/forum/web-optimizer/controller/compressor.php

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<?php
/**
 * File from WEBO Site SpeedUp, WEBO Software (http://www.webogroup.com/)
 * Gzips and minifies the JavaScript and CSS within the head tags of a page.
 * Can also gzip and minify the page itself
 * and 100+ other cool web performance optimization techniques
 * Based on Web Optimizer, which was based on PHP Speedy
 *
 **/
class web_optimizer {

	/**
	* Constructor
	* Sets the options and defines the gzip headers
	**/
	function web_optimizer ($options = false) {
/* initialize chained optimization */
		if(!empty($_GET['web_optimizer_disabled']))
		{
			$this->options['active'] = 0;
			return;
		}
		$this->web_optimizer_stage = round(empty($_GET['web_optimizer_stage']) ? 0 : $_GET['web_optimizer_stage']);
		$this->debug_mode = empty($_GET['web_optimizer_debug']) && empty($_COOKIE['web_optimizer_debug']) ? 0 : 1;
/* get chained optimization params */
		if (!empty($this->web_optimizer_stage)) {
			$this->username = htmlspecialchars(empty($_GET['username']) ? '' :
				$_GET['username']);
			$this->password = htmlspecialchars(empty($_GET['password']) ? '' :
				$_GET['password']);
			$this->auto_rewrite = round(empty($_GET['auto_rewrite']) ? '' :
				$_GET['auto_rewrite']);
			$this->chained_redirect = 'optimizing.php';
			$this->cache_version = round(empty($_GET['cache_version']) ? '' :
				$_GET['cache_version']);
/* get major stage number, all stages:
 -1		- system, envelope all <script> to try-catch-document.write
 0-9	- inilialization, starts in administrative interface
 10-13	- JS file generation, 1st major stage (common browsers)
 14-19	- CSS Sprites / data:URI generation, 1st major stage
 20-24	- CSS file generation + page parsing, 1st major stage
 25-28	- JS file generation, 2nd major stage (IE 6.0)
 29-34	- CSS Sprites / mhtml generation, 2nd major stage
 35-39	- CSS file generation + page parsing, 2nd major stage
 40-43	- JS file generation, 3rd major stage (IE 7.0)
 44-49	- CSS Sprites / mhtml generation, 2nd major stage
 50-54	- CSS file generation + page parsing, 2nd major stage
 55-58	- JS file generation, 4th major stage (IE 8.0)
 59-64	- CSS Sprites / data:URI generation, 4th major stage
 65-69	- CSS file generation + page parsing, 4th major stage
 70-73	- JS file generation, 5th major stage (IE 7.0 @ Vista)
 74-79	- CSS Sprites generation, 5th major stage
 80-84	- CSS file generation + page parsing, 5th major stage
*/
			$this->cache_stage = floor(($this->web_optimizer_stage - 10) / 15);
		}
/* allow merging of other classes with this one */
		foreach ($options as $key => $value) {
			$this->$key = $value;
		}
		$this->options['active'] = $this->debug_mode ? 1 : $this->options['active'];
/* disable any actions if not active */
		if (empty($this->options['active'])) {
			return;
		}
/* define head of the webpage for scripts / styles */
		$this->head = '';
/* remember current time */
		$this->time = empty($_SERVER['REQUEST_TIME']) ? time() : $_SERVER['REQUEST_TIME'];
		$this->host = $_SERVER['HTTP_HOST'];
		if (strpos($_SERVER['HTTP_HOST'], "www.") !== false ||
			strpos($_SERVER['HTTP_HOST'], "WWW.") !== false) {
				$this->host = substr($this->host, 4);
		}
/* define PHP version */
		$this->php = $this->options['php'];
/* skip buffering (need for integration as plugin) */
		$this->buffered = $this->options['buffered'];
/* Sets User Agent to differ IE from non-IE */
		$this->ua = empty($_SERVER['HTTP_USER_AGENT']) ? '' : $_SERVER['HTTP_USER_AGENT'];
/* HTTPS or not ? */
		$this->https = empty($_SERVER['HTTPS']) ? '' : 's';
/* Set options */
		$this->set_options();
/* Include base plugin class */
		if (is_array($this->options['plugins'])) {
			include_once($this->options['css']['installdir'] . 'libs/php/class.plugin.php');
		}
/* Remember current page encoding */
		$this->encoding = '';
/* Define the gzip headers */
		$this->set_gzip_headers();
/* Deal with flushed content or not? */
		$this->flushed = false;
		$excluded_html_pages = '';
		$included_user_agents = '';
		$retricted_cookie = 0;
		if (!empty($this->options['page']['cache'])) {
			$this->start_cache_engine();
/* HTML cache ? */
			if (!empty($this->options['page']['cache_ignore']) ||
				!empty($this->options['restricted'])) {
				$list = (empty($this->options['page']['cache_ignore']) ? '' : $this->options['page']['cache_ignore']) .
					(empty($this->options['restricted']) ? '' : ' ' . $this->options['restricted']);
				$excluded_html_pages = preg_replace("/ /", "|", preg_replace("/([\?!\^\$\|\(\)\[\]\{\}])/", "\\\\$1", $list));
			}
			if (!empty($this->options['page']['allowed_user_agents'])) {
				$included_user_agents = preg_replace("/ /", "|", preg_replace("/([\?!\^\$\|\(\)\[\]\{\}])/", "\\\\$1", $this->options['page']['allowed_user_agents']));
			}
			if (!empty($this->options['page']['exclude_cookies'])) {
				$cookies = explode(" ", $this->options['page']['exclude_cookies']);
				foreach ($cookies as $cookie) {
					if (isset($_COOKIE[$cookie])) {
						$retricted_cookie = 1;
					}
				}
			}
		}
/* cache if
  - option is enabled,
  - don't parse excluded pages,
  - or parse included USER AGENTS,
  - don't parse pages with excluded coockies,
  - flush or gzip for HTML are disabled,
  - headers have not been sent,
  - page is requested by GET,
  - no chained optimization,
  - no debug mode,
  - external cache restriction.
*/
		$this->cache_me = !empty($this->options['page']['cache']) &&
			(empty($this->options['page']['cache_ignore']) ||
				!preg_match("!" . $excluded_html_pages . "!is", $_SERVER['REQUEST_URI']) ||
				preg_match("!" . $included_user_agents . "!is", $this->ua)) &&
			!$retricted_cookie &&
			(empty($this->options['page']['gzip']) ||
				empty($this->options['page']['flush'])) &&
			!headers_sent() &&
			(getenv('REQUEST_METHOD') == 'GET') &&
			empty($this->web_optimizer_stage) &&
			!$this->debug_mode &&
			empty($this->no_cache);
/* check if we can get out cached page */
		if (!empty($this->cache_me)) {
			$this->uri = $this->convert_request_uri();
/* gzip cached content before output? (plugins have onCache) */
			$gzip_me = is_array($this->options['plugins']);
			$cache_plain_key = $this->view->ensure_trailing_slash($this->uri) . 'index' . $this->ua_mod . '.html';
			$cache_key = $cache_plain_key .
