githubFork/roundcubemail.git

			@@ -4,16 +4,20 @@
			+-----------------------------------------------------------------------+
			\| program/include/rcube_imap.php \|
			\| \|
			\| This file is part of the RoundCube Webmail client \|
			\| Copyright (C) 2005-2009, RoundCube Dev. - Switzerland \|
			\| Licensed under the GNU GPL \|
			\| This file is part of the Roundcube Webmail client \|
			\| Copyright (C) 2005-2012, The Roundcube Dev Team \|
			\| Copyright (C) 2011-2012, Kolab Systems AG \|
			\| \|
			\| Licensed under the GNU General Public License version 3 or \|
			\| any later version with exceptions for skins & plugins. \|
			\| See the README file for a full license statement. \|
			\| \|
			\| PURPOSE: \|
			\| IMAP wrapper that implements the Iloha IMAP Library (IIL) \|
			\| See http://ilohamail.org/ for details \|
			\| IMAP Storage Engine \|
			\| \|
			+-----------------------------------------------------------------------+
			\| Author: Thomas Bruederli <roundcube@gmail.com> \|
			\| Author: Aleksander Machniak <alec@alec.pl> \|
			+-----------------------------------------------------------------------+

			$Id$
			@@ -21,3257 +25,3971 @@
			*/


			/*
			* Obtain classes from the Iloha IMAP library
			*/
			require_once('lib/imap.inc');
			require_once('lib/mime.inc');
			require_once('lib/tnef_decoder.inc');


			/**
			* Interface class for accessing an IMAP server
			*
			* This is a wrapper that implements the Iloha IMAP Library (IIL)
			*
			* @package Mail
			* @author Thomas Bruederli <roundcube@gmail.com>
			* @version 1.5
			* @link http://ilohamail.org
			* @author Aleksander Machniak <alec@alec.pl>
			* @version 2.0
			*/
			class rcube_imap
			class rcube_imap extends rcube_storage
			{
			var $db;
			var $conn;
			var $root_ns = '';
			var $root_dir = '';
			var $mailbox = 'INBOX';
			var $list_page = 1;
			var $page_size = 10;
			var $sort_field = 'date';
			var $sort_order = 'DESC';
			var $index_sort = true;
			var $delimiter = NULL;
			var $caching_enabled = FALSE;
			var $default_charset = 'ISO-8859-1';
			var $struct_charset = NULL;
			var $default_folders = array('INBOX');
			var $fetch_add_headers = '';
			var $cache = array();
			var $cache_keys = array();
			var $cache_changes = array();
			var $uid_id_map = array();
			var $msg_headers = array();
			var $skip_deleted = FALSE;
			var $search_set = NULL;
			var $search_string = '';
			var $search_charset = '';
			var $search_sort_field = '';
			var $debug_level = 1;
			var $error_code = 0;
			var $options = array('auth_method' => 'check');

			private $host, $user, $pass, $port, $ssl;
			/**
			* Instance of rcube_imap_generic
			*
			* @var rcube_imap_generic
			*/
			public $conn;

			/**
			* Instance of rcube_imap_cache
			*
			* @var rcube_imap_cache
			*/
			protected $mcache;

			/**
			* Instance of rcube_cache
			*
			* @var rcube_cache
			*/
			protected $cache;

			/**
			* Internal (in-memory) cache
			*
			* @var array
			*/
			protected $icache = array();

			protected $list_page = 1;
			protected $delimiter;
			protected $namespace;
			protected $sort_field = '';
			protected $sort_order = 'DESC';
			protected $struct_charset;
			protected $uid_id_map = array();
			protected $msg_headers = array();
			protected $search_set;
			protected $search_string = '';
			protected $search_charset = '';
			protected $search_sort_field = '';
			protected $search_threads = false;
			protected $search_sorted = false;
			protected $options = array('auth_method' => 'check');
			protected $caching = false;
			protected $messages_caching = false;
			protected $threading = false;


			/**
			* Object constructor
			*
			* @param object DB Database connection
			*/
			function __construct($db_conn)
			/**
			* Object constructor.
			*/
			public function __construct()
			{
			$this->db = $db_conn;
			}
			$this->conn = new rcube_imap_generic();


			/**
			* Connect to an IMAP server
			*
			* @param string Host to connect
			* @param string Username for IMAP account
			* @param string Password for IMAP account
			* @param number Port to connect to
			* @param string SSL schema (either ssl or tls) or null if plain connection
			* @return boolean TRUE on success, FALSE on failure
			* @access public
			*/
			function connect($host, $user, $pass, $port=143, $use_ssl=null)
			{
			global $ICL_SSL, $ICL_PORT, $IMAP_USE_INTERNAL_DATE;

			// check for Open-SSL support in PHP build
			if ($use_ssl && extension_loaded('openssl'))
			$ICL_SSL = $use_ssl == 'imaps' ? 'ssl' : $use_ssl;
			else if ($use_ssl) {
			raise_error(array('code' => 403, 'type' => 'imap',
			'file' => __FILE__, 'line' => __LINE__,
			'message' => "Open SSL not available"), TRUE, FALSE);
			$port = 143;
			}

			$ICL_PORT = $port;
			$IMAP_USE_INTERNAL_DATE = false;

			$attempt = 0;
			do {
			$data = rcmail::get_instance()->plugins->exec_hook('imap_connect', array('host' => $host, 'user' => $user, 'attempt' => ++$attempt));
			if (!empty($data['pass']))
			$pass = $data['pass'];

			$this->conn = iil_Connect($data['host'], $data['user'], $pass, $this->options);
			} while(!$this->conn && $data['retry']);

			$this->host = $data['host'];
			$this->user = $data['user'];
			$this->pass = $pass;
			$this->port = $port;
			$this->ssl = $use_ssl;

			// print trace messages
			if ($this->conn && ($this->debug_level & 8))
			console($this->conn->message);

			// write error log
			else if (!$this->conn && $GLOBALS['iil_error'])
			{
			$this->error_code = $GLOBALS['iil_errornum'];
			raise_error(array('code' => 403, 'type' => 'imap',
			'file' => __FILE__, 'line' => __LINE__,
			'message' => $GLOBALS['iil_error']), TRUE, FALSE);
			}

			// get server properties
			if ($this->conn)
			{
			if (!empty($this->conn->rootdir))
			{
			$this->set_rootdir($this->conn->rootdir);
			$this->root_ns = preg_replace('/[.\/]$/', '', $this->conn->rootdir);
			// Set namespace and delimiter from session,
			// so some methods would work before connection
			if (isset($_SESSION['imap_namespace'])) {
			$this->namespace = $_SESSION['imap_namespace'];
			}
			if (empty($this->delimiter))
			$this->get_hierarchy_delimiter();
			}

			return $this->conn ? TRUE : FALSE;
			if (isset($_SESSION['imap_delimiter'])) {
			$this->delimiter = $_SESSION['imap_delimiter'];
			}
			}


			/**
			* Close IMAP connection
			* Usually done on script shutdown
			*
			* @access public
			*/
			function close()
			{
			if ($this->conn)
			iil_Close($this->conn);
			}


			/**
			* Close IMAP connection and re-connect
			* This is used to avoid some strange socket errors when talking to Courier IMAP
			*
			* @access public
			*/
			function reconnect()
			/**
			* Magic getter for backward compat.
			*
			* @deprecated.
			*/
			public function __get($name)
			{
			$this->close();
			$this->connect($this->host, $this->user, $this->pass, $this->port, $this->ssl);

			// issue SELECT command to restore connection status
			if ($this->mailbox)
			iil_C_Select($this->conn, $this->mailbox);
			if (isset($this->{$name})) {
			return $this->{$name};
			}
			}

			/**
			* Set options to be used in iil_Connect()
			*/
			function set_options($opt)
			{
			$this->options = array_merge($this->options, (array)$opt);
			}

			/**
			* Set a root folder for the IMAP connection.
			*
			* Only folders within this root folder will be displayed
			* and all folder paths will be translated using this folder name
			*
			* @param string Root folder
			* @access public
			*/
			function set_rootdir($root)
			/**
			* Connect to an IMAP server
			*
			* @param string $host Host to connect
			* @param string $user Username for IMAP account
			* @param string $pass Password for IMAP account
			* @param integer $port Port to connect to
			* @param string $use_ssl SSL schema (either ssl or tls) or null if plain connection
			*
			* @return boolean TRUE on success, FALSE on failure
			*/
			public function connect($host, $user, $pass, $port=143, $use_ssl=null)
			{
			if (preg_match('/[.\/]$/', $root)) //(substr($root, -1, 1)==='/')
			$root = substr($root, 0, -1);
			// check for OpenSSL support in PHP build
			if ($use_ssl && extension_loaded('openssl')) {
			$this->options['ssl_mode'] = $use_ssl == 'imaps' ? 'ssl' : $use_ssl;
			}
			else if ($use_ssl) {
			raise_error(array('code' => 403, 'type' => 'imap',
			'file' => __FILE__, 'line' => __LINE__,
			'message' => "OpenSSL not available"), true, false);
			$port = 143;
			}

			$this->root_dir = $root;
			$this->options['rootdir'] = $root;

			if (empty($this->delimiter))
			$this->get_hierarchy_delimiter();
			$this->options['port'] = $port;

			if ($this->options['debug']) {
			$this->set_debug(true);

			$this->options['ident'] = array(
			'name' => 'Roundcube Webmail',
			'version' => RCMAIL_VERSION,
			'php' => PHP_VERSION,
			'os' => PHP_OS,
			'command' => $_SERVER['REQUEST_URI'],
			);
			}

			$attempt = 0;
			do {
			$data = rcmail::get_instance()->plugins->exec_hook('imap_connect',
			array_merge($this->options, array('host' => $host, 'user' => $user,
			'attempt' => ++$attempt)));

			if (!empty($data['pass'])) {
			$pass = $data['pass'];
			}

			$this->conn->connect($data['host'], $data['user'], $pass, $data);
			} while(!$this->conn->connected() && $data['retry']);

			$config = array(
			'host' => $data['host'],
			'user' => $data['user'],
			'password' => $pass,
			'port' => $port,
			'ssl' => $use_ssl,
			);

			$this->options = array_merge($this->options, $config);
			$this->connect_done = true;

			if ($this->conn->connected()) {
			// get namespace and delimiter
			$this->set_env();
			return true;
			}
			// write error log
			else if ($this->conn->error) {
			if ($pass && $user) {
			$message = sprintf("Login failed for %s from %s. %s",
			$user, rcmail_remote_ip(), $this->conn->error);

			raise_error(array('code' => 403, 'type' => 'imap',
			'file' => __FILE__, 'line' => __LINE__,
			'message' => $message), true, false);
			}
			}

			return false;
			}


			/**
			* Set default message charset
			*
			* This will be used for message decoding if a charset specification is not available
			*
			* @param string Charset string
			* @access public
			*/
			function set_charset($cs)
			/**
			* Close IMAP connection.
			* Usually done on script shutdown
			*/
			public function close()
			{
			$this->default_charset = $cs;
			$this->conn->closeConnection();
			if ($this->mcache) {
			$this->mcache->close();
			}
			}


			/**
			* This list of folders will be listed above all other folders
			*
			* @param array Indexed list of folder names
			* @access public
			*/
			function set_default_mailboxes($arr)
			/**
			* Check connection state, connect if not connected.
			*
			* @return bool Connection state.
			*/
			public function check_connection()
			{
			if (is_array($arr))
			{
			$this->default_folders = $arr;
			// Establish connection if it wasn't done yet
			if (!$this->connect_done && !empty($this->options['user'])) {
			return $this->connect(
			$this->options['host'],
			$this->options['user'],
			$this->options['password'],
			$this->options['port'],
			$this->options['ssl']
			);
			}

			// add inbox if not included
			if (!in_array('INBOX', $this->default_folders))
			array_unshift($this->default_folders, 'INBOX');
			}
			return $this->is_connected();
			}


			/**
			* Set internal mailbox reference.
			*
			* All operations will be perfomed on this mailbox/folder
			*
			* @param string Mailbox/Folder name
			* @access public
			*/
			function set_mailbox($new_mbox)
			/**
			* Checks IMAP connection.
			*
			* @return boolean TRUE on success, FALSE on failure
			*/
			public function is_connected()
			{
			$mailbox = $this->mod_mailbox($new_mbox);

			if ($this->mailbox == $mailbox)
			return;

			$this->mailbox = $mailbox;

			// clear messagecount cache for this mailbox
			$this->_clear_messagecount($mailbox);
			return $this->conn->connected();
			}


			/**
			* Set internal list page
			*
			* @param number Page number to list
			* @access public
			*/
			function set_page($page)
			/**
			* Returns code of last error
			*
			* @return int Error code
			*/
			public function get_error_code()
			{
			$this->list_page = (int)$page;
			return $this->conn->errornum;
			}


			/**
			* Set internal page size
			*
			* @param number Number of messages to display on one page
			* @access public
			*/
			function set_pagesize($size)
			/**
			* Returns text of last error
			*
			* @return string Error string
			*/
			public function get_error_str()
			{
			$this->page_size = (int)$size;
			return $this->conn->error;
			}


			/**
			* Save a set of message ids for future message listing methods
			*
			* @param string IMAP Search query
			* @param array List of message ids or NULL if empty
			* @param string Charset of search string
			* @param string Sorting field
			*/
			function set_search_set($str=null, $msgs=null, $charset=null, $sort_field=null)

			/**
			* Returns code of last command response
			*
			* @return int Response code
			*/
			public function get_response_code()
			{
			if (is_array($str) && $msgs == null)
			list($str, $msgs, $charset, $sort_field) = $str;
			if ($msgs != null && !is_array($msgs))
			$msgs = explode(',', $msgs);

			$this->search_string = $str;
			$this->search_set = $msgs;
			$this->search_charset = $charset;
			$this->search_sort_field = $sort_field;
			switch ($this->conn->resultcode) {
			case 'NOPERM':
			return self::NOPERM;
			case 'READ-ONLY':
			return self::READONLY;
			case 'TRYCREATE':
			return self::TRYCREATE;
			case 'INUSE':
			return self::INUSE;
			case 'OVERQUOTA':
			return self::OVERQUOTA;
			case 'ALREADYEXISTS':
			return self::ALREADYEXISTS;
			case 'NONEXISTENT':
			return self::NONEXISTENT;
			case 'CONTACTADMIN':
			return self::CONTACTADMIN;
			default:
			return self::UNKNOWN;
			}
			}


			/**
			* Return the saved search set as hash array
			* @return array Search set
			*/
			function get_search_set()
			/**
			* Activate/deactivate debug mode
			*
			* @param boolean $dbg True if IMAP conversation should be logged
			*/
			public function set_debug($dbg = true)
			{
			return array($this->search_string, $this->search_set, $this->search_charset, $this->search_sort_field);
			$this->options['debug'] = $dbg;
			$this->conn->setDebug($dbg, array($this, 'debug_handler'));
			}


			/**
			* Returns the currently used mailbox name
			*
			* @return string Name of the mailbox/folder
			* @access public
			*/
			function get_mailbox_name()
			/**
			* Set internal folder reference.
			* All operations will be perfomed on this folder.
			*
			* @param string $folder Folder name
			*/
			public function set_folder($folder)
			{
			return $this->conn ? $this->mod_mailbox($this->mailbox, 'out') : '';
			if ($this->folder == $folder) {
			return;
			}

			$this->folder = $folder;

			// clear messagecount cache for this folder
			$this->clear_messagecount($folder);
			}


			/**
			* Returns the IMAP server's capability
			*
			* @param string Capability name
			* @return mixed Capability value or TRUE if supported, FALSE if not
			* @access public
			*/
			function get_capability($cap)
			/**
			* Save a search result for future message listing methods
			*
			* @param array $set Search set, result from rcube_imap::get_search_set():
			* 0 - searching criteria, string
			* 1 - search result, rcube_result_index\|rcube_result_thread
			* 2 - searching character set, string
			* 3 - sorting field, string
			* 4 - true if sorted, bool
			*/
			public function set_search_set($set)
			{
			return iil_C_GetCapability($this->conn, strtoupper($cap));
			$set = (array)$set;

			$this->search_string = $set[0];
			$this->search_set = $set[1];
			$this->search_charset = $set[2];
			$this->search_sort_field = $set[3];
			$this->search_sorted = $set[4];
			$this->search_threads = is_a($this->search_set, 'rcube_result_thread');
			}


			/**
			* Checks the PERMANENTFLAGS capability of the current mailbox
			* and returns true if the given flag is supported by the IMAP server
			*
			* @param string Permanentflag name
			* @return mixed True if this flag is supported
			* @access public
			*/
			function check_permflag($flag)
			/**
			* Return the saved search set as hash array
			*
			* @return array Search set
			*/
			public function get_search_set()
			{
			$flag = strtoupper($flag);
			$imap_flag = $GLOBALS['IMAP_FLAGS'][$flag];
			return (in_array_nocase($imap_flag, $this->conn->permanentflags));
			if (empty($this->search_set)) {
			return null;
			}

			return array(
			$this->search_string,
			$this->search_set,
			$this->search_charset,
			$this->search_sort_field,
			$this->search_sorted,
			);
			}


			/**
			* Returns the delimiter that is used by the IMAP server for folder separation
			*
			* @return string Delimiter string
			* @access public
			*/
			function get_hierarchy_delimiter()
			/**
			* Returns the IMAP server's capability.
			*
			* @param string $cap Capability name
			*
			* @return mixed Capability value or TRUE if supported, FALSE if not
			*/
			public function get_capability($cap)
			{
			if ($this->conn && empty($this->delimiter))
			$this->delimiter = iil_C_GetHierarchyDelimiter($this->conn);
			$cap = strtoupper($cap);
			$sess_key = "STORAGE_$cap";

			if (empty($this->delimiter))
			$this->delimiter = '/';
			if (!isset($_SESSION[$sess_key])) {
			if (!$this->check_connection()) {
			return false;
			}

			return $this->delimiter;
			$_SESSION[$sess_key] = $this->conn->getCapability($cap);
			}

			return $_SESSION[$sess_key];
			}


			/**
			* Public method for mailbox listing.
			*
			* Converts mailbox name with root dir first
			*
			* @param string Optional root folder
			* @param string Optional filter for mailbox listing
			* @return array List of mailboxes/folders
			* @access public
			*/
			function list_mailboxes($root='', $filter='*')
			/**
			* Checks the PERMANENTFLAGS capability of the current folder
			* and returns true if the given flag is supported by the IMAP server
			*
			* @param string $flag Permanentflag name
			*
			* @return boolean True if this flag is supported
			*/
			public function check_permflag($flag)
			{
			$a_out = array();
			$a_mboxes = $this->_list_mailboxes($root, $filter);
			$flag = strtoupper($flag);
			$imap_flag = $this->conn->flags[$flag];

			foreach ($a_mboxes as $mbox_row)
			{
			$name = $this->mod_mailbox($mbox_row, 'out');
			if (strlen($name))
			$a_out[] = $name;
			}
			if ($this->folder !== null) {
			$this->check_connection();
			}
			// @TODO: cache permanent flags (?)

			// INBOX should always be available
			if (!in_array('INBOX', $a_out))
			array_unshift($a_out, 'INBOX');

			// sort mailboxes
			$a_out = $this->_sort_mailbox_list($a_out);

			return $a_out;
			return (in_array_nocase($imap_flag, $this->conn->data['PERMANENTFLAGS']));
			}


			/**
			* Private method for mailbox listing
			*
			* @return array List of mailboxes/folders
			* @see rcube_imap::list_mailboxes()
			* @access private
			*/
			private function _list_mailboxes($root='', $filter='*')
			/**
			* Returns the delimiter that is used by the IMAP server for folder separation
			*
			* @return string Delimiter string
			* @access public
			*/
			public function get_hierarchy_delimiter()
			{
			$a_defaults = $a_out = array();

			// get cached folder list
			$a_mboxes = $this->get_cache('mailboxes');
			if (is_array($a_mboxes))
			return $a_mboxes;

			// Give plugins a chance to provide a list of mailboxes
			$data = rcmail::get_instance()->plugins->exec_hook('list_mailboxes',array('root'=>$root,'filter'=>$filter));
			if (isset($data['folders'])) {
			$a_folders = $data['folders'];
			}
			else{
			// retrieve list of folders from IMAP server
			$a_folders = iil_C_ListSubscribed($this->conn, $this->mod_mailbox($root), $filter);
			}


			if (!is_array($a_folders) \|\| !sizeof($a_folders))
			$a_folders = array();

			// write mailboxlist to cache
			$this->update_cache('mailboxes', $a_folders);

			return $a_folders;
			return $this->delimiter;
			}


			/**
			* Get message count for a specific mailbox
			*
			* @param string Mailbox/folder name
			* @param string Mode for count [ALL\|UNSEEN\|RECENT]
			* @param boolean Force reading from server and update cache
			* @return int Number of messages
			* @access public
			*/
			function messagecount($mbox_name='', $mode='ALL', $force=FALSE)
			/**
			* Get namespace
			*
			* @param string $name Namespace array index: personal, other, shared, prefix
			*
			* @return array Namespace data
			*/
			public function get_namespace($name = null)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			return $this->_messagecount($mailbox, $mode, $force);
			$ns = $this->namespace;

			if ($name) {
			return isset($ns[$name]) ? $ns[$name] : null;
			}

			unset($ns['prefix']);
			return $ns;
			}


			/**
			* Private method for getting nr of messages
			*
			* @access private
			* @see rcube_imap::messagecount()
			*/
			private function _messagecount($mailbox='', $mode='ALL', $force=FALSE)
			/**
			* Sets delimiter and namespaces
			*/
			protected function set_env()
			{
			$mode = strtoupper($mode);
			if ($this->delimiter !== null && $this->namespace !== null) {
			return;
			}

			if (empty($mailbox))
			$mailbox = $this->mailbox;

			// count search set
			if ($this->search_string && $mailbox == $this->mailbox && $mode == 'ALL' && !$force)
			return count((array)$this->search_set);
			$config = rcmail::get_instance()->config;
			$imap_personal = $config->get('imap_ns_personal');
			$imap_other = $config->get('imap_ns_other');
			$imap_shared = $config->get('imap_ns_shared');
			$imap_delimiter = $config->get('imap_delimiter');

			$a_mailbox_cache = $this->get_cache('messagecount');

			// return cached value
			if (!$force && is_array($a_mailbox_cache[$mailbox]) && isset($a_mailbox_cache[$mailbox][$mode]))
			return $a_mailbox_cache[$mailbox][$mode];
			if (!$this->check_connection()) {
			return;
			}

			if (!is_array($a_mailbox_cache[$mailbox]))
			$a_mailbox_cache[$mailbox] = array();
			$ns = $this->conn->getNamespace();

			// RECENT count is fetched a bit different
			if ($mode == 'RECENT')
			$count = iil_C_CheckForRecent($this->conn, $mailbox);
			// Set namespaces (NAMESPACE supported)
			if (is_array($ns)) {
			$this->namespace = $ns;
			}
			else {
			$this->namespace = array(
			'personal' => NULL,
			'other' => NULL,
			'shared' => NULL,
			);
			}

			// use SEARCH for message counting
			else if ($this->skip_deleted)
			{
			$search_str = "ALL UNDELETED";
			if ($imap_delimiter) {
			$this->delimiter = $imap_delimiter;
			}
			if (empty($this->delimiter)) {
			$this->delimiter = $this->namespace['personal'][0][1];
			}
			if (empty($this->delimiter)) {
			$this->delimiter = $this->conn->getHierarchyDelimiter();
			}
			if (empty($this->delimiter)) {
			$this->delimiter = '/';
			}

			// get message count and store in cache
			if ($mode == 'UNSEEN')
			$search_str .= " UNSEEN";
			// Overwrite namespaces
			if ($imap_personal !== null) {
			$this->namespace['personal'] = NULL;
			foreach ((array)$imap_personal as $dir) {
			$this->namespace['personal'][] = array($dir, $this->delimiter);
			}
			}
			if ($imap_other !== null) {
			$this->namespace['other'] = NULL;
			foreach ((array)$imap_other as $dir) {
			if ($dir) {
			$this->namespace['other'][] = array($dir, $this->delimiter);
			}
			}
			}
			if ($imap_shared !== null) {
			$this->namespace['shared'] = NULL;
			foreach ((array)$imap_shared as $dir) {
			if ($dir) {
			$this->namespace['shared'][] = array($dir, $this->delimiter);
			}
			}
			}

