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| author | Alok Aggarwal <Alok.Aggarwal@Sun.COM> | 2009-03-08 16:47:15 -0400 |
|---|---|---|
| committer | Alok Aggarwal <Alok.Aggarwal@Sun.COM> | 2009-03-08 16:47:15 -0400 |
| commit | b1efbcd6740f24e4bce347c64e48d9b74b472c67 (patch) | |
| tree | 5d3d2e227193402ae8bd7f148aaa62641a494b61 /usr/src/common/lzma/LzHash.h | |
| parent | 46ebaa55cce1df60528a191312d12199d38a4493 (diff) | |
| download | illumos-joyent-b1efbcd6740f24e4bce347c64e48d9b74b472c67.tar.gz | |
PSARC/2008/785 LZMA compression for lofi
6785864 lzma compression support for lofi
Diffstat (limited to 'usr/src/common/lzma/LzHash.h')
| -rw-r--r-- | usr/src/common/lzma/LzHash.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/usr/src/common/lzma/LzHash.h b/usr/src/common/lzma/LzHash.h new file mode 100644 index 0000000000..9f4173e7e3 --- /dev/null +++ b/usr/src/common/lzma/LzHash.h @@ -0,0 +1,54 @@ +/* LzHash.h -- HASH functions for LZ algorithms +2008-10-04 : Igor Pavlov : Public domain */ + +#ifndef __LZHASH_H +#define __LZHASH_H + +#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)cur[1] << 8); + +#define HASH3_CALC { \ + UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } + +#define HASH4_CALC { \ + UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } + +#define HASH5_CALC { \ + UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = (temp ^ ((UInt32)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)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ +#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)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 temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } + +#define MT_HASH4_CALC { \ + UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ + hash2Value = temp & (kHash2Size - 1); \ + hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ + hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } + +#endif |