				($this->options['page']['flush'] ||
				empty($this->encoding_ext) ||
				$gzip_me ? '' : $this->encoding_ext);
			$timestamp = $this->cache_engine->get_mtime($cache_key);
/* try to get from cache non-gzipped page if gzipped one doesn't exist */
			if (!$timestamp && !$this->options['page']['flush'] && !empty($this->encoding_ext) && !$gzip_me) {
				$timestamp = $this->cache_engine->get_mtime($cache_plain_key);
				$gzip_me = 1;
			}
			if ($timestamp && $this->time - $timestamp < $this->options['page']['cache_timeout']) {
				$content = $this->cache_engine->get_entry($gzip_me ? $cache_plain_key : $cache_key);
				if (class_exists('JUtility'))
				{
					$token = JUtility::getToken();
					$content = str_replace('##WSS_JTOKEN_WSS##', $token, $content);
				}
/* execute plugin-specific logic */
				if (is_array($this->options['plugins'])) {
					foreach ($this->options['plugins'] as $plugin) {
						$plugin_file =
							$this->options['css']['installdir'] .
								'plugins/' . $plugin . '.php';
						if (@is_file($plugin_file)) {
							include_once($plugin_file);
							$web_optimizer_plugin = new $plugin;
							$content =
								$web_optimizer_plugin->onAfterOptimization($content);
						}
					}
				}
				if ($gzip_me) {
					$cnt = $this->create_gz_compress($content,
						in_array($this->encoding, array('gzip', 'x-gzip')));
					if (!empty($cnt)) {
						$content = $cnt;
/* skip gzip if we can't compress content */
					} else {
						$this->options['page']['gzip'] = 0;
						$this->encoding = '';
					}
				}
				$hash = crc32($content) .
					(empty($this->encoding) ? '' : '-' . str_replace("x-", "", $this->encoding));
/* check for return visits */
				if ((isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
					stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) == '"' . $hash . '"') ||
					(isset($_SERVER['HTTP_IF_MATCH']) &&
					stripslashes($_SERVER['HTTP_IF_MATCH']) == '"' . $hash . '"')) {
/* return visit and no modifications, so do not send anything */
					header ("HTTP/1.0 304 Not Modified");
					header ("Content-Length: 0");
					while (@ob_end_clean());
					die();
				}
/* set ETag, thx to merzmarkus */
				header("ETag: \"" . $hash . "\"");
/* set content-type */
				if (!empty($this->options['charset'])) {
					header("Content-Type: text/html; charset=" . $this->compress_options['charset']);
				}
				if (empty($this->web_optimizer_stage) &&
					$this->options['page']['clientside_cache']) {
/* not really GMT but is valid locally */
					$ExpStr = date("D, d M Y H:i:s",
						$this->time + $this->options['page']['clientside_timeout']) . " GMT";
					header("Cache-Control: " .
						($this->options['page']['gzip'] ? 'private' : 'public') .
						", max-age=" .
						$this->options['page']['clientside_timeout']);
					header("Expires: " . $ExpStr);
				}
/* check if cached content must be gzipped, can't gzip twice via php for flush */
				if ($this->options['page']['gzip'] && !$this->options['page']['flush']) {
					$this->set_gzip_header();
				}
				while (@ob_end_clean());
				echo $content;
/* content is a head part, flush it after */
				if ($this->options['page']['flush']) {
					flush();
					$this->flushed = true;
				} else {
					die();
				}
			}
		}
/* change some hosts if HTTPS is used */
		if ($this->https && !empty($this->options['page']['parallel_https'])) {
			$this->options['javascript']['host'] =
			$this->options['css']['host'] =
			$this->options['page']['parallel_hosts'] = 
			$this->options['page']['parallel_https'];
		}
/* number of external files calls to process */
		$this->initial_files = array();
/* set internal encoding */
		$this->charset = empty($wss_encoding) ? 'utf8' : $wss_encoding;
/* prepare escaped host */
		$this->host_escaped = str_replace('.', '\.', $this->host);
/* activate application */
		$this->options['active'] = 1;
		if ($this->buffered) {
/* Start things off */
			$this->start();
		}
	}

	/**
	* Write installation progress to JavaScript file
	*
	**/
	function write_progress ($progress) {
		$this->write_file($this->options['javascript']['cachedir'] . 'progress.html', $progress);
	}

	/**
	* Options are read from config.webo.php
	**/
	function set_options () {
/* Set paths with new options */
		$this->options['document_root'] = empty($this->options['document_root']) ? '' : $this->options['document_root'];
		$this->view->set_paths($this->options['document_root']);
/* Set local root if chained optimization */
		if (!empty($this->web_optimizer_stage)) {
			$this->view->paths['full']['current_directory'] = $this->view->paths['full']['document_root'];
			$this->view->paths['relative']['current_directory'] = $this->view->paths['relative']['document_root'];
			$_SERVER['REQUEST_URI'] = '/';
/* force User Agent on chained optimization */
			$mods = array(
/* all common browsers except IE */
				'',
/* IE 6.0, when will it die? */
				'.ie6',
/* IE 7.0 */
				'.ie7',
/* IE 8.0 */
				'.ie8',
/* Mobile Agents */
				'.ma'
			);
			$this->ua_mod = $mods[$this->cache_stage];
		}
		$this->premium = $this->view->validate_license($this->options['license'], $this->options['html_cachedir'], $this->options['host']);
		$this->set_user_agent();
		$webo_cachedir = $this->view->unify_dir_separator(realpath(dirname(__FILE__) . '/../') . '/');
/* ensure trailing slashes */
		$this->options['html_cachedir'] = $this->view->ensure_trailing_slash($this->options['html_cachedir']);
		$this->options['css_cachedir'] = $this->view->ensure_trailing_slash($this->options['css_cachedir']);
		$this->options['javascript_cachedir'] = $this->view->ensure_trailing_slash($this->options['javascript_cachedir']);
/* normalize host */
		if (!empty($this->options['host'])) {
			$this->options['host'] = preg_replace("!^https?://!", "", $this->options['host']);
		}
/* Read in options */
		$full_options = array(
			"javascript" => array(
				"cachedir" => $this->options['javascript_cachedir'],
				"cachedir_relative" => str_replace($this->options['document_root'], "/", $this->options['javascript_cachedir']),
				"installdir" => $webo_cachedir,
				"gzip" => $this->options['gzip']['javascript'] &&
					((!$this->options['htaccess']['mod_gzip'] &&
						!$this->options['htaccess']['mod_deflate'] &&
						(!$this->options['htaccess']['mod_rewrite'] ||
							!$this->options['htaccess']['mod_mime'] ||
							!$this->options['htaccess']['mod_expires'])) ||
					!$this->options['htaccess']['enabled']),
				"gzip_level" => round($this->options['gzip']['javascript_level']),
				"minify" => $this->options['minify']['javascript'],
				"minify_body" => $this->options['minify']['javascript_body'],
				"minify_with" => $this->options['minify']['with_jsmin'] ?
