Just found this tidbit: http://skolk.livejournal.com/ -hpa
Hello!
Why you don't check the SDI header checksum?
May be my explanation isn't clear enough?
http://skolk.livejournal.com/886.html
do {
unsigned char checksum=0;
const unsigned char *cptr=ptr;
int i=0x200; /* 512 */
#if 1 /* choose for your style ;) */
do {
checksum += *cptr++;
} while (--i);
#else
for (i=0;i<512;i++) checksum += cptr[i];
#endif
if (checksum != 0 ) {
fputs("Bad header checksum for SDI file\n", stdout);
goto bail;
}
} while (0);
Sergii