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1 | <?php |
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2 | |
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3 | /** |
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4 | * functions/imap_utf7_local.php - utf7-imap functions |
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5 | * |
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6 | * This implements all functions that do imap UTF7 conversions. |
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7 | * Before 1.3.2 functions were stored in imap_utf7_decode_local.php and |
8 | * imap_utf7_encode_local.php files. |
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9 | * |
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10 | * @copyright 1999-2011 The SquirrelMail Project Team |
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11 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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12 | * @version $Id$ |
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13 | * @package squirrelmail |
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14 | * @subpackage imap |
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15 | * @since 1.3.2 |
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16 | */ |
17 | |
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18 | /** |
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19 | * Function that uses php mbstring functions to convert from and to utf7-imap charset |
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20 | * |
21 | * Since 1.5.1 list of supported charsets depends sq_mb_list_encoding function. |
22 | * Before that it was hardcoded to iso-8859-x, utf-8 and iso-2022-jp. |
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23 | * @param string $str folder name |
24 | * @param string $to_encoding name of resulting charset |
25 | * @param string $from_encoding name of original charset |
26 | * @param string $default_charset default charset used by translation. |
27 | * @return string encoded folder name or '' |
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28 | * @since 1.4.2 |
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29 | */ |
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30 | function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset) { |
31 | $supported_encodings=sq_mb_list_encodings(); |
32 | if ( in_array(strtolower($default_charset),$supported_encodings) && |
33 | function_exists('mb_convert_encoding')) { |
34 | return mb_convert_encoding($str, $to_encoding, $from_encoding); |
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35 | } |
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36 | return ''; |
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37 | } |
38 | |
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39 | /** |
40 | * encode folder name to utf7-imap |
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41 | * |
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42 | * If mbstring functions do not support charset used by translation, falls back to iso-8859-1 |
43 | * @param string $s folder name |
44 | * @return string utf7-imap encoded folder name |
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45 | * @since 1.2.7 |
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46 | */ |
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47 | function imap_utf7_encode_local($s) { |
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48 | global $languages, $squirrelmail_language; |
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49 | |
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50 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
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51 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'].'_utf7_imap_encode')) { |
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52 | return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_encode', $s); |
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53 | } |
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54 | |
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55 | if ($s == '') //If empty, don't bother |
56 | return ''; |
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57 | |
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58 | global $default_charset; |
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59 | set_my_charset(); //must be called before using $default_charset |
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60 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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61 | $utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset); |
62 | if ($utf7_s != '') |
63 | return $utf7_s; |
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64 | } |
65 | |
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66 | // Later code works only for ISO-8859-1 |
67 | |
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68 | $b64_s = ''; // buffer for substring to be base64-encoded |
69 | $utf7_s = ''; // imap-utf7-encoded string |
70 | for ($i = 0; $i < strlen($s); $i++) { |
71 | $c = $s[$i]; |
72 | $ord_c = ord($c); |
73 | if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or |
74 | (($ord_c >= 0x27) and ($ord_c <= 0x7e))) { |
75 | if ($b64_s) { |
76 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-'; |
77 | $b64_s = ''; |
78 | } |
79 | $utf7_s = $utf7_s . $c; |
80 | } elseif ($ord_c == 0x26) { |
81 | if ($b64_s) { |
82 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
83 | $b64_s = ''; |
84 | } |
85 | $utf7_s = $utf7_s . '&-'; |
86 | } else { |
87 | $b64_s = $b64_s . chr(0) . $c; |
88 | } |
89 | } |
90 | // |
91 | // flush buffer |
92 | // |
93 | if ($b64_s) { |
94 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
95 | $b64_s = ''; |
96 | } |
97 | return $utf7_s; |
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98 | } |
99 | |
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100 | /** |
101 | * converts folder name from utf7-imap to charset used by translation |
102 | * |
103 | * If mbstring functions do not support charset used by translation, falls back to iso-8859-1 |
104 | * @param string $s folder name in utf7-imap |
105 | * @return string folder name in charset used by translation |
