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787 lines
24 KiB
PHP
787 lines
24 KiB
PHP
<?php
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/*
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+-----------------------------------------------------------------------+
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| program/include/rcube_vcard.php |
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| |
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2008-2011, The Roundcube Dev Team |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| Logical representation of a vcard address record |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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+-----------------------------------------------------------------------+
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$Id$
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*/
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/**
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* Logical representation of a vcard-based address record
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* Provides functions to parse and export vCard data format
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*
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* @package Addressbook
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* @author Thomas Bruederli <roundcube@gmail.com>
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*/
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class rcube_vcard
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{
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private static $values_decoded = false;
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private $raw = array(
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'FN' => array(),
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'N' => array(array('','','','','')),
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);
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private static $fieldmap = array(
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'phone' => 'TEL',
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'birthday' => 'BDAY',
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'website' => 'URL',
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'notes' => 'NOTE',
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'email' => 'EMAIL',
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'address' => 'ADR',
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'jobtitle' => 'TITLE',
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'department' => 'X-DEPARTMENT',
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'gender' => 'X-GENDER',
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'maidenname' => 'X-MAIDENNAME',
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'anniversary' => 'X-ANNIVERSARY',
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'assistant' => 'X-ASSISTANT',
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'manager' => 'X-MANAGER',
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'spouse' => 'X-SPOUSE',
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'edit' => 'X-AB-EDIT',
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);
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private $typemap = array('iPhone' => 'mobile', 'CELL' => 'mobile', 'WORK,FAX' => 'workfax');
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private $phonetypemap = array('HOME1' => 'HOME', 'BUSINESS1' => 'WORK', 'BUSINESS2' => 'WORK2', 'BUSINESSFAX' => 'WORK,FAX');
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private $addresstypemap = array('BUSINESS' => 'WORK');
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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');
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public $business = false;
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public $displayname;
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public $surname;
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public $firstname;
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public $middlename;
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public $nickname;
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public $organization;
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public $notes;
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public $email = array();
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public static $eol = "\r\n";
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/**
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* Constructor
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*/
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public function __construct($vcard = null, $charset = RCMAIL_CHARSET, $detect = false, $fieldmap = array())
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{
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if (!empty($fielmap))
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$this->extend_fieldmap($fieldmap);
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if (!empty($vcard))
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$this->load($vcard, $charset, $detect);
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}
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/**
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* Load record from (internal, unfolded) vcard 3.0 format
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*
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* @param string vCard string to parse
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* @param string Charset of string values
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* @param boolean True if loading a 'foreign' vcard and extra heuristics for charset detection is required
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*/
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public function load($vcard, $charset = RCMAIL_CHARSET, $detect = false)
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{
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self::$values_decoded = false;
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$this->raw = self::vcard_decode($vcard);
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// resolve charset parameters
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if ($charset == null) {
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$this->raw = self::charset_convert($this->raw);
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}
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// vcard has encoded values and charset should be detected
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else if ($detect && self::$values_decoded &&
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($detected_charset = self::detect_encoding(self::vcard_encode($this->raw))) && $detected_charset != RCMAIL_CHARSET) {
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$this->raw = self::charset_convert($this->raw, $detected_charset);
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}
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// consider FN empty if the same as the primary e-mail address
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if ($this->raw['FN'][0][0] == $this->raw['EMAIL'][0][0])
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$this->raw['FN'][0][0] = '';
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// find well-known address fields
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$this->displayname = $this->raw['FN'][0][0];
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$this->surname = $this->raw['N'][0][0];
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$this->firstname = $this->raw['N'][0][1];
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$this->middlename = $this->raw['N'][0][2];
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$this->nickname = $this->raw['NICKNAME'][0][0];
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$this->organization = $this->raw['ORG'][0][0];
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$this->business = ($this->raw['X-ABSHOWAS'][0][0] == 'COMPANY') || (join('', (array)$this->raw['N'][0]) == '' && !empty($this->organization));
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foreach ((array)$this->raw['EMAIL'] as $i => $raw_email)
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$this->email[$i] = is_array($raw_email) ? $raw_email[0] : $raw_email;
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// make the pref e-mail address the first entry in $this->email