			// get message count using SEARCH
			// not very performant but more precise (using UNDELETED)
			$index = $this->_search_index($mailbox, $search_str);
			$count = is_array($index) ? count($index) : 0;
			}
			else {
			if ($mode == 'UNSEEN')
			$count = iil_C_CountUnseen($this->conn, $mailbox);
			else {
			$count = iil_C_CountMessages($this->conn, $mailbox);
			$_SESSION['maxuid'][$mailbox] = $count ? $this->_id2uid($count) : 0;
			}
			}
			// Find personal namespace prefix for mod_folder()
			// Prefix can be removed when there is only one personal namespace
			if (is_array($this->namespace['personal']) && count($this->namespace['personal']) == 1) {
			$this->namespace['prefix'] = $this->namespace['personal'][0][0];
			}

			$a_mailbox_cache[$mailbox][$mode] = (int)$count;

			// write back to cache
			$this->update_cache('messagecount', $a_mailbox_cache);

			return (int)$count;
			$_SESSION['imap_namespace'] = $this->namespace;
			$_SESSION['imap_delimiter'] = $this->delimiter;
			}


			/**
			* Public method for listing headers
			* convert mailbox name with root dir first
			*
			* @param string Mailbox/folder name
			* @param int Current page to list
			* @param string Header field to sort by
			* @param string Sort order [ASC\|DESC]
			* @param boolean Number of slice items to extract from result array
			* @return array Indexed array with message header objects
			* @access public
			*/
			function list_headers($mbox_name='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
			/**
			* Get message count for a specific folder
			*
			* @param string $folder Folder name
			* @param string $mode Mode for count [ALL\|THREADS\|UNSEEN\|RECENT]
			* @param boolean $force Force reading from server and update cache
			* @param boolean $status Enables storing folder status info (max UID/count),
			* required for folder_status()
			*
			* @return int Number of messages
			*/
			public function count($folder='', $mode='ALL', $force=false, $status=true)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			return $this->_list_headers($mailbox, $page, $sort_field, $sort_order, false, $slice);
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			return $this->messagecount($folder, $mode, $force, $status);
			}


			/**
			* Private method for listing message headers
			*
			* @access private
			* @see rcube_imap::list_headers
			*/
			private function _list_headers($mailbox='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $recursive=FALSE, $slice=0)
			/**
			* protected method for getting nr of messages
			*
			* @param string $folder Folder name
			* @param string $mode Mode for count [ALL\|THREADS\|UNSEEN\|RECENT]
			* @param boolean $force Force reading from server and update cache
			* @param boolean $status Enables storing folder status info (max UID/count),
			* required for folder_status()
			*
			* @return int Number of messages
			* @see rcube_imap::count()
			*/
			protected function messagecount($folder, $mode='ALL', $force=false, $status=true)
			{
			if (!strlen($mailbox))
			return array();
			$mode = strtoupper($mode);

			// use saved message set
			if ($this->search_string && $mailbox == $this->mailbox)
			return $this->_list_header_set($mailbox, $page, $sort_field, $sort_order, $slice);
			// count search set, assume search set is always up-to-date (don't check $force flag)
			if ($this->search_string && $folder == $this->folder && ($mode == 'ALL' \|\| $mode == 'THREADS')) {
			if ($mode == 'ALL') {
			return $this->search_set->count_messages();
			}
			else {
			return $this->search_set->count();
			}
			}

			$this->_set_sort_order($sort_field, $sort_order);
			$a_folder_cache = $this->get_cache('messagecount');

			$page = $page ? $page : $this->list_page;
			$cache_key = $mailbox.'.msg';
			$cache_status = $this->check_cache_status($mailbox, $cache_key);
			// return cached value
			if (!$force && is_array($a_folder_cache[$folder]) && isset($a_folder_cache[$folder][$mode])) {
			return $a_folder_cache[$folder][$mode];
			}

			// cache is OK, we can get all messages from local cache
			if ($cache_status>0)
			{
			$start_msg = ($page-1) * $this->page_size;
			$a_msg_headers = $this->get_message_cache($cache_key, $start_msg, $start_msg+$this->page_size, $this->sort_field, $this->sort_order);
			$result = array_values($a_msg_headers);
			if ($slice)
			$result = array_slice($result, -$slice, $slice);
			return $result;
			}
			// cache is dirty, sync it
			else if ($this->caching_enabled && $cache_status==-1 && !$recursive)
			{
			$this->sync_header_index($mailbox);
			return $this->_list_headers($mailbox, $page, $this->sort_field, $this->sort_order, TRUE, $slice);
			}
			if (!is_array($a_folder_cache[$folder])) {
			$a_folder_cache[$folder] = array();
			}

			// retrieve headers from IMAP
			$a_msg_headers = array();
			if ($mode == 'THREADS') {
			$res = $this->fetch_threads($folder, $force);
			$count = $res->count();

			// use message index sort for sorting by Date (for better performance)
			if ($this->index_sort && $this->sort_field == 'date')
			{
			if ($this->skip_deleted) {
			// @TODO: this could be cached
			if ($msg_index = $this->_search_index($mailbox, 'ALL UNDELETED')) {
			$max = max($msg_index);
			list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
			$msg_index = array_slice($msg_index, $begin, $end-$begin);
			}
			} else if ($max = iil_C_CountMessages($this->conn, $mailbox)) {
			list($begin, $end) = $this->_get_message_range($max, $page);
			$msg_index = range($begin+1, $end);
			} else
			$msg_index = array();
			if ($status) {
			$msg_count = $res->count_messages();
			$this->set_folder_stats($folder, 'cnt', $msg_count);
			$this->set_folder_stats($folder, 'maxuid', $msg_count ? $this->id2uid($msg_count, $folder) : 0);
			}
			}
			// Need connection here
			else if (!$this->check_connection()) {
			return 0;
			}
			// RECENT count is fetched a bit different
			else if ($mode == 'RECENT') {
			$count = $this->conn->countRecent($folder);
			}
			// use SEARCH for message counting
			else if (!empty($this->options['skip_deleted'])) {
			$search_str = "ALL UNDELETED";
			$keys = array('COUNT');

			if ($slice)
			$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
			if ($mode == 'UNSEEN') {
			$search_str .= " UNSEEN";
			}
			else {
			if ($this->messages_caching) {
			$keys[] = 'ALL';
			}
			if ($status) {
			$keys[] = 'MAX';
			}
			}

			// fetch reqested headers from server
			if ($msg_index)
			$this->_fetch_headers($mailbox, join(",", $msg_index), $a_msg_headers, $cache_key);
			}
			// use SORT command
			else if ($this->get_capability('sort') && ($msg_index = iil_C_Sort($this->conn, $mailbox, $this->sort_field, $this->skip_deleted ? 'UNDELETED' : '')))
			{
			list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
			$max = max($msg_index);
			$msg_index = array_slice($msg_index, $begin, $end-$begin);
			// @TODO: if $force==false && $mode == 'ALL' we could try to use cache index here

			if ($slice)
			$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
			// get message count using (E)SEARCH
			// not very performant but more precise (using UNDELETED)
			$index = $this->conn->search($folder, $search_str, true, $keys);
			$count = $index->count();

			// fetch reqested headers from server
			$this->_fetch_headers($mailbox, join(',', $msg_index), $a_msg_headers, $cache_key);
			}
			// fetch specified header for all messages and sort
			else if ($a_index = iil_C_FetchHeaderIndex($this->conn, $mailbox, "1:*", $this->sort_field, $this->skip_deleted))
			{
			asort($a_index); // ASC
			$msg_index = array_keys($a_index);
			$max = max($msg_index);
			list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
			$msg_index = array_slice($msg_index, $begin, $end-$begin);
			if ($mode == 'ALL') {
			// Cache index data, will be used in index_direct()
			$this->icache['undeleted_idx'] = $index;

			if ($slice)
			$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
			if ($status) {
			$this->set_folder_stats($folder, 'cnt', $count);
			$this->set_folder_stats($folder, 'maxuid', $index->max());
			}
			}
			}
			else {
			if ($mode == 'UNSEEN') {
			$count = $this->conn->countUnseen($folder);
			}
			else {
			$count = $this->conn->countMessages($folder);
			if ($status) {
			$this->set_folder_stats($folder,'cnt', $count);
			$this->set_folder_stats($folder, 'maxuid', $count ? $this->id2uid($count, $folder) : 0);
			}
			}
			}

			// fetch reqested headers from server
			$this->_fetch_headers($mailbox, join(",", $msg_index), $a_msg_headers, $cache_key);
			}
			$a_folder_cache[$folder][$mode] = (int)$count;

			// delete cached messages with a higher index than $max+1
			// Changed $max to $max+1 to fix this bug : #1484295
			$this->clear_message_cache($cache_key, $max + 1);
			// write back to cache
			$this->update_cache('messagecount', $a_folder_cache);

			// kick child process to sync cache
			// ...

			// return empty array if no messages found
			if (!is_array($a_msg_headers) \|\| empty($a_msg_headers))
			return array();

			// use this class for message sorting
			$sorter = new rcube_header_sorter();
			$sorter->set_sequence_numbers($msg_index);
			$sorter->sort_headers($a_msg_headers);

			if ($this->sort_order == 'DESC')
			$a_msg_headers = array_reverse($a_msg_headers);

			return array_values($a_msg_headers);
			return (int)$count;
			}


			/**
			* Private method for listing a set of message headers (search results)
			*
			* @param string Mailbox/folder name
			* @param int Current page to list
			* @param string Header field to sort by
			* @param string Sort order [ASC\|DESC]
			* @param boolean Number of slice items to extract from result array
			* @return array Indexed array with message header objects
			* @access private
			* @see rcube_imap::list_header_set()
			*/
			private function _list_header_set($mailbox, $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
			/**
			* Public method for listing headers
			*
			* @param string $folder Folder name
			* @param int $page Current page to list
			* @param string $sort_field Header field to sort by
			* @param string $sort_order Sort order [ASC\|DESC]
			* @param int $slice Number of slice items to extract from result array
			*
			* @return array Indexed array with message header objects
			*/
			public function list_messages($folder='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
			{
			if (!strlen($mailbox) \|\| empty($this->search_set))
			return array();
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			$msgs = $this->search_set;
			$a_msg_headers = array();
			$page = $page ? $page : $this->list_page;
			$start_msg = ($page-1) * $this->page_size;
			return $this->_list_messages($folder, $page, $sort_field, $sort_order, $slice);
			}

			$this->_set_sort_order($sort_field, $sort_order);

			// quickest method
			if ($this->index_sort && $this->search_sort_field == 'date' && $this->sort_field == 'date')
			{
			if ($sort_order == 'DESC')
			$msgs = array_reverse($msgs);
			/**
			* protected method for listing message headers
			*
			* @param string $folder Folder name
			* @param int $page Current page to list
			* @param string $sort_field Header field to sort by
			* @param string $sort_order Sort order [ASC\|DESC]
			* @param int $slice Number of slice items to extract from result array
			*
			* @return array Indexed array with message header objects
			* @see rcube_imap::list_messages
			*/
			protected function _list_messages($folder='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
			{
			if (!strlen($folder)) {
			return array();
			}

			// get messages uids for one page
			$msgs = array_slice(array_values($msgs), $start_msg, min(count($msgs)-$start_msg, $this->page_size));
			$this->set_sort_order($sort_field, $sort_order);
			$page = $page ? $page : $this->list_page;

			if ($slice)
			$msgs = array_slice($msgs, -$slice, $slice);
			// use saved message set
			if ($this->search_string && $folder == $this->folder) {
			return $this->list_search_messages($folder, $page, $slice);
			}

			// fetch headers
			$this->_fetch_headers($mailbox, join(',',$msgs), $a_msg_headers, NULL);
			if ($this->threading) {
			return $this->list_thread_messages($folder, $page, $slice);
			}

			// I didn't found in RFC that FETCH always returns messages sorted by index
			$sorter = new rcube_header_sorter();
			$sorter->set_sequence_numbers($msgs);
			$sorter->sort_headers($a_msg_headers);
			// get UIDs of all messages in the folder, sorted
			$index = $this->index($folder, $this->sort_field, $this->sort_order);

			return array_values($a_msg_headers);
			}
			// sorted messages, so we can first slice array and then fetch only wanted headers
			if ($this->get_capability('sort') && (!$this->index_sort \|\| $this->sort_field != 'date')) // SORT searching result
			{
			// reset search set if sorting field has been changed
			if ($this->sort_field && $this->search_sort_field != $this->sort_field)
			$msgs = $this->search('', $this->search_string, $this->search_charset, $this->sort_field);
			if ($index->is_empty()) {
			return array();
			}

			// return empty array if no messages found
			if (empty($msgs))
			return array();
			$from = ($page-1) * $this->page_size;
			$to = $from + $this->page_size;

			if ($sort_order == 'DESC')
			$msgs = array_reverse($msgs);
			$index->slice($from, $to - $from);

			// get messages uids for one page
			$msgs = array_slice(array_values($msgs), $start_msg, min(count($msgs)-$start_msg, $this->page_size));
			if ($slice) {
			$index->slice(-$slice, $slice);
			}

			if ($slice)
			$msgs = array_slice($msgs, -$slice, $slice);

			// fetch headers
			$this->_fetch_headers($mailbox, join(',',$msgs), $a_msg_headers, NULL);

			$sorter = new rcube_header_sorter();
			$sorter->set_sequence_numbers($msgs);
			$sorter->sort_headers($a_msg_headers);

			return array_values($a_msg_headers);
			}
			else { // SEARCH searching result, need sorting
			$cnt = count($msgs);
			// 300: experimantal value for best result
			if (($cnt > 300 && $cnt > $this->page_size) \|\| ($this->index_sort && $this->sort_field == 'date')) {
			// use memory less expensive (and quick) method for big result set
			$a_index = $this->message_index('', $this->sort_field, $this->sort_order);
			// get messages uids for one page...
			$msgs = array_slice($a_index, $start_msg, min($cnt-$start_msg, $this->page_size));
			if ($slice)
			$msgs = array_slice($msgs, -$slice, $slice);
			// ...and fetch headers
			$this->_fetch_headers($mailbox, join(',', $msgs), $a_msg_headers, NULL);

			// return empty array if no messages found
			if (!is_array($a_msg_headers) \|\| empty($a_msg_headers))
			return array();

			$sorter = new rcube_header_sorter();
			$sorter->set_sequence_numbers($msgs);
			$sorter->sort_headers($a_msg_headers);
			// fetch reqested messages headers
			$a_index = $index->get();
			$a_msg_headers = $this->fetch_headers($folder, $a_index);

			return array_values($a_msg_headers);
			}


			/**
			* protected method for listing message headers using threads
			*
			* @param string $folder Folder name
			* @param int $page Current page to list
			* @param int $slice Number of slice items to extract from result array
			*
			* @return array Indexed array with message header objects
			* @see rcube_imap::list_messages
			*/
			protected function list_thread_messages($folder, $page, $slice=0)
			{
			// get all threads (not sorted)
			if ($mcache = $this->get_mcache_engine()) {
			$threads = $mcache->get_thread($folder);
			}
			else {
			// for small result set we can fetch all messages headers
			$this->_fetch_headers($mailbox, join(',', $msgs), $a_msg_headers, NULL);

			else {
			$threads = $this->fetch_threads($folder);
			}

			return $this->fetch_thread_headers($folder, $threads, $page, $slice);
			}

			/**
			* Method for fetching threads data
			*
			* @param string $folder Folder name
			* @param bool $force Use IMAP server, no cache
			*
			* @return rcube_imap_thread Thread data object
			*/
			function fetch_threads($folder, $force = false)
			{
			if (!$force && ($mcache = $this->get_mcache_engine())) {
			// don't store in self's internal cache, cache has it's own internal cache
			return $mcache->get_thread($folder);
			}

			if (empty($this->icache['threads'])) {
			if (!$this->check_connection()) {
			return new rcube_result_thread();
			}

			// get all threads
			$result = $this->conn->thread($folder, $this->threading,
			$this->options['skip_deleted'] ? 'UNDELETED' : '', true);

			// add to internal (fast) cache
			$this->icache['threads'] = $result;
			}

			return $this->icache['threads'];
			}


			/**
			* protected method for fetching threaded messages headers
			*
			* @param string $folder Folder name
			* @param rcube_result_thread $threads Threads data object
			* @param int $page List page number
			* @param int $slice Number of threads to slice
			*
			* @return array Messages headers
			*/
			protected function fetch_thread_headers($folder, $threads, $page, $slice=0)
			{
			// Sort thread structure
			$this->sort_threads($threads);

			$from = ($page-1) * $this->page_size;
			$to = $from + $this->page_size;

			$threads->slice($from, $to - $from);

			if ($slice) {
			$threads->slice(-$slice, $slice);
			}

			// Get UIDs of all messages in all threads
			$a_index = $threads->get();

			// fetch reqested headers from server
			$a_msg_headers = $this->fetch_headers($folder, $a_index);

			unset($a_index);

			// Set depth, has_children and unread_children fields in headers
			$this->set_thread_flags($a_msg_headers, $threads);

			return array_values($a_msg_headers);
			}


			/**
			* protected method for setting threaded messages flags:
			* depth, has_children and unread_children
			*
			* @param array $headers Reference to headers array indexed by message UID
			* @param rcube_imap_result $threads Threads data object
			*
			* @return array Message headers array indexed by message UID
			*/
			protected function set_thread_flags(&$headers, $threads)
			{
			$parents = array();

			list ($msg_depth, $msg_children) = $threads->get_thread_data();

			foreach ($headers as $uid => $header) {
			$depth = $msg_depth[$uid];
			$parents = array_slice($parents, 0, $depth);

			if (!empty($parents)) {
			$headers[$uid]->parent_uid = end($parents);
			if (empty($header->flags['SEEN']))
			$headers[$parents[0]]->unread_children++;
			}
			array_push($parents, $uid);

			$headers[$uid]->depth = $depth;
			$headers[$uid]->has_children = $msg_children[$uid];
			}
			}


			/**
			* protected method for listing a set of message headers (search results)
			*
			* @param string $folder Folder name
			* @param int $page Current page to list
			* @param int $slice Number of slice items to extract from result array
			*
			* @return array Indexed array with message header objects
			*/
			protected function list_search_messages($folder, $page, $slice=0)
			{
			if (!strlen($folder) \|\| empty($this->search_set) \|\| $this->search_set->is_empty()) {
			return array();
			}

			// use saved messages from searching
			if ($this->threading) {
			return $this->list_search_thread_messages($folder, $page, $slice);
			}

			// search set is threaded, we need a new one
			if ($this->search_threads) {
			$this->search('', $this->search_string, $this->search_charset, $this->sort_field);
			}

			$index = clone $this->search_set;
			$from = ($page-1) * $this->page_size;
			$to = $from + $this->page_size;

			// return empty array if no messages found
			if (!is_array($a_msg_headers) \|\| empty($a_msg_headers))
			return array();
			if ($index->is_empty()) {
			return array();
			}

			// if not already sorted
			$a_msg_headers = iil_SortHeaders($a_msg_headers, $this->sort_field, $this->sort_order);
			// quickest method (default sorting)
			if (!$this->search_sort_field && !$this->sort_field) {
			$got_index = true;
			}
			// sorted messages, so we can first slice array and then fetch only wanted headers
			else if ($this->search_sorted) { // SORT searching result
			$got_index = true;
			// reset search set if sorting field has been changed
			if ($this->sort_field && $this->search_sort_field != $this->sort_field) {
			$this->search('', $this->search_string, $this->search_charset, $this->sort_field);

			// only return the requested part of the set
			$a_msg_headers = array_slice(array_values($a_msg_headers), $start_msg, min($cnt-$start_msg, $this->page_size));
			if ($slice)
			$a_msg_headers = array_slice($a_msg_headers, -$slice, $slice);
			$index = clone $this->search_set;

			// return empty array if no messages found
			if ($index->is_empty()) {
			return array();
			}
			}
			}

			if ($got_index) {
			if ($this->sort_order != $index->get_parameters('ORDER')) {
			$index->revert();
			}

			// get messages uids for one page
			$index->slice($from, $to-$from);

			if ($slice) {
			$index->slice(-$slice, $slice);
			}

			// fetch headers
			$a_index = $index->get();
			$a_msg_headers = $this->fetch_headers($folder, $a_index);

			return array_values($a_msg_headers);
			}

			// SEARCH result, need sorting
			$cnt = $index->count();

			// 300: experimantal value for best result
			if (($cnt > 300 && $cnt > $this->page_size) \|\| !$this->sort_field) {
			// use memory less expensive (and quick) method for big result set
			$index = clone $this->index('', $this->sort_field, $this->sort_order);
			// get messages uids for one page...
			$index->slice($start_msg, min($cnt-$from, $this->page_size));

			if ($slice) {
			$index->slice(-$slice, $slice);
			}

			// ...and fetch headers
			$a_index = $index->get();
			$a_msg_headers = $this->fetch_headers($folder, $a_index);

			return array_values($a_msg_headers);
			}
			else {
			// for small result set we can fetch all messages headers
			$a_index = $index->get();
			$a_msg_headers = $this->fetch_headers($folder, $a_index, false);

			// return empty array if no messages found
			if (!is_array($a_msg_headers) \|\| empty($a_msg_headers)) {
			return array();
			}

			if (!$this->check_connection()) {
			return array();
			}

			// if not already sorted
			$a_msg_headers = $this->conn->sortHeaders(
			$a_msg_headers, $this->sort_field, $this->sort_order);

			// only return the requested part of the set
			$a_msg_headers = array_slice(array_values($a_msg_headers),
			$from, min($cnt-$to, $this->page_size));

			if ($slice) {
			$a_msg_headers = array_slice($a_msg_headers, -$slice, $slice);
			}

			return $a_msg_headers;
			}
			}


			/**
			* protected method for listing a set of threaded message headers (search results)
			*
			* @param string $folder Folder name
			* @param int $page Current page to list
			* @param int $slice Number of slice items to extract from result array
			*
			* @return array Indexed array with message header objects
			* @see rcube_imap::list_search_messages()
			*/
			protected function list_search_thread_messages($folder, $page, $slice=0)
			{
			// update search_set if previous data was fetched with disabled threading
			if (!$this->search_threads) {
			if ($this->search_set->is_empty()) {
			return array();
			}
			$this->search('', $this->search_string, $this->search_charset, $this->sort_field);
			}

			return $this->fetch_thread_headers($folder, clone $this->search_set, $page, $slice);
			}


			/**
			* Fetches messages headers (by UID)
			*
			* @param string $folder Folder name
			* @param array $msgs Message UIDs
			* @param bool $sort Enables result sorting by $msgs
			* @param bool $force Disables cache use
			*
			* @return array Messages headers indexed by UID
			*/
			function fetch_headers($folder, $msgs, $sort = true, $force = false)
			{
			if (empty($msgs)) {
			return array();
			}

			if (!$force && ($mcache = $this->get_mcache_engine())) {
			$headers = $mcache->get_messages($folder, $msgs);
			}
			else if (!$this->check_connection()) {
			return array();
			}
			else {
			// fetch reqested headers from server
			$headers = $this->conn->fetchHeaders(
			$folder, $msgs, true, false, $this->get_fetch_headers());
			}

			if (empty($headers)) {
			return array();
			}

			foreach ($headers as $h) {
			$a_msg_headers[$h->uid] = $h;
			}

			if ($sort) {
			// use this class for message sorting
			$sorter = new rcube_header_sorter();
			$sorter->set_index($msgs);
			$sorter->sort_headers($a_msg_headers);
			}

			return $a_msg_headers;
			}


			/**
			* Returns current status of folder
			*
			* We compare the maximum UID to determine the number of
			* new messages because the RECENT flag is not reliable.
			*
			* @param string $folder Folder name
			*
			* @return int Folder status
			*/
			public function folder_status($folder = null)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}
			}
			}
			$old = $this->get_folder_stats($folder);

			// refresh message count -> will update
			$this->messagecount($folder, 'ALL', true);

