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
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hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ |
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hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ |
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hash4Value &= (kHash4Size - 1); } |
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/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ |
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#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; |
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#define MT_HASH2_CALC \ |
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hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); |
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#define MT_HASH3_CALC { \ |
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UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
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hash2Value = temp & (kHash2Size - 1); \ |
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hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } |
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#define MT_HASH4_CALC { \ |
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UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ |
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hash2Value = temp & (kHash2Size - 1); \ |
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hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ |
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hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } |
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#endif
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