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