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adler32.h
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1 /*
2  * copyright (c) 2006 Mans Rullgard
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #ifndef AVUTIL_ADLER32_H
22 #define AVUTIL_ADLER32_H
23 
24 #include <stdint.h>
25 #include "attributes.h"
26 
27 /**
28  * @defgroup lavu_adler32 Adler32
29  * @ingroup lavu_crypto
30  * @{
31  */
32 
33 /**
34  * Calculate the Adler32 checksum of a buffer.
35  *
36  * Passing the return value to a subsequent av_adler32_update() call
37  * allows the checksum of multiple buffers to be calculated as though
38  * they were concatenated.
39  *
40  * @param adler initial checksum value
41  * @param buf pointer to input buffer
42  * @param len size of input buffer
43  * @return updated checksum
44  */
45 unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
46  unsigned int len) av_pure;
47 
48 /**
49  * @}
50  */
51 
52 #endif /* AVUTIL_ADLER32_H */