From c90e67ea553f1ff0fc22f280583fca22f95f9f42 Mon Sep 17 00:00:00 2001
From: Eric Roberts <eric@cryode.com>
Date: Fri, 11 Jan 2013 21:20:54 -0600
Subject: Improve output cache.

---
 system/core/Output.php | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/system/core/Output.php b/system/core/Output.php
index 27e711783..52a551858 100644
--- a/system/core/Output.php
+++ b/system/core/Output.php
@@ -58,21 +58,21 @@ class CI_Output {
 	 *
 	 * @var	array
 	 */
-	public $headers =	array();
+	public $headers = array();
 
 	/**
 	 * List of mime types
 	 *
 	 * @var	array
 	 */
-	public $mimes =		array();
+	public $mimes = array();
 
 	/**
 	 * Mime-type for the current page
 	 *
 	 * @var	string
 	 */
-	protected $mime_type	= 'text/html';
+	protected $mime_type = 'text/html';
 
 	/**
 	 * Enable Profiler flag
@@ -86,14 +86,14 @@ class CI_Output {
 	 *
 	 * @var	bool
 	 */
-	protected $_zlib_oc =		FALSE;
+	protected $_zlib_oc = FALSE;
 
 	/**
 	 * List of profiler sections
 	 *
 	 * @var	array
 	 */
-	protected $_profiler_sections =	array();
+	protected $_profiler_sections = array();
 
 	/**
 	 * Parse markers flag
@@ -102,7 +102,7 @@ class CI_Output {
 	 *
 	 * @var	bool
 	 */
-	public $parse_exec_vars =	TRUE;
+	public $parse_exec_vars = TRUE;
 
 	/**
 	 * Class constructor
@@ -543,10 +543,16 @@ class CI_Output {
 		}
 
 		$expire = time() + ($this->cache_expiration * 60);
+		
+		// Put together our serialized info.
+		$cache_info = serialize(array(
+			'expire'	=> $expire,
+			'headers'	=> $this->headers
+		));
 
 		if (flock($fp, LOCK_EX))
 		{
-			fwrite($fp, $expire.'TS--->'.$output);
+			fwrite($fp, $cache_info.'ENDCI--->'.$output);
 			flock($fp, LOCK_UN);
 		}
 		else
@@ -595,14 +601,16 @@ class CI_Output {
 		flock($fp, LOCK_UN);
 		fclose($fp);
 
-		// Strip out the embedded timestamp
-		if ( ! preg_match('/^(\d+)TS--->/', $cache, $match))
+		// Look for embedded serialized file info.
+		if ( ! preg_match('/^(.*)ENDCI--->/', $cache, $match))
 		{
 			return FALSE;
 		}
+		
+		$cache_info = unserialize($match[1]);
+		$expire = $cache_info['expire'];
 
 		$last_modified = filemtime($cache_path);
-		$expire = $match[1];
 
 		// Has the file expired?
 		if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
@@ -617,6 +625,12 @@ class CI_Output {
 			// Or else send the HTTP cache control headers.
 			$this->set_cache_header($last_modified, $expire);
 		}
+		
+		// Add headers from cache file.
+		foreach ($cache_info['headers'] as $header)
+		{
+			$this->set_header($header[0], $header[1]);
+		}
 
 		// Display the cache
 		$this->_display(substr($cache, strlen($match[0])));
-- 
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