githubFork/roundcubemail.git

Add groups support for LDAP address books, contributed by Andreas Dick

thomascube

2011-01-29 6039aae3878aa5880415290cbc41af4bac4fdcb5

commit \| author \| age
ed132e	1	<?php
T	2
	3	/*
	4	+-----------------------------------------------------------------------+
	5	\| program/include/rcube_vcard.php \|
	6	\| \|
e019f2	7	\| This file is part of the Roundcube Webmail client \|
0501b6	8	\| Copyright (C) 2008-2011, The Roundcube Dev Team \|
ed132e	9	\| Licensed under the GNU GPL \|
T	10	\| \|
	11	\| PURPOSE: \|
	12	\| Logical representation of a vcard address record \|
	13	+-----------------------------------------------------------------------+
	14	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	15	+-----------------------------------------------------------------------+
	16
1d786c	17	$Id$
ed132e	18
T	19	*/
	20
	21
	22	/**
	23	* Logical representation of a vcard-based address record
	24	* Provides functions to parse and export vCard data format
	25	*
	26	* @package Addressbook
	27	* @author Thomas Bruederli <roundcube@gmail.com>
	28	*/
	29	class rcube_vcard
	30	{
6bdb61	31	private static $values_decoded = false;
0dbac3	32	private $raw = array(
T	33	'FN' => array(),
	34	'N' => array(array('','','','','')),
	35	);
0501b6	36	private $fieldmap = array(
T	37	'phone' => 'TEL',
	38	'birthday' => 'BDAY',
	39	'website' => 'URL',
	40	'notes' => 'NOTE',
	41	'email' => 'EMAIL',
	42	'address' => 'ADR',
	43	'gender' => 'X-GENDER',
	44	'maidenname' => 'X-MAIDENNAME',
	45	'anniversary' => 'X-ANNIVERSARY',
	46	'assistant' => 'X-ASSISTANT',
	47	'manager' => 'X-MANAGER',
	48	'spouse' => 'X-SPOUSE',
	49	);
	50	private $typemap = array('iPhone' => 'mobile', 'CELL' => 'mobile');
	51	private $phonetypemap = array('HOME1' => 'HOME', 'BUSINESS1' => 'WORK', 'BUSINESS2' => 'WORK2', 'WORKFAX' => 'BUSINESSFAX');
	52	private $addresstypemap = array('BUSINESS' => 'WORK');
	53	private $immap = array('X-JABBER' => 'jabber', 'X-ICQ' => 'icq', 'X-MSN' => 'msn', 'X-AIM' => 'aim', 'X-YAHOO' => 'yahoo', 'X-SKYPE' => 'skype', 'X-SKYPE-USERNAME' => 'skype');
ed132e	54
T	55	public $business = false;
	56	public $displayname;
	57	public $surname;
	58	public $firstname;
	59	public $middlename;
	60	public $nickname;
	61	public $organization;
	62	public $notes;
	63	public $email = array();
	64
	65
	66	/**
	67	* Constructor
	68	*/
6bdb61	69	public function __construct($vcard = null, $charset = RCMAIL_CHARSET, $detect = false)
ed132e	70	{
T	71	if (!empty($vcard))
6bdb61	72	$this->load($vcard, $charset, $detect);
ed132e	73	}
T	74
	75
	76	/**
	77	* Load record from (internal, unfolded) vcard 3.0 format
	78	*
	79	* @param string vCard string to parse
6bdb61	80	* @param string Charset of string values
T	81	* @param boolean True if loading a 'foreign' vcard and extra heuristics for charset detection is required
ed132e	82	*/
6bdb61	83	public function load($vcard, $charset = RCMAIL_CHARSET, $detect = false)
ed132e	84	{
6bdb61	85	self::$values_decoded = false;
ed132e	86	$this->raw = self::vcard_decode($vcard);
6bdb61	87
5570ad	88	// resolve charset parameters
6bdb61	89	if ($charset == null) {
T	90	$this->raw = self::charset_convert($this->raw);
