2 * Glide64 - Glide video plugin for Nintendo 64 emulators.
3 * Copyright (c) 2002 Dave2001
4 * Copyright (c) 2003-2009 Sergey 'Gonetz' Lipski
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 //****************************************************************
23 // Glide64 - Glide Plugin for Nintendo 64 emulators
24 // Project started on December 29th, 2001
27 // Dave2001, original author, founded the project in 2001, left it in 2002
28 // Gugaman, joined the project in 2002, left it in 2002
29 // Sergey 'Gonetz' Lipski, joined the project in 2002, main author since fall of 2002
30 // Hiroshi 'KoolSmoky' Morii, joined the project in 2007
32 //****************************************************************
35 // * 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.
36 // * 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.
38 //****************************************************************
40 // CRC32 calculation functions
42 // Created by Gonetz, 2004
44 //****************************************************************
47 #define CRC32_POLYNOMIAL 0x04C11DB7
49 unsigned int CRCTable[ 256 ];
51 unsigned int Reflect( unsigned int ref, char ch )
53 unsigned int value = 0;
55 // Swap bit 0 for bit 7
56 // bit 1 for bit 6, etc.
57 for (char i = 1; i < (ch + 1); i++)
60 value |= 1 << (ch - i);
70 for (unsigned i = 0; i <= 255; i++)
72 crc = Reflect( i, 8 ) << 24;
73 for (unsigned j = 0; j < 8; j++)
74 crc = (crc << 1) ^ (crc & (1 << 31) ? CRC32_POLYNOMIAL : 0);
76 CRCTable[i] = Reflect( crc, 32 );
81 unsigned int CRC32( unsigned int crc, void *buffer, unsigned int count )
83 unsigned int orig = crc;
84 unsigned char * p = reinterpret_cast<unsigned char*>(buffer);
86 crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
92 wxUint32 CRC_Calculate( wxUint32 crc, void *buffer, wxUint32 count )
104 xor al, byte ptr [esi]
106 mov ebx, [CRCTable+eax*4]
118 unsigned int CRC_Calculate( unsigned int crc, void *buffer, unsigned int count )
120 unsigned int Crc32=crc;
128 mov bl, byte ptr [esi]
133 mov ebx, [CRCTable+eax*4]