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| 1 /////////////////////////////////////////////////////////////////////////////// |
| 2 // |
| 3 /// \file lz_encoder_hash.h |
| 4 /// \brief Hash macros for match finders |
| 5 // |
| 6 // Author: Igor Pavlov |
| 7 // |
| 8 // This file has been put into the public domain. |
| 9 // You can do whatever you want with this file. |
| 10 // |
| 11 /////////////////////////////////////////////////////////////////////////////// |
| 12 |
| 13 #ifndef LZMA_LZ_ENCODER_HASH_H |
| 14 #define LZMA_LZ_ENCODER_HASH_H |
| 15 |
| 16 #if defined(WORDS_BIGENDIAN) && !defined(HAVE_SMALL) |
| 17 // This is to make liblzma produce the same output on big endian |
| 18 // systems that it does on little endian systems. lz_encoder.c |
| 19 // takes care of including the actual table. |
| 20 extern const uint32_t lzma_lz_hash_table[256]; |
| 21 # define hash_table lzma_lz_hash_table |
| 22 #else |
| 23 # include "check.h" |
| 24 # define hash_table lzma_crc32_table[0] |
| 25 #endif |
| 26 |
| 27 #define HASH_2_SIZE (UINT32_C(1) << 10) |
| 28 #define HASH_3_SIZE (UINT32_C(1) << 16) |
| 29 #define HASH_4_SIZE (UINT32_C(1) << 20) |
| 30 |
| 31 #define HASH_2_MASK (HASH_2_SIZE - 1) |
| 32 #define HASH_3_MASK (HASH_3_SIZE - 1) |
| 33 #define HASH_4_MASK (HASH_4_SIZE - 1) |
| 34 |
| 35 #define FIX_3_HASH_SIZE (HASH_2_SIZE) |
| 36 #define FIX_4_HASH_SIZE (HASH_2_SIZE + HASH_3_SIZE) |
| 37 #define FIX_5_HASH_SIZE (HASH_2_SIZE + HASH_3_SIZE + HASH_4_SIZE) |
| 38 |
| 39 // Endianness doesn't matter in hash_2_calc() (no effect on the output). |
| 40 #ifdef TUKLIB_FAST_UNALIGNED_ACCESS |
| 41 # define hash_2_calc() \ |
| 42 const uint32_t hash_value = *(const uint16_t *)(cur); |
| 43 #else |
| 44 # define hash_2_calc() \ |
| 45 const uint32_t hash_value \ |
| 46 = (uint32_t)(cur[0]) | ((uint32_t)(cur[1]) << 8) |
| 47 #endif |
| 48 |
| 49 #define hash_3_calc() \ |
| 50 const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \ |
| 51 const uint32_t hash_2_value = temp & HASH_2_MASK; \ |
| 52 const uint32_t hash_value \ |
| 53 = (temp ^ ((uint32_t)(cur[2]) << 8)) & mf->hash_mask |
| 54 |
| 55 #define hash_4_calc() \ |
| 56 const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \ |
| 57 const uint32_t hash_2_value = temp & HASH_2_MASK; \ |
| 58 const uint32_t hash_3_value \ |
| 59 = (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \ |
| 60 const uint32_t hash_value = (temp ^ ((uint32_t)(cur[2]) << 8) \ |
| 61 ^ (hash_table[cur[3]] << 5)) & mf->hash_mask |
| 62 |
| 63 |
| 64 // The following are not currently used. |
| 65 |
| 66 #define hash_5_calc() \ |
| 67 const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \ |
| 68 const uint32_t hash_2_value = temp & HASH_2_MASK; \ |
| 69 const uint32_t hash_3_value \ |
| 70 = (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \ |
| 71 uint32_t hash_4_value = (temp ^ ((uint32_t)(cur[2]) << 8) ^ \ |
| 72 ^ hash_table[cur[3]] << 5); \ |
| 73 const uint32_t hash_value \ |
| 74 = (hash_4_value ^ (hash_table[cur[4]] << 3)) \ |
| 75 & mf->hash_mask; \ |
| 76 hash_4_value &= HASH_4_MASK |
| 77 |
| 78 /* |
| 79 #define hash_zip_calc() \ |
| 80 const uint32_t hash_value \ |
| 81 = (((uint32_t)(cur[0]) | ((uint32_t)(cur[1]) << 8)) \ |
| 82 ^ hash_table[cur[2]]) & 0xFFFF |
| 83 */ |
| 84 |
| 85 #define hash_zip_calc() \ |
| 86 const uint32_t hash_value \ |
| 87 = (((uint32_t)(cur[2]) | ((uint32_t)(cur[0]) << 8)) \ |
| 88 ^ hash_table[cur[1]]) & 0xFFFF |
| 89 |
| 90 #define mt_hash_2_calc() \ |
| 91 const uint32_t hash_2_value \ |
| 92 = (hash_table[cur[0]] ^ cur[1]) & HASH_2_MASK |
| 93 |
| 94 #define mt_hash_3_calc() \ |
| 95 const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \ |
| 96 const uint32_t hash_2_value = temp & HASH_2_MASK; \ |
| 97 const uint32_t hash_3_value \ |
| 98 = (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK |
| 99 |
| 100 #define mt_hash_4_calc() \ |
| 101 const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \ |
| 102 const uint32_t hash_2_value = temp & HASH_2_MASK; \ |
| 103 const uint32_t hash_3_value \ |
| 104 = (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \ |
| 105 const uint32_t hash_4_value = (temp ^ ((uint32_t)(cur[2]) << 8) ^ \ |
| 106 (hash_table[cur[3]] << 5)) & HASH_4_MASK |
| 107 |
| 108 #endif |
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