	91	}
	92	// vcard has encoded values and charset should be detected
	93	else if ($detect && self::$values_decoded &&
	94	($detected_charset = self::detect_encoding(self::vcard_encode($this->raw))) && $detected_charset != RCMAIL_CHARSET) {
	95	$this->raw = self::charset_convert($this->raw, $detected_charset);
	96	}
ed132e	97
T	98	// find well-known address fields
5570ad	99	$this->displayname = $this->raw['FN'][0][0];
ed132e	100	$this->surname = $this->raw['N'][0][0];
T	101	$this->firstname = $this->raw['N'][0][1];
	102	$this->middlename = $this->raw['N'][0][2];
5570ad	103	$this->nickname = $this->raw['NICKNAME'][0][0];
T	104	$this->organization = $this->raw['ORG'][0][0];
	105	$this->business = ($this->raw['X-ABSHOWAS'][0][0] == 'COMPANY') \|\| (join('', (array)$this->raw['N'][0]) == '' && !empty($this->organization));
ed132e	106
T	107	foreach ((array)$this->raw['EMAIL'] as $i => $raw_email)
bb8781	108	$this->email[$i] = is_array($raw_email) ? $raw_email[0] : $raw_email;
ed132e	109
T	110	// make the pref e-mail address the first entry in $this->email
	111	$pref_index = $this->get_type_index('EMAIL', 'pref');
	112	if ($pref_index > 0) {
	113	$tmp = $this->email[0];
	114	$this->email[0] = $this->email[$pref_index];
	115	$this->email[$pref_index] = $tmp;
	116	}
c56f1f	117
A	118	// make sure displayname is not empty (required by RFC2426)
	119	if (!strlen($this->displayname)) {
	120	// the same method is used in steps/mail/addcontact.inc
	121	$this->displayname = ucfirst(preg_replace('/[\.\-]/', ' ',
	122	substr($this->email[0], 0, strpos($this->email[0], '@'))));
	123	}
ed132e	124	}
T	125
	126
	127	/**
0501b6	128	* Return vCard data as associative array to be unsed in Roundcube address books
T	129	*
	130	* @return array Hash array with key-value pairs
	131	*/
	132	public function get_assoc()
	133	{
	134	$out = array('name' => $this->displayname);
	135	$typemap = $this->typemap;
	136
	137	// copy name fields to output array
	138	foreach (array('firstname','surname','middlename','nickname','organization') as $col)
	139	$out[$col] = $this->$col;
	140
	141	$out['prefix'] = $this->raw['N'][0][3];
	142	$out['suffix'] = $this->raw['N'][0][4];
	143
	144	// convert from raw vcard data into associative data for Roundcube
	145	foreach (array_flip($this->fieldmap) as $tag => $col) {
	146	foreach ((array)$this->raw[$tag] as $i => $raw) {
	147	if (is_array($raw)) {
	148	$k = -1;
	149	$key = $col;
e9aa8c	150
0501b6	151	$subtype = $typemap[$raw['type'][++$k]] ? $typemap[$raw['type'][$k]] : strtolower($raw['type'][$k]);
T	152	while ($k < count($raw['type']) && ($subtype == 'internet' \|\| $subtype == 'pref'))
	153	$subtype = $typemap[$raw['type'][++$k]] ? $typemap[$raw['type'][$k]] : strtolower($raw['type'][$k]);
e9aa8c	154
T	155	// read vcard 2.1 subtype
	156	if (!$subtype) {
	157	foreach ($raw as $k => $v) {
	158	if (!is_numeric($k) && $v === true && !in_array(strtolower($k), array('pref','internet','voice','base64'))) {
	159	$subtype = $typemap[$k] ? $typemap[$k] : strtolower($k);
	160	break;
	161	}
	162	}
	163	}
	164
0501b6	165	if ($subtype)
T	166	$key .= ':' . $subtype;
	167
