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1 | <?php |
2 | |
3 | /** |
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4 | * imap_utf7_local.php |
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5 | * |
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6 | * Copyright (c) 1999-2004 The SquirrelMail Project Team |
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7 | * Licensed under the GNU GPL. For full terms see the file COPYING. |
8 | * |
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9 | * This implements all functions that do imap UTF7 conversions. |
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10 | * |
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11 | * @version $Id$ |
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12 | * @package squirrelmail |
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13 | * @subpackage imap |
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14 | */ |
15 | |
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16 | /** |
17 | * @param string $str |
18 | * @param string $to_encoding |
19 | * @param string $from_encoding |
20 | * @param string $default_charset |
21 | * @return string |
22 | */ |
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23 | function sqimap_mb_convert_encoding($str, $to_encoding, $from_encoding, $default_charset) |
24 | { |
25 | // Allows mbstring functions only with iso-8859-*, utf-8 and |
26 | // iso-2022-jp (Japanese) |
27 | // koi8-r and gb2312 can be added only in php 4.3+ |
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28 | if ( stristr($default_charset, 'iso-8859-') || |
29 | stristr($default_charset, 'utf-8') || |
30 | stristr($default_charset, 'iso-2022-jp') ) { |
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31 | if (function_exists('mb_convert_encoding')) { |
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32 | return mb_convert_encoding($str, $to_encoding, $from_encoding); |
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33 | } |
34 | } |
35 | return ''; |
36 | } |
37 | |
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38 | function imap_utf7_encode_local($s) { |
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39 | global $languages, $squirrelmail_language; |
40 | |
41 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
42 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) { |
43 | return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_encode', $s); |
44 | } |
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45 | |
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46 | if ($s == '') //If empty, don't bother |
47 | return ''; |
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48 | |
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49 | global $default_charset; |
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50 | set_my_charset(); //must be called before using $default_charset |
51 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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52 | $utf7_s = sqimap_mb_convert_encoding($s, 'UTF7-IMAP', $default_charset, $default_charset); |
53 | if ($utf7_s != '') |
54 | return $utf7_s; |
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55 | } |
56 | |
57 | // Later code works only for ISO-8859-1 |
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58 | |
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59 | $b64_s = ''; // buffer for substring to be base64-encoded |
60 | $utf7_s = ''; // imap-utf7-encoded string |
61 | for ($i = 0; $i < strlen($s); $i++) { |
62 | $c = $s[$i]; |
63 | $ord_c = ord($c); |
64 | if ((($ord_c >= 0x20) and ($ord_c <= 0x25)) or |
65 | (($ord_c >= 0x27) and ($ord_c <= 0x7e))) { |
66 | if ($b64_s) { |
67 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) .'-'; |
68 | $b64_s = ''; |
69 | } |
70 | $utf7_s = $utf7_s . $c; |
71 | } elseif ($ord_c == 0x26) { |
72 | if ($b64_s) { |
73 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
74 | $b64_s = ''; |
75 | } |
76 | $utf7_s = $utf7_s . '&-'; |
77 | } else { |
78 | $b64_s = $b64_s . chr(0) . $c; |
79 | } |
80 | } |
81 | // |
82 | // flush buffer |
83 | // |
84 | if ($b64_s) { |
85 | $utf7_s = $utf7_s . '&' . encodeBASE64($b64_s) . '-'; |
86 | $b64_s = ''; |
87 | } |
88 | return $utf7_s; |
89 | } |
90 | |
91 | function imap_utf7_decode_local($s) { |
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92 | global $languages, $squirrelmail_language; |
93 | |
94 | if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && |
95 | function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) { |
96 | return $languages[$squirrelmail_language]['XTRA_CODE']('utf7-imap_decode', $s); |
