crc.h (1474B)
1 /* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of Libav. 5 * 6 * Libav 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 * Libav 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 Libav; 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_CRC_H 22 #define AVUTIL_CRC_H 23 24 #include <stdint.h> 25 #include <stddef.h> 26 #include "attributes.h" 27 28 typedef uint32_t AVCRC; 29 30 typedef enum { 31 AV_CRC_8_ATM, 32 AV_CRC_16_ANSI, 33 AV_CRC_16_CCITT, 34 AV_CRC_32_IEEE, 35 AV_CRC_32_IEEE_LE, /*< reversed bitorder version of AV_CRC_32_IEEE */ 36 AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */ 37 }AVCRCId; 38 39 int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size); 40 const AVCRC *av_crc_get_table(AVCRCId crc_id); 41 uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure; 42 43 #endif /* AVUTIL_CRC_H */