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1 | <?php |
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2 | /** |
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3 | * functions/imap_utf7_local.php - utf7-imap functions |
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4 | * |
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5 | * Copyright (c) 1999-2004 The SquirrelMail Project Team |
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6 | * Licensed under the GNU GPL. For full terms see the file COPYING. |
7 | * |
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8 | * This implements all functions that do imap UTF7 conversions. |
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9 | * |
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10 | * @version $Id$ |
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11 | * @package squirrelmail |
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12 | * @subpackage imap |
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13 | */ |
14 | |
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15 | /** |
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16 | * Function that uses php mbstring functions to convert from and to utf7-imap charset |
17 | * @param string $str folder name |
18 | * @param string $to_encoding name of resulting charset |
19 | * @param string $from_encoding name of original charset |
20 | * @param string $default_charset default charset used by translation. |
21 | * @return string encoded folder name or '' |
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22 | */ |
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23 | function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset) { |
24 | $supported_encodings=sq_mb_list_encodings(); |
25 | if ( in_array(strtolower($default_charset),$supported_encodings) && |
26 | function_exists('mb_convert_encoding')) { |
27 | return mb_convert_encoding($str, $to_encoding, $from_encoding); |
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28 | } |
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29 | return ''; |
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30 | } |
31 | |
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32 | /** |
33 | * encode folder name to utf7-imap |
34 | * |
35 | * If mbstring functions do not support charset used by translation, falls back to iso-8859-1 |
36 | * @param string $s folder name |
37 | * @return string utf7-imap encoded folder name |
38 | */ |
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39 | function imap_utf7_encode_local($s) { |
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40 | global $languages, $squirrelmail_language; |
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41 | |
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42 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
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43 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'].'_utf7_imap_encode')) { |
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44 | return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_encode', $s); |
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45 | } |
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46 | |
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47 | if ($s == '') //If empty, don't bother |
48 | return ''; |
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49 | |
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50 | global $default_charset; |
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51 | set_my_charset(); //must be called before using $default_charset |
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52 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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53 | $utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset); |
54 | if ($utf7_s != '') |
55 | return $utf7_s; |
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56 | } |
57 | |
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58 | // Later code works only for ISO-8859-1 |
59 | |
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60 | $b64_s = ''; // buffer for substring to be base64-encoded |
61 | $utf7_s = ''; // imap-utf7-encoded string |
62 | for ($i = 0; $i < strlen($s); $i++) { |
63 | $c = $s[$i]; |
64 | $ord_c = ord($c); |
65 | if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or |
66 | (($ord_c >= 0x27) and ($ord_c <= 0x7e))) { |
67 | if ($b64_s) { |
68 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-'; |
69 | $b64_s = ''; |
70 | } |
71 | $utf7_s = $utf7_s . $c; |
72 | } elseif ($ord_c == 0x26) { |
73 | if ($b64_s) { |
74 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
75 | $b64_s = ''; |
76 | } |
77 | $utf7_s = $utf7_s . '&-'; |
78 | } else { |
79 | $b64_s = $b64_s . chr(0) . $c; |
80 | } |
81 | } |
82 | // |
83 | // flush buffer |
84 | // |
85 | if ($b64_s) { |
86 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
87 | $b64_s = ''; |
88 | } |
89 | return $utf7_s; |
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90 | } |
91 | |
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92 | /** |
93 | * converts folder name from utf7-imap to charset used by translation |
94 | * |
95 | * If mbstring functions do not support charset used by translation, falls back to iso-8859-1 |
96 | * @param string $s folder name in utf7-imap |
97 | * @return string folder name in charset used by translation |
98 | */ |
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99 | function imap_utf7_decode_local($s) { |
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100 | global $languages, $squirrelmail_language; |
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101 | |