					'jsmin' : ($this->options['minify']['with_yui'] ?
					'yui' : ($this->options['minify']['with_packer'] ?
					'packer' : '')),
				"minify_try" => $this->options['external_scripts']['include_try'],
				"minify_exclude" => $this->options['external_scripts']['minify_exclude'],
				"remove_duplicates" => $this->options['external_scripts']['duplicates'],
				"far_future_expires" => $this->options['far_future_expires']['javascript'] &&
					!$this->options['htaccess']['mod_expires'],
				"far_future_expires_php" => $this->options['far_future_expires']['javascript'],
				"far_future_expires_rewrite" => $this->options['htaccess']['mod_rewrite'] &&
					$this->options['htaccess']['enabled'] &&
					$this->options['far_future_expires']['javascript'],
				"unobtrusive_body" => $this->options['unobtrusive']['body'] &&
					!$this->options['unobtrusive']['all'],
				"external_scripts" => $this->options['external_scripts']['on'] &&
					$this->options['minify']['javascript'],
				"inline_scripts" => $this->options['external_scripts']['inline'] &&
					$this->options['minify']['javascript'],
				"external_scripts_head_end" => $this->options['external_scripts']['head_end'],
				"external_scripts_exclude" => $this->options['external_scripts']['ignore_list'],
				"dont_check_file_mtime" => $this->options['performance']['mtime'],
				"file" => $this->options['minify']['javascript_file'],
				"host" => $this->options['minify']['javascript_host'],
				"https" => $this->premium > 1 ? $this->options['parallel']['https'] : ''
			),
			"css" => array(
				"cachedir" => $this->options['css_cachedir'],
				"cachedir_relative" => str_replace($this->options['document_root'], "/", $this->options['css_cachedir']),
				"installdir" => $webo_cachedir,
				"gzip" => $this->options['gzip']['css'] &&
					((!$this->options['htaccess']['mod_gzip'] &&
						!$this->options['htaccess']['mod_deflate'] &&
						(!$this->options['htaccess']['mod_rewrite'] ||
							!$this->options['htaccess']['mod_mime'] ||
							!$this->options['htaccess']['mod_expires'])) ||
					!$this->options['htaccess']['enabled']),
				"gzip_level" => round($this->options['gzip']['css_level']),
				"minify" => $this->options['minify']['css'],
				"minify_body" => $this->options['minify']['css_body'],
				"minify_with" => $this->options['minify']['css_min'] == 2 ?
					'tidy' : ($this->options['minify']['css_min'] ? 'basic' : ''),
				"far_future_expires" => $this->options['far_future_expires']['css'] &&
					!$this->options['htaccess']['mod_expires'],
				"far_future_expires_php" => $this->options['far_future_expires']['css'],
				"far_future_expires_rewrite" => $this->options['htaccess']['mod_rewrite'] &&
					$this->options['htaccess']['enabled'] &&
					$this->options['far_future_expires']['css'],
				"data_uris" => $this->options['data_uris']['on'],
/* disable mhtml for IE7- under HTTPS */
				"data_uris_mhtml" => $this->options['data_uris']['mhtml'] &&
					(!$this->https || (!strpos($this->ua, 'MSIE 6') && !strpos($this->ua, 'MSIE 7'))),
				"data_uris_separate" => $this->options['data_uris']['separate'] &&
					((!empty($this->ua_mod) &&
							$this->options['data_uris']['mhtml']) ||
						(empty($this->ua_mod) &&
							$this->options['data_uris']['on'])),
				"data_uris_domloaded" => $this->options['data_uris']['domloaded'],
				"data_uris_size" => round($this->options['data_uris']['size']),
				"data_uris_mhtml_size" => round($this->options['data_uris']['mhtml_size']),
				"data_uris_exclude" => $this->options['data_uris']['ignore_list'],
				"data_uris_exclude_mhtml" => $this->options['data_uris']['additional_list'],
				"css_sprites" => $this->options['css_sprites']['enabled'],
				"css_sprites_expires_rewrite" => (!$this->options['htaccess']['mod_rewrite'] ||
					!$this->options['htaccess']['enabled']) &&
					$this->options['far_future_expires']['images'],
				"css_sprites_ignore" => $this->options['css_sprites']['ignore'],
				"css_sprites_exclude" => $this->options['css_sprites']['ignore_list'],
				"truecolor_in_jpeg" => $this->options['css_sprites']['truecolor_in_jpeg'],
				"aggressive" => $this->options['css_sprites']['aggressive'],
				"no_ie6" => $this->options['css_sprites']['no_ie6'],
				"dimensions_limited" => round($this->options['css_sprites']['dimensions_limited']),
				"css_sprites_extra_space" => $this->options['css_sprites']['extra_space'],
				"punypng" => (!empty($this->options['punypng']) ? $this->options['punypng'] : '') &&
					($this->premium > 1),
				"css_restore_properties" => $this->options['performance']['restore_properties'] &&
					($this->premium > 1),
				"unobtrusive_body" => false,
				"parallel" => $this->options['parallel']['enabled'],
				"parallel_hosts" => $this->options['parallel']['allowed_list'],
				"external_scripts" => $this->options['external_scripts']['css'],
				"inline_scripts" => $this->options['external_scripts']['css_inline'],
				"external_scripts_exclude" => $this->options['external_scripts']['additional_list'],
				"include_code" => $this->options['external_scripts']['include_code'],
				"dont_check_file_mtime" => $this->options['performance']['mtime'],
				"file" => $this->options['minify']['css_file'],
				"host" => $this->options['minify']['css_host'],
				"https" => $this->premium > 1 ? $this->options['parallel']['https'] : ''
			),
			"page" => array(
				"cachedir" => $this->options['html_cachedir'],
				"cache_engine" => $this->options['performance']['cache_engine'],
				"cache_engine_options" => $this->options['performance']['cache_engine_options'],