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$pref_index = $this->get_type_index('EMAIL', 'pref');
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if ($pref_index > 0) {
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$tmp = $this->email[0];
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$this->email[0] = $this->email[$pref_index];
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$this->email[$pref_index] = $tmp;
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}
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}
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/**
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* Return vCard data as associative array to be unsed in Roundcube address books
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*
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* @return array Hash array with key-value pairs
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*/
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public function get_assoc()
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{
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$out = array('name' => $this->displayname);
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$typemap = $this->typemap;
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// copy name fields to output array
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foreach (array('firstname','surname','middlename','nickname','organization') as $col) {
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if (strlen($this->$col))
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$out[$col] = $this->$col;
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}
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if ($this->raw['N'][0][3])
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$out['prefix'] = $this->raw['N'][0][3];
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if ($this->raw['N'][0][4])
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$out['suffix'] = $this->raw['N'][0][4];
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// convert from raw vcard data into associative data for Roundcube
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foreach (array_flip(self::$fieldmap) as $tag => $col) {
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foreach ((array)$this->raw[$tag] as $i => $raw) {
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if (is_array($raw)) {
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$k = -1;
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$key = $col;
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$subtype = '';
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if (!empty($raw['type'])) {
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$combined = join(',', self::array_filter((array)$raw['type'], 'internet,pref', true));
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$subtype = $typemap[$combined] ? $typemap[$combined] : ($typemap[$raw['type'][++$k]] ? $typemap[$raw['type'][$k]] : strtolower($raw['type'][$k]));
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while ($k < count($raw['type']) && ($subtype == 'internet' || $subtype == 'pref'))
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$subtype = $typemap[$raw['type'][++$k]] ? $typemap[$raw['type'][$k]] : strtolower($raw['type'][$k]);
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}
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// read vcard 2.1 subtype
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if (!$subtype) {
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foreach ($raw as $k => $v) {
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if (!is_numeric($k) && $v === true && !in_array(strtolower($k), array('pref','internet','voice','base64'))) {
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$subtype = $typemap[$k] ? $typemap[$k] : strtolower($k);
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break;
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}
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}
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}
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// force subtype if none set
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if (!$subtype && preg_match('/^(email|phone|address|website)/', $key))
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$subtype = 'other';
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if ($subtype)
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$key .= ':' . $subtype;
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// split ADR values into assoc array
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if ($tag == 'ADR') {
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list(,, $value['street'], $value['locality'], $value['region'], $value['zipcode'], $value['country']) = $raw;
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$out[$key][] = $value;
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}
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else
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$out[$key][] = $raw[0];
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}
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else {
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$out[$col][] = $raw;
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}
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}
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}
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// handle special IM fields as used by Apple
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foreach ($this->immap as $tag => $type) {
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foreach ((array)$this->raw[$tag] as $i => $raw) {
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$out['im:'.$type][] = $raw[0];
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}
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}
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// copy photo data
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if ($this->raw['PHOTO'])
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$out['photo'] = $this->raw['PHOTO'][0][0];
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return $out;
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}
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/**
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* Convert the data structure into a vcard 3.0 string
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*/
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public function export($folded = true)
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{
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$vcard = self::vcard_encode($this->raw);
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return $folded ? self::rfc2425_fold($vcard) : $vcard;
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}
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/**
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* Clear the given fields in the loaded vcard data
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*
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* @param array List of field names to be reset
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*/
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public function reset($fields = null)
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{
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if (!$fields)
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$fields = array_merge(array_values(self::$fieldmap), array_keys($this->immap), array('FN','N','ORG','NICKNAME','EMAIL','ADR','BDAY'));
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foreach ($fields as $f)
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unset($this->raw[$f]);
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if (!$this->raw['N'])
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$this->raw['N'] = array(array('','','','',''));
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if (!$this->raw['FN'])
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$this->raw['FN'] = array();
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$this->email = array();
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}
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/**
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* Setter for address record fields
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*
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* @param string Field name
