C语言CRC校验代码转C# 谢谢！

Question

static const ushort table[256]={...};//照抄
ushort CRC(ushort crc,byte theByte)
{
    return (ushort)((crc >> 8 ) ^ tabel[(crc ^ (uint) (theByte)) & 0XFF]) ;
}ushort CalcCRC(byte[] data,int size)
{
    int i;
    ushort crc=0;
    for(i=0;i<size;i++)
    {
         crc=CRC(crc,data[i]);
    }
    return crc;
}

Answer 1

不好意思，申明数组跟C有点混起来了
这样申明：static const ushort [] table=new ushort[256]{...}; 

Answer 2

转换一下算法就可以了，我这里C、C#、VB、Delphi的都有

Answer 3

 public class CrcITUTable
    {
        static ushort[] crctab16 = 
        {
            0X0000, 0X1189, 0X2312, 0X329B, 0X4624, 0X57AD, 0X6536, 0X74BF,
            0X8C48, 0X9DC1, 0XAF5A, 0XBED3, 0XCA6C, 0XDBE5, 0XE97E, 0XF8F7,
            0X1081, 0X0108, 0X3393, 0X221A, 0X56A5, 0X472C, 0X75B7, 0X643E,
            0X9CC9, 0X8D40, 0XBFDB, 0XAE52, 0XDAED, 0XCB64, 0XF9FF, 0XE876,
            0X2102, 0X308B, 0X0210, 0X1399, 0X6726, 0X76AF, 0X4434, 0X55BD,
            0XAD4A, 0XBCC3, 0X8E58, 0X9FD1, 0XEB6E, 0XFAE7, 0XC87C, 0XD9F5,
            0X3183, 0X200A, 0X1291, 0X0318, 0X77A7, 0X662E, 0X54B5, 0X453C,
            0XBDCB, 0XAC42, 0X9ED9, 0X8F50, 0XFBEF, 0XEA66, 0XD8FD, 0XC974,
            0X4204, 0X538D, 0X6116, 0X709F, 0X0420, 0X15A9, 0X2732, 0X36BB,
            0XCE4C, 0XDFC5, 0XED5E, 0XFCD7, 0X8868, 0X99E1, 0XAB7A, 0XBAF3,
            0X5285, 0X430C, 0X7197, 0X601E, 0X14A1, 0X0528, 0X37B3, 0X263A,
            0XDECD, 0XCF44, 0XFDDF, 0XEC56, 0X98E9, 0X8960, 0XBBFB, 0XAA72,
            0X6306, 0X728F, 0X4014, 0X519D, 0X2522, 0X34AB, 0X0630, 0X17B9,
            0XEF4E, 0XFEC7, 0XCC5C, 0XDDD5, 0XA96A, 0XB8E3, 0X8A78, 0X9BF1,
            0X7387, 0X620E, 0X5095, 0X411C, 0X35A3, 0X242A, 0X16B1, 0X0738,
            0XFFCF, 0XEE46, 0XDCDD, 0XCD54, 0XB9EB, 0XA862, 0X9AF9, 0X8B70,
            0X8408, 0X9581, 0XA71A, 0XB693, 0XC22C, 0XD3A5, 0XE13E, 0XF0B7,
            0X0840, 0X19C9, 0X2B52, 0X3ADB, 0X4E64, 0X5FED, 0X6D76, 0X7CFF,
            0X9489, 0X8500, 0XB79B, 0XA612, 0XD2AD, 0XC324, 0XF1BF, 0XE036,
            0X18C1, 0X0948, 0X3BD3, 0X2A5A, 0X5EE5, 0X4F6C, 0X7DF7, 0X6C7E,
            0XA50A, 0XB483, 0X8618, 0X9791, 0XE32E, 0XF2A7, 0XC03C, 0XD1B5,
            0X2942, 0X38CB, 0X0A50, 0X1BD9, 0X6F66, 0X7EEF, 0X4C74, 0X5DFD,
            0XB58B, 0XA402, 0X9699, 0X8710, 0XF3AF, 0XE226, 0XD0BD, 0XC134,
            0X39C3, 0X284A, 0X1AD1, 0X0B58, 0X7FE7, 0X6E6E, 0X5CF5, 0X4D7C,
            0XC60C, 0XD785, 0XE51E, 0XF497, 0X8028, 0X91A1, 0XA33A, 0XB2B3,
            0X4A44, 0X5BCD, 0X6956, 0X78DF, 0X0C60, 0X1DE9, 0X2F72, 0X3EFB,
            0XD68D, 0XC704, 0XF59F, 0XE416, 0X90A9, 0X8120, 0XB3BB, 0XA232,
            0X5AC5, 0X4B4C, 0X79D7, 0X685E, 0X1CE1, 0X0D68, 0X3FF3, 0X2E7A,
            0XE70E, 0XF687, 0XC41C, 0XD595, 0XA12A, 0XB0A3, 0X8238, 0X93B1,
            0X6B46, 0X7ACF, 0X4854, 0X59DD, 0X2D62, 0X3CEB, 0X0E70, 0X1FF9,
            0XF78F, 0XE606, 0XD49D, 0XC514, 0XB1AB, 0XA022, 0X92B9, 0X8330,
            0X7BC7, 0X6A4E, 0X58D5, 0X495C, 0X3DE3, 0X2C6A, 0X1EF1, 0X0F78,
       };        public CrcITUTable()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        /// <summary>
        /// 返回校验CRC-ITU
        /// </summary>
        /// <param name="pData">指针</param>
        /// <param name="nLength">指针偏移位数</param>
        /// <param name="crcCode"></param>
        /// <returns></returns>
        unsafe public static ushort GetCrcITU_T(byte* pData, int nLength, out string crcCode)
        {
            ushort fcs = 0xFFFF;
            ushort uRlt;
            string strTmp;
            while (nLength > 0)
            {
                fcs = (ushort)((ushort)(fcs >> 8) ^ crctab16[(fcs ^ *pData) & 0xFF]);
                nLength--;
                pData++;
            }            uRlt = (ushort)~fcs;
            strTmp = uRlt.ToString("X4");
            crcCode = strTmp.Substring(0, 2) + strTmp.Substring(2, 2);            return uRlt;
        }
        /// <summary>
        /// 验证CRC-ITU
        /// </summary>
        /// <param name="pData"></param>
        /// <param name="nLength"></param>
        /// <returns></returns>
        unsafe public bool IsCrcITUGood_T(byte* pData, int nLength)
        {
            ushort fcs = 0xFFFF;
            while (nLength > 0)
            {
                fcs = (ushort)((ushort)(fcs >> 8) ^ crctab16[(fcs ^ *pData) & 0xFF]);
                nLength--;
                pData++;
            }            return (fcs == 0xF0B8);
        }    }

