源于
CRC 校验算法C#实现一 ——接口实现
CRC
校验有
CRC 8
位
16
位
32
位
所以在实现这些校验算发之前，先实现它们的接口！
using System;
namespace CRC { public interface ICRC { long Value { get; } void Reset(); void Crc(int bval); void Crc(byte[] buffer); void Crc(byte[] buf, int off, int len);
} }
CRC 校验算法C#实现三 ——16位校验算法
using System;
namespace CRC { /// <summary> /// CRC16
的摘要说明。
/// </summary> public class CRC16:ICRC { #region CRC 16
位校验表
/// <summary> /// 16
位校验表
Upper
表
/// </summary> public ushort[] uppercrctab = new ushort[] { 0x0000,0x1231,0x2462,0x3653,0x48c4,0x5af5,0x6ca6,0x7e97, 0x9188,0x83b9,0xb5ea,0xa7db,0xd94c,0xcb7d,0xfd2e,0xef1f };
/// <summary> /// 16
位校验表
Lower
表
/// </summary> public ushort[] lowercrctab = new ushort[] { 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef }; #endregion
ushort crc = 0;
/// <summary> ///
校验后的结果
/// </summary> public long Value { get { return crc; } set { crc = (ushort)value; } }
/// <summary> ///
设置
crc
初始值
/// </summary> public void Reset() { crc = 0; } /// <summary> /// Crc16 /// </summary> /// <param name="ucrc"></param> /// <param name="buf"></param> public void Crc(ushort ucrc,byte[] buf) { crc = ucrc; Crc(buf); } /// <summary> /// Crc16 /// </summary> /// <param name="bval"></param> public void Crc(int bval) { ushort h = (ushort)((crc >> 12) & 0x0f); ushort l = (ushort)((crc >> 8 ) & 0x0f); ushort temp = crc; temp =(ushort)(((temp & 0x00ff) << 8) | bval); temp =(ushort)(temp ^(uppercrctab[(h -1) + 1] ^ lowercrctab[(l - 1) + 1])); crc = temp; }
/// <summary> /// Crc16 /// </summary> /// <param name="buffer"></param> public void Crc(byte[] buffer) { Crc(buffer,0,buffer.Length); }
/// <summary> /// Crc16 /// </summary> /// <param name="buf"></param> /// <param name="off"></param> /// <param name="len"></param> public void Crc(byte[] buf,int off,int len) { if (buf == null) { throw new ArgumentNullException("buf"); } if (off < 0 || len < 0 || off + len > buf.Length) { throw new ArgumentOutOfRangeException(); } for (int i = off; i < len ; i ++) { Crc(buf[i]); } }
} }
调用CRC16 的一个例子
CRC16 crc =
new
CRC16(); crc.Reset(); crc.Crc(buf,0,DataPack.NextPackDataByteCount - 2); crc.Crc(0); crc.Crc(0); buf[DataPack.NextPackDataByteCount - 2] = (
byte
)((crc.Value >> 8) & 0xff); buf[DataPack.NextPackDataByteCount - 1] = (
byte
)((crc.Value & 0xff));
FLOAT_HEX HEX_FLOAT
float vDouble =77.79F; Text = BitConverter.ToString(BitConverter.GetBytes(vDouble)).Replace("-", " ");
string m=Text.Replace(" ", "");//如果中间有空格
int len = m.Length/2;
byte[] arr = new byte[len]; for(int i=0;i<len;i++) { arr[i] = Convert.ToByte(m.Substring(i*2,2),16); } float f1 = BitConverter.ToSingle(arr,0);
