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	diff --git a/CHANGELOG b/CHANGELOG
	index 062313ee1..baca86765 100644
	--- a/CHANGELOG
	+++ b/CHANGELOG
	@@ -1,1552 +1,1553 @@
	CHANGELOG Roundcube Webmail
	===========================

	+- Support IMAP MOVE extension [RFC 6851]
	- Fix javascript errors when working in a page opened with taget="_blank"
	- Mention SQLite database format change in UPGRADING file (#1488983)
	- Increase maxlength to 254 chars for email input fields in addressbook (#1488987)
	- Add attachment menu with Open and Download options (#1488975)
	- Fix thumbnail size when GD extension is used for image resize (#1488985)
	- Display user-friendly message on IMAP "over quota" errors (#1484164)
	- Display notice that message is encrypted also for application/pkcs7-mime messages (#1488526)
	- Extended archive plugin with user-configurable options to store messages into subfolders
	- Fix export of selected contacts from search result (#1488905)
	- Feature to export only selected contacts from addressbook (by Phil Weir)

	RELEASE 0.9-rc
	--------------
	- Fix plain text spellchecker incorrect highlighting in non-ASCII text (#1488973)
	- Add workaround for invalid message charset detection by IMAP servers (#1488968)
	- Fix NUL characters in content-type of ms-tnef attachment (#1488964)
	- Fix regression in handling LDAP contact identifiers (#1488959)
	- Updated translations from Transifex
	- Fix buggy error template in a frame (#1488938)
	- Add addressbook widget on compose page in classic skin
	- Add search box to compose address book widget (#1488381)
	- Fix login in case when default_host is an array with one element (#1488928)
	- Use LDAP fallback hosts on connect + bind instead of ldap_connect() only.
	- Add config option for LDAP bind timeout (sets LDAP_OPT_NETWORK_TIMEOUT option)
	- Submit Addressbook advanced search form with Enter key (#1488568)
	- Also block remote images in HTML part view (#1488827)
	- Improved database schema upgrade procedure, added updatedb.sh script
	- Force autocommit mode in mysql database driver (#1488902)

	RELEASE 0.9-beta
	----------------
	- Fix searching by date in address book (#1488888)
	- Improve charset detection by prioritizing charset according to user language (#1485669)
	- Fix handling of escaped separator in vCard file (#1488896)
	- Add option to use envelope From address for MDN responses (#1488880)
	- Add possibility to search in message body only (#1488770)
	- Support "multipart/relative" as an alias for "multipart/related" type (#1488886)
	- Display PGP/MIME signature attachments as "Digital Signature" (#1488570)
	- Workaround UW-IMAP bug where hierarchy separator is added to the shared folder name (#1488879)
	- Fix version comparisons with -stable suffix (#1488876)
	- Add unsupported alternative parts to attachments list (#1488870)
	- Add Compose button on message view page (#1488747)
	- Display 'Sender' header in message preview
	- Plugin API: Added message_before_send hook
	- Fix contact copy/add-to-group operations on search result (#1488862)
	- Use matching identity in MDN response (#1488864)
	- Fix handling of signatures on draft edit (#1488798)
	- Fix so compacting of non-empty folder is possible also when messages list is empty (#1488858)
	- Allow forwarding of multiple emails (#1486854)
	- Fix big memory consumption of DB layer (#1488856)
	- Fix broken message/part bodies when FETCH response contains more untagged lines (#1488836)
	- Fix empty email on identities list after identity update (#1488834)
	- Add new identities_level: (4) one identity with possibility to edit only signature
	- Use Delivered-To and Envelope-To headers for identity selection (#1488840, #1488553)
	- Fix XSS vulnerability using Flash files (#1488828)
	- Always save drafts with format=flowed in order to keep original line wraps (#1488799)
	- Select default_addressbook on the list in Address Book (#1488280)
	- Fix so mobile phone has TYPE=CELL in exported vCard (#1488812)
	- Support contacts import from CSV file (#1486399)
	- Improved keep-alive action. Now the interval is based on session_lifetime (#1488507)
	- Added cross-task 'refresh' request for system state updates (#1488507)
	- Renamed config options: keep_alive to refresh_interval, min_keep_alive to min_refresh_interval
	- Fix handling of text/enriched content on message reply/forward/edit
	- Option to display attached images as thumbnails below message body
	- Upgraded to jQuery 1.8.3 and jQuery UI 1.9.1
	- Add config option to automatically generate LDAP attributes for new entries
	- Add user settings to open message view and compose form in new windows (#1485486)
	- Better client-side timezone detection using the jsTimezoneDetect library (#1488725)
	- Add option to disable saving sent mail in Sent folder - no_save_sent_messages (#1488686)
	- Fix handling dont_override with message_sort_col and message_sort_order settings (#1488760)
	- Fix handling of URLs with asterisk characters (#1488759)
	- Remove automatic to-lowercase conversion of usernames (#1488715)
	- Plugin API: Add 'email_list' argument for identities data in user_create hook
	- Integrated zipdownload plugin to download all attachments (#1445509)
	- Fix HTML special characters handling in message list/header display (#1488523)
	- List related text/html part as attachment in plain text mode (#1488677)
	- Use IMAP BINARY (RFC3516) extension to fetch message/part bodies
	- Fix folder creation under public namespace root (#1488665)
	- Fix so "Edit as new" on draft creates a new message (#1488687)
	- Fix invalid error message on deleting mail from read only folder (#1488694)
	- Replace data URIs of images (pasted in HTML editor) with inline attachments (#1488502)
	- Remove (too big) min-width on mail screen
	- Added template object 'frame'
	- Add option to enable HTML editor on forwarding (#1488517)
	- Add option to not include original message on reply, rename option top_posting to reply_mode (#1485149)
	- Added session_path config option and unified cookies settings in javascript
	- Added "Undeleted" option to messages list filter
	- Rewritten test scripts for PHPUnit
	- Add new DB abstraction layer based on PHP PDO, supporting SQLite3 (#1488332)
	- Removed PEAR::MDB2 package
	- Removed users.alias column, added option ('user_aliases')
	to use email address from identities as username (#1488581)
	- Removed redundant cache.cache_id column (#1488528)
	- Fix order of attachments in sent mail (#1488423)
	- Fix Shift + delete button does not permanently delete messages (#1488243)
	- Add Content-Length for attachments where possible (#1485478)
	- Fix attachment sizes in message print page and attachment preview page (#1488515)
	- Add mail attachments using drag & drop on HTML5 enabled browsers
	- Add workaround for invalid BODYSTRUCTURE response - parse message with Mail_mimeDecode package (#1485585)
	- Display Tiff as Jpeg in browsers without Tiff support (#1488452)
	- Don't display Pdf/Tiff/Flash attachments inline without browser support (#1488452, #1487929)
	- Add is_escaped attribute for html_select and html_textarea (#1488485)
	- Fix issue where draft auto-save wasn't executed after some inactivity time
	- Add vCard import from multiple files at once (#1488015)
	- Roundcube Framework:
	Add possibility to replace IMAP driver with custom class
	Add IMAP auto-connection feature, improving performance with caching enabled
	Replace imap_init hook with storage_init (with additional 'driver' argument)
	Improved performance by caching IMAP server's capabilities in session
	Unified global functions naming (rcube_ prefix)
	Better classes separation
	Framework files moved to lib/Roundcube

	RELEASE 0.8.5
	-------------
	- Fix #countcontrols issue in IE<=8 when text is very long (#1488890)
	- Fix unwanted horizontal scrollbar in message preview header (#1488866)
	- Add workaround for IE<=8 bug where Content-Disposition:inline was ignored (#1488844)
	- Fix XSS vulnerability in vbscript: and data:text links handling (#1488850)
	- Fix absolute positioning in HTML messages (#1488819)
	- Fix cache (in)validation after setting \Deleted flag
	- Fix keybord events on messages list in opera browser (#1488823)
	- Fix selection of collapsed thread rows (#1488772)
	- Fix wrapping of quoted text with format=flowed (#1488177)

	RELEASE 0.8.4
	-------------
	- Fix regression where unintentional page reload was done after request abort (#1488802)
	- Fix XSS vulnerability in handling of text/enriched messages (#1488806)
	- Fix handling of 'media' attribute on linked css (#1488789)
	- Fix excessive LFs at the end of composed message with top_posting=true (#1488797)
	- Fix bug where leading blanks were stripped from quoted lines (#1488795)

	RELEASE 0.8.3
	-------------
	- Fix AREA links handling (#1488792)
	- Fix possible HTTP DoS on error in keep-alive requests (#1488782)
	- Fix compatybility with MDB2 2.5.0b4 (#1488779)
	- Fix a bug where saving a message in INBOX wasn't possible
	- Fix HTML part detection in messages with attachments (#1488769)
	- Fix bug where wrong words were highlighted on spell-before-send check
	- Fix scrolling quirk in email preview frame using Opera 12 (#1488763)
	- Fix displaying of multipart/alternative messages with empty parts (#1488750)
	- Fix threaded list sorting on PHP < 5.2.9 (#1488748)
	- Fix Warning: htmlspecialchars(): charset `RCMAIL_CHARSET' not supported warning in Installer (#1488744)

	RELEASE 0.8.2
	-------------
	- Fix XSS vulnerability from HTTP User-Agent header (#1488737)
	- Force fonts in compose fields to be all the same (#1488690)
	- Fix handling vCard entries with TEL;TYPE=CELL (#1488728)
	- Fix error where session wasn't updated after folder rename/delete (#1488692)
	- Fix PLAIN authentication for some IMAP servers (#1488674)
	- Fix encoding vCard file when contains PHOTO;ENCODING=b (#1488683)
	- Fix focus issue in IE when selecting message row (#1488620)
	- Add full headers view in message preview window (#1488538)
	- Fix message display page issues - unified with message preview (#1488590, #1488642)
	- Fix displaying all headers when they contain malformed characters (#1488666)
	- Fix decoding of HTML messages with UTF-16 charset specified (#1488654)
	- Fix quota capability detection so it can be overwritten by a plugin (#1488655)
	- Fix identity selection on reply (#1488101)
	- Fix Larry's messages list filter in IE (#1488632)
	- Fix more IE issues by disabling Compat. mode with X-UA-Compatible meta tag (#1488626)
	- Fix setting locales under Solaris - use additional .UTF-8 suffix (#1488628)
	- Fix email address validation for addresses with IP address in domain part
	- Fix Larry skin issues in IE7 compat. mode (#1488618)
	- Fix so subscribed non-existing/non-accessible shared folder can be unsubscribed

	RELEASE 0.8.1
	-------------
	- Fix bug where domain name was converted to lower-case even with login_lc=false (#1488593)
	- Fix lower-casing email address on replies (#1488598)
	- Fix line separator in exported messages (#1488603)
	- Fix XSS issue where plain signatures wasn't secured in HTML mode (#1488613)
	- Fix XSS issue where href="javascript:" wasn't secured (#1488613)
	- Fix impossible to create message with empty plain text part (#1488610)
	- Fix stripped apostrophes when replying in plain text to HTML message (#1488606)
	- Fix inactive Save search option after advanced search (#1488607)
	- Fix Remove from group option is active for contact search result (#1488608)
	- Disable autocapitalization in login form on iPad/iPhone (#1488609)
	- Fix focus on the list when list row is clicked (#1488600)
	- Added separate From and To columns apart from smart From/To column (#1486891)
	- Fix fallback to Larry skin when configured skin isn't available (#1488591)
	- Fix (workaround) delete operations with some versions of memcache (#1488592)
	- Fix (disable) request validation for spell and spell_html actions

	RELEASE 0.8.0
	-------------
	- Don't show product version on login screen (can be enabled by config)
	- Renamed old default skin to 'classic'. Larry is the new default skin.
	- Support connections to memcached socket file (#1488577)
	- Enable TinyMCE inlinepopups plugin
	- Update to TinyMCE 3.5.6
	- Correctly escape localized labels in javascript variable (#1488567)
	- Update Net_SMTP/Auth_SASL packages to fix Digest-MD5/Cram-MD5 authentication (#1488571)
	- Don't add attachments content into reply/forward/draft message body (#1488557)
	- Fix 'no connection' errors on page unloads (#1488547)
	- Plugin API: Add 'unauthenticated' hook (#1488138)
	- Show explicit error message when provided hostname is invalid (#1488550)
	- Fix wrong compose screen elements focus in IE9 (#1488541)
	- Fix fatal error when date.timezone isn't set (#1488546)
	- Update to TinyMCE 3.5.4.1
	- Better icons with distinct shapes for priority columns (#1488377)
	- Show dedicated icon for multipart/report messages (#1488524)
	- Properly hide text of icon links/buttons (#1488534)
	- Fix handling of unitless CSS size values in HTML message (#1488535)
	- Fix removing contact photo using LDAP addressbook (#1488420)
	- Fix storing X-ANNIVERSARY date in vCard format (#1488527)
	- Update to Mail_Mime-1.8.5 (#1488521)
	- Fix XSS vulnerability in message subject handling using Larry skin (#1488519)
	- Fix handling of links with various URI schemes e.g. "skype:" (#1488106)
	- Fix handling of links inside PRE elements on html to text conversion
	- Fix indexing of links on html to text conversion
	- Decode header value in rcube_mime::get() by default (#1488511)
	- Fix errors with enabled PHP magic_quotes_sybase option (#1488506)
	- Fix SQL query for contacts listing on MS SQL Server (#1488505)
	- Fix window.resize handler on IE8 and Opera (#1488453)
	- Don't let error message popups cover the login form (#1488500)
	- Update to TinyMCE 3.5.2
	- Don't show errors when moving contacts into groups they are already in (#1488493)
	- Make folders with unread messages in subfolders bold again (#1486793)
	- Abbreviate long attachment file names with ellipsis (#1488499)
	- Fix html2text conversion of strong\|b\|a\|th\|h tags when used in upper case
	- Add listcontrols template container in Larry skin (#1488498)
	- Fix host autoselection when default_host is an array (#1488495)
	- Move messages forwarding mode setting into Preferences
	- Fix HTML entities handling in HTML editor (#1488483)
	- Fix listing shared folders on Courier IMAP (#1488466)

	RELEASE 0.8-rc
	--------------
	- Added new translations in Belarusian, Interlingua and Malayalam
	- Flipped compose options arrow (#1488474)
	- Fix handling of large uuencode attachments (#1488473)
	- Fix handling of "usemap" attribute (#1488472)
	- Fix handling of some HTML tags e.g. IMG (#1488471)
	- Use similar language as a fallback for plugin localization (#1488401)
	- Fix issue where signature wasn't re-added on draft compose (#1488322)
	- Update to TinyMCE 3.5 (#1488459)
	- Fixed multi-threaded autocompletion when number of threads > number of sources
	- Allow to configure the number of values allowed for each LDAP attribute
	- Support for serialized LDAP address values (usually delimited with a $)
	- Less restrictive session auth checks, repeat keep-alive requests on failure (#1488449)
	- Fix redirect to mail/compose on re-login (#1488226)
	- Add IE8 hack for messages list issue (#1487821)
	- Fix handling errors on draft auto-save
	- Fix importing vCard photo with ENCODING param specified (#1488432)
	- Support mutliple name/email pairs for Bcc and Reply-To identity settings (#1488445)
	- Set flexible width to login form fields (#1488418)
	- Fix re-draw bug on list columns change in IE8 (#1487822)
	- Allow mass-removal of addresses from a group (#1487748)
	- Fix removing all contacts on import to LDAP addressbook
	- Fix so "Back" from compose/show doesn't reset search request (#1488238)
	- Add option to delete messages instead of moving to Trash when in Junk folder (#1486686)
	- Fix invisible cursor when replying to a html message (#1487073)
	- Reset IP stored in session when destroying session data (#1488056)
	- Fix bug where memory_limit = -1 wasn't handled properly
	- Support LDAP RFC2256's country object class read/write (#1488123)
	- Upgraded to jQuery 1.7.2
	- Image resize with GD extension (#1488383)
	- Fix lack of warning when switching task in compose window (#1488399)
	- Fix bug where it wasn't possible to enter ( or & characters in autocomplete fields
	- Request all needed fields from address book backends (#1488394)
	- Unified (single) spellchecker button
	- Scroll long lists on drag&drop (#1485946)
	- Copy all skins in installto script (#1488376)

	RELEASE 0.8-beta
	----------------
	- Upgraded to jQuery 1.7.1 (#1488337) and jQuery UI 1.8.18
	- Add Russian to the spellchecker languages list (#1488135)
	- Remember custom skin selection after logout (#1488355)
	- Make sure About tab is always the last tab (#1488257)
	- Fix issue with folder creation under INBOX. namespace (#1488349)
	- Added mailto: protocol handler registration link in User Preferences (#1486580)
	- Handle identity details box with an iframe (#1487020)
	- Fix issue where some text from original message was missing on reply (#1488340)
	- Fix autoselect_host() for login (#1488297)
	- Changed license to GNU GPLv3+ with exceptions for skins & plugins
	- Added address book widget on compose screen
	- Use proper timezones from PHP's internal timezonedb (#1485592)
	- Add separate pagesize setting for mail messages and contacts (#1488269)
	- Deprecate $DB, $USER, $IMAP global variables, Use $RCMAIL instead
	- Add option to set default font for HTML message (#1484137)
	- Fix issues with big memory allocation of IMAP results
	- Prevent from memory_limit exceeding when trying to parse big messages bodies (#1487424)
	- Add possibility to add SASL mechanisms for SMTP in smtp_connect hook (#1487937)
	- Mark (with different color) folders with recent messages (#1486234)
	- Added About tab in Settings
	- TinyMCE updated to 3.4.6

	RELEASE 0.7.2
	-------------
	- Fix encoding of attachment with comma in name (#1488389)
	- Fix handling of % character in IMAP protocol (#1488382)
	- Fix duplicate names handling in addressbook searches (#1488375)
	- Fix displaying of HTML messages from Disqus (#1488372)
	- Disable E_STRICT warnings on PHP 5.4
	- Prevent from folder selection on virtual folder collapsing (#1488346)
	- Fix automatic unsubscribe of non-existent folders
	- Fix double-quotes handling in recipient names
	- User configurable setting how to display contact names in list
	- Make contacts list sorting configurable for the admin/user
	- Fix parse errors in DDL files for MS SQL Server
	- Revert SORT=DISPLAY support, removed by mistake (#1488327)
	- Add lost translation label in de_DE (#1488315)
	- Fix drafts update issues when edited from preview pane (#1488314)
	- Fix wrong variable name in rcube_ldap.php (#1488302)
	- Make mime type detection based on filename extension to be case-insensitive
	- Fix failure on MySQL database upgrade from 0.7 - text column can't have default value (#1488300)


	RELEASE 0.7.1
	-------------
	- Fix bug in handling of base href and inline content (#1488290)
	- Fix SQL Error when saving a contact with many email addresses (#1488286)
	- Fix strict email address searching if contact has more than one address
	- Remove duplicated 'organization' label (#1488287)
	- Fix so editor selector is hidden when 'htmleditor' is listed in 'dont_override'
	- Fix wrong (long) label usage (#1488283)
	- Fix handling of INBOX's subfolders in special folders config (#1488279)
	- Add ifModule statement for setting Options -Indexes in .htaccess file (#1488274)
	- Fix crashes with eAccelerator (#1488256)
	- Fix searching on IMAP servers without CHARSET specifier support (#1488271)
	- Fix expanding folders during drag&drop (#1488260)
	- Fix wrong postgres sequence name in upgrade from 0.6
	- Fix broken CREATE INDEX queries in SQLite DDL files (#1488255)

	RELEASE 0.7
	-----------
	- Make Roundcube render the Email Standards Project Acid Test correctly
	- Replace prompt() with jQuery UI dialog (#1485135)
	- Fix navigation in messages search results
	- Improved handling of some malformed values encoded with quoted-printable (#1488232)
	- Add possibility to do LDAP bind before searching for bind DN
	- Fix handling of empty <U> tags in HTML messages (#1488225)
	- Add content filter for embedded attachments to protect from XSS on IE (#1487895)
	- Use strpos() instead of strstr() when possible (#1488211)
	- Fix handling HTML entities when converting HTML to text (#1488212)
	- Fix fit_string_to_size() renders browser and ui unresponsive (#1488207)
	- Fix handling of invalid characters in request (#1488124)
	- Fix merging some configuration options in update.sh script (#1485864)
	- Fix so TEXT key will remove all HEADER keys in IMAP SEARCH (#1488208)
	- Fix handling contact photo url with https:// prefix (#1488202)
	- Fix possible infinite redirect on attachment preview (#1488199)
	- Improved clickjacking protection for browsers which don't support X-Frame-Options headers
	- Fixed bug where similar folder names were highlighted wrong (#1487860)
	- Fixed bug in handling link with '!' character in it (#1488195)
	- Fixed bug where session ID's length was limited to 40 characters (#1488196)
	- TinyMCE security issue: removed moxieplayer (embedding flv and mp4 is not supported anymore)

	RELEASE 0.7-beta
	----------------
	- Fix handling of HTML form elements in messages (#1485137)
	- Fix regression in setting recipient to self when replying to a Sent message (#1487074)
	- Fix listing of folders in hidden namespaces (#1486796)
	- Don't consider \Noselect flag when building folders tree (#1488004)
	- Fix sorting autocomplete results (#1488084)
	- Add option to set session name (#1486433)
	- Add option to skip alternative email addresses in autocompletion
	- Fix inconsistent behaviour of Compose button in Drafts folder, add Edit button for drafts
	- Fix problem with parsing HTML message body with non-unicode characters (#1487813)
	- Add option to define matching method for addressbook search (#1486564, #1487907)
	- Make email recipients separator configurable
	- Fix so folders with \Noinferiors attribute aren't listed in parent selector
	- Fix handling of curly brackets in URLs (#1488168)
	- Fix handling of dates (birthday/anniversary) in contact data (#1488147)
	- Fix error on opening searched LDAP contact (#1488144)
	- Fix redundant line break in flowed format (#1488146)
	- Fix IDN address validation issue (#1488137)
	- Fix JS error when dst_active checkbox doesn't exist (#1488133)
	- Autocomplete LDAP records when adding contacts from mail (#1488073)
	- Plugin API: added 'ready' hook (#1488063)
	- Ignore DSN request when it isn't supported by SMTP server (#1487800)
	- Make sure LDAP name fields aren't arrays (#1488108)
	- Fixed imap test to non-default port when using ssl (#1488118)
	- Force all files to be overwritten when updating (#1488117)
	- Fix issue where it wasn't possible to change list view mode in folder manager for INBOX (#1488107)
	- Fix namespace handling in special folders settings (#1488112)
	- Disable time limit for CLI scripts (#1488109)
	- Fix misleading display when chaning editor type (#1488104)
	- Add loading indicator on contact delete
	- Fix bug where after delete message rows can be added to the list of another folder (#1487752)
	- Add notice on autocompletion that not all records were displayed
	- Add option 'searchonly' for LDAP address books
	- Add Priority filter to the messages list
	- Cache synchronization using QRESYNC/CONDSTORE
	- Trigger 'new_messages' hook for all checked folders (#1488083)
	- Make date/time format user configurable; drop 'date_today' config option
	- Fix setting title for truncated subject in IE (#1487128)
	- Fix displaying multipart/alternative messages with only one part (#1487938)
	- Rewritten messages caching:
	Indexes are stored in a separate table, so there's no need to store all messages in a folder
	Added threads data caching
	Flags are stored separately, so flag change doesn't cause DELETE+INSERT, just UPDATE
	- Improved FETCH response handling
	- Improvements in response tokenization method
	- Use 'From' and 'To' labels instead of 'Sender' and 'Recipient'
	- Fix username case-insensitivity issue in MySQL (#1488021)
	- Addressbook Saved Searches
	- Added spellchecker exceptions dictionary (shared or per-user)
	- Added possibility to ignore words containing caps, numbers, symbols (spellcheck_ignore_* options)
	- Added 'priority' column on messages list (#1486782)
	- Localize forwarded message header (#1488058)

	RELEASE 0.6
	-----------
	- Fix bug where the last identity is used on reply (#1488101)
	- Fix locked folder rename option on servers supporting RFC2086 only (#1488089)
	- Fix session race conditions when composing new messages
	- Fix encoding of LDAP contacts identifiers (#1488079)
	- jQuery 1.6.4
	- Fix handling of binary attachments encoded with quoted-printable (#1488065)
	- Fix text-overflow:ellipsis issues on messages list in FF7 and Webkit (#1488061)
	- Fix handling of links with IP address
	- Fix compacting folder resets message list filter (#1488076)

	RELEASE 0.6-rc
	----------------
	- Send X-Frame-Options headers to protect from clickjacking (#1487037)
	- Fallback to mail_domain in LDAP variable replacements; added 'host' to 'user_create' hook arguments (#1488024)
	- Fixed wrong vCard type parameter mobile (#1488067)
	- Fixed vCard WORKFAX issue (#1488046)
	- Add vCard's Profile URL support (#1488062)
	- jQuery 1.6.3
	- Fix imap_cache setting to values other than 'db' (#1488060)
	- Fix handling of attachments inside message/rfc822 parts (#1488026)
	- Make list of mimetypes that open in preview window configurable (#1487625)
	- Added plugin hook 'message_part_get' for attachment downloads
	- Added unique connection identifier to IMAP debug messages
	- Fix image type check for contact photo uploads