	168	// split ADR values into assoc array
	169	if ($tag == 'ADR') {
	170	list(,, $value['street'], $value['locality'], $value['region'], $value['zipcode'], $value['country']) = $raw;
	171	$out[$key][] = $value;
	172	}
	173	else
	174	$out[$key][] = $raw[0];
	175	}
	176	else {
	177	$out[$col][] = $raw;
	178	}
	179	}
	180	}
	181
	182	// handle special IM fields as used by Apple
	183	foreach ($this->immap as $tag => $type) {
	184	foreach ((array)$this->raw[$tag] as $i => $raw) {
	185	$out['im:'.$type][] = $raw[0];
	186	}
	187	}
	188
	189	// copy photo data
	190	if ($this->raw['PHOTO'])
	191	$out['photo'] = $this->raw['PHOTO'][0][0];
	192
	193	return $out;
	194	}
	195
	196
	197	/**
ed132e	198	* Convert the data structure into a vcard 3.0 string
T	199	*/
	200	public function export()
	201	{
	202	return self::rfc2425_fold(self::vcard_encode($this->raw));
0501b6	203	}
T	204
	205
	206	/**
	207	* Clear the given fields in the loaded vcard data
	208	*
	209	* @param array List of field names to be reset
	210	*/
	211	public function reset($fields = null)
	212	{
	213	if (!$fields)
	214	$fields = array_merge(array_values($this->fieldmap), array_keys($this->immap), array('FN','N','ORG','NICKNAME','EMAIL','ADR','BDAY'));
	215
	216	foreach ($fields as $f)
	217	unset($this->raw[$f]);
	218
	219	if (!$this->raw['N'])
	220	$this->raw['N'] = array(array('','','','',''));
	221	if (!$this->raw['FN'])
	222	$this->raw['FN'] = array();
	223
	224	$this->email = array();
ed132e	225	}
T	226
	227
	228	/**
	229	* Setter for address record fields
	230	*
	231	* @param string Field name
	232	* @param string Field value
0501b6	233	* @param string Type/section name
ed132e	234	*/
0501b6	235	public function set($field, $value, $type = 'HOME')
ed132e	236	{
0501b6	237	$field = strtolower($field);
T	238	$type = strtoupper($type);
	239	$typemap = array_flip($this->typemap);
	240
ed132e	241	switch ($field) {
T	242	case 'name':
	243	case 'displayname':
5570ad	244	$this->raw['FN'][0][0] = $value;
ed132e	245	break;
T	246
0501b6	247	case 'surname':
T	248	$this->raw['N'][0][0] = $value;
	249	break;
	250
ed132e	251	case 'firstname':
T	252	$this->raw['N'][0][1] = $value;
	253	break;
	254
0501b6	255	case 'middlename':
T	256	$this->raw['N'][0][2] = $value;
ed132e	257	break;
0501b6	258
T	259	case 'prefix':
	260	$this->raw['N'][0][3] = $value;
	261	break;
	262
	263	case 'suffix':
	264	$this->raw['N'][0][4] = $value;
	265	break;
	266
ed132e	267	case 'nickname':
5570ad	268	$this->raw['NICKNAME'][0][0] = $value;
ed132e	269	break;
T	270
	271	case 'organization':
5570ad	272	$this->raw['ORG'][0][0] = $value;
ed132e	273	break;
T	274
0501b6	275	case 'photo':
T	276	$encoded = !preg_match('![^a-z0-9/=+-]!i', $value);
	277	$this->raw['PHOTO'][0] = array(0 => $encoded ? $value : base64_encode($value), 'BASE64' => true);
	278	break;
	279
ed132e	280	case 'email':
0501b6	281	$this->raw['EMAIL'][] = array(0 => $value, 'type' => array_filter(array('INTERNET', $type)));
T	282	$this->email[] = $value;
	283	break;
	284
	285	case 'im':
	286	// save IM subtypes into extension fields
	287	$typemap = array_flip($this->immap);
	288	if ($field = $typemap[strtolower($type)])
	289	$this->raw[$field][] = array(0 => $value);
