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Encoder and Decoder for FLAC files including Java Sound SPI
package org.jflac.util;
/**
* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2000,2001,2002,2003 Josh Coalson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* Utility class to calculate 8-bit CRC.
* @author kc7bfi
*/
public final class CRC8 {
// CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0
private static final byte[] CRC8_TABLE =
new byte[] {
(byte) 0x00,
(byte) 0x07,
(byte) 0x0E,
(byte) 0x09,
(byte) 0x1C,
(byte) 0x1B,
(byte) 0x12,
(byte) 0x15,
(byte) 0x38,
(byte) 0x3F,
(byte) 0x36,
(byte) 0x31,
(byte) 0x24,
(byte) 0x23,
(byte) 0x2A,
(byte) 0x2D,
(byte) 0x70,
(byte) 0x77,
(byte) 0x7E,
(byte) 0x79,
(byte) 0x6C,
(byte) 0x6B,
(byte) 0x62,
(byte) 0x65,
(byte) 0x48,
(byte) 0x4F,
(byte) 0x46,
(byte) 0x41,
(byte) 0x54,
(byte) 0x53,
(byte) 0x5A,
(byte) 0x5D,
(byte) 0xE0,
(byte) 0xE7,
(byte) 0xEE,
(byte) 0xE9,
(byte) 0xFC,
(byte) 0xFB,
(byte) 0xF2,
(byte) 0xF5,
(byte) 0xD8,
(byte) 0xDF,
(byte) 0xD6,
(byte) 0xD1,
(byte) 0xC4,
(byte) 0xC3,
(byte) 0xCA,
(byte) 0xCD,
(byte) 0x90,
(byte) 0x97,
(byte) 0x9E,
(byte) 0x99,
(byte) 0x8C,
(byte) 0x8B,
(byte) 0x82,
(byte) 0x85,
(byte) 0xA8,
(byte) 0xAF,
(byte) 0xA6,
(byte) 0xA1,
(byte) 0xB4,
(byte) 0xB3,
(byte) 0xBA,
(byte) 0xBD,
(byte) 0xC7,
(byte) 0xC0,
(byte) 0xC9,
(byte) 0xCE,
(byte) 0xDB,
(byte) 0xDC,
(byte) 0xD5,
(byte) 0xD2,
(byte) 0xFF,
(byte) 0xF8,
(byte) 0xF1,
(byte) 0xF6,
(byte) 0xE3,
(byte) 0xE4,
(byte) 0xED,
(byte) 0xEA,
(byte) 0xB7,
(byte) 0xB0,
(byte) 0xB9,
(byte) 0xBE,
(byte) 0xAB,
(byte) 0xAC,
(byte) 0xA5,
(byte) 0xA2,
(byte) 0x8F,
(byte) 0x88,
(byte) 0x81,
(byte) 0x86,
(byte) 0x93,
(byte) 0x94,
(byte) 0x9D,
(byte) 0x9A,
(byte) 0x27,
(byte) 0x20,
(byte) 0x29,
(byte) 0x2E,
(byte) 0x3B,
(byte) 0x3C,
(byte) 0x35,
(byte) 0x32,
(byte) 0x1F,
(byte) 0x18,
(byte) 0x11,
(byte) 0x16,
(byte) 0x03,
(byte) 0x04,
(byte) 0x0D,
(byte) 0x0A,
(byte) 0x57,
(byte) 0x50,
(byte) 0x59,
(byte) 0x5E,
(byte) 0x4B,
(byte) 0x4C,
(byte) 0x45,
(byte) 0x42,
(byte) 0x6F,
(byte) 0x68,
(byte) 0x61,
(byte) 0x66,
(byte) 0x73,
(byte) 0x74,
(byte) 0x7D,
(byte) 0x7A,
(byte) 0x89,
(byte) 0x8E,
(byte) 0x87,
(byte) 0x80,
(byte) 0x95,
(byte) 0x92,
(byte) 0x9B,
(byte) 0x9C,
(byte) 0xB1,
(byte) 0xB6,
(byte) 0xBF,
(byte) 0xB8,
(byte) 0xAD,
(byte) 0xAA,
(byte) 0xA3,
