1
/* LzHash.h -- HASH functions for LZ algorithms
2
2009-02-07 : Igor Pavlov : Public domain */
7
#define kHash2Size (1 << 10)
8
#define kHash3Size (1 << 16)
9
#define kHash4Size (1 << 20)
11
#define kFix3HashSize (kHash2Size)
12
#define kFix4HashSize (kHash2Size + kHash3Size)
13
#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
15
#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
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; }
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; }
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); }
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;
40
#define MT_HASH2_CALC \
41
hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
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); }
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); }