functions/imap_utf7_local.php

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