1/* LzHash.h -- HASH constants for LZ algorithms 22023-03-05 : Igor Pavlov : Public domain */ 3 4#ifndef ZIP7_INC_LZ_HASH_H 5#define ZIP7_INC_LZ_HASH_H 6 7/* 8 (kHash2Size >= (1 << 8)) : Required 9 (kHash3Size >= (1 << 16)) : Required 10*/ 11 12#define kHash2Size (1 << 10) 13#define kHash3Size (1 << 16) 14// #define kHash4Size (1 << 20) 15 16#define kFix3HashSize (kHash2Size) 17#define kFix4HashSize (kHash2Size + kHash3Size) 18// #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 19 20/* 21 We use up to 3 crc values for hash: 22 crc0 23 crc1 << Shift_1 24 crc2 << Shift_2 25 (Shift_1 = 5) and (Shift_2 = 10) is good tradeoff. 26 Small values for Shift are not good for collision rate. 27 Big value for Shift_2 increases the minimum size 28 of hash table, that will be slow for small files. 29*/ 30 31#define kLzHash_CrcShift_1 5 32#define kLzHash_CrcShift_2 10 33 34#endif 35