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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* LzHash.h -- HASH functions for LZ algorithms
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2015-04-12 : 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 hv = 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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h2 = temp & (kHash2Size - 1); \
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hv = (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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h2 = temp & (kHash2Size - 1); \
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temp ^= ((UInt32)cur[2] << 8); \
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h3 = temp & (kHash3Size - 1); \
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hv = (temp ^ (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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h2 = temp & (kHash2Size - 1); \
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temp ^= ((UInt32)cur[2] << 8); \
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h3 = temp & (kHash3Size - 1); \
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temp ^= (p->crc[cur[3]] << 5); \
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h4 = temp & (kHash4Size - 1); \
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hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; }
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/* #define HASH_ZIP_CALC hv = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
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#define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
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#define MT_HASH2_CALC \
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h2 = (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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h2 = temp & (kHash2Size - 1); \
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h3 = (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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h2 = temp & (kHash2Size - 1); \
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temp ^= ((UInt32)cur[2] << 8); \
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h3 = temp & (kHash3Size - 1); \
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h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
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#endif
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