crc.h 1.4 KB

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  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. #ifndef AVUTIL_CRC_H
  21. #define AVUTIL_CRC_H
  22. #include <stdint.h>
  23. #include <stddef.h>
  24. #include "attributes.h"
  25. typedef uint32_t AVCRC;
  26. typedef enum {
  27. AV_CRC_8_ATM,
  28. AV_CRC_16_ANSI,
  29. AV_CRC_16_CCITT,
  30. AV_CRC_32_IEEE,
  31. AV_CRC_32_IEEE_LE, /*< reversed bitorder version of AV_CRC_32_IEEE */
  32. AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */
  33. }AVCRCId;
  34. int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
  35. const AVCRC *av_crc_get_table(AVCRCId crc_id);
  36. uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
  37. #endif /* AVUTIL_CRC_H */