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* @param string Field value
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* @param string Type/section name
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*/
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public function set($field, $value, $type = 'HOME')
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{
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$field = strtolower($field);
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$type_uc = strtoupper($type);
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$typemap = array_flip($this->typemap);
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switch ($field) {
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case 'name':
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case 'displayname':
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$this->raw['FN'][0][0] = $value;
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break;
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case 'surname':
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$this->raw['N'][0][0] = $value;
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break;
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case 'firstname':
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$this->raw['N'][0][1] = $value;
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break;
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case 'middlename':
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$this->raw['N'][0][2] = $value;
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break;
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case 'prefix':
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$this->raw['N'][0][3] = $value;
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break;
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case 'suffix':
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$this->raw['N'][0][4] = $value;
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break;
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case 'nickname':
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$this->raw['NICKNAME'][0][0] = $value;
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break;
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case 'organization':
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$this->raw['ORG'][0][0] = $value;
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break;
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case 'photo':
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if (strpos($value, 'http:') === 0) {
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// TODO: fetch file from URL and save it locally?
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$this->raw['PHOTO'][0] = array(0 => $value, 'URL' => true);
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}
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else {
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$encoded = !preg_match('![^a-z0-9/=+-]!i', $value);
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$this->raw['PHOTO'][0] = array(0 => $encoded ? $value : base64_encode($value), 'BASE64' => true);
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}
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break;
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case 'email':
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$this->raw['EMAIL'][] = array(0 => $value, 'type' => array_filter(array('INTERNET', $type_uc)));
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$this->email[] = $value;
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break;
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case 'im':
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// save IM subtypes into extension fields
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$typemap = array_flip($this->immap);
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if ($field = $typemap[strtolower($type)])
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$this->raw[$field][] = array(0 => $value);
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break;
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case 'birthday':
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if ($val = rcube_strtotime($value))
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$this->raw['BDAY'][] = array(0 => date('Y-m-d', $val), 'value' => array('date'));
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break;
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case 'address':
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if ($this->addresstypemap[$type_uc])
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$type = $this->addresstypemap[$type_uc];
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$value = $value[0] ? $value : array('', '', $value['street'], $value['locality'], $value['region'], $value['zipcode'], $value['country']);
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// fall through if not empty
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if (!strlen(join('', $value)))
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break;
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default:
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if ($field == 'phone' && $this->phonetypemap[$type_uc])
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$type = $this->phonetypemap[$type_uc];
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if (($tag = self::$fieldmap[$field]) && (is_array($value) || strlen($value))) {
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$index = count($this->raw[$tag]);
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$this->raw[$tag][$index] = (array)$value;
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if ($type)
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$this->raw[$tag][$index]['type'] = explode(',', ($typemap[$type] ? $typemap[$type] : $type));
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}
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break;
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}
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}
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/**
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* Setter for individual vcard properties
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*
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* @param string VCard tag name
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* @param array Value-set of this vcard property
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* @param boolean Set to true if the value-set should be appended instead of replacing any existing value-set
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*/
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public function set_raw($tag, $value, $append = false)
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{
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$index = $append ? count($this->raw[$tag]) : 0;
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$this->raw[$tag][$index] = (array)$value;
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}
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/**
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* Find index with the '$type' attribute
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*
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* @param string Field name
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* @return int Field index having $type set
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*/
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private function get_type_index($field, $type = 'pref')
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{
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$result = 0;
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if ($this->raw[$field]) {
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foreach ($this->raw[$field] as $i => $data) {
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if (is_array($data['type']) && in_array_nocase('pref', $data['type']))
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$result = $i;
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}
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}
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return $result;
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}
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/**
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* Convert a whole vcard (array) to UTF-8.
