mirror of
https://github.com/chibicitiberiu/libflac-sharp
synced 2024-02-24 04:53:30 +00:00
320 lines
8.0 KiB
C#
320 lines
8.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Flac.Util
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{
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/// <summary>
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/// Utility class to calculate 8-bit CRC.
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/// </summary>
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public static class CRC8
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{
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#region private static UInt16[] Crc16Table
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// CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0
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private static byte[] Crc8Table =
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new byte[] {
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(byte) 0x00,
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(byte) 0x07,
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(byte) 0x0E,
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(byte) 0x09,
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(byte) 0x1C,
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(byte) 0x1B,
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(byte) 0x12,
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(byte) 0x15,
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(byte) 0x38,
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(byte) 0x3F,
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(byte) 0x36,
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(byte) 0x31,
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(byte) 0x24,
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(byte) 0x23,
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(byte) 0x2A,
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(byte) 0x2D,
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(byte) 0x70,
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(byte) 0x77,
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(byte) 0x7E,
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(byte) 0x79,
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(byte) 0x6C,
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(byte) 0x6B,
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(byte) 0x62,
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(byte) 0x65,
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(byte) 0x48,
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(byte) 0x4F,
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(byte) 0x46,
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(byte) 0x41,
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(byte) 0x54,
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(byte) 0x53,
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(byte) 0x5A,
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(byte) 0x5D,
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(byte) 0xE0,
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(byte) 0xE7,
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(byte) 0xEE,
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(byte) 0xE9,
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(byte) 0xFC,
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(byte) 0xFB,
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(byte) 0xF2,
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(byte) 0xF5,
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(byte) 0xD8,
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(byte) 0xDF,
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(byte) 0xD6,
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(byte) 0xD1,
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(byte) 0xC4,
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(byte) 0xC3,
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(byte) 0xCA,
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(byte) 0xCD,
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(byte) 0x90,
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(byte) 0x97,
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(byte) 0x9E,
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(byte) 0x99,
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(byte) 0x8C,
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(byte) 0x8B,
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(byte) 0x82,
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(byte) 0x85,
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(byte) 0xA8,
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(byte) 0xAF,
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(byte) 0xA6,
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(byte) 0xA1,
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(byte) 0xB4,
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(byte) 0xB3,
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(byte) 0xBA,
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(byte) 0xBD,
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(byte) 0xC7,
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(byte) 0xC0,
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(byte) 0xC9,
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(byte) 0xCE,
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(byte) 0xDB,
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(byte) 0xDC,
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(byte) 0xD5,
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(byte) 0xD2,
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(byte) 0xFF,
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(byte) 0xF8,
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(byte) 0xF1,
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(byte) 0xF6,
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(byte) 0xE3,
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(byte) 0xE4,
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(byte) 0xED,
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(byte) 0xEA,
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(byte) 0xB7,
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(byte) 0xB0,
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(byte) 0xB9,
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(byte) 0xBE,
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(byte) 0xAB,
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(byte) 0xAC,
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(byte) 0xA5,
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(byte) 0xA2,
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(byte) 0x8F,
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(byte) 0x88,
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(byte) 0x81,
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(byte) 0x86,
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(byte) 0x93,
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(byte) 0x94,
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(byte) 0x9D,
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(byte) 0x9A,
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(byte) 0x27,
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(byte) 0x20,
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(byte) 0x29,
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(byte) 0x2E,
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(byte) 0x3B,
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(byte) 0x3C,
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(byte) 0x35,
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(byte) 0x32,
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(byte) 0x1F,
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(byte) 0x18,
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(byte) 0x11,
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(byte) 0x16,
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(byte) 0x03,
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(byte) 0x04,
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(byte) 0x0D,
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(byte) 0x0A,
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(byte) 0x57,
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(byte) 0x50,
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(byte) 0x59,
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(byte) 0x5E,
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(byte) 0x4B,
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(byte) 0x4C,
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(byte) 0x45,
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(byte) 0x42,
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(byte) 0x6F,
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(byte) 0x68,
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(byte) 0x61,
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(byte) 0x66,
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(byte) 0x73,
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(byte) 0x74,
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(byte) 0x7D,
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(byte) 0x7A,
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(byte) 0x89,
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(byte) 0x8E,
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(byte) 0x87,
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(byte) 0x80,
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(byte) 0x95,
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(byte) 0x92,
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(byte) 0x9B,
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(byte) 0x9C,
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(byte) 0xB1,
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(byte) 0xB6,
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(byte) 0xBF,
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(byte) 0xB8,
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(byte) 0xAD,
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(byte) 0xAA,
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(byte) 0xA3,
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(byte) 0xA4,
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(byte) 0xF9,