	290	break;
	291
	292	case 'birthday':
e9aa8c	293	if ($val = rcube_strtotime($value))
0501b6	294	$this->raw['BDAY'][] = array(0 => date('Y-m-d', $val), 'value' => array('date'));
T	295	break;
	296
	297	case 'address':
	298	if ($this->addresstypemap[$type])
	299	$type = $this->addresstypemap[$type];
	300
	301	$value = $value[0] ? $value : array('', '', $value['street'], $value['locality'], $value['region'], $value['zipcode'], $value['country']);
	302
	303	// fall through if not empty
	304	if (!strlen(join('', $value)))
	305	break;
	306
	307	default:
	308	if ($field == 'phone' && $this->phonetypemap[$type])
	309	$type = $this->phonetypemap[$type];
	310
	311	if (($tag = $this->fieldmap[$field]) && (is_array($value) \|\| strlen($value))) {
	312	$index = count($this->raw[$tag]);
	313	$this->raw[$tag][$index] = (array)$value;
	314	if ($type)
	315	$this->raw[$tag][$index]['type'] = array(($typemap[$type] ? $typemap[$type] : $type));
ed132e	316	}
T	317	break;
	318	}
	319	}
	320
	321
	322	/**
	323	* Find index with the '$type' attribute
	324	*
	325	* @param string Field name
	326	* @return int Field index having $type set
	327	*/
	328	private function get_type_index($field, $type = 'pref')
	329	{
	330	$result = 0;
	331	if ($this->raw[$field]) {
	332	foreach ($this->raw[$field] as $i => $data) {
	333	if (is_array($data['type']) && in_array_nocase('pref', $data['type']))
	334	$result = $i;
	335	}
	336	}
	337
	338	return $result;
	339	}
5570ad	340
T	341
	342	/**
	343	* Convert a whole vcard (array) to UTF-8.
6bdb61	344	* If $force_charset is null, each member value that has a charset parameter will be converted
5570ad	345	*/
6bdb61	346	private static function charset_convert($card, $force_charset = null)
5570ad	347	{
T	348	foreach ($card as $key => $node) {
	349	foreach ($node as $i => $subnode) {
6bdb61	350	if (is_array($subnode) && (($charset = $force_charset) \|\| ($subnode['charset'] && ($charset = $subnode['charset'][0])))) {
5570ad	351	foreach ($subnode as $j => $value) {
T	352	if (is_numeric($j) && is_string($value))
	353	$card[$key][$i][$j] = rcube_charset_convert($value, $charset);
	354	}
	355	unset($card[$key][$i]['charset']);
	356	}
	357	}
	358	}
	359
	360	return $card;
	361	}
ed132e	362
T	363
	364	/**
	365	* Factory method to import a vcard file
	366	*
	367	* @param string vCard file content
	368	* @return array List of rcube_vcard objects
	369	*/
	370	public static function import($data)
	371	{
	372	$out = array();
	373
5570ad	374	// check if charsets are specified (usually vcard version < 3.0 but this is not reliable)
T	375	if (preg_match('/charset=/i', substr($data, 0, 2048)))
	376	$charset = null;
ed132e	377	// detect charset and convert to utf-8
5570ad	378	else if (($charset = self::detect_encoding($data)) && $charset != RCMAIL_CHARSET) {
T	379	$data = rcube_charset_convert($data, $charset);
6fa87f	380	$data = preg_replace(array('/^[\xFE\xFF]{2}/', '/^\xEF\xBB\xBF/', '/^\x00+/'), '', $data); // also remove BOM
5570ad	381	$charset = RCMAIL_CHARSET;
ed132e	382	}
T	383
	384	$vcard_block = '';
	385	$in_vcard_block = false;
	386
	387	foreach (preg_split("/[\r\n]+/", $data) as $i => $line) {