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* If $force_charset is null, each member value that has a charset parameter will be converted
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*/
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private static function charset_convert($card, $force_charset = null)
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{
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foreach ($card as $key => $node) {
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foreach ($node as $i => $subnode) {
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if (is_array($subnode) && (($charset = $force_charset) || ($subnode['charset'] && ($charset = $subnode['charset'][0])))) {
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foreach ($subnode as $j => $value) {
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if (is_numeric($j) && is_string($value))
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$card[$key][$i][$j] = rcube_charset_convert($value, $charset);
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}
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unset($card[$key][$i]['charset']);
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}
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}
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}
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return $card;
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}
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/**
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* Extends fieldmap definition
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*/
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public function extend_fieldmap($map)
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{
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if (is_array($map))
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self::$fieldmap = array_merge($map, self::$fieldmap);
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}
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/**
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* Factory method to import a vcard file
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*
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* @param string vCard file content
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* @return array List of rcube_vcard objects
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*/
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public static function import($data)
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{
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$out = array();
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// check if charsets are specified (usually vcard version < 3.0 but this is not reliable)
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if (preg_match('/charset=/i', substr($data, 0, 2048)))
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$charset = null;
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// detect charset and convert to utf-8
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else if (($charset = self::detect_encoding($data)) && $charset != RCMAIL_CHARSET) {
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$data = rcube_charset_convert($data, $charset);
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$data = preg_replace(array('/^[\xFE\xFF]{2}/', '/^\xEF\xBB\xBF/', '/^\x00+/'), '', $data); // also remove BOM
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$charset = RCMAIL_CHARSET;
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}
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$vcard_block = '';
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$in_vcard_block = false;
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foreach (preg_split("/[\r\n]+/", $data) as $i => $line) {
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if ($in_vcard_block && !empty($line))
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$vcard_block .= $line . "\n";
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$line = trim($line);
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if (preg_match('/^END:VCARD$/i', $line)) {
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// parse vcard
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$obj = new rcube_vcard(self::cleanup($vcard_block), $charset, true, self::$fieldmap);
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if (!empty($obj->displayname) || !empty($obj->email))
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$out[] = $obj;
