C# CRC16 查表法

?

private static ushort[] crctab = new ushort[256]{
??????????????????? 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
??????????????????? 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
??????????????????? 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
??????????????????? 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
??????????????????? 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
??????????????????? 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
??????????????????? 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
??????????????????? 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
??????????????????? 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
??????????????????? 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
??????????????????? 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
??????????????????? 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
??????????????????? 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
??????????????????? 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
??????????????????? 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
??????????????????? 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
??????????????????? 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
??????????????????? 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
??????????????????? 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
??????????????????? 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
??????????????????? 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
??????????????????? 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
??????????????????? 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
??????????????????? 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
??????????????????? 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
??????????????????? 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
??????????????????? 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
??????????????????? 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
??????????????????? 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
??????????????????? 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
??????????????????? 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
??????????????????? 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
??????????????????? };

/// <summary>
??????? /// CRC校驗公式
??????? /// </summary>
??????? /// <param name="crc">CRC</param>
??????? /// <param name="cp">發送的數據序列</param>
??????? /// <returns>新CRC</returns>
??????? private static ushort xcrc(ushort crc, byte cp)
??????? {
??????????? ushort t1 = 0, t2 = 0, t3 = 0, t4 = 0, t5 = 0, t6 = 0;
??????????? t1 = (ushort)(crc >> 8);
??????????? t2 = (ushort)(t1 & 0xff);
??????????? t3 = (ushort)(cp & 0xff);
??????????? t4 = (ushort)(crc << 8);
??????????? t5 = (ushort)(t2 ^ t3);
??????????? t6 = (ushort)(crctab[t5] ^ t4);
??????????? return t6;
??????? }

/// <summary>
??????? /// 添加CRC校驗字
??????? /// </summary>
??????? /// <param name="bufin">信息串</param>
??????? /// <param name="n">不包括校驗字的串總長度</param>
??????? public static void ConCRC(byte[] bufin, int n)
??????? {
??????????? ushort crc16 = 0;
??????????? byte i;
??????????? //n個數據的CRC校驗
??????????? for (i = 5; i < n; i++)
??????????? {
??????????????? crc16 = xcrc(crc16, bufin[i]);
??????????? }
??????????? byte[] temp = new byte[2];
??????????? temp[0] = (byte)(crc16 >> 8);
??????????? temp[1] = (byte)(crc16 & 0xff);
??????????? bufin[i] = (byte)(crc16 >> 8);
??????????? bufin[i + 1] = (byte)(crc16 & 0xff);
??????? }

/// <summary>
??????? /// CRC數據驗證
??????? /// </summary>
??????? /// <param name="bufout">信息串</param>
??????? /// <param name="count">接收數據總長度</param>
??????? /// <returns>true:校驗成功,false:校驗失敗</returns>
??????? public static bool DataCRC(ref byte[] bufout, byte count)
??????? {
??????????? ushort crc16 = 0;
??????????? byte i;
??????????? for (i = 0; i < (count - 2); i++)
??????????????? crc16 = xcrc(crc16, bufout[i]);

??????????? if ((bufout[count - 2] == (byte)(crc16 >> 8)) && (bufout[count - 1] == (byte)(crc16 & 0xff)))
??????????? {
??????????????? return true;
??????????? }
??????????? else
??????????? {
??????????????? return false;
??????????? }
??????? }

轉載于:https://www.cnblogs.com/FLWL/p/3606926.html

總結

以上是生活随笔為你收集整理的C#编程中的crc16校验的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。