_zlib_oc = @ini_get('zlib.output_compression'); // Get mime types for later if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php')) { include APPPATH.'config/'.ENVIRONMENT.'/mimes.php'; } else { include APPPATH.'config/mimes.php'; } $this->mime_types = $mimes; log_message('debug', 'Output Class Initialized'); } // -------------------------------------------------------------------- /** * Get Output * * Returns the current output string * * @return string */ public function get_output() { return $this->final_output; } // -------------------------------------------------------------------- /** * Set Output * * Sets the output string * * @param string * @return void */ public function set_output($output) { $this->final_output = $output; return $this; } // -------------------------------------------------------------------- /** * Append Output * * Appends data onto the output string * * @param string * @return void */ public function append_output($output) { if ($this->final_output == '') { $this->final_output = $output; } else { $this->final_output .= $output; } return $this; } // -------------------------------------------------------------------- /** * Set Header * * Lets you set a server header which will be outputted with the final display. * * Note: If a file is cached, headers will not be sent. We need to figure out * how to permit header data to be saved with the cache data... * * @param string * @param bool * @return void */ public function set_header($header, $replace = TRUE) { // If zlib.output_compression is enabled it will compress the output, // but it will not modify the content-length header to compensate for // the reduction, causing the browser to hang waiting for more data. // We'll just skip content-length in those cases. if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) == 0) { return; } $this->headers[] = array($header, $replace); return $this; } // -------------------------------------------------------------------- /** * Set Content Type Header * * @param string extension of the file we're outputting * @return void */ public function set_content_type($mime_type) { if (strpos($mime_type, '/') === FALSE) { $extension = ltrim($mime_type, '.'); // Is this extension supported? if (isset($this->mime_types[$extension])) { $mime_type =& $this->mime_types[$extension]; if (is_array($mime_type)) { $mime_type = current($mime_type); } } } $this->mime_type = $mime_type; $header = 'Content-Type: '.$mime_type; $this->headers[] = array($header, TRUE); return $this; } // -------------------------------------------------------------------- /** * Set HTTP Status Header * moved to Common procedural functions in 1.7.2 * * @param int the status code * @param string * @return void */ public function set_status_header($code = 200, $text = '') { set_status_header($code, $text); return $this; } // -------------------------------------------------------------------- /** * Enable/disable Profiler * * @param bool * @return void */ public function enable_profiler($val = TRUE) { $this->enable_profiler = (is_bool($val)) ? $val : TRUE; return $this; } // -------------------------------------------------------------------- /** * Set Profiler Sections * * Allows override of default / config settings for Profiler section display * * @param array * @return void */ public function set_profiler_sections($sections) { foreach ($sections as $section => $enable) { $this->_profiler_sections[$section] = ($enable !== FALSE) ? TRUE : FALSE; } return $this; } // -------------------------------------------------------------------- /** * Set Cache * * @param integer * @return void */ public function cache($time) { $this->cache_expiration = ( ! is_numeric($time)) ? 0 : $time; return $this; } // -------------------------------------------------------------------- /** * Display Output * * All "view" data is automatically put into this variable by the controller class: * * $this->final_output * * This function sends the finalized output data to the browser along * with any server headers and profile data. It also stops the * benchmark timer so the page rendering speed and memory usage can be shown. * * @param string * @return mixed */ public function _display($output = '') { // Note: We use globals because we can't use $CI =& get_instance() // since this function is sometimes called by the caching mechanism, // which happens before the CI super object is available. global $BM, $CFG; // Grab the super object if we can. if (class_exists('CI_Controller')) { $CI =& get_instance(); } // -------------------------------------------------------------------- // Set the output data if ($output == '') { $output =& $this->final_output; } // -------------------------------------------------------------------- // Is minify requested? if ($CFG->item('minify_output') === TRUE) { $output = $this->minify($output,$this->mime_type); } // -------------------------------------------------------------------- // Do we need to write a cache file? Only if the controller does not have its // own _output() method and we are not dealing with a cache file, which we // can determine by the existence of the $CI object above if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output')) { $this->_write_cache($output); } // -------------------------------------------------------------------- // Parse out the elapsed time and memory usage, // then swap the pseudo-variables with the data $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end'); if ($this->parse_exec_vars === TRUE) { $memory = ( ! function_exists('memory_get_usage')) ? '0' : round(memory_get_usage()/1024/1024, 2).'MB'; $output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output); } // -------------------------------------------------------------------- // Is compression requested? if ($CFG->item('compress_output') === TRUE && $this->_zlib_oc == FALSE && extension_loaded('zlib') && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE) { ob_start('ob_gzhandler'); } // -------------------------------------------------------------------- // Are there any server headers to send? if (count($this->headers) > 0) { foreach ($this->headers as $header) { @header($header[0], $header[1]); } } // -------------------------------------------------------------------- // Does the $CI object exist? // If not we know we are dealing with a cache file so we'll // simply echo out the data and exit. if ( ! isset($CI)) { echo $output; log_message('debug', 'Final output sent to browser'); log_message('debug', 'Total execution time: '.$elapsed); return TRUE; } // -------------------------------------------------------------------- // Do we need to generate profile data? // If so, load the Profile class and run it. if ($this->enable_profiler == TRUE) { $CI->load->library('profiler'); if ( ! empty($this->_profiler_sections)) { $CI->profiler->set_sections($this->_profiler_sections); } // If the output data contains closing and tags // we will remove them and add them back after we insert the profile data $output = preg_replace('|.*?|is', '', $output, -1, $count).$CI->profiler->run(); if ($count > 0) { $output .= ''; } } // Does the controller contain a function named _output()? // If so send the output there. Otherwise, echo it. if (method_exists($CI, '_output')) { $CI->_output($output); } else { echo $output; // Send it to the browser! } log_message('debug', 'Final output sent to browser'); log_message('debug', 'Total execution time: '.$elapsed); } // -------------------------------------------------------------------- /** * Write a Cache File * * @param string * @return void */ public function _write_cache($output) { $CI =& get_instance(); $path = $CI->config->item('cache_path'); $cache_path = ($path == '') ? APPPATH.'cache/' : $path; if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path)) { log_message('error', 'Unable to write cache file: '.$cache_path); return; } $uri = $CI->config->item('base_url'). $CI->config->item('index_page'). $CI->uri->uri_string(); $cache_path .= md5($uri); if ( ! $fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE)) { log_message('error', 'Unable to write cache file: '.$cache_path); return; } $expire = time() + ($this->cache_expiration * 60); if (flock($fp, LOCK_EX)) { fwrite($fp, $expire.'TS--->'.$output); flock($fp, LOCK_UN); } else { log_message('error', 'Unable to secure a file lock for file at: '.$cache_path); return; } fclose($fp); @chmod($cache_path, FILE_WRITE_MODE); log_message('debug', 'Cache file written: '.$cache_path); // Send HTTP cache-control headers to browser to match file cache settings. $this->set_cache_header($_SERVER['REQUEST_TIME'],$expire); } // -------------------------------------------------------------------- /** * Update/serve a cached file * * @param object config class * @param object uri class * @return void */ public function _display_cache(&$CFG, &$URI) { $cache_path = ($CFG->item('cache_path') == '') ? APPPATH.'cache/' : $CFG->item('cache_path'); // Build the file path. The file name is an MD5 hash of the full URI $uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string; $filepath = $cache_path.md5($uri); if ( ! @file_exists($filepath) OR ! $fp = @fopen($filepath, FOPEN_READ)) { return FALSE; } flock($fp, LOCK_SH); $cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : ''; flock($fp, LOCK_UN); fclose($fp); // Strip out the embedded timestamp if ( ! preg_match('/(\d+TS--->)/', $cache, $match)) { return FALSE; } $last_modified = filemtime($cache_path); $expire = trim(str_replace('TS--->', '', $match[1])); // Has the file expired? if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path)) { // If so we'll delete it. @unlink($filepath); log_message('debug', 'Cache file has expired. File deleted.'); return FALSE; } else { // Or else send the HTTP cache control headers. $this->set_cache_header($last_modified,$expire); } // Display the cache $this->_display(str_replace($match[0], '', $cache)); log_message('debug', 'Cache file is current. Sending it to browser.'); return TRUE; } // -------------------------------------------------------------------- /** * Set the HTTP headers to match the server-side file cache settings * in order to reduce bandwidth. * * @param int timestamp of when the page was last modified * @param int timestamp of when should the requested page expire from cache * @return void */ public function set_cache_header($last_modified,$expiration) { $max_age = $expiration - $_SERVER['REQUEST_TIME']; if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && ($last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))) { $this->set_status_header(304); exit; } else { header('Pragma: public'); header('Cache-Control: max-age=' . $max_age . ', public'); header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT'); header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT'); } } // -------------------------------------------------------------------- /** * Reduce excessive size of HTML content. * * @param string * @param string * @return string */ public function minify($output,$type='text/html') { if($type===NULL) { $type = 'text/html'; } switch ($type) { case 'text/html': $size_before = strlen($output); // Keep track of
  and }msU',$output,$textareas_clean);

