This works for me, hope its some help to you.

  open (OUTPUT,">$outfile") || die "Cannot open image file: $!";

  binmode(OUTPUT);
  my $buffer;
  while (my $bytesread = read($filename_thumbnail, $buffer, 4096)) {
    my $length += $bytesread;
    print OUTPUT $buffer || die "Cannot write the image to file: $!";
  }
  close OUTPUT || die "Cannot close image file: $!";

  my $koko = int(($length+512)/1024);

  my $maxsize="1024";

  if($koko > $maxsize && $maxsize > 0) {
    unlink "$outfile";
    print "File size is limited to ". $maxsize ."KB<br>$koko";
  }
[download]

Then the form should look like this

<form name="additem" method="post" action="$ENV{'SCRIPT_NAME'} enctype
+="multipart/form-data">
<input type="file" name="outfile" size="10" class="submit">
<input type="submit">
</form>
[download]

I kinda missed out some usual CGI and perl bits there, but I hope that's some help to you.

Cheers,
Tom