	388	if ($in_vcard_block && !empty($line))
	389	$vcard_block .= $line . "\n";
	390
928bca	391	$line = trim($line);
A	392
	393	if (preg_match('/^END:VCARD$/i', $line)) {
ed132e	394	// parse vcard
6bdb61	395	$obj = new rcube_vcard(self::cleanup($vcard_block), $charset, true);
ed132e	396	if (!empty($obj->displayname))
T	397	$out[] = $obj;
	398
	399	$in_vcard_block = false;
	400	}
928bca	401	else if (preg_match('/^BEGIN:VCARD$/i', $line)) {
ed132e	402	$vcard_block = $line . "\n";
T	403	$in_vcard_block = true;
	404	}
	405	}
	406
	407	return $out;
	408	}
	409
	410
	411	/**
	412	* Normalize vcard data for better parsing
	413	*
	414	* @param string vCard block
	415	* @return string Cleaned vcard block
	416	*/
	417	private static function cleanup($vcard)
	418	{
	419	// Convert special types (like Skype) to normal type='skype' classes with this simple regex ;)
	420	$vcard = preg_replace(
	421	'/item(\d+)\.(TEL\|URL)([^:]?):(.?)item\1.X-ABLabel:(?:_\$!<)?([\w-() ]*)(?:>!\$_)?./s',
	422	'\2;type=\5\3:\4',
	423	$vcard);
	424
	425	// Remove cruft like item1.X-AB*, item1.ADR instead of ADR, and empty lines
	426	$vcard = preg_replace(array('/^item\d\.X-AB.$/m', '/^item\d*\./m', "/\n+/"), array('', '', "\n"), $vcard);
e9aa8c	427
T	428	// convert X-WAB-GENDER to X-GENDER
	429	if (preg_match('/X-WAB-GENDER:(\d)/', $vcard, $matches)) {
	430	$value = $matches[1] == '2' ? 'male' : 'female';
	431	$vcard = preg_replace('/X-WAB-GENDER:\d/', 'X-GENDER:' . $value, $vcard);
	432	}
ed132e	433
b58f11	434	// if N doesn't have any semicolons, add some
T	435	$vcard = preg_replace('/^(N:[^;\R]*)$/m', '\1;;;;', $vcard);
ed132e	436
T	437	return $vcard;
	438	}
	439
478c7c	440	private static function rfc2425_fold_callback($matches)
A	441	{
	442	return ":\n ".rtrim(chunk_split($matches[1], 72, "\n "));
	443	}
ed132e	444
T	445	private static function rfc2425_fold($val)
	446	{
5e6815	447	return preg_replace_callback('/:([^\n]{72,})/', array('self', 'rfc2425_fold_callback'), $val) . "\n";
ed132e	448	}
T	449
	450
	451	/**
	452	* Decodes a vcard block (vcard 3.0 format, unfolded)
	453	* into an array structure
	454	*
	455	* @param string vCard block to parse
	456	* @return array Raw data structure
	457	*/
	458	private static function vcard_decode($vcard)
	459	{
	460	// Perform RFC2425 line unfolding
	461	$vcard = preg_replace(array("/\r/", "/\n\s+/"), '', $vcard);
	462
b58f11	463	$lines = preg_split('/\r?\n/', $vcard);
ed132e	464	$data = array();
b58f11	465
T	466	for ($i=0; $i < count($lines); $i++) {
	467	if (!preg_match('/^([^\\:]*):(.+)$/', $lines[$i], $line))
	468	continue;
ed132e	469
b58f11	470	// convert 2.1-style "EMAIL;internet;home:" to 3.0-style "EMAIL;TYPE=internet;TYPE=home:"
T	471	if (($data['VERSION'][0] == "2.1") && preg_match('/^([^;]+);([^:]+)/', $line[1], $regs2) && !preg_match('/^TYPE=/i', $regs2[2])) {
	472	$line[1] = $regs2[1];
	473	foreach (explode(';', $regs2[2]) as $prop)
	474	$line[1] .= ';' . (strpos($prop, '=') ? $prop : 'TYPE='.$prop);
ed132e	475	}
T	476
cc97ea	477	if (!preg_match('/^(BEGIN\|END)$/i', $line[1]) && preg_match_all('/([^\\;]+);?/', $line[1], $regs2)) {
93af15	478	$entry = array();
