<?php
 
/**
  * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/)
  * Copyright (C) 2002-2004 The Nucleus Group
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  * (see nucleus/documentation/index.html#license for more info)
  *
  * NP_GZip is a plugin which compresses the pages that Nucleus sends to
  * the client using GZip compression, saving bandwidth.
  *
  * Revision History:
  *      2.1    Yaroslav 'MOSSs' Sotnikov
  *         - Plugin now works with latest Nucleus version (ie: 3.22)
  *           Test your page Gzip status here: http://www.desilva.biz/gzip-test.php
  *
  *      2.0      Wouter Demuynck (2003-12-28)
  *         - Added ob_end_flush call on PostSkinParse event
  *         - Only starting obgzhandler when no output buffering is active
  *           (fixes problems with xml-rss*.php)
  *      1.0      Wouter Demuynck
  *         - Initial implementation
  *         
  */
 
 
class NP_GZip extends NucleusPlugin {
 
    function supportsFeature($name)
    {
        switch($name) {
        case 'SqlTablePrefix':
            return true;
        }
        return false;
    }
 
   function getMinNucleusVersion()   {
      return 155;
   }
 
   // name of plugin
   function getName() {
      return 'gzip encoding';
   }
 
   // author of plugin
   function getAuthor()  {
      return 'Wouter Demuynck';
   }
 
   // an URL to the plugin website
   // can also be of the form mailto:foo@bar.com
   function getURL() {
      return 'http://nucleuscms.org/';
   }
 
   // version of the plugin
   function getVersion() {
      return '2.1';
   }
 
   // a description to be shown on the installed plugins listing
   function getDescription() {
      return 'Compresses the pages generated by Nucleus using gzip compression, if the requesting browser accepts this. This saves bandwidth. Works with latest Nuleus version (MOSSs)!';
   }
 
   function getEventList() {
      return array('PreSkinParse', 'PostSkinParse');
   }
 
   function init() {
      $this->obStarted = 0;
   }
 
   function event_PreSkinParse(&$data) {
      $bStart = 1;
 
      // don't start output buffering if we're not at the top level
      // (fixes problems with RSS feeds & ETAG)
      if (function_exists('ob_get_level') && (ob_get_level() > 0))
         $bStart = 0;
      if ($bStart)
         $this->obStarted = ob_start("ob_gzhandler");
   }
 
   function event_PostSkinParse(&$data) {
      if ($this->obStarted)
         ob_end_flush();
   }   
}
?>