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Diffstat (limited to 'C/Compress/Lz/LzHash.h')
-rwxr-xr-x | C/Compress/Lz/LzHash.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/C/Compress/Lz/LzHash.h b/C/Compress/Lz/LzHash.h new file mode 100755 index 00000000..87c28365 --- /dev/null +++ b/C/Compress/Lz/LzHash.h @@ -0,0 +1,53 @@ +/* LzHash.h */ + +#ifndef __C_LZHASH_H +#define __C_LZHASH_H + +#define kHash2Size (1 << 10) +#define kHash3Size (1 << 16) +#define kHash4Size (1 << 20) + +#define kFix3HashSize (kHash2Size) +#define kFix4HashSize (kHash2Size + kHash3Size) +#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) + +#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); + +#define HASH3_CALC { \ + UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } + +#define HASH4_CALC { \ + UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & p->hashMask; } + +#define HASH5_CALC { \ + UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)); \ + hashValue = (hash4Value ^ (g_CrcTable[cur[4]] << 3)) & p->hashMask; \ + hash4Value &= (kHash4Size - 1); } + +/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ g_CrcTable[cur[2]]) & 0xFFFF; */ +#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ g_CrcTable[cur[1]]) & 0xFFFF; + + +#define MT_HASH2_CALC \ + hash2Value = (g_CrcTable[cur[0]] ^ cur[1]) & (kHash2Size - 1); + +#define MT_HASH3_CALC { \ + UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } + +#define MT_HASH4_CALC { \ + UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & (kHash4Size - 1); } + +#endif |