functions/imap_utf7_local.php

   1 <?php
   2
   3 /**
   4  * imap_utf7_local.php
   5  *
   6  * Copyright (c) 1999-2004 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This implements all functions that do imap UTF7 conversions.
  10  *
  11  * @version $Id$
  12  * @package squirrelmail
  13  * @subpackage imap
  14  */
  15
  16 /**
  17  * @param string $str
  18  * @param string $to_encoding
  19  * @param string $from_encoding
  20  * @param string $default_charset
  21  * @return string
  22  */
  23 function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset)
  24 {
  25   // Allows mbstring functions only with iso-8859-*, utf-8 and
  26   // iso-2022-jp (Japanese)
  27   // koi8-r and gb2312 can be added only in php 4.3+
  28   if ( stristr($default_charset, 'iso-8859-') ||
  29        stristr($default_charset, 'utf-8') ||
  30        stristr($default_charset, 'iso-2022-jp') ) {
  31     if (function_exists('mb_convert_encoding')) {
  32       return mb_convert_encoding($str, $to_encoding, $from_encoding);
  33     }
  34   }
  35   return '';
  36 }
  37
  38 function imap_utf7_encode_local($s) {
  39     global $languages, $squirrelmail_language;
  40
  41     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
  42         function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
  43         return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_encode', $s);
  44     }
  45
  46     if ($s == '')  //If empty, don't bother
  47       return '';
  48
  49     global $default_charset;
  50     set_my_charset();   //must be called before using $default_charset
  51     if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
  52       $utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset);
  53       if ($utf7_s != '')
  54         return $utf7_s;
  55     }
  56
  57     // Later code works only for ISO-8859-1
  58
  59         $b64_s = '';    // buffer for substring to be base64-encoded
  60         $utf7_s = '';   // imap-utf7-encoded string
  61         for ($i = 0; $i < strlen($s); $i++) {
  62                 $c = $s[$i];
  63                 $ord_c = ord($c);
  64                 if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or
  65                     (($ord_c >= 0x27) and ($ord_c <= 0x7e))) {
  66                         if ($b64_s) {
  67                                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-';
  68                                 $b64_s = '';
  69                         }
  70                         $utf7_s = $utf7_s . $c;
  71                 } elseif ($ord_c == 0x26) {
  72                         if ($b64_s) {
  73                                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
  74                                 $b64_s = '';
  75                         }
  76                         $utf7_s = $utf7_s . '&-';
  77                 } else {
  78                         $b64_s = $b64_s . chr(0) . $c;
  79                 }
  80         }
  81         //
  82         // flush buffer
  83         //
  84         if ($b64_s) {
  85                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
  86                 $b64_s = '';
  87         }
  88         return $utf7_s;
  89 }
  90
  91 function imap_utf7_decode_local($s) {
  92     global $languages, $squirrelmail_language;
  93
  94     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
  95         function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
  96         return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_decode', $s);
  97     }
  98
  99     if ($s == '')  //If empty, don't bother
 100       return '';
 101
 102     global $default_charset;
 103     set_my_charset();   //must be called before using $default_charset
 104     if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
 105       $utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset);
 106       if ($utf7_s != '')
 107         return $utf7_s;
 108     }
 109
 110     // Later code works only for ISO-8859-1
 111
 112         $b64_s = '';
 113         $iso_8859_1_s = '';
 114         for ($i = 0, $len = strlen($s); $i < $len; $i++) {
 115                 $c = $s[$i];
 116                 if (strlen($b64_s) > 0) {
 117                         if ($c == '-') {
 118                                 if ($b64_s == '&') {
 119                                         $iso_8859_1_s = $iso_8859_1_s . '&';
 120                                 } else {
 121                                         $iso_8859_1_s = $iso_8859_1_s .
 122                                           decodeBASE64(substr($b64_s, 1));
 123                                 }
 124                                 $b64_s = '';
 125                         } else {
 126                                 $b64_s = $b64_s . $c;
 127                         }
 128                 } else {
 129                         if ($c == '&') {
 130                                 $b64_s = '&';
 131                         } else {
 132                                 $iso_8859_1_s = $iso_8859_1_s . $c;
 133                         }
 134                 }
 135         }
 136         return $iso_8859_1_s;
 137 }
 138
 139 function encodeBASE64($s) {
 140         $B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,';
 141         $p = 0;         // phase: 1 / 2 / 3 / 1 / 2 / 3...
 142         $e = '';        // base64-encoded string
 143         //foreach($s as $c) {
 144         for ($i = 0; $i < strlen($s); $i++) {
 145                 $c = $s[$i];
 146                 if ($p == 0) {
 147                         $e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1);
 148                         $t = (ord($c) & 3);
 149                         $p = 1;
 150                 } elseif ($p == 1) {
 151                         $e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)];
 152                         $t = (ord($c) & 15);
 153                         $p = 2;
 154                 } elseif ($p == 2) {
 155                         $e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)];
 156                         $e = $e . $B64Chars[ord($c) & 63];
 157                         $p = 0;
 158                 }
 159         }
 160         //
 161         // flush buffer
 162         //
 163         if ($p == 1) {
 164                 $e = $e . $B64Chars[$t << 4];
 165         } elseif ($p == 2) {
 166                 $e = $e . $B64Chars[$t << 2];
 167         }
 168         return $e;
 169 }
 170
 171 function decodeBASE64($s) {
 172         $B64Values = array(
 173                 'A' =>  0, 'B' =>  1, 'C' =>  2, 'D' =>  3, 'E' =>  4, 'F' =>  5,
 174                 'G' =>  6, 'H' =>  7, 'I' =>  8, 'J' =>  9, 'K' => 10, 'L' => 11,
 175                 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17,
 176                 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23,
 177                 'Y' => 24, 'Z' => 25,
 178                 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31,
 179                 'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37,
 180                 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43,
 181                 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49,
 182                 'y' => 50, 'z' => 51,
 183                 '0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57,
 184                 '6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63
 185         );
 186         $p = 0;
 187         $d = '';
 188         $unicodeNullByteToggle = 0;
 189         for ($i = 0, $len = strlen($s); $i < $len; $i++) {
 190                 $c = $s[$i];
 191                 if ($p == 0) {
 192                         $t = $B64Values[$c];
 193                         $p = 1;
 194                 } elseif ($p == 1) {
 195                         if ($unicodeNullByteToggle) {
 196                                 $d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4));
 197                                 $unicodeNullByteToggle = 0;
 198                         } else {
 199                                 $unicodeNullByteToggle = 1;
 200                         }
 201                         $t = ($B64Values[$c] & 15);
 202                         $p = 2;
 203                 } elseif ($p == 2) {
 204                         if ($unicodeNullByteToggle) {
 205                                 $d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2));
 206                                 $unicodeNullByteToggle = 0;
 207                         } else {
 208                                 $unicodeNullByteToggle = 1;
 209                         }
 210                         $t = ($B64Values[$c] & 3);
 211                         $p = 3;
 212                 } elseif ($p == 3) {
 213                         if ($unicodeNullByteToggle) {
 214                                 $d = $d . chr(($t << 6) + $B64Values[$c]);
 215                                 $unicodeNullByteToggle = 0;
 216                         } else {
 217                                 $unicodeNullByteToggle = 1;
 218                         }
 219                         $t = ($B64Values[$c] & 3);
 220                         $p = 0;
 221                 }
 222         }
 223         return $d;
 224 }
 225
 226 ?>