C++产生CRC 对照码源代码

我这里有应该是C++的但要怎样转成c#的

const u16 FCS_START = 0xffff; 

const u16 FCS_FINAL = 0xf0b8; 

const u16 FCSTAB[256] = {
     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
};

/*

*****************************************************************************
*

  * 功能描述：产生CRC 对照码

  * 输入参数: fcs:  前次crc16 的代码

                src: 本次参加运算的数据，单字节

  * 输出参数:  无

  * 返回值:       CRC 对照码

*****************************************************************************
*
  */
u16 GetFcs(u16 fcs, u8 src)
{
  u16 xor = 0;
  u16 iresult = 0;

  xor = fcs;
  xor ^= src;

     iresult = (((fcs) >> 8) ^ FCSTAB[xor & 0x00ff]);

  return iresult;
}

/*

*****************************************************************************
*

  * 功能描述：CRC 校验

  * 输入参数: psrc:  待校验的数据

                ilen: 数据长度

  * 输出参数:  无

  * 返回值:        0:  成功

CB680-C1001    Rev. 2.00                                                                                                

       -1: 失败

*****************************************************************************
*
  */
s16 CRC_CheckCrc(u8 *psrc, u16 ilen)
{
  u16 crc = 0;
  s16 iresult = 0;;

  crc = FCS_START;

  while(ilen-- != 0)
  {
   crc = GetFcs(crc,*psrc);
   psrc++;
  }

     if (FCS_FINAL != crc)
     {
           iresult = -1;
     }
     else
     {
           iresult = 0;
     }
  return iresult;
}

/*

*****************************************************************************
*

  * 功能描述：产生CRC 校验码

  * 输入参数: psrc:  待校验的数据缓冲区指针

                  ilen: 数据长度

  * 输出参数:  无

  * 返回值:        校验码                                                                          

*****************************************************************************
*
   */
u16 CRC_MakeCrc(u8 * psrc, u16 ilen)
{
   u16 crc = 0;

   crc = FCS_START;

   while(ilen-- > 0)
   {
            crc = GetFcs(crc,*psrc++);
   }

   crc ^= FCS_START;

   return crc;
} 

hi can you converted this function in php