			/**
			* Helper function to get first and last index of the requested set
			*
			* @param int message count
			* @param mixed page number to show, or string 'all'
			* @return array array with two values: first index, last index
			* @access private
			*/
			private function _get_message_range($max, $page)
			{
			$start_msg = ($page-1) * $this->page_size;

			if ($page=='all')
			{
			$begin = 0;
			$end = $max;
			}
			else if ($this->sort_order=='DESC')
			{
			$begin = $max - $this->page_size - $start_msg;
			$end = $max - $start_msg;
			}
			else
			{
			$begin = $start_msg;
			$end = $start_msg + $this->page_size;
			}
			$result = 0;

			if ($begin < 0) $begin = 0;
			if ($end < 0) $end = $max;
			if ($end > $max) $end = $max;

			return array($begin, $end);
			}


			/**
			* Fetches message headers
			* Used for loop
			*
			* @param string Mailbox name
			* @param string Message index to fetch
			* @param array Reference to message headers array
			* @param array Array with cache index
			* @return int Messages count
			* @access private
			*/
			private function _fetch_headers($mailbox, $msgs, &$a_msg_headers, $cache_key)
			{
			// fetch reqested headers from server
			$a_header_index = iil_C_FetchHeaders($this->conn, $mailbox, $msgs, false, false, $this->fetch_add_headers);

			if (!empty($a_header_index))
			{
			// cache is incomplete
			$cache_index = $this->get_message_cache_index($cache_key);

			foreach ($a_header_index as $i => $headers) {
			if ($this->caching_enabled && $cache_index[$headers->id] != $headers->uid) {
			// prevent index duplicates
			if ($cache_index[$headers->id]) {
			$this->remove_message_cache($cache_key, $headers->id, true);
			unset($cache_index[$headers->id]);
			}
			// add message to cache
			$this->add_message_cache($cache_key, $headers->id, $headers, NULL,
			!in_array($headers->uid, $cache_index));
			}

			$a_msg_headers[$headers->uid] = $headers;
			}
			}

			return count($a_msg_headers);
			}

			/**
			* Fetches IDS of pseudo recent messages.
			*
			* We compare the maximum UID to determine the number of
			* new messages because the RECENT flag is not reliable.
			*
			* @param string Mailbox/folder name
			* @return array List of recent message UIDs
			*/
			function recent_uids($mbox_name = null, $nofetch = false)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			$old_maxuid = intval($_SESSION['maxuid'][$mailbox]);

			// refresh message count -> will update $_SESSION['maxuid'][$mailbox]
			$this->_messagecount($mailbox, 'ALL', true);

			if ($_SESSION['maxuid'][$mailbox] > $old_maxuid) {
			$maxuid = max(1, $old_maxuid+1);
			return array_values((array)iil_C_FetchHeaderIndex($this->conn, $mailbox, "$maxuid:*", 'UID', $this->skip_deleted, true));
			}

			return array();
			}

			/**
			* Return sorted array of message IDs (not UIDs)
			*
			* @param string Mailbox to get index from
			* @param string Sort column
			* @param string Sort order [ASC, DESC]
			* @return array Indexed array with message ids
			*/
			function message_index($mbox_name='', $sort_field=NULL, $sort_order=NULL)
			{
			$this->_set_sort_order($sort_field, $sort_order);

			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			$key = "{$mailbox}:{$this->sort_field}:{$this->sort_order}:{$this->search_string}.msgi";

			// we have a saved search result, get index from there
			if (!isset($this->cache[$key]) && $this->search_string && $mailbox == $this->mailbox)
			{
			$this->cache[$key] = array();

			// use message index sort for sorting by Date
			if ($this->index_sort && $this->sort_field == 'date')
			{
			$msgs = $this->search_set;

			if ($this->search_sort_field != 'date')
			sort($msgs);

			if ($this->sort_order == 'DESC')
			$this->cache[$key] = array_reverse($msgs);
			else
			$this->cache[$key] = $msgs;
			}
			// sort with SORT command
			else if ($this->get_capability('sort'))
			{
			if ($this->sort_field && $this->search_sort_field != $this->sort_field)
			$this->search('', $this->search_string, $this->search_charset, $this->sort_field);

			if ($this->sort_order == 'DESC')
			$this->cache[$key] = array_reverse($this->search_set);
			else
			$this->cache[$key] = $this->search_set;
			}
			else
			{
			$a_index = iil_C_FetchHeaderIndex($this->conn, $mailbox, join(',', $this->search_set), $this->sort_field, $this->skip_deleted);

			if ($this->sort_order=="ASC")
			asort($a_index);
			else if ($this->sort_order=="DESC")
			arsort($a_index);

			$this->cache[$key] = array_keys($a_index);
			}
			}

			// have stored it in RAM
			if (isset($this->cache[$key]))
			return $this->cache[$key];

			// check local cache
			$cache_key = $mailbox.'.msg';
			$cache_status = $this->check_cache_status($mailbox, $cache_key);

			// cache is OK
			if ($cache_status>0)
			{
			$a_index = $this->get_message_cache_index($cache_key, TRUE, $this->sort_field, $this->sort_order);
			return array_keys($a_index);
			}

			// use message index sort for sorting by Date
			if ($this->index_sort && $this->sort_field == 'date')
			{
			if ($this->skip_deleted) {
			$a_index = $this->_search_index($mailbox, 'ALL');
			} else if ($max = $this->_messagecount($mailbox)) {
			$a_index = range(1, $max);
			}

			if ($this->sort_order == 'DESC')
			$a_index = array_reverse($a_index);

			$this->cache[$key] = $a_index;
			}
			// fetch complete message index
			else if ($this->get_capability('sort') && ($a_index = iil_C_Sort($this->conn, $mailbox, $this->sort_field, $this->skip_deleted ? 'UNDELETED' : '')))
			{
			if ($this->sort_order == 'DESC')
			$a_index = array_reverse($a_index);

			$this->cache[$key] = $a_index;
			}
			else
			{
			$a_index = iil_C_FetchHeaderIndex($this->conn, $mailbox, "1:*", $this->sort_field, $this->skip_deleted);

			if ($this->sort_order=="ASC")
			asort($a_index);
			else if ($this->sort_order=="DESC")
			arsort($a_index);

			$this->cache[$key] = array_keys($a_index);
			}

			return $this->cache[$key];
			}


			/**
			* @access private
			*/
			function sync_header_index($mailbox)
			{
			$cache_key = $mailbox.'.msg';
			$cache_index = $this->get_message_cache_index($cache_key);

			// fetch complete message index
			$a_message_index = iil_C_FetchHeaderIndex($this->conn, $mailbox, "1:*", 'UID', $this->skip_deleted);

			if ($a_message_index === false)
			return false;

			foreach ($a_message_index as $id => $uid)
			{
			// message in cache at correct position
			if ($cache_index[$id] == $uid)
			{
			unset($cache_index[$id]);
			continue;
			}

			// message in cache but in wrong position
			if (in_array((string)$uid, $cache_index, TRUE))
			{
			unset($cache_index[$id]);
			}

			// other message at this position
			if (isset($cache_index[$id]))
			{
			$for_remove[] = $cache_index[$id];
			unset($cache_index[$id]);
			}

			$for_update[] = $id;
			}

			// clear messages at wrong positions and those deleted that are still in cache_index
			if (!empty($for_remove))
			$cache_index = array_merge($cache_index, $for_remove);

			if (!empty($cache_index))
			$this->remove_message_cache($cache_key, $cache_index);

			// fetch complete headers and add to cache
			if (!empty($for_update)) {
			if ($headers = iil_C_FetchHeader($this->conn, $mailbox, join(',', $for_update), false, $this->fetch_add_headers))
			foreach ($headers as $header)
			$this->add_message_cache($cache_key, $header->id, $header, NULL,
			in_array($header->uid, (array)$for_remove));
			}
			}


			/**
			* Invoke search request to IMAP server
			*
			* @param string mailbox name to search in
			* @param string search string
			* @param string search string charset
			* @param string header field to sort by
			* @return array search results as list of message ids
			* @access public
			*/
			function search($mbox_name='', $str=NULL, $charset=NULL, $sort_field=NULL)
			{
			if (!$str)
			return false;

			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;

			$results = $this->_search_index($mailbox, $str, $charset, $sort_field);

			// try search with US-ASCII charset (should be supported by server)
			// only if UTF-8 search is not supported
			if (empty($results) && !is_array($results) && !empty($charset) && $charset != 'US-ASCII')
			{
			// convert strings to US_ASCII
			if(preg_match_all('/\{([0-9]+)\}\r\n/', $str, $matches, PREG_OFFSET_CAPTURE))
			{
			$last = 0; $res = '';
			foreach($matches[1] as $m)
			{
			$string_offset = $m[1] + strlen($m[0]) + 4; // {}\r\n
			$string = substr($str, $string_offset - 1, $m[0]);
			$string = rcube_charset_convert($string, $charset, 'US-ASCII');
			if (!$string) continue;
			$res .= sprintf("%s{%d}\r\n%s", substr($str, $last, $m[1] - $last - 1), strlen($string), $string);
			$last = $m[0] + $string_offset - 1;
			}
			if ($last < strlen($str))
			$res .= substr($str, $last, strlen($str)-$last);
			}
			else // strings for conversion not found
			$res = $str;

			$results = $this->search($mbox_name, $res, NULL, $sort_field);
			}

			$this->set_search_set($str, $results, $charset, $sort_field);

			return $results;
			}


			/**
			* Private search method
			*
			* @return array search results as list of message ids
			* @access private
			* @see rcube_imap::search()
			*/
			private function _search_index($mailbox, $criteria='ALL', $charset=NULL, $sort_field=NULL)
			{
			$orig_criteria = $criteria;

			if ($this->skip_deleted && !preg_match('/UNDELETED/', $criteria))
			$criteria = 'UNDELETED '.$criteria;

			if ($sort_field && $this->get_capability('sort') && (!$this->index_sort \|\| $sort_field != 'date')) {
			$charset = $charset ? $charset : $this->default_charset;
			$a_messages = iil_C_Sort($this->conn, $mailbox, $sort_field, $criteria, FALSE, $charset);
			}
			else {
			if ($orig_criteria == 'ALL') {
			$max = $this->_messagecount($mailbox);
			$a_messages = $max ? range(1, $max) : array();
			}
			else {
			$a_messages = iil_C_Search($this->conn, $mailbox, ($charset ? "CHARSET $charset " : '') . $criteria);

			// I didn't found that SEARCH always returns sorted IDs
			if ($this->index_sort && $this->sort_field == 'date')
			sort($a_messages);
			}
			}
			// update messagecount cache ?
			// $a_mailbox_cache = get_cache('messagecount');
			// $a_mailbox_cache[$mailbox][$criteria] = sizeof($a_messages);
			// $this->update_cache('messagecount', $a_mailbox_cache);

			return $a_messages;
			}


			/**
			* Refresh saved search set
			*
			* @return array Current search set
			*/
			function refresh_search()
			{
			if (!empty($this->search_string))
			$this->search_set = $this->search('', $this->search_string, $this->search_charset, $this->search_sort_field);

			return $this->get_search_set();
			}


			/**
			* Check if the given message ID is part of the current search set
			*
			* @return boolean True on match or if no search request is stored
			*/
			function in_searchset($msgid)
			{
			if (!empty($this->search_string))
			return in_array("$msgid", (array)$this->search_set, true);
			else
			return true;
			}


			/**
			* Return message headers object of a specific message
			*
			* @param int Message ID
			* @param string Mailbox to read from
			* @param boolean True if $id is the message UID
			* @param boolean True if we need also BODYSTRUCTURE in headers
			* @return object Message headers representation
			*/
			function get_headers($id, $mbox_name=NULL, $is_uid=TRUE, $bodystr=FALSE)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			$uid = $is_uid ? $id : $this->_id2uid($id);

			// get cached headers
			if ($uid && ($headers = &$this->get_cached_message($mailbox.'.msg', $uid)))
			return $headers;

			$headers = iil_C_FetchHeader($this->conn, $mailbox, $id, $is_uid, $bodystr, $this->fetch_add_headers);

			// write headers cache
			if ($headers)
			{
			if ($headers->uid && $headers->id)
			$this->uid_id_map[$mailbox][$headers->uid] = $headers->id;

			$this->add_message_cache($mailbox.'.msg', $headers->id, $headers, NULL, true);
			}

			return $headers;
			}


			/**
			* Fetch body structure from the IMAP server and build
			* an object structure similar to the one generated by PEAR::Mail_mimeDecode
			*
			* @param int Message UID to fetch
			* @param string Message BODYSTRUCTURE string (optional)
			* @return object rcube_message_part Message part tree or False on failure
			*/
			function &get_structure($uid, $structure_str='')
			{
			$cache_key = $this->mailbox.'.msg';
			$headers = &$this->get_cached_message($cache_key, $uid);

			// return cached message structure
			if (is_object($headers) && is_object($headers->structure)) {
			return $headers->structure;
			}

			if (!$structure_str)
			$structure_str = iil_C_FetchStructureString($this->conn, $this->mailbox, $uid, true);
			$structure = iml_GetRawStructureArray($structure_str);
			$struct = false;

			// parse structure and add headers
			if (!empty($structure))
			{
			$headers = $this->get_headers($uid);
			$this->_msg_id = $headers->id;

			// set message charset from message headers
			if ($headers->charset)
			$this->struct_charset = $headers->charset;
			else
			$this->struct_charset = $this->_structure_charset($structure);

			// Here we can recognize malformed BODYSTRUCTURE and
			// 1. [@TODO] parse the message in other way to create our own message structure
			// 2. or just show the raw message body.
			// Example of structure for malformed MIME message:
			// ("text" "plain" ("charset" "us-ascii") NIL NIL "7bit" 2154 70 NIL NIL NIL)
			if ($headers->ctype && $headers->ctype != 'text/plain'
			&& $structure[0] == 'text' && $structure[1] == 'plain') {
			return false;
			}

			$struct = &$this->_structure_part($structure);
			$struct->headers = get_object_vars($headers);

			// don't trust given content-type
			if (empty($struct->parts) && !empty($struct->headers['ctype']))
			{
			$struct->mime_id = '1';
			$struct->mimetype = strtolower($struct->headers['ctype']);
			list($struct->ctype_primary, $struct->ctype_secondary) = explode('/', $struct->mimetype);
			if (empty($old)) {
			return $result;
			}

			// write structure to cache
			if ($this->caching_enabled)
			$this->add_message_cache($cache_key, $this->_msg_id, $headers, $struct);
			}
			$new = $this->get_folder_stats($folder);

			return $struct;
			// got new messages
			if ($new['maxuid'] > $old['maxuid']) {
			$result += 1;
			}
			// some messages has been deleted
			if ($new['cnt'] < $old['cnt']) {
			$result += 2;
			}

			// @TODO: optional checking for messages flags changes (?)
			// @TODO: UIDVALIDITY checking

			return $result;
			}


			/**
			* Build message part object
			*
			* @access private
			*/
			function &_structure_part($part, $count=0, $parent='', $mime_headers=null, $raw_headers=null)

			/**
			* Stores folder statistic data in session
			* @TODO: move to separate DB table (cache?)
			*
			* @param string $folder Folder name
			* @param string $name Data name
			* @param mixed $data Data value
			*/
			protected function set_folder_stats($folder, $name, $data)
			{
			$struct = new rcube_message_part;
			$struct->mime_id = empty($parent) ? (string)$count : "$parent.$count";
			$_SESSION['folders'][$folder][$name] = $data;
			}

			// multipart
			if (is_array($part[0]))
			{
			$struct->ctype_primary = 'multipart';

			// find first non-array entry
			for ($i=1; $i<count($part); $i++)
			if (!is_array($part[$i]))
			{
			$struct->ctype_secondary = strtolower($part[$i]);
			break;
			}

			$struct->mimetype = 'multipart/'.$struct->ctype_secondary;

			// build parts list for headers pre-fetching
			for ($i=0, $count=0; $i<count($part); $i++)
			if (is_array($part[$i]) && count($part[$i]) > 3) {
			// fetch message headers if message/rfc822 or named part (could contain Content-Location header)
			if (!is_array($part[$i][0])) {
			$tmp_part_id = $struct->mime_id ? $struct->mime_id.'.'.($i+1) : $i+1;
			if (strtolower($part[$i][0]) == 'message' && strtolower($part[$i][1]) == 'rfc822') {
			$raw_part_headers[] = $tmp_part_id;
			$mime_part_headers[] = $tmp_part_id;
			}
			else if (in_array('name', (array)$part[$i][2]) && (empty($part[$i][3]) \|\| $part[$i][3]=='NIL')) {
			$mime_part_headers[] = $tmp_part_id;
			}
			/**
			* Gets folder statistic data
			*
			* @param string $folder Folder name
			*
			* @return array Stats data
			*/
			protected function get_folder_stats($folder)
			{
			if ($_SESSION['folders'][$folder]) {
			return (array) $_SESSION['folders'][$folder];
			}

			return array();
			}


			/**
			* Return sorted list of message UIDs
			*
			* @param string $folder Folder to get index from
			* @param string $sort_field Sort column
			* @param string $sort_order Sort order [ASC, DESC]
			*
			* @return rcube_result_index\|rcube_result_thread List of messages (UIDs)
			*/
			public function index($folder = '', $sort_field = NULL, $sort_order = NULL)
			{
			if ($this->threading) {
			return $this->thread_index($folder, $sort_field, $sort_order);
			}

			$this->set_sort_order($sort_field, $sort_order);

			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			// we have a saved search result, get index from there
			if ($this->search_string) {
			if ($this->search_threads) {
			$this->search($folder, $this->search_string, $this->search_charset, $this->sort_field);
			}
			}

			// pre-fetch headers of all parts (in one command for better performance)
			// @TODO: we could do this before _structure_part() call, to fetch
			// headers for parts on all levels
			if ($mime_part_headers)
			$mime_part_headers = iil_C_FetchMIMEHeaders($this->conn, $this->mailbox,
			$this->_msg_id, $mime_part_headers);
			// we'll need a real content-type of message/rfc822 part
			if ($raw_part_headers)
			$raw_part_headers = iil_C_FetchMIMEHeaders($this->conn, $this->mailbox,
			$this->_msg_id, $raw_part_headers, false);

			$struct->parts = array();
			for ($i=0, $count=0; $i<count($part); $i++)
			if (is_array($part[$i]) && count($part[$i]) > 3) {
			$tmp_part_id = $struct->mime_id ? $struct->mime_id.'.'.($i+1) : $i+1;
			$struct->parts[] = $this->_structure_part($part[$i], ++$count, $struct->mime_id,
			$mime_part_headers[$tmp_part_id], $raw_part_headers[$tmp_part_id]);
			}
			// use message index sort as default sorting
			if (!$this->sort_field \|\| $this->search_sorted) {
			if ($this->sort_field && $this->search_sort_field != $this->sort_field) {
			$this->search($folder, $this->search_string, $this->search_charset, $this->sort_field);
			}
			$index = $this->search_set;
			}
			else if (!$this->check_connection()) {
			return new rcube_result_index();
			}
			else {
			$index = $this->conn->index($folder, $this->search_set->get(),
			$this->sort_field, $this->options['skip_deleted'], true, true);
			}

			return $struct;
			}
			if ($this->sort_order != $index->get_parameters('ORDER')) {
			$index->revert();
			}


			// regular part
			$struct->ctype_primary = strtolower($part[0]);
			$struct->ctype_secondary = strtolower($part[1]);
			$struct->mimetype = $struct->ctype_primary.'/'.$struct->ctype_secondary;

			// read content type parameters
			if (is_array($part[2]))
			{
			$struct->ctype_parameters = array();
			for ($i=0; $i<count($part[2]); $i+=2)
			$struct->ctype_parameters[strtolower($part[2][$i])] = $part[2][$i+1];

			if (isset($struct->ctype_parameters['charset']))
			$struct->charset = $struct->ctype_parameters['charset'];
			}

			// read content encoding
			if (!empty($part[5]) && $part[5]!='NIL')
			{
			$struct->encoding = strtolower($part[5]);
			$struct->headers['content-transfer-encoding'] = $struct->encoding;
			}

			// get part size
			if (!empty($part[6]) && $part[6]!='NIL')
			$struct->size = intval($part[6]);

			// read part disposition
			$di = count($part) - 2;
			if ((is_array($part[$di]) && count($part[$di]) == 2 && is_array($part[$di][1])) \|\|
			(is_array($part[--$di]) && count($part[$di]) == 2))
			{
			$struct->disposition = strtolower($part[$di][0]);

			if (is_array($part[$di][1]))
			for ($n=0; $n<count($part[$di][1]); $n+=2)
			$struct->d_parameters[strtolower($part[$di][1][$n])] = $part[$di][1][$n+1];
			}

			// get child parts
			if (is_array($part[8]) && $di != 8)
			{
			$struct->parts = array();
			for ($i=0, $count=0; $i<count($part[8]); $i++)
			if (is_array($part[8][$i]) && count($part[8][$i]) > 5)
			$struct->parts[] = $this->_structure_part($part[8][$i], ++$count, $struct->mime_id);
			}

			// get part ID
			if (!empty($part[3]) && $part[3]!='NIL')
			{
			$struct->content_id = $part[3];
			$struct->headers['content-id'] = $part[3];

			if (empty($struct->disposition))
			$struct->disposition = 'inline';
			}

			// fetch message headers if message/rfc822 or named part (could contain Content-Location header)
			if ($struct->ctype_primary == 'message' \|\| ($struct->ctype_parameters['name'] && !$struct->content_id)) {
			if (empty($mime_headers))
			$mime_headers = iil_C_FetchPartHeader($this->conn, $this->mailbox, $this->_msg_id, false, $struct->mime_id);
			$struct->headers = $this->_parse_headers($mime_headers) + $struct->headers;

			// get real headers for message of type 'message/rfc822'
			if ($struct->mimetype == 'message/rfc822') {
			if (empty($raw_headers))
			$raw_headers = iil_C_FetchMIMEHeaders($this->conn, $this->mailbox, $this->_msg_id, (array)$struct->mime_id, false);
			$struct->real_headers = $this->_parse_headers($raw_headers);

			// get real content-type of message/rfc822
			if (preg_match('/^([a-z0-9_\/-]+)/i', $struct->real_headers['content-type'], $matches)) {
			$struct->real_mimetype = strtolower($matches[1]);
			}
			return $index;
			}
			}

			if ($struct->ctype_primary=='message') {
			if (is_array($part[8]) && $di != 8 && empty($struct->parts))
			$struct->parts[] = $this->_structure_part($part[8], ++$count, $struct->mime_id);
			}
			// check local cache
			if ($mcache = $this->get_mcache_engine()) {
			$index = $mcache->get_index($folder, $this->sort_field, $this->sort_order);
			}
			// fetch from IMAP server
			else {
			$index = $this->index_direct(
			$folder, $this->sort_field, $this->sort_order);
			}

			// normalize filename property
			$this->_set_part_filename($struct, $mime_headers);

			return $struct;
			return $index;
			}


			/**
			* Set attachment filename from message part structure
			*
			* @access private
			* @param object rcube_message_part Part object
			* @param string Part's raw headers
			*/
			private function _set_part_filename(&$part, $headers=null)

