--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smarty/internals/core.read_cache_file.php	Sun Mar 23 14:59:33 2008 -0400
@@ -0,0 +1,101 @@
+<?php
+/**
+ * Smarty plugin
+ * @package Smarty
+ * @subpackage plugins
+ */
+
+/**
+ * read a cache file, determine if it needs to be
+ * regenerated or not
+ *
+ * @param string $tpl_file
+ * @param string $cache_id
+ * @param string $compile_id
+ * @param string $results
+ * @return boolean
+ */
+
+//  $tpl_file, $cache_id, $compile_id, &$results
+
+function smarty_core_read_cache_file(&$params, &$smarty)
+{
+    static  $content_cache = array();
+
+    if ($smarty->force_compile) {
+        // force compile enabled, always regenerate
+        return false;
+    }
+
+    if (isset($content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']])) {
+        list($params['results'], $smarty->_cache_info) = $content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']];
+        return true;
+    }
+
+    if (!empty($smarty->cache_handler_func)) {
+        // use cache_handler function
+        call_user_func_array($smarty->cache_handler_func,
+                             array('read', &$smarty, &$params['results'], $params['tpl_file'], $params['cache_id'], $params['compile_id'], null));
+    } else {
+        // use local cache file
+        $_auto_id = $smarty->_get_auto_id($params['cache_id'], $params['compile_id']);
+        $_cache_file = $smarty->_get_auto_filename($smarty->cache_dir, $params['tpl_file'], $_auto_id);
+        $params['results'] = $smarty->_read_file($_cache_file);
+    }
+
+    if (empty($params['results'])) {
+        // nothing to parse (error?), regenerate cache
+        return false;
+    }
+
+    $_contents = $params['results'];
+    $_info_start = strpos($_contents, "\n") + 1;
+    $_info_len = (int)substr($_contents, 0, $_info_start - 1);
+    $_cache_info = unserialize(substr($_contents, $_info_start, $_info_len));
+    $params['results'] = substr($_contents, $_info_start + $_info_len);
+
+    if ($smarty->caching == 2 && isset ($_cache_info['expires'])){
+        // caching by expiration time
+        if ($_cache_info['expires'] > -1 && (time() > $_cache_info['expires'])) {
+            // cache expired, regenerate
+            return false;
+        }
+    } else {
+        // caching by lifetime
+        if ($smarty->cache_lifetime > -1 && (time() - $_cache_info['timestamp'] > $smarty->cache_lifetime)) {
+            // cache expired, regenerate
+            return false;
+        }
+    }
+
+    if ($smarty->compile_check) {
+        $_params = array('get_source' => false, 'quiet'=>true);
+        foreach (array_keys($_cache_info['template']) as $_template_dep) {
+            $_params['resource_name'] = $_template_dep;
+            if (!$smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
+                // template file has changed, regenerate cache
+                return false;
+            }
+        }
+
+        if (isset($_cache_info['config'])) {
+            $_params = array('resource_base_path' => $smarty->config_dir, 'get_source' => false, 'quiet'=>true);
+            foreach (array_keys($_cache_info['config']) as $_config_dep) {
+                $_params['resource_name'] = $_config_dep;
+                if (!$smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
+                    // config file has changed, regenerate cache
+                    return false;
+                }
+            }
+        }
+    }
+
+    $content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']] = array($params['results'], $_cache_info);
+
+    $smarty->_cache_info = $_cache_info;
+    return true;
+}
+
+/* vim: set expandtab: */
+
+?>