FFmpeg
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 /**
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 <stddef.h>
31 #include <stdint.h>
32 #include "attributes.h"
33 #include "version.h"
34 
35 /**
36  * @defgroup lavu_adler32 Adler-32
37  * @ingroup lavu_hash
38  * Adler-32 hash function implementation.
39  *
40  * @{
41  */
42 
43 #if FF_API_CRYPTO_SIZE_T
44 typedef unsigned long AVAdler;
45 #else
46 typedef uint32_t AVAdler;
47 #endif
48 
49 /**
50  * Calculate the Adler32 checksum of a buffer.
51  *
52  * Passing the return value to a subsequent av_adler32_update() call
53  * allows the checksum of multiple buffers to be calculated as though
54  * they were concatenated.
55  *
56  * @param adler initial checksum value
57  * @param buf pointer to input buffer
58  * @param len size of input buffer
59  * @return updated checksum
60  */
61 AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf,
63  unsigned int len) av_pure;
64 #else
65  size_t len) av_pure;
66 #endif
67 
68 /**
69  * @}
70  */
71 
72 #endif /* AVUTIL_ADLER32_H */
av_pure
#define av_pure
Definition: attributes.h:78
av_adler32_update
AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, unsigned int len) av_pure
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:45
attributes.h
uint8_t
uint8_t
Definition: audio_convert.c:194
len
int len
Definition: vorbis_enc_data.h:452
version.h
FF_API_CRYPTO_SIZE_T
#define FF_API_CRYPTO_SIZE_T
Definition: version.h:124
AVAdler
unsigned long AVAdler
Definition: adler32.h:44