	RELEASE 0.6-beta
	----------------
	- Fixed selecting identity on reply/forward (#1487981)
	- Add option to hide selected LDAP addressbook on the list
	- Add client-side checking of uploaded files size
	- Add newlines between organization, department, jobtitle (#1488028)
	- Recalculate date when replying to a message and localize the cite header (#1487675)
	- Fix handling of email addresses with quoted local part (#1487939)
	- Fix EOL character in vCard exports (#1487873)
	- Added optional "multithreading" autocomplete feature
	- Plugin API: Added 'config_get' hook
	- Fixed new_user_identity plugin to work with updated rcube_ldap class (#1487994)
	- Plugin API: added folder_delete and folder_rename hooks
	- Added possibility to undo last contact delete operation
	- Fix sorting of contact groups after group create (#1487747)
	- Add optional textual upload progress indicator (#1486039)
	- Fix parsing URLs containing commas (#1487970)
	- Added vertical splitter for books/groups list in addressbook (#1487923)
	- Improved namespace roots handling in folder manager
	- Added searching in all addressbook sources
	- Added addressbook source selection in contacts import
	- Implement LDAPv3 Virtual List View (VLV) for paged results listing
	- Use 'address_template' config option when adding a new address block (#1487944)
	- Added addressbook advanced search
	- Add popup with basic fields selection for addressbook search
	- Case-insensitive matching in autocompletion (#1487933)
	- Added option to force spellchecking before sending a message (#1485458)
	- Fix handling of "<" character in contact data, search fields and folder names (#1487864)
	- Fix saving "<" character in identity name and organization fields (#1487864)
	- Added option to specify to which address book add new contacts
	- Added plugin hook for keep-alive requests
	- Store user preferences in session when write-master is not available and session is stored in memcache, write them later
	- Improve performence of folder manager operations
	- Fix default_port option handling in Installer when config.inc.php file exists (#1487925)
	- Removed option focus_on_new_message, added newmail_notifier plugin
	- Added general rcube_cache class with Memcache and APC support
	- Improved caching performance by skipping writes of unchanged data
	- Option enable_caching replaced by imap_cache and messages_cache options
	- Fix WORKFAX saving in address book (#1487910)
	- Add forward-as-attachment feature
	- jQuery-1.6.2 (#1487913, #1487144)
	- Improve display name composition when saving contacts (#1487143)
	- Fix problems with subfolders of INBOX folder on some IMAP servers (#1487725)
	- Fix handling of folders that doesn't belong to any namespace (#1487637)
	- Enable multiselection for attachments uploading in capable browsers (#1485969)
	- Add possibility to change HTML editor configuration by skin
	- Fix a bug where selecting too many contacts would produce too large URI request (#1487892)
	- Improve performance by including files with absolute path (#1487849)
	- Move folder name truncation to client/skin (#1485412)
	- Added plugin hook for request token creation
	- Replace LDAP vars in group queries (#1487837)
	- Fix vcard folding with uncode characters (#1487868)
	- Keep all submitted data if contact form validation fails (#1487865)
	- Handle uncode strings in rcube_addressbook::normalize_string() (#1487866)
	- Fix handling of debug_level=4 in ajax requests (#1487831)
	- Enable TinyMCE's contextmenu (#1487014)
	- Allow multiple concurrent compose sessions
	- New config option for custom logo
	- Allow skins to define/override texts with <roundcube:label />
	- Add simple ACL rights/namespace handling in folder manager
	- Force IE to send referers (#1487806)
	- Better display of vcard import results (#1485457)
	- Improved vcard import
	- Interactive update script with improved DB schema check
	- Fix problem with contactgroupmembers table creation on MySQL 4.x, add index on contact_id column
	- Add LDAP SASL bind and proxy authentication (#1486692)
	- Replying to a sent message puts the old recipient as the new recipient (#1487074)
	- Fulltext search over (almost) all data for contacts
	- Extend address book with rich contact information

	RELEASE 0.5.4
	-------------
	- Fix XSS vulnerability in UI messages (#1488030)

	RELEASE 0.5.3
	-------------
	- Fix identities "reply-to" and "bcc" fields have a bogus value when left empty (#1487943)
	- Fix issue which cases IMAP disconnection when encrypt() method was used (#1487900)
	- Fix some CSS issues in Settings for Internet Explorer
	- Fixed handling of folder with name "0" in folder selector
	- Fix bug where messages were deleted instead moved to trash folder after Shift key was used (#1487902)
	- Fix relative URLs handling according to a <base> in HTML (#1487889)
	- Fix handling of top-level domains with more than 5 chars or unicode chars (#1487883)
	- Fix usage of non-standard HTTP error codes (#1487797)
	- Fix PHP warning on mistaken in_array() usage (#1487901)

	RELEASE 0.5.2
	-------------
	- TinyMCE 3.4.2 now compatible with IE9
	- PEAR::Net_SMTP 1.5.2, fixed timeout issue (#1487843)
	- Fix bug where template name without plugin prefix was used in render_page hook
	- Support 'abort' and 'result' response in 'preferences_save' hook, add error handling
	- Fix bug where some content would cause hang on html2text conversion (#1487863)
	- Improve space-stuffing handling in format=flowed messages (#1487861)
	- Fix bug where some dates would produce SQL error in MySQL (#1487856)
	- Added workaround for some IMAP server with broken STATUS response (#1487859)
	- Fix bug where default_charset was not used for text messages (#1487836)
	- Stateless request tokens. No keep-alive necessary on login page (#1487829)
	- Force names of unique constraints in PostgreSQL DDL
	- Add code for prevention from IMAP connection hangs when server closes socket unexpectedly
	- Remove redundant DELETE query (for old session deletion) on login
	- Get around unreliable rand() and mt_rand() in session ID generation (#1486281)
	- Fix some emails are not shown using Cyrus IMAP (#1487820)
	- Fix handling of mime-encoded words with non-integral number of octets in a word (#1487801)
	- Fix parsing links with non-printable characters inside (#1487805)
	- Fixed de_CH Localization bugs (#1487773)
	- Add variable for 'Today' label in date_today option (#1486120)
	- Fix dont_override setting does not override existing user preferences (#1487664)
	- Use only one from IMAP authentication methods to prevent login delays (1487784)
	- Support strftime format in date_today option
	- Fix SQL query in rcube_user::query() so it uses index on MySQL again
	- Removed redundant </form> tags from contact add/edit pages
	- Fix CSS error in contact details screen on IE7 (#1487775)

	RELEASE 0.5.1
	-------------
	- Fix handling of attachments with invalid content type (#1487767)
	- Add workaround for DBMail's bug http://www.dbmail.org/mantis/view.php?id=881 (#1487766)
	- Use IMAP's ID extension (RFC2971) to print more info into debug log
	- Security: add optional referer check to prevent CSRF in GET requests
	- Fix email_dns_check setting not used for identities/contacts (#1487740)
	- Fix ICANN example addresses doesn't validate (#1487742)
	- Security: protect login form submission from CSRF
	- Security: prevent from relaying malicious requests through modcss.inc
	- Fix handling of non-image attachments in multipart/related messages (#1487750)
	- Fix IDNA support when IDN/INTL modules are in use (#1487742)
	- Fix handling of invalid HTML comments in messages (#1487759)
	- Fix parsing FETCH response for very long headers (#1487753)
	- Fix add/remove columns in message list when message_sort_order isn't set (#1487751)
	- Check mime headers before attempt to parse them (#1487745)
	- Quote header values in show_additional_headers plugin (#1487744)
	- Fix settings UI on IE 6 (#1487724)
	- Remove double borders in folder listing (#1487713)
	- Separate full message headers UI element from headers table (#1487715)
	- Add part MIME ID to message_part_* hooks (#1487718)
	- Improve parsing of MS Outlook vCards (#1487716)
	- Updated PEAR::Net_Socket to 1.0.10
	- Updated PEAR::Net_IDNA2 to 0.1.1
	- Fix handling of comments inside an email address spec. (#1487673)
	- Show full mail subject as title when hovering a cut subject link (#1487128)
	- Fix randomly disappearing folders list in IE (#1487704)
	- Fix list column add/removal in IE (#1487703)
	- Fix login redirect issues (#1487686)
	- Require PHP 5.2.1 or greater
	- Fix %h/%z variables in username_domain option (#1487701)
	- Workaround for setting charset in case of malformed bodystructure response (#1487700)
	- Fix impossible to subscribe to protected folders (#1487656)
	- Fix setting timezone in Preferences (#1487705)

	RELEASE 0.5
	-----------
	- Fix double-login/session issue (#1487104)
	- Wrap HTML parts with <html><body> and add Doctype declaration (#1487098)
	- Make rcube_autoload silently skip unknown classes (#1487109)
	- Fix charset detection in vcards with encoded values (#1485542)
	- Better CSS cursors for splitters (#1486874)
	- Show the same message only once (#1487641)
	- Fix namespaces handling (#1487649)
	- Add handling of multifolder METADATA/ANNOTATION responses
	- Fix handling of INBOX when personal namespace prefix is non-empty (#1487657)
	- Fix handling square brackets in links (#1487672)
	- Add description of 'use_https' option in main.inc.php.dist file

	RELEASE 0.5-RC
	--------------
	- Plugin API: Add 'pass' argument in 'authenticate' hook (#1487134)
	- Fix attachments of type message/rfc822 are not listed on attachments list
	- Add 'login_lc' config option for case-insensitive authentication (#1487113)
	- Fix window is blur'ed in IE when selecting a message (#1487316)
	- Fix cursor position on compose form in Webkit browsers (#1486674)
	- Fix setting charset of attachment filenames (#1487122)
	- Allow setting autocomplete attribute for all inputs separately (#1487313)
	- New Folder Manager UI
	- Fix invalid Request when creating a folder (#1487443)
	- Add folder size and quota indicator in folder manager (#1485780)
	- Add possibility to move a subfolder into root folder (#1486791)
	- Fix copying all messages in a folder copies only messages from current page
	- Improve performance of moving or copying of all messages in a folder
	- Fix plaintext versions of HTML messages don't contain placeholders for emotions (#1485206)
	- Improve performance of folder rename and delete actions
	- Better support for READ-ONLY and NOPERM responses handling (#1487083)
	- Add confirmation message on purge/expunge command response
	- Fix handling of untagged responses for AUTHENTICATE command (#1487450)
	- Add username and IP address to log message on unsuccessful login (#1487626)
	- Improved Mail-Followup-To and Mail-Reply-To headers handling
	- Fix charset conversion for text attachments without charset specification (#1487634)

	RELEASE 0.5-BETA
	----------------
	- Make session data storage more robust against garbage session data (#1487136)
	- Config option for autocomplete on login screen
	- Allow plugin templates to include local files (#1487133)
	- List groups in address detail view and allow to subscribe/unsubscribe from there (#1486753)
	- Messages caching: performance improvements, fixed syncing, fixes related with #1486748
	- Add link to identities in compose window (#1486729)
	- Add Internationalized Domain Name (IDNA) support (#1483894)
	- Add option to automatically send read notifications for known senders (#1485883)
	- Add option to "Return receipt" will be always checked (#1486352)
	- Fix HTML to plain text conversion doesn't handle citation blocks (#1486921)
	- Use custom sorting when SORT is disabled by IMAP admin (#1486959)
	- Allow setting some washtml options from plugin (#1486578)
	- Add option do bind for an individual LDAP address book (#1486997)
	- Change reply prefix to display email address only if sender name doesn't exist (#1486550)
	- Plugin API: improved 'abort' flag handling, added 'result' item in some hooks (#1486914)
	- Fix mailto optional params in plain text messages aren't handled (#1487026)
	- Add Reply-to-List feature (#1484252)
	- Add Mail-Followup-To/Mail-Reply-To support (#1485547)
	- Fix confirmation message isn't displayed after sending mail on Chrome (#1486177)
	- Fix keyboard doesn't work with autocomplete list with Chrome (#1487029)
	- Improve tabs to fixed width and add tabs in identities info (#1486974)
	- Add unique index on users.username+users.mail_host
	- Make htmleditor option more consistent and add option to use HTML on reply to HTML message (#1485840)
	- Use empty envelope sender address for message disposition notifications (RFC 2298.3)
	- Support SMTP Delivery Status Notifications - RFC 3461 (#1486142)
	- Use css sprite image for messages list
	- Add (different) attachment icon for messages of type multipart/report (#1486165)
	- Prevent from inserting empty link when composing HTML message (#1486944)
	- Add caching support in id2uid and uid2id functions (#1487019)
	- Add SASL proxy authentication for SMTP (#1486693)
	- Improve displaying of UI messages (#1486977)
	- Fix double e-mail filed in identity form (#1487054)
	- Display IMAP errors for LIST/THREAD/SEARCH commands (#1486905)
	- Add LITERAL+ (IMAP4 non-synchronizing literals) support (RFC 2088)
	- Add separate column for message status icon (#1486665)
	- Add ACL extension support into IMAP classes (RFC 4314)
	- Add ANNOTATEMORE extension support into IMAP classes (draft-daboo-imap-annotatemore)
	- Add METADATA extension support into IMAP classes (RFC 5464)
	- Fix decoding of e-mail address strings in message headers (#1487068)
	- Fix handling of attachments when Content-Disposition is not inline nor attachment (#1487051)
	- Improve performance of unseen messages counting (#1487058)
	- Improve performance of messages counting using ESEARCH extension (RFC4731)
	- Add LIST-STATUS support in rcube_imap_generic class (RFC 5819)
	- Add SASL-IR support in IMAP (RFC 4959)
	- Add LOGINDISABLED support (RFC 2595)
	- Add support for AUTH=PLAIN in IMAP authentication
	- Re-implemented SMTP proxy authentication support
	- Add support for IMAP proxy authentication (#1486690)
	- Add support for AUTH=DIGEST-MD5 in IMAP (RFC 2831)
	- Fix parent folder with unread subfolder not bold when message is open (#1487078)
	- Add basic IMAP LIST's \Noselect option support
	- Add support for selection options from LIST-EXTENDED extension (RFC 5258)
	- Don't list subscribed but non-existent folders (#1486225)
	- Fix handling of URLs with tilde (~) or semicolon (;) character (#1487087, #1487088)
	- Plugin API: added 'contact_form' hook
	- Add SORT=DISPLAY support (RFC 5957)
	- Plugin API: add possibility to disable plugin in AJAX mode, 'noajax' property
	- Plugin API: add possibility to disable plugin in framed mode, 'noframe' property
	- Improve performance of setting IMAP flags using .SILENT suffix
	- Improve performance of message cache status checking with skip_disabled=true
	- Support contact's email addresses up to 255 characters long (#1487095)
	- Add option to place replies in the folder of the message being replied to (#1485945)
	- Add missing confirmation/error messages on contact/group/message actions (#1486845)
	- Add 'loading' message on message move/copy/delete/mark actions
	- Improve responsiveness of messages displaying (#1486986)
	- Add option for minimum length of autocomplete's string (#1486428)
	- Fix operations on messages in unsubscribed folder (#1487107)
	- Add support for shared folders (#1403507)
	- Fix handling of folders with name "0" (#1487119)
	- Fix handling of folders with "<>" characters in name
	- jQuery 1.4.4
	- Fix handling of HTML entity strings in plain text messages
	- Fix focused elements aren't unfocused when clicking on the list (#1487123)
	- Fix error in MSSQL DDL scripts (#1487112)
	- Lock submit button in onsubmit event on login page (#1487036)
	- Don't set attachment's charset in Content-type header (#1487122)
	- Fix handling of message bodies (quoted-printable encoded) with NULL characters (#1486189)
	- Add workaround for MSOE's multipart/related messages with non-related attachments

	RELEASE 0.4.2
	-------------
	- Fix handling of backslash as IMAP delimiter
	- Fix charset replacement in HTML message bodies (#1487021)
	- Fix: contact group input is empty when using rename action more than once on the same group record
	- Fix "Server Error! (Not Found)" when using utils/save-pref action (#1487023)
	- Fix handling of Thunderbird's vCards (#1487024)

	RELEASE 0.4.1
	-------------
	- Fix space-stuffing in format=flowed messages (#1487018)
	- Fix msgexport.sh now using the new imap wrapper
	- Avoid displaying password on shell (#1486947)
	- Only lower-case user name if first login attempt failed (#1486393)
	- Make alias setting in squirrelmail_usercopy plugin configurable (patch by pommi, #1487007)
	- Prevent from saving a non-existing skin path in user prefs (#1486936)
	- Improve handling of single-part messages with bogus BODYSTRUCTURE (#1486898)
	- Fix path to SQL files when using pgsql/mysqli/sqlsrv drivers (#1486902)
	- Fix upgrade script for SQLite (#1486903)
	- Fixes in SQL init script + added update script for MSSQL database
	- Remove redundant date in syslog messages (#1486945)
	- Fix contacts list page controls when a group is selected (#1486946)
	- Fix SMTP test in Installer (#1486952)
	- Fix "Select all" causes message to be opened in folder with exactly one message (#1486913)
	- Fix Tab key doesn't work in HTML editor in Google Chrome (#1486925)
	- Fix TinyMCE uses zh_CN when zh_TW locale is set (#1486929)
	- Fix TinyMCE buttons are hidden in Opera (#1486922)
	- Fix JS error on IE when trying to send HTML message with enabled spellchecker (#1486940)
	- Display inline images with known extensions and non-image content-type (#1486934)
	- Fix "Threaded" checkbox after subfolder creation (#1486928)
	- Fix timezone string in sent mail (#1486961)
	- Show disabled checkboxes for protected folders instead of dots (#1485498)
	- Added fieldsets in Identity form, added 'identity_form' hook
	- Re-added 'Close' button in upload form (#1486930, #1486823)
	- Fix handling of charsets with LATIN-* label
	- Fix messages background image handling in some cases (#1486990)
	- Fix format=flowed handling (#1486989)
	- Fix when IMAP connection fails in 'get' action session shouldn't be destroyed (#1486995)
	- Fix list_cols is not updated after column dragging (#1486999)
	- Support %z variable in host configuration options (#1487003)

	RELEASE 0.4
	-----------
	- Fix disapearing upload form disapears when user selects a file on Safari (#1486823)
	- Don't replace error messages with loading info (#1486300)
	- Fix JS errors on compose mode switch (#1486870)
	- Fix message structure parsing when it lacks optional fields (#1486881)
	- Include all recipients in sendmail log
	- Support HTTP_X_FORWARDED_PROTO header for HTTPS detecting (#1486866)
	- Fix default IMAP port configuration (#1486864)
	- Create Sent folder when starting to compose a new message (#1486802)
	- Fix handling of messages with Content-Type: application/* and no filename (#1484050)
	- Improved compose screen: resizable body and attachments list, vertical splitter, options menu
	- Fix RC forgets search results (#1483883)
	- TinyMCE 3.3.7
	- Improve parsing of styled empty tags in HTML messages (#1486812)
	- Add %dc variable support in base_dn/bind_dn config (#1486779)
	- Add button to hide/unhide the preview pane (#1484215)
	- Fix no-cache headers on https to prevent content caching by proxies (#1486798)
	- Fix attachment filenames broken with TNEF decoder using long filenames (#1486795)
	- Use user's timezone in Date header, not server's timezone (#1486119)
	- Add option to set separate footer for HTML messages (#1486660)
	- Add real SMTP error description to displayed error messages (#1485927)
	- Fix some IMAP errors handling when opening the message (#1485443)
	- Fix related parts aren't displayed when got mimetype other than image/* (#1486432)
	- Multiple identity and database support for squirrelmail_usercopy plugin (#1486517)
	- Support dynamic hostname (%d/%n) variables in configuration options (#1485438)
	- Add 'messages_list' hook (#1486266)
	- Add request* event triggers in http_post/http_request (#1486054)
	- Fix use RFC-compliant line-delimiter when saving messages on IMAP (#1486712)
	- Add 'imap_timeout' option (#1486760)
	- Fix forwarding of messages with winmail attachments
	- Fix handling of uuencoded attachments in message body (#1485839)
	- Added list_mailboxes hook in rcube_imap::list_unsubscribed() (#1486668)
	- Fix wrong message on file upload error (#1486725)
	- Add support for data URI scheme [RFC2397] (#1486740)
	- Added 'actionbefore', 'actionafter', 'responsebefore', 'responseafter' events
	- Fix double-addition of e-mail domain to content ID in HTML images
	- Read and send messages with format=flowed (#1484370), fixes word wrapping issues (#1486543)
	- Fix duplicated attachments when forwarding a message (#1486487)
	- Fix message/rfc822 attachments containing only attachments are not parsed properly (#1486743)
	- Fix %00 character in winmail.dat attachments names (#1486738)
	- Fix handling errors of folder deletion (#1486705)
	- Parse untagged CAPABILITY response for LOGIN command (#1486742)
	- Renamed all php-cli scripts to use .sh extension
	- Some files from /bin + spellchecking actions moved to the new 'utils' task
	- Added thread tree icons
	- Extend contact groups support (#1486682)
	- Fix check-recent action issues and performance (#1486526)
	- Fix messages order after checking for recent (#1484664)
	- Fix autocomplete shows entries without email (#1486452)
	- Fix listupdate event doesn't trigger on search response (#1486708)
	- Fix select_all_mode value after selecting a message (#1486720)
	- Set focus to editor on reply in HTML mode (#1486632)
	- Fix composing in HTML jumps cursor to body instead of recipients (#1486674)
	- Allow columns order change per user - drag&drop (#1485795)
	- Add References header in read receipt (#1486681)
	- Fix database constraint violation when opening a message (#1486696)
	- Add 'loading' message while login is in progress (#1486667)
	- Fix quota_zero_as_unlimited (#1486662)
	- Fix folder subscription checking (#1486684)
	- Fix INBOX appears (sometimes) twice in mailbox list (#1486672)
	- Fix listing of attachments of some types e.g. "x-epoc/x-sisx-app" (#1486653)
	- Fix DB Schema checking when some db_table_* options are not set (#1486654)

	RELEASE 0.4-beta
	----------------
	- Add sizelimit and timelimit variables in LDAP config (#1486544)
	- Hide IMAP host dropdown when single host is defined (#1486326)
	- Add images pre-loading on login page (#1451160)
	- Add HTTP_X_REAL_IP and HTTP_X_FORWARDED_FOR to successful logins log (#1486441)
	- Fix setting spellcheck languages with extended codes (#1486605)
	- Fix messages list scrolling in FF3.6 (#1486472)
	- Fix quicksearch input focus (#1486637)
	- Always set changed date when flagging a DB record as deleted + provide a cleanup script
	- Fix address book/group selection (#1486619)
	- Assign newly created contacts to the active group (#1486626)
	- Added option not to mark messages as read when viewed in preview pane (#1485012)
	- Allow plugins modify the Sent folder when composing (#1486548)
	- Added optional (max_recipients) support to restrict total number of recipients per message (#1484542)
	- Re-organize editor buttons, add blockquote and search buttons
	- Make possible to write inside or after a quoted html message (#1485476)
	- Fix bugs on unexpected IMAP connection close (#1486190, #1486270)
	- Iloha's imap.inc rewritten into rcube_imap_generic class
	- Added contact groups in address book (not finished yet)
	- Added PageUp/PageDown/Home/End keys support on lists (#1486430)
	- Added possibility to select all messages in a folder (#1484756)
	- Added 'imap_force_caps' option for after-login CAPABILITY checking (#1485750)
	- Password: Support dovecotpw encryption
	- TinyMCE 3.3.1
	- Implemented messages copying using drag&drop + SHIFT (#1484086)
	- Improved performance of folders operations (#1486525)
	- Fix blocked.gif attachment is not attached to the message (#1486516)
	- Managesieve: import from Horde-INGO
	- Managesieve: support for more than one match (#1486078)
	- Managesieve: support for selectively disabling rules within a single sieve script (#1485882)
	- Threaded message listing now available
	- Added sorting by ARRIVAL and CC
	- Message list columns configurable by the user
	- Removed 'index_sort' option, now we're using empty 'message_sort_col' for this
	- virtuser_query: support other identity data (#1486148)
	- Options virtuser_* replaced with virtuser_* plugins
	- Plugin API: Implemented 'email2user' and 'user2email' hooks
	- Fix forwarding message omits CC header (#1486305)
	- Add 'default_charset' option to user preferences (#1485451)
	- Add 'delete_always' option to user preferences
	- Support/Require tls:// prefix in 'smtp_server' option for TLS connections
	- Fix inconsistent behaviour of 'delete_always' option (#1486299)
	- Fix deleting all messages from last list page (#1486293)
	- Flag original messages when sending a draft (#1486203)
	- Changed signature separator when top-posting (#1486330)
	- Let the admin define defaults for search modifiers (#1485897)
	- Fix long e-mail addresses validation (#1486453)
	- Remember search modifiers in user prefs (#1486146)
	- Added force_7bit option to force MIME encoding of plain/text messages (#1486510)
	- Use case sensitive check when checking for default folders (#1486346)
	- Fix checking for new mail: now checks unseen count of inbox (#1485794)
	- Improve performance by avoiding unnecessary updates to the session table (#1486325)
	- Fix invalid <font> tags which cause HTML message rendering problems (#1486521)
	- Fix CVE-2010-0464: Disable DNS prefetching (#1486449)
	- Fix Received headers to behave better with SpamAssassin (#1486513)
	- Password: Make passwords encoding consistent with core, add 'password_charset' global option (#1486473)
	- Fix adding contacts SQL error on mysql (#1486459)
	- Squirrelmail_usercopy: support reply-to field (#1486506)
	- Fix IE spellcheck suggestion popup issue (#1486471)
	- Fix email address auto-completion shows regexp pattern (#1486258)
	- Fix merging of configuration parameters: user prefs always survive (#1486368)
	- Fix quota indicator value after folder purge/expunge (#1486488)
	- Fix external mailto links support for use as protocol handler (#1486037)
	- Fix attachment excessive memory use, support messages of any size (#1484660)
	- Fix setting task name according to auth state
	- Password: fix vpopmaild driver (#1486478)
	- Add workaround for MySQL bug [http://bugs.mysql.com/bug.php?id=46293] (#1486474)
	- Fix quoted text wrapping when replying to an HTML email in plain text (#1484141)
	- Fix handling of extended mailto links (with params) (#1486354)
	- Fix sorting by date of messages without date header on servers without SORT (#1486286)
	- Fix inconsistency when not using default table names (#1486467)
	- Fix folder rename/delete buttons do not appear on creation of first folder (#1486468)
	- Fix character set conversion fails on systems where iconv doesn't accept //IGNORE (#1486375)
	- Log in performance: Create default folders on first login only
	- Import contacts into the selected address book (by Phil Weir)
	- Add support for MDB2's 'sqlsrv' driver (#1486395)
	- Use jQuery-1.4
	- Removed problematic browser-caching of messages
	- Fix incompatybility with suhosin.executor.disable_emodifier (#1486321)
	- Use PLAIN auth when CRAM fails and imap_auth_type='check' (#1486371)
	- Fix removal of <title> tag from HTML messages (#1486432)
	- Fix 'force_https' to specified port when URL contains a port number (#1486411)
	- Fix to-text converting of HTML entities inside b/strong/th/hX tags (#1486422)
	- Bug in spellchecker suggestions when server charset != UTF8 (#1486406)
	- Managesieve: Fix requires generation for multiple actions (#1486397)
	- Fix LDAP problem with special characters in RDN (#1486320)
	- Improved handling of message parts of type message/rfc822
	- Plugin API: added 'quota' hook
	- Fix parsing conditional comments in HTML messages (#1486350)
	- Use built-in json_encode() for proper JSON format in AJAX replies
	- Allow setting only selected params in 'message_compose' hook (#1486312)
	- Plugin API: added 'message_compose_body' hook (#1486285)
	- Fix counters of all folders are checked in 'getunread' action with check_all_folders disabled (#1486128)
	- Fix displaying alternative parts in messages of type message/rfc822 (#1486246)
	- Fix possible messages exposure when using Roundcube behind a proxy (#1486281)
	- Fix unicode para and line separators in javascript response (#1486310)
	- Additional_message_headers: allow unsetting headers, support plugin's config file (#1486268)
	- Fix displaying of hidden directories in skins list (#1486301)
	- Fix open_basedir restriction error when reading skins list (#1486304)
	- Fix pasting from Office apps into html editor (#1486271)
	- Fix empty <a> tags parsing (#1486272)
	- Don't cut off attachment names when using non-RFC2231 encoding (#1485515)
	- Allow inserting signatures above replied message body (#1484272)
	- Managesieve 2.0: multi-script support
	- Fix imap_auth_type regression (#1486263)

