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 AVUTIL_CRC_H
  22 #define AVUTIL_CRC_H
  23
  24 #include <stdint.h>
  25 #include <stddef.h>
  26 #include "common.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