From b0dd10f8171945e0c1f3527dd1e9d18b043e01a7 Mon Sep 17 00:00:00 2001
From: admin <devnull@localhost>
Date: Fri, 25 Aug 2006 17:25:49 +0000
Subject: Initial Import

---
 system/libraries/Output.php | 241 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 241 insertions(+)
 create mode 100644 system/libraries/Output.php

(limited to 'system/libraries/Output.php')

diff --git a/system/libraries/Output.php b/system/libraries/Output.php
new file mode 100644
index 000000000..f5db3e0d0
--- /dev/null
+++ b/system/libraries/Output.php
@@ -0,0 +1,241 @@
+<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		Rick Ellis
+ * @copyright	Copyright (c) 2006, pMachine, Inc.
+ * @license		http://www.codeignitor.com/user_guide/license.html 
+ * @link		http://www.codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+ 
+// ------------------------------------------------------------------------
+
+/**
+ * Output Class
+ *
+ * Responsible for sending final output to browser
+ * 
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Output
+ * @author		Rick Ellis
+ * @link		http://www.codeigniter.com/user_guide/libraries/output.html
+ */
+class CI_Output {
+
+	var $final_output;
+	var $cache_expiration = 0;
+
+	function CI_Output()
+	{
+		log_message('debug', "Output Class Initialized");
+	}
+	
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Get Output 
+	 *
+	 * Returns the current output string
+	 *
+	 * @access	public
+	 * @return	string
+	 */	
+	function get_output()
+	{
+		return $this->final_output;
+	}
+	
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Set Output 
+	 *
+	 * Sets the output string
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	void
+	 */	
+	function set_output($output)
+	{
+		$this->final_output = $output;
+	}
+	
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Set Cache 
+	 *
+	 * @access	public
+	 * @param	integer
+	 * @return	void
+	 */	
+	function cache($time)
+	{
+		$this->cache_expiration = ( ! ctype_digit($time)) ? 0 : $time;
+	}
+	
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Display Output
+	 *
+	 * All "view" data is automatically put into this variable 
+	 * by the controller class:
+	 *
+	 * $this->final_output
+	 *
+	 * This function simply echos the variable out.  It also does the following:
+	 * 
+	 * Stops the benchmark timer so the page rendering speed can be shown.
+	 *
+	 * Determines if the "memory_get_usage' function is available so that 
+	 * the memory usage can be shown.
+	 *
+	 * @access	public
+	 * @return	void
+	 */		
+	function _display($output = '')
+	{	
+		$BM =& _load_class('CI_Benchmark');
+		
+		if ($output == '')
+		{
+			$output =& $this->final_output;
+		}
+		
+		if ($this->cache_expiration > 0)
+		{
+			$this->_write_cache($output);
+		}
+
+		$elapsed = $BM->elapsed_time('code_igniter_start', 'code_igniter_end');		
+		$memory	 = ( ! function_exists('memory_get_usage')) ? '0' : round(memory_get_usage()/1024/1024, 2).'MB';
+
+		$output = str_replace('{memory_usage}', $memory, $output);		
+		$output = str_replace('{elapsed_time}', $elapsed, $output);
+		
+		echo $output;
+		
+		log_message('debug', "Final output sent to browser");
+		log_message('debug', "Total execution time: ".$elapsed);		
+	}
+	
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Write a Cache File 
+	 *
+	 * @access	public
+	 * @return	void
+	 */	
+	function _write_cache($output)
+	{
+		$obj =& get_instance();	
+		$path = $obj->config->item('cache_path');
+	
+		$cache_path = ($path == '') ? BASEPATH.'cache/' : $path;
+		
+		if ( ! is_dir($cache_path) OR ! is_writable($cache_path))
+		{
+			return;
+		}
+		
+		$uri =	$obj->config->item('base_url', 1).
+				$obj->config->item('index_page').
+				$obj->uri->uri_string();
+		
+		$cache_path .= md5($uri);
+
+        if ( ! $fp = @fopen($cache_path, 'wb'))
+        {
+			log_message('error', "Unable to write ache file: ".$cache_path);
+            return;
+		}
+		
+		$expire = time() + ($this->cache_expiration * 60);
+		
+        flock($fp, LOCK_EX);
+        fwrite($fp, $expire.'TS--->'.$output);
+        flock($fp, LOCK_UN);
+        fclose($fp);
+		@chmod($cache_path, 0777); 
+
+		log_message('debug', "Cache file written: ".$cache_path);
+	}
+
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Update/serve a cached file 
+	 *
+	 * @access	public
+	 * @return	void
+	 */	
+	function _display_cache()
+	{
+		$CFG =& _load_class('CI_Config');
+		$RTR =& _load_class('CI_Router');
+	
+		$cache_path = ($CFG->item('cache_path') == '') ? BASEPATH.'cache/' : $CFG->item('cache_path');
+			
+		if ( ! is_dir($cache_path) OR ! is_writable($cache_path))
+		{
+			return FALSE;
+		}
+		
+		// Build the file path.  The file name is an MD5 hash of the full URI
+		$uri = $CFG->item('base_url', 1).$CFG->item('index_page').$RTR->uri_string;
+		
+		$filepath = $cache_path.md5($uri);
+		
+		if ( ! @file_exists($filepath))
+		{
+			return FALSE;
+		}
+	
+		if ( ! $fp = @fopen($filepath, 'rb'))
+		{
+			return FALSE;
+		}
+			
+		flock($fp, LOCK_SH);
+		
+		$cache = '';
+		if (filesize($filepath) > 0) 
+		{
+			$cache = fread($fp, filesize($filepath)); 
+		}
+	
+		flock($fp, LOCK_UN);
+		fclose($fp); 
+					
+		// Strip out the embedded timestamp		
+		if ( ! preg_match("/(\d+TS--->)/", $cache, $match))
+		{
+			return FALSE;
+		}
+		
+		// Has the file expired? If so we'll delete it.
+		if (time() >= trim(str_replace('TS--->', '', $match['1'])))
+		{ 		
+			@unlink($filepath);
+			log_message('debug', "Cache file has expired. File deleted");
+			return FALSE;
+		}
+
+		// Display the cache
+		$this->_display(str_replace($match['0'], '', $cache));
+		log_message('debug', "Cache file is current. Sending it to browser.");		
+		return TRUE;
+	}
+
+}
+// END Output Class
+?>
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