adler32.h 1.4 KB

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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. #ifndef AVUTIL_ADLER32_H
  21. #define AVUTIL_ADLER32_H
  22. #include <stdint.h>
  23. #include "attributes.h"
  24. /**
  25. * @ingroup lavu_crypto
  26. * Calculate the Adler32 checksum of a buffer.
  27. *
  28. * Passing the return value to a subsequent av_adler32_update() call
  29. * allows the checksum of multiple buffers to be calculated as though
  30. * they were concatenated.
  31. *
  32. * @param adler initial checksum value
  33. * @param buf pointer to input buffer
  34. * @param len size of input buffer
  35. * @return updated checksum
  36. */
  37. unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
  38. unsigned int len) av_pure;
  39. #endif /* AVUTIL_ADLER32_H */