Calculate a one byte LRC checksum character using XOR

unsigned char checksum(unsigned char *buf, int len)

{

int                   i;

unsigned char         checksum = 0x00;

unsigned char         *ptr = (unsigned char *) buf;



    /* calculate the XOR value for each byte */



    for (i=0; i < len;  i++)

       checksum = checksum ^ ptr[i];



    return (unsigned char) checksum;

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