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- /* LzHash.h -- HASH constants for LZ algorithms
- 2023-03-05 : Igor Pavlov : Public domain */
- #ifndef ZIP7_INC_LZ_HASH_H
- #define ZIP7_INC_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
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