| /* libFLAC - Free Lossless Audio Codec library |
| * Copyright (C) 2000-2009 Josh Coalson |
| * Copyright (C) 2011-2018 Xiph.Org Foundation |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * - Neither the name of the Xiph.org Foundation nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef FLAC__PRIVATE__CRC_H |
| #define FLAC__PRIVATE__CRC_H |
| |
| #include "FLAC/ordinals.h" |
| |
| /* 8 bit CRC generator, MSB shifted first |
| ** polynomial = x^8 + x^2 + x^1 + x^0 |
| ** init = 0 |
| */ |
| FLAC__uint8 FLAC__crc8(const FLAC__byte *data, uint32_t len); |
| |
| /* 16 bit CRC generator, MSB shifted first |
| ** polynomial = x^16 + x^15 + x^2 + x^0 |
| ** init = 0 |
| */ |
| extern uint32_t const FLAC__crc16_table[256]; |
| |
| #define FLAC__CRC16_UPDATE(data, crc) ((((crc)<<8) & 0xffff) ^ FLAC__crc16_table[((crc)>>8) ^ (data)]) |
| /* this alternate may be faster on some systems/compilers */ |
| #if 0 |
| #define FLAC__CRC16_UPDATE(data, crc) ((((crc)<<8) ^ FLAC__crc16_table[((crc)>>8) ^ (data)]) & 0xffff) |
| #endif |
| |
| uint32_t FLAC__crc16(const FLAC__byte *data, uint32_t len); |
| |
| #endif |