|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/** |
|
4
|
|
|
* A UTF-8 specific character encoder that handles cleaning and transforming. |
|
5
|
|
|
* @note All functions in this class should be static. |
|
6
|
|
|
*/ |
|
7
|
|
|
class HTMLPurifier_Encoder |
|
|
|
|
|
|
8
|
|
|
{ |
|
9
|
|
|
|
|
10
|
|
|
/** |
|
11
|
|
|
* Constructor throws fatal error if you attempt to instantiate class |
|
12
|
|
|
*/ |
|
13
|
|
|
private function __construct() |
|
14
|
|
|
{ |
|
15
|
|
|
trigger_error('Cannot instantiate encoder, call methods statically', E_USER_ERROR); |
|
16
|
|
|
} |
|
17
|
|
|
|
|
18
|
|
|
/** |
|
19
|
|
|
* Error-handler that mutes errors, alternative to shut-up operator. |
|
20
|
|
|
*/ |
|
21
|
|
|
public static function muteErrorHandler() |
|
22
|
|
|
{ |
|
23
|
|
|
} |
|
24
|
|
|
|
|
25
|
|
|
/** |
|
26
|
|
|
* iconv wrapper which mutes errors, but doesn't work around bugs. |
|
27
|
|
|
* @param string $in Input encoding |
|
28
|
|
|
* @param string $out Output encoding |
|
29
|
|
|
* @param string $text The text to convert |
|
30
|
|
|
* @return string |
|
31
|
|
|
*/ |
|
32
|
|
|
public static function unsafeIconv($in, $out, $text) |
|
33
|
|
|
{ |
|
34
|
|
|
set_error_handler(array('HTMLPurifier_Encoder', 'muteErrorHandler')); |
|
35
|
|
|
$r = iconv($in, $out, $text); |
|
36
|
|
|
restore_error_handler(); |
|
37
|
|
|
return $r; |
|
38
|
|
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* iconv wrapper which mutes errors and works around bugs. |
|
42
|
|
|
* @param string $in Input encoding |
|
43
|
|
|
* @param string $out Output encoding |
|
44
|
|
|
* @param string $text The text to convert |
|
45
|
|
|
* @param int $max_chunk_size |
|
46
|
|
|
* @return string |
|
47
|
|
|
*/ |
|
48
|
|
|
public static function iconv($in, $out, $text, $max_chunk_size = 8000) |
|
49
|
|
|
{ |
|
50
|
|
|
$code = self::testIconvTruncateBug(); |
|
51
|
|
|
if ($code == self::ICONV_OK) { |
|
52
|
|
|
return self::unsafeIconv($in, $out, $text); |
|
53
|
|
|
} elseif ($code == self::ICONV_TRUNCATES) { |
|
54
|
|
|
// we can only work around this if the input character set |
|
55
|
|
|
// is utf-8 |
|
56
|
|
|
if ($in == 'utf-8') { |
|
57
|
|
|
if ($max_chunk_size < 4) { |
|
58
|
|
|
trigger_error('max_chunk_size is too small', E_USER_WARNING); |
|
59
|
|
|
return false; |
|
60
|
|
|
} |
|
61
|
|
|
// split into 8000 byte chunks, but be careful to handle |
|
62
|
|
|
// multibyte boundaries properly |
|
63
|
|
|
if (($c = strlen($text)) <= $max_chunk_size) { |
|
64
|
|
|
return self::unsafeIconv($in, $out, $text); |
|
65
|
|
|
} |
|
66
|
|
|
$r = ''; |
|
67
|
|
|
$i = 0; |
|
68
|
|
|
while (true) { |
|
69
|
|
|
if ($i + $max_chunk_size >= $c) { |
|
70
|
|
|
$r .= self::unsafeIconv($in, $out, substr($text, $i)); |
|
71
|
|
|
break; |
|
72
|
|
|
} |
|
73
|
|
|
// wibble the boundary |
|
74
|
|
|
if (0x80 != (0xC0 & ord($text[$i + $max_chunk_size]))) { |
|
75
|
|
|
$chunk_size = $max_chunk_size; |
|
76
|
|
View Code Duplication |
} elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 1]))) { |
