1 /* LzHash.h */

     2 

     3 #ifndef __C_LZHASH_H

     4 #define __C_LZHASH_H

     5 

     6 #define kHash2Size (1 << 10)

     7 #define kHash3Size (1 << 16)

     8 #define kHash4Size (1 << 20)

     9 

    10 #define kFix3HashSize (kHash2Size)

    11 #define kFix4HashSize (kHash2Size + kHash3Size)

    12 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)

    13 

    14 #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);

    15 

    16 #define HASH3_CALC { \

    17   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \

    18   hash2Value = temp & (kHash2Size - 1); \

    19   hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }

    20 

    21 #define HASH4_CALC { \

    22   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \

    23   hash2Value = temp & (kHash2Size - 1); \

    24   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \

    25   hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & p->hashMask; }

    26 

    27 #define HASH5_CALC { \

    28   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \

    29   hash2Value = temp & (kHash2Size - 1); \

    30   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \

    31   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)); \

    32   hashValue = (hash4Value ^ (g_CrcTable[cur[4]] << 3)) & p->hashMask; \

    33   hash4Value &= (kHash4Size - 1); }

    34 

    35 /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ g_CrcTable[cur[2]]) & 0xFFFF; */

    36 #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ g_CrcTable[cur[1]]) & 0xFFFF;

    37 

    38 

    39 #define MT_HASH2_CALC \

    40   hash2Value = (g_CrcTable[cur[0]] ^ cur[1]) & (kHash2Size - 1);

    41 

    42 #define MT_HASH3_CALC { \

    43   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \

    44   hash2Value = temp & (kHash2Size - 1); \

    45   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }

    46 

    47 #define MT_HASH4_CALC { \

    48   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \

    49   hash2Value = temp & (kHash2Size - 1); \

    50   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \

    51   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & (kHash4Size - 1); }

    52 

    53 #endif