				"cachedir_relative" => str_replace($this->options['document_root'], "/", $this->options['html_cachedir']),
				"installdir" => $webo_cachedir,
				"host" => $this->options['host'],
				"gzip" => $this->options['gzip']['page'] &&
					((!$this->options['htaccess']['mod_gzip'] &&
							!$this->options['htaccess']['mod_deflate']) ||
						!$this->options['htaccess']['enabled']),
				"gzip_noie" => $this->options['gzip']['noie'],
				"gzip_level" => round($this->options['gzip']['page_level']),
				"gzip_cookie" => $this->options['gzip']['cookie'],
				"minify" => $this->options['minify']['page'],
				"minify_aggressive" => $this->options['minify']['html_one_string'],
				"remove_comments" => $this->options['minify']['html_comments'],
				"dont_check_file_mtime" => $this->options['performance']['mtime'],
				"cache_images" => $this->options['far_future_expires']['images'],
				"far_future_expires_rewrite" => (!($this->options['htaccess']['mod_rewrite'] ||
						$this->options['htaccess']['mod_expires']) ||
					!$this->options['htaccess']['enabled']) &&
					$this->options['far_future_expires']['images'],
				"far_future_expires_external" => $this->options['far_future_expires']['external'],
				"clientside_cache" => $this->options['far_future_expires']['html'],
				"clientside_timeout" => $this->options['far_future_expires']['html_timeout'],
				"cache" => $this->options['html_cache']['enabled'],
				"cache_timeout" => $this->options['html_cache']['timeout'],
				"flush" => $this->options['html_cache']['flush_only'],
				"flush_size" => $this->options['html_cache']['flush_size'],
				"cache_ignore" => $this->options['html_cache']['ignore_list'],
				"cache_params" => $this->options['html_cache']['params'],
				"allowed_user_agents" => $this->options['html_cache']['allowed_list'],
				"exclude_cookies" => $this->options['html_cache']['additional_list'],
				"parallel" => $this->options['parallel']['enabled'],
				"parallel_hosts" => $this->options['parallel']['allowed_list'],
				"parallel_satellites" => $this->options['parallel']['additional'],
				"parallel_satellites_hosts" => $this->options['parallel']['additional_list'],
				"parallel_ignore" => $this->options['parallel']['ignore_list'],
				"parallel_css" => $this->options['parallel']['css'],
				"parallel_javascript" => $this->options['parallel']['javascript'],
				"parallel_ftp" => $this->options['parallel']['ftp'],
				"parallel_https" => $this->options['parallel']['https'],
				"unobtrusive_informers" => $this->options['unobtrusive']['informers'] &&
					($this->premium > 1),
				"unobtrusive_counters" => $this->options['unobtrusive']['counters'] &&
					($this->premium > 1),
				"unobtrusive_ads" => $this->options['unobtrusive']['ads'] &&
					($this->premium > 1),
				"unobtrusive_all" => $this->options['unobtrusive']['all'] &&
					($this->premium > 1),
				"unobtrusive_iframes" => $this->options['unobtrusive']['iframes'] &&
					($this->premium > 1),
				"unobtrusive_onload" => $this->options['unobtrusive']['on'] &&
					($this->premium > 1),
				"unobtrusive_inline" => $this->options['unobtrusive']['on'] == 2 &&
					($this->premium > 1),
				"footer" => $this->premium ? $this->options['footer']['text'] : 1,
				"footer_image" => $this->options['footer']['image'],
				"footer_text" => $this->options['footer']['link'],
				"footer_style" => $this->options['footer']['css_code'],
				"spot" => $this->premium ? $this->options['footer']['spot'] : 1,
				"counter" => $this->options['footer']['counter'],
				"htaccess_username" => $this->options['external_scripts']['user'],
				"htaccess_password" => $this->options['external_scripts']['pass'],
				"html_tidy" => $this->options['performance']['plain_string'],
				"sprites" => $this->options['css_sprites']['html_sprites'],
				"dimensions_limited" => round($this->options['css_sprites']['html_limit']),
				"per_page" => $this->options['css_sprites']['html_page']
			),
			"document_root" => $this->options['document_root'],
			"document_root_relative" => str_replace("//", "/", str_replace($this->options['document_root'], "/", $this->options['website_root'])),
			"website_root" => $this->options['website_root'],
			"cache_version" => round($this->options['performance']['cache_version']),
			"uniform_cache" => $this->options['performance']['uniform_cache'],
			"plugins" => ($this->premium > 1) &&
				!empty($this->options['plugins']) ? explode(" ", $this->options['plugins']) : '',
			"restricted" => ($this->premium > 1) &&
				!empty($this->options['restricted']) ? $this->options['restricted'] : '',
			"days_to_delete" => round($this->options['performance']['delete_old']),
			"charset" => $this->options['charset']
		);
		$this->lc = $this->options['license'];
/* overwrite other options array that we passed in */
		$this->options = $full_options;
	}

	/**
	* Start saving the output buffer
	*
	**/
	function start () {
		ob_start();
		ob_start();
		ob_implicit_flush(0);
	}

	/**
	* Compress passes content directly
	*
	**/
	function compress ($content) {
		$this->finish($content);
	}

	/**
	* Do work and return output buffer
	*
	**/
	function finish ($content = false) {
/* disable any actions if not active */
		if (empty($this->options['active'])) {
			return $content;
		}
		if ($content === false) {
			$this->content = ob_get_clean();
/* clear all other buffers */
			while (@ob_end_clean());
		} else {
			$this->content = $content;
		}
/* execute plugin-specific logic, BeforeOptimization event */
		if (is_array($this->options['plugins'])) {
			foreach ($this->options['plugins'] as $plugin) {
				$plugin_file =
					$this->options['css']['installdir'] .