|
|
|
|
|
|
77
|
|
|
$chunk_size = $max_chunk_size - 1; |
|
78
|
|
|
} elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 2]))) { |
|
79
|
|
|
$chunk_size = $max_chunk_size - 2; |
|
80
|
|
View Code Duplication |
} elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 3]))) { |
|
|
|
|
|
|
81
|
|
|
$chunk_size = $max_chunk_size - 3; |
|
82
|
|
|
} else { |
|
83
|
|
|
return false; // rather confusing UTF-8... |
|
84
|
|
|
} |
|
85
|
|
|
$chunk = substr($text, $i, $chunk_size); // substr doesn't mind overlong lengths |
|
86
|
|
|
$r .= self::unsafeIconv($in, $out, $chunk); |
|
87
|
|
|
$i += $chunk_size; |
|
88
|
|
|
} |
|
89
|
|
|
return $r; |
|
90
|
|
|
} else { |
|
91
|
|
|
return false; |
|
92
|
|
|
} |
|
93
|
|
|
} else { |
|
94
|
|
|
return false; |
|
95
|
|
|
} |
|
96
|
|
|
} |
|
97
|
|
|
|
|
98
|
|
|
/** |
|
99
|
|
|
* Cleans a UTF-8 string for well-formedness and SGML validity |
|
100
|
|
|
* |
|
101
|
|
|
* It will parse according to UTF-8 and return a valid UTF8 string, with |
|
102
|
|
|
* non-SGML codepoints excluded. |
|
103
|
|
|
* |
|
104
|
|
|
* @param string $str The string to clean |
|
105
|
|
|
* @param bool $force_php |
|
106
|
|
|
* @return string |
|
107
|
|
|
* |
|
108
|
|
|
* @note Just for reference, the non-SGML code points are 0 to 31 and |
|
109
|
|
|
* 127 to 159, inclusive. However, we allow code points 9, 10 |
|
110
|
|
|
* and 13, which are the tab, line feed and carriage return |
|
111
|
|
|
* respectively. 128 and above the code points map to multibyte |
|
112
|
|
|
* UTF-8 representations. |
|
113
|
|
|
* |
|
114
|
|
|
* @note Fallback code adapted from utf8ToUnicode by Henri Sivonen and |
|
115
|
|
|
* [email protected] at <http://iki.fi/hsivonen/php-utf8/> under the |
|
116
|
|
|
* LGPL license. Notes on what changed are inside, but in general, |
|
117
|
|
|
* the original code transformed UTF-8 text into an array of integer |
|
118
|
|
|
* Unicode codepoints. Understandably, transforming that back to |
|
119
|
|
|
* a string would be somewhat expensive, so the function was modded to |
|
120
|
|
|
* directly operate on the string. However, this discourages code |
|
121
|
|
|
* reuse, and the logic enumerated here would be useful for any |
|
122
|
|
|
* function that needs to be able to understand UTF-8 characters. |
|
123
|
|
|
* As of right now, only smart lossless character encoding converters |
|
124
|
|
|
* would need that, and I'm probably not going to implement them. |
|
125
|
|
|
* Once again, PHP 6 should solve all our problems. |
|
126
|
|
|
*/ |
|
127
|
|
|
public static function cleanUTF8($str, $force_php = false) |
|
|
|
|
|
|
128
|
|
|
{ |
|
129
|
|
|
// UTF-8 validity is checked since PHP 4.3.5 |
|
130
|
|
|
// This is an optimization: if the string is already valid UTF-8, no |
|
131
|
|
|
// need to do PHP stuff. 99% of the time, this will be the case. |
|
132
|
|
|
// The regexp matches the XML char production, as well as well as excluding |
|
133
|
|
|
// non-SGML codepoints U+007F to U+009F |
|
134
|
|
|
if (preg_match( |
|
135
|
|
|
