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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.  
  21. #ifndef AVUTIL_ADLER32_H
  22. #define AVUTIL_ADLER32_H
  23.  
  24. #include <stdint.h>
  25. #include "attributes.h"
  26.  
  27. /**
  28.  * @defgroup lavu_adler32 Adler32
  29.  * @ingroup lavu_crypto
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * Calculate the Adler32 checksum of a buffer.
  35.  *
  36.  * Passing the return value to a subsequent av_adler32_update() call
  37.  * allows the checksum of multiple buffers to be calculated as though
  38.  * they were concatenated.
  39.  *
  40.  * @param adler initial checksum value
  41.  * @param buf   pointer to input buffer
  42.  * @param len   size of input buffer
  43.  * @return      updated checksum
  44.  */
  45. unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
  46.                                 unsigned int len) av_pure;
  47.  
  48. /**
  49.  * @}
  50.  */
  51.  
  52. #endif /* AVUTIL_ADLER32_H */
  53.