						'plugins/' . $plugin . '.php';
				if (@is_file($plugin_file)) {
					include_once($plugin_file);
					$web_optimizer_plugin = new $plugin;
					$this->content =
						$web_optimizer_plugin->onBeforeOptimization($this->content);
				}
			}
		}
		$skip = 0;
		if (function_exists('get_headers')) {
			$headers = headers_list();
/* define if Content-Type is text/html and allow it */
			foreach ($headers as $head) {
				$header = strtolower($head);
				if (strpos($header, 'content-type:') !== false || strpos($header, 'location:') !== false) {
					$skip++;
				}
				if (strpos($header, 'text/html') || strpos($header, 'application/xhtml+xml')) {
					$skip--;
				}
				if (strpos($header, 'content-base') !== false) {
					$this->basehref = substr($head, 14);
				}
			}
		}
/* also skip AJAX requests with X-Requested-With: XMLHttpRequest */
		if (!$skip &&
			!empty($_SERVER['HTTP_X_REQUESTED_WITH']) &&
			$_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest') {
				$skip = 1;
		}
/* also skip some CMS-ralted parameters */
		if (!$skip && !empty($_GET['no_html'])) {
			$skip = 1;
		}
/* skip some extensions */
		if (!$skip && !empty($_SERVER['QUERY_STRING'])) {
			$query = explode('.', $_SERVER['QUERY_STRING']);
			$ext = strtolower($query[count($query) - 1]);
			if (in_array($ext, array('pdf', 'doc', 'xls', 'docx', 'xlsx'))) {
				$skip = 1;
			}
		}
/* skip some known cases of non-HTML content */
		if (!$skip) {
/* reduce amount of viewing content, accelerate 'fast check' by 1% */
			$spot = substr($this->content, 0, 60);
			if (strpos($spot, '<methodResponse') !== false ||
				strpos($spot, '<rss') !== false ||
				strpos($spot, '<feed') !== false ||
				strpos($spot, '<urlset') !== false ||
				strpos($spot, '<smf') !== false ||
				strpos($spot, '{') === 0 ||
				strlen($this->content) < 200) {
					$skip = 1;
			}
		}
/* restrict URL from configuration */
		if (!$skip &&
			!empty($this->options['restricted'])) {
				if (preg_match("@" . preg_replace("/ /", "|",
					preg_replace("/([\?!\^\$\|\(\)\[\]\{\}])/",
					"\\\\$1",
					$this->options['restricted'])) . "@",
					$_SERVER['REQUEST_URI'])) {
						$skip = 1;
				}
		}
/* skip RSS, SMF xml format */
		if (!$skip) {
/* find all files in head to process */
				$this->get_script_array();
/* Run the functions specified in options */
				if (is_array($this->options)) {
					foreach ($this->options as $func => $option) {
						if (method_exists($this, $func)) {
							if (!empty($option['gzip']) ||
								!empty($option['minify']) ||
								!empty($option['far_future_expires']) ||
								!empty($option['parallel']) ||
								!empty($option['unobtrusive_all']) ||
								!empty($option['unobtrusive_ads']) ||
								!empty($option['unobtrusive_counters']) ||
								!empty($option['unobtrusive_informers']) ||
								!empty($option['unobtrusive_iframes']) ||
								!empty($option['cache']) ||
								!empty($option['sprites'])) {
									if (!empty($this->web_optimizer_stage)) {
										$this->write_progress($this->web_optimizer_stage++);
									}
									$this->$func($option, $func);
							}
						}
					}
				}
				if (!empty($this->web_optimizer_stage)) {
					$this->write_progress($this->web_optimizer_stage);
/* redirect to installation page if chained optimization if finished */
					if ($this->web_optimizer_stage > 85) {
						if ($this->chained_redirect === 'optimizing.php') {
							$this->write_progress(97);
							header('Location: ../index.php?page=install_stage_3&Submit=1&web_optimizer_stage=97&wss__password=' .
								$this->password);
						}
/* else redirect to the next stage */
					} else {
						header('Location: ' . $this->chained_redirect . '?web_optimizer_stage=' . 
							$this->web_optimizer_stage .
							'&password=' .
							$this->password .
							'&web_optimizer_debug=1');
					}
					while (@ob_end_clean());
					die();
				}
		}
/* remove marker for styles */
		$this->content = str_replace('@@@WSSSTYLES@@@', '', $this->content);
/* Return content to requestor */
		if ($content) {
			return $this->content;
/* or echo content to the browser */
		} else {
/* HTTP/1.0 needs Content-Length sometimes. With PHP4 we can't check when exactly. */
			if (!empty($this->encoding)) {
				header('Content-Length: ' . strlen($this->content));
			}
			echo $this->content;
/* It's obvious to send anything right after gzipped content */
			if (!empty($this->encoding)) {
				while (@ob_end_clean());
				die();
			}
		}
	}

	/**
	* GZIP and minify the javascript as required
	*
	**/
	function javascript ($options,$type) {
/* prepare list of files to process */
		$script_files = array();
		foreach ($this->initial_files as $file) {
			if (!empty($file['tag']) && $file['tag'] == 'script') {
				$script_files[] = $file;
			}
		}
		if (!empty($options['minify']) && !empty($script_files)) {
			$this->content = $this->do_compress(
				array(
					'cachedir' => $options['cachedir'],
					'cachedir_relative' => $options['cachedir_relative'],
					'installdir' => $options['installdir'],
					'host' => $options['host'],
					'tag' => 'script',
					'type' => 'text/javascript',
					'ext' => 'js',
					'src' => 'src',
					'self_close' => false,
					'gzip' => $options['gzip'],
					'gzip_level' => $options['gzip_level'],
					'minify' => $options['minify'],
					'minify_body' => $options['minify_body'],
					'minify_with' => $options['minify_with'],
					'minify_try' => $options['minify_try'],
					'minify_exclude' => $options['minify_exclude'],
					'remove_duplicates' => $options['remove_duplicates'],
					'far_future_expires' => $options['far_future_expires'],
					'far_future_expires_php' => $options['far_future_expires_php'],
					'far_future_expires_rewrite' => $options['far_future_expires_rewrite'],
					'header' => $type,
					'css_sprites' => false,
					'css_sprites_exclude' => false,
					'aggressive' => false,
					'no_ie6' => false,
					'dimensions_limited' => false,
					'css_sprites_extra_space' => false,
					'data_uris' => false,
					'mhtml' => false,
					'unobtrusive_body' => $options['unobtrusive_body'],
					'external_scripts' => $options['external_scripts'],
					'inline_scripts' => $options['inline_scripts'],
					'external_scripts_head_end' => $options['external_scripts_head_end'],
					'external_scripts_exclude' => $options['external_scripts_exclude'],
					'dont_check_file_mtime' => $options['dont_check_file_mtime'],
					'file' => $options['file'],
					'https' => $options['https']
				),
				$this->content,
				$script_files
			);
		}
	}

	/**
	* GZIP and minify the CSS as required
	*
	**/
	function css ($options, $type) {
/* prepare list of files to process */
		$link_files = array();
		foreach ($this->initial_files as $file) {
			if (!empty($file['tag']) && $file['tag'] == 'link') {
				$link_files[] = $file;
			}
		}
		if (!empty($options['minify']) && !empty($link_files)) {
/* Compress separately for each media type*/
			$this->content = $this->do_compress(
				array(
