92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* Glide64 - Glide video plugin for Nintendo 64 emulators.
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* Copyright (c) 2002 Dave2001
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* Copyright (c) 2008 Günther <guenther.emu@freenet.de>
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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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* 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
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* Licence along with this program; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA
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*/
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//****************************************************************
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//
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// Glide64 - Glide Plugin for Nintendo 64 emulators (tested mostly with Project64)
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// Project started on December 29th, 2001
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//
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// To modify Glide64:
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// * Write your name and (optional)email, commented by your work, so I know who did it, and so that you can find which parts you modified when it comes time to send it to me.
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// * Do NOT send me the whole project or file that you modified. Take out your modified code sections, and tell me where to put them. If people sent the whole thing, I would have many different versions, but no idea how to combine them all.
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//
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// Official Glide64 development channel: #Glide64 on EFnet
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//
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// Original author: Dave2001 (Dave2999@hotmail.com)
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// Other authors: Gonetz, Gugaman
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//
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//****************************************************************
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//
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// CRC32 calculation functions
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//
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// Created by Gonetz, 2004
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//
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//****************************************************************
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#if !defined(WIN32) && defined(GCC)
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#define Crc32 _Crc32
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#define CRCTable _CRCTable
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#endif
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extern unsigned int CRCTable[ 256 ];
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void CRC_BuildTable();
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inline unsigned int CRC_Calculate( unsigned int crc, const void *buffer, unsigned int count )
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{
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#if !defined(__GNUC__) && !defined(NO_ASM)
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unsigned int Crc32=crc;
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__asm {
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mov esi, buffer
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mov edx, count
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add edx, esi
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mov ecx, crc
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loop1:
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mov bl, byte ptr [esi]
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movzx eax, cl
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inc esi
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xor al, bl
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shr ecx, 8
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mov ebx, [CRCTable+eax*4]
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xor ecx, ebx
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cmp edx, esi
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jne loop1
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xor Crc32, ecx
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}
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return Crc32;
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#else
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unsigned int result = crc;
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for (const char * p = (const char*)buffer; p != (const char*)buffer + count; ++p)
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{
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unsigned char al = result;
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al ^= *p;
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result >>= 8;
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result ^= CRCTable[al];
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}
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result ^= crc;
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return result;
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#endif
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}
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