97 | } |
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98 | |
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99 | if ($s == '') //If empty, don't bother |
100 | return ''; |
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101 | |
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102 | global $default_charset; |
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103 | set_my_charset(); //must be called before using $default_charset |
104 | if ((strtolower($default_charset) != 'iso-8859-1') && ($default_charset != '')) { |
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105 | $utf7_s = sqimap_mb_convert_encoding($s, $default_charset, 'UTF7-IMAP', $default_charset); |
106 | if ($utf7_s != '') |
107 | return $utf7_s; |
108 | } |
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109 | |
110 | // Later code works only for ISO-8859-1 |
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111 | |
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112 | $b64_s = ''; |
113 | $iso_8859_1_s = ''; |
114 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
115 | $c = $s[$i]; |
116 | if (strlen($b64_s) > 0) { |
117 | if ($c == '-') { |
118 | if ($b64_s == '&') { |
119 | $iso_8859_1_s = $iso_8859_1_s . '&'; |
120 | } else { |
121 | $iso_8859_1_s = $iso_8859_1_s . |
122 | decodeBASE64(substr($b64_s, 1)); |
123 | } |
124 | $b64_s = ''; |
125 | } else { |
126 | $b64_s = $b64_s . $c; |
127 | } |
128 | } else { |
129 | if ($c == '&') { |
130 | $b64_s = '&'; |
131 | } else { |
132 | $iso_8859_1_s = $iso_8859_1_s . $c; |
133 | } |
134 | } |
135 | } |
136 | return $iso_8859_1_s; |
137 | } |
138 | |
139 | function encodeBASE64($s) { |
140 | $B64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,'; |
141 | $p = 0; // phase: 1 / 2 / 3 / 1 / 2 / 3... |
142 | $e = ''; // base64-encoded string |
143 | //foreach($s as $c) { |
144 | for ($i = 0; $i < strlen($s); $i++) { |
145 | $c = $s[$i]; |
146 | if ($p == 0) { |
147 | $e = $e . substr($B64Chars, ((ord($c) & 252) >> 2), 1); |
148 | $t = (ord($c) & 3); |
149 | $p = 1; |
150 | } elseif ($p == 1) { |
151 | $e = $e . $B64Chars[($t << 4) + ((ord($c) & 240) >> 4)]; |
152 | $t = (ord($c) & 15); |
153 | $p = 2; |
154 | } elseif ($p == 2) { |
155 | $e = $e . $B64Chars[($t << 2) + ((ord($c) & 192) >> 6)]; |
156 | $e = $e . $B64Chars[ord($c) & 63]; |
157 | $p = 0; |
158 | } |
159 | } |
160 | // |
161 | // flush buffer |
162 | // |
163 | if ($p == 1) { |
164 | $e = $e . $B64Chars[$t << 4]; |
165 | } elseif ($p == 2) { |
166 | $e = $e . $B64Chars[$t << 2]; |
167 | } |
168 | return $e; |
169 | } |
170 | |
171 | function decodeBASE64($s) { |
172 | $B64Values = array( |
173 | 'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5, |
174 | 'G' => 6, 'H' => 7, 'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11, |
175 | 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15, 'Q' => 16, 'R' => 17, |
176 | 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23, |
177 | 'Y' => 24, 'Z' => 25, |
178 | 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31, |
179 | 'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37, |
180 | 'm' => 38, 'n' => 39, 'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43, |
181 | 's' => 44, 't' => 45, 'u' => 46, 'v' => 47, 'w' => 48, 'x' => 49, |
182 | 'y' => 50, 'z' => 51, |
183 | '0' => 52, '1' => 53, '2' => 54, '3' => 55, '4' => 56, '5' => 57, |
184 | '6' => 58, '7' => 59, '8' => 60, '9' => 61, '+' => 62, ',' => 63 |
185 | ); |
186 | $p = 0; |
187 | $d = ''; |
188 | $unicodeNullByteToggle = 0; |
189 | for ($i = 0, $len = strlen($s); $i < $len; $i++) { |
190 | $c = $s[$i]; |
191 | if ($p == 0) { |
192 | $t = $B64Values[$c]; |
193 | $p = 1; |
194 | } elseif ($p == 1) { |
195 | if ($unicodeNullByteToggle) { |
196 | $d = $d . chr(($t << 2) + (($B64Values[$c] & 48) >> 4)); |
197 | $unicodeNullByteToggle = 0; |
198 | } else { |
199 | $unicodeNullByteToggle = 1; |
200 | } |
201 | $t = ($B64Values[$c] & 15); |
202 | $p = 2; |
203 | } elseif ($p == 2) { |
204 | if ($unicodeNullByteToggle) { |
205 | $d = $d . chr(($t << 4) + (($B64Values[$c] & 60) >> 2)); |
206 | $unicodeNullByteToggle = 0; |
207 | } else { |
208 | $unicodeNullByteToggle = 1; |
209 | } |
210 | $t = ($B64Values[$c] & 3); |
211 | $p = 3; |
212 | } elseif ($p == 3) { |
213 | if ($unicodeNullByteToggle) { |
214 | $d = $d . chr(($t << 6) + $B64Values[$c]); |
215 | $unicodeNullByteToggle = 0; |
216 | } else { |
217 | $unicodeNullByteToggle = 1; |
218 | } |
219 | $t = ($B64Values[$c] & 3); |
220 | $p = 0; |
221 | } |
222 | } |
223 | return $d; |
224 | } |
225 | |
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226 | ?> |