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106 | * @since 1.2.7 |
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107 | */ |
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108 | function imap_utf7_decode_local($s) { |
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109 | global $languages, $squirrelmail_language; |
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110 | |
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111 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
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112 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode')) { |
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113 | return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode', $s); |
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114 | } |
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115 | |
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116 | if ($s == '') //If empty, don't bother |
117 | return ''; |
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118 | |
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119 | global $default_charset; |
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120 | set_my_charset(); //must be called before using $default_charset |
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121 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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122 | $utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset); |
123 | if ($utf7_s != '') |
124 | return $utf7_s; |
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125 | } |
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126 | |
127 | // Later code works only for ISO-8859-1 |
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128 | |
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129 | $b64_s = ''; |
130 | $iso_8859_1_s = ''; |
131 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
132 | $c = $s[$i]; |
133 | if (strlen($b64_s) > 0) { |
134 | if ($c == '-') { |
135 | if ($b64_s == '&') { |
136 | $iso_8859_1_s = $iso_8859_1_s . '&'; |
137 | } else { |
138 | $iso_8859_1_s = $iso_8859_1_s . |
139 | decodeBASE64(substr($b64_s, 1)); |
140 | } |
141 | $b64_s = ''; |
142 | } else { |
143 | $b64_s = $b64_s . $c; |
144 | } |
145 | } else { |
146 | if ($c == '&') { |
147 | $b64_s = '&'; |
148 | } else { |
149 | $iso_8859_1_s = $iso_8859_1_s . $c; |
150 | } |
151 | } |
152 | } |
153 | return $iso_8859_1_s; |
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154 | } |
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155 | /** |
156 | * Converts string to base64 |
157 | * @param string $s string |
158 | * @return string base64 encoded string |
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159 | * @since 1.2.7 |
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160 | */ |
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161 | function encodeBASE64($s) { |
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162 | $B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,'; |
163 | $p = 0; // phase: 1 / 2 / 3 / 1 / 2 / 3... |
164 | $e = ''; // base64-encoded string |
165 | //foreach($s as $c) { |
166 | for ($i = 0; $i < strlen($s); $i++) { |
167 | $c = $s[$i]; |
168 | if ($p == 0) { |
169 | $e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1); |
170 | $t = (ord($c) & 3); |
171 | $p = 1; |
172 | } elseif ($p == 1) { |
173 | $e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)]; |
174 | $t = (ord($c) & 15); |
175 | $p = 2; |
176 | } elseif ($p == 2) { |
177 | $e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)]; |
178 | $e = $e . $B64Chars[ord($c) & 63]; |
179 | $p = 0; |
180 | } |
181 | } |
182 | // |
183 | // flush buffer |
184 | // |
185 | if ($p == 1) { |
186 | $e = $e . $B64Chars[$t << 4]; |
187 | } elseif ($p == 2) { |
188 | $e = $e . $B64Chars[$t << 2]; |
189 | } |
190 | return $e; |
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191 | } |
192 | |
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193 | /** |
194 | * Converts string from base64 |
195 | * @param string $s base64 encoded string |
196 | * @return string decoded string |
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197 | * @since 1.2.7 |
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198 | */ |
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199 | function decodeBASE64($s) { |
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200 | $B64Values = array( |
201 | 'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5, |
202 | 'G' => 6, 'H' => 7, 'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11, |
203 | 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17, |
204 | 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23, |
205 | 'Y' => 24, 'Z' => 25, |
206 | 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31, |
207 | 'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37, |
208 | 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43, |
209 | 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49, |
210 | 'y' => 50, 'z' => 51, |
211 | '0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57, |
212 | '6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63 |
213 | ); |
214 | $p = 0; |
215 | $d = ''; |
216 | $unicodeNullByteToggle = 0; |
217 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
218 | $c = $s[$i]; |
219 | if ($p == 0) { |
220 | $t = $B64Values[$c]; |
221 | $p = 1; |
222 | } elseif ($p == 1) { |
223 | if ($unicodeNullByteToggle) { |
224 | $d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4)); |
225 | $unicodeNullByteToggle = 0; |
226 | } else { |
227 | $unicodeNullByteToggle = 1; |
228 | } |
229 | $t = ($B64Values[$c] & 15); |
230 | $p = 2; |
231 | } elseif ($p == 2) { |
232 | if ($unicodeNullByteToggle) { |
233 | $d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2)); |
234 | $unicodeNullByteToggle = 0; |
235 | } else { |
236 | $unicodeNullByteToggle = 1; |
237 | } |
238 | $t = ($B64Values[$c] & 3); |
239 | $p = 3; |
240 | } elseif ($p == 3) { |
241 | if ($unicodeNullByteToggle) { |
242 | $d = $d . chr(($t << 6) + $B64Values[$c]); |
243 | $unicodeNullByteToggle = 0; |
244 | } else { |
245 | $unicodeNullByteToggle = 1; |
246 | } |
247 | $t = ($B64Values[$c] & 3); |
248 | $p = 0; |
249 | } |
250 | } |
251 | return $d; |
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252 | } |