d6b93c38d28e3ba3418b49c00f869c9c616f5e92
[libav.git] / libavutil / crc.h
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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 FFMPEG_CRC_H
22 #define FFMPEG_CRC_H
23
24 #include <stdint.h>
25 #include <stddef.h>
26
27 typedef uint32_t AVCRC;
28
29 typedef enum {
30 AV_CRC_8_ATM,
31 AV_CRC_16_ANSI,
32 AV_CRC_16_CCITT,
33 AV_CRC_32_IEEE,
34 AV_CRC_32_IEEE_LE, /*< reversed bitorder version of AV_CRC_32_IEEE */
35 AV_CRC_MAX, /*< not part of public API! don't use outside lavu */
36 }AVCRCId;
37
38 int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
39 const AVCRC *av_crc_get_table(AVCRCId crc_id);
40 uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length);
41
42 #endif /* FFMPEG_CRC_H */
43