			/**
			* Return sorted list of message UIDs ignoring current search settings.
			* Doesn't uses cache by default.
			*
			* @param string $folder Folder to get index from
			* @param string $sort_field Sort column
			* @param string $sort_order Sort order [ASC, DESC]
			* @param bool $skip_cache Disables cache usage
			*
			* @return rcube_result_index Sorted list of message UIDs
			*/
			public function index_direct($folder, $sort_field = null, $sort_order = null, $skip_cache = true)
			{
			if (!empty($part->d_parameters['filename']))
			$filename_mime = $part->d_parameters['filename'];
			else if (!empty($part->d_parameters['filename*']))
			$filename_encoded = $part->d_parameters['filename*'];
			else if (!empty($part->ctype_parameters['name*']))
			$filename_encoded = $part->ctype_parameters['name*'];
			// RFC2231 value continuations
			// TODO: this should be rewrited to support RFC2231 4.1 combinations
			else if (!empty($part->d_parameters['filename*0'])) {
			$i = 0;
			while (isset($part->d_parameters['filename*'.$i])) {
			$filename_mime .= $part->d_parameters['filename*'.$i];
			$i++;
			}
			// some servers (eg. dovecot-1.x) have no support for parameter value continuations
			// we must fetch and parse headers "manually"
			if ($i<2) {
			if (!$headers)
			$headers = iil_C_FetchPartHeader($this->conn, $this->mailbox, $this->_msg_id, false, $part->mime_id);
			$filename_mime = '';
			$i = 0;
			while (preg_match('/filename\'.$i.'\s=\s"([^"\n;]+)[";]*/', $headers, $matches)) {
			$filename_mime .= $matches[1];
			$i++;
			if (!$skip_cache && ($mcache = $this->get_mcache_engine())) {
			$index = $mcache->get_index($folder, $sort_field, $sort_order);
			}
			}
			}
			else if (!empty($part->d_parameters['filename0'])) {
			$i = 0;
			while (isset($part->d_parameters['filename'.$i.''])) {
			$filename_encoded .= $part->d_parameters['filename'.$i.''];
			$i++;
			}
			if ($i<2) {
			if (!$headers)
			$headers = iil_C_FetchPartHeader($this->conn, $this->mailbox, $this->_msg_id, false, $part->mime_id);
			$filename_encoded = '';
			$i = 0; $matches = array();
			while (preg_match('/filename\'.$i.'\\s=\s"([^"\n;]+)[";]/', $headers, $matches)) {
			$filename_encoded .= $matches[1];
			$i++;
			// use message index sort as default sorting
			else if (!$sort_field) {
			// use search result from count() if possible
			if ($this->options['skip_deleted'] && !empty($this->icache['undeleted_idx'])
			&& $this->icache['undeleted_idx']->get_parameters('ALL') !== null
			&& $this->icache['undeleted_idx']->get_parameters('MAILBOX') == $folder
			) {
			$index = $this->icache['undeleted_idx'];
			}
			else if (!$this->check_connection()) {
			return new rcube_result_index();
			}
			else {
			$index = $this->conn->search($folder,
			'ALL' .($this->options['skip_deleted'] ? ' UNDELETED' : ''), true);
			}
			}
			}
			}
			else if (!empty($part->ctype_parameters['name*0'])) {
			$i = 0;
			while (isset($part->ctype_parameters['name*'.$i])) {
			$filename_mime .= $part->ctype_parameters['name*'.$i];
			$i++;
			}
			if ($i<2) {
			if (!$headers)
			$headers = iil_C_FetchPartHeader($this->conn, $this->mailbox, $this->_msg_id, false, $part->mime_id);
			$filename_mime = '';
			$i = 0; $matches = array();
			while (preg_match('/\s+name\'.$i.'\s=\s"([^"\n;]+)[";]*/', $headers, $matches)) {
			$filename_mime .= $matches[1];
			$i++;
			else if (!$this->check_connection()) {
			return new rcube_result_index();
			}
			}
			}
			else if (!empty($part->ctype_parameters['name0'])) {
			$i = 0;
			while (isset($part->ctype_parameters['name'.$i.''])) {
			$filename_encoded .= $part->ctype_parameters['name'.$i.''];
			$i++;
			}
			if ($i<2) {
			if (!$headers)
			$headers = iil_C_FetchPartHeader($this->conn, $this->mailbox, $this->_msg_id, false, $part->mime_id);
			$filename_encoded = '';
			$i = 0; $matches = array();
			while (preg_match('/\s+name\'.$i.'\\s=\s"([^"\n;]+)[";]/', $headers, $matches)) {
			$filename_encoded .= $matches[1];
			$i++;
			}
			}
			}
			// read 'name' after rfc2231 parameters as it may contains truncated filename (from Thunderbird)
			else if (!empty($part->ctype_parameters['name']))
			$filename_mime = $part->ctype_parameters['name'];
			// Content-Disposition
			else if (!empty($part->headers['content-description']))
			$filename_mime = $part->headers['content-description'];
			else
			return;
			// fetch complete message index
			else {
			if ($this->get_capability('SORT')) {
			$index = $this->conn->sort($folder, $sort_field,
			$this->options['skip_deleted'] ? 'UNDELETED' : '', true);
			}

			// decode filename
			if (!empty($filename_mime)) {
			$part->filename = rcube_imap::decode_mime_string($filename_mime,
			$part->charset ? $part->charset : $this->struct_charset ? $this->struct_charset :
			rc_detect_encoding($filename_mime, $this->default_charset));
			}
			else if (!empty($filename_encoded)) {
			// decode filename according to RFC 2231, Section 4
			if (preg_match("/^([^'])'[^']'(.*)$/", $filename_encoded, $fmatches)) {
			$filename_charset = $fmatches[1];
			$filename_encoded = $fmatches[2];
			if (empty($index) \|\| $index->is_error()) {
			$index = $this->conn->index($folder, "1:*", $sort_field,
			$this->options['skip_deleted'], false, true);
			}
			}
			$part->filename = rcube_charset_convert(urldecode($filename_encoded), $filename_charset);
			}

			if ($sort_order != $index->get_parameters('ORDER')) {
			$index->revert();
			}

			return $index;
			}


			/**
			* Get charset name from message structure (first part)
			*
			* @access private
			* @param array Message structure
			* @return string Charset name
			*/
			function _structure_charset($structure)
			/**
			* Return index of threaded message UIDs
			*
			* @param string $folder Folder to get index from
			* @param string $sort_field Sort column
			* @param string $sort_order Sort order [ASC, DESC]
			*
			* @return rcube_result_thread Message UIDs
			*/
			public function thread_index($folder='', $sort_field=NULL, $sort_order=NULL)
			{
			while (is_array($structure)) {
			if (is_array($structure[2]) && $structure[2][0] == 'charset')
			return $structure[2][1];
			$structure = $structure[0];
			}
			}
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			// we have a saved search result, get index from there
			if ($this->search_string && $this->search_threads && $folder == $this->folder) {
			$threads = $this->search_set;
			}
			else {
			// get all threads (default sort order)
			$threads = $this->fetch_threads($folder);
			}

			$this->set_sort_order($sort_field, $sort_order);
			$this->sort_threads($threads);

			return $threads;
			}


			/**
			* Fetch message body of a specific message from the server
			*
			* @param int Message UID
			* @param string Part number
			* @param object rcube_message_part Part object created by get_structure()
			* @param mixed True to print part, ressource to write part contents in
			* @param resource File pointer to save the message part
			* @return string Message/part body if not printed
			*/
			function &get_message_part($uid, $part=1, $o_part=NULL, $print=NULL, $fp=NULL)
			/**
			* Sort threaded result, using THREAD=REFS method
			*
			* @param rcube_result_thread $threads Threads result set
			*/
			protected function sort_threads($threads)
			{
			// get part encoding if not provided
			if (!is_object($o_part))
			{
			$structure_str = iil_C_FetchStructureString($this->conn, $this->mailbox, $uid, true);
			$structure = iml_GetRawStructureArray($structure_str);
			// error or message not found
			if (empty($structure))
			if ($threads->is_empty()) {
			return;
			}

			// THREAD=ORDEREDSUBJECT: sorting by sent date of root message
			// THREAD=REFERENCES: sorting by sent date of root message
			// THREAD=REFS: sorting by the most recent date in each thread

			if ($this->sort_field && ($this->sort_field != 'date' \|\| $this->get_capability('THREAD') != 'REFS')) {
			$index = $this->index_direct($this->folder, $this->sort_field, $this->sort_order, false);

			if (!$index->is_empty()) {
			$threads->sort($index);
			}
			}
			else {
			if ($this->sort_order != $threads->get_parameters('ORDER')) {
			$threads->revert();
			}
			}
			}


			/**
			* Invoke search request to IMAP server
			*
			* @param string $folder Folder name to search in
			* @param string $str Search criteria
			* @param string $charset Search charset
			* @param string $sort_field Header field to sort by
			*
			* @todo: Search criteria should be provided in non-IMAP format, eg. array
			*/
			public function search($folder='', $str='ALL', $charset=NULL, $sort_field=NULL)
			{
			if (!$str) {
			$str = 'ALL';
			}

			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			$results = $this->search_index($folder, $str, $charset, $sort_field);

			$this->set_search_set(array($str, $results, $charset, $sort_field,
			$this->threading \|\| $this->search_sorted ? true : false));
			}


			/**
			* Direct (real and simple) SEARCH request (without result sorting and caching).
			*
			* @param string $mailbox Mailbox name to search in
			* @param string $str Search string
			*
			* @return rcube_result_index Search result (UIDs)
			*/
			public function search_once($folder = null, $str = 'ALL')
			{
			if (!$str) {
			return 'ALL';
			}

			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			if (!$this->check_connection()) {
			return new rcube_result_index();
			}

			$index = $this->conn->search($folder, $str, true);

			return $index;
			}


			/**
			* protected search method
			*
			* @param string $folder Folder name
			* @param string $criteria Search criteria
			* @param string $charset Charset
			* @param string $sort_field Sorting field
			*
			* @return rcube_result_index\|rcube_result_thread Search results (UIDs)
			* @see rcube_imap::search()
			*/
			protected function search_index($folder, $criteria='ALL', $charset=NULL, $sort_field=NULL)
			{
			$orig_criteria = $criteria;

			if (!$this->check_connection()) {
			if ($this->threading) {
			return new rcube_result_thread();
			}
			else {
			return new rcube_result_index();
			}
			}

			if ($this->options['skip_deleted'] && !preg_match('/UNDELETED/', $criteria)) {
			$criteria = 'UNDELETED '.$criteria;
			}

			if ($this->threading) {
			$threads = $this->conn->thread($folder, $this->threading, $criteria, true, $charset);

			// Error, try with US-ASCII (RFC5256: SORT/THREAD must support US-ASCII and UTF-8,
			// but I've seen that Courier doesn't support UTF-8)
			if ($threads->is_error() && $charset && $charset != 'US-ASCII') {
			$threads = $this->conn->thread($folder, $this->threading,
			$this->convert_criteria($criteria, $charset), true, 'US-ASCII');
			}

			return $threads;
			}

			if ($sort_field && $this->get_capability('SORT')) {
			$charset = $charset ? $charset : $this->default_charset;
			$messages = $this->conn->sort($folder, $sort_field, $criteria, true, $charset);

			// Error, try with US-ASCII (RFC5256: SORT/THREAD must support US-ASCII and UTF-8,
			// but I've seen Courier with disabled UTF-8 support)
			if ($messages->is_error() && $charset && $charset != 'US-ASCII') {
			$messages = $this->conn->sort($folder, $sort_field,
			$this->convert_criteria($criteria, $charset), true, 'US-ASCII');
			}

			if (!$messages->is_error()) {
			$this->search_sorted = true;
			return $messages;
			}
			}

			$messages = $this->conn->search($folder,
			($charset ? "CHARSET $charset " : '') . $criteria, true);

			// Error, try with US-ASCII (some servers may support only US-ASCII)
			if ($messages->is_error() && $charset && $charset != 'US-ASCII') {
			$messages = $this->conn->search($folder,
			$this->convert_criteria($criteria, $charset), true);
			}

			$this->search_sorted = false;

			return $messages;
			}


			/**
			* Converts charset of search criteria string
			*
			* @param string $str Search string
			* @param string $charset Original charset
			* @param string $dest_charset Destination charset (default US-ASCII)
			*
			* @return string Search string
			*/
			protected function convert_criteria($str, $charset, $dest_charset='US-ASCII')
			{
			// convert strings to US_ASCII
			if (preg_match_all('/\{([0-9]+)\}\r\n/', $str, $matches, PREG_OFFSET_CAPTURE)) {
			$last = 0; $res = '';
			foreach ($matches[1] as $m) {
			$string_offset = $m[1] + strlen($m[0]) + 4; // {}\r\n
			$string = substr($str, $string_offset - 1, $m[0]);
			$string = rcube_charset_convert($string, $charset, $dest_charset);
			if ($string === false) {
			continue;
			}
			$res .= substr($str, $last, $m[1] - $last - 1) . rcube_imap_generic::escape($string);
			$last = $m[0] + $string_offset - 1;
			}
			if ($last < strlen($str)) {
			$res .= substr($str, $last, strlen($str)-$last);
			}
			}
			// strings for conversion not found
			else {
			$res = $str;
			}

			return $res;
			}


			/**
			* Refresh saved search set
			*
			* @return array Current search set
			*/
			public function refresh_search()
			{
			if (!empty($this->search_string)) {
			$this->search('', $this->search_string, $this->search_charset, $this->search_sort_field);
			}

			return $this->get_search_set();
			}


			/**
			* Return message headers object of a specific message
			*
			* @param int $id Message UID
			* @param string $folder Folder to read from
			* @param bool $force True to skip cache
			*
			* @return rcube_mail_header Message headers
			*/
			public function get_message_headers($uid, $folder = null, $force = false)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			// get cached headers
			if (!$force && $uid && ($mcache = $this->get_mcache_engine())) {
			$headers = $mcache->get_message($folder, $uid);
			}
			else if (!$this->check_connection()) {
			$headers = false;
			}
			else {
			$headers = $this->conn->fetchHeader(
			$folder, $uid, true, true, $this->get_fetch_headers());
			}

			return $headers;
			}


			/**
			* Fetch message headers and body structure from the IMAP server and build
			* an object structure similar to the one generated by PEAR::Mail_mimeDecode
			*
			* @param int $uid Message UID to fetch
			* @param string $folder Folder to read from
			*
			* @return object rcube_mail_header Message data
			*/
			public function get_message($uid, $folder = null)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			// Check internal cache
			if (!empty($this->icache['message'])) {
			if (($headers = $this->icache['message']) && $headers->uid == $uid) {
			return $headers;
			}
			}

			$headers = $this->get_message_headers($uid, $folder);

			// message doesn't exist?
			if (empty($headers)) {
			return null;
			}

			// structure might be cached
			if (!empty($headers->structure)) {
			return $headers;
			}

			$this->msg_uid = $uid;

			if (!$this->check_connection()) {
			return $headers;
			}

			if (empty($headers->bodystructure)) {
			$headers->bodystructure = $this->conn->getStructure($folder, $uid, true);
			}

			$structure = $headers->bodystructure;

			if (empty($structure)) {
			return $headers;
			}

			// set message charset from message headers
			if ($headers->charset) {
			$this->struct_charset = $headers->charset;
			}
			else {
			$this->struct_charset = $this->structure_charset($structure);
			}

			$headers->ctype = strtolower($headers->ctype);

			// Here we can recognize malformed BODYSTRUCTURE and
			// 1. [@TODO] parse the message in other way to create our own message structure
			// 2. or just show the raw message body.
			// Example of structure for malformed MIME message:
			// ("text" "plain" NIL NIL NIL "7bit" 2154 70 NIL NIL NIL)
			if ($headers->ctype && !is_array($structure[0]) && $headers->ctype != 'text/plain'
			&& strtolower($structure[0].'/'.$structure[1]) == 'text/plain') {
			// we can handle single-part messages, by simple fix in structure (#1486898)
			if (preg_match('/^(text\|application)\/(.*)/', $headers->ctype, $m)) {
			$structure[0] = $m[1];
			$structure[1] = $m[2];
			}
			else {
			return $headers;
			}
			}

			$struct = $this->structure_part($structure, 0, '', $headers);

			// don't trust given content-type
			if (empty($struct->parts) && !empty($headers->ctype)) {
			$struct->mime_id = '1';
			$struct->mimetype = strtolower($headers->ctype);
			list($struct->ctype_primary, $struct->ctype_secondary) = explode('/', $struct->mimetype);
			}

			$headers->structure = $struct;

			return $this->icache['message'] = $headers;
			}


			/**
			* Build message part object
			*
			* @param array $part
			* @param int $count
			* @param string $parent
			*/
			protected function structure_part($part, $count=0, $parent='', $mime_headers=null)
			{
			$struct = new rcube_message_part;
			$struct->mime_id = empty($parent) ? (string)$count : "$parent.$count";

			// multipart
			if (is_array($part[0])) {
			$struct->ctype_primary = 'multipart';

			/* RFC3501: BODYSTRUCTURE fields of multipart part
			part1 array
			part2 array
			part3 array
			....
			1. subtype
			2. parameters (optional)
			3. description (optional)
			4. language (optional)
			5. location (optional)
			*/

			// find first non-array entry
			for ($i=1; $i<count($part); $i++) {
			if (!is_array($part[$i])) {
			$struct->ctype_secondary = strtolower($part[$i]);
			break;
			}
			}

			$struct->mimetype = 'multipart/'.$struct->ctype_secondary;

			// build parts list for headers pre-fetching
			for ($i=0; $i<count($part); $i++) {
			if (!is_array($part[$i])) {
			break;
			}
			// fetch message headers if message/rfc822
			// or named part (could contain Content-Location header)
			if (!is_array($part[$i][0])) {
			$tmp_part_id = $struct->mime_id ? $struct->mime_id.'.'.($i+1) : $i+1;
			if (strtolower($part[$i][0]) == 'message' && strtolower($part[$i][1]) == 'rfc822') {
			$mime_part_headers[] = $tmp_part_id;
			}
			else if (in_array('name', (array)$part[$i][2]) && empty($part[$i][3])) {
			$mime_part_headers[] = $tmp_part_id;
			}
			}
			}

			// pre-fetch headers of all parts (in one command for better performance)
			// @TODO: we could do this before _structure_part() call, to fetch
			// headers for parts on all levels
			if ($mime_part_headers) {
			$mime_part_headers = $this->conn->fetchMIMEHeaders($this->folder,
			$this->msg_uid, $mime_part_headers);
			}

			$struct->parts = array();
			for ($i=0, $count=0; $i<count($part); $i++) {
			if (!is_array($part[$i])) {
			break;
			}
			$tmp_part_id = $struct->mime_id ? $struct->mime_id.'.'.($i+1) : $i+1;
			$struct->parts[] = $this->structure_part($part[$i], ++$count, $struct->mime_id,
			$mime_part_headers[$tmp_part_id]);
			}

			return $struct;
			}

			/* RFC3501: BODYSTRUCTURE fields of non-multipart part
			0. type
			1. subtype
			2. parameters
			3. id
			4. description
			5. encoding
			6. size
			-- text
			7. lines
			-- message/rfc822
			7. envelope structure
			8. body structure
			9. lines
			--
			x. md5 (optional)
			x. disposition (optional)
			x. language (optional)
			x. location (optional)
			*/

			// regular part
			$struct->ctype_primary = strtolower($part[0]);
			$struct->ctype_secondary = strtolower($part[1]);
			$struct->mimetype = $struct->ctype_primary.'/'.$struct->ctype_secondary;

			// read content type parameters
			if (is_array($part[2])) {
			$struct->ctype_parameters = array();
			for ($i=0; $i<count($part[2]); $i+=2) {
			$struct->ctype_parameters[strtolower($part[2][$i])] = $part[2][$i+1];
			}

			if (isset($struct->ctype_parameters['charset'])) {
			$struct->charset = $struct->ctype_parameters['charset'];
			}
			}

			// #1487700: workaround for lack of charset in malformed structure
			if (empty($struct->charset) && !empty($mime_headers) && $mime_headers->charset) {
			$struct->charset = $mime_headers->charset;
			}

			// read content encoding
			if (!empty($part[5])) {
			$struct->encoding = strtolower($part[5]);
			$struct->headers['content-transfer-encoding'] = $struct->encoding;
			}

			// get part size
			if (!empty($part[6])) {
			$struct->size = intval($part[6]);
			}

			// read part disposition
			$di = 8;
			if ($struct->ctype_primary == 'text') {
			$di += 1;
			}
			else if ($struct->mimetype == 'message/rfc822') {
			$di += 3;
			}

			if (is_array($part[$di]) && count($part[$di]) == 2) {
			$struct->disposition = strtolower($part[$di][0]);

			if (is_array($part[$di][1])) {
			for ($n=0; $n<count($part[$di][1]); $n+=2) {
			$struct->d_parameters[strtolower($part[$di][1][$n])] = $part[$di][1][$n+1];
			}
			}
			}

			// get message/rfc822's child-parts
			if (is_array($part[8]) && $di != 8) {
			$struct->parts = array();
			for ($i=0, $count=0; $i<count($part[8]); $i++) {
			if (!is_array($part[8][$i])) {
			break;
			}
			$struct->parts[] = $this->structure_part($part[8][$i], ++$count, $struct->mime_id);
			}
			}

			// get part ID
			if (!empty($part[3])) {
			$struct->content_id = $part[3];
			$struct->headers['content-id'] = $part[3];

			if (empty($struct->disposition)) {
			$struct->disposition = 'inline';
			}
			}

			// fetch message headers if message/rfc822 or named part (could contain Content-Location header)
			if ($struct->ctype_primary == 'message' \|\| ($struct->ctype_parameters['name'] && !$struct->content_id)) {
			if (empty($mime_headers)) {
			$mime_headers = $this->conn->fetchPartHeader(
			$this->folder, $this->msg_uid, true, $struct->mime_id);
			}

			if (is_string($mime_headers)) {
			$struct->headers = rcube_mime::parse_headers($mime_headers) + $struct->headers;
			}
			else if (is_object($mime_headers)) {
			$struct->headers = get_object_vars($mime_headers) + $struct->headers;
			}

			// get real content-type of message/rfc822
			if ($struct->mimetype == 'message/rfc822') {
			// single-part
			if (!is_array($part[8][0])) {
			$struct->real_mimetype = strtolower($part[8][0] . '/' . $part[8][1]);
			}
			// multi-part
			else {
			for ($n=0; $n<count($part[8]); $n++) {
			if (!is_array($part[8][$n])) {
			break;
			}
			}
			$struct->real_mimetype = 'multipart/' . strtolower($part[8][$n]);
			}
			}

			if ($struct->ctype_primary == 'message' && empty($struct->parts)) {
			if (is_array($part[8]) && $di != 8) {
			$struct->parts[] = $this->structure_part($part[8], ++$count, $struct->mime_id);
			}
			}
			}

			// normalize filename property
			$this->set_part_filename($struct, $mime_headers);

			return $struct;
			}


			/**
			* Set attachment filename from message part structure
			*
			* @param rcube_message_part $part Part object
			* @param string $headers Part's raw headers
			*/
			protected function set_part_filename(&$part, $headers=null)
			{
			if (!empty($part->d_parameters['filename'])) {
			$filename_mime = $part->d_parameters['filename'];
			}
			else if (!empty($part->d_parameters['filename*'])) {
			$filename_encoded = $part->d_parameters['filename*'];
			}
			else if (!empty($part->ctype_parameters['name*'])) {
			$filename_encoded = $part->ctype_parameters['name*'];
			}
			// RFC2231 value continuations
			// TODO: this should be rewrited to support RFC2231 4.1 combinations
			else if (!empty($part->d_parameters['filename*0'])) {
			$i = 0;
			while (isset($part->d_parameters['filename*'.$i])) {
			$filename_mime .= $part->d_parameters['filename*'.$i];
			$i++;
			}
			// some servers (eg. dovecot-1.x) have no support for parameter value continuations
			// we must fetch and parse headers "manually"
			if ($i<2) {
			if (!$headers) {
			$headers = $this->conn->fetchPartHeader(
			$this->folder, $this->msg_uid, true, $part->mime_id);
			}
			$filename_mime = '';
			$i = 0;
			while (preg_match('/filename\'.$i.'\s=\s"([^"\n;]+)[";]*/', $headers, $matches)) {
			$filename_mime .= $matches[1];
			$i++;
			}
			}
			}
			else if (!empty($part->d_parameters['filename0'])) {
			$i = 0;
			while (isset($part->d_parameters['filename'.$i.''])) {
			$filename_encoded .= $part->d_parameters['filename'.$i.''];
			$i++;
			}
			if ($i<2) {
			if (!$headers) {
			$headers = $this->conn->fetchPartHeader(
			$this->folder, $this->msg_uid, true, $part->mime_id);
			}
			$filename_encoded = '';
			$i = 0; $matches = array();
			while (preg_match('/filename\'.$i.'\\s=\s"([^"\n;]+)[";]/', $headers, $matches)) {
			$filename_encoded .= $matches[1];
			$i++;
			}
			}
			}
			else if (!empty($part->ctype_parameters['name*0'])) {
			$i = 0;
			while (isset($part->ctype_parameters['name*'.$i])) {
			$filename_mime .= $part->ctype_parameters['name*'.$i];
			$i++;
			}
			if ($i<2) {
			if (!$headers) {
			$headers = $this->conn->fetchPartHeader(
			$this->folder, $this->msg_uid, true, $part->mime_id);
			}
			$filename_mime = '';
			$i = 0; $matches = array();
			while (preg_match('/\s+name\'.$i.'\s=\s"([^"\n;]+)[";]*/', $headers, $matches)) {
			$filename_mime .= $matches[1];
			$i++;
			}
			}
			}
			else if (!empty($part->ctype_parameters['name0'])) {
			$i = 0;
			while (isset($part->ctype_parameters['name'.$i.''])) {
			$filename_encoded .= $part->ctype_parameters['name'.$i.''];
			$i++;
			}
			if ($i<2) {
			if (!$headers) {
			$headers = $this->conn->fetchPartHeader(
			$this->folder, $this->msg_uid, true, $part->mime_id);
			}
			$filename_encoded = '';
			$i = 0; $matches = array();
			while (preg_match('/\s+name\'.$i.'\\s=\s"([^"\n;]+)[";]/', $headers, $matches)) {
			$filename_encoded .= $matches[1];
			$i++;
			}
			}
			}
			// read 'name' after rfc2231 parameters as it may contains truncated filename (from Thunderbird)
			else if (!empty($part->ctype_parameters['name'])) {
			$filename_mime = $part->ctype_parameters['name'];
			}
			// Content-Disposition
			else if (!empty($part->headers['content-description'])) {
			$filename_mime = $part->headers['content-description'];
			}
			else {
			return;
			}