	RELEASE 0.3.1
	------------------
	- Specify toolbar container in compose template (#1486247)
	- Fix $_SERVER['HTTPS'] check for SSL forcing on IIS (#1486243)
	- Avoid unnecessary page loads for selected tab (#1486032)
	- Fix quota indicator issues by content generation on client-size (#1486197, #1486220)
	- Don't display disabled sections in Settings (#1486099)
	- Added server-side e-mail address validation with 'email_dns_check' option (#1485857)
	- Fix login page loading into an iframe when session expires (#1485952)
	- Allow setting port number in 'force_https' option (#1486091)
	- Option 'force_https' replaced by 'force_https' plugin
	- Fix IE issue with non-UTF-8 characters in AJAX response (#1486159)
	- Partially fixed "empty body" issue by showing raw body of malformed message (#1486166)
	- Fix importing/sending to email address with whitespace (#1486214)
	- Added XIMSS (CommuniGate) driver for Password plugin
	- Fix newly attached files are not saved in drafts w/o editing any text (#1486202)
	- Added attachment upload indicator with parallel upload (#1486058)
	- Use default_charset for bodies of messages without charset definition (#1486187)
	- Password: added cPanel driver
	- Fix return to first page from e-mail screen (#1486105)
	- Fix handling HTML comments in HTML messages (#1486189)
	- Fix folder/messagelist controls alignment - icons used (#1486072)
	- Fix LDAP addressbook shows 'Contact not found' error sometimes (#1486178)
	- Fix cache status checking + improve cache operations performance (#1486104)
	- Prevent from setting INBOX as any of special folders (#1486114)
	- Fix regular expression for e-mail address (#1486152)
	- Fix Received header format
	- Implemented sorting by message index - added 'index_sort' option (#1485936)
	- Fix dl() use in installer (#1486150)
	- Added 'ldap_debug' option
	- Fix "Empty startup greeting" bug (#1486085)
	- Fix setting user name in 'new_user_identity' plugin (#1486137)
	- Fix incorrect count of new messages in folder list when using multiple IMAP clients (#1485995)
	- Fix all folders checking for new messages with disabled caching (#1486128)
	- Support skins in 'archive' and 'markasjunk' plugins
	- Added 'html_editor' hook (#1486068)
	- Fix DB constraint violation when populating messages cache (#1486052)
	- Password: added password strength options (#1486062)
	- Fix LDAP partial result warning (#1485536)
	- Fix delete in message view deletes permanently with flag_for_deletion=true (#1486101)
	- Use faster/secure mt_rand() (#1486094)
	- Fix roundcube hangs on empty inbox with bincimapd (#1486093)
	- Fix wrong headers for IE on servers without $_SERVER['HTTPS'] (#1485926)
	- Force IE style headers for attachments in non-HTTPS session, 'use_https' option (#1485655)
	- Check 'post_max_size' for upload max filesize (#1486089)
	- Password Plugin: Fix %d inserts username instead of domain (#1486088)
	- Fix rcube_mdb2::affected_rows() (#1486082)

	RELEASE 0.3-stable
	------------------
	- Fix gn and givenName should be synonymous in LDAP addressbook (#1485892)
	- Add mail_domain to LDAP email entries without @ sign (#1485201)
	- Fix saving empty values in LDAP contact data (#1485781)
	- Fix LDAP contact update when RDN field is changed (#1485788)
	- Fix LDAP attributes case senitivity problems (#1485830)
	- Fix LDAP addressbook browsing when only one directory is used (#1486022)
	- Fix endless loop on error response for APPEND command (#1486060)
	- Don't require date.timezone setting in installer (#1485989)
	- Fix date sorting problem with Courier IMAP server (#1486065)
	- Unselect pressed buttons on mouse up (#1485987)
	- Don't set php_value error_log in .htaccess but mention in INSTALL (#1485924)
	- Fix too small status/flag/attachment columns in Safari 4 (#1486063)
	- Fix selection disabling while dragging splitter in webkit browsers (#1486056)
	- Added 'new_messages' plugin hook (#1486005)
	- Added 'logout_after' plugin hook (#1486042)
	- Added 'message_compose' hook
	- Added 'imap_connect' hook (#1485956)
	- Fix vcard_attachments plugin (#1486035)
	- Updated PEAR::Auth_SASL to 1.0.3 version
	- Use sequence names only with PostgreSQL (#1486018)
	- Re-designed User Preferences interface
	- Fix MS SQL DDL (#1486020)
	- Fix rcube_mdb2.php: call to setCharset not implemented in mssql driver (#1486019)
	- Added 'display_next' option
	- Fix rcube_mdb2::unixtimestamp for MS SQL (#1486015)
	- Fix HTML washing to respect character encoding
	- Fix endless loop in iil_C_Login() with Courier IMAP (#1486010)
	- Fix #messagemenu display on IE (#1486006)
	- Speedup UI by using sprites for (toolbar) buttons
	- Fix charset names with X- prefix handling
	- Fix displaying of HTML messages with unknown/malformed tags (#1486003)

	RELEASE 0.3-RC1
	---------------
	- Fix import of vCard entries with params (#1485453)
	- Fix HTML messages output with empty block elements (#1485974)
	- Use request tokens to protect POST requests from CSRF
	- Added hook when killing a session
	- Added hook to write_log function (#1485971)
	- Performance improvements by use UID commands (#1485690)
	- Fix HTML editor tabIndex setting (#1485972)
	- Added 'imap_debug' and 'smtp_debug' options
	- Support strftime's format modifiers in date_* options (#1484806)
	- Support %h variable in 'smtp_server' option (#1485766)
	- Show SMTP errors in browser (#1485927)
	- Allow WBR tag in HTML message (#1485960)
	- Use spl_autoload_register() instead of __autoload (#1485947)
	- Add hook for identities listing (#1485958)
	- Trigger hook 'smtp_connect' when opening an SMTP connection (#1485954)
	- Added config option to enforce HTTPS connections
	- Fix non-unicode characters caching in unicode database (#1484608)
	- Performance improvements of messages caching
	- Fix empty Date header issue (#1485923)
	- Open collapsed folders during drag & drop (#1485914)
	- Fixed link text replacements (#1485789)
	- Also trigger 'insertrow' events on page load (#1485826)
	- No link on subject in IE browsers (#1484913)
	- Fixed filename encoding according to RFC2231 (#1485875)
	- Added message Edit feature (#1483891, #1484440)
	- Fix message Etag generation for counter issues (#1485623)
	- Fix messages searching on MailEnable IMAP (#1485762)
	- Fixed many 'skip_deleted' issues (#1485634)
	- Fixed messages list sorting on servers without SORT capability
	- Colorized signatures in plain text messages
	- Reviewed/fixed skip_deleted/read_when_deleted/flag_for_deletion options handling in UI
	- Fix displaying of big maximum upload filesize (#1485889)
	- Added possibility to invert messages selection
	- After move/delete from 'show' action display next message instead of messages list (#1485887)
	- Fixed problem with double quote at the end of folder name (#1485884)
	- Speedup UI by using CSS sprites and etags/expires/deflate in Apache config (#1484858,#1485800)
	- Support UID EXPUNGE: remove only moved/deleted messages
	- Add drag cancelling with ESC key (#1484344)
	- Support initial identity name from virtuser_query (#1484003)
	- Added message menu, removed Print and Source buttons
	- Added possibility to save message as .eml file (#1485861)
	- Added 1 minute interval in autosave options (#1485854)
	- Support UTF-7 encoding in messages (#1485832)
	- Better support for malformed character names (#1485758)

	RELEASE 0.3-BETA
	----------------
	- Plugin API + jQuery engine
	- Added possibility to encrypt received header, option 'http_received_header_encrypt',
	added some more logic in encrypt/decrypt functions for security
	- Fix Answered/Forwarded flag setting for messages in subfolders
	- Fix autocomplete problem with capital letters (#1485792)
	- Support UUencode content encoding (#1485839)
	- Minimize chance of race condition in session handling (#1485659, #1484678)
	- Fix session handling on non-session SQL query error (#1485734)
	- Fix html editor mode setting when reopening draft message (#1485834)
	- Added quick search box menu (#1484304)
	- Fix wrong column sort order icons (#1485823)
	- Updated TinyMCE to 3.2.3 version
	- Fix attachment names encoding when charset isn't specified in attachment part (#1484969)
	- Fix message normal priority problem (#1485820)
	- Fix autocomplete spinning wheel does not disappear (#1485804)
	- Added log_date_format option (#1485709)
	- Fix text wrapping in HTML editor after switching from plain text to HTML (#1485521)
	- Fix auto-complete function hangs with plus sign (#1485815)
	- Fix AJAX requests errors handler (#1485000)
	- Speed up message list displaying on IE
	- Fix read/write database recognition (#1485811)

	RELEASE 0.2.2
	-------------
	- Fix quicksearchbox look in Chrome and Konqueror (#1484841)
	- Fix UTF-8 byte-order mark removing (#1485514)
	- Fix folders subscribtions on Konqueror (#1484841)
	- Fix debug console on Konqueror and Safari
	- Fix messagelist focus issue when modifying status of selected messages (#1485807)
	- Support STARTTLS in IMAP connection (#1485284)
	- Fix DEL key problem in search boxes (#1485528)
	- Support several e-mail addresses per user from virtuser_file (#1485678)
	- Fix drag&drop with scrolling on IE (#1485786)
	- Fix adding signature separator in html mode (#1485350)
	- Fix opening attachment marks message as read (#1485803)
	- Fix 'temp_dir' does not support relative path under Windows (#1484529)
	- Fix "Initialize Database" button missing from installer (#1485802)
	- Fix compose window doesn't fit 1024x768 window (#1485396)
	- Fix service not available error when pressing back from compose dialog (#1485552)
	- Fix using mail() on Windows (#1485779)
	- Fix word wrapping in message-part's <PRE>s for printing (#1485787)
	- Fix incorrect word wrapping in outgoing plaintext multibyte messages (#1485714)
	- Fix double footer in HTML message with embedded images
	- Fix TNEF implementation bug (#1485773)
	- Fix incorrect row id parsing for LDAP contacts list (#1485784)
	- Fix 'mode' parameter in sqlite DSN (#1485772)

	RELEASE 0.2.1
	------------------
	- Use US-ASCII as failover when Unicode searching fails (#1485762)
	- Fix errors handling in IMAP command continuations (#1485762)
	- Fix FETCH result parsing for servers returning flags at the end of result (#1485763)
	- Fix datetime columns defaults in mysql's DDL (#1485641)
	- Fix attaching more than nine inline images (#1485759)
	- Support 'UNICODE-1-1-UTF-7' alias for UTF-7 encoding (#1485758)
	- Fix mime-type detection using a hard-coded map (#1485311)
	- Don't return empty string if charset conversion failed (#1485757)
	- Disable concurrent autocomplete query results display (#1485743)
	- Fix new lines stripped from message footer (#1485751)
	- Fix IE problem with mouse click autocomplete (#1485739)
	- Fix html body washing on reply/forward + fix attachments handling (#1485676)
	- Fix multiple recipients input parsing (#1485733)
	- Fix replying to message with html attachment (#1485676)
	- Use default_charset for messages without specified charset (#1485661, #1484961)
	- Support non-standard "GMT-XXXX" literal in date header (#1485729)
	- Added TNEF support to decode MS Outlook attachments (winmail.dat)
	- Fix "value continuation" MIME headers by adding required semicolon (#1485727)
	- Fix pressing select all/unread multiple times (#1485723)
	- Fix selecting all unread does not honor new messages (#1485724)
	- Fix some base64 encoded attachments handling (#1485725)
	- Support NGINX as IMAP backend: better BAD response handling (#1485720)
	- Performance fix: don't fetch attachment parts headers twice to parse filename
	- Fix checking for recent messages on various IMAP servers (#1485702)
	- Performance fix: Don't fetch quota and recent messages in "message view" mode
	- Fix displaying of alternative-inside-alternative messages (#1485713)
	- Fix MDNSent flag checking, use arbitrary keywords (asterisk) flag (#1485706)
	- Fix creation of folders with '&' sign in name
	- Fix parsing of email addresses without angle brackets (#1485693)
	- Save spellcheck corrections when switching from plain to html editor (and spellchecking is on)
	- Fix large search results on server without SORT capability (#1485668)
	- Get rid of preg_replace() with eval modifier and create_function usage (#1485686)
	- Bring back <base> and <link> tags in HTML messages
	- Fix XSS vulnerability through background attributes as reported by Julien Cayssol
	- Fix problems with backslash as IMAP hierarchy delimiter (#1484467)
	- Secure vcard export by getting rid of preg's 'e' modifier use (#1485689)
	- Fix authentication when submitting form with existing session (#1485679)
	- Allow absolute URLs to images in HTML messages/sigs (#1485666)
	- Fix message body which contains both inline attachments and emotions
	- Fix SQL query execution errors handling in rcube_mdb2 class (#1485509)
	- Fix address names with '@' sign handling (#1485654)
	- Improve messages display performance
	- Fix messages searching with 'to:' modifier

	RELEASE 0.2-STABLE
	------------------
	- Fix mark popup in IE 7 (#1485369)
	- Fix line-break issue when copy & paste in Firefox (#1485425)
	- Fix autocomplete "unknown server error" (#1485637)
	- Fix STARTTLS before AUTH in SMTP connection (#1484883)
	- Support multiple quota values in QUOTAROOT resonse (#1485626)
	- Only abbreviate file name for IE < 7 browsers (#1485063)
	- Performance: allow setting imap rootdir and delimiter before connect (#1485172)
	- Fix sorting of folders with more than 2 levels (#1485569)
	- Fix search results page jumps in LDAP addressbook (#1485253)
	- Fix empty line before the signature in IE (#1485351)
	- Fix horizontal scrollbar in preview pane on IE (#1484633)
	- Add Robots meta tag in login page and installer (#1484846)
	- Added 'show_images' option, removed 'addrbook_show_images' (#1485597)
	- Option to check for new mails in all folders (#1484374)
	- Don't set client busy when checking for new messages (#1485276)
	- Allow UTF-8 folder names in config (#1485579)
	- Add junk_mbox option configuration in installer (#1485579)
	- Do serverside addressbook queries for autocompletion (#1485531)
	- Allow setting attachment col position in 'list_cols' option
	- Allow override 'list_cols' via skin (#1485577)
	- Fix 'cache' table cleanup on session destroy (#1485516)
	- Increase speed of session destroy and garbage clean up
	- Fix session timeout when DB server got clock skew (#1485490)
	- Fix handling of some malformed messages (#1484438)
	- Speed up raw message body handling
	- Better HTML entities conversion in html2text (#1485519)
	- Fix big memory consumption and speed up searching on servers without SORT capability
	- Fix setting locale to tr_TR, ku and az_AZ (#1485470)
	- Use SORT for searching on servers with SORT capability
	- Added message status filter
	- Fix empty file sending (#1485389)
	- Improved searching with many criterias (calling one SEARCH command)
	- Fix HTML editor initialization on IE (#1485304)
	- Add warning when switching editor mode from html to plain (#1485488)
	- Make identities list scrollable (#1485538)
	- Fix problem with numeric folder names (#1485527)
	- Added BYE response simple support to prevent from endless loops in imap.inc (#1483956)
	- Fix unread message unintentionally marked as read if read_when_deleted=true (#1485409)
	- Remove port number from SERVER_NAME in smtp_helo_host (#1485518)
	- Don't send disposition notification receipts for messages marked as 'read' (#1485523)
	- Added 'keep_alive' and 'min_keep_alive' options (#1485360)
	- Added option 'identities_level', removed 'multiple_identities'
	- Allow deleting identities when multiple_identities=false (#1485435)
	- Added option focus_on_new_message (#1485374)
	- Fix html2text class autoloading on Windows (#1485505)
	- Fix html signature formatting when identity save error occured (#1485426)
	- Add feedback and set busy when moving folder (#1485497)
	- Fix 'Empty' link visibility for some languages e.g. Slovak (#1485489)
	- Fix messages count bar overlapping (#1485270)
	- Fix adding signature in drafts compose mode (#1485484)
	- Fix iil_C_Sort() to support very long and/or divided responses (#1485283)
	- Fix matching case sensitivity when setting identity on reply (#1485480)
	- Prefer default identity on reply
	- Fix imap searching on ISMail server (#1485466)
	- Add css class for flagged messages (#1485464)
	- Write username instead of id in sendmail log (#1485477)
	- Fix htmlspecialchars() use for PHP version < 5.2.3 (#1485475)
	- Fix js keywords escaping in json_serialize() for IE/Opera (#1485472)
	- Added bin/killcache.php script (#1485434)
	- Add support for SJIS, GB2312, BIG5 in rc_detect_encoding()
	- Fix vCard file encoding detection for non-UTF-8 strings (#1485410)
	- Add 'skip_deleted' option in User Preferences (#1485445)
	- Minimize "inline" javascript scripts use (#1485433)
	- Fix css class setting for folders with names matching defined classes names (#1485355)
	- Fix race conditions when changing mailbox
	- Fix spellchecking when switching to html editor (#1485362)
	- Fix compose window width/height (#1485396)
	- Allow calling msgimport.sh/msgexport.sh from any directory (#1485431)
	- Localized filesize units (#1485340)
	- Better handling of "no identity" and "no email in identity" situations (#1485117)
	- Added 'mime_param_folding' option with possibility to choose long/non-ascii attachment names encoding eg. to be readable in MS Outlook/OE (#1485320)
	- Added "advanced options" feature in User Preferences
	- Fix unread counter when displaying cached massage in preview panel (#1485290)
	- Fix htmleditor spellchecking on MS Windows (#1485397)
	- Fix problem with non-ascii attachment names in Mail_mime (#1485267, #1485096)
	- Fix language autodetection (#1485401)
	- Fix button label in folders management (#1485405)
	- Fix collapsed folder not indicating unread msgs count of all subfolders (#1485403)
	- Fix handling of apostrophes in filenames decoded according to rfc2231

	RELEASE 0.2-BETA
	----------------
	- Made config files location configurable (#1485215)
	- Reduced memory footprint when forwarding attachments (#1485345)
	- Allow and use spellcheck attribute for input/textarea fields (#1485060)
	- Added icons for forwarded/forwarded+replied messages (#1485257)
	- Added Reply-To to forwarded emails (#1485315)
	- Display progress message for folders create/delete/rename (#1485357)
	- Smart Tags and NOBR tag support in html messages (#1485363, #1485327)
	- Redesign of the identities settings (#1484042)
	- Add config option to disable creation/deletion of identities (#1484498)
	- Added 'sendmail_delay' option to restrict messages sending interval (#1484491)
	- Added vertical splitter for folders list resizing
	- Added possibility to view all headers in message view
	- Fixed splitter drag/resize on Opera (#1485170)
	- Fixed quota img height/width setting from template (#1484857)
	- Refactor drag & drop functionality. Don't rely on browser events anymore (#1484453)
	- Insert "virtual" folders in subscription list (#1484779)
	- Added link to open message in new window
	- Enable export of address book contacts as vCard
	- Add feature to import contacts from vcard files (#1326103)
	- Respect Content-Location headers in multipart/related messages according to RFC2110 (#1484946)
	- Allowed max. attachment size now indicated in compose screen (#1485030)
	- Also capture backspace key in list mode (#1484566)
	- Allow application/pgp parts to be displayed (#1484753)
	- Correctly handle options in mailto-links (#1485228)
	- Immediately save sort_col/sort_order in user prefs (#1485265)
	- Truncate very long (above 50 characters) attachment filenames when displaying
	- Allow to auto-detect client language if none set (#1484434)
	- Auto-detect the client timezone (user configurable)
	- Add RFC2231 header value continuations support for attachment filenames + hack for servers that not support that feature
	- Fix Reply-To header displaying (#1485314)
	- Mark form buttons that provide the most obvious operation (mainaction)
	- Added option 'quota_zero_as_unlimited' (#1484604)
	- Added PRE handling in html2text class (#1484740)
	- Added folder hierarchy collapsing
	- Added options to use syslog instead of log file (#1484850)
	- Added Logging & Debugging section in Installer
	- Fix In-Reply-To and References headers when composing saved draft message (#1485288)
	- Fix html message charset conversion for charsets with underline (#1485287)
	- Fix buttons status after contacts deletion (#1485233)
	- Fix escaping of To: and From: fields when building message body for reply or forward in the HTML editor (#1484904)
	- Use current mailbox name in template (#1485256)
	- Better fix for skipping untagged responses (#1485261)
	- Added pspell support patch by Kris Steinhoff (#1483960)
	- Enable spellchecker for HTML editor (#1485114)
	- Respect spellcheck_uri in tinyMCE spellchecker (#1484196)
	- Case insensitive contacts searching using PostgreSQL (#1485259)
	- Make default imap folders configurable for each user (#1485075)
	- Save outgoing mail to selectable folder (#1324581)
	- Fix hiding of mark menu when clicking th button again (#1484944)
	- Use long date format in print mode (#1485191)
	- Updated TinyMCE to version 3.1.0.1
	- Re-enable autocomplete attribute for login form (#1485211)
	- Check PERMANENTFLAGS before saving $MDNSent flag (#1484963, #1485163)
	- Added flag column on messages list (#1484623)
	- Patched Mail/MimePart.php (http://pear.php.net/bugs/bug.php?id=14232)
	- Allow trash/junk subfolders to be purged (#1485085)
	- Store compose parameters in session and redirect to a unique URL
	- Fixed CRAM-MD5 authentication (#1484819)
	- Fixed forwarding messages with one HTML attachment (#1484442)
	- Fixed encoding of message/rfc822 attachments and image/pjpeg handling (#1484914)
	- Added option to select skin in user preferences
	- Added option to configure displaying of attached images below the message body
	- Added option to display images in messages from known senders (#1484601)
	- User preferences grouped in more fieldsets
	- Fix corrupted MIME headers of messages in Sent folder (#1485111)
	- Fixed bug in MDB2 package: http://pear.php.net/bugs/bug.php?id=14124
	- Use keypress instead of keydown to select list's row (#1484816)
	- Don't call expunge and don't remove message row after message move if flag_for_deletion is set to true (#1485002)

	RELEASE 0.2-ALPHA
	-----------------
	- Added option to disable autocompletion from selected LDAP address books (#1484922)
	- TLS support in LDAP connections: 'use_tls' property (#1485104)
	- Fixed removing messages from search set after deleting them (#1485106)
	- imap.inc: Fixed iil_C_FetchStructureString() to handle many
	literal strings in response (#1484969)
	- Support for subfolders in default/protected folders (#1484665)
	- Disallowed delimiter in folder name (#1484803)
	- Support " and \ in folder names
	- Escape \ in login (#1484614)
	- Better HTML sanitization with the DOM-based washtml script (#1484701)
	- Fixed sorting of folders with non-ascii characters
	- Fixed Mysql DDL for default identities creation (#1485070)
	- In Preferences added possibility to configure 'read_when_deleted',
	'mdn_requests', 'flag_for_deletion' options
	- Made IMAP auth type configurable (#1483825)
	- Fixed empty values with FROM_UNIXTIME() in rcube_mdb2 (#1485055)
	- Fixed attachment list on IE 6/7 (#1484807)
	- Fixed JavaScript in compose.html that shows cc/bcc fields if populated
	- Make password input fields of type password in installer (#1484886)
	- Don't attempt to delete cache entries if enable_caching is FALSE (#1485051)
	- Optimized messages sorting on servers without sort capability (#1485049)
	- Corrected message headers decoding when charset isn't specified and improved
	support for native languages (#1485050, #1485048)
	- Expanded LDAP configuration options to support LDAP server writes.
	- Installer: encode special characters in DB username/password (#1485042)
	- Fixed management of folders with national characters in names (#1485036, #1485001)
	- Fixed identities saving when using MDB2 pgsql driver (#1485032)
	- Fixed BCC header reset (#1484997)
	- Improved messages list performance - patch from Justin Heesemann
	- Append skin_path to images location only when it starts with '/' sign (#1484859)
	- Fix IMAP response in message body when message has no body (#1484964)
	- Fixed non-RFC dates formatting (#1484901)
	- Fixed typo in set_charset() (#1484991)
	- Decode entities when inserting HTML signature to plain text message (#1484990)
	- HTML editing is now working with PHP5 updates and TinyMCE v3.0.6
	- Fixed signature loading on Windows (#1484545)
	- Added language support to HTML editing (#1484862)
	- Fixed remove signature when replying (#1333167)
	- Fixed problem with line with a space at the end (#1484916)
	- Fixed <!DOCTYPE> tag filtering (#1484391)
	- Fixed <?xml> tag filtering (#1484403)
	- Added sections (fieldset+label) in Settings interface
	- Mark as read in one action with message preview (#1484972)
	- Deleted redundant quota reads (#1484972)
	- Added options for empty trash and expunge inbox on logout (#1483863)
	- Removed lines wrapping when displaying message
	- Fixed month localization
	- Changed codebase to PHP5 with autoloader

	RELEASE 0.1.1
	-------------
	- Clear selection when selecting single item (#1484942)
	- Remove hard-coded image size in skin templates (#1484893)
	- Database schema improvements (dropped unnecessary indexes)
	- Fixed creating a new folder with a comma in its name (#1484681)
	- Fixed sorting of messages when default mailbox is empty (#1484317)
	- Improve message previewpane - less loading (#1484316)
	- Fixed login form autoompletion (#1484839)
	- Fixed virtuser_query option for mdb2 backend (#1484874)
	- Fixed attachment resoting from Drafts when message body was empty (#1484506)
	- Fixed usage of ob_gzhandler (#1484851)
	- Fixed message part window in IE6 (#1484610)
	- Fixed decoding of mime-encoded strings (#1484191)
	- Fixed some iconv/mb_string problems (#1484598)
	- Correctly quote mailbox name when using in URL (#1484313)
	- Fixed "headers already sent" errors (#1484860)