cc97ea	479	$field = strtoupper($regs2[1][0]);
b58f11	480
T	481	foreach($regs2[1] as $attrid => $attr) {
	482	if ((list($key, $value) = explode('=', $attr)) && $value) {
5570ad	483	$value = trim($value);
b58f11	484	if ($key == 'ENCODING') {
93af15	485	// add next line(s) to value string if QP line end detected
23a2ee	486	while ($value == 'QUOTED-PRINTABLE' && preg_match('/=$/', $lines[$i]))
b58f11	487	$line[2] .= "\n" . $lines[++$i];
T	488
	489	$line[2] = self::decode_value($line[2], $value);
	490	}
	491	else
	492	$entry[strtolower($key)] = array_merge((array)$entry[strtolower($key)], (array)self::vcard_unquote($value, ','));
	493	}
	494	else if ($attrid > 0) {
93af15	495	$entry[$key] = true; // true means attr without =value
b58f11	496	}
T	497	}
	498
93af15	499	$entry = array_merge($entry, (array)self::vcard_unquote($line[2]));
5570ad	500	$data[$field][] = $entry;
b58f11	501	}
ed132e	502	}
b58f11	503
T	504	unset($data['VERSION']);
ed132e	505	return $data;
T	506	}
	507
	508
	509	/**
	510	* Split quoted string
	511	*
	512	* @param string vCard string to split
	513	* @param string Separator char/string
	514	* @return array List with splitted values
	515	*/
	516	private static function vcard_unquote($s, $sep = ';')
	517	{
	518	// break string into parts separated by $sep, but leave escaped $sep alone
	519	if (count($parts = explode($sep, strtr($s, array("\\$sep" => "\007")))) > 1) {
	520	foreach($parts as $s) {
	521	$result[] = self::vcard_unquote(strtr($s, array("\007" => "\\$sep")), $sep);
	522	}
	523	return $result;
	524	}
	525	else {
	526	return strtr($s, array("\r" => '', '\\\\' => '\\', '\n' => "\n", '\,' => ',', '\;' => ';', '\:' => ':'));
bb8781	527	}
T	528	}
	529
	530
	531	/**
	532	* Decode a given string with the encoding rule from ENCODING attributes
	533	*
	534	* @param string String to decode
	535	* @param string Encoding type (quoted-printable and base64 supported)
	536	* @return string Decoded 8bit value
	537	*/
	538	private static function decode_value($value, $encoding)
	539	{
	540	switch (strtolower($encoding)) {
	541	case 'quoted-printable':
6bdb61	542	self::$values_decoded = true;
bb8781	543	return quoted_printable_decode($value);
T	544
	545	case 'base64':
6bdb61	546	self::$values_decoded = true;
bb8781	547	return base64_decode($value);
T	548
	549	default:
	550	return $value;
ed132e	551	}
T	552	}
	553
	554
	555	/**
	556	* Encodes an entry for storage in our database (vcard 3.0 format, unfolded)
	557	*
	558	* @param array Raw data structure to encode
	559	* @return string vCard encoded string
	560	*/
	561	static function vcard_encode($data)
	562	{
	563	foreach((array)$data as $type => $entries) {
	564	/* valid N has 5 properties */
b58f11	565	while ($type == "N" && is_array($entries[0]) && count($entries[0]) < 5)
ed132e	566	$entries[0][] = "";
T	567
	568	foreach((array)$entries as $entry) {
	569	$attr = '';
	570	if (is_array($entry)) {
	571	$value = array();
	572	foreach($entry as $attrname => $attrvalues) {
	573	if (is_int($attrname))
	574	$value[] = $attrvalues;
	575	elseif ($attrvalues === true)
93af15	576	$attr .= ";$attrname"; // true means just tag, not tag=value, as in PHOTO;BASE64:...
