/**

 * 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;

                }

            }

        }

    }

    foreach ($_cache_info['cache_serials'] as $_include_file_path=>$_cache_serial) {

        if (empty($smarty->_cache_serials[$_include_file_path])) {

            $smarty->_include($_include_file_path, true);

        }

        if ($smarty->_cache_serials[$_include_file_path] != $_cache_serial) {

            /* regenerate */

            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: */

?>