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$in_vcard_block = false;
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}
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else if (preg_match('/^BEGIN:VCARD$/i', $line)) {
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$vcard_block = $line . "\n";
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$in_vcard_block = true;
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}
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}
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return $out;
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}
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/**
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* Normalize vcard data for better parsing
|
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*
|
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* @param string vCard block
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* @return string Cleaned vcard block
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*/
|
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private static function cleanup($vcard)
|
|
{
|
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// Convert special types (like Skype) to normal type='skype' classes with this simple regex ;)
|
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$vcard = preg_replace(
|
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'/item(\d+)\.(TEL|EMAIL|URL)([^:]*?):(.*?)item\1.X-ABLabel:(?:_\$!<)?([\w-() ]*)(?:>!\$_)?./s',
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'\2;type=\5\3:\4',
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$vcard);
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|
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// convert Apple X-ABRELATEDNAMES into X-* fields for better compatibility
|
|
$vcard = preg_replace_callback(
|
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'/item(\d+)\.(X-ABRELATEDNAMES)([^:]*?):(.*?)item\1.X-ABLabel:(?:_\$!<)?([\w-() ]*)(?:>!\$_)?./s',
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array('self', 'x_abrelatednames_callback'),
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$vcard);
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|
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// Remove cruft like item1.X-AB*, item1.ADR instead of ADR, and empty lines
|
|
$vcard = preg_replace(array('/^item\d*\.X-AB.*$/m', '/^item\d*\./m', "/\n+/"), array('', '', "\n"), $vcard);
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|
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// convert X-WAB-GENDER to X-GENDER
|
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if (preg_match('/X-WAB-GENDER:(\d)/', $vcard, $matches)) {
|
|
$value = $matches[1] == '2' ? 'male' : 'female';
|
|
$vcard = preg_replace('/X-WAB-GENDER:\d/', 'X-GENDER:' . $value, $vcard);
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|
}
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// if N doesn't have any semicolons, add some
|
|
$vcard = preg_replace('/^(N:[^;\R]*)$/m', '\1;;;;', $vcard);
|
|
|
|
return $vcard;
|
|
}
|
|
|
|
private static function x_abrelatednames_callback($matches)
|
|
{
|
|
return 'X-' . strtoupper($matches[5]) . $matches[3] . ':'. $matches[4];
|
|
}
|
|
|
|
private static function rfc2425_fold_callback($matches)
|
|
{
|
|
// chunk_split string and avoid lines breaking multibyte characters
|
|
$c = 71;
|
|
$out .= substr($matches[1], 0, $c);
|
|
for ($n = $c; $c < strlen($matches[1]); $c++) {
|
|
// break if length > 75 or mutlibyte character starts after position 71
|
|
if ($n > 75 || ($n > 71 && ord($matches[1][$c]) >> 6 == 3)) {
|
|
$out .= "\r\n ";
|
|
$n = 0;
|
|
}
|
|
$out .= $matches[1][$c];
|
|
$n++;
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
public static function rfc2425_fold($val)
|
|
{
|
|
return preg_replace_callback('/([^\n]{72,})/', array('self', 'rfc2425_fold_callback'), $val);
|
|
}
|
|
|
|
|
|
/**
|
|
* Decodes a vcard block (vcard 3.0 format, unfolded)
|
|
* into an array structure
|
|
*
|
|
* @param string vCard block to parse
|
|
* @return array Raw data structure
|
|
*/
|
|
private static function vcard_decode($vcard)
|
|
{
|
|
// Perform RFC2425 line unfolding and split lines
|
|
$vcard = preg_replace(array("/\r/", "/\n\s+/"), '', $vcard);
|
|
$lines = explode("\n", $vcard);
|
|
$data = array();
|
|
|
|
for ($i=0; $i < count($lines); $i++) {
|
|
if (!preg_match('/^([^:]+):(.+)$/', $lines[$i], $line))
|
|
continue;
|
|
|
|
if (preg_match('/^(BEGIN|END)$/i', $line[1]))
|
|
continue;
|
|
|
|
// convert 2.1-style "EMAIL;internet;home:" to 3.0-style "EMAIL;TYPE=internet;TYPE=home:"