	RELEASE 0.1-STABLE
	------------------
	- Added interactive installer script
	- Fix folder adding/renaming inspired by #1484800
	- Localize folder name in page title (#1484785)
	- Fix code using wrong variable name (#1484018)
	- Allow to send mail with BCC recipients only
	- condense TinyMCE toolbar down to one line, removing table buttons (#1484747)
	- Add function to mark the selected messages as read/unread (#1457360)
	- Also do charset decoding as suggested in RFC 2231 (fix #1484321)
	- Show message count in folder list and hint when creating a subfolder
	- Distinguish ssl and tls for imap connections (#1484667)
	- Added some charset aliases to fix typical mis-labelling (#1484565)
	- Remember decision to display images for a certain message during session (#1484754)
	- Truncate attachment filenames to 55 characters due to an IE bug (#1484757)
	- Make sending of read receipts configurable
	- Respect config when localize folder names (#1484707)
	- Also respect receipt and priority settings when re-opening a draft message
	- Remember search results (closes #1483883), patch by the_glu
	- Add Received header on outgoing mail
	- Upgrade to TinyMCE 2.1.3
	- Allow inserting image attachments into HTML messages while composing (#1484557)
	- Implement Message-Disposition-Notification (Receipts)
	- Fix overriding of session vars when register_globals is on (#1484670)
	- Fix bug with case-sensitive folder names (#1484245)
	- Don't create default folders by default
	- Fixed some potential security risks (audited by Andris)
	- Only show new messages if they match the current search (#1484176)
	- Switch to/from when searcing in Sent folder (#1484555)
	- Correctly read the References header (#1484646)
	- Unset old cookie before sending a new value (#1484639)
	- Correctly decode attachments when downloading them (#1484645 and #1484642)
	- Suppress IE errors when clearing attachments form (#1484356)
	- Log error when login fails due to auto_create_user turned off
	- Filter linked/imported CSS files (closes #1484056)
	- Improve message compose screen (closes #1484383)
	- Select next row after removing one from list (#1484387)

	RELEASE 0.1-RC2
	---------------
	- Enable drag-&-dropping of folders to a new parent and allow to create subfolders (#1457344)
	- Suppress IE errors when clearing attachments form (#1484356)
	- Set preferences field in user table to NULL (#1484386)
	- Log error when login fails due to auto_create_user turned off
	- Filter linked/imported CSS files (closes #1484056)
	- Improve message compose screen (closes #1484383)
	- Select next row after removing one from list (#1484387)
	- Make smtp HELO/EHLO hostname configurable (#1484067)
	- IPv6 Compatability (#1484322), Patch #1484373
	- Unlock interface when message sending fails (#1484570)
	- Eval PHP code in template includes (if configured)
	- Show message when folder is empty. Mo more static text in table (#1484395)
	- Only display unread count in page title when new messages arrived
	- Fixed wrong delete button tooltip (#1483965)
	- Fixed charset encoding bug (#1484429)
	- Applied patch for LDAP version (#1484552)
	- Improved XHTML validation
	- Fix message list selection (#1484550)
	- Better fix lowercased usernames (#1484473)
	- Update pngbehavior Script as suggested in #1484490
	- Fixed moving/deleting messages when more than 1 is selected
	- Applied patch for LDAP contacts listing by Glen Ogilvie
	- Applied patch for more address fields in LDAP contacts (#1484402)
	- Add alternative for getallheaders() (fix #1484508)
	- Identify mailboxes case-sensitive
	- Sort mailbox list case-insensitive (closes #1484338)
	- Fix display of multipart messages from Apple Mail (closes #1484027)
	- Protect AJAX request from being fetched by a foreign site (XSS)
	- Make autocomplete for loginform configurable by the skin template
	- Fix compose function from address book (closes #1484426)
	- Added //IGNORE to iconv call (patch #1484420, closes #1484023)
	- Check if mbstring supports charset (#1484290 and #1484292)
	- Prefer iconv over mbstring (as suggested in #1484292)
	- Check filesize of template includes (#1484409)
	- Fixed bug with buttons not dimming/enabling properly after switching folders
	- Fixed compose window becoming unresponsive after saving a draft (#1484487)
	- Re-enabled "Back" button in compose window now that bug #1484487 is fixed
	- Fixed unresponsive interface issue when downloading attachments (#1484496)
	- Lowered status message time from 5 to 3 seconds to improve responsiveness
	- Raised .htaccess upload_max_filesize from 2M to 5M to differ from default php.ini
	- Increased "mailboxcontrols" mail.css width from 160 to 170px to fix non-english languages (#1484499)
	- Fix status message bug #1484464 with regard to #1484353
	- Fix address adding bug reported by David Koblas
	- Applied socket error patch by Thomas Mangin
	- Pass-by-reference workarround for PHP5 in sendmail.inc
	- Fixed buggy imap_root settings (closes #1484379)
	- Prevent default events on subject links (#1484399)
	- Use HTTP-POST requests for actions that change state

	RELEASE 0.1-RC1
	---------------
	- Use global filters and bind username/ for Ldap searches (#1484159)
	- Hide quota display if imap server does not support it
	- Hide address groups if no LDAP servers configured
	- Add link to message subjects (closes #1484257)
	- Better SQL query for contact listing/search (closes #1484369)
	- Fixed marking as read in preview pane (closes #1484364)
	- CSS hack to display attachments correctly in IE6
	- Wrap message body text (closes #1484148)
	- LDAP access is back in address book (closes #1484087)
	- Added search function for contacts
	- New Template parsing and output encoding
	- Fixed bugs #1484119 and #1483978
	- Fixed message moving procedure (closes #1484308)
	- Fixed display of multiple attachments (closes #1466563)
	- Fixed check for new messages (closes #1484310)
	- List attachments without filename
	- New session authentication: Change sessid cookie when login, authentication with sessauth cookie is now configurable.
	Should close bugs #1483951 and #1484299
	- Correctly translate mailbox names (closes #1484276)
	- Quote e-mail address links (closes #1484300)
	- Updated PEAR::Mail_mime package
	- Accept single quotes for HTML attributes when modifying message body (thanks Jason)
	- Sanitize input for new users/identities (thanks Colin Alston)
	- Don't download HTML message parts
	- Convert HTML parts to plaintext if 'prefer_html' is off
	- Correctly parse message/rfc822 parts (closes #1484045)
	- Also use user_id for unique key in messages table (closes #1484074)
	- Hide contacts drop down on blur (closes #1484203)
	- Make entries in contacts drop down clickable
	- Turn off browser autocompletion on login page
	- Quote <? in text/html message parts
	- Hide border around radio buttons
	- Applied patch for attachment download by crichardson (closes #1484198)
	- Fixed bug in Postgres DB handling (closes #1484068)
	- Fixed bug of invalid calls to fetchRow() in rcube_db.inc (closes #1484280)
	- Fixed array_merge bug (closes #1484281)
	- Fixed flag for deletion in list view (closes #1484264)
	- Finally support semicolons as recipient separator (closes ##1484251)
	- Fixed message headers (subject) encoding
	- check if safe mode is on or not (closes #1484269)
	- Show "no subject" in message list if subject is missing (closes #1484243)
	- Solved page caching of message preview (closes #1484153)
	- Only use gzip compression if configured (closes #1484236)
	- Fixed priority selector issue (#1484150)
	- Fixed some CSS issues in default skin (closes #1484210 and #1484161)
	- Prevent from double quoting of numeric HTML character references (closes #1484253)
	- Fixed display of HTML message attachments (closes #1484178)
	- Applied patch for preview caching (closes #1484186)
	- Added error handling for attachment uploads
	- Use multibyte safe string functions where necessary (closes #1483988)
	- Applied security patch to validate the submitted host value (by Kees Cook)
	- Applied security patch to validate input values when deleting contacts (by Kees Cook)
	- Applied security patch that sanitizes emoticon paths when attaching them (by Kees Cook)
	- Applied a patch to more aggressively sanitize a HTML message
	- Visualize blocked images in HTML messages
	- Fixed wrong message listing when showing search results (closes #1484131)
	- Show remote images when opening HTML message part as attachment
	- Improve memory usage when sending mail (closes #1484098)
	- Mark messages as read once the preview is loaded (closes #1484132)
	- Include smtp final response in log (closes #1484081)
	- Corrected date string in sent message header (closes #1484125)
	- Correclty choose "To" column in sent and draft mailboxes (closes #1483943)
	- Changed srong tooltips for message browse buttons (closes #1483930)
	- Fixed signature delimeter character to be standard (Bug #1484035)
	- Fixed XSS vulnerability (Bug #1484109)
	- Remove newlines from mail headers (Bug #1484031)
	- Selection issues when moving/deleting (Bug #1484044)
	- Applied patch of Clement Moulin for imap host auto-selection
	- ISO-encode IMAP password for plaintext login (Bugs #1483977 & #1483886)
	- Fixed folder name encoding in subscription list (Bug #1484113)
	- Fixed JS errors in identity list (Bug #1484120)
	- Translate foldernames in folder form (closes #1484113)
	- Added first and last buttons to message list, address book
	and message detail
	- Pressing Shift-Del bypasses Trash folder
	- Enable purge command for Junk folder
	- Fetch all aliases if virtuser_query is used instead
	- Re-enabled multi select of contacts (Bug #1484017)
	- Enable contact editing right after creation (Bug #1459641)
	- Correct UTF-7 to UTF-8 conversion if mbstring is not available
	- Fixed IMAP fetch of message body (Bug #1484019)
	- Fixed safe_mode problems (Bug #1418381)
	- Fixed wrong header encoding (Bug #1483976)
	- Made automatic draft saving configurable
	- Fixed JS bug when renaming folders (Bug #1483989)
	- Added quota display as image (by Brett Patterson)
	- Corrected creation of a message-id
	- New indentation for quoted message text
	- Improved HTML validity
	- Fixed URL character set (Ticket #1445501)
	- Fixed saving of contact into MySQL from LDAP query results (Ticket #1483820)
	- Fixed folder renaming: unsubscribe before rename (Bug #1483920)
	- Finalized new message parsing (+ chaching)
	- Fixed wrong usage of mbstring (Bug #1462439)
	- Set default spelling language (Ticket #1483938)
	- Added support for Nox Spell Server
	- Re-built message parsing (Bug #1327068)
	Now based on the message structure delivered by the IMAP server.
	- Fixed some XSS and SQL injection issues
	- Fixed charset problems with folder renaming
	diff --git a/program/lib/Roundcube/rcube_imap.php b/program/lib/Roundcube/rcube_imap.php
	index 18c6b12af..8d9c37576 100644
	--- a/program/lib/Roundcube/rcube_imap.php
	+++ b/program/lib/Roundcube/rcube_imap.php
	@@ -1,4189 +1,4186 @@
	<?php

	/*
	+-----------------------------------------------------------------------+
	\| 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 Storage Engine \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	\| Author: Aleksander Machniak <alec@alec.pl> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Interface class for accessing an IMAP server
	*
	* @package Framework
	* @subpackage Storage
	* @author Thomas Bruederli <roundcube@gmail.com>
	* @author Aleksander Machniak <alec@alec.pl>
	*/
	class rcube_imap extends rcube_storage
	{
	/**
	* 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.
	*/
	public function __construct()
	{
	$this->conn = new rcube_imap_generic();

	// Set namespace and delimiter from session,
	// so some methods would work before connection
	if (isset($_SESSION['imap_namespace'])) {
	$this->namespace = $_SESSION['imap_namespace'];
	}
	if (isset($_SESSION['imap_delimiter'])) {
	$this->delimiter = $_SESSION['imap_delimiter'];
	}
	}


	/**
	* Magic getter for backward compat.
	*
	* @deprecated.
	*/
	public function __get($name)
	{
	if (isset($this->{$name})) {
	return $this->{$name};
	}
	}


	/**
	* 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, $use_ssl=null)
	{
	// check for OpenSSL support in PHP build
	if ($use_ssl && extension_loaded('openssl')) {
	$this->options['ssl_mode'] = $use_ssl == 'imaps' ? 'ssl' : $use_ssl;
	}
	else if ($use_ssl) {
	rcube::raise_error(array('code' => 403, 'type' => 'imap',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "OpenSSL not available"), true, false);
	$port = 143;
	}

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

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

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

	$attempt = 0;
	do {
	$data = rcube::get_instance()->plugins->exec_hook('storage_connect',
	array_merge($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, rcube_utils::remote_ip(), $this->conn->error);

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

	return false;
	}


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


	/**
	* Check connection state, connect if not connected.
	*
	* @return bool Connection state.
	*/
	public function check_connection()
	{
	// 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']
	);
	}

	return $this->is_connected();
	}


	/**
	* Checks IMAP connection.
	*
	* @return boolean TRUE on success, FALSE on failure
	*/
	public function is_connected()
	{
	return $this->conn->connected();
	}


	/**
	* Returns code of last error
	*
	* @return int Error code
	*/
	public function get_error_code()
	{
	return $this->conn->errornum;
	}


	/**
	* Returns text of last error
	*
	* @return string Error string
	*/
	public function get_error_str()
	{
	return $this->conn->error;
	}


	/**
	* Returns code of last command response
	*
	* @return int Response code
	*/
	public function get_response_code()
	{
	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;
	}
	}


	/**
	* Activate/deactivate debug mode
	*
	* @param boolean $dbg True if IMAP conversation should be logged
	*/
	public function set_debug($dbg = true)
	{
	$this->options['debug'] = $dbg;
	$this->conn->setDebug($dbg, array($this, 'debug_handler'));
	}


	/**
	* Set internal folder reference.
	* All operations will be perfomed on this folder.
	*
	* @param string $folder Folder name
	*/
	public function set_folder($folder)
	{
	if ($this->folder == $folder) {
	return;
	}

	$this->folder = $folder;

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


	/**
	* 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)
	{
	$set = (array)$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');
	}


	/**
	* Return the saved search set as hash array
	*
	* @return array Search set
	*/
	public function get_search_set()
	{
	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 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)
	{
	$cap = strtoupper($cap);
	$sess_key = "STORAGE_$cap";

	if (!isset($_SESSION[$sess_key])) {
	if (!$this->check_connection()) {
	return false;
	}

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

	return $_SESSION[$sess_key];
	}


	/**
	* 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)
	{
	$flag = strtoupper($flag);
	$imap_flag = $this->conn->flags[$flag];
	$perm_flags = $this->get_permflags($this->folder);

	return in_array_nocase($imap_flag, $perm_flags);
	}


	/**
	* Returns PERMANENTFLAGS of the specified folder
	*
	* @param string $folder Folder name
	*
	* @return array Flags
	*/
	public function get_permflags($folder)
	{
	if (!strlen($folder)) {
	return array();
	}
	/*
	Checking PERMANENTFLAGS is rather rare, so we disable caching of it
	Re-think when we'll use it for more than only MDNSENT flag

	$cache_key = 'mailboxes.permanentflags.' . $folder;
	$permflags = $this->get_cache($cache_key);

	if ($permflags !== null) {
	return explode(' ', $permflags);
	}
	*/
	if (!$this->check_connection()) {
	return array();
	}

	if ($this->conn->select($folder)) {
	$permflags = $this->conn->data['PERMANENTFLAGS'];
	}
	else {
	return array();
	}

	if (!is_array($permflags)) {
	$permflags = array();
	}
	/*
	// Store permflags as string to limit cached object size
	$this->update_cache($cache_key, implode(' ', $permflags));
	*/
	return $permflags;
	}


	/**
	* Returns the delimiter that is used by the IMAP server for folder separation
	*
	* @return string Delimiter string
	* @access public
	*/
	public function get_hierarchy_delimiter()
	{
	return $this->delimiter;
	}


	/**
	* Get namespace
	*
	* @param string $name Namespace array index: personal, other, shared, prefix
	*
	* @return array Namespace data
	*/
	public function get_namespace($name = null)
	{
	$ns = $this->namespace;

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

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


	/**
	* Sets delimiter and namespaces
	*/
	protected function set_env()
	{
	if ($this->delimiter !== null && $this->namespace !== null) {
	return;
	}

	$config = rcube::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');

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

	$ns = $this->conn->getNamespace();

	// Set namespaces (NAMESPACE supported)
	if (is_array($ns)) {
	$this->namespace = $ns;
	}
	else {
	$this->namespace = array(
	'personal' => NULL,
	'other' => NULL,
	'shared' => NULL,
	);
	}

	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 = '/';
	}

	// 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);
	}
	}
	}

	// 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];
	}

	$_SESSION['imap_namespace'] = $this->namespace;
	$_SESSION['imap_delimiter'] = $this->delimiter;
	}


	/**
	* Get message count for a specific folder
	*
	* @param string $folder Folder name
	* @param string $mode Mode for count [ALL\|THREADS\|UNSEEN\|RECENT\|EXISTS]
	* @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, $status=true)
	{
	if (!strlen($folder)) {
	$folder = $this->folder;
	}

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


	/**
	* protected method for getting nr of messages
	*
	* @param string $folder Folder name
	* @param string $mode Mode for count [ALL\|THREADS\|UNSEEN\|RECENT\|EXISTS]
	* @param boolean $force Force reading from server and update cache
	* @param boolean $status Enables storing folder status info (max UID/count),
	* required for folder_status()
	*
	* @return int Number of messages
	* @see rcube_imap::count()
	*/
	protected function countmessages($folder, $mode='ALL', $force=false, $status=true)
	{
	$mode = strtoupper($mode);

	// 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();
	}
	}

	// EXISTS is a special alias for ALL, it allows to get the number
	// of all messages in a folder also when search is active and with
	// any skip_deleted setting

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

	// return cached value
	if (!$force && is_array($a_folder_cache[$folder]) && isset($a_folder_cache[$folder][$mode])) {
	return $a_folder_cache[$folder][$mode];
	}

	if (!is_array($a_folder_cache[$folder])) {
	$a_folder_cache[$folder] = array();
	}

	if ($mode == 'THREADS') {
	$res = $this->fetch_threads($folder, $force);
	$count = $res->count();

	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 ($mode != 'EXISTS' && !empty($this->options['skip_deleted'])) {
	$search_str = "ALL UNDELETED";
	$keys = array('COUNT');

	if ($mode == 'UNSEEN') {
	$search_str .= " UNSEEN";
	}
	else {
	if ($this->messages_caching) {
	$keys[] = 'ALL';
	}
	if ($status) {
	$keys[] = 'MAX';
	}
	}

	// @TODO: if $force==false && $mode == 'ALL' we could try to use cache index here

	// 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();

	if ($mode == 'ALL') {
	// Cache index data, will be used in index_direct()
	$this->icache['undeleted_idx'] = $index;

	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 && $mode == 'ALL') {
	$this->set_folder_stats($folder, 'cnt', $count);
	$this->set_folder_stats($folder, 'maxuid', $count ? $this->id2uid($count, $folder) : 0);
	}
	}
	}

	$a_folder_cache[$folder][$mode] = (int)$count;

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

	return (int)$count;
	}


	/**
	* 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, $slice=0)
	{
	if (!strlen($folder)) {
	$folder = $this->folder;
	}

	return $this->_list_messages($folder, $page, $sort_field, $sort_order, $slice);
	}


	/**
	* 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();
	}

	$this->set_sort_order($sort_field, $sort_order);
	$page = $page ? $page : $this->list_page;

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

	if ($this->threading) {
	return $this->list_thread_messages($folder, $page, $slice);
	}

	// get UIDs of all messages in the folder, sorted
	$index = $this->index($folder, $this->sort_field, $this->sort_order);

	if ($index->is_empty()) {
	return array();
	}

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

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

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

	// 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 {
	$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_result_thread $threads Threads data object
	*
	* @return array Message headers array indexed by message UID
	*/
	protected function set_thread_flags(&$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 ($index->is_empty()) {
	return array();
	}

	// 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);

	$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
	$slice_length = min($this->page_size, $cnt - ($to > $cnt ? $from : $to));
	$a_msg_headers = array_slice(array_values($a_msg_headers), $from, $slice_length);

	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_message_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
	$this->countmessages($folder, 'ALL', true);

	$result = 0;

	if (empty($old)) {
	return $result;
	}

	$new = $this->get_folder_stats($folder);

	// 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;
	}


	/**
	* 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)
	{
	$_SESSION['folders'][$folder][$name] = $data;
	}


	/**
	* 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);
	}

	// 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);
	}

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

	return $index;
	}

	// 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);
	}

	return $index;
	}


	/**
	* 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, $skip_cache = true)
	{
	if (!$skip_cache && ($mcache = $this->get_mcache_engine())) {
	$index = $mcache->get_index($folder, $sort_field, $sort_order);
	}
	// use message index sort as default sorting
	else if (!$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' .($this->options['skip_deleted'] ? ' UNDELETED' : ''), true);
	}
	}
	else if (!$this->check_connection()) {
	return new rcube_result_index();
	}
	// fetch complete message index
	else {
	if ($this->get_capability('SORT')) {
	$index = $this->conn->sort($folder, $sort_field,
	$this->options['skip_deleted'] ? 'UNDELETED' : '', true);
	}

	if (empty($index) \|\| $index->is_error()) {
	$index = $this->conn->index($folder, "1:*", $sort_field,
	$this->options['skip_deleted'], false, true);
	}
	}

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

	return $index;
	}


	/**
	* 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, $sort_order=NULL)
	{
	if (!strlen($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;
	}


	/**
	* Sort threaded result, using THREAD=REFS method
	*
	* @param rcube_result_thread $threads Threads result set
	*/
	protected function sort_threads($threads)
	{
	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;
	}

	// unset CHARSET if criteria string is ASCII, this way
	// SEARCH won't be re-sent after "unsupported charset" response
	if ($charset && $charset != 'US-ASCII' && is_ascii($criteria)) {
	$charset = 'US-ASCII';
	}

	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 != 'US-ASCII' ? "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 $force True to skip cache
	*
	* @return rcube_message_header Message headers
	*/
	public function get_message_headers($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 $folder Folder to read from
	*
	* @return object rcube_message_header Message data
	*/
	public function get_message($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].'/'.$structure[1]) == 'text/plain'
	) {
	// A special known case "Content-type: text" (#1488968)
	if ($headers->ctype == 'text') {
	$structure[1] = 'plain';
	$headers->ctype = 'text/plain';
	}
	// we can handle single-part messages, by simple fix in structure (#1486898)
	else if (preg_match('/^(text\|application)\/(.*)/', $headers->ctype, $m)) {
	$structure[0] = $m[1];
	$structure[1] = $m[2];
	}
	else {
	// Try to parse the message using Mail_mimeDecode package
	// We need a better solution, Mail_mimeDecode parses message
	// in memory, which wouldn't work for very big messages,
	// (it uses up to 10x more memory than the message size)
	// it's also buggy and not actively developed
	if ($headers->size && rcube_utils::mem_check($headers->size * 10)) {
	$raw_msg = $this->get_raw_body($uid);
	$struct = rcube_mime::parse_message($raw_msg);
	}
	else {
	return $headers;
	}
	}
	}

	if (empty($struct)) {
	$struct = $this->structure_part($structure, 0, '', $headers);
	}

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

	// ...and charset (there's a case described in #1488968 where invalid content-type
	// results in invalid charset in BODYSTRUCTURE)
	if (!empty($headers->charset) && $headers->charset != $struct->ctype_parameters['charset']) {
	$struct->charset = $headers->charset;
	$struct->ctype_parameters['charset'] = $headers->charset;
	}
	}

	$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 {
	$charset = rcube_charset::detect($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
	* @param int $max_bytes Only read this number of bytes
	*
	* @return string Message/part body if not printed
	*/
	public function get_message_part($uid, $part=1, $o_part=NULL, $print=NULL, $fp=NULL, $skip_charset_conv=false, $max_bytes=0)
	{
	if (!$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, $o_part->ctype_primary == 'text', $max_bytes);
	}

	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
	*
	* @param int $uid Message UID
	* @param bool $formatted Enables line-ending formatting
	*/
	public function print_raw_body($uid, $formatted = true)
	{
	if (!$this->check_connection()) {
	return;
	}

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


	/**
	* 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 ($result && !$skip_cache) {
	// reload message headers if cached
	// update flags instead removing from cache
	if ($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' \|\| $flag == 'UNDELETED') {
	$this->clear_messagecount($folder, 'DELETED');
	// remove cached messages
	if ($this->options['skip_deleted']) {
	$this->clear_message_cache($folder, $all_mode ? null : explode(',', $uids));
	}
	}
	}

	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
	* @param array $flags Message flags
	* @param mixed $date Message internal date
	* @param bool $binary Enables BINARY append
	*
	* @return int\|bool Appended message UID or True on success, False on error
	*/
	public function save_message($folder, &$message, $headers='', $is_file=false, $flags = array(), $date = null, $binary = false)
	{
	if (!strlen($folder)) {
	$folder = $this->folder;
	}

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

	// make sure folder exists
	if (!$this->folder_exists($folder)) {
	return false;
	}

	$date = $this->date_format($date);

	if ($is_file) {
	$saved = $this->conn->appendFromFile($folder, $message, $headers, $flags, $date, $binary);
	}
	else {
	$saved = $this->conn->append($folder, $message, $flags, $date, $binary);
	}

	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 = rcube::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;
	}

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

	if (isset($data['folders'])) {
	$a_mboxes = $data['folders'];
	}
	else {
	$a_mboxes = $this->list_folders_subscribed_direct($root, $name);
	}

	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;
	}


	/**
	* Method for direct folders listing (LSUB)
	*
	* @param string $root Optional root folder
	* @param string $name Optional name pattern
	*
	* @return array List of subscribed folders
	* @see rcube_imap::list_folders_subscribed()
	*/
	public function list_folders_subscribed_direct($root='', $name='*')
	{
	if (!$this->check_connection()) {
	return null;
	}

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

	// Server supports LIST-EXTENDED, we can use selection options
	// #1486225: Some dovecot versions returns wrong result using LIST-EXTENDED
	$list_extended = !$config->get('imap_force_lsub') && $this->get_capability('LIST-EXTENDED');
	if ($list_extended) {
	// This will also set folder options, LSUB doesn't do that
	$a_folders = $this->conn->listMailboxes($root, $name,
	NULL, array('SUBSCRIBED'));
	}
	else {
	// retrieve list of folders from IMAP server using LSUB
	$a_folders = $this->conn->listSubscribed($root, $name);
	}

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

	// #1486796: some server configurations doesn't return folders in all namespaces
	if ($root == '' && $name == '*' && $config->get('imap_force_ns')) {
	$this->list_folders_update($a_folders, ($list_extended ? 'ext-' : '') . 'subscribed');
	}

	if ($list_extended) {
	// unsubscribe non-existent folders, remove from the list
	// we can do this only when LIST response is available
	if (is_array($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]);
	}
	}
	}
	}
	else {
	// 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]);
	}
	}
	}
	}
	}