					'cachedir' => $options['cachedir'],
					'cachedir_relative' => $options['cachedir_relative'],
					'installdir' => $options['installdir'],
					'host' => $options['host'],
					'tag' => 'link',
					'type' => 'text/css',
					'ext' => 'css',
					'src' => 'href',
					'rel' => 'stylesheet',
					'data_uris' => $options['data_uris'],
					'mhtml' => $options['data_uris_mhtml'],
					'data_uris_separate' => $options['data_uris_separate'],
					'data_uris_domloaded' => $options['data_uris_domloaded'],
					'data_uris_size' => $options['data_uris_size'],
					'data_uris_exclude' => $options['data_uris_exclude'],
					'mhtml' => $options['data_uris_mhtml'],
					'mhtml_size' => $options['data_uris_mhtml_size'],
					'mhtml_exclude' => $options['data_uris_exclude_mhtml'],
					'css_sprites' => $options['css_sprites'],
					'css_sprites_ignore' => $options['css_sprites_ignore'],
					'css_sprites_exclude' => $options['css_sprites_exclude'],
					'truecolor_in_jpeg' => $options['truecolor_in_jpeg'],
					'aggressive' => $options['aggressive'],
					'no_ie6' => $options['no_ie6'],
					'dimensions_limited' => $options['dimensions_limited'],
					'css_sprites_extra_space' => $options['css_sprites_extra_space'],
					'css_sprites_expires_rewrite' => $options['css_sprites_expires_rewrite'],
					'punypng' => $options['punypng'],
					'css_restore_properties' => $options['css_restore_properties'],
					'self_close' => true,
					'gzip' => $options['gzip'],
					'gzip_level' => $options['gzip_level'],
					'minify' => $options['minify'],
					'minify_body' => $options['minify_body'],
					'minify_with' => $options['minify_with'],
					'far_future_expires' => $options['far_future_expires'],
					'far_future_expires_php' => $options['far_future_expires_php'],
					'far_future_expires_rewrite' => $options['far_future_expires_rewrite'],
					'header' => $type,
					'unobtrusive_body' => $options['unobtrusive_body'],
					'parallel' => $options['parallel'],
					'parallel_hosts' => $options['parallel_hosts'],
					'external_scripts' => $options['external_scripts'],
					'inline_scripts' => $options['inline_scripts'],
					'external_scripts_exclude' => $options['external_scripts_exclude'],
					'include_code' => $options['include_code'],
					'dont_check_file_mtime' => $options['dont_check_file_mtime'],
					'file' => $options['file'],
					'https' => $options['https']
				),
				$this->content,
				$link_files
			);
		}
	}

	/**
	* GZIP and minify the page itself as required
	*
	**/
	function page ($options, $type) {
		if (empty($this->web_optimizer_stage) && $options['clientside_cache'] && empty($this->flushed)) {
/* not really GMT but is valid locally */
			$ExpStr = date("D, d M Y H:i:s",
				$this->time + $this->options['page']['clientside_timeout']) . " GMT";
			header("Cache-Control: private, max-age=" .
				$this->options['page']['clientside_timeout']);
			header("Expires: " . $ExpStr);
		}
/* move informers, counters, ads, and iframes before </body> */
		$this->replace_informers($options);
/* Minify page itself or parse multiple hosts */
		if (!empty($options['minify']) ||
			(!empty($options['parallel']) &&
				!empty($options['parallel_hosts'])) ||
			!empty($options['unobtrusive_all']) ||
			!empty($this->options['page']['far_future_expires_rewrite']) ||
			!empty($this->options['page']['far_future_expires_external']) ||
			!empty($this->options['page']['sprites'])) {
				$this->content = $this->trimwhitespace($this->content);
		}
/* remove marker for styles and BOM */
		$this->content = str_replace(array("@@@WSSSTYLES@@@", "@@@WSSSCRIPT@@@", ""), "", $this->content);
/* Add script to check gzip possibility */
		if (!empty($options['gzip_cookie']) && empty($_COOKIE['_wo_gzip_checked']) && empty($_SERVER['HTTP_ACCEPT_ENCODING'])) {
			$cookie = '<script type="text/javascript" src="' . $options['cachedir_relative'] . 'wo.cookie.php"></script>';
			if ($options['html_tidy'] && ($bodypos = strpos($this->content, '</body>'))) {
				$this->content = substr_replace($this->content, $cookie, $bodypos, 0);
			} elseif ($options['html_tidy'] && ($bodypos = strpos($this->content, '</BODY>'))) {
				$this->content = substr_replace($this->content, $cookie, $bodypos, 0);
			} else {
				$this->content = preg_replace('@(</body>)@is', $cookie . "$1", $this->content);
/* a number of engines doesn't set </body> */
				if (!strpos($this->content, "wo.cookie")) {
					$this->content .= $cookie;
				}
			}
		}
/* execute plugin-specific logic, AfterOptimization event */
		if (is_array($this->options['plugins'])) {
			foreach ($this->options['plugins'] as $plugin) {
				$plugin_file =
					$this->options['css']['installdir'] .
						'plugins/' . $plugin . '.php';
				if (@is_file($plugin_file)) {
					include_once($plugin_file);
					$web_optimizer_plugin = new $plugin;
					$this->content =
						$web_optimizer_plugin->onAfterOptimization($this->content);
				}
			}
		}
		if (!empty($this->web_optimizer_stage)) {
			$this->write_progress($this->web_optimizer_stage++);
		}
/* check if we need to store cached page */
		if (!empty($this->cache_me)) {
/* add client side replacement for WordPress comment fields */
			if (defined('WP_CACHE')) {
				foreach ($_COOKIE as $key => $value) {
					if (strpos($key, 'comment_author') === 0) {
						$this->content = str_replace('value="'. urldecode($value) .'"', 'value=""', $this->content);
					}
				}
				$this->content = preg_replace("@(</body>)@is", '<script type="text/javascript">(function(){var a=document.cookie.split(";"),b,c=0,d,e;while(b=a[c++]){if(b.indexOf("comment_author_")!=-1){d=b.split("=");e=document.getElementById(d[0].replace(/(_?[a-f0-9]{32,}|\s?comment_author_)/g,"")||"author");if(e){e.value=unescape(d[1].replace(/\+/g," "))}}}}())</script>$1', $this->content);
			}
			if (class_exists('JUtility'))
			{
				$token = JUtility::getToken();
				$this->content = str_replace($token, '##WSS_JTOKEN_WSS##', $this->content);
			}				
/* prepare flushed part of content */
			if (!empty($options['flush']) && empty($this->encoding)) {
				if (empty($options['flush_size'])) {
					if ($this->options['page']['html_tidy'] && ($headpos = strpos($source, '</head>'))) {
						$content_to_write = substr($this->content, 0, $headpos + 7);
					} elseif ($this->options['page']['html_tidy'] && ($headpos = strpos($source, '</HEAD>'))) {
						$content_to_write = substr($this->content, 0, $headpos + 7);
					} else {
						$content_to_write = preg_replace("!(.*<\/head>).*!is", "$1", $this->content);
					}
				} else {
					$content_to_write =
						substr($this->content, 0, $options['flush_size']);
				}
			}
			$ordinary_cache_key = $this->view->ensure_trailing_slash($this->uri) . 'index' . $this->ua_mod . '.html';
			$cache_key = $ordinary_cache_key . (empty($this->encoding_ext) ? '' : $this->encoding_ext);
			$timestamp = $this->cache_engine->get_mtime($cache_key);
/* set ETag, thx to merzmarkus */
			if (empty($options['flush'])) {
				header("ETag: \"" .
					md5($this->content) .
