pcsx2/3rdparty/lzma/include/LzHash.h

35 lines
833 B
C

/* LzHash.h -- HASH functions for LZ algorithms
2019-10-30 : Igor Pavlov : Public domain */
#ifndef __LZ_HASH_H
#define __LZ_HASH_H
/*
(kHash2Size >= (1 << 8)) : Required
(kHash3Size >= (1 << 16)) : Required
*/
#define kHash2Size (1 << 10)
#define kHash3Size (1 << 16)
// #define kHash4Size (1 << 20)
#define kFix3HashSize (kHash2Size)
#define kFix4HashSize (kHash2Size + kHash3Size)
// #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
/*
We use up to 3 crc values for hash:
crc0
crc1 << Shift_1
crc2 << Shift_2
(Shift_1 = 5) and (Shift_2 = 10) is good tradeoff.
Small values for Shift are not good for collision rate.
Big value for Shift_2 increases the minimum size
of hash table, that will be slow for small files.
*/
#define kLzHash_CrcShift_1 5
#define kLzHash_CrcShift_2 10
#endif