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 /* 7zCrc.c -- CRC32 calculation
31 #include "vogl_core.h"
33 #include "lzma_7zCrc.h"
38 #define kCrcPoly 0xEDB88320
39 UInt32 g_CrcTable[256];
41 void MY_FAST_CALL CrcGenerateTable(void)
44 for (i = 0; i < 256; i++)
48 for (j = 0; j < 8; j++)
49 r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
54 UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
56 const Byte *p = (const Byte *)data;
57 for (; size > 0; size--, p++)
58 v = CRC_UPDATE_BYTE(v, *p);
62 UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)
64 return CrcUpdate(CRC_INIT_VAL, data, size) ^ 0xFFFFFFFF;