juce/source/src/audio/audio_file_formats/flac/libFLAC/crc.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "juce_FlacHeader.h"
  33 #if JUCE_USE_FLAC
  34
  35
  36 #if HAVE_CONFIG_H
  37 #  include <config.h>
  38 #endif
  39
  40 #include "include/private/crc.h"
  41
  42 /* CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0 */
  43
  44 FLAC__byte const FLAC__crc8_table[256] = {
  45         0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
  46         0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
  47         0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
  48         0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
  49         0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
  50         0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
  51         0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
  52         0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
  53         0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
  54         0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
  55         0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
  56         0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
  57         0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
  58         0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
  59         0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
  60         0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
  61         0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
  62         0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
  63         0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
  64         0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
  65         0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
  66         0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
  67         0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
  68         0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
  69         0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
  70         0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
  71         0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
  72         0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
  73         0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
  74         0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
  75         0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
  76         0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
  77 };
  78
  79 /* CRC-16, poly = x^16 + x^15 + x^2 + x^0, init = 0 */
  80
  81 unsigned FLAC__crc16_table[256] = {
  82         0x0000,  0x8005,  0x800f,  0x000a,  0x801b,  0x001e,  0x0014,  0x8011,
  83         0x8033,  0x0036,  0x003c,  0x8039,  0x0028,  0x802d,  0x8027,  0x0022,
  84         0x8063,  0x0066,  0x006c,  0x8069,  0x0078,  0x807d,  0x8077,  0x0072,
  85         0x0050,  0x8055,  0x805f,  0x005a,  0x804b,  0x004e,  0x0044,  0x8041,
  86         0x80c3,  0x00c6,  0x00cc,  0x80c9,  0x00d8,  0x80dd,  0x80d7,  0x00d2,
  87         0x00f0,  0x80f5,  0x80ff,  0x00fa,  0x80eb,  0x00ee,  0x00e4,  0x80e1,
  88         0x00a0,  0x80a5,  0x80af,  0x00aa,  0x80bb,  0x00be,  0x00b4,  0x80b1,
  89         0x8093,  0x0096,  0x009c,  0x8099,  0x0088,  0x808d,  0x8087,  0x0082,
  90         0x8183,  0x0186,  0x018c,  0x8189,  0x0198,  0x819d,  0x8197,  0x0192,
  91         0x01b0,  0x81b5,  0x81bf,  0x01ba,  0x81ab,  0x01ae,  0x01a4,  0x81a1,
  92         0x01e0,  0x81e5,  0x81ef,  0x01ea,  0x81fb,  0x01fe,  0x01f4,  0x81f1,
  93         0x81d3,  0x01d6,  0x01dc,  0x81d9,  0x01c8,  0x81cd,  0x81c7,  0x01c2,
  94         0x0140,  0x8145,  0x814f,  0x014a,  0x815b,  0x015e,  0x0154,  0x8151,
  95         0x8173,  0x0176,  0x017c,  0x8179,  0x0168,  0x816d,  0x8167,  0x0162,
  96         0x8123,  0x0126,  0x012c,  0x8129,  0x0138,  0x813d,  0x8137,  0x0132,
  97         0x0110,  0x8115,  0x811f,  0x011a,  0x810b,  0x010e,  0x0104,  0x8101,
  98         0x8303,  0x0306,  0x030c,  0x8309,  0x0318,  0x831d,  0x8317,  0x0312,
  99         0x0330,  0x8335,  0x833f,  0x033a,  0x832b,  0x032e,  0x0324,  0x8321,
 100         0x0360,  0x8365,  0x836f,  0x036a,  0x837b,  0x037e,  0x0374,  0x8371,
 101         0x8353,  0x0356,  0x035c,  0x8359,  0x0348,  0x834d,  0x8347,  0x0342,
 102         0x03c0,  0x83c5,  0x83cf,  0x03ca,  0x83db,  0x03de,  0x03d4,  0x83d1,
 103         0x83f3,  0x03f6,  0x03fc,  0x83f9,  0x03e8,  0x83ed,  0x83e7,  0x03e2,
 104         0x83a3,  0x03a6,  0x03ac,  0x83a9,  0x03b8,  0x83bd,  0x83b7,  0x03b2,
 105         0x0390,  0x8395,  0x839f,  0x039a,  0x838b,  0x038e,  0x0384,  0x8381,
 106         0x0280,  0x8285,  0x828f,  0x028a,  0x829b,  0x029e,  0x0294,  0x8291,
 107         0x82b3,  0x02b6,  0x02bc,  0x82b9,  0x02a8,  0x82ad,  0x82a7,  0x02a2,
 108         0x82e3,  0x02e6,  0x02ec,  0x82e9,  0x02f8,  0x82fd,  0x82f7,  0x02f2,
 109         0x02d0,  0x82d5,  0x82df,  0x02da,  0x82cb,  0x02ce,  0x02c4,  0x82c1,
 110         0x8243,  0x0246,  0x024c,  0x8249,  0x0258,  0x825d,  0x8257,  0x0252,
 111         0x0270,  0x8275,  0x827f,  0x027a,  0x826b,  0x026e,  0x0264,  0x8261,
 112         0x0220,  0x8225,  0x822f,  0x022a,  0x823b,  0x023e,  0x0234,  0x8231,
 113         0x8213,  0x0216,  0x021c,  0x8219,  0x0208,  0x820d,  0x8207,  0x0202
 114 };
 115
 116
 117 void FLAC__crc8_update(const FLAC__byte data, FLAC__uint8 *crc)
 118 {
 119         *crc = FLAC__crc8_table[*crc ^ data];
 120 }
 121
 122 void FLAC__crc8_update_block(const FLAC__byte *data, unsigned len, FLAC__uint8 *crc)
 123 {
 124         while(len--)
 125                 *crc = FLAC__crc8_table[*crc ^ *data++];
 126 }
 127
 128 FLAC__uint8 FLAC__crc8(const FLAC__byte *data, unsigned len)
 129 {
 130         FLAC__uint8 crc = 0;
 131
 132         while(len--)
 133                 crc = FLAC__crc8_table[crc ^ *data++];
 134
 135         return crc;
 136 }
 137
 138 unsigned FLAC__crc16(const FLAC__byte *data, unsigned len)
 139 {
 140         unsigned crc = 0;
 141
 142         while(len--)
 143                 crc = ((crc<<8) ^ FLAC__crc16_table[(crc>>8) ^ *data++]) & 0xffff;
 144
 145         return crc;
 146 }
 147
 148 #endif