js2png.php

<?php

/*
 * Author: Diego Perini
 *
 * this is what I have in my build system to embed
 * the packed version of NWMatcher in a PNG file;
 * actually any data like JSON or XML can be
 * transported in compressed PNG files and
 * avoids HTTP compression requirements.
 */

$filename = 'dist/nwmatcher-pac.js';

if (file_exists($filename)) {

  $size = filesize($filename);

  $width = ceil(sqrt($size / 1));
  $height = $width - 1;

  $im = imagecreate($width, $height);

  $fs = fopen($filename, 'r');
  $data = fread($fs, $size);
  fclose($fs);

  $i = 0;
  $colors = array();

  for ($y = 0; $height > $y; ++$y) {
    for ($x = 0; $width > $x; ++$x) {
      if ($i < $size) {
        $byte = ord($data[$i]);
        if (!isset($colors[$byte])) {
          $colors[$byte] = imagecolorallocate($im, $byte, $byte, $byte);
        }
        $color = $colors[$byte];
        imagesetpixel($im, $x, $y, $color);
        ++$i;
      }
    }
  }

  header('Content-Type: image/png');
  imagepng($im, NULL, 9);
  imagedestroy($im);
}
?>