4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/* LzHash.h -- HASH functions for LZ algorithms
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync2008-10-04 : Igor Pavlov : Public domain */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#ifndef __LZHASH_H
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define __LZHASH_H
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kHash2Size (1 << 10)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kHash3Size (1 << 16)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kHash4Size (1 << 20)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kFix3HashSize (kHash2Size)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kFix4HashSize (kHash2Size + kHash3Size)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define HASH3_CALC { \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = temp & (kHash2Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define HASH4_CALC { \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = temp & (kHash2Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define HASH5_CALC { \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = temp & (kHash2Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash4Value &= (kHash4Size - 1); }
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define MT_HASH2_CALC \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define MT_HASH3_CALC { \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = temp & (kHash2Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#define MT_HASH4_CALC { \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash2Value = temp & (kHash2Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#endif