					(empty($this->encoding) ? '' : '-' .
						str_replace("x-", "", $this->encoding)) .
					"\"");
			}
			if (empty($timestamp) || $this->time - $timestamp > $options['cache_timeout']) {
				if (!empty($options['gzip']) && !empty($this->encoding)) {
					$content_to_write = $this->create_gz_compress($this->content,
						in_array($this->encoding, array('gzip', 'x-gzip')));
/* or just write full or non-gzipped content */
				} elseif (empty($options['flush']) || !empty($this->encoding)) {
					$content_to_write = $this->content;
				}
/* don't create empty files */
				if (!empty($content_to_write)) {
					$this->cache_engine->put_entry($cache_key, $content_to_write, $this->time);
				}
/* create uncompressed file for plugins */
				if (is_array($this->options['plugins']) &&
					!empty($this->encoding_ext)) {
						$this->cache_engine->put_entry($ordinary_cache_key, $this->content, $this->time);
				}
			}
		}
/* execute plugin-specific logic, Cache event */
		if (is_array($this->options['plugins'])) {
			foreach ($this->options['plugins'] as $plugin) {
				$plugin_file =
					$this->options['css']['installdir'] .
						'plugins/' . $plugin . '.php';
				if (@is_file($plugin_file)) {
					include_once($plugin_file);
					$web_optimizer_plugin = new $plugin;
					$this->content =
						$web_optimizer_plugin->onCache($this->content);
				}
			}
		}
/* strip from content flushed part */
		if (!empty($this->flushed)) {
			if (empty($options['flush_size'])) {
				$options['flush_size'] = strlen($content_to_write);
			}
			$this->content = substr($this->content, $options['flush_size']);
		}
/* Gzip page itself */
		if(!empty($options['gzip']) && !empty($this->encoding)) {
			$content = $this->create_gz_compress($this->content,
				in_array($this->encoding, array('gzip', 'x-gzip')));
			if (!empty($content)) {
				$this->set_gzip_header();
				$this->content = $content;
			}
		}
	}

	/**
	* Write content to file
	* 
	**/
	function write_file ($file, $content, $upload = 0, $mime = '') {
		if (@function_exists('file_put_contents')) {
			@file_put_contents($file, $content);
		} else {
			$fp = @fopen($file, "a");
			if ($fp) {
/* block file from writing */
				@flock($fp, LOCK_EX);
/* erase content and move to the beginning */
				@ftruncate($fp, 0);
				@fseek($fp, 0);
				@fwrite($fp, $content);
				@fclose($fp);
			}
		}
		@touch($file, $this->time);
		@chmod($file, octdec("0644"));
		if ($upload && !empty($this->options['page']['parallel_ftp'])) {
			$this->view->upload_cdn($file,
				$this->options['document_root'],
				$this->options['page']['parallel_ftp'],
				$mime,
				$this->options['page']['host']);
		}
	}

	/**
	* Adds multiple hosts to HTML for images
	*
	**/
	function add_multiple_hosts ($content, $hosts, $satellites, $satellites_hosts) {
/* limit by 4 */
		if (count($hosts) > 4) {
			$hosts = array($hosts[0], $hosts[1], $hosts[2], $hosts[3]);
		}
		if (count($satellites_hosts) > 4) {
			$satellites_hosts = array($satellites_hosts[0], $satellites_hosts[1], $satellites_hosts[2], $satellites_hosts[3]);
		}
		$count = count($hosts);
		$count_satellites = count($satellites_hosts);
		$replaced = array();
		$IMG = strpos($content, '<IMG');
		if (!empty($this->options['page']['html_tidy']) && !$IMG) {
			$_content = $content;
			while ($pos = strpos($_content, '<img')) {
				$len = strpos(substr($_content, $pos), '>');
/* gets image tag w/o the closing >, it's OK */
				$imgs[] = array(substr($_content, $pos, $len));
				$_content = substr_replace($_content, '', $pos, $len);
			}
		} elseif (empty($this->options['page']['html_tidy']) || $IMG) {
			preg_match_all("!<img[^>]+>!is", $content, $imgs, PREG_SET_ORDER);
		}
		if (!empty($this->options['page']['sprites']) && !empty($imgs)) {
			require($this->options['css']['installdir'] . 'libs/php/html.sprites.php');
			$html_sprites = new html_sprites($imgs, $this->options, $this);
			$content = $html_sprites->process($content);
		}
		if (!empty($imgs)) {
			$ignore_list = explode(" ", $this->options['page']['parallel_ignore']);
			$ignore_sprites = explode(" ", $this->options['css']['css_sprites_exclude']);
			foreach ($imgs as $image) {
				if (!empty($this->options['page']['html_tidy']) && ($pos=strpos($image[0], ' src="'))) {
					$old_src = substr($image[0], $pos+6, strpos(substr($image[0], $pos+6), '"'));
				} elseif (!empty($this->options['page']['html_tidy']) && ($pos=strpos($image[0], " src='"))) {
					$old_src = substr($image[0], $pos+6, strpos(substr($image[0], $pos+6), "'"));
				} else {
					$old_src = preg_replace("!^['\"\s]*(.*?)['\"\s]*$!is", "$1", preg_replace("!.*[\"'\s]src\s*=\s*(\"[^\"]+\"|'[^']+'|[\S]+).*!is", "$1", $image[0]));
				}
				$old_src = $this->convert_basehref($old_src);
				$old_src_param = ($old_src_param_pos = strpos($old_src, '?')) ? substr($old_src, $old_src_param_pos) : '';
/* image file name to check through ignore list */
				$img = preg_replace("@.*/@", "", $old_src);
				$absolute_src = $this->convert_path_to_absolute($old_src,
					array('file' => $_SERVER['REQUEST_URI']));
				if (empty($replaced[$image[0]])) {
					if (!empty($this->options['page']['sprites']) &&
						((!in_array($img, $ignore_sprites) && empty($this->options['css']['css_sprites_ignore'])) ||
						(in_array($img, $ignore_sprites) && !empty($this->options['css']['css_sprites_ignore']))) &&
						!empty($html_sprites->css_images[$absolute_src]) && !empty($html_sprites->css_images[$absolute_src][2]) &&
						(empty($this->ua_mod) || $this->ua_mod != '.ie6' || empty($this->options['css']['no_ie6']))) {
							$class = substr($html_sprites->css_images[$absolute_src][8], 1);
							if (!empty($this->options['page']['html_tidy']) &&
								(strpos($image[0], 'class') || strpos($image[0], 'CLASS'))) {
									if ($pos=strpos($image[0], ' class="')) {
										$end = strpos(substr($image[0], $pos + 7), '"');
										$new_image = substr($image[0], 0, $pos + 7 + $end) .
