1*8996SAlok.Aggarwal@Sun.COM /* LzHash.h -- HASH functions for LZ algorithms 2*8996SAlok.Aggarwal@Sun.COM 2008-10-04 : Igor Pavlov : Public domain */ 3*8996SAlok.Aggarwal@Sun.COM 4*8996SAlok.Aggarwal@Sun.COM #ifndef __LZHASH_H 5*8996SAlok.Aggarwal@Sun.COM #define __LZHASH_H 6*8996SAlok.Aggarwal@Sun.COM 7*8996SAlok.Aggarwal@Sun.COM #define kHash2Size (1 << 10) 8*8996SAlok.Aggarwal@Sun.COM #define kHash3Size (1 << 16) 9*8996SAlok.Aggarwal@Sun.COM #define kHash4Size (1 << 20) 10*8996SAlok.Aggarwal@Sun.COM 11*8996SAlok.Aggarwal@Sun.COM #define kFix3HashSize (kHash2Size) 12*8996SAlok.Aggarwal@Sun.COM #define kFix4HashSize (kHash2Size + kHash3Size) 13*8996SAlok.Aggarwal@Sun.COM #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size) 14*8996SAlok.Aggarwal@Sun.COM 15*8996SAlok.Aggarwal@Sun.COM #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8); 16*8996SAlok.Aggarwal@Sun.COM 17*8996SAlok.Aggarwal@Sun.COM #define HASH3_CALC { \ 18*8996SAlok.Aggarwal@Sun.COM UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 19*8996SAlok.Aggarwal@Sun.COM hash2Value = temp & (kHash2Size - 1); \ 20*8996SAlok.Aggarwal@Sun.COM hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; } 21*8996SAlok.Aggarwal@Sun.COM 22*8996SAlok.Aggarwal@Sun.COM #define HASH4_CALC { \ 23*8996SAlok.Aggarwal@Sun.COM UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 24*8996SAlok.Aggarwal@Sun.COM hash2Value = temp & (kHash2Size - 1); \ 25*8996SAlok.Aggarwal@Sun.COM hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 26*8996SAlok.Aggarwal@Sun.COM hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; } 27*8996SAlok.Aggarwal@Sun.COM 28*8996SAlok.Aggarwal@Sun.COM #define HASH5_CALC { \ 29*8996SAlok.Aggarwal@Sun.COM UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 30*8996SAlok.Aggarwal@Sun.COM hash2Value = temp & (kHash2Size - 1); \ 31*8996SAlok.Aggarwal@Sun.COM hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 32*8996SAlok.Aggarwal@Sun.COM hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \ 33*8996SAlok.Aggarwal@Sun.COM hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \ 34*8996SAlok.Aggarwal@Sun.COM hash4Value &= (kHash4Size - 1); } 35*8996SAlok.Aggarwal@Sun.COM 36*8996SAlok.Aggarwal@Sun.COM /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */ 37*8996SAlok.Aggarwal@Sun.COM #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF; 38*8996SAlok.Aggarwal@Sun.COM 39*8996SAlok.Aggarwal@Sun.COM 40*8996SAlok.Aggarwal@Sun.COM #define MT_HASH2_CALC \ 41*8996SAlok.Aggarwal@Sun.COM hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1); 42*8996SAlok.Aggarwal@Sun.COM 43*8996SAlok.Aggarwal@Sun.COM #define MT_HASH3_CALC { \ 44*8996SAlok.Aggarwal@Sun.COM UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 45*8996SAlok.Aggarwal@Sun.COM hash2Value = temp & (kHash2Size - 1); \ 46*8996SAlok.Aggarwal@Sun.COM hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); } 47*8996SAlok.Aggarwal@Sun.COM 48*8996SAlok.Aggarwal@Sun.COM #define MT_HASH4_CALC { \ 49*8996SAlok.Aggarwal@Sun.COM UInt32 temp = p->crc[cur[0]] ^ cur[1]; \ 50*8996SAlok.Aggarwal@Sun.COM hash2Value = temp & (kHash2Size - 1); \ 51*8996SAlok.Aggarwal@Sun.COM hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \ 52*8996SAlok.Aggarwal@Sun.COM hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); } 53*8996SAlok.Aggarwal@Sun.COM 54*8996SAlok.Aggarwal@Sun.COM #endif 55