|
|
if (($data['VERSION'][0] == "2.1") && preg_match('/^([^;]+);([^:]+)/', $line[1], $regs2) && !preg_match('/^TYPE=/i', $regs2[2])) {
|
|
$line[1] = $regs2[1];
|
|
foreach (explode(';', $regs2[2]) as $prop)
|
|
$line[1] .= ';' . (strpos($prop, '=') ? $prop : 'TYPE='.$prop);
|
|
}
|
|
|
|
if (preg_match_all('/([^\\;]+);?/', $line[1], $regs2)) {
|
|
$entry = array();
|
|
$field = strtoupper($regs2[1][0]);
|
|
|
|
foreach($regs2[1] as $attrid => $attr) {
|
|
if ((list($key, $value) = explode('=', $attr)) && $value) {
|
|
$value = trim($value);
|
|
if ($key == 'ENCODING') {
|
|
// add next line(s) to value string if QP line end detected
|
|
while ($value == 'QUOTED-PRINTABLE' && preg_match('/=$/', $lines[$i]))
|
|
$line[2] .= "\n" . $lines[++$i];
|
|
|
|
$line[2] = self::decode_value($line[2], $value);
|
|
}
|
|
else
|
|
$entry[strtolower($key)] = array_merge((array)$entry[strtolower($key)], (array)self::vcard_unquote($value, ','));
|
|
}
|
|
else if ($attrid > 0) {
|
|
$entry[$key] = true; // true means attr without =value
|
|
}
|
|
}
|
|
|
|
$entry = array_merge($entry, (array)self::vcard_unquote($line[2]));
|
|
$data[$field][] = $entry;
|
|
}
|
|
}
|
|
|
|
unset($data['VERSION']);
|
|
return $data;
|
|
}
|
|
|
|
|
|
/**
|
|
* Decode a given string with the encoding rule from ENCODING attributes
|
|
*
|
|
* @param string String to decode
|
|
* @param string Encoding type (quoted-printable and base64 supported)
|
|
* @return string Decoded 8bit value
|
|
*/
|
|
private static function decode_value($value, $encoding)
|
|
{
|
|
switch (strtolower($encoding)) {
|
|
case 'quoted-printable':
|
|
self::$values_decoded = true;
|
|
return quoted_printable_decode($value);
|
|
|
|
case 'base64':
|
|
self::$values_decoded = true;
|
|
return base64_decode($value);
|
|
|
|
default:
|
|
return $value;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Encodes an entry for storage in our database (vcard 3.0 format, unfolded)
|
|
*
|
|
* @param array Raw data structure to encode
|
|
* @return string vCard encoded string
|
|
*/
|
|
static function vcard_encode($data)
|
|
{
|
|
foreach((array)$data as $type => $entries) {
|
|
/* valid N has 5 properties */
|
|
while ($type == "N" && is_array($entries[0]) && count($entries[0]) < 5)
|
|
$entries[0][] = "";
|
|
|
|
// make sure FN is not empty (required by RFC2426)
|
|
if ($type == "FN" && empty($entries))
|
|
$entries[0] = $data['EMAIL'][0][0];
|
|
|
|
foreach((array)$entries as $entry) {
|
|
$attr = '';
|
|
if (is_array($entry)) {
|
|
$value = array();
|
|
foreach($entry as $attrname => $attrvalues) {
|
|
if (is_int($attrname))
|
|
$value[] = $attrvalues;
|
|
elseif ($attrvalues === true)
|
|
$attr .= ";$attrname"; // true means just tag, not tag=value, as in PHOTO;BASE64:...
|
|
else {
|
|
foreach((array)$attrvalues as $attrvalue)
|
|
$attr .= ";$attrname=" . self::vcard_quote($attrvalue, ',');
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
$value = $entry;
|
|
}
|
|
|
|
// skip empty entries
|
|
if (self::is_empty($value))
|
|
continue;
|
|
|
|
$vcard .= self::vcard_quote($type) . $attr . ':' . self::vcard_quote($value) . self::$eol;
|
|
}
|
|
}
|
|
|
|
return 'BEGIN:VCARD' . self::$eol . 'VERSION:3.0' . self::$eol . $vcard . 'END:VCARD';
|
|
}
|
|
|
|
|
|
/**
|
|
* Join indexed data array to a vcard quoted string
|
|
*
|
|
* @param array Field data
|
|
* @param string Separator
|
|
* @return string Joined and quoted string
|
|
*/
|
|
private static function vcard_quote($s, $sep = ';')
|
|
{
|
|
if (is_array($s)) {
|
|
foreach($s as $part) {
|
|
$r[] = self::vcard_quote($part, $sep);
|
|
}
|
|
return(implode($sep, (array)$r));
|
|
}
|
|
else {
|
|
return strtr($s, array('\\' => '\\\\', "\r" => '', "\n" => '\n', ',' => '\,', ';' => '\;'));
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Split quoted string
|
|
*
|
|
* @param string vCard string to split
|
|
* @param string Separator char/string
|
|
* @return array List with splitted values
|
|
*/
|
|
private static function vcard_unquote($s, $sep = ';')
|
|
{
|
|
// break string into parts separated by $sep, but leave escaped $sep alone
|
|
if (count($parts = explode($sep, strtr($s, array("\\$sep" => "\007")))) > 1) {
|
|
foreach($parts as $s) {
|
|
$result[] = self::vcard_unquote(strtr($s, array("\007" => "\\$sep")), $sep);
|
|
}
|
|
return $result;
|
|
}
|
|
else {
|
|
return strtr($s, array("\r" => '', '\\\\' => '\\', '\n' => "\n", '\N' => "\n", '\,' => ',', '\;' => ';', '\:' => ':'));
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Check if vCard entry is empty: empty string or an array with
|
|
* all entries empty.