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(byte) 0xFE,
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(byte) 0xF7,
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(byte) 0xF0,
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(byte) 0xE5,
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(byte) 0xE2,
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(byte) 0xEB,
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(byte) 0xEC,
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(byte) 0xC1,
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(byte) 0xC6,
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(byte) 0xCF,
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(byte) 0xC8,
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(byte) 0xDD,
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(byte) 0xDA,
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(byte) 0xD3,
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(byte) 0xD4,
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(byte) 0x69,
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(byte) 0x6E,
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(byte) 0x67,
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(byte) 0x60,
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(byte) 0x75,
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(byte) 0x72,
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(byte) 0x7B,
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(byte) 0x7C,
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(byte) 0x51,
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(byte) 0x56,
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(byte) 0x5F,
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(byte) 0x58,
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(byte) 0x4D,
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(byte) 0x4A,
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(byte) 0x43,
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(byte) 0x44,
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(byte) 0x19,
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(byte) 0x1E,
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(byte) 0x17,
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(byte) 0x10,
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(byte) 0x05,
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(byte) 0x02,
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(byte) 0x0B,
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(byte) 0x0C,
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(byte) 0x21,
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(byte) 0x26,
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(byte) 0x2F,
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(byte) 0x28,
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(byte) 0x3D,
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(byte) 0x3A,
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(byte) 0x33,
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(byte) 0x34,
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(byte) 0x4E,
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(byte) 0x49,
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(byte) 0x40,
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(byte) 0x47,
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(byte) 0x52,
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(byte) 0x55,
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(byte) 0x5C,
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(byte) 0x5B,
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(byte) 0x76,
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(byte) 0x71,
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(byte) 0x78,
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(byte) 0x7F,
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(byte) 0x6A,
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(byte) 0x6D,
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(byte) 0x64,
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(byte) 0x63,
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(byte) 0x3E,
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(byte) 0x39,
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(byte) 0x30,
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(byte) 0x37,
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(byte) 0x22,
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(byte) 0x25,
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(byte) 0x2C,
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(byte) 0x2B,
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(byte) 0x06,
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(byte) 0x01,
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(byte) 0x08,
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(byte) 0x0F,
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(byte) 0x1A,
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(byte) 0x1D,
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(byte) 0x14,
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(byte) 0x13,
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(byte) 0xAE,
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(byte) 0xA9,
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(byte) 0xA0,
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(byte) 0xA7,
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(byte) 0xB2,
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(byte) 0xB5,
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(byte) 0xBC,
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(byte) 0xBB,
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(byte) 0x96,
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(byte) 0x91,
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(byte) 0x98,
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(byte) 0x9F,
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(byte) 0x8A,
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(byte) 0x8D,
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(byte) 0x84,
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(byte) 0x83,
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(byte) 0xDE,
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(byte) 0xD9,
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(byte) 0xD0,
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(byte) 0xD7,
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(byte) 0xC2,
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(byte) 0xC5,
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(byte) 0xCC,
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(byte) 0xCB,
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(byte) 0xE6,
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(byte) 0xE1,
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(byte) 0xE8,
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(byte) 0xEF,
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(byte) 0xFA,
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(byte) 0xFD,
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(byte) 0xF4,
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(byte) 0xF3
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};
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#endregion
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/// <summary>
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/// Update the CRC with the byte data.
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/// </summary>
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/// <param name="data">The byte data</param>
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/// <param name="crc">The starting CRC value</param>
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/// <returns>The updated CRC value</returns>
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public static byte Update(byte data, byte crc)
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{
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return Crc8Table[crc ^ data];
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}
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/// <summary>
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/// Update the CRC with the byte array data.
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/// </summary>
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/// <param name="data">The byte array data</param>
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/// <param name="len">The byte array length</param>
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/// <param name="crc">The starting CRC value</param>
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/// <returns>The updated CRC value</returns>
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public static byte UpdateBlock(byte[] data, int len, byte crc)
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{
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for (int i = 0; i < len; i++)
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crc = Crc8Table[crc ^ data[i]];
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return crc;
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}
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/// <summary>
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/// Calculate the CRC over a byte array.
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/// </summary>
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/// <param name="data">The byte data</param>
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/// <param name="len">The byte array length</param>
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/// <returns>The calculated CRC value</returns>
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public static byte Calculate(byte[] data, int len)
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{
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byte crc = 0;
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for (int i = 0; i < len; i++)
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crc = Crc8Table[crc ^ data[i]];
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return crc;
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}
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}
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}
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