functions/imap_utf7_local.php

   1 <?php
   2
   3 /**
   4  * imap_utf7_local.php
   5  *
   6  * Copyright (c) 1999-2003 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  * $Id$
  12  * @package squirrelmail
  13  */
  14
  15 /**
  16  * @param string $str
  17  * @param string $to_encoding
  18  * @param string $from_encoding
  19  * @param string $default_charset
  20  * @return string
  21  */
  22 function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset)
  23 {
  24   // Allows mbstring functions only with iso-8859-*, utf-8 and
  25   // iso-2022-jp (Japanese)
  26   // koi8-r and gb2312 can be added only in php 4.3+
  27   if ( stristr($default_charset, 'iso-8859-') ||
  28        stristr($default_charset, 'utf-8') ||
  29        stristr($default_charset, 'iso-2022-jp') ) {
  30     if (function_exists('mb_convert_encoding')) {
  31       return mb_convert_encoding($str, $to_encoding, $from_encoding);
  32     }
  33   }
  34   return '';
  35 }
  36
  37 function imap_utf7_encode_local($s) {
  38     global $languages, $squirrelmail_language;
  39
  40     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
  41         function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
  42         return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_encode', $s);
  43     }
  44
  45     if ($s == '')  //If empty, don't bother
  46       return '';
  47
  48     global $default_charset;
  49     set_my_charset();   //must be called before using $default_charset
  50     if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
  51       $utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset);
  52       if ($utf7_s != '')
  53         return $utf7_s;
  54     }
  55
  56     // Later code works only for ISO-8859-1
  57
  58         $b64_s = '';    // buffer for substring to be base64-encoded
  59         $utf7_s = '';   // imap-utf7-encoded string
  60         for ($i = 0; $i < strlen($s); $i++) {
  61                 $c = $s[$i];
  62                 $ord_c = ord($c);
  63                 if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or
  64                     (($ord_c >= 0x27) and ($ord_c <= 0x7e))) {
  65                         if ($b64_s) {
  66                                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-';
  67                                 $b64_s = '';
  68                         }
  69                         $utf7_s = $utf7_s . $c;
  70                 } elseif ($ord_c == 0x26) {
  71                         if ($b64_s) {
  72                                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
  73                                 $b64_s = '';
  74                         }
  75                         $utf7_s = $utf7_s . '&-';
  76                 } else {
  77                         $b64_s = $b64_s . chr(0) . $c;
  78                 }
  79         }
  80         //
  81         // flush buffer
  82         //
  83         if ($b64_s) {
  84                 $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-';
  85                 $b64_s = '';
  86         }
  87         return $utf7_s;
  88 }
  89
  90 function imap_utf7_decode_local($s) {
  91     global $languages, $squirrelmail_language;
  92
  93     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
  94         function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
  95         return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_decode', $s);
  96     }
  97
  98     if ($s == '')  //If empty, don't bother
  99       return '';
 100
 101     global $default_charset;
 102     set_my_charset();   //must be called before using $default_charset
 103     if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) {
 104       $utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset);
 105       if ($utf7_s != '')
 106         return $utf7_s;
 107     }
 108
 109     // Later code works only for ISO-8859-1
 110
 111         $b64_s = '';
 112         $iso_8859_1_s = '';
 113         for ($i = 0, $len = strlen($s); $i < $len; $i++) {
 114                 $c = $s[$i];
 115                 if (strlen($b64_s) > 0) {
 116                         if ($c == '-') {
 117                                 if ($b64_s == '&') {
 118                                         $iso_8859_1_s = $iso_8859_1_s . '&';
 119                                 } else {
 120                                         $iso_8859_1_s = $iso_8859_1_s .
 121                                           decodeBASE64(substr($b64_s, 1));
 122                                 }
 123                                 $b64_s = '';
 124                         } else {
 125                                 $b64_s = $b64_s . $c;
 126                         }
 127                 } else {
 128                         if ($c == '&') {
 129                                 $b64_s = '&';
 130                         } else {
 131                                 $iso_8859_1_s = $iso_8859_1_s . $c;
 132                         }
 133                 }
 134         }
 135         return $iso_8859_1_s;
 136 }
 137
 138 function encodeBASE64($s) {
 139         $B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,';
 140         $p = 0;         // phase: 1 / 2 / 3 / 1 / 2 / 3...
 141         $e = '';        // base64-encoded string
 142         //foreach($s as $c) {
 143         for ($i = 0; $i < strlen($s); $i++) {
 144                 $c = $s[$i];
 145                 if ($p == 0) {
 146                         $e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1);
 147                         $t = (ord($c) & 3);
 148                         $p = 1;
 149                 } elseif ($p == 1) {
 150                         $e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)];
 151                         $t = (ord($c) & 15);
 152                         $p = 2;
 153                 } elseif ($p == 2) {
 154                         $e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)];
 155                         $e = $e . $B64Chars[ord($c) & 63];
 156                         $p = 0;
 157                 }
 158         }
 159         //
 160         // flush buffer
 161         //
 162         if ($p == 1) {
 163                 $e = $e . $B64Chars[$t << 4];
 164         } elseif ($p == 2) {
 165                 $e = $e . $B64Chars[$t << 2];
 166         }
 167         return $e;
 168 }
 169
 170 function decodeBASE64($s) {
 171         $B64Values = array(
 172                 'A' =>  0, 'B' =>  1, 'C' =>  2, 'D' =>  3, 'E' =>  4, 'F' =>  5,
 173                 'G' =>  6, 'H' =>  7, 'I' =>  8, 'J' =>  9, 'K' => 10, 'L' => 11,
 174                 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17,
 175                 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23,
 176                 'Y' => 24, 'Z' => 25,
 177                 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31,
 178                 'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37,
 179                 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43,
 180                 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49,
 181                 'y' => 50, 'z' => 51,
 182                 '0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57,
 183                 '6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63
 184         );
 185         $p = 0;
 186         $d = '';
 187         $unicodeNullByteToggle = 0;
 188         for ($i = 0, $len = strlen($s); $i < $len; $i++) {
 189                 $c = $s[$i];
 190                 if ($p == 0) {
 191                         $t = $B64Values[$c];
 192                         $p = 1;
 193                 } elseif ($p == 1) {
 194                         if ($unicodeNullByteToggle) {
 195                                 $d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4));
 196                                 $unicodeNullByteToggle = 0;
 197                         } else {
 198                                 $unicodeNullByteToggle = 1;
 199                         }
 200                         $t = ($B64Values[$c] & 15);
 201                         $p = 2;
 202                 } elseif ($p == 2) {
 203                         if ($unicodeNullByteToggle) {
 204                                 $d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2));
 205                                 $unicodeNullByteToggle = 0;
 206                         } else {
 207                                 $unicodeNullByteToggle = 1;
 208                         }
 209                         $t = ($B64Values[$c] & 3);
 210                         $p = 3;
 211                 } elseif ($p == 3) {
 212                         if ($unicodeNullByteToggle) {
 213                                 $d = $d . chr(($t << 6) + $B64Values[$c]);
 214                                 $unicodeNullByteToggle = 0;
 215                         } else {
 216                                 $unicodeNullByteToggle = 1;
 217                         }
 218                         $t = ($B64Values[$c] & 3);
 219                         $p = 0;
 220                 }
 221         }
 222         return $d;
 223 }
 224
 225 ?>