2 * copyright (c) 2006 Mans Rullgard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @ingroup lavu_adler32
24 * Public header for Adler-32 hash function implementation.
27 #ifndef AVUTIL_ADLER32_H
28 #define AVUTIL_ADLER32_H
31 #include "attributes.h"
34 * @defgroup lavu_adler32 Adler-32
36 * Adler-32 hash function implementation.
42 * Calculate the Adler32 checksum of a buffer.
44 * Passing the return value to a subsequent av_adler32_update() call
45 * allows the checksum of multiple buffers to be calculated as though
46 * they were concatenated.
48 * @param adler initial checksum value
49 * @param buf pointer to input buffer
50 * @param len size of input buffer
51 * @return updated checksum
53 unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
54 unsigned int len) av_pure;
60 #endif /* AVUTIL_ADLER32_H */