Answer 4

使用        /// <summary>
        /// CRC 校验，返回校验结果
        /// </summary>
        /// <param name="STR_CRC">需校验的值</param>
        /// <param name="STR_CON">对比值</param>
        /// <returns></returns>
        unsafe public static bool IsPassCRC_ITU(string STR_CRC,string STR_CON)
        {
            //在进一步操作之前先验证数据的正确性(CRC-ITU)
            //login ex:   78 78 0D 01 0868120106956821 0008 2624 0D0A    0D0108681201069568210008 CRC-ITU=> 2624
            //gps/lbs ex: 78 78 1F120D07160F2B34CB026AFDA40C38D38000140001CC00263800111D001F 916B 0D0A            //YELLOW 2013/07/24  需要校验的数据每个不同，需区别对待            byte[] buffer = Pub.strToToHexByte(STR_CRC);            fixed (byte* btSrc = buffer)
            {
                CrcITUTable.GetCrcITU_T(btSrc, buffer.Length, out Crc);
            }            if (Crc == STR_CON)
            {
                return true;
            }
            return false;
        }
        /// <summary>
        /// CRC验证结果
        /// </summary>
        /// <param name="STR_SRC"></param>
        /// <returns></returns>
        unsafe public static string RET_CRC_VALUE(string STR_SRC)
        {
            //"0501" + src.Substring(20, 4)
            byte[] buffer = Pub.strToToHexByte(STR_SRC);            fixed (byte* btSrc = buffer)
            {
                CrcITUTable.GetCrcITU_T(btSrc, buffer.Length, out Crc);
            }
            return Crc;
        }

Answer 5

因用到了指针，所以需要工程设置成允许unsafe编译。
有问题再问。