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  1. /* LzHash.h -- HASH functions for LZ algorithms
  2. 2008-10-04 : Igor Pavlov : Public domain */
  3.  
  4. #ifndef __LZHASH_H
  5. #define __LZHASH_H
  6.  
  7. #define kHash2Size (1 << 10)
  8. #define kHash3Size (1 << 16)
  9. #define kHash4Size (1 << 20)
  10.  
  11. #define kFix3HashSize (kHash2Size)
  12. #define kFix4HashSize (kHash2Size + kHash3Size)
  13. #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
  14.  
  15. #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
  16.  
  17. #define HASH3_CALC { \
  18.   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
  19.   hash2Value = temp & (kHash2Size - 1); \
  20.   hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
  21.  
  22. #define HASH4_CALC { \
  23.   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
  24.   hash2Value = temp & (kHash2Size - 1); \
  25.   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
  26.   hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
  27.  
  28. #define HASH5_CALC { \
  29.   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
  30.   hash2Value = temp & (kHash2Size - 1); \
  31.   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
  32.   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
  33.   hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
  34.   hash4Value &= (kHash4Size - 1); }
  35.  
  36. /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
  37. #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
  38.  
  39.  
  40. #define MT_HASH2_CALC \
  41.   hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
  42.  
  43. #define MT_HASH3_CALC { \
  44.   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
  45.   hash2Value = temp & (kHash2Size - 1); \
  46.   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
  47.  
  48. #define MT_HASH4_CALC { \
  49.   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
  50.   hash2Value = temp & (kHash2Size - 1); \
  51.   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
  52.   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
  53.  
  54. #endif
  55.