i386/standford/2004/src/lab3/boot/sign.pl

   1 #!/bin/perl
   2
   3 open(SIG, $ARGV[0]) || die "open $ARGV[0]: $!";
   4
   5 $n = sysread(SIG, $buf, 1000);
   6
   7 if($n > 510){
   8         print STDERR "boot block too large: $n bytes (max 510)\n";
   9         exit 1;
  10 }
  11
  12 print STDERR "boot block is $n bytes (max 510)\n";
  13
  14 $buf .= "\0" x (510-$n);
  15 $buf .= "\x55\xAA";
  16
  17 open(SIG, ">$ARGV[0]") || die "open >$ARGV[0]: $!";
  18 print SIG $buf;
  19 close SIG;