需要CRC编程帮助，将CRC32从。NET类转换为C类

Question

代码（用C编写）：

unsigned long chksum_crc32 (unsigned char *block, unsigned int length)
{
   register unsigned long crc;
   unsigned long i;

   crc = 0xFFFFFFFF;
   for (i = 0; i < length; i++)
   {
      crc = ((crc >> 8) & 0x00FFFFFF) ^ crc_tab[(crc ^ *block++) & 0xFF];
   }
   return (crc ^ 0xFFFFFFFF);
}


/* chksum_crc32gentab() --      to a global crc_tab[256], this one will
 *              calculate the crcTable for crc32-checksums.
 *              it is generated to the polynom [..]
 */

void chksum_crc32gentab ()
{
   unsigned long crc, poly;
   int i, j;

   poly = 0xEDB88320L;
   for (i = 0; i < 256; i++)
   {
      crc = i;
      for (j = 8; j > 0; j--)
      {
         if (crc & 1)
         {
            crc = (crc >> 1) ^ poly;
         }
         else
         {
            crc >>= 1;
         }
      }
      crc_tab[i] = crc;
   }
}

      MemoryStream ms = new MemoryStream(System.Text.Encoding.Default.GetBytes(input));

            foreach (byte b in crc32.ComputeHash(ms))
                hash += b.ToString("x2").ToLower();

这里是原始网站和项目的C代码是从。http://www.codeproject.com/articles/35134/how-to-calculation-crc-in-c

任何解释都有帮助

Answer 1

或者只是谷歌一下...第二点击:http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/libkern/crc32.c

从C#中回传它是很难做到的，这些算法中的大多数已经在C中实现了。