mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-25 17:10:12 +00:00
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* LzHash.h -- HASH functions for LZ algorithms
|
|
2015-04-12 : Igor Pavlov : Public domain */
|
|
|
|
#ifndef __LZ_HASH_H
|
|
#define __LZ_HASH_H
|
|
|
|
#define kHash2Size (1 << 10)
|
|
#define kHash3Size (1 << 16)
|
|
#define kHash4Size (1 << 20)
|
|
|
|
#define kFix3HashSize (kHash2Size)
|
|
#define kFix4HashSize (kHash2Size + kHash3Size)
|
|
#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
|
|
|
|
#define HASH2_CALC hv = cur[0] | ((uint32_t)cur[1] << 8);
|
|
|
|
#define HASH3_CALC { \
|
|
uint32_t temp = p->crc[cur[0]] ^ cur[1]; \
|
|
h2 = temp & (kHash2Size - 1); \
|
|
hv = (temp ^ ((uint32_t)cur[2] << 8)) & p->hashMask; }
|
|
|
|
#define HASH4_CALC { \
|
|
uint32_t temp = p->crc[cur[0]] ^ cur[1]; \
|
|
h2 = temp & (kHash2Size - 1); \
|
|
temp ^= ((uint32_t)cur[2] << 8); \
|
|
h3 = temp & (kHash3Size - 1); \
|
|
hv = (temp ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
|
|
|
|
#define HASH5_CALC { \
|
|
uint32_t temp = p->crc[cur[0]] ^ cur[1]; \
|
|
h2 = temp & (kHash2Size - 1); \
|
|
temp ^= ((uint32_t)cur[2] << 8); \
|
|
h3 = temp & (kHash3Size - 1); \
|
|
temp ^= (p->crc[cur[3]] << 5); \
|
|
h4 = temp & (kHash4Size - 1); \
|
|
hv = (temp ^ (p->crc[cur[4]] << 3)) & p->hashMask; }
|
|
|
|
#define HASH_ZIP_CALC hv = ((cur[2] | ((uint32_t)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
|
|
|
|
|
|
#define MT_HASH2_CALC \
|
|
h2 = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
|
|
|
|
#define MT_HASH3_CALC { \
|
|
uint32_t temp = p->crc[cur[0]] ^ cur[1]; \
|
|
h2 = temp & (kHash2Size - 1); \
|
|
h3 = (temp ^ ((uint32_t)cur[2] << 8)) & (kHash3Size - 1); }
|
|
|
|
#define MT_HASH4_CALC { \
|
|
uint32_t temp = p->crc[cur[0]] ^ cur[1]; \
|
|
h2 = temp & (kHash2Size - 1); \
|
|
temp ^= ((uint32_t)cur[2] << 8); \
|
|
h3 = temp & (kHash3Size - 1); \
|
|
h4 = (temp ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
|
|
|
|
#endif
|