											' ' . $class . substr($image[0], $pos + 7 + $end);
									} elseif ($pos=strpos($image[0], " class='")) {
										$end = strpos(substr($image[0], $pos + 7), "'");
										$new_image = substr($image[0], 0, $pos + 7 + $end) .
											' ' . $class . substr($image[0], $end);
									} else {
										$new_image = preg_replace("!(.*['\"\s]class\s*=\s*)([\"'])?([^\"']+)([\"'])?([\s/>])(.*)!is", "$1$2$3 " .
											$class . "$4$5$6", $image[0]);
									}
							} elseif (preg_match("@['\"\s]class\s*=\s*['\"]@is", $image[0])) {
								$new_image = preg_replace("!(.*['\"\s]class\s*=\s*)([\"'])?([^\"']+)([\"'])?([\s/>])(.*)!is", "$1$2$3 " .
									$class . "$4$5$6", $image[0]);
							} elseif (preg_match("@['\"\s]class\s*=\s*@is", $image[0])) {
								$new_image = preg_replace("!(.*['\"\s]class\s*=\s*)([^\s]+)\s!is", "$1\"$2 " .
									$class . "\" ", $image[0]);
							} else {
								$new_image = substr($image[0], 0, 4) . ' class="' .
									$class . '"' . substr($image[0], 4);
							}
/* add transparent GIF or data:URI chunk */
							$new_src = (empty($this->ua_mod) ||
								substr($this->ua_mod, 3, 1) > 7) &&
								!$this->options['uniform_cache'] ?
								'data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==' :
								((empty($this->options['page']['far_future_expires_rewrite']) ?
									'' : $this->options['page']['cachedir_relative'] . 'wo.static.php?') .
									$this->options['page']['cachedir_relative'] . '0.gif');
/* are we operating with multiple hosts */
					} elseif (!empty($this->options['page']['parallel']) &&
						!empty($this->options['page']['parallel_hosts']) &&
						(!count($ignore_list) || !in_array(str_replace($old_src_param, '', $img), $ignore_list))) {
/* skip images on different hosts */
						if (preg_match("!//(www\.)?" . $this->host_escaped . "/+!i", $old_src) || strpos($old_src, '//') === false) {
/* using secure host */
							if ($this->https && !empty($this->options['page']['parallel_https'])) {
								$new_host = $this->options['page']['parallel_https'];
							} else {
/* calculating unique sum from image src */
								$sum = 0;
								$i = ceil(strlen($old_src)/2);
								while (isset($old_src{$i++})) {
									$sum += ord($old_src{$i-1});
								}
								$host = $hosts[$sum%$count];
/* if we have dot in the distribution host - it's a domain name */
								$new_host = $host .
									((strpos($host, '.') === false) ?
									'.' . $this->host : '');
							}
							$new_src = "//" .
								$new_host .
								$absolute_src .
								preg_replace("!(www\.)?" . $this->host_escaped . "!i",
									$new_host, $old_src_param);
						} elseif ($count_satellites && !empty($satellites_hosts[0]) && empty($replaced[$old_src])) {
							$img_host = preg_replace("@(https?:)?//(www\.)?([^/]+)/.*@", "$3", $old_src);
/* check if we can distribute this image through satellites' hosts */
							if (in_array($img_host, $satellites)) {
								$new_src = preg_replace("@(https?://)(www\.)?([^/]+)/@", "$1" . $hosts[strlen($old_src)%$count] . ".$3/", $old_src);
							}
						}
/* or replacing images with rewrite to Expires setter? */
					} elseif (!empty($this->options['page']['far_future_expires_rewrite']) ||
						!empty($this->options['page']['far_future_expires_external'])) {
/* add static proxy for external images */
							if (!$absolute_src &&
								$this->options['page']['far_future_expires_external']) {
									$absolute_src = $old_src;
							}
/* do not touch dynamic images / styles / scripts -- how we can handle them? */
							if ($absolute_src &&
								(preg_match("@\.(bmp|gif|png|ico|jpe?g)$@is", $absolute_src) ||
									!empty($this->options['page']['far_future_expires_external']))) {
										$new_src =
											$this->options['page']['cachedir_relative'] .
											'wo.static.php?' . $absolute_src;
							}
					}
					if (!empty($new_src)) {
						if (empty($new_image)) {
/* prevent replacing images from oher domains with the same file name */
							$new_src_image = str_replace($old_src, $new_src, $image[0]);
						} else {
/* replace src in image with new class */
							$new_src_image = str_replace($old_src, $new_src, $new_image);
						}
						$content = str_replace($image[0], $new_src_image, $content);
						$new_src = '';
						$new_image = '';
					}
					$replaced[$image[0]] = 1;
				}
			}
		}
		return $content;
	}

	/**
	* Returns GZIP compressed content string with header
	*
	**/
	function create_gz_compress ($content, $force_gzip = true) {
		if (!empty($this->encoding)) {
			if (!empty($force_gzip) && function_exists('gzcompress')) {
				$size = strlen($content);
				$crc = crc32($content);
				$cnt = "\x1f\x8b\x08\x00\x00\x00\x00\x00";
				$content = gzcompress($content, $this->options['page']['gzip_level']);
				$content = substr($content, 0, -4);
				$cnt .= $content;
				$cnt .= pack('V', $crc);
				$cnt .= pack('V', $size);
			} elseif (empty($force_gzip) && function_exists('gzdeflate')) {
				$cnt = gzdeflate($content, $this->options['page']['gzip_level']);
			}
			return $cnt;
		} else {
			return false;
		}
	}

	/**
	* Sets current encoding for HTML document
	*
	**/
	function set_gzip_encoding () {
		if (!empty($_SERVER["HTTP_ACCEPT_ENCODING"]) && !empty($this->options['page']['gzip'])) {
			$gzip_no_ie = !in_array($this->ua_mod, array('.ie6', '.ie7')) || empty($this->options['page']['gzip_noie']);
			$ae = strtolower($_SERVER["HTTP_ACCEPT_ENCODING"]);
			if (strpos($ae, 'x-gzip') !== false && $gzip_no_ie) {
				$this->encoding = 'x-gzip';
				$this->encoding_ext = '.gz';
			} elseif ((strpos($ae, 'gzip') !== false || !empty($_COOKIE['_wo_gzip'])) && $gzip_no_ie) {
				$this->encoding = 'gzip';
				$this->encoding_ext = '.gz';
			} elseif (strpos($ae, 'x-deflate') !== false) {
				$this->encoding = 'x-deflate';
				$this->encoding_ext = '…