rlm@1: /* LzHash.h -- HASH functions for LZ algorithms
rlm@1: 2008-10-04 : Igor Pavlov : Public domain */
rlm@1: 
rlm@1: #ifndef __LZHASH_H
rlm@1: #define __LZHASH_H
rlm@1: 
rlm@1: #define kHash2Size (1 << 10)
rlm@1: #define kHash3Size (1 << 16)
rlm@1: #define kHash4Size (1 << 20)
rlm@1: 
rlm@1: #define kFix3HashSize (kHash2Size)
rlm@1: #define kFix4HashSize (kHash2Size + kHash3Size)
rlm@1: #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
rlm@1: 
rlm@1: #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
rlm@1: 
rlm@1: #define HASH3_CALC { \
rlm@1:   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
rlm@1:   hash2Value = temp & (kHash2Size - 1); \
rlm@1:   hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
rlm@1: 
rlm@1: #define HASH4_CALC { \
rlm@1:   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
rlm@1:   hash2Value = temp & (kHash2Size - 1); \
rlm@1:   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
rlm@1:   hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
rlm@1: 
rlm@1: #define HASH5_CALC { \
rlm@1:   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
rlm@1:   hash2Value = temp & (kHash2Size - 1); \
rlm@1:   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
rlm@1:   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
rlm@1:   hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
rlm@1:   hash4Value &= (kHash4Size - 1); }
rlm@1: 
rlm@1: /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
rlm@1: #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
rlm@1: 
rlm@1: 
rlm@1: #define MT_HASH2_CALC \
rlm@1:   hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
rlm@1: 
rlm@1: #define MT_HASH3_CALC { \
rlm@1:   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
rlm@1:   hash2Value = temp & (kHash2Size - 1); \
rlm@1:   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
rlm@1: 
rlm@1: #define MT_HASH4_CALC { \
rlm@1:   UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
rlm@1:   hash2Value = temp & (kHash2Size - 1); \
rlm@1:   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
rlm@1:   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
rlm@1: 
rlm@1: #endif