Mercurial > vba-linux

     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
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:48:33 -0600
parents	f9f4f1b99eed
children