			// decode filename
			if (!empty($filename_mime)) {
			if (!empty($part->charset)) {
			$charset = $part->charset;
			}
			else if (!empty($this->struct_charset)) {
			$charset = $this->struct_charset;
			}
			else {
			$charset = rc_detect_encoding($filename_mime, $this->default_charset);
			}

			$part->filename = rcube_mime::decode_mime_string($filename_mime, $charset);
			}
			else if (!empty($filename_encoded)) {
			// decode filename according to RFC 2231, Section 4
			if (preg_match("/^([^'])'[^']'(.*)$/", $filename_encoded, $fmatches)) {
			$filename_charset = $fmatches[1];
			$filename_encoded = $fmatches[2];
			}

			$part->filename = rcube_charset_convert(urldecode($filename_encoded), $filename_charset);
			}
			}


			/**
			* Get charset name from message structure (first part)
			*
			* @param array $structure Message structure
			*
			* @return string Charset name
			*/
			protected function structure_charset($structure)
			{
			while (is_array($structure)) {
			if (is_array($structure[2]) && $structure[2][0] == 'charset') {
			return $structure[2][1];
			}
			$structure = $structure[0];
			}
			}


			/**
			* Fetch message body of a specific message from the server
			*
			* @param int $uid Message UID
			* @param string $part Part number
			* @param rcube_message_part $o_part Part object created by get_structure()
			* @param mixed $print True to print part, ressource to write part contents in
			* @param resource $fp File pointer to save the message part
			* @param boolean $skip_charset_conv Disables charset conversion
			*
			* @return string Message/part body if not printed
			*/
			public function get_message_part($uid, $part=1, $o_part=NULL, $print=NULL, $fp=NULL, $skip_charset_conv=false)
			{
			if (!$this->check_connection()) {
			return null;
			}

			// get part data if not provided
			if (!is_object($o_part)) {
			$structure = $this->conn->getStructure($this->folder, $uid, true);
			$part_data = rcube_imap_generic::getStructurePartData($structure, $part);

			$o_part = new rcube_message_part;
			$o_part->ctype_primary = $part_data['type'];
			$o_part->encoding = $part_data['encoding'];
			$o_part->charset = $part_data['charset'];
			$o_part->size = $part_data['size'];
			}

			if ($o_part && $o_part->size) {
			$body = $this->conn->handlePartBody($this->folder, $uid, true,
			$part ? $part : 'TEXT', $o_part->encoding, $print, $fp);
			}

			if ($fp \|\| $print) {
			return true;
			}

			// convert charset (if text or message part)
			if ($body && preg_match('/^(text\|message)$/', $o_part->ctype_primary)) {
			// Remove NULL characters if any (#1486189)
			if (strpos($body, "\x00") !== false) {
			$body = str_replace("\x00", '', $body);
			}

			if (!$skip_charset_conv) {
			if (!$o_part->charset \|\| strtoupper($o_part->charset) == 'US-ASCII') {
			// try to extract charset information from HTML meta tag (#1488125)
			if ($o_part->ctype_secondary == 'html' && preg_match('/<meta[^>]+charset=([a-z0-9-_]+)/i', $body, $m)) {
			$o_part->charset = strtoupper($m[1]);
			}
			else {
			$o_part->charset = $this->default_charset;
			}
			}
			$body = rcube_charset_convert($body, $o_part->charset);
			}
			}

			return $body;
			}


			/**
			* Returns the whole message source as string (or saves to a file)
			*
			* @param int $uid Message UID
			* @param resource $fp File pointer to save the message
			*
			* @return string Message source string
			*/
			public function get_raw_body($uid, $fp=null)
			{
			if (!$this->check_connection()) {
			return null;
			}

			return $this->conn->handlePartBody($this->folder, $uid,
			true, null, null, false, $fp);
			}


			/**
			* Returns the message headers as string
			*
			* @param int $uid Message UID
			*
			* @return string Message headers string
			*/
			public function get_raw_headers($uid)
			{
			if (!$this->check_connection()) {
			return null;
			}

			return $this->conn->fetchPartHeader($this->folder, $uid, true);
			}


			/**
			* Sends the whole message source to stdout
			*/
			public function print_raw_body($uid)
			{
			if (!$this->check_connection()) {
			return;
			}

			$this->conn->handlePartBody($this->folder, $uid, true, NULL, NULL, true);
			}


			/**
			* Set message flag to one or several messages
			*
			* @param mixed $uids Message UIDs as array or comma-separated string, or '*'
			* @param string $flag Flag to set: SEEN, UNDELETED, DELETED, RECENT, ANSWERED, DRAFT, MDNSENT
			* @param string $folder Folder name
			* @param boolean $skip_cache True to skip message cache clean up
			*
			* @return boolean Operation status
			*/
			public function set_flag($uids, $flag, $folder=null, $skip_cache=false)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			if (!$this->check_connection()) {
			return false;
			}

			$flag = strtoupper($flag);
			list($uids, $all_mode) = $this->parse_uids($uids);

			if (strpos($flag, 'UN') === 0) {
			$result = $this->conn->unflag($folder, $uids, substr($flag, 2));
			}
			else {
			$result = $this->conn->flag($folder, $uids, $flag);
			}

			if ($result) {
			// reload message headers if cached
			// @TODO: update flags instead removing from cache
			if (!$skip_cache && ($mcache = $this->get_mcache_engine())) {
			$status = strpos($flag, 'UN') !== 0;
			$mflag = preg_replace('/^UN/', '', $flag);
			$mcache->change_flag($folder, $all_mode ? null : explode(',', $uids),
			$mflag, $status);
			}

			// clear cached counters
			if ($flag == 'SEEN' \|\| $flag == 'UNSEEN') {
			$this->clear_messagecount($folder, 'SEEN');
			$this->clear_messagecount($folder, 'UNSEEN');
			}
			else if ($flag == 'DELETED') {
			$this->clear_messagecount($folder, 'DELETED');
			}
			}

			return $result;
			}


			/**
			* Append a mail message (source) to a specific folder
			*
			* @param string $folder Target folder
			* @param string $message The message source string or filename
			* @param string $headers Headers string if $message contains only the body
			* @param boolean $is_file True if $message is a filename
			*
			* @return int\|bool Appended message UID or True on success, False on error
			*/
			public function save_message($folder, &$message, $headers='', $is_file=false)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			// make sure folder exists
			if ($this->folder_exists($folder)) {
			if ($is_file) {
			$saved = $this->conn->appendFromFile($folder, $message, $headers);
			}
			else {
			$saved = $this->conn->append($folder, $message);
			}
			}

			if ($saved) {
			// increase messagecount of the target folder
			$this->set_messagecount($folder, 'ALL', 1);
			}

			return $saved;
			}


			/**
			* Move a message from one folder to another
			*
			* @param mixed $uids Message UIDs as array or comma-separated string, or '*'
			* @param string $to_mbox Target folder
			* @param string $from_mbox Source folder
			*
			* @return boolean True on success, False on error
			*/
			public function move_message($uids, $to_mbox, $from_mbox='')
			{
			if (!strlen($from_mbox)) {
			$from_mbox = $this->folder;
			}

			if ($to_mbox === $from_mbox) {
			return false;
			}

			list($uids, $all_mode) = $this->parse_uids($uids);

			// exit if no message uids are specified
			if (empty($uids)) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			// make sure folder exists
			if ($to_mbox != 'INBOX' && !$this->folder_exists($to_mbox)) {
			if (in_array($to_mbox, $this->default_folders)) {
			if (!$this->create_folder($to_mbox, true)) {
			return false;
			}
			}
			else {
			return false;
			}
			}

			$config = rcmail::get_instance()->config;
			$to_trash = $to_mbox == $config->get('trash_mbox');

			// flag messages as read before moving them
			if ($to_trash && $config->get('read_when_deleted')) {
			// don't flush cache (4th argument)
			$this->set_flag($uids, 'SEEN', $from_mbox, true);
			}

			// move messages
			$moved = $this->conn->move($uids, $from_mbox, $to_mbox);

			// send expunge command in order to have the moved message
			// really deleted from the source folder
			if ($moved) {
			$this->expunge_message($uids, $from_mbox, false);
			$this->clear_messagecount($from_mbox);
			$this->clear_messagecount($to_mbox);
			}
			// moving failed
			else if ($to_trash && $config->get('delete_always', false)) {
			$moved = $this->delete_message($uids, $from_mbox);
			}

			if ($moved) {
			// unset threads internal cache
			unset($this->icache['threads']);

			// remove message ids from search set
			if ($this->search_set && $from_mbox == $this->folder) {
			// threads are too complicated to just remove messages from set
			if ($this->search_threads \|\| $all_mode) {
			$this->refresh_search();
			}
			else {
			$this->search_set->filter(explode(',', $uids));
			}
			}

			// remove cached messages
			// @TODO: do cache update instead of clearing it
			$this->clear_message_cache($from_mbox, $all_mode ? null : explode(',', $uids));
			}

			return $moved;
			}


			/**
			* Copy a message from one folder to another
			*
			* @param mixed $uids Message UIDs as array or comma-separated string, or '*'
			* @param string $to_mbox Target folder
			* @param string $from_mbox Source folder
			*
			* @return boolean True on success, False on error
			*/
			public function copy_message($uids, $to_mbox, $from_mbox='')
			{
			if (!strlen($from_mbox)) {
			$from_mbox = $this->folder;
			}

			list($uids, $all_mode) = $this->parse_uids($uids);

			// exit if no message uids are specified
			if (empty($uids)) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			// make sure folder exists
			if ($to_mbox != 'INBOX' && !$this->folder_exists($to_mbox)) {
			if (in_array($to_mbox, $this->default_folders)) {
			if (!$this->create_folder($to_mbox, true)) {
			return false;
			}
			}
			else {
			return false;
			}
			}

			// copy messages
			$copied = $this->conn->copy($uids, $from_mbox, $to_mbox);

			if ($copied) {
			$this->clear_messagecount($to_mbox);
			}

			return $copied;
			}


			/**
			* Mark messages as deleted and expunge them
			*
			* @param mixed $uids Message UIDs as array or comma-separated string, or '*'
			* @param string $folder Source folder
			*
			* @return boolean True on success, False on error
			*/
			public function delete_message($uids, $folder='')
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			list($uids, $all_mode) = $this->parse_uids($uids);

			// exit if no message uids are specified
			if (empty($uids)) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			$deleted = $this->conn->flag($folder, $uids, 'DELETED');

			if ($deleted) {
			// send expunge command in order to have the deleted message
			// really deleted from the folder
			$this->expunge_message($uids, $folder, false);
			$this->clear_messagecount($folder);
			unset($this->uid_id_map[$folder]);

			// unset threads internal cache
			unset($this->icache['threads']);

			// remove message ids from search set
			if ($this->search_set && $folder == $this->folder) {
			// threads are too complicated to just remove messages from set
			if ($this->search_threads \|\| $all_mode) {
			$this->refresh_search();
			}
			else {
			$this->search_set->filter(explode(',', $uids));
			}
			}

			// remove cached messages
			$this->clear_message_cache($folder, $all_mode ? null : explode(',', $uids));
			}

			return $deleted;
			}


			/**
			* Send IMAP expunge command and clear cache
			*
			* @param mixed $uids Message UIDs as array or comma-separated string, or '*'
			* @param string $folder Folder name
			* @param boolean $clear_cache False if cache should not be cleared
			*
			* @return boolean True on success, False on failure
			*/
			public function expunge_message($uids, $folder = null, $clear_cache = true)
			{
			if ($uids && $this->get_capability('UIDPLUS')) {
			list($uids, $all_mode) = $this->parse_uids($uids);
			}
			else {
			$uids = null;
			}

			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			if (!$this->check_connection()) {
			return false;
			}

			// force folder selection and check if folder is writeable
			// to prevent a situation when CLOSE is executed on closed
			// or EXPUNGE on read-only folder
			$result = $this->conn->select($folder);
			if (!$result) {
			return false;
			}

			if (!$this->conn->data['READ-WRITE']) {
			$this->conn->setError(rcube_imap_generic::ERROR_READONLY, "Folder is read-only");
			return false;
			}

			// CLOSE(+SELECT) should be faster than EXPUNGE
			if (empty($uids) \|\| $all_mode) {
			$result = $this->conn->close();
			}
			else {
			$result = $this->conn->expunge($folder, $uids);
			}

			if ($result && $clear_cache) {
			$this->clear_message_cache($folder, $all_mode ? null : explode(',', $uids));
			$this->clear_messagecount($folder);
			}

			return $result;
			}


			/* --------------------------------
			* folder managment
			* --------------------------------*/

			/**
			* Public method for listing subscribed folders.
			*
			* @param string $root Optional root folder
			* @param string $name Optional name pattern
			* @param string $filter Optional filter
			* @param string $rights Optional ACL requirements
			* @param bool $skip_sort Enable to return unsorted list (for better performance)
			*
			* @return array List of folders
			*/
			public function list_folders_subscribed($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
			{
			$cache_key = $root.':'.$name;
			if (!empty($filter)) {
			$cache_key .= ':'.(is_string($filter) ? $filter : serialize($filter));
			}
			$cache_key .= ':'.$rights;
			$cache_key = 'mailboxes.'.md5($cache_key);

			// get cached folder list
			$a_mboxes = $this->get_cache($cache_key);
			if (is_array($a_mboxes)) {
			return $a_mboxes;
			}

			$a_mboxes = $this->_list_folders_subscribed($root, $name, $filter, $rights);

			if (!is_array($a_mboxes)) {
			return array();
			}

			// filter folders list according to rights requirements
			if ($rights && $this->get_capability('ACL')) {
			$a_mboxes = $this->filter_rights($a_mboxes, $rights);
			}

			// INBOX should always be available
			if ((!$filter \|\| $filter == 'mail') && !in_array('INBOX', $a_mboxes)) {
			array_unshift($a_mboxes, 'INBOX');
			}

			// sort folders (always sort for cache)
			if (!$skip_sort \|\| $this->cache) {
			$a_mboxes = $this->sort_folder_list($a_mboxes);
			}

			// write folders list to cache
			$this->update_cache($cache_key, $a_mboxes);

			return $a_mboxes;
			}


			/**
			* protected method for folders listing (LSUB)
			*
			* @param string $root Optional root folder
			* @param string $name Optional name pattern
			* @param mixed $filter Optional filter
			* @param string $rights Optional ACL requirements
			*
			* @return array List of subscribed folders
			* @see rcube_imap::list_folders_subscribed()
			*/
			protected function _list_folders_subscribed($root='', $name='*', $filter=null, $rights=null)
			{
			$a_defaults = $a_out = array();

			// Give plugins a chance to provide a list of folders
			$data = rcmail::get_instance()->plugins->exec_hook('storage_folders',
			array('root' => $root, 'name' => $name, 'filter' => $filter, 'mode' => 'LSUB'));

			if (isset($data['folders'])) {
			$a_folders = $data['folders'];
			}
			else if (!$this->check_connection()) {
			return null;
			}
			else {
			// Server supports LIST-EXTENDED, we can use selection options
			$config = rcmail::get_instance()->config;
			// #1486225: Some dovecot versions returns wrong result using LIST-EXTENDED
			if (!$config->get('imap_force_lsub') && $this->get_capability('LIST-EXTENDED')) {
			// This will also set folder options, LSUB doesn't do that
			$a_folders = $this->conn->listMailboxes($root, $name,
			NULL, array('SUBSCRIBED'));

			// unsubscribe non-existent folders, remove from the list
			// we can do this only when LIST response is available
			if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
			foreach ($a_folders as $idx => $folder) {
			if (($opts = $this->conn->data['LIST'][$folder])
			&& in_array('\\NonExistent', $opts)
			) {
			$this->conn->unsubscribe($folder);
			unset($a_folders[$idx]);
			}
			}
			}
			}
			// retrieve list of folders from IMAP server using LSUB
			else {
			$a_folders = $this->conn->listSubscribed($root, $name);

			// unsubscribe non-existent folders, remove them from the list,
			// we can do this only when LIST response is available
			if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
			foreach ($a_folders as $idx => $folder) {
			if (!isset($this->conn->data['LIST'][$folder])
			\|\| in_array('\\Noselect', $this->conn->data['LIST'][$folder])
			) {
			// Some servers returns \Noselect for existing folders
			if (!$this->folder_exists($folder)) {
			$this->conn->unsubscribe($folder);
			unset($a_folders[$idx]);
			}
			}
			}
			}
			}
			}

			if (!is_array($a_folders) \|\| !sizeof($a_folders)) {
			$a_folders = array();
			}

			return $a_folders;
			}


			/**
			* Get a list of all folders available on the server
			*
			* @param string $root IMAP root dir
			* @param string $name Optional name pattern
			* @param mixed $filter Optional filter
			* @param string $rights Optional ACL requirements
			* @param bool $skip_sort Enable to return unsorted list (for better performance)
			*
			* @return array Indexed array with folder names
			*/
			public function list_folders($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
			{
			$cache_key = $root.':'.$name;
			if (!empty($filter)) {
			$cache_key .= ':'.(is_string($filter) ? $filter : serialize($filter));
			}
			$cache_key .= ':'.$rights;
			$cache_key = 'mailboxes.list.'.md5($cache_key);

			// get cached folder list
			$a_mboxes = $this->get_cache($cache_key);
			if (is_array($a_mboxes)) {
			return $a_mboxes;
			}

			// Give plugins a chance to provide a list of folders
			$data = rcmail::get_instance()->plugins->exec_hook('storage_folders',
			array('root' => $root, 'name' => $name, 'filter' => $filter, 'mode' => 'LIST'));

			if (isset($data['folders'])) {
			$a_mboxes = $data['folders'];
			}
			else {
			// retrieve list of folders from IMAP server
			$a_mboxes = $this->_list_folders($root, $name);
			}

			if (!is_array($a_mboxes)) {
			$a_mboxes = array();
			}

			// INBOX should always be available
			if ((!$filter \|\| $filter == 'mail') && !in_array('INBOX', $a_mboxes)) {
			array_unshift($a_mboxes, 'INBOX');
			}

			// cache folder attributes
			if ($root == '' && $name == '*' && empty($filter) && !empty($this->conn->data)) {
			$this->update_cache('mailboxes.attributes', $this->conn->data['LIST']);
			}

			// filter folders list according to rights requirements
			if ($rights && $this->get_capability('ACL')) {
			$a_folders = $this->filter_rights($a_folders, $rights);
			}

			// filter folders and sort them
			if (!$skip_sort) {
			$a_mboxes = $this->sort_folder_list($a_mboxes);
			}

			// write folders list to cache
			$this->update_cache($cache_key, $a_mboxes);

			return $a_mboxes;
			}


			/**
			* protected method for folders listing (LIST)
			*
			* @param string $root Optional root folder
			* @param string $name Optional name pattern
			*
			* @return array List of folders
			* @see rcube_imap::list_folders()
			*/
			protected function _list_folders($root='', $name='*')
			{
			if (!$this->check_connection()) {
			return null;
			}

			$result = $this->conn->listMailboxes($root, $name);

			if (!is_array($result)) {
			return array();
			}

			// #1486796: some server configurations doesn't
			// return folders in all namespaces, we'll try to detect that situation
			// and ask for these namespaces separately
			if ($root == '' && $name == '*') {
			$delim = $this->get_hierarchy_delimiter();
			$namespace = $this->get_namespace();
			$search = array();

			// build list of namespace prefixes
			foreach ((array)$namespace as $ns) {
			if (is_array($ns)) {
			foreach ($ns as $ns_data) {
			if (strlen($ns_data[0])) {
			$search[] = $ns_data[0];
			}
			}
			}
			}

			if (!empty($search)) {
			// go through all folders detecting namespace usage
			foreach ($result as $folder) {
			foreach ($search as $idx => $prefix) {
			if (strpos($folder, $prefix) === 0) {
			unset($search[$idx]);
			}
			}
			if (empty($search)) {
			break;
			}
			}

			// get folders in hidden namespaces and add to the result
			foreach ($search as $prefix) {
			$list = $this->conn->listMailboxes($prefix, $name);

			if (!empty($list)) {
			$result = array_merge($result, $list);
			}
			}
			}
			}

			return $result;
			}


			/**
			* Filter the given list of folders according to access rights
			*/
			protected function filter_rights($a_folders, $rights)
			{
			$regex = '/('.$rights.')/';
			foreach ($a_folders as $idx => $folder) {
			$myrights = join('', (array)$this->my_rights($folder));
			if ($myrights !== null && !preg_match($regex, $myrights)) {
			unset($a_folders[$idx]);
			}
			}

			return $a_folders;
			}


			/**
			* Get mailbox quota information
			* added by Nuny
			*
			* @return mixed Quota info or False if not supported
			*/
			public function get_quota()
			{
			if ($this->get_capability('QUOTA') && $this->check_connection()) {
			return $this->conn->getQuota();
			}

			return false;

			$part_type = iml_GetPartTypeCode($structure, $part);
			$o_part = new rcube_message_part;
			$o_part->ctype_primary = $part_type==0 ? 'text' : ($part_type==2 ? 'message' : 'other');
			$o_part->encoding = strtolower(iml_GetPartEncodingString($structure, $part));
			$o_part->charset = iml_GetPartCharset($structure, $part);
			}

			// TODO: Add caching for message parts

			if (!$part) $part = 'TEXT';

			$body = iil_C_HandlePartBody($this->conn, $this->mailbox, $uid, true, $part,
			$o_part->encoding, $print, $fp);

			if ($fp \|\| $print)
			return true;

			// convert charset (if text or message part)
			if ($o_part->ctype_primary=='text' \|\| $o_part->ctype_primary=='message') {
			// assume default if no charset specified
			if (empty($o_part->charset) \|\| strtolower($o_part->charset) == 'us-ascii')
			$o_part->charset = $this->default_charset;

			$body = rcube_charset_convert($body, $o_part->charset);
			}

			return $body;
			}


			/**
			* Fetch message body of a specific message from the server
			*
			* @param int Message UID
			* @return string Message/part body
			* @see rcube_imap::get_message_part()
			*/
			function &get_body($uid, $part=1)
			/**
			* Get folder size (size of all messages in a folder)
			*
			* @param string $folder Folder name
			*
			* @return int Folder size in bytes, False on error
			*/
			public function folder_size($folder)
			{
			$headers = $this->get_headers($uid);
			return rcube_charset_convert($this->get_message_part($uid, $part, NULL),
			$headers->charset ? $headers->charset : $this->default_charset);
			}


			/**
			* Returns the whole message source as string
			*
			* @param int Message UID
			* @return string Message source string
			*/
			function &get_raw_body($uid)
			{
			return iil_C_HandlePartBody($this->conn, $this->mailbox, $uid, true);
			}


			/**
			* Returns the message headers as string
			*
			* @param int Message UID
			* @return string Message headers string
			*/
			function &get_raw_headers($uid)
			{
			return iil_C_FetchPartHeader($this->conn, $this->mailbox, $uid, true);
			}


			/**
			* Sends the whole message source to stdout
			*
			* @param int Message UID
			*/
			function print_raw_body($uid)
			{
			iil_C_HandlePartBody($this->conn, $this->mailbox, $uid, true, NULL, NULL, true);
			}


			/**
			* Set message flag to one or several messages
			*
			* @param mixed Message UIDs as array or as comma-separated string
			* @param string Flag to set: SEEN, UNDELETED, DELETED, RECENT, ANSWERED, DRAFT, MDNSENT
			* @param string Folder name
			* @param boolean True to skip message cache clean up
			* @return boolean True on success, False on failure
			*/
			function set_flag($uids, $flag, $mbox_name=NULL, $skip_cache=false)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;