ed132e	577	else {
T	578	foreach((array)$attrvalues as $attrvalue)
	579	$attr .= ";$attrname=" . self::vcard_quote($attrvalue, ',');
	580	}
	581	}
	582	}
	583	else {
	584	$value = $entry;
	585	}
	586
	587	$vcard .= self::vcard_quote($type) . $attr . ':' . self::vcard_quote($value) . "\n";
	588	}
	589	}
	590
0dbac3	591	return "BEGIN:VCARD\nVERSION:3.0\n{$vcard}END:VCARD";
ed132e	592	}
T	593
	594
	595	/**
	596	* Join indexed data array to a vcard quoted string
	597	*
	598	* @param array Field data
	599	* @param string Separator
	600	* @return string Joined and quoted string
	601	*/
	602	private static function vcard_quote($s, $sep = ';')
	603	{
	604	if (is_array($s)) {
	605	foreach($s as $part) {
	606	$r[] = self::vcard_quote($part, $sep);
	607	}
	608	return(implode($sep, (array)$r));
	609	}
	610	else {
	611	return strtr($s, array('\\' => '\\\\', "\r" => '', "\n" => '\n', ';' => '\;', ':' => '\:'));
	612	}
	613	}
	614
	615
	616	/**
	617	* Returns UNICODE type based on BOM (Byte Order Mark)
	618	*
	619	* @param string Input string to test
	620	* @return string Detected encoding
	621	*/
	622	private static function detect_encoding($string)
	623	{
	624	if (substr($string, 0, 4) == "\0\0\xFE\xFF") return 'UTF-32BE'; // Big Endian
	625	if (substr($string, 0, 4) == "\xFF\xFE\0\0") return 'UTF-32LE'; // Little Endian
	626	if (substr($string, 0, 2) == "\xFE\xFF") return 'UTF-16BE'; // Big Endian
	627	if (substr($string, 0, 2) == "\xFF\xFE") return 'UTF-16LE'; // Little Endian
	628	if (substr($string, 0, 3) == "\xEF\xBB\xBF") return 'UTF-8';
	629
6fa87f	630	// use mb_detect_encoding()
T	631	$encodings = array('UTF-8', 'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3',
	632	'ISO-8859-4', 'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9',
	633	'ISO-8859-10', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
	634	'WINDOWS-1252', 'WINDOWS-1251', 'BIG5', 'GB2312');
	635
ae9124	636	if (function_exists('mb_detect_encoding') && ($enc = mb_detect_encoding($string, $encodings)))
abdc58	637	return $enc;
A	638
ed132e	639	// No match, check for UTF-8
T	640	// from http://w3.org/International/questions/qa-forms-utf-8.html
	641	if (preg_match('/\A(
	642	[\x09\x0A\x0D\x20-\x7E]
	643	\| [\xC2-\xDF][\x80-\xBF]
	644	\| \xE0[\xA0-\xBF][\x80-\xBF]
	645	\| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}
	646	\| \xED[\x80-\x9F][\x80-\xBF]
	647	\| \xF0[\x90-\xBF][\x80-\xBF]{2}
	648	\| [\xF1-\xF3][\x80-\xBF]{3}
	649	\| \xF4[\x80-\x8F][\x80-\xBF]{2}
	650	)*\z/xs', substr($string, 0, 2048)))
	651	return 'UTF-8';
	652
ae9124	653	return rcmail::get_instance()->config->get('default_charset', 'ISO-8859-1'); # fallback to Latin-1
ed132e	654	}
T	655
	656	}
	657
	658