通信协议 CRC校验和计算方法

来源：互联网发布：centos安装pptp 编辑：程序博客网时间：2024/05/29 17:38
 public static uint CalCrc16(byte[] buf, int start, int end)        {            byte CRC16Lo, CRC16Hi;   //CRC寄存器            byte CL, CH;             //多项式码&HA001            byte SaveLo, SaveHi;            int i, Flag;            CRC16Hi = 0xFF;            CRC16Lo = 0xFF;            CL = 0x1;            CH = 0xA0;            for (i = start; i <= end; i++)            {                CRC16Lo = (byte)(CRC16Lo ^ buf[i]); //每一个数据与CRC寄存器进行异或                for (Flag = 0; Flag <= 7; Flag++)                {                    SaveHi = CRC16Hi;                    SaveLo = CRC16Lo;                    CRC16Hi = (byte)(CRC16Hi / 2);             //高位右移一位                    CRC16Lo = (byte)(CRC16Lo / 2);             //低位右移一位                    if ((SaveHi & 0x1) == 0x1)                    {                        CRC16Lo = (byte)(CRC16Lo | 0x80);                    }                    if ((SaveLo & 0x1) == 0x1)                    {                        CRC16Hi = (byte)(CRC16Hi ^ CH);                        CRC16Lo = (byte)(CRC16Lo ^ CL);                    }                }            }            return (uint)CRC16Hi * 256 + CRC16Lo;        }