	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 = rcube::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 = $this->list_folders_direct($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;
	}


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

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

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

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

	// #1486796: some server configurations doesn't return folders in all namespaces
	if ($root == '' && $name == '*' && $config->get('imap_force_ns')) {
	$this->list_folders_update($result);
	}

	return $result;
	}


	/**
	* Fix folders list by adding folders from other namespaces.
	* Needed on some servers eg. Courier IMAP
	*
	* @param array $result Reference to folders list
	* @param string $type Listing type (ext-subscribed, subscribed or all)
	*/
	private function list_folders_update(&$result, $type = null)
	{
	$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 $prefix) {
	if ($type == 'ext-subscribed') {
	$list = $this->conn->listMailboxes('', $prefix . '*', null, array('SUBSCRIBED'));
	}
	else if ($type == 'subscribed') {
	$list = $this->conn->listSubscribed('', $prefix . '*');
	}
	else {
	$list = $this->conn->listMailboxes('', $prefix . '*');
	}

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


	/**
	* 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;
	}


	/**
	* 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)
	{
	if (!$this->check_connection()) {
	return 0;
	}

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

	if (is_array($result)) {
	$result = array_sum($result);
	}

	return $result;
	}


	/**
	* Subscribe to a specific folder(s)
	*
	* @param array $folders Folder name(s)
	*
	* @return boolean True on success
	*/
	public function subscribe($folders)
	{
	// let this common function do the main work
	return $this->change_subscription($folders, 'subscribe');
	}


	/**
	* Unsubscribe folder(s)
	*
	* @param array $a_mboxes Folder name(s)
	*
	* @return boolean True on success
	*/
	public function unsubscribe($folders)
	{
	// let this common function do the main work
	return $this->change_subscription($folders, 'unsubscribe');
	}


	/**
	* 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, $subscribe=false)
	{
	if (!$this->check_connection()) {
	return false;
	}

	$result = $this->conn->createFolder($folder);

	// try to subscribe it
	if ($result) {
	// clear cache
	$this->clear_cache('mailboxes', true);

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

	return $result;
	}


	/**
	* 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, $new_name)
	{
	if (!strlen($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;
	}


	/**
	* Remove folder from server
	*
	* @param string $folder Folder name
	*
	* @return boolean True on success
	*/
	function delete_folder($folder)
	{
	$delm = $this->get_hierarchy_delimiter();

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

	// 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 = $this->conn->deleteFolder($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);
	}

	return $result;
	}


	/**
	* Create all folders specified as default
	*/
	public function create_default_folders()
	{
	// 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);
	}
	}
	}


	/**
	* 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, $subscription=false)
	{
	if ($folder == 'INBOX') {
	return true;
	}

	$key = $subscription ? 'subscribed' : 'existing';

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

	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'];
	}

	// get cached metadata
	$cache_key = 'mailboxes.folder-info.' . $folder;
	$cached = $this->get_cache($cache_key);

	if (is_array($cached)) {
	return $cached;
	}

	$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);
	$options['special'] = in_array($folder, $this->default_folders);

	// Set 'noselect' flag
	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;
	}

	// Get folder rights (MYRIGHTS)
	if ($acl && ($rights = $this->my_rights($folder))) {
	$options['rights'] = $rights;
	}

	// Set 'norename' flag
	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';
	}

	// update caches
	$this->icache['options'] = $options;
	$this->update_cache($cache_key, $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;
	}

	$this->clear_cache('mailboxes.folder-info.' . $folder);

	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;
	}

	$this->clear_cache('mailboxes.metadata.', true);

	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;
	}

	$this->clear_cache('mailboxes.metadata.', true);

	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())
	{
	$entries = (array)$entries;

	// create cache key
	// @TODO: this is the simplest solution, but we do the same with folders list
	// maybe we should store data per-entry and merge on request
	sort($options);
	sort($entries);
	$cache_key = 'mailboxes.metadata.' . $folder;
	$cache_key .= '.' . md5(serialize($options).serialize($entries));

	// get cached data
	$cached_data = $this->get_cache($cache_key);

	if (is_array($cached_data)) {
	return $cached_data;
	}

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

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

	// Convert entry names
	foreach ($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);
	}
	}
	}

	if (isset($res)) {
	$this->update_cache($cache_key, $res);
	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 $type Cache type (@see rcube::get_cache)
	*/
	public function set_caching($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) {
	$rcube = rcube::get_instance();
	$ttl = $rcube->config->get('message_cache_lifetime', '10d');
	$this->cache = $rcube->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 = rcube::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) {
	$rcube = rcube::get_instance();
	if (($dbh = $rcube->get_dbh()) && ($userid = $rcube->get_user_id())) {
	$this->mcache = new rcube_imap_cache(
	$dbh, $this, $userid, $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;
	}


	/**
	* Increde/decrese messagecount for a specific folder
	*/
	protected function set_messagecount($folder, $mode, $increment)
	{
	if (!is_numeric($increment)) {
	return false;
	}

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

	if (!is_array($a_folder_cache[$folder]) \|\| !isset($a_folder_cache[$folder][$mode])) {
	return false;
	}

	// 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;
	}


	/**
	* 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);
	}
	}


	/**
	* Converts date string/object into IMAP date/time format
	*/
	protected function date_format($date)
	{
	if (empty($date)) {
	return null;
	}

	if (!is_object($date) \|\| !is_a($date, 'DateTime')) {
	try {
	$timestamp = rcube_utils::strtotime($date);
	$date = new DateTime("@".$timestamp);
	}
	catch (Exception $e) {
	return null;
	}
	}

	return $date->format('d-M-Y H:i:s O');
	}


	/**
	* This is our own debug handler for the IMAP connection
	* @access public
	*/
	public function debug_handler(&$imap, $message)
	{
	rcube::write_log('imap', $message);
	}


	/**
	* 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 get_headers($uid, $folder = null, $force = false)
	{
	return $this->get_message_headers($uid, $folder, $force);
	}

	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);
	}

	function clear_mailbox($folder = null)
	{
	return $this->clear_folder($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);
	}

	}
	diff --git a/program/lib/Roundcube/rcube_imap_generic.php b/program/lib/Roundcube/rcube_imap_generic.php
	index b9a796c33..8532cf8ad 100644
	--- a/program/lib/Roundcube/rcube_imap_generic.php
	+++ b/program/lib/Roundcube/rcube_imap_generic.php
	@@ -1,3714 +1,3741 @@
	<?php

	/**
	+-----------------------------------------------------------------------+
	\| 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: \|
	\| Provide alternative IMAP library that doesn't rely on the standard \|
	\| C-Client based version. This allows to function regardless \|
	\| of whether or not the PHP build it's running on has IMAP \|
	\| functionality built-in. \|
	\| \|
	\| Based on Iloha IMAP Library. See http://ilohamail.org/ for details \|
	+-----------------------------------------------------------------------+
	\| Author: Aleksander Machniak <alec@alec.pl> \|
	\| Author: Ryo Chijiiwa <Ryo@IlohaMail.org> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* PHP based wrapper class to connect to an IMAP server
	*
	* @package Framework
	* @subpackage Storage
	*/
	class rcube_imap_generic
	{
	public $error;
	public $errornum;
	public $result;
	public $resultcode;
	public $selected;
	public $data = array();
	public $flags = array(
	'SEEN' => '\\Seen',
	'DELETED' => '\\Deleted',
	'ANSWERED' => '\\Answered',
	'DRAFT' => '\\Draft',
	'FLAGGED' => '\\Flagged',
	'FORWARDED' => '$Forwarded',
	'MDNSENT' => '$MDNSent',
	'' => '\\',
	);

	private $fp;
	private $host;
	private $logged = false;
	private $capability = array();
	private $capability_readed = false;
	private $prefs;
	private $cmd_tag;
	private $cmd_num = 0;
	private $resourceid;
	private $_debug = false;
	private $_debug_handler = false;

	const ERROR_OK = 0;
	const ERROR_NO = -1;
	const ERROR_BAD = -2;
	const ERROR_BYE = -3;
	const ERROR_UNKNOWN = -4;
	const ERROR_COMMAND = -5;
	const ERROR_READONLY = -6;

	const COMMAND_NORESPONSE = 1;
	const COMMAND_CAPABILITY = 2;
	const COMMAND_LASTLINE = 4;

	/**
	* Object constructor
	*/
	function __construct()
	{
	}

	/**
	* Send simple (one line) command to the connection stream
	*
	* @param string $string Command string
	* @param bool $endln True if CRLF need to be added at the end of command
	*
	* @param int Number of bytes sent, False on error
	*/
	function putLine($string, $endln=true)
	{
	if (!$this->fp)
	return false;

	if ($this->_debug) {
	$this->debug('C: '. rtrim($string));
	}

	$res = fwrite($this->fp, $string . ($endln ? "\r\n" : ''));

	if ($res === false) {
	@fclose($this->fp);
	$this->fp = null;
	}

	return $res;
	}

	/**
	* Send command to the connection stream with Command Continuation
	* Requests (RFC3501 7.5) and LITERAL+ (RFC2088) support
	*
	* @param string $string Command string
	* @param bool $endln True if CRLF need to be added at the end of command
	*
	* @return int\|bool Number of bytes sent, False on error
	*/
	function putLineC($string, $endln=true)
	{
	if (!$this->fp) {
	return false;
	}

	if ($endln) {
	$string .= "\r\n";
	}

	$res = 0;
	if ($parts = preg_split('/(\{[0-9]+\}\r\n)/m', $string, -1, PREG_SPLIT_DELIM_CAPTURE)) {
	for ($i=0, $cnt=count($parts); $i<$cnt; $i++) {
	if (preg_match('/^\{([0-9]+)\}\r\n$/', $parts[$i+1], $matches)) {
	// LITERAL+ support
	if ($this->prefs['literal+']) {
	$parts[$i+1] = sprintf("{%d+}\r\n", $matches[1]);
	}

	$bytes = $this->putLine($parts[$i].$parts[$i+1], false);
	if ($bytes === false)
	return false;
	$res += $bytes;

	// don't wait if server supports LITERAL+ capability
	if (!$this->prefs['literal+']) {
	$line = $this->readLine(1000);
	// handle error in command
	if ($line[0] != '+')
	return false;
	}
	$i++;
	}
	else {
	$bytes = $this->putLine($parts[$i], false);
	if ($bytes === false)
	return false;
	$res += $bytes;
	}
	}
	}
	return $res;
	}

	/**
	* Reads line from the connection stream
	*
	* @param int $size Buffer size
	*
	* @return string Line of text response
	*/
	function readLine($size=1024)
	{
	$line = '';

	if (!$size) {
	$size = 1024;
	}

	do {
	if ($this->eof()) {
	return $line ? $line : NULL;
	}

	$buffer = fgets($this->fp, $size);

	if ($buffer === false) {
	$this->closeSocket();
	break;
	}
	if ($this->_debug) {
	$this->debug('S: '. rtrim($buffer));
	}
	$line .= $buffer;
	} while (substr($buffer, -1) != "\n");

	return $line;
	}

	/**
	* Reads more data from the connection stream when provided
	* data contain string literal
	*
	* @param string $line Response text
	* @param bool $escape Enables escaping
	*
	* @return string Line of text response
	*/
	function multLine($line, $escape = false)
	{
	$line = rtrim($line);
	if (preg_match('/\{([0-9]+)\}$/', $line, $m)) {
	$out = '';
	$str = substr($line, 0, -strlen($m[0]));
	$bytes = $m[1];

	while (strlen($out) < $bytes) {
	$line = $this->readBytes($bytes);
	if ($line === NULL)
	break;
	$out .= $line;
	}

	$line = $str . ($escape ? $this->escape($out) : $out);
	}

	return $line;
	}

	/**
	* Reads specified number of bytes from the connection stream
	*
	* @param int $bytes Number of bytes to get
	*
	* @return string Response text
	*/
	function readBytes($bytes)
	{
	$data = '';
	$len = 0;
	while ($len < $bytes && !$this->eof())
	{
	$d = fread($this->fp, $bytes-$len);
	if ($this->_debug) {
	$this->debug('S: '. $d);
	}
	$data .= $d;
	$data_len = strlen($data);
	if ($len == $data_len) {
	break; // nothing was read -> exit to avoid apache lockups
	}
	$len = $data_len;
	}

	return $data;
	}

	/**
	* Reads complete response to the IMAP command
	*
	* @param array $untagged Will be filled with untagged response lines
	*
	* @return string Response text
	*/
	function readReply(&$untagged=null)
	{
	do {
	$line = trim($this->readLine(1024));
	// store untagged response lines
	if ($line[0] == '*')
	$untagged[] = $line;
	} while ($line[0] == '*');

	if ($untagged)
	$untagged = join("\n", $untagged);

	return $line;
	}

	/**
	* Response parser.
	*
	* @param string $string Response text
	* @param string $err_prefix Error message prefix
	*
	* @return int Response status
	*/
	function parseResult($string, $err_prefix='')
	{
	if (preg_match('/^[a-z0-9]+ (OK\|NO\|BAD\|BYE)(.)$/i', trim($string), $matches)) {
	$res = strtoupper($matches[1]);
	$str = trim($matches[2]);

	if ($res == 'OK') {
	$this->errornum = self::ERROR_OK;
	} else if ($res == 'NO') {
	$this->errornum = self::ERROR_NO;
	} else if ($res == 'BAD') {
	$this->errornum = self::ERROR_BAD;
	} else if ($res == 'BYE') {
	$this->closeSocket();
	$this->errornum = self::ERROR_BYE;
	}

	if ($str) {
	$str = trim($str);
	// get response string and code (RFC5530)
	if (preg_match("/^\[([a-z-]+)\]/i", $str, $m)) {
	$this->resultcode = strtoupper($m[1]);
	$str = trim(substr($str, strlen($m[1]) + 2));
	}
	else {
	$this->resultcode = null;
	// parse response for [APPENDUID 1204196876 3456]
	if (preg_match("/^\[APPENDUID [0-9]+ ([0-9]+)\]/i", $str, $m)) {
	$this->data['APPENDUID'] = $m[1];
	}
	// parse response for [COPYUID 1204196876 3456:3457 123:124]
	else if (preg_match("/^\[COPYUID [0-9]+ ([0-9,:]+) ([0-9,:]+)\]/i", $str, $m)) {
	$this->data['COPYUID'] = array($m[1], $m[2]);
	}
	}
	$this->result = $str;

	if ($this->errornum != self::ERROR_OK) {
	$this->error = $err_prefix ? $err_prefix.$str : $str;
	}
	}

	return $this->errornum;
	}
	return self::ERROR_UNKNOWN;
	}

	/**
	* Checks connection stream state.
	*
	* @return bool True if connection is closed
	*/
	private function eof()
	{
	if (!is_resource($this->fp)) {
	return true;
	}

	// If a connection opened by fsockopen() wasn't closed
	// by the server, feof() will hang.
	$start = microtime(true);

	if (feof($this->fp) \|\|
	($this->prefs['timeout'] && (microtime(true) - $start > $this->prefs['timeout']))
	) {
	$this->closeSocket();
	return true;
	}

	return false;
	}

	/**
	* Closes connection stream.
	*/
	private function closeSocket()
	{
	@fclose($this->fp);
	$this->fp = null;
	}

	/**
	* Error code/message setter.
	*/
	function setError($code, $msg='')
	{
	$this->errornum = $code;
	$this->error = $msg;
	}

	/**
	* Checks response status.
	* Checks if command response line starts with specified prefix (or * BYE/BAD)
	*
	* @param string $string Response text
	* @param string $match Prefix to match with (case-sensitive)
	* @param bool $error Enables BYE/BAD checking
	* @param bool $nonempty Enables empty response checking
	*
	* @return bool True any check is true or connection is closed.
	*/
	function startsWith($string, $match, $error=false, $nonempty=false)
	{
	if (!$this->fp) {
	return true;
	}
	if (strncmp($string, $match, strlen($match)) == 0) {
	return true;
	}
	if ($error && preg_match('/^\* (BYE\|BAD) /i', $string, $m)) {
	if (strtoupper($m[1]) == 'BYE') {
	$this->closeSocket();
	}
	return true;
	}
	if ($nonempty && !strlen($string)) {
	return true;
	}
	return false;
	}

	private function hasCapability($name)
	{
	if (empty($this->capability) \|\| $name == '') {
	return false;
	}

	if (in_array($name, $this->capability)) {
	return true;
	}
	else if (strpos($name, '=')) {
	return false;
	}

	$result = array();
	foreach ($this->capability as $cap) {
	$entry = explode('=', $cap);
	if ($entry[0] == $name) {
	$result[] = $entry[1];
	}
	}

	return !empty($result) ? $result : false;
	}

	/**
	* Capabilities checker
	*
	* @param string $name Capability name
	*
	* @return mixed Capability values array for key=value pairs, true/false for others
	*/
	function getCapability($name)
	{
	$result = $this->hasCapability($name);

	if (!empty($result)) {
	return $result;
	}
	else if ($this->capability_readed) {
	return false;
	}

	// get capabilities (only once) because initial
	// optional CAPABILITY response may differ
	$result = $this->execute('CAPABILITY');

	if ($result[0] == self::ERROR_OK) {
	$this->parseCapability($result[1]);
	}

	$this->capability_readed = true;

	return $this->hasCapability($name);
	}

	function clearCapability()
	{
	$this->capability = array();
	$this->capability_readed = false;
	}

	/**
	* DIGEST-MD5/CRAM-MD5/PLAIN Authentication
	*
	* @param string $user
	* @param string $pass
	* @param string $type Authentication type (PLAIN/CRAM-MD5/DIGEST-MD5)
	*
	* @return resource Connection resourse on success, error code on error
	*/
	function authenticate($user, $pass, $type='PLAIN')
	{
	if ($type == 'CRAM-MD5' \|\| $type == 'DIGEST-MD5') {
	if ($type == 'DIGEST-MD5' && !class_exists('Auth_SASL')) {
	$this->setError(self::ERROR_BYE,
	"The Auth_SASL package is required for DIGEST-MD5 authentication");
	return self::ERROR_BAD;
	}

	$this->putLine($this->nextTag() . " AUTHENTICATE $type");
	$line = trim($this->readReply());

	if ($line[0] == '+') {
	$challenge = substr($line, 2);
	}
	else {
	return $this->parseResult($line);
	}

	if ($type == 'CRAM-MD5') {
	// RFC2195: CRAM-MD5
	$ipad = '';
	$opad = '';

	// initialize ipad, opad
	for ($i=0; $i<64; $i++) {
	$ipad .= chr(0x36);
	$opad .= chr(0x5C);
	}

	// pad $pass so it's 64 bytes
	$padLen = 64 - strlen($pass);
	for ($i=0; $i<$padLen; $i++) {
	$pass .= chr(0);
	}

	// generate hash
	$hash = md5($this->_xor($pass, $opad) . pack("H*",
	md5($this->_xor($pass, $ipad) . base64_decode($challenge))));
	$reply = base64_encode($user . ' ' . $hash);

	// send result
	$this->putLine($reply);
	}
	else {
	// RFC2831: DIGEST-MD5
	// proxy authorization
	if (!empty($this->prefs['auth_cid'])) {
	$authc = $this->prefs['auth_cid'];
	$pass = $this->prefs['auth_pw'];
	}
	else {
	$authc = $user;
	$user = '';
	}
	$auth_sasl = Auth_SASL::factory('digestmd5');
	$reply = base64_encode($auth_sasl->getResponse($authc, $pass,
	base64_decode($challenge), $this->host, 'imap', $user));

	// send result
	$this->putLine($reply);
	$line = trim($this->readReply());

	if ($line[0] == '+') {
	$challenge = substr($line, 2);
	}
	else {
	return $this->parseResult($line);
	}

	// check response
	$challenge = base64_decode($challenge);
	if (strpos($challenge, 'rspauth=') === false) {
	$this->setError(self::ERROR_BAD,
	"Unexpected response from server to DIGEST-MD5 response");
	return self::ERROR_BAD;
	}

	$this->putLine('');
	}

	$line = $this->readReply();
	$result = $this->parseResult($line);
	}
	else { // PLAIN
	// proxy authorization
	if (!empty($this->prefs['auth_cid'])) {
	$authc = $this->prefs['auth_cid'];
	$pass = $this->prefs['auth_pw'];
	}
	else {
	$authc = $user;
	$user = '';
	}

	$reply = base64_encode($user . chr(0) . $authc . chr(0) . $pass);

	// RFC 4959 (SASL-IR): save one round trip
	if ($this->getCapability('SASL-IR')) {
	list($result, $line) = $this->execute("AUTHENTICATE PLAIN", array($reply),
	self::COMMAND_LASTLINE \| self::COMMAND_CAPABILITY);
	}
	else {
	$this->putLine($this->nextTag() . " AUTHENTICATE PLAIN");
	$line = trim($this->readReply());

	if ($line[0] != '+') {
	return $this->parseResult($line);
	}

	// send result, get reply and process it
	$this->putLine($reply);
	$line = $this->readReply();
	$result = $this->parseResult($line);
	}
	}

	if ($result == self::ERROR_OK) {
	// optional CAPABILITY response
	if ($line && preg_match('/\[CAPABILITY ([^]]+)\]/i', $line, $matches)) {
	$this->parseCapability($matches[1], true);
	}
	return $this->fp;
	}
	else {
	$this->setError($result, "AUTHENTICATE $type: $line");
	}

	return $result;
	}

	/**
	* LOGIN Authentication
	*
	* @param string $user
	* @param string $pass
	*
	* @return resource Connection resourse on success, error code on error
	*/
	function login($user, $password)
	{
	list($code, $response) = $this->execute('LOGIN', array(
	$this->escape($user), $this->escape($password)), self::COMMAND_CAPABILITY);

	// re-set capabilities list if untagged CAPABILITY response provided
	if (preg_match('/\* CAPABILITY (.+)/i', $response, $matches)) {
	$this->parseCapability($matches[1], true);
	}

	if ($code == self::ERROR_OK) {
	return $this->fp;
	}

	return $code;
	}

	/**
	* Detects hierarchy delimiter
	*
	* @return string The delimiter
	*/
	function getHierarchyDelimiter()
	{
	if ($this->prefs['delimiter']) {
	return $this->prefs['delimiter'];
	}

	// try (LIST "" ""), should return delimiter (RFC2060 Sec 6.3.8)
	list($code, $response) = $this->execute('LIST',
	array($this->escape(''), $this->escape('')));

	if ($code == self::ERROR_OK) {
	$args = $this->tokenizeResponse($response, 4);
	$delimiter = $args[3];

	if (strlen($delimiter) > 0) {
	return ($this->prefs['delimiter'] = $delimiter);
	}
	}

	return NULL;
	}

	/**
	* NAMESPACE handler (RFC 2342)
	*
	* @return array Namespace data hash (personal, other, shared)
	*/
	function getNamespace()
	{
	if (array_key_exists('namespace', $this->prefs)) {
	return $this->prefs['namespace'];
	}

	if (!$this->getCapability('NAMESPACE')) {
	return self::ERROR_BAD;
	}

	list($code, $response) = $this->execute('NAMESPACE');

	if ($code == self::ERROR_OK && preg_match('/^\* NAMESPACE /', $response)) {
	$data = $this->tokenizeResponse(substr($response, 11));
	}

	if (!is_array($data)) {
	return $code;
	}

	$this->prefs['namespace'] = array(
	'personal' => $data[0],
	'other' => $data[1],
	'shared' => $data[2],
	);

	return $this->prefs['namespace'];
	}

	/**
	* Connects to IMAP server and authenticates.
	*
	* @param string $host Server hostname or IP
	* @param string $user User name
	* @param string $password Password
	* @param array $options Connection and class options
	*
	* @return bool True on success, False on failure
	*/
	function connect($host, $user, $password, $options=null)
	{
	// set options
	if (is_array($options)) {
	$this->prefs = $options;
	}
	// set auth method
	if (!empty($this->prefs['auth_type'])) {
	$auth_method = strtoupper($this->prefs['auth_type']);
	} else {
	$auth_method = 'CHECK';
	}

	$result = false;

	// initialize connection
	$this->error = '';
	$this->errornum = self::ERROR_OK;
	$this->selected = null;
	$this->user = $user;
	$this->host = $host;
	$this->logged = false;

	// check input
	if (empty($host)) {
	$this->setError(self::ERROR_BAD, "Empty host");
	return false;
	}
	if (empty($user)) {
	$this->setError(self::ERROR_NO, "Empty user");
	return false;
	}
	if (empty($password)) {
	$this->setError(self::ERROR_NO, "Empty password");
	return false;
	}

	if (!$this->prefs['port']) {
	$this->prefs['port'] = 143;
	}
	// check for SSL
	if ($this->prefs['ssl_mode'] && $this->prefs['ssl_mode'] != 'tls') {
	$host = $this->prefs['ssl_mode'] . '://' . $host;
	}

	if ($this->prefs['timeout'] <= 0) {
	$this->prefs['timeout'] = ini_get('default_socket_timeout');
	}

	// Connect
	$this->fp = @fsockopen($host, $this->prefs['port'], $errno, $errstr, $this->prefs['timeout']);

	if (!$this->fp) {
	if (!$errstr) {
	$errstr = "Unknown reason (fsockopen() function disabled?)";
	}
	$this->setError(self::ERROR_BAD, sprintf("Could not connect to %s:%d: %s", $host, $this->prefs['port'], $errstr));
	return false;
	}

	if ($this->prefs['timeout'] > 0) {
	stream_set_timeout($this->fp, $this->prefs['timeout']);
	}

	$line = trim(fgets($this->fp, 8192));

	if ($this->_debug) {
	// set connection identifier for debug output
	preg_match('/#([0-9]+)/', (string)$this->fp, $m);
	$this->resourceid = strtoupper(substr(md5($m[1].$this->user.microtime()), 0, 4));

	if ($line)
	$this->debug('S: '. $line);
	}

	// Connected to wrong port or connection error?
	if (!preg_match('/^\* (OK\|PREAUTH)/i', $line)) {
	if ($line)
	$error = sprintf("Wrong startup greeting (%s:%d): %s", $host, $this->prefs['port'], $line);
	else
	$error = sprintf("Empty startup greeting (%s:%d)", $host, $this->prefs['port']);

	$this->setError(self::ERROR_BAD, $error);
	$this->closeConnection();
	return false;
	}

	// RFC3501 [7.1] optional CAPABILITY response
	if (preg_match('/\[CAPABILITY ([^]]+)\]/i', $line, $matches)) {
	$this->parseCapability($matches[1], true);
	}

