diff options
Diffstat (limited to 'depends/lzma/pavlov/LzHash.h')
| -rwxr-xr-x | depends/lzma/pavlov/LzHash.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/depends/lzma/pavlov/LzHash.h b/depends/lzma/pavlov/LzHash.h new file mode 100755 index 00000000..22cb0430 --- /dev/null +++ b/depends/lzma/pavlov/LzHash.h @@ -0,0 +1,62 @@ +/* LzHash.h -- HASH functions for LZ algorithms +2008-10-04 : Igor Pavlov : Public domain */ + +#pragma once + +#define kHash2Size (1 << 10) +#define kHash3Size (1 << 16) +#define kHash4Size (1 << 20) + +#define kFix3HashSize (kHash2Size) +#define kFix4HashSize (kHash2Size + kHash3Size) +#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) + +#define HASH2_CALC hashValue = cur[0] | ((uint32_t)cur[1] << 8); + +#define HASH3_CALC \ + { \ + uint32_t temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hashValue = (temp ^ ((uint32_t)cur[2] << 8)) & p->hashMask; \ + } + +#define HASH4_CALC \ + { \ + uint32_t temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((uint32_t)cur[2] << 8)) & (kHash3Size - 1); \ + hashValue = (temp ^ ((uint32_t)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; \ + } + +#define HASH5_CALC \ + { \ + uint32_t temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((uint32_t)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = (temp ^ ((uint32_t)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ + hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ + hash4Value &= (kHash4Size - 1); \ + } + +/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((uint32_t)cur[1] << 8)) ^ p->crc[cur[2]]) & + * 0xFFFF; */ +#define HASH_ZIP_CALC \ + hashValue = ((cur[2] | ((uint32_t)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; + +#define MT_HASH2_CALC hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); + +#define MT_HASH3_CALC \ + { \ + uint32_t temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((uint32_t)cur[2] << 8)) & (kHash3Size - 1); \ + } + +#define MT_HASH4_CALC \ + { \ + uint32_t temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((uint32_t)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = \ + (temp ^ ((uint32_t)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); \ + } |