crc.h
Go to the documentation of this file.
1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; 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_CRC_H
22 #define AVUTIL_CRC_H
23 
24 #include <stdint.h>
25 #include <stddef.h>
26 #include "attributes.h"
27 
28 typedef uint32_t AVCRC;
29 
30 typedef enum {
31  AV_CRC_8_ATM,
32  AV_CRC_16_ANSI,
33  AV_CRC_16_CCITT,
34  AV_CRC_32_IEEE,
35  AV_CRC_32_IEEE_LE, /*< reversed bitorder version of AV_CRC_32_IEEE */
36  AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */
37 }AVCRCId;
38 
39 int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
40 const AVCRC *av_crc_get_table(AVCRCId crc_id);
41 uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
42 
43 #endif /* AVUTIL_CRC_H */
44