1/* LzHash.h -- HASH functions for LZ algorithms
 22015-04-12 : Igor Pavlov : Public domain */
 3
 4#ifndef __LZ_HASH_H
 5#define __LZ_HASH_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 hv = cur[0] | ((UInt32)cur[1] << 8);
16
17#define HASH3_CALC { \
18  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
19  h2 = temp & (kHash2Size - 1); \
20  hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
21
22#define HASH4_CALC { \
23  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
24  h2 = temp & (kHash2Size - 1); \
25  temp ^= ((UInt32)cur[2] << 8); \
26  h3 = temp & (kHash3Size - 1); \
27  hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
28
29#define HASH5_CALC { \
30  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
31  h2 = temp & (kHash2Size - 1); \
32  temp ^= ((UInt32)cur[2] << 8); \
33  h3 = temp & (kHash3Size - 1); \
34  temp ^= (p->crc[cur[3]] << 5); \
35  h4 = temp & (kHash4Size - 1); \
36  hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; }
37
38/* #define HASH_ZIP_CALC hv = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
39#define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
40
41
42#define MT_HASH2_CALC \
43  h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
44
45#define MT_HASH3_CALC { \
46  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
47  h2 = temp & (kHash2Size - 1); \
48  h3 = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
49
50#define MT_HASH4_CALC { \
51  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
52  h2 = temp & (kHash2Size - 1); \
53  temp ^= ((UInt32)cur[2] << 8); \
54  h3 = temp & (kHash3Size - 1); \
55  h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
56
57#endif