CRC算法C#实现

原文地址：

接口实现：http://www.cnblogs.com/canny/archive/2004/12/27/82466.aspx

CRC8：http://www.cnblogs.com/canny/archive/2004/12/27/82468.aspx

CRC16：http://www.cnblogs.com/canny/archive/2004/12/27/82470.aspx

CRC32：http://www.cnblogs.com/canny/archive/2004/12/27/82473.aspx

1.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！

2. CRC8
 

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); 

 } 

代码 
using System;

namespace CRC 
...{ 
 /**//// <summary> 
 /// CRC8 的摘要说明。 
 /// </summary> 
 public class CRC8:ICRC 
 ...{ 
  CRC 8 位校验表#region CRC 8 位校验表 

  /**//// <summary> 
  /// CRC 8 位校验表 
  /// </summary> 
  public  byte[] CRC8_Table = new byte[] 
  ...{ 
   0,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65, 
   157,195,33,127,252,162,64,30, 95,1,227,189,62,96,130,220, 
   35,125,159,193,66,28,254,160,225,191,93,3,128,222,60,98, 
   190,224,2,92,223,129,99,61,124,34,192,158,29,67,161,255, 
   70,24,250,164,39,121,155,197,132,218,56,102,229,187,89,7,             
   219,133,103,57,186,228,6,88,25,71,165,251,120,38,196,154, 
   101,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,                         
   248,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,             
   140,210,48,110,237,179,81,15,78,16,242,172,47,113,147,205, 
   17,79,173,243,112,46,204,146,211,141,111,49,178,236,14,80, 
   175,241,19,77,206,144,114,44,109,51,209,143,12,82,176,238, 
   50,108,142,208,83,13,239,177,240,174,76,18,145,207,45,115, 
   202,148,118,40,171,245,23,73,8,86,180,234,105,55,213,139, 
   87,9,235,181,54,104,138,212,149,203, 41,119,244,170,72,22, 
   233,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168, 
   116,42,200,150,21,75,169,247,182,232,10,84,215,137,107,53 
  }; 
  #endregion 

  uint crc = 0; 
   
  /**//// <summary> 
  ///返回 CRC8校验结果; 
  /// </summary> 
  public long Value 
  ...{ 
   get 
   ...{ 
    return crc; 
   } 
   set 
   ...{ 
    crc = (uint)value; 
   } 
  } 


  /**//// <summary> 
  /// CRC校验前设置校验值 
  /// </summary> 
  public void Reset() 
  ...{ 
   crc = 0; 
  } 

  /**//// <summary> 
  /// 8 位 CRC 校验 产生校验码 需要被校验码和校验码 
  /// </summary> 
  /// <param name="CRC"></param> 
  /// <param name="OldCRC"> 初始为 0 ,以后为 返回值 ret </param> 
  /// <returns> 产生校验码时 ret　为校验码</returns> 
   
  public void Crc(byte CRC,byte OldCRC) 
  ...{ 
   crc = CRC8_Table[OldCRC ^ CRC]; 
  } 

  /**//// <summary> 
  /// 8 位 CRC 校验 产生校验码 只要被校验码 
  /// </summary> 
  /// <param name="bval"></param> 
  public void Crc(int bval) 
  ...{ 
   crc = CRC8_Table[crc ^ bval]; 
  } 

  /**//// <summary> 
  /// 8 位 CRC 校验 产生校验码 只要被校验的字节数组 
  /// </summary> 
  /// <param name="buffer"></param> 
  public void Crc(byte[] buffer) 
  ...{ 

   Crc(buffer,0,buffer.Length); 
  } 

  /**//// <summary> 
  /// 8 位 CRC 校验 产生校验码 要被校验的字节数组、起始结果位置和字节长度 
  /// </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]); 
   } 
  } 
 } 
} 




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} 

3.CRC16