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| | | /* LzHash.h -- HASH constants for LZ algorithms |
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| | | 2023-03-05 : Igor Pavlov : Public domain */ |
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| | | #ifndef ZIP7_INC_LZ_HASH_H |
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| | | #define ZIP7_INC_LZ_HASH_H |
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| | | |
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| | | /* |
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| | | (kHash2Size >= (1 << 8)) : Required |
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| | | (kHash3Size >= (1 << 16)) : Required |
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| | | */ |
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| | | |
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| | | #define kHash2Size (1 << 10) |
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| | | #define kHash3Size (1 << 16) |
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| | | // #define kHash4Size (1 << 20) |
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| | | |
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| | | #define kFix3HashSize (kHash2Size) |
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| | | #define kFix4HashSize (kHash2Size + kHash3Size) |
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| | | // #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) |
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| | | |
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| | | /* |
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| | | We use up to 3 crc values for hash: |
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| | | crc0 |
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| | | crc1 << Shift_1 |
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| | | crc2 << Shift_2 |
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| | | (Shift_1 = 5) and (Shift_2 = 10) is good tradeoff. |
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| | | Small values for Shift are not good for collision rate. |
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| | | Big value for Shift_2 increases the minimum size |
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| | | of hash table, that will be slow for small files. |
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| | | */ |
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| | | |
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| | | #define kLzHash_CrcShift_1 5 |
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| | | #define kLzHash_CrcShift_2 10 |
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| | | |
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| | | #endif |
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