/src/lib/handlers/output_handler.php

<?php
/**
 * Output handler
 * Output handler with compression features.
 * ---
 * Written by Jose Carlos Nieto <xiam@menteslibres.org>
 * Copyright (c) 2007 Astrata Software S.A. de C.V.
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @author          Jose Carlos Nieto <xiam@menteslibres.org>
 * @copyright       Copyright (c) 2007-2008, Astrata Software S.A. de C.V.
 * @link            http://opensource.astrata.com.mx Astrata Open Source Projects
 * @version         $Revision: $
 * @modifiedby      $LastChangedBy: $
 * @lastmodified    $Date: $
 * @license         http://www.opensource.org/licenses/mit-license.php The MIT License
 *
 */

class output_handler extends tm_object {
  
  public $html_compression = false;
  
  private $gzoutput = false;

  public function __construct(&$params = null) {
    parent::__construct($params);
    if (TM_GZIP_COMPRESSION && extension_loaded('zlib') && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && ereg('(gzip)', $_SERVER['HTTP_ACCEPT_ENCODING'])) {
      $this->gzoutput = true;
      ob_start('ob_gzhandler');
    } else {
      ob_start();
    }
    $this->html_compression = TM_COMPACT_SOURCE;
  }

  public function __destruct() {

    $buff = ob_get_clean();

    if ($this->html_compression && !defined('TM_AJAX') && !defined('TM_NO_DEBUG')) {
      $buff = preg_replace('/>[\s\r\n\t\f]+/m', '> ', $buff);
      $buff = preg_replace('/[\s\r\n\t\f]+</m', ' <', $buff);
      // TODO skip comments inside scripts, like adsense stuff
      //$buff = preg_replace('/<!--.*?-->/ms', '', $buff);
      $buff .= "\n<!-- Proudly powered by Textmotion.ORG (compression enabled) -->";
    }

    if ($this->gzoutput) {
      $size = strlen($buff);
      header('Content-Encoding: gzip');
      header('Vary: Accept-Encoding');
      
      $crc = crc32($buff);
      $buff = "\x1f\x8b\x08\x00\x00\x00\x00\x00".substr(gzcompress($buff, 9), 0, -4);
      $buff .= pack('V', $crc);
      $buff .= pack('V', $size);
    }

    header('Content-Length: '.strlen($buff).'');

    echo $buff;
  }

  public function run_test() {
    $output = new output_handler();
    echo str_repeat("A", 500);
  }
}
//output_handler::run_test();
?>