	// TLS connection
	if ($this->prefs['ssl_mode'] == 'tls' && $this->getCapability('STARTTLS')) {
	if (version_compare(PHP_VERSION, '5.1.0', '>=')) {
	$res = $this->execute('STARTTLS');

	if ($res[0] != self::ERROR_OK) {
	$this->closeConnection();
	return false;
	}

	if (!stream_socket_enable_crypto($this->fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
	$this->setError(self::ERROR_BAD, "Unable to negotiate TLS");
	$this->closeConnection();
	return false;
	}

	// Now we're secure, capabilities need to be reread
	$this->clearCapability();
	}
	}

	// Send ID info
	if (!empty($this->prefs['ident']) && $this->getCapability('ID')) {
	$this->id($this->prefs['ident']);
	}

	$auth_methods = array();
	$result = null;

	// check for supported auth methods
	if ($auth_method == 'CHECK') {
	if ($auth_caps = $this->getCapability('AUTH')) {
	$auth_methods = $auth_caps;
	}
	// RFC 2595 (LOGINDISABLED) LOGIN disabled when connection is not secure
	$login_disabled = $this->getCapability('LOGINDISABLED');
	if (($key = array_search('LOGIN', $auth_methods)) !== false) {
	if ($login_disabled) {
	unset($auth_methods[$key]);
	}
	}
	else if (!$login_disabled) {
	$auth_methods[] = 'LOGIN';
	}

	// Use best (for security) supported authentication method
	foreach (array('DIGEST-MD5', 'CRAM-MD5', 'CRAM_MD5', 'PLAIN', 'LOGIN') as $auth_method) {
	if (in_array($auth_method, $auth_methods)) {
	break;
	}
	}
	}
	else {
	// Prevent from sending credentials in plain text when connection is not secure
	if ($auth_method == 'LOGIN' && $this->getCapability('LOGINDISABLED')) {
	$this->setError(self::ERROR_BAD, "Login disabled by IMAP server");
	$this->closeConnection();
	return false;
	}
	// replace AUTH with CRAM-MD5 for backward compat.
	if ($auth_method == 'AUTH') {
	$auth_method = 'CRAM-MD5';
	}
	}

	// pre-login capabilities can be not complete
	$this->capability_readed = false;

	// Authenticate
	switch ($auth_method) {
	case 'CRAM_MD5':
	$auth_method = 'CRAM-MD5';
	case 'CRAM-MD5':
	case 'DIGEST-MD5':
	case 'PLAIN':
	$result = $this->authenticate($user, $password, $auth_method);
	break;
	case 'LOGIN':
	$result = $this->login($user, $password);
	break;
	default:
	$this->setError(self::ERROR_BAD, "Configuration error. Unknown auth method: $auth_method");
	}

	// Connected and authenticated
	if (is_resource($result)) {
	if ($this->prefs['force_caps']) {
	$this->clearCapability();
	}
	$this->logged = true;

	return true;
	}

	$this->closeConnection();

	return false;
	}

	/**
	* Checks connection status
	*
	* @return bool True if connection is active and user is logged in, False otherwise.
	*/
	function connected()
	{
	return ($this->fp && $this->logged) ? true : false;
	}

	/**
	* Closes connection with logout.
	*/
	function closeConnection()
	{
	if ($this->logged && $this->putLine($this->nextTag() . ' LOGOUT')) {
	$this->readReply();
	}

	$this->closeSocket();
	}

	/**
	* Executes SELECT command (if mailbox is already not in selected state)
	*
	* @param string $mailbox Mailbox name
	* @param array $qresync_data QRESYNC data (RFC5162)
	*
	* @return boolean True on success, false on error
	*/
	function select($mailbox, $qresync_data = null)
	{
	if (!strlen($mailbox)) {
	return false;
	}

	if ($this->selected === $mailbox) {
	return true;
	}
	/*
	Temporary commented out because Courier returns \Noselect for INBOX
	Requires more investigation

	if (is_array($this->data['LIST']) && is_array($opts = $this->data['LIST'][$mailbox])) {
	if (in_array('\\Noselect', $opts)) {
	return false;
	}
	}
	*/
	$params = array($this->escape($mailbox));

	// QRESYNC data items
	// 0. the last known UIDVALIDITY,
	// 1. the last known modification sequence,
	// 2. the optional set of known UIDs, and
	// 3. an optional parenthesized list of known sequence ranges and their
	// corresponding UIDs.
	if (!empty($qresync_data)) {
	if (!empty($qresync_data[2]))
	$qresync_data[2] = self::compressMessageSet($qresync_data[2]);
	$params[] = array('QRESYNC', $qresync_data);
	}

	list($code, $response) = $this->execute('SELECT', $params);

	if ($code == self::ERROR_OK) {
	$response = explode("\r\n", $response);
	foreach ($response as $line) {
	if (preg_match('/^\* ([0-9]+) (EXISTS\|RECENT)$/i', $line, $m)) {
	$this->data[strtoupper($m[2])] = (int) $m[1];
	}
	else if (preg_match('/^\* OK \[/i', $line, $match)) {
	$line = substr($line, 6);
	if (preg_match('/^(UIDNEXT\|UIDVALIDITY\|UNSEEN) ([0-9]+)/i', $line, $match)) {
	$this->data[strtoupper($match[1])] = (int) $match[2];
	}
	else if (preg_match('/^(HIGHESTMODSEQ) ([0-9]+)/i', $line, $match)) {
	$this->data[strtoupper($match[1])] = (string) $match[2];
	}
	else if (preg_match('/^(NOMODSEQ)/i', $line, $match)) {
	$this->data[strtoupper($match[1])] = true;
	}
	else if (preg_match('/^PERMANENTFLAGS $([^$]+)\)/iU', $line, $match)) {
	$this->data['PERMANENTFLAGS'] = explode(' ', $match[1]);
	}
	}
	// QRESYNC FETCH response (RFC5162)
	else if (preg_match('/^\* ([0-9+]) FETCH/i', $line, $match)) {
	$line = substr($line, strlen($match[0]));
	$fetch_data = $this->tokenizeResponse($line, 1);
	$data = array('id' => $match[1]);

	for ($i=0, $size=count($fetch_data); $i<$size; $i+=2) {
	$data[strtolower($fetch_data[$i])] = $fetch_data[$i+1];
	}

	$this->data['QRESYNC'][$data['uid']] = $data;
	}
	// QRESYNC VANISHED response (RFC5162)
	else if (preg_match('/^\* VANISHED [()EARLIER]*/i', $line, $match)) {
	$line = substr($line, strlen($match[0]));
	$v_data = $this->tokenizeResponse($line, 1);

	$this->data['VANISHED'] = $v_data;
	}
	}

	$this->data['READ-WRITE'] = $this->resultcode != 'READ-ONLY';

	$this->selected = $mailbox;
	return true;
	}

	return false;
	}

	/**
	* Executes STATUS command
	*
	* @param string $mailbox Mailbox name
	* @param array $items Additional requested item names. By default
	* MESSAGES and UNSEEN are requested. Other defined
	* in RFC3501: UIDNEXT, UIDVALIDITY, RECENT
	*
	* @return array Status item-value hash
	* @since 0.5-beta
	*/
	function status($mailbox, $items=array())
	{
	if (!strlen($mailbox)) {
	return false;
	}

	if (!in_array('MESSAGES', $items)) {
	$items[] = 'MESSAGES';
	}
	if (!in_array('UNSEEN', $items)) {
	$items[] = 'UNSEEN';
	}

	list($code, $response) = $this->execute('STATUS', array($this->escape($mailbox),
	'(' . implode(' ', (array) $items) . ')'));

	if ($code == self::ERROR_OK && preg_match('/\* STATUS /i', $response)) {
	$result = array();
	$response = substr($response, 9); // remove prefix "* STATUS "

	list($mbox, $items) = $this->tokenizeResponse($response, 2);

	// Fix for #1487859. Some buggy server returns not quoted
	// folder name with spaces. Let's try to handle this situation
	if (!is_array($items) && ($pos = strpos($response, '(')) !== false) {
	$response = substr($response, $pos);
	$items = $this->tokenizeResponse($response, 1);
	if (!is_array($items)) {
	return $result;
	}
	}

	for ($i=0, $len=count($items); $i<$len; $i += 2) {
	$result[$items[$i]] = $items[$i+1];
	}

	$this->data['STATUS:'.$mailbox] = $result;

	return $result;
	}

	return false;
	}

	/**
	* Executes EXPUNGE command
	*
	- * @param string $mailbox Mailbox name
	- * @param string $messages Message UIDs to expunge
	+ * @param string $mailbox Mailbox name
	+ * @param string\|array $messages Message UIDs to expunge
	*
	* @return boolean True on success, False on error
	*/
	function expunge($mailbox, $messages=NULL)
	{
	if (!$this->select($mailbox)) {
	return false;
	}

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

	// Clear internal status cache
	unset($this->data['STATUS:'.$mailbox]);

	- if ($messages)
	- $result = $this->execute('UID EXPUNGE', array($messages), self::COMMAND_NORESPONSE);
	- else
	+ if (!empty($messages) && $messages != '*' && $this->hasCapability('UIDPLUS')) {
	+ $messages = self::compressMessageSet($messages);
	+ $result = $this->execute('UID EXPUNGE', array($messages), self::COMMAND_NORESPONSE);
	+ }
	+ else {
	$result = $this->execute('EXPUNGE', null, self::COMMAND_NORESPONSE);
	+ }

	if ($result == self::ERROR_OK) {
	$this->selected = null; // state has changed, need to reselect
	return true;
	}

	return false;
	}

	/**
	* Executes CLOSE command
	*
	* @return boolean True on success, False on error
	* @since 0.5
	*/
	function close()
	{
	$result = $this->execute('CLOSE', NULL, self::COMMAND_NORESPONSE);

	if ($result == self::ERROR_OK) {
	$this->selected = null;
	return true;
	}

	return false;
	}

	/**
	* Folder subscription (SUBSCRIBE)
	*
	* @param string $mailbox Mailbox name
	*
	* @return boolean True on success, False on error
	*/
	function subscribe($mailbox)
	{
	$result = $this->execute('SUBSCRIBE', array($this->escape($mailbox)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Folder unsubscription (UNSUBSCRIBE)
	*
	* @param string $mailbox Mailbox name
	*
	* @return boolean True on success, False on error
	*/
	function unsubscribe($mailbox)
	{
	$result = $this->execute('UNSUBSCRIBE', array($this->escape($mailbox)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Folder creation (CREATE)
	*
	* @param string $mailbox Mailbox name
	*
	* @return bool True on success, False on error
	*/
	function createFolder($mailbox)
	{
	$result = $this->execute('CREATE', array($this->escape($mailbox)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Folder renaming (RENAME)
	*
	* @param string $mailbox Mailbox name
	*
	* @return bool True on success, False on error
	*/
	function renameFolder($from, $to)
	{
	$result = $this->execute('RENAME', array($this->escape($from), $this->escape($to)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Executes DELETE command
	*
	* @param string $mailbox Mailbox name
	*
	* @return boolean True on success, False on error
	*/
	function deleteFolder($mailbox)
	{
	$result = $this->execute('DELETE', array($this->escape($mailbox)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Removes all messages in a folder
	*
	* @param string $mailbox Mailbox name
	*
	* @return boolean True on success, False on error
	*/
	function clearFolder($mailbox)
	{
	$num_in_trash = $this->countMessages($mailbox);
	if ($num_in_trash > 0) {
	$res = $this->flag($mailbox, '1:*', 'DELETED');
	}

	if ($res) {
	if ($this->selected === $mailbox)
	$res = $this->close();
	else
	$res = $this->expunge($mailbox);
	}

	return $res;
	}

	/**
	* Returns list of mailboxes
	*
	* @param string $ref Reference name
	* @param string $mailbox Mailbox name
	* @param array $status_opts (see self::_listMailboxes)
	* @param array $select_opts (see self::_listMailboxes)
	*
	* @return array List of mailboxes or hash of options if $status_opts argument
	* is non-empty.
	*/
	function listMailboxes($ref, $mailbox, $status_opts=array(), $select_opts=array())
	{
	return $this->_listMailboxes($ref, $mailbox, false, $status_opts, $select_opts);
	}

	/**
	* Returns list of subscribed mailboxes
	*
	* @param string $ref Reference name
	* @param string $mailbox Mailbox name
	* @param array $status_opts (see self::_listMailboxes)
	*
	* @return array List of mailboxes or hash of options if $status_opts argument
	* is non-empty.
	*/
	function listSubscribed($ref, $mailbox, $status_opts=array())
	{
	return $this->_listMailboxes($ref, $mailbox, true, $status_opts, NULL);
	}

	/**
	* IMAP LIST/LSUB command
	*
	* @param string $ref Reference name
	* @param string $mailbox Mailbox name
	* @param bool $subscribed Enables returning subscribed mailboxes only
	* @param array $status_opts List of STATUS options (RFC5819: LIST-STATUS)
	* Possible: MESSAGES, RECENT, UIDNEXT, UIDVALIDITY, UNSEEN
	* @param array $select_opts List of selection options (RFC5258: LIST-EXTENDED)
	* Possible: SUBSCRIBED, RECURSIVEMATCH, REMOTE
	*
	* @return array List of mailboxes or hash of options if $status_ops argument
	* is non-empty.
	*/
	private function _listMailboxes($ref, $mailbox, $subscribed=false,
	$status_opts=array(), $select_opts=array())
	{
	if (!strlen($mailbox)) {
	$mailbox = '*';
	}

	$args = array();

	if (!empty($select_opts) && $this->getCapability('LIST-EXTENDED')) {
	$select_opts = (array) $select_opts;

	$args[] = '(' . implode(' ', $select_opts) . ')';
	}

	$args[] = $this->escape($ref);
	$args[] = $this->escape($mailbox);

	if (!empty($status_opts) && $this->getCapability('LIST-STATUS')) {
	$status_opts = (array) $status_opts;
	$lstatus = true;

	$args[] = 'RETURN (STATUS (' . implode(' ', $status_opts) . '))';
	}

	list($code, $response) = $this->execute($subscribed ? 'LSUB' : 'LIST', $args);

	if ($code == self::ERROR_OK) {
	$folders = array();
	$last = 0;
	$pos = 0;
	$response .= "\r\n";

	while ($pos = strpos($response, "\r\n", $pos+1)) {
	// literal string, not real end-of-command-line
	if ($response[$pos-1] == '}') {
	continue;
	}

	$line = substr($response, $last, $pos - $last);
	$last = $pos + 2;

	if (!preg_match('/^\* (LIST\|LSUB\|STATUS) /i', $line, $m)) {
	continue;
	}
	$cmd = strtoupper($m[1]);
	$line = substr($line, strlen($m[0]));

	// * LIST (<options>) <delimiter> <mailbox>
	if ($cmd == 'LIST' \|\| $cmd == 'LSUB') {
	list($opts, $delim, $mailbox) = $this->tokenizeResponse($line, 3);

	// Remove redundant separator at the end of folder name, UW-IMAP bug? (#1488879)
	if ($delim) {
	$mailbox = rtrim($mailbox, $delim);
	}

	// Add to result array
	if (!$lstatus) {
	$folders[] = $mailbox;
	}
	else {
	$folders[$mailbox] = array();
	}

	// store LSUB options only if not empty, this way
	// we can detect a situation when LIST doesn't return specified folder
	if (!empty($opts) \|\| $cmd == 'LIST') {
	// Add to options array
	if (empty($this->data['LIST'][$mailbox]))
	$this->data['LIST'][$mailbox] = $opts;
	else if (!empty($opts))
	$this->data['LIST'][$mailbox] = array_unique(array_merge(
	$this->data['LIST'][$mailbox], $opts));
	}
	}
	// * STATUS <mailbox> (<result>)
	else if ($cmd == 'STATUS') {
	list($mailbox, $status) = $this->tokenizeResponse($line, 2);

	for ($i=0, $len=count($status); $i<$len; $i += 2) {
	list($name, $value) = $this->tokenizeResponse($status, 2);
	$folders[$mailbox][$name] = $value;
	}
	}
	}

	return $folders;
	}

	return false;
	}

	/**
	* Returns count of all messages in a folder
	*
	* @param string $mailbox Mailbox name
	*
	* @return int Number of messages, False on error
	*/
	function countMessages($mailbox, $refresh = false)
	{
	if ($refresh) {
	$this->selected = null;
	}

	if ($this->selected === $mailbox) {
	return $this->data['EXISTS'];
	}

	// Check internal cache
	$cache = $this->data['STATUS:'.$mailbox];
	if (!empty($cache) && isset($cache['MESSAGES'])) {
	return (int) $cache['MESSAGES'];
	}

	// Try STATUS (should be faster than SELECT)
	$counts = $this->status($mailbox);
	if (is_array($counts)) {
	return (int) $counts['MESSAGES'];
	}

	return false;
	}

	/**
	* Returns count of messages with \Recent flag in a folder
	*
	* @param string $mailbox Mailbox name
	*
	* @return int Number of messages, False on error
	*/
	function countRecent($mailbox)
	{
	if (!strlen($mailbox)) {
	$mailbox = 'INBOX';
	}

	$this->select($mailbox);

	if ($this->selected === $mailbox) {
	return $this->data['RECENT'];
	}

	return false;
	}

	/**
	* Returns count of messages without \Seen flag in a specified folder
	*
	* @param string $mailbox Mailbox name
	*
	* @return int Number of messages, False on error
	*/
	function countUnseen($mailbox)
	{
	// Check internal cache
	$cache = $this->data['STATUS:'.$mailbox];
	if (!empty($cache) && isset($cache['UNSEEN'])) {
	return (int) $cache['UNSEEN'];
	}

	// Try STATUS (should be faster than SELECT+SEARCH)
	$counts = $this->status($mailbox);
	if (is_array($counts)) {
	return (int) $counts['UNSEEN'];
	}

	// Invoke SEARCH as a fallback
	$index = $this->search($mailbox, 'ALL UNSEEN', false, array('COUNT'));
	if (!$index->is_error()) {
	return $index->count();
	}

	return false;
	}

	/**
	* Executes ID command (RFC2971)
	*
	* @param array $items Client identification information key/value hash
	*
	* @return array Server identification information key/value hash
	* @since 0.6
	*/
	function id($items=array())
	{
	if (is_array($items) && !empty($items)) {
	foreach ($items as $key => $value) {
	$args[] = $this->escape($key, true);
	$args[] = $this->escape($value, true);
	}
	}

	list($code, $response) = $this->execute('ID', array(
	!empty($args) ? '(' . implode(' ', (array) $args) . ')' : $this->escape(null)
	));


	if ($code == self::ERROR_OK && preg_match('/\* ID /i', $response)) {
	$response = substr($response, 5); // remove prefix "* ID "
	$items = $this->tokenizeResponse($response, 1);
	$result = null;

	for ($i=0, $len=count($items); $i<$len; $i += 2) {
	$result[$items[$i]] = $items[$i+1];
	}

	return $result;
	}

	return false;
	}

	/**
	* Executes ENABLE command (RFC5161)
	*
	* @param mixed $extension Extension name to enable (or array of names)
	*
	* @return array\|bool List of enabled extensions, False on error
	* @since 0.6
	*/
	function enable($extension)
	{
	if (empty($extension)) {
	return false;
	}

	if (!$this->hasCapability('ENABLE')) {
	return false;
	}

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

	if (!empty($this->extensions_enabled)) {
	// check if all extensions are already enabled
	$diff = array_diff($extension, $this->extensions_enabled);

	if (empty($diff)) {
	return $extension;
	}

	// Make sure the mailbox isn't selected, before enabling extension(s)
	if ($this->selected !== null) {
	$this->close();
	}
	}

	list($code, $response) = $this->execute('ENABLE', $extension);

	if ($code == self::ERROR_OK && preg_match('/\* ENABLED /i', $response)) {
	$response = substr($response, 10); // remove prefix "* ENABLED "
	$result = (array) $this->tokenizeResponse($response);

	$this->extensions_enabled = array_unique(array_merge((array)$this->extensions_enabled, $result));

	return $this->extensions_enabled;
	}

	return false;
	}

	/**
	* Executes SORT command
	*
	* @param string $mailbox Mailbox name
	* @param string $field Field to sort by (ARRIVAL, CC, DATE, FROM, SIZE, SUBJECT, TO)
	* @param string $add Searching criteria
	* @param bool $return_uid Enables UID SORT usage
	* @param string $encoding Character set
	*
	* @return rcube_result_index Response data
	*/
	function sort($mailbox, $field, $add='', $return_uid=false, $encoding = 'US-ASCII')
	{
	$field = strtoupper($field);
	if ($field == 'INTERNALDATE') {
	$field = 'ARRIVAL';
	}

	$fields = array('ARRIVAL' => 1,'CC' => 1,'DATE' => 1,
	'FROM' => 1, 'SIZE' => 1, 'SUBJECT' => 1, 'TO' => 1);

	if (!$fields[$field]) {
	return new rcube_result_index($mailbox);
	}

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

	// RFC 5957: SORT=DISPLAY
	if (($field == 'FROM' \|\| $field == 'TO') && $this->getCapability('SORT=DISPLAY')) {
	$field = 'DISPLAY' . $field;
	}

	// message IDs
	if (!empty($add))
	$add = $this->compressMessageSet($add);

	list($code, $response) = $this->execute($return_uid ? 'UID SORT' : 'SORT',
	array("($field)", $encoding, 'ALL' . (!empty($add) ? ' '.$add : '')));

	if ($code != self::ERROR_OK) {
	$response = null;
	}

	return new rcube_result_index($mailbox, $response);
	}

	/**
	* Executes THREAD command
	*
	* @param string $mailbox Mailbox name
	* @param string $algorithm Threading algorithm (ORDEREDSUBJECT, REFERENCES, REFS)
	* @param string $criteria Searching criteria
	* @param bool $return_uid Enables UIDs in result instead of sequence numbers
	* @param string $encoding Character set
	*
	* @return rcube_result_thread Thread data
	*/
	function thread($mailbox, $algorithm='REFERENCES', $criteria='', $return_uid=false, $encoding='US-ASCII')
	{
	$old_sel = $this->selected;

	if (!$this->select($mailbox)) {
	return new rcube_result_thread($mailbox);
	}

	// return empty result when folder is empty and we're just after SELECT
	if ($old_sel != $mailbox && !$this->data['EXISTS']) {
	return new rcube_result_thread($mailbox);
	}

	$encoding = $encoding ? trim($encoding) : 'US-ASCII';
	$algorithm = $algorithm ? trim($algorithm) : 'REFERENCES';
	$criteria = $criteria ? 'ALL '.trim($criteria) : 'ALL';
	$data = '';

	list($code, $response) = $this->execute($return_uid ? 'UID THREAD' : 'THREAD',
	array($algorithm, $encoding, $criteria));

	if ($code != self::ERROR_OK) {
	$response = null;
	}

	return new rcube_result_thread($mailbox, $response);
	}

	/**
	* Executes SEARCH command
	*
	* @param string $mailbox Mailbox name
	* @param string $criteria Searching criteria
	* @param bool $return_uid Enable UID in result instead of sequence ID
	* @param array $items Return items (MIN, MAX, COUNT, ALL)
	*
	* @return rcube_result_index Result data
	*/
	function search($mailbox, $criteria, $return_uid=false, $items=array())
	{
	$old_sel = $this->selected;

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

	// return empty result when folder is empty and we're just after SELECT
	if ($old_sel != $mailbox && !$this->data['EXISTS']) {
	return new rcube_result_index($mailbox, '* SEARCH');
	}

	// If ESEARCH is supported always use ALL
	// but not when items are specified or using simple id2uid search
	if (empty($items) && preg_match('/[^0-9]/', $criteria)) {
	$items = array('ALL');
	}

	$esearch = empty($items) ? false : $this->getCapability('ESEARCH');
	$criteria = trim($criteria);
	$params = '';

	// RFC4731: ESEARCH
	if (!empty($items) && $esearch) {
	$params .= 'RETURN (' . implode(' ', $items) . ')';
	}

	if (!empty($criteria)) {
	$modseq = stripos($criteria, 'MODSEQ') !== false;
	$params .= ($params ? ' ' : '') . $criteria;
	}
	else {
	$params .= 'ALL';
	}

	list($code, $response) = $this->execute($return_uid ? 'UID SEARCH' : 'SEARCH',
	array($params));

	if ($code != self::ERROR_OK) {
	$response = null;
	}

	return new rcube_result_index($mailbox, $response);
	}

	/**
	* Simulates SORT command by using FETCH and sorting.
	*
	* @param string $mailbox Mailbox name
	* @param string\|array $message_set Searching criteria (list of messages to return)
	* @param string $index_field Field to sort by (ARRIVAL, CC, DATE, FROM, SIZE, SUBJECT, TO)
	* @param bool $skip_deleted Makes that DELETED messages will be skipped
	* @param bool $uidfetch Enables UID FETCH usage
	* @param bool $return_uid Enables returning UIDs instead of IDs
	*
	* @return rcube_result_index Response data
	*/
	function index($mailbox, $message_set, $index_field='', $skip_deleted=true,
	$uidfetch=false, $return_uid=false)
	{
	$msg_index = $this->fetchHeaderIndex($mailbox, $message_set,
	$index_field, $skip_deleted, $uidfetch, $return_uid);

	if (!empty($msg_index)) {
	asort($msg_index); // ASC
	$msg_index = array_keys($msg_index);
	$msg_index = '* SEARCH ' . implode(' ', $msg_index);
	}
	else {
	$msg_index = is_array($msg_index) ? '* SEARCH' : null;
	}

	return new rcube_result_index($mailbox, $msg_index);
	}

	function fetchHeaderIndex($mailbox, $message_set, $index_field='', $skip_deleted=true,
	$uidfetch=false, $return_uid=false)
	{
	if (is_array($message_set)) {
	if (!($message_set = $this->compressMessageSet($message_set)))
	return false;
	} else {
	list($from_idx, $to_idx) = explode(':', $message_set);
	if (empty($message_set) \|\|
	(isset($to_idx) && $to_idx != '*' && (int)$from_idx > (int)$to_idx)) {
	return false;
	}
	}

	$index_field = empty($index_field) ? 'DATE' : strtoupper($index_field);