|
|
*
|
|
* @param mixed $value Attribute value (string or array)
|
|
*
|
|
* @return bool True if the value is empty, False otherwise
|
|
*/
|
|
private static function is_empty($value)
|
|
{
|
|
foreach ((array)$value as $v) {
|
|
if (((string)$v) !== '') {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Extract array values by a filter
|
|
*
|
|
* @param array Array to filter
|
|
* @param keys Array or comma separated list of values to keep
|
|
* @param boolean Invert key selection: remove the listed values
|
|
* @return array The filtered array
|
|
*/
|
|
private static function array_filter($arr, $values, $inverse = false)
|
|
{
|
|
if (!is_array($values))
|
|
$values = explode(',', $values);
|
|
|
|
$result = array();
|
|
$keep = array_flip((array)$values);
|
|
foreach ($arr as $key => $val)
|
|
if ($inverse != isset($keep[strtolower($val)]))
|
|
$result[$key] = $val;
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Returns UNICODE type based on BOM (Byte Order Mark)
|
|
*
|
|
* @param string Input string to test
|
|
* @return string Detected encoding
|
|
*/
|
|
private static function detect_encoding($string)
|
|
{
|
|
if (substr($string, 0, 4) == "\0\0\xFE\xFF") return 'UTF-32BE'; // Big Endian
|
|
if (substr($string, 0, 4) == "\xFF\xFE\0\0") return 'UTF-32LE'; // Little Endian
|
|
if (substr($string, 0, 2) == "\xFE\xFF") return 'UTF-16BE'; // Big Endian
|
|
if (substr($string, 0, 2) == "\xFF\xFE") return 'UTF-16LE'; // Little Endian
|
|
if (substr($string, 0, 3) == "\xEF\xBB\xBF") return 'UTF-8';
|
|
|
|
// heuristics
|
|
if ($string[0] == "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-32BE';
|
|
if ($string[0] != "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] == "\0") return 'UTF-32LE';
|
|
if ($string[0] == "\0" && $string[1] != "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-16BE';
|
|
if ($string[0] != "\0" && $string[1] == "\0" && $string[2] != "\0" && $string[3] == "\0") return 'UTF-16LE';
|
|
|
|
// use mb_detect_encoding()
|
|
$encodings = array('UTF-8', 'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3',
|
|
'ISO-8859-4', 'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9',
|
|
'ISO-8859-10', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
|
|
'WINDOWS-1252', 'WINDOWS-1251', 'BIG5', 'GB2312');
|
|
|
|
if (function_exists('mb_detect_encoding') && ($enc = mb_detect_encoding($string, $encodings)))
|
|
return $enc;
|
|
|
|
// No match, check for UTF-8
|
|
// from http://w3.org/International/questions/qa-forms-utf-8.html
|
|
if (preg_match('/\A(
|
|
[\x09\x0A\x0D\x20-\x7E]
|
|
| [\xC2-\xDF][\x80-\xBF]
|
|
| \xE0[\xA0-\xBF][\x80-\xBF]
|
|
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}
|
|
| \xED[\x80-\x9F][\x80-\xBF]
|
|
| \xF0[\x90-\xBF][\x80-\xBF]{2}
|
|
| [\xF1-\xF3][\x80-\xBF]{3}
|
|
| \xF4[\x80-\x8F][\x80-\xBF]{2}
|
|
)*\z/xs', substr($string, 0, 2048)))
|
|
return 'UTF-8';
|
|
|
|
return rcmail::get_instance()->config->get('default_charset', 'ISO-8859-1'); # fallback to Latin-1
|
|
}
|
|
|
|
}
|