#! /usr/bin/perl

use autodie;

sub intify ($) {
  my ($n) = @_;
  if ($n =~ /^0/) { $n = oct $n; }
  return $n;
}

sub frame ($$) {
  my ($flag, $d) = @_;
  my $a = $flag;
  for (my $i = 0; $i < length $d; $i++) { $a ^= ord substr $d, $i, 1; }
  return pack("S< C", 2 + length $d, $flag) . $d . chr($a);
}

@ARGV == 4 or die "usage: $0 TY NAME P1 P2";
my ($ty, $name, $p1, $p2) = @ARGV;

my $body = "";
READ: for (;;) {
  sysread STDIN, my $buf, 4096;
  last READ unless length $buf;
  $body .= $buf;
}

my $tap = "";
$tap .= frame 0, pack "C A10 S< S< S<",
  $ty, $name, length $body, intify $p1, intify $p2;
$tap .= frame 255, $body;

syswrite STDOUT, $tap;