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 /**
22  * @file
23  * @ingroup lavu_adler32
24  * Public header for Adler-32 hash function implementation.
25  */
26 
27 #ifndef AVUTIL_ADLER32_H
28 #define AVUTIL_ADLER32_H
29 
30 #include <stdint.h>
31 #include "attributes.h"
32 
33 /**
34  * @defgroup lavu_adler32 Adler-32
35  * @ingroup lavu_hash
36  * Adler-32 hash function implementation.
37  *
38  * @{
39  */
40 
41 /**
42  * Calculate the Adler32 checksum of a buffer.
43  *
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.
47  *
48  * @param adler initial checksum value
49  * @param buf   pointer to input buffer
50  * @param len   size of input buffer
51  * @return      updated checksum
52  */
53 unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
54                                 unsigned int len) av_pure;
55 
56 /**
57  * @}
58  */
59 
60 #endif /* AVUTIL_ADLER32_H */
61