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04/06/2008 at 02:02PM PDT, ID: 23299987
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8.6

I need a checksum calculation written in C converted to VB

Asked by CONTRACTOR4SITE in Microsoft Visual Basic.Net, C Programming Language, Miscellaneous Programming

I have been given some C code which calculates a checksum value for a Hex string. It looks like it could be a CRC-8 checksum, but I'm not positive. I need to create a VB version of this but I'm afraid I don't know C very well and the second function is confusing me. Can anyone help?

unsigned char crc_buff(unsigned char *p, unsigned char I)
{
      unsigned char x;
      unsigned char crc;
            crc = 0xff;
            for ( x = 0; x < I; x++)
                  crc = crc8( crc, *p++);
            return crc;
}
// ---
unsigned char crc8(unsigned char crc; unsigned char data)
{
unsigned char i;
      crc = crc ^ data;
      for (i=0; i<8; i++){
            if (crc & 0x01)
                  crc = (crc >> 1) ^ 0x8C
            else
                  crc >>= 1;
      }      
      return crc;
}

Any help would be appreciated by this newbie.

 
Keywords: I need a checksum calculation written i…
 
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Zones: Microsoft Visual Basic.Net, C Programming Language, Miscellaneous Programming
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Solution Provided By: PaulCaswell
Participating Experts: 3
Solution Grade: B
 
 
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