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