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- // VirtualDub - Video processing and capture application
- // Video decoding library
- // Copyright (C) 1998-2006 Avery Lee
- //
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 2 of the License, or
- // (at your option) any later version.
- //
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software
- // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- #include "common_png.h"
-
- namespace nsVDPNG {
- extern const uint8 kPNGSignature[8]={137,80,78,71,13,10,26,10};
- };
-
- void VDAdler32Checker::Process(const void *src, sint32 len) {
- const uint8 *s = (const uint8 *)src;
-
- while(len > 0) {
- uint32 tc = len;
- if (tc > 0x1000)
- tc = 0x1000;
-
- len -= tc;
- do {
- mS1 += *s++;
- mS2 += mS1;
- } while(--tc);
-
- mS1 %= 65521;
- mS2 %= 65521;
- }
- }
-