				// Minify the CSS in all the }msU',$output,$style_clean);
				foreach ($style_clean[0] as $s)
				{
					$output = str_replace($s, $this->minify($s,'text/css'), $output);
				}

				// Replace multiple spaces with a single space.
				$output = preg_replace('!\s{2,}!',"\n",$output);
				
				// Remove comments (non-MSIE conditionals)
				$output = preg_replace('{\s*\s*}msU','',$output);

				// Remove spaces around block-level elements.
				$output = preg_replace('{\s*()\s*}', '$1', $output);

				// Replace mangled 
 etc. tags with unprocessed ones.
				preg_match_all('{}msU',$output,$pres_messed);
				preg_match_all('{}msU',$output,$codes_messed);
				preg_match_all('{}msU',$output,$textareas_messed);
				$output = str_replace($pres_messed[0],$pres_clean[0],$output);
				$output = str_replace($codes_messed[0],$codes_clean[0],$output);
				$output = str_replace($textareas_messed[0],$textareas_clean[0],$output);
				
				$size_after = strlen($output);
				$savings_percent = round(100 - ($size_after / $size_before * 100));
				
				log_message('debug', 'Minifier shaved '.$savings_percent.'% off HTML output size.');

			break;
			
			
			case 'text/css':
			
				// Remove spaces around curly brackets, colons, and semi-colons
				$output = preg_replace('!\s*(:|;|}|{)\s*!','$1',$output);
				
				// Replace spaces with line breaks to limit line lengths
				$output = preg_replace('!\s+!',"\n",$output);

			break;
		}
		
		return $output;
	}


}

/* End of file Output.php */
/* Location: ./system/core/Output.php */