			$flag = strtoupper($flag);
			if (!is_array($uids))
			$uids = explode(',',$uids);

			if (strpos($flag, 'UN') === 0)
			$result = iil_C_UnFlag($this->conn, $mailbox, join(',', $uids), substr($flag, 2));
			else
			$result = iil_C_Flag($this->conn, $mailbox, join(',', $uids), $flag);

			// reload message headers if cached
			if ($this->caching_enabled && !$skip_cache) {
			$cache_key = $mailbox.'.msg';
			$this->remove_message_cache($cache_key, $uids);
			}

			// set nr of messages that were flaged
			$count = count($uids);

			// clear message count cache
			if ($result && $flag=='SEEN')
			$this->_set_messagecount($mailbox, 'UNSEEN', $count*(-1));
			else if ($result && $flag=='UNSEEN')
			$this->_set_messagecount($mailbox, 'UNSEEN', $count);
			else if ($result && $flag=='DELETED')
			$this->_set_messagecount($mailbox, 'ALL', $count*(-1));

			return $result;
			}


			/**
			* Remove message flag for one or several messages
			*
			* @param mixed Message UIDs as array or as comma-separated string
			* @param string Flag to unset: SEEN, DELETED, RECENT, ANSWERED, DRAFT, MDNSENT
			* @param string Folder name
			* @return boolean True on success, False on failure
			* @see set_flag
			*/
			function unset_flag($uids, $flag, $mbox_name=NULL)
			{
			return $this->set_flag($uids, 'UN'.$flag, $mbox_name);
			}


			/**
			* Append a mail message (source) to a specific mailbox
			*
			* @param string Target mailbox
			* @param string The message source string or filename
			* @param string Headers string if $message contains only the body
			* @param boolean True if $message is a filename
			*
			* @return boolean True on success, False on error
			*/
			function save_message($mbox_name, &$message, $headers='', $is_file=false)
			{
			$mailbox = $this->mod_mailbox($mbox_name);

			// make sure mailbox exists
			if (($mailbox == 'INBOX') \|\| in_array($mailbox, $this->_list_mailboxes())) {
			if ($is_file) {
			$separator = rcmail::get_instance()->config->header_delimiter();
			$saved = iil_C_AppendFromFile($this->conn, $mailbox, $message,
			$headers, $separator.$separator);
			if (!$this->check_connection()) {
			return 0;
			}
			else
			$saved = iil_C_Append($this->conn, $mailbox, $message);
			}

			if ($saved)
			{
			// increase messagecount of the target mailbox
			$this->_set_messagecount($mailbox, 'ALL', 1);
			}

			return $saved;
			}
			// @TODO: could we try to use QUOTA here?
			$result = $this->conn->fetchHeaderIndex($folder, '1:*', 'SIZE', false);


			/**
			* Move a message from one mailbox to another
			*
			* @param string List of UIDs to move, separated by comma
			* @param string Target mailbox
			* @param string Source mailbox
			* @return boolean True on success, False on error
			*/
			function move_message($uids, $to_mbox, $from_mbox='')
			{
			$fbox = $from_mbox;
			$tbox = $to_mbox;
			$to_mbox = $this->mod_mailbox($to_mbox);
			$from_mbox = $from_mbox ? $this->mod_mailbox($from_mbox) : $this->mailbox;

			// make sure mailbox exists
			if ($to_mbox != 'INBOX' && !in_array($to_mbox, $this->_list_mailboxes()))
			{
			if (in_array($tbox, $this->default_folders))
			$this->create_mailbox($tbox, TRUE);
			else
			return FALSE;
			}

			// convert the list of uids to array
			$a_uids = is_string($uids) ? explode(',', $uids) : (is_array($uids) ? $uids : NULL);

			// exit if no message uids are specified
			if (!is_array($a_uids) \|\| empty($a_uids))
			return false;

			// flag messages as read before moving them
			$config = rcmail::get_instance()->config;
			if ($config->get('read_when_deleted') && $tbox == $config->get('trash_mbox')) {
			// don't flush cache (4th argument)
			$this->set_flag($uids, 'SEEN', $fbox, true);
			}

			// move messages
			$iil_move = iil_C_Move($this->conn, join(',', $a_uids), $from_mbox, $to_mbox);
			$moved = !($iil_move === false \|\| $iil_move < 0);

			// send expunge command in order to have the moved message
			// really deleted from the source mailbox
			if ($moved) {
			$this->_expunge($from_mbox, FALSE, $a_uids);
			$this->_clear_messagecount($from_mbox);
			$this->_clear_messagecount($to_mbox);
			}
			// moving failed
			else if (rcmail::get_instance()->config->get('delete_always', false)) {
			return iil_C_Delete($this->conn, $from_mbox, join(',', $a_uids));
			}

			// remove message ids from search set
			if ($moved && $this->search_set && $from_mbox == $this->mailbox) {
			foreach ($a_uids as $uid)
			$a_mids[] = $this->_uid2id($uid, $from_mbox);
			$this->search_set = array_diff($this->search_set, $a_mids);
			}

			// update cached message headers
			$cache_key = $from_mbox.'.msg';
			if ($moved && $start_index = $this->get_message_cache_index_min($cache_key, $a_uids)) {
			// clear cache from the lowest index on
			$this->clear_message_cache($cache_key, $start_index);
			}

			return $moved;
			}


			/**
			* Mark messages as deleted and expunge mailbox
			*
			* @param string List of UIDs to move, separated by comma
			* @param string Source mailbox
			* @return boolean True on success, False on error
			*/
			function delete_message($uids, $mbox_name='')
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;

			// convert the list of uids to array
			$a_uids = is_string($uids) ? explode(',', $uids) : (is_array($uids) ? $uids : NULL);

			// exit if no message uids are specified
			if (!is_array($a_uids) \|\| empty($a_uids))
			return false;

			$deleted = iil_C_Delete($this->conn, $mailbox, join(',', $a_uids));

			// send expunge command in order to have the deleted message
			// really deleted from the mailbox
			if ($deleted)
			{
			$this->_expunge($mailbox, FALSE, $a_uids);
			$this->_clear_messagecount($mailbox);
			unset($this->uid_id_map[$mailbox]);
			}

			// remove message ids from search set
			if ($deleted && $this->search_set && $mailbox == $this->mailbox) {
			foreach ($a_uids as $uid)
			$a_mids[] = $this->_uid2id($uid, $mailbox);
			$this->search_set = array_diff($this->search_set, $a_mids);
			}

			// remove deleted messages from cache
			$cache_key = $mailbox.'.msg';
			if ($deleted && $start_index = $this->get_message_cache_index_min($cache_key, $a_uids)) {
			// clear cache from the lowest index on
			$this->clear_message_cache($cache_key, $start_index);
			}

			return $deleted;
			}


			/**
			* Clear all messages in a specific mailbox
			*
			* @param string Mailbox name
			* @return int Above 0 on success
			*/
			function clear_mailbox($mbox_name=NULL)
			{
			$mailbox = !empty($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			$msg_count = $this->_messagecount($mailbox, 'ALL');

			if ($msg_count>0)
			{
			$cleared = iil_C_ClearFolder($this->conn, $mailbox);

			// make sure the message count cache is cleared as well
			if ($cleared)
			{
			$this->clear_message_cache($mailbox.'.msg');
			$a_mailbox_cache = $this->get_cache('messagecount');
			unset($a_mailbox_cache[$mailbox]);
			$this->update_cache('messagecount', $a_mailbox_cache);
			if (is_array($result)) {
			$result = array_sum($result);
			}

			return $cleared;
			}
			else
			return 0;

			return $result;
			}


			/**
			* Send IMAP expunge command and clear cache
			*
			* @param string Mailbox name
			* @param boolean False if cache should not be cleared
			* @return boolean True on success
			*/
			function expunge($mbox_name='', $clear_cache=TRUE)
			/**
			* Subscribe to a specific folder(s)
			*
			* @param array $folders Folder name(s)
			*
			* @return boolean True on success
			*/
			public function subscribe($folders)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			return $this->_expunge($mailbox, $clear_cache);
			// let this common function do the main work
			return $this->change_subscription($folders, 'subscribe');
			}


			/**
			* Send IMAP expunge command and clear cache
			*
			* @see rcube_imap::expunge()
			* @param string Mailbox name
			* @param boolean False if cache should not be cleared
			* @param string List of UIDs to remove, separated by comma
			* @return boolean True on success
			* @access private
			*/
			private function _expunge($mailbox, $clear_cache=TRUE, $uids=NULL)
			/**
			* Unsubscribe folder(s)
			*
			* @param array $a_mboxes Folder name(s)
			*
			* @return boolean True on success
			*/
			public function unsubscribe($folders)
			{
			if ($uids && $this->get_capability('UIDPLUS'))
			$a_uids = is_array($uids) ? join(',', $uids) : $uids;
			else
			$a_uids = NULL;

			$result = iil_C_Expunge($this->conn, $mailbox, $a_uids);

			if ($result>=0 && $clear_cache)
			{
			$this->clear_message_cache($mailbox.'.msg');
			$this->_clear_messagecount($mailbox);
			}

			return $result;
			// let this common function do the main work
			return $this->change_subscription($folders, 'unsubscribe');
			}


			/* --------------------------------
			* folder managment
			* --------------------------------*/


			/**
			* Get a list of all folders available on the IMAP server
			*
			* @param string IMAP root dir
			* @return array Indexed array with folder names
			*/
			function list_unsubscribed($root='')
			/**
			* Create a new folder on the server and register it in local cache
			*
			* @param string $folder New folder name
			* @param boolean $subscribe True if the new folder should be subscribed
			*
			* @return boolean True on success
			*/
			public function create_folder($folder, $subscribe=false)
			{
			static $sa_unsubscribed;

			if (is_array($sa_unsubscribed))
			return $sa_unsubscribed;

			// retrieve list of folders from IMAP server
			$a_mboxes = iil_C_ListMailboxes($this->conn, $this->mod_mailbox($root), '*');
			if (!$this->check_connection()) {
			return false;
			}

			// modify names with root dir
			foreach ($a_mboxes as $mbox_name)
			{
			$name = $this->mod_mailbox($mbox_name, 'out');
			if (strlen($name))
			$a_folders[] = $name;
			}
			$result = $this->conn->createFolder($folder);

			// filter folders and sort them
			$sa_unsubscribed = $this->_sort_mailbox_list($a_folders);
			return $sa_unsubscribed;
			// try to subscribe it
			if ($result) {
			// clear cache
			$this->clear_cache('mailboxes', true);

			if ($subscribe) {
			$this->subscribe($folder);
			}
			}

			return $result;
			}


			/**
			* Get mailbox quota information
			* added by Nuny
			*
			* @return mixed Quota info or False if not supported
			*/
			function get_quota()
			/**
			* Set a new name to an existing folder
			*
			* @param string $folder Folder to rename
			* @param string $new_name New folder name
			*
			* @return boolean True on success
			*/
			public function rename_folder($folder, $new_name)
			{
			if ($this->get_capability('QUOTA'))
			return iil_C_GetQuota($this->conn);

			return FALSE;
			if (!strlen($new_name)) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			$delm = $this->get_hierarchy_delimiter();

			// get list of subscribed folders
			if ((strpos($folder, '%') === false) && (strpos($folder, '*') === false)) {
			$a_subscribed = $this->_list_folders_subscribed('', $folder . $delm . '*');
			$subscribed = $this->folder_exists($folder, true);
			}
			else {
			$a_subscribed = $this->_list_folders_subscribed();
			$subscribed = in_array($folder, $a_subscribed);
			}

			$result = $this->conn->renameFolder($folder, $new_name);

			if ($result) {
			// unsubscribe the old folder, subscribe the new one
			if ($subscribed) {
			$this->conn->unsubscribe($folder);
			$this->conn->subscribe($new_name);
			}

			// check if folder children are subscribed
			foreach ($a_subscribed as $c_subscribed) {
			if (strpos($c_subscribed, $folder.$delm) === 0) {
			$this->conn->unsubscribe($c_subscribed);
			$this->conn->subscribe(preg_replace('/^'.preg_quote($folder, '/').'/',
			$new_name, $c_subscribed));

			// clear cache
			$this->clear_message_cache($c_subscribed);
			}
			}

			// clear cache
			$this->clear_message_cache($folder);
			$this->clear_cache('mailboxes', true);
			}

			return $result;
			}


			/**
			* Subscribe to a specific mailbox(es)
			*
			* @param array Mailbox name(s)
			* @return boolean True on success
			*/
			function subscribe($a_mboxes)
			/**
			* Remove folder from server
			*
			* @param string $folder Folder name
			*
			* @return boolean True on success
			*/
			function delete_folder($folder)
			{
			if (!is_array($a_mboxes))
			$a_mboxes = array($a_mboxes);
			$delm = $this->get_hierarchy_delimiter();

			// let this common function do the main work
			return $this->_change_subscription($a_mboxes, 'subscribe');
			}
			if (!$this->check_connection()) {
			return false;
			}


			/**
			* Unsubscribe mailboxes
			*
			* @param array Mailbox name(s)
			* @return boolean True on success
			*/
			function unsubscribe($a_mboxes)
			{
			if (!is_array($a_mboxes))
			$a_mboxes = array($a_mboxes);

			// let this common function do the main work
			return $this->_change_subscription($a_mboxes, 'unsubscribe');
			}


			/**
			* Create a new mailbox on the server and register it in local cache
			*
			* @param string New mailbox name (as utf-7 string)
			* @param boolean True if the new mailbox should be subscribed
			* @param string Name of the created mailbox, false on error
			*/
			function create_mailbox($name, $subscribe=FALSE)
			{
			$result = FALSE;

			// reduce mailbox name to 100 chars
			$name = substr($name, 0, 100);

			$abs_name = $this->mod_mailbox($name);
			$a_mailbox_cache = $this->get_cache('mailboxes');

			if (strlen($abs_name) && (!is_array($a_mailbox_cache) \|\| !in_array($abs_name, $a_mailbox_cache)))
			$result = iil_C_CreateFolder($this->conn, $abs_name);

			// try to subscribe it
			if ($result && $subscribe)
			$this->subscribe($name);

			return $result ? $name : FALSE;
			}


			/**
			* Set a new name to an existing mailbox
			*
			* @param string Mailbox to rename (as utf-7 string)
			* @param string New mailbox name (as utf-7 string)
			* @return string Name of the renames mailbox, False on error
			*/
			function rename_mailbox($mbox_name, $new_name)
			{
			$result = FALSE;

			// encode mailbox name and reduce it to 100 chars
			$name = substr($new_name, 0, 100);

			// make absolute path
			$mailbox = $this->mod_mailbox($mbox_name);
			$abs_name = $this->mod_mailbox($name);

			// check if mailbox is subscribed
			$a_subscribed = $this->_list_mailboxes();
			$subscribed = in_array($mailbox, $a_subscribed);

			// unsubscribe folder
			if ($subscribed)
			iil_C_UnSubscribe($this->conn, $mailbox);

			if (strlen($abs_name))
			$result = iil_C_RenameFolder($this->conn, $mailbox, $abs_name);

			if ($result)
			{
			$delm = $this->get_hierarchy_delimiter();

			// check if mailbox children are subscribed
			foreach ($a_subscribed as $c_subscribed)
			if (preg_match('/^'.preg_quote($mailbox.$delm, '/').'/', $c_subscribed))
			{
			iil_C_UnSubscribe($this->conn, $c_subscribed);
			iil_C_Subscribe($this->conn, preg_replace('/^'.preg_quote($mailbox, '/').'/', $abs_name, $c_subscribed));
			}

			// clear cache
			$this->clear_message_cache($mailbox.'.msg');
			$this->clear_cache('mailboxes');
			}

			// try to subscribe it
			if ($result && $subscribed)
			iil_C_Subscribe($this->conn, $abs_name);

			return $result ? $name : FALSE;
			}


			/**
			* Remove mailboxes from server
			*
			* @param string Mailbox name(s) string/array
			* @return boolean True on success
			*/
			function delete_mailbox($mbox_name)
			{
			$deleted = FALSE;

			if (is_array($mbox_name))
			$a_mboxes = $mbox_name;
			else if (is_string($mbox_name) && strlen($mbox_name))
			$a_mboxes = explode(',', $mbox_name);

			$all_mboxes = iil_C_ListMailboxes($this->conn, $this->mod_mailbox($root), '*');

			if (is_array($a_mboxes))
			foreach ($a_mboxes as $mbox_name)
			{
			$mailbox = $this->mod_mailbox($mbox_name);

			// unsubscribe mailbox before deleting
			iil_C_UnSubscribe($this->conn, $mailbox);
			// get list of folders
			if ((strpos($folder, '%') === false) && (strpos($folder, '*') === false)) {
			$sub_mboxes = $this->list_folders('', $folder . $delm . '*');
			}
			else {
			$sub_mboxes = $this->list_folders();
			}

			// send delete command to server
			$result = iil_C_DeleteFolder($this->conn, $mailbox);
			if ($result >= 0) {
			$deleted = TRUE;
			$this->clear_message_cache($mailbox.'.msg');
			}

			foreach ($all_mboxes as $c_mbox)
			{
			$regex = preg_quote($mailbox . $this->delimiter, '/');
			$regex = '/^' . $regex . '/';
			if (preg_match($regex, $c_mbox))
			{
			iil_C_UnSubscribe($this->conn, $c_mbox);
			$result = iil_C_DeleteFolder($this->conn, $c_mbox);
			if ($result >= 0) {
			$deleted = TRUE;
			$this->clear_message_cache($c_mbox.'.msg');
			}
			}
			}
			$result = $this->conn->deleteFolder($folder);

			if ($result) {
			// unsubscribe folder
			$this->conn->unsubscribe($folder);

			foreach ($sub_mboxes as $c_mbox) {
			if (strpos($c_mbox, $folder.$delm) === 0) {
			$this->conn->unsubscribe($c_mbox);
			if ($this->conn->deleteFolder($c_mbox)) {
			$this->clear_message_cache($c_mbox);
			}
			}
			}

			// clear folder-related cache
			$this->clear_message_cache($folder);
			$this->clear_cache('mailboxes', true);
			}

			// clear mailboxlist cache
			if ($deleted)
			$this->clear_cache('mailboxes');

			return $deleted;
			return $result;
			}


			/**
			* Create all folders specified as default
			*/
			function create_default_folders()
			/**
			* Create all folders specified as default
			*/
			public function create_default_folders()
			{
			$a_folders = iil_C_ListMailboxes($this->conn, $this->mod_mailbox(''), '*');
			$a_subscribed = iil_C_ListSubscribed($this->conn, $this->mod_mailbox(''), '*');

			// create default folders if they do not exist
			foreach ($this->default_folders as $folder)
			{
			$abs_name = $this->mod_mailbox($folder);
			if (!in_array($abs_name, $a_folders))
			$this->create_mailbox($folder, TRUE);
			else if (!in_array($abs_name, $a_subscribed))
			$this->subscribe($folder);
			}
			}



			/* --------------------------------
			* internal caching methods
			* --------------------------------*/

			/**
			* @access private
			*/
			function set_caching($set)
			{
			if ($set && is_object($this->db))
			$this->caching_enabled = TRUE;
			else
			$this->caching_enabled = FALSE;
			}

			/**
			* @access private
			*/
			function get_cache($key)
			{
			// read cache (if it was not read before)
			if (!count($this->cache) && $this->caching_enabled)
			{
			return $this->_read_cache_record($key);
			}

			return $this->cache[$key];
			}

			/**
			* @access private
			*/
			function update_cache($key, $data)
			{
			$this->cache[$key] = $data;
			$this->cache_changed = TRUE;
			$this->cache_changes[$key] = TRUE;
			}

			/**
			* @access private
			*/
			function write_cache()
			{
			if ($this->caching_enabled && $this->cache_changed)
			{
			foreach ($this->cache as $key => $data)
			{
			if ($this->cache_changes[$key])
			$this->_write_cache_record($key, serialize($data));
			// create default folders if they do not exist
			foreach ($this->default_folders as $folder) {
			if (!$this->folder_exists($folder)) {
			$this->create_folder($folder, true);
			}
			else if (!$this->folder_exists($folder, true)) {
			$this->subscribe($folder);
			}
			}
			}
			}

			/**
			* @access private
			*/
			function clear_cache($key=NULL)

			/**
			* Checks if folder exists and is subscribed
			*
			* @param string $folder Folder name
			* @param boolean $subscription Enable subscription checking
			*
			* @return boolean TRUE or FALSE
			*/
			public function folder_exists($folder, $subscription=false)
			{
			if (!$this->caching_enabled)
			return;

			if ($key===NULL)
			{
			foreach ($this->cache as $key => $data)
			$this->_clear_cache_record($key);

			$this->cache = array();
			$this->cache_changed = FALSE;
			$this->cache_changes = array();
			}
			else
			{
			$this->_clear_cache_record($key);
			$this->cache_changes[$key] = FALSE;
			unset($this->cache[$key]);
			}
			}

			/**
			* @access private
			*/
			private function _read_cache_record($key)
			{
			if ($this->db)
			{
			// get cached data from DB
			$sql_result = $this->db->query(
			"SELECT cache_id, data, cache_key
			FROM ".get_table_name('cache')."
			WHERE user_id=?
			AND cache_key LIKE 'IMAP.%'",
			$_SESSION['user_id']);

			while ($sql_arr = $this->db->fetch_assoc($sql_result))
			{
			$sql_key = preg_replace('/^IMAP\./', '', $sql_arr['cache_key']);
			$this->cache_keys[$sql_key] = $sql_arr['cache_id'];
			if (!isset($this->cache[$sql_key]))
			$this->cache[$sql_key] = $sql_arr['data'] ? unserialize($sql_arr['data']) : FALSE;
			}
			}

			return $this->cache[$key];
			}

			/**
			* @access private
			*/
			private function _write_cache_record($key, $data)
			{
			if (!$this->db)
			return FALSE;

			// update existing cache record
			if ($this->cache_keys[$key])
			{
			$this->db->query(
			"UPDATE ".get_table_name('cache')."
			SET created=". $this->db->now().", data=?
			WHERE user_id=?
			AND cache_key=?",
			$data,
			$_SESSION['user_id'],
			'IMAP.'.$key);
			}
			// add new cache record
			else
			{
			$this->db->query(
			"INSERT INTO ".get_table_name('cache')."
			(created, user_id, cache_key, data)
			VALUES (".$this->db->now().", ?, ?, ?)",
			$_SESSION['user_id'],
			'IMAP.'.$key,
			$data);

			// get cache entry ID for this key
			$sql_result = $this->db->query(
			"SELECT cache_id
			FROM ".get_table_name('cache')."
			WHERE user_id=?
			AND cache_key=?",
			$_SESSION['user_id'],
			'IMAP.'.$key);

			if ($sql_arr = $this->db->fetch_assoc($sql_result))
			$this->cache_keys[$key] = $sql_arr['cache_id'];
			}
			}

			/**
			* @access private
			*/
			private function _clear_cache_record($key)
			{
			$this->db->query(
			"DELETE FROM ".get_table_name('cache')."
			WHERE user_id=?
			AND cache_key=?",
			$_SESSION['user_id'],
			'IMAP.'.$key);

			unset($this->cache_keys[$key]);
			}



			/* --------------------------------
			* message caching methods
			* --------------------------------*/


			/**
			* Checks if the cache is up-to-date
			*
			* @param string Mailbox name
			* @param string Internal cache key
			* @return int Cache status: -3 = off, -2 = incomplete, -1 = dirty
			*/
			private function check_cache_status($mailbox, $cache_key)
			{
			if (!$this->caching_enabled)
			return -3;

			$cache_index = $this->get_message_cache_index($cache_key);
			$msg_count = $this->_messagecount($mailbox);
			$cache_count = count($cache_index);

			// empty mailbox
			if (!$msg_count)
			return $cache_count ? -2 : 1;

			// @TODO: We've got one big performance problem in cache status checking method
			// E.g. mailbox contains 1000 messages, in cache table we've got first 100
			// of them. Now if we want to display only that 100 (which we've got)
			// check_cache_status returns 'incomplete' and messages are fetched
			// from IMAP instead of DB.