(byte) 0xA4,
(byte) 0xF9,
(byte) 0xFE,
(byte) 0xF7,
(byte) 0xF0,
(byte) 0xE5,
(byte) 0xE2,
(byte) 0xEB,
(byte) 0xEC,
(byte) 0xC1,
(byte) 0xC6,
(byte) 0xCF,
(byte) 0xC8,
(byte) 0xDD,
(byte) 0xDA,
(byte) 0xD3,
(byte) 0xD4,
(byte) 0x69,
(byte) 0x6E,
(byte) 0x67,
(byte) 0x60,
(byte) 0x75,
(byte) 0x72,
(byte) 0x7B,
(byte) 0x7C,
(byte) 0x51,
(byte) 0x56,
(byte) 0x5F,
(byte) 0x58,
(byte) 0x4D,
(byte) 0x4A,
(byte) 0x43,
(byte) 0x44,
(byte) 0x19,
(byte) 0x1E,
(byte) 0x17,
(byte) 0x10,
(byte) 0x05,
(byte) 0x02,
(byte) 0x0B,
(byte) 0x0C,
(byte) 0x21,
(byte) 0x26,
(byte) 0x2F,
(byte) 0x28,
(byte) 0x3D,
(byte) 0x3A,
(byte) 0x33,
(byte) 0x34,
(byte) 0x4E,
(byte) 0x49,
(byte) 0x40,
(byte) 0x47,
(byte) 0x52,
(byte) 0x55,
(byte) 0x5C,
(byte) 0x5B,
(byte) 0x76,
(byte) 0x71,
(byte) 0x78,
(byte) 0x7F,
(byte) 0x6A,
(byte) 0x6D,
(byte) 0x64,
(byte) 0x63,
(byte) 0x3E,
(byte) 0x39,
(byte) 0x30,
(byte) 0x37,
(byte) 0x22,
(byte) 0x25,
(byte) 0x2C,
(byte) 0x2B,
(byte) 0x06,
(byte) 0x01,
(byte) 0x08,
(byte) 0x0F,
(byte) 0x1A,
(byte) 0x1D,
(byte) 0x14,
(byte) 0x13,
(byte) 0xAE,
(byte) 0xA9,
(byte) 0xA0,
(byte) 0xA7,
(byte) 0xB2,
(byte) 0xB5,
(byte) 0xBC,
(byte) 0xBB,
(byte) 0x96,
(byte) 0x91,
(byte) 0x98,
(byte) 0x9F,
(byte) 0x8A,
(byte) 0x8D,
(byte) 0x84,
(byte) 0x83,
(byte) 0xDE,
(byte) 0xD9,
(byte) 0xD0,
(byte) 0xD7,
(byte) 0xC2,
(byte) 0xC5,
(byte) 0xCC,
(byte) 0xCB,
(byte) 0xE6,
(byte) 0xE1,
(byte) 0xE8,
(byte) 0xEF,
(byte) 0xFA,
(byte) 0xFD,
(byte) 0xF4,
(byte) 0xF3 };
/**
* Update the CRC value with a byte data.
*
* @param data The byte data
* @param crc The starting CRC value
* @return The updated CRC value
*/
public static byte update(byte data, byte crc) {
return CRC8_TABLE[crc ^ data];
}
/**
* Update the CRC value with data from a byte array.
*
* @param data The byte array
* @param len The byte array length
* @param crc The starting CRC value
* @return The updated CRC value
*/
public static byte updateBlock(byte[] data, int len, byte crc) {
for (int i = 0; i < len; i++)
crc = CRC8_TABLE[crc ^ data[i]];
return crc;
}
/**
* Calculate the CRC value with data from a byte array.
*
* @param data The byte array
* @param len The byte array length
* @return The calculated CRC value
*/
public static byte calc(byte[] data, int len) {
byte crc = 0;
for (int i = 0; i < len; i++)
crc = CRC8_TABLE[(crc ^ data[i]) & 0xff];
return crc;
}
}