1 /**************************************************************************
3 * Copyright 2013-2014 RAD Game Tools and Valve Software
4 * Copyright 2010-2014 Rich Geldreich and Tenacious Software LLC
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 **************************************************************************/
27 /* LzHash.h -- HASH functions for LZ algorithms
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28 2008-10-04 : Igor Pavlov : Public domain */
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33 #define kHash2Size (1 << 10)
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34 #define kHash3Size (1 << 16)
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35 #define kHash4Size (1 << 20)
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37 #define kFix3HashSize (kHash2Size)
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38 #define kFix4HashSize (kHash2Size + kHash3Size)
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39 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
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41 #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
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43 #define HASH3_CALC \
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45 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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46 hash2Value = temp & (kHash2Size - 1); \
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47 hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; \
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50 #define HASH4_CALC \
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52 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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53 hash2Value = temp & (kHash2Size - 1); \
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54 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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55 hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; \
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58 #define HASH5_CALC \
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60 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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61 hash2Value = temp & (kHash2Size - 1); \
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62 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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63 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
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64 hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
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65 hash4Value &= (kHash4Size - 1); \
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68 /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
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69 #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
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71 #define MT_HASH2_CALC \
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72 hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
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74 #define MT_HASH3_CALC \
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76 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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77 hash2Value = temp & (kHash2Size - 1); \
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78 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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81 #define MT_HASH4_CALC \
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83 UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
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84 hash2Value = temp & (kHash2Size - 1); \
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85 hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
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86 hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); \
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