adler32.h (1696B)
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 /** 22 * @file 23 * @ingroup lavu_adler32 24 * Public header for Adler-32 hash function implementation. 25 */ 26 27 #ifndef AVUTIL_ADLER32_H 28 #define AVUTIL_ADLER32_H 29 30 #include <stddef.h> 31 #include <stdint.h> 32 #include "attributes.h" 33 34 /** 35 * @defgroup lavu_adler32 Adler-32 36 * @ingroup lavu_hash 37 * Adler-32 hash function implementation. 38 * 39 * @{ 40 */ 41 42 typedef uint32_t AVAdler; 43 44 /** 45 * Calculate the Adler32 checksum of a buffer. 46 * 47 * Passing the return value to a subsequent av_adler32_update() call 48 * allows the checksum of multiple buffers to be calculated as though 49 * they were concatenated. 50 * 51 * @param adler initial checksum value 52 * @param buf pointer to input buffer 53 * @param len size of input buffer 54 * @return updated checksum 55 */ 56 AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, 57 size_t len) av_pure; 58 59 /** 60 * @} 61 */ 62 63 #endif /* AVUTIL_ADLER32_H */