1baa3858d3f5d128a5c8466b700098109edcad5f2repo sync/* LzHash.h -- HASH functions for LZ algorithms
2baa3858d3f5d128a5c8466b700098109edcad5f2repo sync2009-02-07 : Igor Pavlov : Public domain */
3baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
4baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#ifndef __LZ_HASH_H
5baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define __LZ_HASH_H
6baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
7baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash2Size (1 << 10)
8baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash3Size (1 << 16)
9baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kHash4Size (1 << 20)
10baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
11baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix3HashSize (kHash2Size)
12baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix4HashSize (kHash2Size + kHash3Size)
13baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
14baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
15baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
16baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
17baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH3_CALC { \
18baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
19baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = temp & (kHash2Size - 1); \
20baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
21baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
22baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH4_CALC { \
23baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
24baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = temp & (kHash2Size - 1); \
25baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
26baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
27baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
28baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH5_CALC { \
29baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
30baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = temp & (kHash2Size - 1); \
31baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
32baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
33baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
34baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash4Value &= (kHash4Size - 1); }
35baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
36baa3858d3f5d128a5c8466b700098109edcad5f2repo sync/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
37baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
38baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
39baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
40baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH2_CALC \
41baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
42baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
43baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH3_CALC { \
44baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
45baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = temp & (kHash2Size - 1); \
46baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
47baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
48baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#define MT_HASH4_CALC { \
49baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
50baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash2Value = temp & (kHash2Size - 1); \
51baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
52baa3858d3f5d128a5c8466b700098109edcad5f2repo sync  hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
53baa3858d3f5d128a5c8466b700098109edcad5f2repo sync
54baa3858d3f5d128a5c8466b700098109edcad5f2repo sync#endif
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