goat3d

view libs/openctm/liblzma/LzHash.h @ 14:188c697b3b49

find changesets by author, revision, files, or words in the commit message
- added a document describing the goat3d file format chunk hierarchy - started an alternative XML-based file format - added the openctm library
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 26 Sep 2013 04:47:05 +0300
parents
children
line source
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