			if ($cache_count==$msg_count) {
			if ($this->skip_deleted) {
			$h_index = iil_C_FetchHeaderIndex($this->conn, $mailbox, "1:*", 'UID', $this->skip_deleted);

			if (sizeof($h_index) == $cache_count) {
			$cache_index = array_flip($cache_index);
			foreach ($h_index as $idx => $uid)
			unset($cache_index[$uid]);

			if (empty($cache_index))
			return 1;
			}
			return -2;
			} else {
			// get UID of message with highest index
			$uid = iil_C_ID2UID($this->conn, $mailbox, $msg_count);
			$cache_uid = array_pop($cache_index);

			// uids of highest message matches -> cache seems OK
			if ($cache_uid == $uid)
			return 1;
			}
			// cache is dirty
			return -1;
			}
			// if cache count differs less than 10% report as dirty
			else if (abs($msg_count - $cache_count) < $msg_count/10)
			return -1;
			else
			return -2;
			}

			/**
			* @access private
			*/
			private function get_message_cache($key, $from, $to, $sort_field, $sort_order)
			{
			$cache_key = "$key:$from:$to:$sort_field:$sort_order";
			$db_header_fields = array('idx', 'uid', 'subject', 'from', 'to', 'cc', 'date', 'size');

			$config = rcmail::get_instance()->config;

			// use idx sort for sorting by Date with index_sort=true or for unknown field
			if (($sort_field == 'date' && $this->index_sort)
			\|\| !in_array($sort_field, $db_header_fields)) {
			$sort_field = 'idx';
			}

			if ($this->caching_enabled && !isset($this->cache[$cache_key]))
			{
			$this->cache[$cache_key] = array();
			$sql_result = $this->db->limitquery(
			"SELECT idx, uid, headers
			FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			ORDER BY ".$this->db->quoteIdentifier($sort_field)." ".strtoupper($sort_order),
			$from,
			$to-$from,
			$_SESSION['user_id'],
			$key);

			while ($sql_arr = $this->db->fetch_assoc($sql_result))
			{
			$uid = $sql_arr['uid'];
			$this->cache[$cache_key][$uid] = $this->db->decode(unserialize($sql_arr['headers']));

			// featch headers if unserialize failed
			if (empty($this->cache[$cache_key][$uid]))
			$this->cache[$cache_key][$uid] = iil_C_FetchHeader($this->conn, preg_replace('/.msg$/', '', $key), $uid, true, $this->fetch_add_headers);
			}
			}

			return $this->cache[$cache_key];
			}

			/**
			* @access private
			*/
			private function &get_cached_message($key, $uid)
			{
			$internal_key = '__single_msg';

			if ($this->caching_enabled && !isset($this->cache[$internal_key][$uid]))
			{
			$sql_result = $this->db->query(
			"SELECT idx, headers, structure
			FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			AND uid=?",
			$_SESSION['user_id'],
			$key,
			$uid);

			if ($sql_arr = $this->db->fetch_assoc($sql_result))
			{
			$this->uid_id_map[preg_replace('/\.msg$/', '', $key)][$uid] = $sql_arr['idx'];
			$this->cache[$internal_key][$uid] = $this->db->decode(unserialize($sql_arr['headers']));
			if (is_object($this->cache[$internal_key][$uid]) && !empty($sql_arr['structure']))
			$this->cache[$internal_key][$uid]->structure = $this->db->decode(unserialize($sql_arr['structure']));
			}
			}

			return $this->cache[$internal_key][$uid];
			}

			/**
			* @access private
			*/
			private function get_message_cache_index($key, $force=FALSE, $sort_field='idx', $sort_order='ASC')
			{
			static $sa_message_index = array();

			// empty key -> empty array
			if (!$this->caching_enabled \|\| empty($key))
			return array();

			if (!empty($sa_message_index[$key]) && !$force)
			return $sa_message_index[$key];

			// use idx sort for sorting by Date with index_sort=true
			if ($sort_field == 'date' && $this->index_sort)
			$sort_field = 'idx';

			$sa_message_index[$key] = array();
			$sql_result = $this->db->query(
			"SELECT idx, uid
			FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			ORDER BY ".$this->db->quote_identifier($sort_field)." ".$sort_order,
			$_SESSION['user_id'],
			$key);

			while ($sql_arr = $this->db->fetch_assoc($sql_result))
			$sa_message_index[$key][$sql_arr['idx']] = $sql_arr['uid'];

			return $sa_message_index[$key];
			}

			/**
			* @access private
			*/
			private function add_message_cache($key, $index, $headers, $struct=null, $force=false)
			{
			if (empty($key) \|\| !is_object($headers) \|\| empty($headers->uid))
			return;

			// add to internal (fast) cache
			$this->cache['__single_msg'][$headers->uid] = clone $headers;
			$this->cache['__single_msg'][$headers->uid]->structure = $struct;

			// no further caching
			if (!$this->caching_enabled)
			return;

			// check for an existing record (probly headers are cached but structure not)
			if (!$force) {
			$sql_result = $this->db->query(
			"SELECT message_id
			FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			AND uid=?",
			$_SESSION['user_id'],
			$key,
			$headers->uid);
			if ($sql_arr = $this->db->fetch_assoc($sql_result))
			$message_id = $sql_arr['message_id'];
			}

			// update cache record
			if ($message_id)
			{
			$this->db->query(
			"UPDATE ".get_table_name('messages')."
			SET idx=?, headers=?, structure=?
			WHERE message_id=?",
			$index,
			serialize($this->db->encode(clone $headers)),
			is_object($struct) ? serialize($this->db->encode(clone $struct)) : NULL,
			$message_id
			);
			}
			else // insert new record
			{
			$this->db->query(
			"INSERT INTO ".get_table_name('messages')."
			(user_id, del, cache_key, created, idx, uid, subject, ".$this->db->quoteIdentifier('from').", ".$this->db->quoteIdentifier('to').", cc, date, size, headers, structure)
			VALUES (?, 0, ?, ".$this->db->now().", ?, ?, ?, ?, ?, ?, ".$this->db->fromunixtime($headers->timestamp).", ?, ?, ?)",
			$_SESSION['user_id'],
			$key,
			$index,
			$headers->uid,
			(string)mb_substr($this->db->encode($this->decode_header($headers->subject, TRUE)), 0, 128),
			(string)mb_substr($this->db->encode($this->decode_header($headers->from, TRUE)), 0, 128),
			(string)mb_substr($this->db->encode($this->decode_header($headers->to, TRUE)), 0, 128),
			(string)mb_substr($this->db->encode($this->decode_header($headers->cc, TRUE)), 0, 128),
			(int)$headers->size,
			serialize($this->db->encode(clone $headers)),
			is_object($struct) ? serialize($this->db->encode(clone $struct)) : NULL
			);
			}
			}

			/**
			* @access private
			*/
			private function remove_message_cache($key, $ids, $idx=false)
			{
			if (!$this->caching_enabled)
			return;

			$this->db->query(
			"DELETE FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			AND ".($idx ? "idx" : "uid")." IN (".$this->db->array2list($ids, 'integer').")",
			$_SESSION['user_id'],
			$key);
			}

			/**
			* @access private
			*/
			private function clear_message_cache($key, $start_index=1)
			{
			if (!$this->caching_enabled)
			return;

			$this->db->query(
			"DELETE FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?
			AND idx>=?",
			$_SESSION['user_id'], $key, $start_index);
			}

			/**
			* @access private
			*/
			private function get_message_cache_index_min($key, $uids=NULL)
			{
			if (!$this->caching_enabled)
			return;

			$sql_result = $this->db->query(
			"SELECT MIN(idx) AS minidx
			FROM ".get_table_name('messages')."
			WHERE user_id=?
			AND cache_key=?"
			.(!empty($uids) ? " AND uid IN (".$this->db->array2list($uids, 'integer').")" : ''),
			$_SESSION['user_id'],
			$key);

			if ($sql_arr = $this->db->fetch_assoc($sql_result))
			return $sql_arr['minidx'];
			else
			return 0;
			}


			/* --------------------------------
			* encoding/decoding methods
			* --------------------------------*/

			/**
			* Split an address list into a structured array list
			*
			* @param string Input string
			* @param int List only this number of addresses
			* @param boolean Decode address strings
			* @return array Indexed list of addresses
			*/
			function decode_address_list($input, $max=null, $decode=true)
			{
			$a = $this->_parse_address_list($input, $decode);
			$out = array();
			// Special chars as defined by RFC 822 need to in quoted string (or escaped).
			$special_chars = '[\<\>\\\.\[\]@,;:"]';

			if (!is_array($a))
			return $out;

			$c = count($a);
			$j = 0;

			foreach ($a as $val)
			{
			$j++;
			$address = $val['address'];
			$name = preg_replace(array('/^[\'"]/', '/[\'"]$/'), '', trim($val['name']));
			if ($name && $address && $name != $address)
			$string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address);
			else if ($address)
			$string = $address;
			else if ($name)
			$string = $name;

			$out[$j] = array('name' => $name,
			'mailto' => $address,
			'string' => $string);

			if ($max && $j==$max)
			break;
			}

			return $out;
			}


			/**
			* Decode a Microsoft Outlook TNEF part (winmail.dat)
			*
			* @param object rcube_message_part Message part to decode
			* @param string UID of the message
			* @return array List of rcube_message_parts extracted from windmail.dat
			*/
			function tnef_decode(&$part, $uid)
			{
			if (!isset($part->body))
			$part->body = $this->get_message_part($uid, $part->mime_id, $part);

			$pid = 0;
			$tnef_parts = array();
			$tnef_arr = tnef_decode($part->body);
			foreach ($tnef_arr as $winatt) {
			$tpart = new rcube_message_part;
			$tpart->filename = $winatt["name"];
			$tpart->encoding = 'stream';
			$tpart->ctype_primary = $winatt["type0"];
			$tpart->ctype_secondary = $winatt["type1"];
			$tpart->mimetype = strtolower($winatt["type0"] . "/" . $winatt["type1"]);
			$tpart->mime_id = "winmail." . $part->mime_id . ".$pid";
			$tpart->size = $winatt["size"];
			$tpart->body = $winatt['stream'];

			$tnef_parts[] = $tpart;
			$pid++;
			}

			return $tnef_parts;
			}


			/**
			* Decode a message header value
			*
			* @param string Header value
			* @param boolean Remove quotes if necessary
			* @return string Decoded string
			*/
			function decode_header($input, $remove_quotes=FALSE)
			{
			$str = rcube_imap::decode_mime_string((string)$input, $this->default_charset);
			if ($str{0}=='"' && $remove_quotes)
			$str = str_replace('"', '', $str);

			return $str;
			}


			/**
			* Decode a mime-encoded string to internal charset
			*
			* @param string $input Header value
			* @param string $fallback Fallback charset if none specified
			*
			* @return string Decoded string
			* @static
			*/
			public static function decode_mime_string($input, $fallback=null)
			{
			// Initialize variable
			$out = '';

			// Iterate instead of recursing, this way if there are too many values we don't have stack overflows
			// rfc: all line breaks or other characters not found
			// in the Base64 Alphabet must be ignored by decoding software
			// delete all blanks between MIME-lines, differently we can
			// receive unnecessary blanks and broken utf-8 symbols
			$input = preg_replace("/\?=\s+=\?/", '?==?', $input);

			// Check if there is stuff to decode
			if (strpos($input, '=?') !== false) {
			// Loop through the string to decode all occurences of =? ?= into the variable $out
			while(($pos = strpos($input, '=?')) !== false) {
			// Append everything that is before the text to be decoded
			$out .= substr($input, 0, $pos);

			// Get the location of the text to decode
			$end_cs_pos = strpos($input, "?", $pos+2);
			$end_en_pos = strpos($input, "?", $end_cs_pos+1);
			$end_pos = strpos($input, "?=", $end_en_pos+1);

			// Extract the encoded string
			$encstr = substr($input, $pos+2, ($end_pos-$pos-2));
			// Extract the remaining string
			$input = substr($input, $end_pos+2);

			// Decode the string fragement
			$out .= rcube_imap::_decode_mime_string_part($encstr);
			}

			// Deocde the rest (if any)
			if (strlen($input) != 0)
			$out .= rcube_imap::decode_mime_string($input, $fallback);

			// return the results
			return $out;
			}

			// no encoding information, use fallback
			return rcube_charset_convert($input,
			!empty($fallback) ? $fallback : rcmail::get_instance()->config->get('default_charset', 'ISO-8859-1'));
			}


			/**
			* Decode a part of a mime-encoded string
			*
			* @access private
			*/
			private function _decode_mime_string_part($str)
			{
			$a = explode('?', $str);
			$count = count($a);

			// should be in format "charset?encoding?base64_string"
			if ($count >= 3)
			{
			for ($i=2; $i<$count; $i++)
			$rest.=$a[$i];

			if (($a[1]=="B")\|\|($a[1]=="b"))
			$rest = base64_decode($rest);
			else if (($a[1]=="Q")\|\|($a[1]=="q"))
			{
			$rest = str_replace("_", " ", $rest);
			$rest = quoted_printable_decode($rest);
			if ($folder == 'INBOX') {
			return true;
			}

			return rcube_charset_convert($rest, $a[0]);
			}
			else
			return $str; // we dont' know what to do with this
			}
			$key = $subscription ? 'subscribed' : 'existing';


			/**
			* Decode a mime part
			*
			* @param string Input string
			* @param string Part encoding
			* @return string Decoded string
			*/
			function mime_decode($input, $encoding='7bit')
			{
			switch (strtolower($encoding))
			{
			case 'quoted-printable':
			return quoted_printable_decode($input);
			break;

			case 'base64':
			return base64_decode($input);
			break;

			case 'x-uuencode':
			case 'x-uue':
			case 'uue':
			case 'uuencode':
			return convert_uudecode($input);
			break;

			case '7bit':
			default:
			return $input;
			}
			}


			/**
			* Convert body charset to RCMAIL_CHARSET according to the ctype_parameters
			*
			* @param string Part body to decode
			* @param string Charset to convert from
			* @return string Content converted to internal charset
			*/
			function charset_decode($body, $ctype_param)
			{
			if (is_array($ctype_param) && !empty($ctype_param['charset']))
			return rcube_charset_convert($body, $ctype_param['charset']);

			// defaults to what is specified in the class header
			return rcube_charset_convert($body, $this->default_charset);
			}


			/**
			* Translate UID to message ID
			*
			* @param int Message UID
			* @param string Mailbox name
			* @return int Message ID
			*/
			function get_id($uid, $mbox_name=NULL)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			return $this->_uid2id($uid, $mailbox);
			}


			/**
			* Translate message number to UID
			*
			* @param int Message ID
			* @param string Mailbox name
			* @return int Message UID
			*/
			function get_uid($id,$mbox_name=NULL)
			{
			$mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
			return $this->_id2uid($id, $mailbox);
			}


			/**
			* Modify folder name for input/output according to root dir and namespace
			*
			* @param string Folder name
			* @param string Mode
			* @return string Folder name
			*/
			function mod_mailbox($mbox_name, $mode='in')
			{
			if ((!empty($this->root_ns) && $this->root_ns == $mbox_name) \|\| $mbox_name == 'INBOX')
			return $mbox_name;

			if (!empty($this->root_dir)) {
			if ($mode=='in')
			$mbox_name = $this->root_dir.$this->delimiter.$mbox_name;
			else if (!empty($mbox_name)) // $mode=='out'
			$mbox_name = substr($mbox_name, strlen($this->root_dir)+1);
			}

			return $mbox_name;
			}


			/* --------------------------------
			* private methods
			* --------------------------------*/

			/**
			* Validate the given input and save to local properties
			* @access private
			*/
			private function _set_sort_order($sort_field, $sort_order)
			{
			if ($sort_field != null)
			$this->sort_field = asciiwords($sort_field);
			if ($sort_order != null)
			$this->sort_order = strtoupper($sort_order) == 'DESC' ? 'DESC' : 'ASC';
			}

			/**
			* Sort mailboxes first by default folders and then in alphabethical order
			* @access private
			*/
			private function _sort_mailbox_list($a_folders)
			{
			$a_out = $a_defaults = $folders = array();

			$delimiter = $this->get_hierarchy_delimiter();

			// find default folders and skip folders starting with '.'
			foreach ($a_folders as $i => $folder)
			{
			if ($folder{0}=='.')
			continue;

			if (($p = array_search($folder, $this->default_folders)) !== false && !$a_defaults[$p])
			$a_defaults[$p] = $folder;
			else
			$folders[$folder] = mb_strtolower(rcube_charset_convert($folder, 'UTF7-IMAP'));
			}

			// sort folders and place defaults on the top
			asort($folders, SORT_LOCALE_STRING);
			ksort($a_defaults);
			$folders = array_merge($a_defaults, array_keys($folders));

			// finally we must rebuild the list to move
			// subfolders of default folders to their place...
			// ...also do this for the rest of folders because
			// asort() is not properly sorting case sensitive names
			while (list($key, $folder) = each($folders)) {
			// set the type of folder name variable (#1485527)
			$a_out[] = (string) $folder;
			unset($folders[$key]);
			$this->_rsort($folder, $delimiter, $folders, $a_out);
			}

			return $a_out;
			}


			/**
			* @access private
			*/
			private function _rsort($folder, $delimiter, &$list, &$out)
			{
			while (list($key, $name) = each($list)) {
			if (strpos($name, $folder.$delimiter) === 0) {
			// set the type of folder name variable (#1485527)
			$out[] = (string) $name;
			unset($list[$key]);
			$this->_rsort($name, $delimiter, $list, $out);
			}
			}
			reset($list);
			}


			/**
			* @access private
			*/
			private function _uid2id($uid, $mbox_name=NULL)
			{
			if (!$mbox_name)
			$mbox_name = $this->mailbox;

			if (!isset($this->uid_id_map[$mbox_name][$uid]))
			$this->uid_id_map[$mbox_name][$uid] = iil_C_UID2ID($this->conn, $mbox_name, $uid);

			return $this->uid_id_map[$mbox_name][$uid];
			}

			/**
			* @access private
			*/
			private function _id2uid($id, $mbox_name=NULL)
			{
			if (!$mbox_name)
			$mbox_name = $this->mailbox;

			if ($uid = array_search($id, (array)$this->uid_id_map[$mbox_name]))
			return $uid;

			$uid = iil_C_ID2UID($this->conn, $mbox_name, $id);
			$this->uid_id_map[$mbox_name][$uid] = $id;

			return $uid;
			}


			/**
			* Subscribe/unsubscribe a list of mailboxes and update local cache
			* @access private
			*/
			private function _change_subscription($a_mboxes, $mode)
			{
			$updated = FALSE;

			if (is_array($a_mboxes))
			foreach ($a_mboxes as $i => $mbox_name)
			{
			$mailbox = $this->mod_mailbox($mbox_name);
			$a_mboxes[$i] = $mailbox;

			if ($mode=='subscribe')
			$updated = iil_C_Subscribe($this->conn, $mailbox);
			else if ($mode=='unsubscribe')
			$updated = iil_C_UnSubscribe($this->conn, $mailbox);
			if (is_array($this->icache[$key]) && in_array($folder, $this->icache[$key])) {
			return true;
			}

			// get cached mailbox list
			if ($updated)
			{
			$a_mailbox_cache = $this->get_cache('mailboxes');
			if (!is_array($a_mailbox_cache))
			if (!$this->check_connection()) {
			return false;
			}

			if ($subscription) {
			$a_folders = $this->conn->listSubscribed('', $folder);
			}
			else {
			$a_folders = $this->conn->listMailboxes('', $folder);
			}

			if (is_array($a_folders) && in_array($folder, $a_folders)) {
			$this->icache[$key][] = $folder;
			return true;
			}

			return false;
			}


			/**
			* Returns the namespace where the folder is in
			*
			* @param string $folder Folder name
			*
			* @return string One of 'personal', 'other' or 'shared'
			*/
			public function folder_namespace($folder)
			{
			if ($folder == 'INBOX') {
			return 'personal';
			}

			foreach ($this->namespace as $type => $namespace) {
			if (is_array($namespace)) {
			foreach ($namespace as $ns) {
			if ($len = strlen($ns[0])) {
			if (($len > 1 && $folder == substr($ns[0], 0, -1))
			\|\| strpos($folder, $ns[0]) === 0
			) {
			return $type;
			}
			}
			}
			}
			}

			return 'personal';
			}


			/**
			* Modify folder name according to namespace.
			* For output it removes prefix of the personal namespace if it's possible.
			* For input it adds the prefix. Use it before creating a folder in root
			* of the folders tree.
			*
			* @param string $folder Folder name
			* @param string $mode Mode name (out/in)
			*
			* @return string Folder name
			*/
			public function mod_folder($folder, $mode = 'out')
			{
			if (!strlen($folder)) {
			return $folder;
			}

			$prefix = $this->namespace['prefix']; // see set_env()
			$prefix_len = strlen($prefix);

			if (!$prefix_len) {
			return $folder;
			}

			// remove prefix for output
			if ($mode == 'out') {
			if (substr($folder, 0, $prefix_len) === $prefix) {
			return substr($folder, $prefix_len);
			}
			}
			// add prefix for input (e.g. folder creation)
			else {
			return $prefix . $folder;
			}

			return $folder;
			}


			/**
			* Gets folder attributes from LIST response, e.g. \Noselect, \Noinferiors
			*
			* @param string $folder Folder name
			* @param bool $force Set to True if attributes should be refreshed
			*
			* @return array Options list
			*/
			public function folder_attributes($folder, $force=false)
			{
			// get attributes directly from LIST command
			if (!empty($this->conn->data['LIST']) && is_array($this->conn->data['LIST'][$folder])) {
			$opts = $this->conn->data['LIST'][$folder];
			}
			// get cached folder attributes
			else if (!$force) {
			$opts = $this->get_cache('mailboxes.attributes');
			$opts = $opts[$folder];
			}

			if (!is_array($opts)) {
			if (!$this->check_connection()) {
			return array();
			}

			$this->conn->listMailboxes('', $folder);
			$opts = $this->conn->data['LIST'][$folder];
			}

			return is_array($opts) ? $opts : array();
			}


			/**
			* Gets connection (and current folder) data: UIDVALIDITY, EXISTS, RECENT,
			* PERMANENTFLAGS, UIDNEXT, UNSEEN
			*
			* @param string $folder Folder name
			*
			* @return array Data
			*/
			public function folder_data($folder)
			{
			if (!strlen($folder)) {
			$folder = $this->folder !== null ? $this->folder : 'INBOX';
			}

			if ($this->conn->selected != $folder) {
			if (!$this->check_connection()) {
			return array();
			}

			if ($this->conn->select($folder)) {
			$this->folder = $folder;
			}
			else {
			return null;
			}
			}

			$data = $this->conn->data;

			// add (E)SEARCH result for ALL UNDELETED query
			if (!empty($this->icache['undeleted_idx'])
			&& $this->icache['undeleted_idx']->get_parameters('MAILBOX') == $folder
			) {
			$data['UNDELETED'] = $this->icache['undeleted_idx'];
			}

			return $data;
			}


			/**
			* Returns extended information about the folder
			*
			* @param string $folder Folder name
			*
			* @return array Data
			*/
			public function folder_info($folder)
			{
			if ($this->icache['options'] && $this->icache['options']['name'] == $folder) {
			return $this->icache['options'];
			}

			$acl = $this->get_capability('ACL');
			$namespace = $this->get_namespace();
			$options = array();

			// check if the folder is a namespace prefix
			if (!empty($namespace)) {
			$mbox = $folder . $this->delimiter;
			foreach ($namespace as $ns) {
			if (!empty($ns)) {
			foreach ($ns as $item) {
			if ($item[0] === $mbox) {
			$options['is_root'] = true;
			break 2;
			}
			}
			}
			}
			}
			// check if the folder is other user virtual-root
			if (!$options['is_root'] && !empty($namespace) && !empty($namespace['other'])) {
			$parts = explode($this->delimiter, $folder);
			if (count($parts) == 2) {
			$mbox = $parts[0] . $this->delimiter;
			foreach ($namespace['other'] as $item) {
			if ($item[0] === $mbox) {
			$options['is_root'] = true;
			break;
			}
			}
			}
			}

			$options['name'] = $folder;
			$options['attributes'] = $this->folder_attributes($folder, true);
			$options['namespace'] = $this->folder_namespace($folder);
			$options['rights'] = $acl && !$options['is_root'] ? (array)$this->my_rights($folder) : array();
			$options['special'] = in_array($folder, $this->default_folders);

