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1 /* LzHash.h -- HASH functions for LZ algorithms
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2 2008-10-04 : Igor Pavlov : Public domain */
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3
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4 #ifndef __LZHASH_H
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5 #define __LZHASH_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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