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53 lines
2.2 KiB
C
Executable file
53 lines
2.2 KiB
C
Executable file
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Mupen64plus - 7zCrc.c *
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* Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
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* Copyright (C) 2008 Tillin9 *
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* 7-Zip Copyright (C) 1999-2007 Igor Pavlov. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "7zCrc.h"
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#define kCrcPoly 0xEDB88320
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UInt32 g_CrcTable[256];
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void MY_FAST_CALL CrcGenerateTable(void)
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{
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UInt32 i;
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for (i = 0; i < 256; i++)
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{
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UInt32 r = i;
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int j;
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for (j = 0; j < 8; j++)
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r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
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g_CrcTable[i] = r;
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}
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}
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UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 ; size--, p++)
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v = CRC_UPDATE_BYTE(v, *p);
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return v;
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}
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UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)
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{
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return CrcUpdate(CRC_INIT_VAL, data, size) ^ 0xFFFFFFFF;
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}
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