			// Set 'noselect' and 'norename' flags
			if (is_array($options['attributes'])) {
			foreach ($options['attributes'] as $attrib) {
			$attrib = strtolower($attrib);
			if ($attrib == '\noselect' \|\| $attrib == '\nonexistent') {
			$options['noselect'] = true;
			}
			}
			}
			else {
			$options['noselect'] = true;
			}

			if (!empty($options['rights'])) {
			$options['norename'] = !in_array('x', $options['rights']) && !in_array('d', $options['rights']);

			if (!$options['noselect']) {
			$options['noselect'] = !in_array('r', $options['rights']);
			}
			}
			else {
			$options['norename'] = $options['is_root'] \|\| $options['namespace'] != 'personal';
			}

			$this->icache['options'] = $options;

			return $options;
			}


			/**
			* Synchronizes messages cache.
			*
			* @param string $folder Folder name
			*/
			public function folder_sync($folder)
			{
			if ($mcache = $this->get_mcache_engine()) {
			$mcache->synchronize($folder);
			}
			}


			/**
			* Get message header names for rcube_imap_generic::fetchHeader(s)
			*
			* @return string Space-separated list of header names
			*/
			protected function get_fetch_headers()
			{
			if (!empty($this->options['fetch_headers'])) {
			$headers = explode(' ', $this->options['fetch_headers']);
			$headers = array_map('strtoupper', $headers);
			}
			else {
			$headers = array();
			}

			if ($this->messages_caching \|\| $this->options['all_headers']) {
			$headers = array_merge($headers, $this->all_headers);
			}

			return implode(' ', array_unique($headers));
			}


			/* -----------------------------------------
			* ACL and METADATA/ANNOTATEMORE methods
			* ----------------------------------------*/

			/**
			* Changes the ACL on the specified folder (SETACL)
			*
			* @param string $folder Folder name
			* @param string $user User name
			* @param string $acl ACL string
			*
			* @return boolean True on success, False on failure
			* @since 0.5-beta
			*/
			public function set_acl($folder, $user, $acl)
			{
			if (!$this->get_capability('ACL')) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			return $this->conn->setACL($folder, $user, $acl);
			}


			/**
			* Removes any <identifier,rights> pair for the
			* specified user from the ACL for the specified
			* folder (DELETEACL)
			*
			* @param string $folder Folder name
			* @param string $user User name
			*
			* @return boolean True on success, False on failure
			* @since 0.5-beta
			*/
			public function delete_acl($folder, $user)
			{
			if (!$this->get_capability('ACL')) {
			return false;
			}

			if (!$this->check_connection()) {
			return false;
			}

			return $this->conn->deleteACL($folder, $user);
			}


			/**
			* Returns the access control list for folder (GETACL)
			*
			* @param string $folder Folder name
			*
			* @return array User-rights array on success, NULL on error
			* @since 0.5-beta
			*/
			public function get_acl($folder)
			{
			if (!$this->get_capability('ACL')) {
			return null;
			}

			if (!$this->check_connection()) {
			return null;
			}

			return $this->conn->getACL($folder);
			}


			/**
			* Returns information about what rights can be granted to the
			* user (identifier) in the ACL for the folder (LISTRIGHTS)
			*
			* @param string $folder Folder name
			* @param string $user User name
			*
			* @return array List of user rights
			* @since 0.5-beta
			*/
			public function list_rights($folder, $user)
			{
			if (!$this->get_capability('ACL')) {
			return null;
			}

			if (!$this->check_connection()) {
			return null;
			}

			return $this->conn->listRights($folder, $user);
			}


			/**
			* Returns the set of rights that the current user has to
			* folder (MYRIGHTS)
			*
			* @param string $folder Folder name
			*
			* @return array MYRIGHTS response on success, NULL on error
			* @since 0.5-beta
			*/
			public function my_rights($folder)
			{
			if (!$this->get_capability('ACL')) {
			return null;
			}

			if (!$this->check_connection()) {
			return null;
			}

			return $this->conn->myRights($folder);
			}


			/**
			* Sets IMAP metadata/annotations (SETMETADATA/SETANNOTATION)
			*
			* @param string $folder Folder name (empty for server metadata)
			* @param array $entries Entry-value array (use NULL value as NIL)
			*
			* @return boolean True on success, False on failure
			* @since 0.5-beta
			*/
			public function set_metadata($folder, $entries)
			{
			if (!$this->check_connection()) {
			return false;
			}

			if ($this->get_capability('METADATA') \|\|
			(!strlen($folder) && $this->get_capability('METADATA-SERVER'))
			) {
			return $this->conn->setMetadata($folder, $entries);
			}
			else if ($this->get_capability('ANNOTATEMORE') \|\| $this->get_capability('ANNOTATEMORE2')) {
			foreach ((array)$entries as $entry => $value) {
			list($ent, $attr) = $this->md2annotate($entry);
			$entries[$entry] = array($ent, $attr, $value);
			}
			return $this->conn->setAnnotation($folder, $entries);
			}

			return false;
			}


			/**
			* Unsets IMAP metadata/annotations (SETMETADATA/SETANNOTATION)
			*
			* @param string $folder Folder name (empty for server metadata)
			* @param array $entries Entry names array
			*
			* @return boolean True on success, False on failure
			* @since 0.5-beta
			*/
			public function delete_metadata($folder, $entries)
			{
			if (!$this->check_connection()) {
			return false;
			}

			if ($this->get_capability('METADATA') \|\|
			(!strlen($folder) && $this->get_capability('METADATA-SERVER'))
			) {
			return $this->conn->deleteMetadata($folder, $entries);
			}
			else if ($this->get_capability('ANNOTATEMORE') \|\| $this->get_capability('ANNOTATEMORE2')) {
			foreach ((array)$entries as $idx => $entry) {
			list($ent, $attr) = $this->md2annotate($entry);
			$entries[$idx] = array($ent, $attr, NULL);
			}
			return $this->conn->setAnnotation($folder, $entries);
			}

			return false;
			}


			/**
			* Returns IMAP metadata/annotations (GETMETADATA/GETANNOTATION)
			*
			* @param string $folder Folder name (empty for server metadata)
			* @param array $entries Entries
			* @param array $options Command options (with MAXSIZE and DEPTH keys)
			*
			* @return array Metadata entry-value hash array on success, NULL on error
			* @since 0.5-beta
			*/
			public function get_metadata($folder, $entries, $options=array())
			{
			if (!$this->check_connection()) {
			return null;
			}

			if ($this->get_capability('METADATA') \|\|
			(!strlen($folder) && $this->get_capability('METADATA-SERVER'))
			) {
			return $this->conn->getMetadata($folder, $entries, $options);
			}
			else if ($this->get_capability('ANNOTATEMORE') \|\| $this->get_capability('ANNOTATEMORE2')) {
			$queries = array();
			$res = array();

			// Convert entry names
			foreach ((array)$entries as $entry) {
			list($ent, $attr) = $this->md2annotate($entry);
			$queries[$attr][] = $ent;
			}

			// @TODO: Honor MAXSIZE and DEPTH options
			foreach ($queries as $attrib => $entry) {
			if ($result = $this->conn->getAnnotation($folder, $entry, $attrib)) {
			$res = array_merge_recursive($res, $result);
			}
			}

			return $res;
			}

			return null;
			}


			/**
			* Converts the METADATA extension entry name into the correct
			* entry-attrib names for older ANNOTATEMORE version.
			*
			* @param string $entry Entry name
			*
			* @return array Entry-attribute list, NULL if not supported (?)
			*/
			protected function md2annotate($entry)
			{
			if (substr($entry, 0, 7) == '/shared') {
			return array(substr($entry, 7), 'value.shared');
			}
			else if (substr($entry, 0, 8) == '/private') {
			return array(substr($entry, 8), 'value.priv');
			}

			// @TODO: log error
			return null;
			}


			/* --------------------------------
			* internal caching methods
			* --------------------------------*/

			/**
			* Enable or disable indexes caching
			*
			* @param string $type Cache type (@see rcmail::get_cache)
			*/
			public function set_caching($type)
			{
			if ($type) {
			$this->caching = $type;
			}
			else {
			if ($this->cache) {
			$this->cache->close();
			}
			$this->cache = null;
			$this->caching = false;
			}
			}

			/**
			* Getter for IMAP cache object
			*/
			protected function get_cache_engine()
			{
			if ($this->caching && !$this->cache) {
			$rcmail = rcmail::get_instance();
			$ttl = $rcmail->config->get('message_cache_lifetime', '10d');
			$ttl = get_offset_time($ttl) - time();
			$this->cache = $rcmail->get_cache('IMAP', $this->caching, $ttl);
			}

			return $this->cache;
			}

			/**
			* Returns cached value
			*
			* @param string $key Cache key
			*
			* @return mixed
			*/
			public function get_cache($key)
			{
			if ($cache = $this->get_cache_engine()) {
			return $cache->get($key);
			}
			}

			/**
			* Update cache
			*
			* @param string $key Cache key
			* @param mixed $data Data
			*/
			public function update_cache($key, $data)
			{
			if ($cache = $this->get_cache_engine()) {
			$cache->set($key, $data);
			}
			}

			/**
			* Clears the cache.
			*
			* @param string $key Cache key name or pattern
			* @param boolean $prefix_mode Enable it to clear all keys starting
			* with prefix specified in $key
			*/
			public function clear_cache($key = null, $prefix_mode = false)
			{
			if ($cache = $this->get_cache_engine()) {
			$cache->remove($key, $prefix_mode);
			}
			}

			/**
			* Delete outdated cache entries
			*/
			public function expunge_cache()
			{
			if ($this->mcache) {
			$ttl = rcmail::get_instance()->config->get('message_cache_lifetime', '10d');
			$this->mcache->expunge($ttl);
			}

			if ($this->cache)
			$this->cache->expunge();
			}


			/* --------------------------------
			* message caching methods
			* --------------------------------*/

			/**
			* Enable or disable messages caching
			*
			* @param boolean $set Flag
			*/
			public function set_messages_caching($set)
			{
			if ($set) {
			$this->messages_caching = true;
			}
			else {
			if ($this->mcache) {
			$this->mcache->close();
			}
			$this->mcache = null;
			$this->messages_caching = false;
			}
			}


			/**
			* Getter for messages cache object
			*/
			protected function get_mcache_engine()
			{
			if ($this->messages_caching && !$this->mcache) {
			$rcmail = rcmail::get_instance();
			if ($dbh = $rcmail->get_dbh()) {
			$this->mcache = new rcube_imap_cache(
			$dbh, $this, $rcmail->user->ID, $this->options['skip_deleted']);
			}
			}

			return $this->mcache;
			}


			/**
			* Clears the messages cache.
			*
			* @param string $folder Folder name
			* @param array $uids Optional message UIDs to remove from cache
			*/
			protected function clear_message_cache($folder = null, $uids = null)
			{
			if ($mcache = $this->get_mcache_engine()) {
			$mcache->clear($folder, $uids);
			}
			}


			/* --------------------------------
			* protected methods
			* --------------------------------*/

			/**
			* Validate the given input and save to local properties
			*
			* @param string $sort_field Sort column
			* @param string $sort_order Sort order
			*/
			protected function set_sort_order($sort_field, $sort_order)
			{
			if ($sort_field != null) {
			$this->sort_field = asciiwords($sort_field);
			}
			if ($sort_order != null) {
			$this->sort_order = strtoupper($sort_order) == 'DESC' ? 'DESC' : 'ASC';
			}
			}


			/**
			* Sort folders first by default folders and then in alphabethical order
			*
			* @param array $a_folders Folders list
			*/
			protected function sort_folder_list($a_folders)
			{
			$a_out = $a_defaults = $folders = array();

			$delimiter = $this->get_hierarchy_delimiter();

			// find default folders and skip folders starting with '.'
			foreach ($a_folders as $i => $folder) {
			if ($folder[0] == '.') {
			continue;
			}

			if (($p = array_search($folder, $this->default_folders)) !== false && !$a_defaults[$p]) {
			$a_defaults[$p] = $folder;
			}
			else {
			$folders[$folder] = rcube_charset_convert($folder, 'UTF7-IMAP');
			}
			}

			// sort folders and place defaults on the top
			asort($folders, SORT_LOCALE_STRING);
			ksort($a_defaults);
			$folders = array_merge($a_defaults, array_keys($folders));

			// finally we must rebuild the list to move
			// subfolders of default folders to their place...
			// ...also do this for the rest of folders because
			// asort() is not properly sorting case sensitive names
			while (list($key, $folder) = each($folders)) {
			// set the type of folder name variable (#1485527)
			$a_out[] = (string) $folder;
			unset($folders[$key]);
			$this->rsort($folder, $delimiter, $folders, $a_out);
			}

			return $a_out;
			}


			/**
			* Recursive method for sorting folders
			*/
			protected function rsort($folder, $delimiter, &$list, &$out)
			{
			while (list($key, $name) = each($list)) {
			if (strpos($name, $folder.$delimiter) === 0) {
			// set the type of folder name variable (#1485527)
			$out[] = (string) $name;
			unset($list[$key]);
			$this->rsort($name, $delimiter, $list, $out);
			}
			}
			reset($list);
			}


			/**
			* Find UID of the specified message sequence ID
			*
			* @param int $id Message (sequence) ID
			* @param string $folder Folder name
			*
			* @return int Message UID
			*/
			public function id2uid($id, $folder = null)
			{
			if (!strlen($folder)) {
			$folder = $this->folder;
			}

			if ($uid = array_search($id, (array)$this->uid_id_map[$folder])) {
			return $uid;
			}

			if (!$this->check_connection()) {
			return null;
			}

			$uid = $this->conn->ID2UID($folder, $id);

			$this->uid_id_map[$folder][$uid] = $id;

			return $uid;
			}


			/**
			* Subscribe/unsubscribe a list of folders and update local cache
			*/
			protected function change_subscription($folders, $mode)
			{
			$updated = false;

			if (!empty($folders)) {
			if (!$this->check_connection()) {
			return false;
			}

			foreach ((array)$folders as $i => $folder) {
			$folders[$i] = $folder;

			if ($mode == 'subscribe') {
			$updated = $this->conn->subscribe($folder);
			}
			else if ($mode == 'unsubscribe') {
			$updated = $this->conn->unsubscribe($folder);
			}
			}
			}

			// clear cached folders list(s)
			if ($updated) {
			$this->clear_cache('mailboxes', true);
			}

			return $updated;

			// modify cached list
			if ($mode=='subscribe')
			$a_mailbox_cache = array_merge($a_mailbox_cache, $a_mboxes);
			else if ($mode=='unsubscribe')
			$a_mailbox_cache = array_diff($a_mailbox_cache, $a_mboxes);

			// write mailboxlist to cache
			$this->update_cache('mailboxes', $this->_sort_mailbox_list($a_mailbox_cache));
			}

			return $updated;
			}


			/**
			* Increde/decrese messagecount for a specific mailbox
			* @access private
			*/
			private function _set_messagecount($mbox_name, $mode, $increment)
			/**
			* Increde/decrese messagecount for a specific folder
			*/
			protected function set_messagecount($folder, $mode, $increment)
			{
			$a_mailbox_cache = FALSE;
			$mailbox = $mbox_name ? $mbox_name : $this->mailbox;
			$mode = strtoupper($mode);

			$a_mailbox_cache = $this->get_cache('messagecount');

			if (!is_array($a_mailbox_cache[$mailbox]) \|\| !isset($a_mailbox_cache[$mailbox][$mode]) \|\| !is_numeric($increment))
			return FALSE;

			// add incremental value to messagecount
			$a_mailbox_cache[$mailbox][$mode] += $increment;

			// there's something wrong, delete from cache
			if ($a_mailbox_cache[$mailbox][$mode] < 0)
			unset($a_mailbox_cache[$mailbox][$mode]);

			// write back to cache
			$this->update_cache('messagecount', $a_mailbox_cache);

			return TRUE;
			}


			/**
			* Remove messagecount of a specific mailbox from cache
			* @access private
			*/
			private function _clear_messagecount($mbox_name='')
			{
			$a_mailbox_cache = FALSE;
			$mailbox = $mbox_name ? $mbox_name : $this->mailbox;

			$a_mailbox_cache = $this->get_cache('messagecount');

			if (is_array($a_mailbox_cache[$mailbox]))
			{
			unset($a_mailbox_cache[$mailbox]);
			$this->update_cache('messagecount', $a_mailbox_cache);
			}
			}


			/**
			* Split RFC822 header string into an associative array
			* @access private
			*/
			private function _parse_headers($headers)
			{
			$a_headers = array();
			$headers = preg_replace('/\r?\n(\t\| )+/', ' ', $headers);
			$lines = explode("\n", $headers);
			$c = count($lines);
			for ($i=0; $i<$c; $i++)
			{
			if ($p = strpos($lines[$i], ': '))
			{
			$field = strtolower(substr($lines[$i], 0, $p));
			$value = trim(substr($lines[$i], $p+1));
			if (!empty($value))
			$a_headers[$field] = $value;
			if (!is_numeric($increment)) {
			return false;
			}
			}

			return $a_headers;
			}

			$mode = strtoupper($mode);
			$a_folder_cache = $this->get_cache('messagecount');

			/**
			* @access private
			*/
			private function _parse_address_list($str, $decode=true)
			{
			// remove any newlines and carriage returns before
			$a = rcube_explode_quoted_string('[,;]', preg_replace( "/[\r\n]/", " ", $str));
			$result = array();

			foreach ($a as $key => $val)
			{
			$val = preg_replace("/([\"\w])</", "$1 <", $val);
			$sub_a = rcube_explode_quoted_string(' ', $decode ? $this->decode_header($val) : $val);
			$result[$key]['name'] = '';

			foreach ($sub_a as $k => $v)
			{
			// use angle brackets in regexp to not handle names with @ sign
			if (preg_match('/^<\S+@\S+>$/', $v))
			$result[$key]['address'] = trim($v, '<>');
			else
			$result[$key]['name'] .= (empty($result[$key]['name'])?'':' ').str_replace("\"",'',stripslashes($v));
			if (!is_array($a_folder_cache[$folder]) \|\| !isset($a_folder_cache[$folder][$mode])) {
			return false;
			}

			if (empty($result[$key]['name']))
			$result[$key]['name'] = $result[$key]['address'];
			elseif (empty($result[$key]['address']))
			$result[$key]['address'] = $result[$key]['name'];
			}

			return $result;

			// add incremental value to messagecount
			$a_folder_cache[$folder][$mode] += $increment;

			// there's something wrong, delete from cache
			if ($a_folder_cache[$folder][$mode] < 0) {
			unset($a_folder_cache[$folder][$mode]);
			}

			// write back to cache
			$this->update_cache('messagecount', $a_folder_cache);

			return true;
			}

			} // end class rcube_imap

			/**
			* Remove messagecount of a specific folder from cache
			*/
			protected function clear_messagecount($folder, $mode=null)
			{
			$a_folder_cache = $this->get_cache('messagecount');

			if (is_array($a_folder_cache[$folder])) {
			if ($mode) {
			unset($a_folder_cache[$folder][$mode]);
			}
			else {
			unset($a_folder_cache[$folder]);
			}
			$this->update_cache('messagecount', $a_folder_cache);
			}
			}


			/**
			* Class representing a message part
			*
			* @package Mail
			*/
			class rcube_message_part
			{
			var $mime_id = '';
			var $ctype_primary = 'text';
			var $ctype_secondary = 'plain';
			var $mimetype = 'text/plain';
			var $disposition = '';
			var $filename = '';
			var $encoding = '8bit';
			var $charset = '';
			var $size = 0;
			var $headers = array();
			var $d_parameters = array();
			var $ctype_parameters = array();

			function __clone()
			{
			if (isset($this->parts))
			foreach ($this->parts as $idx => $part)
			if (is_object($part))
			$this->parts[$idx] = clone $part;
			}
			}
			/**
			* This is our own debug handler for the IMAP connection
			* @access public
			*/
			public function debug_handler(&$imap, $message)
			{
			write_log('imap', $message);
			}


			/**
			* Class for sorting an array of iilBasicHeader objects in a predetermined order.
			*
			* @package Mail
			* @author Eric Stadtherr
			*/
			class rcube_header_sorter
			{
			var $sequence_numbers = array();

			/**
			* Set the predetermined sort order.
			*
			* @param array Numerically indexed array of IMAP message sequence numbers
			*/
			function set_sequence_numbers($seqnums)
			{
			$this->sequence_numbers = array_flip($seqnums);
			}

			/**
			* Sort the array of header objects
			*
			* @param array Array of iilBasicHeader objects indexed by UID
			*/
			function sort_headers(&$headers)
			{
			/*
			* uksort would work if the keys were the sequence number, but unfortunately
			* the keys are the UIDs. We'll use uasort instead and dereference the value
			* to get the sequence number (in the "id" field).
			*
			* uksort($headers, array($this, "compare_seqnums"));
			*/
			uasort($headers, array($this, "compare_seqnums"));
			}

			/**
			* Sort method called by uasort()
			*/
			function compare_seqnums($a, $b)
			{
			// First get the sequence number from the header object (the 'id' field).
			$seqa = $a->id;
			$seqb = $b->id;

			// then find each sequence number in my ordered list
			$posa = isset($this->sequence_numbers[$seqa]) ? intval($this->sequence_numbers[$seqa]) : -1;
			$posb = isset($this->sequence_numbers[$seqb]) ? intval($this->sequence_numbers[$seqb]) : -1;

			// return the relative position as the comparison value
			return $posa - $posb;
			}
			/**
			* Deprecated methods (to be removed)
			*/

			public function decode_address_list($input, $max = null, $decode = true, $fallback = null)
			{
			return rcube_mime::decode_address_list($input, $max, $decode, $fallback);
			}

			public function decode_header($input, $fallback = null)
			{
			return rcube_mime::decode_mime_string((string)$input, $fallback);
			}

			public static function decode_mime_string($input, $fallback = null)
			{
			return rcube_mime::decode_mime_string($input, $fallback);
			}

			public function mime_decode($input, $encoding = '7bit')
			{
			return rcube_mime::decode($input, $encoding);
			}

			public static function explode_header_string($separator, $str, $remove_comments = false)
			{
			return rcube_mime::explode_header_string($separator, $str, $remove_comments);
			}

			public function select_mailbox($mailbox)
			{
			// do nothing
			}

			public function set_mailbox($folder)
			{
			$this->set_folder($folder);
			}

			public function get_mailbox_name()
			{
			return $this->get_folder();
			}

			public function list_headers($folder='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
			{
			return $this->list_messages($folder, $page, $sort_field, $sort_order, $slice);
			}

			public function mailbox_status($folder = null)
			{
			return $this->folder_status($folder);
			}

			public function message_index($folder = '', $sort_field = NULL, $sort_order = NULL)
			{
			return $this->index($folder, $sort_field, $sort_order);
			}

			public function message_index_direct($folder, $sort_field = null, $sort_order = null, $skip_cache = true)
			{
			return $this->index_direct($folder, $sort_field, $sort_order, $skip_cache);
			}

			public function list_mailboxes($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
			{
			return $this->list_folders_subscribed($root, $name, $filter, $rights, $skip_sort);
			}

			public function list_unsubscribed($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
			{
			return $this->list_folders($root, $name, $filter, $rights, $skip_sort);
			}

			public function get_mailbox_size($folder)
			{
			return $this->folder_size($folder);
			}

			public function create_mailbox($folder, $subscribe=false)
			{
			return $this->create_folder($folder, $subscribe);
			}

			public function rename_mailbox($folder, $new_name)
			{
			return $this->rename_folder($folder, $new_name);
			}

			function delete_mailbox($folder)
			{
			return $this->delete_folder($folder);
			}

			public function mailbox_exists($folder, $subscription=false)
			{
			return $this->folder_exists($folder, $subscription);
			}

			public function mailbox_namespace($folder)
			{
			return $this->folder_namespace($folder);
			}

			public function mod_mailbox($folder, $mode = 'out')
			{
			return $this->mod_folder($folder, $mode);
			}

			public function mailbox_attributes($folder, $force=false)
			{
			return $this->folder_attributes($folder, $force);
			}

			public function mailbox_data($folder)
			{
			return $this->folder_data($folder);
			}

			public function mailbox_info($folder)
			{
			return $this->folder_info($folder);
			}

			public function mailbox_sync($folder)
			{
			return $this->folder_sync($folder);
			}

			public function expunge($folder='', $clear_cache=true)
			{
			return $this->expunge_folder($folder, $clear_cache);
			}

			}