几种CRC16算法

原文地址::http://blog.csdn.net/lluct/article/details/2617967

相关网帖

1、CRC16算法分析(资料）----http://wenku.baidu.com/link?url=cmO4BkdiAd6vneW8aMFx159BBeTOs33LCiuilaUxddTHkQonRL3ae9PYQCw9vYEwfl90UYi_wpX3Pay1YIsA9JNWaZ40Kf89IWOnBB81w03

2、CRC16/CRC32/CRC16F算法和代码 ----http://bbs.chinaunix.net/thread-239630-1-1.html

3、CRC百度百科----http://baike.baidu.com/view/80377.htm#2

一. CRC16算法

首先在源文件头文件加入表值:

 //
 // CRC16码表
 static WORD const wCRC16Table[256] = {
     0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
     0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
     0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
     0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
     0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
     0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
     0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
     0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
     0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
     0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
     0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
     0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
     0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
     0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
     0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
     0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
     0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
     0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
     0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
     0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
     0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
     0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
     0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
     0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
     0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
     0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
     0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
     0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
     0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
     0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
     0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
     0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040};

然后在文件中加入下列函数:

 //
 // 函数功能: CRC16效验
 // 输入参数: pDataIn: 数据地址
 //           iLenIn: 数据长度
 // 输出参数: pCRCOut: 2字节校验值
 void CCRCDlg::CRC16(const CHAR* pDataIn, int iLenIn, WORD* pCRCOut)
 {
     WORD wResult = 0;
     WORD wTableNo = 0;

     for(int i = 0; i < iLenIn; i++)
     {
         wTableNo = ((wResult & 0xff) ^ (pDataIn[i] & 0xff));
         wResult = ((wResult >> 8) & 0xff) ^ wCRC16Table[wTableNo];
     }

     *pCRCOut = wResult;
 }

二.CRC16(MODBUS)

 //
 // CRC MODBUS 效验
 // 输入参数: pDataIn: 数据地址
 //           iLenIn: 数据长度
 // 输出参数: pCRCOut: 2字节校验值
 void CCRCDlg::CheckCRCModBus(const CHAR* pDataIn, int iLenIn, WORD* pCRCOut)
 {
     WORD wHi = 0;
     WORD wLo = 0;
     WORD wCRC;
     wCRC = 0xFFFF;

     for (int i = 0; i < iLenIn; i++)
     {
         wCRC = CalcCRCModBus(*pDataIn, wCRC);
         pDataIn++;
     }

     wHi = wCRC / 256;
     wLo = wCRC % 256;
     wCRC = (wHi << 8) | wLo;

     *pCRCOut = wCRC;
 }

 WORD CCRCDlg::CalcCRCModBus(CHAR cDataIn, WORD wCRCIn)
 {
     WORD wCheck = 0;
     wCRCIn = wCRCIn ^ cDataIn;

     for(int i = 0; i < 8; i++)
     {
         wCheck = wCRCIn & 1;
         wCRCIn = wCRCIn >> 1;
         wCRCIn = wCRCIn & 0x7fff;

         if(wCheck == 1)
         {
             wCRCIn = wCRCIn ^ 0xa001;
         }
         wCRCIn = wCRCIn & 0xffff;
     }

     return wCRCIn;
 }

三.CRC16(CCITT的0XFFFF)

 //
 // 函数功能: CRC16效验(CCITT的0XFFFF效验)
 // 输入参数: pDataIn: 数据地址
 //           iLenIn: 数据长度
 // 输出参数: pCRCOut: 2字节校验值
 void CCRCDlg::CRCCCITT(const CHAR* pDataIn, int iLenIn, WORD* pCRCOut)
 {
     WORD wTemp = 0;
     WORD wCRC = 0xffff;

     for(int i = 0; i < iLenIn; i++)
     {
         for(int j = 0; j < 8; j++)
         {
             wTemp = ((pDataIn[i] << j) & 0x80 ) ^ ((wCRC & 0x8000) >> 8);

             wCRC <<= 1;

             if(wTemp != 0)
             {
                 wCRC ^= 0x1021;
             }
         }
     }

     *pCRCOut = wCRC;
 }