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102 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
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103 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode')) { |
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104 | return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_utf7_imap_decode', $s); |
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105 | } |
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106 | |
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107 | if ($s == '') //If empty, don't bother |
108 | return ''; |
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109 | |
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110 | global $default_charset; |
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111 | set_my_charset(); //must be called before using $default_charset |
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112 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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113 | $utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset); |
114 | if ($utf7_s != '') |
115 | return $utf7_s; |
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116 | } |
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117 | |
118 | // Later code works only for ISO-8859-1 |
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119 | |
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120 | $b64_s = ''; |
121 | $iso_8859_1_s = ''; |
122 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
123 | $c = $s[$i]; |
124 | if (strlen($b64_s) > 0) { |
125 | if ($c == '-') { |
126 | if ($b64_s == '&') { |
127 | $iso_8859_1_s = $iso_8859_1_s . '&'; |
128 | } else { |
129 | $iso_8859_1_s = $iso_8859_1_s . |
130 | decodeBASE64(substr($b64_s, 1)); |
131 | } |
132 | $b64_s = ''; |
133 | } else { |
134 | $b64_s = $b64_s . $c; |
135 | } |
136 | } else { |
137 | if ($c == '&') { |
138 | $b64_s = '&'; |
139 | } else { |
140 | $iso_8859_1_s = $iso_8859_1_s . $c; |
141 | } |
142 | } |
143 | } |
144 | return $iso_8859_1_s; |
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145 | } |
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146 | /** |
147 | * Converts string to base64 |
148 | * @param string $s string |
149 | * @return string base64 encoded string |
150 | */ |
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151 | function encodeBASE64($s) { |
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152 | $B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,'; |
153 | $p = 0; // phase: 1 / 2 / 3 / 1 / 2 / 3... |
154 | $e = ''; // base64-encoded string |
155 | //foreach($s as $c) { |
156 | for ($i = 0; $i < strlen($s); $i++) { |
157 | $c = $s[$i]; |
158 | if ($p == 0) { |
159 | $e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1); |
160 | $t = (ord($c) & 3); |
161 | $p = 1; |
162 | } elseif ($p == 1) { |
163 | $e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)]; |
164 | $t = (ord($c) & 15); |
165 | $p = 2; |
166 | } elseif ($p == 2) { |
167 | $e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)]; |
168 | $e = $e . $B64Chars[ord($c) & 63]; |
169 | $p = 0; |
170 | } |
171 | } |
172 | // |
173 | // flush buffer |
174 | // |
175 | if ($p == 1) { |
176 | $e = $e . $B64Chars[$t << 4]; |
177 | } elseif ($p == 2) { |
178 | $e = $e . $B64Chars[$t << 2]; |
179 | } |
180 | return $e; |
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181 | } |
182 | |
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183 | /** |
184 | * Converts string from base64 |
185 | * @param string $s base64 encoded string |
186 | * @return string decoded string |
187 | */ |
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188 | function decodeBASE64($s) { |
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189 | $B64Values = array( |
190 | 'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5, |
191 | 'G' => 6, 'H' => 7, 'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11, |
192 | 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17, |
193 | 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23, |
194 | 'Y' => 24, 'Z' => 25, |
195 | 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31, |
196 | 'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37, |
197 | 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43, |
198 | 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49, |
199 | 'y' => 50, 'z' => 51, |
200 | '0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57, |
201 | '6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63 |
202 | ); |
203 | $p = 0; |
204 | $d = ''; |
205 | $unicodeNullByteToggle = 0; |
206 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
207 | $c = $s[$i]; |
208 | if ($p == 0) { |
209 | $t = $B64Values[$c]; |
210 | $p = 1; |
211 | } elseif ($p == 1) { |
212 | if ($unicodeNullByteToggle) { |
213 | $d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4)); |
214 | $unicodeNullByteToggle = 0; |
215 | } else { |
216 | $unicodeNullByteToggle = 1; |
217 | } |
218 | $t = ($B64Values[$c] & 15); |
219 | $p = 2; |
220 | } elseif ($p == 2) { |
221 | if ($unicodeNullByteToggle) { |
222 | $d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2)); |
223 | $unicodeNullByteToggle = 0; |
224 | } else { |
225 | $unicodeNullByteToggle = 1; |
226 | } |
227 | $t = ($B64Values[$c] & 3); |
228 | $p = 3; |
229 | } elseif ($p == 3) { |
230 | if ($unicodeNullByteToggle) { |
231 | $d = $d . chr(($t << 6) + $B64Values[$c]); |
232 | $unicodeNullByteToggle = 0; |
233 | } else { |
234 | $unicodeNullByteToggle = 1; |
235 | } |
236 | $t = ($B64Values[$c] & 3); |
237 | $p = 0; |
238 | } |
239 | } |
240 | return $d; |
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241 | } |
242 | |
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243 | ?> |