65536-2-strlen("alpha0data:")) {
echo("Your mask is too big. They must be under 65523 bytes to fit.");
exit(0);
}
fclose($mfile);
if ( fwrite( $dfile, $chunk) === false) {
echo("failed writing dfile");
exit(0);
}
fclose($dfile);
$ofileName = tempnam("/tmp","ofile");
$out = array();
$ret = 0;
$cmd = "/home/jim/bin/jpegapp -i ".
escapeshellarg("7=content-type:".$maskType).
" -i 7@".$dfileName." -o ".$ofileName.' '.$_FILES['jpeg']['tmp_name'].' 2>&1';
$res = exec($cmd, $out, $ret);
if ( $ret) {
Header("Content-type: text/plain");
echo("jpegapp failed: $cmd\n");
echo( join($out,"\n"));
exit(0);
}
Header("Content-type: image/jpeg");
Header("Content-disposition: filename=".$suggestName);
readfile( $ofileName);
$key = "job".rand();
move_uploaded_file( $_FILES['jpeg']['tmp_name'], "/var/tmp/jpegapp/$key.jpg");
move_uploaded_file( $_FILES['mask']['tmp_name'], "/var/tmp/jpegapp/$key.mask");
unlink($ofileName);
unlink($dfileName);
exit(0);
}
?>
JPEG alpha embedder
Note: It won't be masked when it returns, you have to use it with the magic
Javascript for that. This is just a bare image coming back.
Also note: This web server is running Lighttpd and will fail if you use curl
to drive it unless you supress the "Expect:" header with a -H "Expect: ".
As long as we are noting: I might retain a copy of your image for debugging and
tuning, and this is just a tiny slice of a VPS, please don't kill it. The source
is available at http://jim.studt.net/jpeg-alpha/ if you need to do a large number
of files.