	$fields_a['DATE'] = 1;
	$fields_a['INTERNALDATE'] = 4;
	$fields_a['ARRIVAL'] = 4;
	$fields_a['FROM'] = 1;
	$fields_a['REPLY-TO'] = 1;
	$fields_a['SENDER'] = 1;
	$fields_a['TO'] = 1;
	$fields_a['CC'] = 1;
	$fields_a['SUBJECT'] = 1;
	$fields_a['UID'] = 2;
	$fields_a['SIZE'] = 2;
	$fields_a['SEEN'] = 3;
	$fields_a['RECENT'] = 3;
	$fields_a['DELETED'] = 3;

	if (!($mode = $fields_a[$index_field])) {
	return false;
	}

	/* Do "SELECT" command */
	if (!$this->select($mailbox)) {
	return false;
	}

	// build FETCH command string
	$key = $this->nextTag();
	$cmd = $uidfetch ? 'UID FETCH' : 'FETCH';
	$fields = array();

	if ($return_uid)
	$fields[] = 'UID';
	if ($skip_deleted)
	$fields[] = 'FLAGS';

	if ($mode == 1) {
	if ($index_field == 'DATE')
	$fields[] = 'INTERNALDATE';
	$fields[] = "BODY.PEEK[HEADER.FIELDS ($index_field)]";
	}
	else if ($mode == 2) {
	if ($index_field == 'SIZE')
	$fields[] = 'RFC822.SIZE';
	else if (!$return_uid \|\| $index_field != 'UID')
	$fields[] = $index_field;
	}
	else if ($mode == 3 && !$skip_deleted)
	$fields[] = 'FLAGS';
	else if ($mode == 4)
	$fields[] = 'INTERNALDATE';

	$request = "$key $cmd $message_set (" . implode(' ', $fields) . ")";

	if (!$this->putLine($request)) {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	return false;
	}

	$result = array();

	do {
	$line = rtrim($this->readLine(200));
	$line = $this->multLine($line);

	if (preg_match('/^\* ([0-9]+) FETCH/', $line, $m)) {
	$id = $m[1];
	$flags = NULL;

	if ($return_uid) {
	if (preg_match('/UID ([0-9]+)/', $line, $matches))
	$id = (int) $matches[1];
	else
	continue;
	}
	if ($skip_deleted && preg_match('/FLAGS $([^)]+)$/', $line, $matches)) {
	$flags = explode(' ', strtoupper($matches[1]));
	if (in_array('\\DELETED', $flags)) {
	$deleted[$id] = $id;
	continue;
	}
	}

	if ($mode == 1 && $index_field == 'DATE') {
	if (preg_match('/BODY\[HEADER\.FIELDS $"DATE"$\] (.*)/', $line, $matches)) {
	$value = preg_replace(array('/^"*[a-z]+:/i'), '', $matches[1]);
	$value = trim($value);
	$result[$id] = $this->strToTime($value);
	}
	// non-existent/empty Date: header, use INTERNALDATE
	if (empty($result[$id])) {
	if (preg_match('/INTERNALDATE "([^"]+)"/', $line, $matches))
	$result[$id] = $this->strToTime($matches[1]);
	else
	$result[$id] = 0;
	}
	} else if ($mode == 1) {
	if (preg_match('/BODY\[HEADER\.FIELDS $"?(FROM\|REPLY-TO\|SENDER\|TO\|SUBJECT)"?$\] (.*)/', $line, $matches)) {
	$value = preg_replace(array('/^"*[a-z]+:/i', '/\s+$/sm'), array('', ''), $matches[2]);
	$result[$id] = trim($value);
	} else {
	$result[$id] = '';
	}
	} else if ($mode == 2) {
	if (preg_match('/(UID\|RFC822\.SIZE) ([0-9]+)/', $line, $matches)) {
	$result[$id] = trim($matches[2]);
	} else {
	$result[$id] = 0;
	}
	} else if ($mode == 3) {
	if (!$flags && preg_match('/FLAGS $([^)]+)$/', $line, $matches)) {
	$flags = explode(' ', $matches[1]);
	}
	$result[$id] = in_array('\\'.$index_field, $flags) ? 1 : 0;
	} else if ($mode == 4) {
	if (preg_match('/INTERNALDATE "([^"]+)"/', $line, $matches)) {
	$result[$id] = $this->strToTime($matches[1]);
	} else {
	$result[$id] = 0;
	}
	}
	}
	} while (!$this->startsWith($line, $key, true, true));

	return $result;
	}

	/**
	* Returns message sequence identifier
	*
	* @param string $mailbox Mailbox name
	* @param int $uid Message unique identifier (UID)
	*
	* @return int Message sequence identifier
	*/
	function UID2ID($mailbox, $uid)
	{
	if ($uid > 0) {
	$index = $this->search($mailbox, "UID $uid");

	if ($index->count() == 1) {
	$arr = $index->get();
	return (int) $arr[0];
	}
	}
	return null;
	}

	/**
	* Returns message unique identifier (UID)
	*
	* @param string $mailbox Mailbox name
	* @param int $uid Message sequence identifier
	*
	* @return int Message unique identifier
	*/
	function ID2UID($mailbox, $id)
	{
	if (empty($id) \|\| $id < 0) {
	return null;
	}

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

	$index = $this->search($mailbox, $id, true);

	if ($index->count() == 1) {
	$arr = $index->get();
	return (int) $arr[0];
	}

	return null;
	}

	/**
	* Sets flag of the message(s)
	*
	* @param string $mailbox Mailbox name
	* @param string\|array $messages Message UID(s)
	* @param string $flag Flag name
	*
	* @return bool True on success, False on failure
	*/
	function flag($mailbox, $messages, $flag) {
	return $this->modFlag($mailbox, $messages, $flag, '+');
	}

	/**
	* Unsets flag of the message(s)
	*
	* @param string $mailbox Mailbox name
	* @param string\|array $messages Message UID(s)
	* @param string $flag Flag name
	*
	* @return bool True on success, False on failure
	*/
	function unflag($mailbox, $messages, $flag) {
	return $this->modFlag($mailbox, $messages, $flag, '-');
	}

	/**
	* Changes flag of the message(s)
	*
	* @param string $mailbox Mailbox name
	* @param string\|array $messages Message UID(s)
	* @param string $flag Flag name
	* @param string $mod Modifier [+\|-]. Default: "+".
	*
	* @return bool True on success, False on failure
	*/
	private function modFlag($mailbox, $messages, $flag, $mod = '+')
	{
	if ($mod != '+' && $mod != '-') {
	$mod = '+';
	}

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

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

	// Clear internal status cache
	if ($flag == 'SEEN') {
	unset($this->data['STATUS:'.$mailbox]['UNSEEN']);
	}

	$flag = $this->flags[strtoupper($flag)];
	$result = $this->execute('UID STORE', array(
	$this->compressMessageSet($messages), $mod . 'FLAGS.SILENT', "($flag)"),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Copies message(s) from one folder to another
	*
	* @param string\|array $messages Message UID(s)
	* @param string $from Mailbox name
	* @param string $to Destination mailbox name
	*
	* @return bool True on success, False on failure
	*/
	function copy($messages, $from, $to)
	{
	// Clear last COPYUID data
	unset($this->data['COPYUID']);

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

	// Clear internal status cache
	unset($this->data['STATUS:'.$to]);

	$result = $this->execute('UID COPY', array(
	$this->compressMessageSet($messages), $this->escape($to)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Moves message(s) from one folder to another.
	- * Original message(s) will be marked as deleted.
	*
	* @param string\|array $messages Message UID(s)
	* @param string $from Mailbox name
	* @param string $to Destination mailbox name
	*
	* @return bool True on success, False on failure
	*/
	function move($messages, $from, $to)
	{
	if (!$this->select($from)) {
	return false;
	}

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

	- $r = $this->copy($messages, $from, $to);
	+ // use MOVE command (RFC 6851)
	+ if ($this->hasCapability('MOVE')) {
	+ // Clear last COPYUID data
	+ unset($this->data['COPYUID']);

	- if ($r) {
	// Clear internal status cache
	+ unset($this->data['STATUS:'.$to]);
	unset($this->data['STATUS:'.$from]);

	- return $this->flag($from, $messages, 'DELETED');
	+ $r = $this->execute('UID MOVE', array(
	+ $this->compressMessageSet($messages), $this->escape($to)),
	+ self::COMMAND_NORESPONSE);
	+ }
	+ // use COPY + STORE +FLAGS.SILENT \Deleted + EXPUNGE
	+ else {
	+ $r = $this->copy($messages, $from, $to);
	+
	+ if ($r) {
	+ // Clear internal status cache
	+ unset($this->data['STATUS:'.$from]);
	+
	+ $r = $this->flag($from, $messages, 'DELETED');
	+
	+ if ($messages == '*') {
	+ // CLOSE+SELECT should be faster than EXPUNGE
	+ $this->close();
	+ }
	+ else {
	+ $this->expunge($from, $messages);
	+ }
	+ }
	}
	+
	return $r;
	}

	/**
	* FETCH command (RFC3501)
	*
	* @param string $mailbox Mailbox name
	* @param mixed $message_set Message(s) sequence identifier(s) or UID(s)
	* @param bool $is_uid True if $message_set contains UIDs
	* @param array $query_items FETCH command data items
	* @param string $mod_seq Modification sequence for CHANGEDSINCE (RFC4551) query
	* @param bool $vanished Enables VANISHED parameter (RFC5162) for CHANGEDSINCE query
	*
	* @return array List of rcube_message_header elements, False on error
	* @since 0.6
	*/
	function fetch($mailbox, $message_set, $is_uid = false, $query_items = array(),
	$mod_seq = null, $vanished = false)
	{
	if (!$this->select($mailbox)) {
	return false;
	}

	$message_set = $this->compressMessageSet($message_set);
	$result = array();

	$key = $this->nextTag();
	$request = $key . ($is_uid ? ' UID' : '') . " FETCH $message_set ";
	$request .= "(" . implode(' ', $query_items) . ")";

	if ($mod_seq !== null && $this->hasCapability('CONDSTORE')) {
	$request .= " (CHANGEDSINCE $mod_seq" . ($vanished ? " VANISHED" : '') .")";
	}

	if (!$this->putLine($request)) {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	return false;
	}

	do {
	$line = $this->readLine(4096);

	if (!$line)
	break;

	// Sample reply line:
	// * 321 FETCH (UID 2417 RFC822.SIZE 2730 FLAGS (\Seen)
	// INTERNALDATE "16-Nov-2008 21:08:46 +0100" BODYSTRUCTURE (...)
	// BODY[HEADER.FIELDS ...

	if (preg_match('/^\* ([0-9]+) FETCH/', $line, $m)) {
	$id = intval($m[1]);

	$result[$id] = new rcube_message_header;
	$result[$id]->id = $id;
	$result[$id]->subject = '';
	$result[$id]->messageID = 'mid:' . $id;

	$headers = null;
	$lines = array();
	$line = substr($line, strlen($m[0]) + 2);
	$ln = 0;

	// get complete entry
	while (preg_match('/\{([0-9]+)\}\r\n$/', $line, $m)) {
	$bytes = $m[1];
	$out = '';

	while (strlen($out) < $bytes) {
	$out = $this->readBytes($bytes);
	if ($out === NULL)
	break;
	$line .= $out;
	}

	$str = $this->readLine(4096);
	if ($str === false)
	break;

	$line .= $str;
	}

	// Tokenize response and assign to object properties
	while (list($name, $value) = $this->tokenizeResponse($line, 2)) {
	if ($name == 'UID') {
	$result[$id]->uid = intval($value);
	}
	else if ($name == 'RFC822.SIZE') {
	$result[$id]->size = intval($value);
	}
	else if ($name == 'RFC822.TEXT') {
	$result[$id]->body = $value;
	}
	else if ($name == 'INTERNALDATE') {
	$result[$id]->internaldate = $value;
	$result[$id]->date = $value;
	$result[$id]->timestamp = $this->StrToTime($value);
	}
	else if ($name == 'FLAGS') {
	if (!empty($value)) {
	foreach ((array)$value as $flag) {
	$flag = str_replace(array('$', '\\'), '', $flag);
	$flag = strtoupper($flag);

	$result[$id]->flags[$flag] = true;
	}
	}
	}
	else if ($name == 'MODSEQ') {
	$result[$id]->modseq = $value[0];
	}
	else if ($name == 'ENVELOPE') {
	$result[$id]->envelope = $value;
	}
	else if ($name == 'BODYSTRUCTURE' \|\| ($name == 'BODY' && count($value) > 2)) {
	if (!is_array($value[0]) && (strtolower($value[0]) == 'message' && strtolower($value[1]) == 'rfc822')) {
	$value = array($value);
	}
	$result[$id]->bodystructure = $value;
	}
	else if ($name == 'RFC822') {
	$result[$id]->body = $value;
	}
	else if ($name == 'BODY') {
	$body = $this->tokenizeResponse($line, 1);
	if ($value[0] == 'HEADER.FIELDS')
	$headers = $body;
	else if (!empty($value))
	$result[$id]->bodypart[$value[0]] = $body;
	else
	$result[$id]->body = $body;
	}
	}

	// create array with header field:data
	if (!empty($headers)) {
	$headers = explode("\n", trim($headers));
	foreach ($headers as $hid => $resln) {
	if (ord($resln[0]) <= 32) {
	$lines[$ln] .= (empty($lines[$ln]) ? '' : "\n") . trim($resln);
	} else {
	$lines[++$ln] = trim($resln);
	}
	}

	while (list($lines_key, $str) = each($lines)) {
	list($field, $string) = explode(':', $str, 2);

	$field = strtolower($field);
	$string = preg_replace('/\n[\t\s]*/', ' ', trim($string));

	switch ($field) {
	case 'date';
	$result[$id]->date = $string;
	$result[$id]->timestamp = $this->strToTime($string);
	break;
	case 'from':
	$result[$id]->from = $string;
	break;
	case 'to':
	$result[$id]->to = preg_replace('/undisclosed-recipients:[;,]*/', '', $string);
	break;
	case 'subject':
	$result[$id]->subject = $string;
	break;
	case 'reply-to':
	$result[$id]->replyto = $string;
	break;
	case 'cc':
	$result[$id]->cc = $string;
	break;
	case 'bcc':
	$result[$id]->bcc = $string;
	break;
	case 'content-transfer-encoding':
	$result[$id]->encoding = $string;
	break;
	case 'content-type':
	$ctype_parts = preg_split('/[; ]+/', $string);
	$result[$id]->ctype = strtolower(array_shift($ctype_parts));
	if (preg_match('/charset\s=\s"?([a-z0-9\-\.\_]+)"?/i', $string, $regs)) {
	$result[$id]->charset = $regs[1];
	}
	break;
	case 'in-reply-to':
	$result[$id]->in_reply_to = str_replace(array("\n", '<', '>'), '', $string);
	break;
	case 'references':
	$result[$id]->references = $string;
	break;
	case 'return-receipt-to':
	case 'disposition-notification-to':
	case 'x-confirm-reading-to':
	$result[$id]->mdn_to = $string;
	break;
	case 'message-id':
	$result[$id]->messageID = $string;
	break;
	case 'x-priority':
	if (preg_match('/^(\d+)/', $string, $matches)) {
	$result[$id]->priority = intval($matches[1]);
	}
	break;
	default:
	if (strlen($field) < 3) {
	break;
	}
	if ($result[$id]->others[$field]) {
	$string = array_merge((array)$result[$id]->others[$field], (array)$string);
	}
	$result[$id]->others[$field] = $string;
	}
	}
	}
	}

	// VANISHED response (QRESYNC RFC5162)
	// Sample: * VANISHED (EARLIER) 300:310,405,411
	else if (preg_match('/^\* VANISHED [()EARLIER]*/i', $line, $match)) {
	$line = substr($line, strlen($match[0]));
	$v_data = $this->tokenizeResponse($line, 1);

	$this->data['VANISHED'] = $v_data;
	}

	} while (!$this->startsWith($line, $key, true));

	return $result;
	}

	function fetchHeaders($mailbox, $message_set, $is_uid = false, $bodystr = false, $add = '')
	{
	$query_items = array('UID', 'RFC822.SIZE', 'FLAGS', 'INTERNALDATE');
	if ($bodystr)
	$query_items[] = 'BODYSTRUCTURE';
	$query_items[] = 'BODY.PEEK[HEADER.FIELDS ('
	. 'DATE FROM TO SUBJECT CONTENT-TYPE CC REPLY-TO LIST-POST DISPOSITION-NOTIFICATION-TO X-PRIORITY'
	. ($add ? ' ' . trim($add) : '')
	. ')]';

	$result = $this->fetch($mailbox, $message_set, $is_uid, $query_items);

	return $result;
	}

	function fetchHeader($mailbox, $id, $uidfetch=false, $bodystr=false, $add='')
	{
	$a = $this->fetchHeaders($mailbox, $id, $uidfetch, $bodystr, $add);
	if (is_array($a)) {
	return array_shift($a);
	}
	return false;
	}

	function sortHeaders($a, $field, $flag)
	{
	if (empty($field)) {
	$field = 'uid';
	}
	else {
	$field = strtolower($field);
	}

	if ($field == 'date' \|\| $field == 'internaldate') {
	$field = 'timestamp';
	}

	if (empty($flag)) {
	$flag = 'ASC';
	} else {
	$flag = strtoupper($flag);
	}

	$c = count($a);
	if ($c > 0) {
	// Strategy:
	// First, we'll create an "index" array.
	// Then, we'll use sort() on that array,
	// and use that to sort the main array.

	// create "index" array
	$index = array();
	reset($a);
	while (list($key, $val) = each($a)) {
	if ($field == 'timestamp') {
	$data = $this->strToTime($val->date);
	if (!$data) {
	$data = $val->timestamp;
	}
	} else {
	$data = $val->$field;
	if (is_string($data)) {
	$data = str_replace('"', '', $data);
	if ($field == 'subject') {
	$data = preg_replace('/^(Re: \s\|Fwd:\s\|Fw:\s*)+/i', '', $data);
	}
	$data = strtoupper($data);
	}
	}
	$index[$key] = $data;
	}

	// sort index
	if ($flag == 'ASC') {
	asort($index);
	} else {
	arsort($index);
	}

	// form new array based on index
	$result = array();
	reset($index);
	while (list($key, $val) = each($index)) {
	$result[$key] = $a[$key];
	}
	}

	return $result;
	}

	function fetchMIMEHeaders($mailbox, $uid, $parts, $mime=true)
	{
	if (!$this->select($mailbox)) {
	return false;
	}

	$result = false;
	$parts = (array) $parts;
	$key = $this->nextTag();
	$peeks = array();
	$type = $mime ? 'MIME' : 'HEADER';

	// format request
	foreach ($parts as $part) {
	$peeks[] = "BODY.PEEK[$part.$type]";
	}

	$request = "$key UID FETCH $uid (" . implode(' ', $peeks) . ')';

	// send request
	if (!$this->putLine($request)) {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	return false;
	}

	do {
	$line = $this->readLine(1024);

	if (preg_match('/^\* [0-9]+ FETCH [0-9UID( ]+BODY\[([0-9\.]+)\.'.$type.'\]/', $line, $matches)) {
	$idx = $matches[1];
	$headers = '';

	// get complete entry
	if (preg_match('/\{([0-9]+)\}\r\n$/', $line, $m)) {
	$bytes = $m[1];
	$out = '';

	while (strlen($out) < $bytes) {
	$out = $this->readBytes($bytes);
	if ($out === null)
	break;
	$headers .= $out;
	}
	}

	$result[$idx] = trim($headers);
	}
	} while (!$this->startsWith($line, $key, true));

	return $result;
	}

	function fetchPartHeader($mailbox, $id, $is_uid=false, $part=NULL)
	{
	$part = empty($part) ? 'HEADER' : $part.'.MIME';

	return $this->handlePartBody($mailbox, $id, $is_uid, $part);
	}

	function handlePartBody($mailbox, $id, $is_uid=false, $part='', $encoding=NULL, $print=NULL, $file=NULL, $formatted=false, $max_bytes=0)
	{
	if (!$this->select($mailbox)) {
	return false;
	}

	switch ($encoding) {
	case 'base64':
	$mode = 1;
	break;
	case 'quoted-printable':
	$mode = 2;
	break;
	case 'x-uuencode':
	case 'x-uue':
	case 'uue':
	case 'uuencode':
	$mode = 3;
	break;
	default:
	$mode = 0;
	}

	// Use BINARY extension when possible (and safe)
	$binary = $mode && preg_match('/^[0-9.]+$/', $part) && $this->hasCapability('BINARY');
	$fetch_mode = $binary ? 'BINARY' : 'BODY';
	$partial = $max_bytes ? sprintf('<0.%d>', $max_bytes) : '';

	// format request
	$key = $this->nextTag();
	$request = $key . ($is_uid ? ' UID' : '') . " FETCH $id ($fetch_mode.PEEK[$part]$partial)";
	$result = false;

	// send request
	if (!$this->putLine($request)) {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	return false;
	}

	if ($binary) {
	// WARNING: Use $formatting argument with care, this may break binary data stream
	$mode = -1;
	}

	do {
	$line = trim($this->readLine(1024));

	if (!$line) {
	break;
	}

	if (!preg_match('/^\* ([0-9]+) FETCH (.*)$/', $line, $m)) {
	continue;
	}

	$line = $m[2];
	$last = substr($line, -1);

	// handle one line response
	if ($line[0] == '(' && $last == ')') {
	// tokenize content inside brackets
	$tokens = $this->tokenizeResponse(preg_replace('/(^\(\|\$)/', '', $line));
	$result = count($tokens) == 1 ? $tokens[0] : false;

	if ($result !== false) {
	if ($mode == 1) {
	$result = base64_decode($result);
	}
	else if ($mode == 2) {
	$result = quoted_printable_decode($result);
	}
	else if ($mode == 3) {
	$result = convert_uudecode($result);
	}
	}
	}
	// response with string literal
	else if (preg_match('/\{([0-9]+)\}$/', $line, $m)) {
	$bytes = (int) $m[1];
	$prev = '';

	while ($bytes > 0) {
	$line = $this->readLine(8192);

	if ($line === NULL) {
	break;
	}

	$len = strlen($line);

	if ($len > $bytes) {
	$line = substr($line, 0, $bytes);
	$len = strlen($line);
	}
	$bytes -= $len;

	// BASE64
	if ($mode == 1) {
	$line = rtrim($line, "\t\r\n\0\x0B");
	// create chunks with proper length for base64 decoding
	$line = $prev.$line;
	$length = strlen($line);
	if ($length % 4) {
	$length = floor($length / 4) * 4;
	$prev = substr($line, $length);
	$line = substr($line, 0, $length);
	}
	else {
	$prev = '';
	}
	$line = base64_decode($line);
	}
	// QUOTED-PRINTABLE
	else if ($mode == 2) {
	$line = rtrim($line, "\t\r\0\x0B");
	$line = quoted_printable_decode($line);
	}
	// UUENCODE
	else if ($mode == 3) {
	$line = rtrim($line, "\t\r\n\0\x0B");
	if ($line == 'end' \|\| preg_match('/^begin\s+[0-7]+\s+.+$/', $line)) {
	continue;
	}
	$line = convert_uudecode($line);
	}
	// default
	else if ($formatted) {
	$line = rtrim($line, "\t\r\n\0\x0B") . "\n";
	}

	if ($file) {
	if (fwrite($file, $line) === false) {
	break;
	}
	}
	else if ($print) {
	echo $line;
	}
	else {
	$result .= $line;
	}
	}
	}
	} while (!$this->startsWith($line, $key, true));

	if ($result !== false) {
	if ($file) {
	return fwrite($file, $result);
	}
	else if ($print) {
	echo $result;
	return true;
	}

	return $result;
	}

	return false;
	}

	/**
	* Handler for IMAP APPEND command
	*
	* @param string $mailbox Mailbox name
	* @param string $message Message content
	* @param array $flags Message flags
	* @param string $date Message internal date
	* @param bool $binary Enable BINARY append (RFC3516)
	*
	* @return string\|bool On success APPENDUID response (if available) or True, False on failure
	*/
	function append($mailbox, &$message, $flags = array(), $date = null, $binary = false)
	{
	unset($this->data['APPENDUID']);

	if ($mailbox === null \|\| $mailbox === '') {
	return false;
	}

	$binary = $binary && $this->getCapability('BINARY');
	$literal_plus = !$binary && $this->prefs['literal+'];

	if (!$binary) {
	$message = str_replace("\r", '', $message);
	$message = str_replace("\n", "\r\n", $message);
	}

	$len = strlen($message);
	if (!$len) {
	return false;
	}

	// build APPEND command
	$key = $this->nextTag();
	$request = "$key APPEND " . $this->escape($mailbox) . ' (' . $this->flagsToStr($flags) . ')';
	if (!empty($date)) {
	$request .= ' ' . $this->escape($date);
	}
	$request .= ' ' . ($binary ? '~' : '') . '{' . $len . ($literal_plus ? '+' : '') . '}';

	// send APPEND command
	if ($this->putLine($request)) {
	// Do not wait when LITERAL+ is supported
	if (!$literal_plus) {
	$line = $this->readReply();

	if ($line[0] != '+') {
	$this->parseResult($line, 'APPEND: ');
	return false;
	}
	}

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

	do {
	$line = $this->readLine();
	} while (!$this->startsWith($line, $key, true, true));

	// Clear internal status cache
	unset($this->data['STATUS:'.$mailbox]);

	if ($this->parseResult($line, 'APPEND: ') != self::ERROR_OK)
	return false;
	else if (!empty($this->data['APPENDUID']))
	return $this->data['APPENDUID'];
	else
	return true;
	}
	else {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	}

	return false;
	}

	/**
	* Handler for IMAP APPEND command.
	*
	* @param string $mailbox Mailbox name
	* @param string $path Path to the file with message body
	* @param string $headers Message headers
	* @param array $flags Message flags
	* @param string $date Message internal date
	* @param bool $binary Enable BINARY append (RFC3516)
	*
	* @return string\|bool On success APPENDUID response (if available) or True, False on failure
	*/
	function appendFromFile($mailbox, $path, $headers=null, $flags = array(), $date = null, $binary = false)
	{
	unset($this->data['APPENDUID']);

	if ($mailbox === null \|\| $mailbox === '') {
	return false;
	}

	// open message file
	$in_fp = false;
	if (file_exists(realpath($path))) {
	$in_fp = fopen($path, 'r');
	}

	if (!$in_fp) {
	$this->setError(self::ERROR_UNKNOWN, "Couldn't open $path for reading");
	return false;
	}

	$body_separator = "\r\n\r\n";
	$len = filesize($path);

	if (!$len) {
	return false;
	}

	if ($headers) {
	$headers = preg_replace('/[\r\n]+$/', '', $headers);
	$len += strlen($headers) + strlen($body_separator);
	}

	$binary = $binary && $this->getCapability('BINARY');
	$literal_plus = !$binary && $this->prefs['literal+'];

