1*600f14f4SXin Li /* libFLAC - Free Lossless Audio Codec library 2*600f14f4SXin Li * Copyright (C) 2000-2009 Josh Coalson 3*600f14f4SXin Li * Copyright (C) 2011-2023 Xiph.Org Foundation 4*600f14f4SXin Li * 5*600f14f4SXin Li * Redistribution and use in source and binary forms, with or without 6*600f14f4SXin Li * modification, are permitted provided that the following conditions 7*600f14f4SXin Li * are met: 8*600f14f4SXin Li * 9*600f14f4SXin Li * - Redistributions of source code must retain the above copyright 10*600f14f4SXin Li * notice, this list of conditions and the following disclaimer. 11*600f14f4SXin Li * 12*600f14f4SXin Li * - Redistributions in binary form must reproduce the above copyright 13*600f14f4SXin Li * notice, this list of conditions and the following disclaimer in the 14*600f14f4SXin Li * documentation and/or other materials provided with the distribution. 15*600f14f4SXin Li * 16*600f14f4SXin Li * - Neither the name of the Xiph.org Foundation nor the names of its 17*600f14f4SXin Li * contributors may be used to endorse or promote products derived from 18*600f14f4SXin Li * this software without specific prior written permission. 19*600f14f4SXin Li * 20*600f14f4SXin Li * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21*600f14f4SXin Li * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22*600f14f4SXin Li * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23*600f14f4SXin Li * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24*600f14f4SXin Li * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25*600f14f4SXin Li * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26*600f14f4SXin Li * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27*600f14f4SXin Li * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28*600f14f4SXin Li * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29*600f14f4SXin Li * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30*600f14f4SXin Li * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31*600f14f4SXin Li */ 32*600f14f4SXin Li 33*600f14f4SXin Li #ifndef FLAC__PRIVATE__CRC_H 34*600f14f4SXin Li #define FLAC__PRIVATE__CRC_H 35*600f14f4SXin Li 36*600f14f4SXin Li #include "FLAC/ordinals.h" 37*600f14f4SXin Li 38*600f14f4SXin Li /* 8 bit CRC generator, MSB shifted first 39*600f14f4SXin Li ** polynomial = x^8 + x^2 + x^1 + x^0 40*600f14f4SXin Li ** init = 0 41*600f14f4SXin Li */ 42*600f14f4SXin Li FLAC__uint8 FLAC__crc8(const FLAC__byte *data, uint32_t len); 43*600f14f4SXin Li 44*600f14f4SXin Li /* 16 bit CRC generator, MSB shifted first 45*600f14f4SXin Li ** polynomial = x^16 + x^15 + x^2 + x^0 46*600f14f4SXin Li ** init = 0 47*600f14f4SXin Li */ 48*600f14f4SXin Li extern FLAC__uint16 const FLAC__crc16_table[8][256]; 49*600f14f4SXin Li 50*600f14f4SXin Li #define FLAC__CRC16_UPDATE(data, crc) ((((crc)<<8) & 0xffff) ^ FLAC__crc16_table[0][((crc)>>8) ^ (data)]) 51*600f14f4SXin Li /* this alternate may be faster on some systems/compilers */ 52*600f14f4SXin Li #if 0 53*600f14f4SXin Li #define FLAC__CRC16_UPDATE(data, crc) ((((crc)<<8) ^ FLAC__crc16_table[0][((crc)>>8) ^ (data)]) & 0xffff) 54*600f14f4SXin Li #endif 55*600f14f4SXin Li 56*600f14f4SXin Li FLAC__uint16 FLAC__crc16(const FLAC__byte *data, uint32_t len); 57*600f14f4SXin Li FLAC__uint16 FLAC__crc16_update_words32(const FLAC__uint32 *words, uint32_t len, FLAC__uint16 crc); 58*600f14f4SXin Li FLAC__uint16 FLAC__crc16_update_words64(const FLAC__uint64 *words, uint32_t len, FLAC__uint16 crc); 59*600f14f4SXin Li 60*600f14f4SXin Li #endif 61