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