	// build APPEND command
	$key = $this->nextTag();
	$request = "$key APPEND " . $this->escape($mailbox) . ' (' . $this->flagsToStr($flags) . ')';
	if (!empty($date)) {
	$request .= ' ' . $this->escape($date);
	}
	$request .= ' ' . ($binary ? '~' : '') . '{' . $len . ($literal_plus ? '+' : '') . '}';

	// send APPEND command
	if ($this->putLine($request)) {
	// Don't wait when LITERAL+ is supported
	if (!$literal_plus) {
	$line = $this->readReply();

	if ($line[0] != '+') {
	$this->parseResult($line, 'APPEND: ');
	return false;
	}
	}

	// send headers with body separator
	if ($headers) {
	$this->putLine($headers . $body_separator, false);
	}

	// send file
	while (!feof($in_fp) && $this->fp) {
	$buffer = fgets($in_fp, 4096);
	$this->putLine($buffer, false);
	}
	fclose($in_fp);

	if (!$this->putLine('')) { // \r\n
	return false;
	}

	// read response
	do {
	$line = $this->readLine();
	} while (!$this->startsWith($line, $key, true, true));

	// Clear internal status cache
	unset($this->data['STATUS:'.$mailbox]);

	if ($this->parseResult($line, 'APPEND: ') != self::ERROR_OK)
	return false;
	else if (!empty($this->data['APPENDUID']))
	return $this->data['APPENDUID'];
	else
	return true;
	}
	else {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $request");
	}

	return false;
	}

	/**
	* Returns QUOTA information
	*
	* @return array Quota information
	*/
	function getQuota()
	{
	/*
	* GETQUOTAROOT "INBOX"
	* QUOTAROOT INBOX user/rchijiiwa1
	* QUOTA user/rchijiiwa1 (STORAGE 654 9765)
	* OK Completed
	*/
	$result = false;
	$quota_lines = array();
	$key = $this->nextTag();
	$command = $key . ' GETQUOTAROOT INBOX';

	// get line(s) containing quota info
	if ($this->putLine($command)) {
	do {
	$line = rtrim($this->readLine(5000));
	if (preg_match('/^\* QUOTA /', $line)) {
	$quota_lines[] = $line;
	}
	} while (!$this->startsWith($line, $key, true, true));
	}
	else {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $command");
	}

	// return false if not found, parse if found
	$min_free = PHP_INT_MAX;
	foreach ($quota_lines as $key => $quota_line) {
	$quota_line = str_replace(array('(', ')'), '', $quota_line);
	$parts = explode(' ', $quota_line);
	$storage_part = array_search('STORAGE', $parts);

	if (!$storage_part) {
	continue;
	}

	$used = intval($parts[$storage_part+1]);
	$total = intval($parts[$storage_part+2]);
	$free = $total - $used;

	// return lowest available space from all quotas
	if ($free < $min_free) {
	$min_free = $free;
	$result['used'] = $used;
	$result['total'] = $total;
	$result['percent'] = min(100, round(($used/max(1,$total))*100));
	$result['free'] = 100 - $result['percent'];
	}
	}

	return $result;
	}

	/**
	* Send the SETACL command (RFC4314)
	*
	* @param string $mailbox Mailbox name
	* @param string $user User name
	* @param mixed $acl ACL string or array
	*
	* @return boolean True on success, False on failure
	*
	* @since 0.5-beta
	*/
	function setACL($mailbox, $user, $acl)
	{
	if (is_array($acl)) {
	$acl = implode('', $acl);
	}

	$result = $this->execute('SETACL', array(
	$this->escape($mailbox), $this->escape($user), strtolower($acl)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Send the DELETEACL command (RFC4314)
	*
	* @param string $mailbox Mailbox name
	* @param string $user User name
	*
	* @return boolean True on success, False on failure
	*
	* @since 0.5-beta
	*/
	function deleteACL($mailbox, $user)
	{
	$result = $this->execute('DELETEACL', array(
	$this->escape($mailbox), $this->escape($user)),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Send the GETACL command (RFC4314)
	*
	* @param string $mailbox Mailbox name
	*
	* @return array User-rights array on success, NULL on error
	* @since 0.5-beta
	*/
	function getACL($mailbox)
	{
	list($code, $response) = $this->execute('GETACL', array($this->escape($mailbox)));

	if ($code == self::ERROR_OK && preg_match('/^\* ACL /i', $response)) {
	// Parse server response (remove "* ACL ")
	$response = substr($response, 6);
	$ret = $this->tokenizeResponse($response);
	$mbox = array_shift($ret);
	$size = count($ret);

	// Create user-rights hash array
	// @TODO: consider implementing fixACL() method according to RFC4314.2.1.1
	// so we could return only standard rights defined in RFC4314,
	// excluding 'c' and 'd' defined in RFC2086.
	if ($size % 2 == 0) {
	for ($i=0; $i<$size; $i++) {
	$ret[$ret[$i]] = str_split($ret[++$i]);
	unset($ret[$i-1]);
	unset($ret[$i]);
	}
	return $ret;
	}

	$this->setError(self::ERROR_COMMAND, "Incomplete ACL response");
	return NULL;
	}

	return NULL;
	}

	/**
	* Send the LISTRIGHTS command (RFC4314)
	*
	* @param string $mailbox Mailbox name
	* @param string $user User name
	*
	* @return array List of user rights
	* @since 0.5-beta
	*/
	function listRights($mailbox, $user)
	{
	list($code, $response) = $this->execute('LISTRIGHTS', array(
	$this->escape($mailbox), $this->escape($user)));

	if ($code == self::ERROR_OK && preg_match('/^\* LISTRIGHTS /i', $response)) {
	// Parse server response (remove "* LISTRIGHTS ")
	$response = substr($response, 13);

	$ret_mbox = $this->tokenizeResponse($response, 1);
	$ret_user = $this->tokenizeResponse($response, 1);
	$granted = $this->tokenizeResponse($response, 1);
	$optional = trim($response);

	return array(
	'granted' => str_split($granted),
	'optional' => explode(' ', $optional),
	);
	}

	return NULL;
	}

	/**
	* Send the MYRIGHTS command (RFC4314)
	*
	* @param string $mailbox Mailbox name
	*
	* @return array MYRIGHTS response on success, NULL on error
	* @since 0.5-beta
	*/
	function myRights($mailbox)
	{
	list($code, $response) = $this->execute('MYRIGHTS', array($this->escape($mailbox)));

	if ($code == self::ERROR_OK && preg_match('/^\* MYRIGHTS /i', $response)) {
	// Parse server response (remove "* MYRIGHTS ")
	$response = substr($response, 11);

	$ret_mbox = $this->tokenizeResponse($response, 1);
	$rights = $this->tokenizeResponse($response, 1);

	return str_split($rights);
	}

	return NULL;
	}

	/**
	* Send the SETMETADATA command (RFC5464)
	*
	* @param string $mailbox Mailbox name
	* @param array $entries Entry-value array (use NULL value as NIL)
	*
	* @return boolean True on success, False on failure
	* @since 0.5-beta
	*/
	function setMetadata($mailbox, $entries)
	{
	if (!is_array($entries) \|\| empty($entries)) {
	$this->setError(self::ERROR_COMMAND, "Wrong argument for SETMETADATA command");
	return false;
	}

	foreach ($entries as $name => $value) {
	$entries[$name] = $this->escape($name) . ' ' . $this->escape($value);
	}

	$entries = implode(' ', $entries);
	$result = $this->execute('SETMETADATA', array(
	$this->escape($mailbox), '(' . $entries . ')'),
	self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Send the SETMETADATA command with NIL values (RFC5464)
	*
	* @param string $mailbox Mailbox name
	* @param array $entries Entry names array
	*
	* @return boolean True on success, False on failure
	*
	* @since 0.5-beta
	*/
	function deleteMetadata($mailbox, $entries)
	{
	if (!is_array($entries) && !empty($entries)) {
	$entries = explode(' ', $entries);
	}

	if (empty($entries)) {
	$this->setError(self::ERROR_COMMAND, "Wrong argument for SETMETADATA command");
	return false;
	}

	foreach ($entries as $entry) {
	$data[$entry] = NULL;
	}

	return $this->setMetadata($mailbox, $data);
	}

	/**
	* Send the GETMETADATA command (RFC5464)
	*
	* @param string $mailbox Mailbox name
	* @param array $entries Entries
	* @param array $options Command options (with MAXSIZE and DEPTH keys)
	*
	* @return array GETMETADATA result on success, NULL on error
	*
	* @since 0.5-beta
	*/
	function getMetadata($mailbox, $entries, $options=array())
	{
	if (!is_array($entries)) {
	$entries = array($entries);
	}

	// create entries string
	foreach ($entries as $idx => $name) {
	$entries[$idx] = $this->escape($name);
	}

	$optlist = '';
	$entlist = '(' . implode(' ', $entries) . ')';

	// create options string
	if (is_array($options)) {
	$options = array_change_key_case($options, CASE_UPPER);
	$opts = array();

	if (!empty($options['MAXSIZE'])) {
	$opts[] = 'MAXSIZE '.intval($options['MAXSIZE']);
	}
	if (!empty($options['DEPTH'])) {
	$opts[] = 'DEPTH '.intval($options['DEPTH']);
	}

	if ($opts) {
	$optlist = '(' . implode(' ', $opts) . ')';
	}
	}

	$optlist .= ($optlist ? ' ' : '') . $entlist;

	list($code, $response) = $this->execute('GETMETADATA', array(
	$this->escape($mailbox), $optlist));

	if ($code == self::ERROR_OK) {
	$result = array();
	$data = $this->tokenizeResponse($response);

	// The METADATA response can contain multiple entries in a single
	// response or multiple responses for each entry or group of entries
	if (!empty($data) && ($size = count($data))) {
	for ($i=0; $i<$size; $i++) {
	if (isset($mbox) && is_array($data[$i])) {
	$size_sub = count($data[$i]);
	for ($x=0; $x<$size_sub; $x++) {
	$result[$mbox][$data[$i][$x]] = $data[$i][++$x];
	}
	unset($data[$i]);
	}
	else if ($data[$i] == '*') {
	if ($data[$i+1] == 'METADATA') {
	$mbox = $data[$i+2];
	unset($data[$i]); // "*"
	unset($data[++$i]); // "METADATA"
	unset($data[++$i]); // Mailbox
	}
	// get rid of other untagged responses
	else {
	unset($mbox);
	unset($data[$i]);
	}
	}
	else if (isset($mbox)) {
	$result[$mbox][$data[$i]] = $data[++$i];
	unset($data[$i]);
	unset($data[$i-1]);
	}
	else {
	unset($data[$i]);
	}
	}
	}

	return $result;
	}

	return NULL;
	}

	/**
	* Send the SETANNOTATION command (draft-daboo-imap-annotatemore)
	*
	* @param string $mailbox Mailbox name
	* @param array $data Data array where each item is an array with
	* three elements: entry name, attribute name, value
	*
	* @return boolean True on success, False on failure
	* @since 0.5-beta
	*/
	function setAnnotation($mailbox, $data)
	{
	if (!is_array($data) \|\| empty($data)) {
	$this->setError(self::ERROR_COMMAND, "Wrong argument for SETANNOTATION command");
	return false;
	}

	foreach ($data as $entry) {
	// ANNOTATEMORE drafts before version 08 require quoted parameters
	$entries[] = sprintf('%s (%s %s)', $this->escape($entry[0], true),
	$this->escape($entry[1], true), $this->escape($entry[2], true));
	}

	$entries = implode(' ', $entries);
	$result = $this->execute('SETANNOTATION', array(
	$this->escape($mailbox), $entries), self::COMMAND_NORESPONSE);

	return ($result == self::ERROR_OK);
	}

	/**
	* Send the SETANNOTATION command with NIL values (draft-daboo-imap-annotatemore)
	*
	* @param string $mailbox Mailbox name
	* @param array $data Data array where each item is an array with
	* two elements: entry name and attribute name
	*
	* @return boolean True on success, False on failure
	*
	* @since 0.5-beta
	*/
	function deleteAnnotation($mailbox, $data)
	{
	if (!is_array($data) \|\| empty($data)) {
	$this->setError(self::ERROR_COMMAND, "Wrong argument for SETANNOTATION command");
	return false;
	}

	return $this->setAnnotation($mailbox, $data);
	}

	/**
	* Send the GETANNOTATION command (draft-daboo-imap-annotatemore)
	*
	* @param string $mailbox Mailbox name
	* @param array $entries Entries names
	* @param array $attribs Attribs names
	*
	* @return array Annotations result on success, NULL on error
	*
	* @since 0.5-beta
	*/
	function getAnnotation($mailbox, $entries, $attribs)
	{
	if (!is_array($entries)) {
	$entries = array($entries);
	}
	// create entries string
	// ANNOTATEMORE drafts before version 08 require quoted parameters
	foreach ($entries as $idx => $name) {
	$entries[$idx] = $this->escape($name, true);
	}
	$entries = '(' . implode(' ', $entries) . ')';

	if (!is_array($attribs)) {
	$attribs = array($attribs);
	}
	// create entries string
	foreach ($attribs as $idx => $name) {
	$attribs[$idx] = $this->escape($name, true);
	}
	$attribs = '(' . implode(' ', $attribs) . ')';

	list($code, $response) = $this->execute('GETANNOTATION', array(
	$this->escape($mailbox), $entries, $attribs));

	if ($code == self::ERROR_OK) {
	$result = array();
	$data = $this->tokenizeResponse($response);

	// Here we returns only data compatible with METADATA result format
	if (!empty($data) && ($size = count($data))) {
	for ($i=0; $i<$size; $i++) {
	$entry = $data[$i];
	if (isset($mbox) && is_array($entry)) {
	$attribs = $entry;
	$entry = $last_entry;
	}
	else if ($entry == '*') {
	if ($data[$i+1] == 'ANNOTATION') {
	$mbox = $data[$i+2];
	unset($data[$i]); // "*"
	unset($data[++$i]); // "ANNOTATION"
	unset($data[++$i]); // Mailbox
	}
	// get rid of other untagged responses
	else {
	unset($mbox);
	unset($data[$i]);
	}
	continue;
	}
	else if (isset($mbox)) {
	$attribs = $data[++$i];
	}
	else {
	unset($data[$i]);
	continue;
	}

	if (!empty($attribs)) {
	for ($x=0, $len=count($attribs); $x<$len;) {
	$attr = $attribs[$x++];
	$value = $attribs[$x++];
	if ($attr == 'value.priv') {
	$result[$mbox]['/private' . $entry] = $value;
	}
	else if ($attr == 'value.shared') {
	$result[$mbox]['/shared' . $entry] = $value;
	}
	}
	}
	$last_entry = $entry;
	unset($data[$i]);
	}
	}

	return $result;
	}

	return NULL;
	}

	/**
	* Returns BODYSTRUCTURE for the specified message.
	*
	* @param string $mailbox Folder name
	* @param int $id Message sequence number or UID
	* @param bool $is_uid True if $id is an UID
	*
	* @return array/bool Body structure array or False on error.
	* @since 0.6
	*/
	function getStructure($mailbox, $id, $is_uid = false)
	{
	$result = $this->fetch($mailbox, $id, $is_uid, array('BODYSTRUCTURE'));
	if (is_array($result)) {
	$result = array_shift($result);
	return $result->bodystructure;
	}
	return false;
	}

	/**
	* Returns data of a message part according to specified structure.
	*
	* @param array $structure Message structure (getStructure() result)
	* @param string $part Message part identifier
	*
	* @return array Part data as hash array (type, encoding, charset, size)
	*/
	static function getStructurePartData($structure, $part)
	{
	$part_a = self::getStructurePartArray($structure, $part);
	$data = array();

	if (empty($part_a)) {
	return $data;
	}

	// content-type
	if (is_array($part_a[0])) {
	$data['type'] = 'multipart';
	}
	else {
	$data['type'] = strtolower($part_a[0]);

	// encoding
	$data['encoding'] = strtolower($part_a[5]);

	// charset
	if (is_array($part_a[2])) {
	while (list($key, $val) = each($part_a[2])) {
	if (strcasecmp($val, 'charset') == 0) {
	$data['charset'] = $part_a[2][$key+1];
	break;
	}
	}
	}
	}

	// size
	$data['size'] = intval($part_a[6]);

	return $data;
	}

	static function getStructurePartArray($a, $part)
	{
	if (!is_array($a)) {
	return false;
	}

	if (empty($part)) {
	return $a;
	}

	$ctype = is_string($a[0]) && is_string($a[1]) ? $a[0] . '/' . $a[1] : '';

	if (strcasecmp($ctype, 'message/rfc822') == 0) {
	$a = $a[8];
	}

	if (strpos($part, '.') > 0) {
	$orig_part = $part;
	$pos = strpos($part, '.');
	$rest = substr($orig_part, $pos+1);
	$part = substr($orig_part, 0, $pos);

	return self::getStructurePartArray($a[$part-1], $rest);
	}
	else if ($part > 0) {
	return (is_array($a[$part-1])) ? $a[$part-1] : $a;
	}
	}

	/**
	* Creates next command identifier (tag)
	*
	* @return string Command identifier
	* @since 0.5-beta
	*/
	function nextTag()
	{
	$this->cmd_num++;
	$this->cmd_tag = sprintf('A%04d', $this->cmd_num);

	return $this->cmd_tag;
	}

	/**
	* Sends IMAP command and parses result
	*
	* @param string $command IMAP command
	* @param array $arguments Command arguments
	* @param int $options Execution options
	*
	* @return mixed Response code or list of response code and data
	* @since 0.5-beta
	*/
	function execute($command, $arguments=array(), $options=0)
	{
	$tag = $this->nextTag();
	$query = $tag . ' ' . $command;
	$noresp = ($options & self::COMMAND_NORESPONSE);
	$response = $noresp ? null : '';

	if (!empty($arguments)) {
	foreach ($arguments as $arg) {
	$query .= ' ' . self::r_implode($arg);
	}
	}

	// Send command
	if (!$this->putLineC($query)) {
	$this->setError(self::ERROR_COMMAND, "Unable to send command: $query");
	return $noresp ? self::ERROR_COMMAND : array(self::ERROR_COMMAND, '');
	}

	// Parse response
	do {
	$line = $this->readLine(4096);
	if ($response !== null) {
	$response .= $line;
	}
	} while (!$this->startsWith($line, $tag . ' ', true, true));

	$code = $this->parseResult($line, $command . ': ');

	// Remove last line from response
	if ($response) {
	$line_len = min(strlen($response), strlen($line) + 2);
	$response = substr($response, 0, -$line_len);
	}

	// optional CAPABILITY response
	if (($options & self::COMMAND_CAPABILITY) && $code == self::ERROR_OK
	&& preg_match('/\[CAPABILITY ([^]]+)\]/i', $line, $matches)
	) {
	$this->parseCapability($matches[1], true);
	}

	// return last line only (without command tag, result and response code)
	if ($line && ($options & self::COMMAND_LASTLINE)) {
	$response = preg_replace("/^$tag (OK\|NO\|BAD\|BYE\|PREAUTH)?\s(\[[a-z-]+\])?\s/i", '', trim($line));
	}

	return $noresp ? $code : array($code, $response);
	}

	/**
	* Splits IMAP response into string tokens
	*
	* @param string &$str The IMAP's server response
	* @param int $num Number of tokens to return
	*
	* @return mixed Tokens array or string if $num=1
	* @since 0.5-beta
	*/
	static function tokenizeResponse(&$str, $num=0)
	{
	$result = array();

	while (!$num \|\| count($result) < $num) {
	// remove spaces from the beginning of the string
	$str = ltrim($str);

	switch ($str[0]) {

	// String literal
	case '{':
	if (($epos = strpos($str, "}\r\n", 1)) == false) {
	// error
	}
	if (!is_numeric(($bytes = substr($str, 1, $epos - 1)))) {
	// error
	}
	$result[] = $bytes ? substr($str, $epos + 3, $bytes) : '';
	// Advance the string
	$str = substr($str, $epos + 3 + $bytes);
	break;

	// Quoted string
	case '"':
	$len = strlen($str);

	for ($pos=1; $pos<$len; $pos++) {
	if ($str[$pos] == '"') {
	break;
	}
	if ($str[$pos] == "\\") {
	if ($str[$pos + 1] == '"' \|\| $str[$pos + 1] == "\\") {
	$pos++;
	}
	}
	}
	if ($str[$pos] != '"') {
	// error
	}
	// we need to strip slashes for a quoted string
	$result[] = stripslashes(substr($str, 1, $pos - 1));
	$str = substr($str, $pos + 1);
	break;

	// Parenthesized list
	case '(':
	case '[':
	$str = substr($str, 1);
	$result[] = self::tokenizeResponse($str);
	break;
	case ')':
	case ']':
	$str = substr($str, 1);
	return $result;
	break;

	// String atom, number, NIL, *, %
	default:
	// empty string
	if ($str === '' \|\| $str === null) {
	break 2;
	}

	// excluded chars: SP, CTL, ), [, ]
	if (preg_match('/^([^\x00-\x20\x29\x5B\x5D\x7F]+)/', $str, $m)) {
	$result[] = $m[1] == 'NIL' ? NULL : $m[1];
	$str = substr($str, strlen($m[1]));
	}
	break;
	}
	}

	return $num == 1 ? $result[0] : $result;
	}

	static function r_implode($element)
	{
	$string = '';

	if (is_array($element)) {
	reset($element);
	while (list($key, $value) = each($element)) {
	$string .= ' ' . self::r_implode($value);
	}
	}
	else {
	return $element;
	}

	return '(' . trim($string) . ')';
	}

	/**
	* Converts message identifiers array into sequence-set syntax
	*
	* @param array $messages Message identifiers
	* @param bool $force Forces compression of any size
	*
	* @return string Compressed sequence-set
	*/
	static function compressMessageSet($messages, $force=false)
	{
	// given a comma delimited list of independent mid's,
	// compresses by grouping sequences together

	if (!is_array($messages)) {
	// if less than 255 bytes long, let's not bother
	if (!$force && strlen($messages)<255) {
	return $messages;
	- }
	+ }

	// see if it's already been compressed
	if (strpos($messages, ':') !== false) {
	return $messages;
	}

	// separate, then sort
	$messages = explode(',', $messages);
	}

	sort($messages);

	$result = array();
	$start = $prev = $messages[0];

	foreach ($messages as $id) {
	$incr = $id - $prev;
	if ($incr > 1) { // found a gap
	if ($start == $prev) {
	$result[] = $prev; // push single id
	} else {
	$result[] = $start . ':' . $prev; // push sequence as start_id:end_id
	}
	$start = $id; // start of new sequence
	}
	$prev = $id;
	}

	// handle the last sequence/id
	if ($start == $prev) {
	$result[] = $prev;
	} else {
	$result[] = $start.':'.$prev;
	}

	// return as comma separated string
	return implode(',', $result);
	}

	/**
	* Converts message sequence-set into array
	*
	* @param string $messages Message identifiers
	*
	* @return array List of message identifiers
	*/
	static function uncompressMessageSet($messages)
	{
	if (empty($messages)) {
	return array();
	}

	$result = array();
	$messages = explode(',', $messages);

	foreach ($messages as $idx => $part) {
	$items = explode(':', $part);
	$max = max($items[0], $items[1]);

	for ($x=$items[0]; $x<=$max; $x++) {
	$result[] = (int)$x;
	}
	unset($messages[$idx]);
	}

	return $result;
	}

	private function _xor($string, $string2)
	{
	$result = '';
	$size = strlen($string);

	for ($i=0; $i<$size; $i++) {
	$result .= chr(ord($string[$i]) ^ ord($string2[$i]));
	}

	return $result;
	}

	/**
	* Converts flags array into string for inclusion in IMAP command
	*
	* @param array $flags Flags (see self::flags)
	*
	* @return string Space-separated list of flags
	*/
	private function flagsToStr($flags)
	{
	foreach ((array)$flags as $idx => $flag) {
	if ($flag = $this->flags[strtoupper($flag)]) {
	$flags[$idx] = $flag;
	}
	}

	return implode(' ', (array)$flags);
	}

	/**
	* Converts datetime string into unix timestamp
	*
	* @param string $date Date string
	*
	* @return int Unix timestamp
	*/
	static function strToTime($date)
	{
	// support non-standard "GMTXXXX" literal
	$date = preg_replace('/GMT\s*([+-][0-9]+)/', '\\1', $date);

	// if date parsing fails, we have a date in non-rfc format
	// remove token from the end and try again
	while (($ts = intval(@strtotime($date))) <= 0) {
	$d = explode(' ', $date);
	array_pop($d);
	if (empty($d)) {
	break;
	}
	$date = implode(' ', $d);
	}

	return $ts < 0 ? 0 : $ts;
	}

	/**
	* CAPABILITY response parser
	*/
	private function parseCapability($str, $trusted=false)
	{
	$str = preg_replace('/^\* CAPABILITY /i', '', $str);

	$this->capability = explode(' ', strtoupper($str));

	if (!isset($this->prefs['literal+']) && in_array('LITERAL+', $this->capability)) {
	$this->prefs['literal+'] = true;
	}

	if ($trusted) {
	$this->capability_readed = true;
	}
	}

	/**
	* Escapes a string when it contains special characters (RFC3501)
	*
	* @param string $string IMAP string
	* @param boolean $force_quotes Forces string quoting (for atoms)
	*
	* @return string String atom, quoted-string or string literal
	* @todo lists
	*/
	static function escape($string, $force_quotes=false)
	{
	if ($string === null) {
	return 'NIL';
	}

	if ($string === '') {
	return '""';
	}

	// atom-string (only safe characters)
	if (!$force_quotes && !preg_match('/[\x00-\x20\x22\x25\x28-\x2A\x5B-\x5D\x7B\x7D\x80-\xFF]/', $string)) {
	return $string;
	}

	// quoted-string
	if (!preg_match('/[\r\n\x00\x80-\xFF]/', $string)) {
	return '"' . addcslashes($string, '\\"') . '"';
	}

	// literal-string
	return sprintf("{%d}\r\n%s", strlen($string), $string);
	}

	/**
	* Set the value of the debugging flag.
	*
	* @param boolean $debug New value for the debugging flag.
	*
	* @since 0.5-stable
	*/
	function setDebug($debug, $handler = null)
	{
	$this->_debug = $debug;
	$this->_debug_handler = $handler;
	}

	/**
	* Write the given debug text to the current debug output handler.
	*
	* @param string $message Debug mesage text.
	*
	* @since 0.5-stable
	*/
	private function debug($message)
	{
	if ($this->resourceid) {
	$message = sprintf('[%s] %s', $this->resourceid, $message);
	}

	if ($this->_debug_handler) {
	call_user_func_array($this->_debug_handler, array(&$this, $message));
	} else {
	echo "DEBUG: $message\n";
	}
	}

	}

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