'/^[\x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]*$/Du', |
|
136
|
|
|
$str |
|
137
|
|
|
)) { |
|
138
|
|
|
return $str; |
|
139
|
|
|
} |
|
140
|
|
|
|
|
141
|
|
|
$mState = 0; // cached expected number of octets after the current octet |
|
142
|
|
|
// until the beginning of the next UTF8 character sequence |
|
143
|
|
|
$mUcs4 = 0; // cached Unicode character |
|
144
|
|
|
$mBytes = 1; // cached expected number of octets in the current sequence |
|
145
|
|
|
|
|
146
|
|
|
// original code involved an $out that was an array of Unicode |
|
147
|
|
|
// codepoints. Instead of having to convert back into UTF-8, we've |
|
148
|
|
|
// decided to directly append valid UTF-8 characters onto a string |
|
149
|
|
|
// $out once they're done. $char accumulates raw bytes, while $mUcs4 |
|
150
|
|
|
// turns into the Unicode code point, so there's some redundancy. |
|
151
|
|
|
|
|
152
|
|
|
$out = ''; |
|
153
|
|
|
$char = ''; |
|
154
|
|
|
|
|
155
|
|
|
$len = strlen($str); |
|
156
|
|
|
for ($i = 0; $i < $len; $i++) { |
|
157
|
|
|
$in = ord($str{$i}); |
|
158
|
|
|
$char .= $str[$i]; // append byte to char |
|
159
|
|
|
if (0 == $mState) { |
|
160
|
|
|
// When mState is zero we expect either a US-ASCII character |
|
161
|
|
|
// or a multi-octet sequence. |
|
162
|
|
|
if (0 == (0x80 & ($in))) { |
|
163
|
|
|
// US-ASCII, pass straight through. |
|
164
|
|
|
if (($in <= 31 || $in == 127) && |
|
|
|
|
|
|
165
|
|
|
!($in == 9 || $in == 13 || $in == 10) // save \r\t\n |
|
166
|
|
|
) { |
|
167
|
|
|
// control characters, remove |
|
168
|
|
|
} else { |
|
169
|
|
|
$out .= $char; |
|
170
|
|
|
} |
|
171
|
|
|
// reset |
|
172
|
|
|
$char = ''; |
|
173
|
|
|
$mBytes = 1; |
|
174
|
|
View Code Duplication |
} elseif (0xC0 == (0xE0 & ($in))) { |
|
|
|
|
|
|
175
|
|
|
// First octet of 2 octet sequence |
|
176
|
|
|
$mUcs4 = ($in); |
|
177
|
|
|
$mUcs4 = ($mUcs4 & 0x1F) << 6; |
|
178
|
|
|
$mState = 1; |
|
179
|
|
|
$mBytes = 2; |
|
180
|
|
|
} elseif (0xE0 == (0xF0 & ($in))) { |
|
181
|
|
|
// First octet of 3 octet sequence |
|
182
|
|
|
$mUcs4 = ($in); |
|
183
|
|
|
$mUcs4 = ($mUcs4 & 0x0F) << 12; |
|
184
|
|
|
$mState = 2; |
|
185
|
|
|
$mBytes = 3; |
|
186
|
|
View Code Duplication |
} elseif (0xF0 == (0xF8 & ($in))) { |
|
|
|
|
|
|
187
|
|
|
// First octet of 4 octet sequence |
|
188
|
|
|
$mUcs4 = ($in); |
|
189
|
|
|
$mUcs4 = ($mUcs4 & 0x07) << 18; |
|
190
|
|
|
$mState = 3; |
|
191
|
|
|
$mBytes = 4; |
|
192
|
|
|
} elseif (0xF8 == (0xFC & ($in))) { |
|
193
|
|
|
// First octet of 5 octet sequence. |
|
194
|
|
|
// |
|
195
|
|
|
// This is illegal because the encoded codepoint must be |
|
196
|
|
|
// either: |
|
197
|
|
|
// (a) not the shortest form or |
|
198
|
|
|
// (b) outside the Unicode range of 0-0x10FFFF. |
|
199
|
|
|
// Rather than trying to resynchronize, we will carry on |
|
200
|
|
|
// until the end of the sequence and let the later error |
|
201
|
|
|
// handling code catch it. |
|
202
|
|
|
$mUcs4 = ($in); |
|
203
|
|
|
$mUcs4 = ($mUcs4 & 0x03) << 24; |
|
204
|
|
|
$mState = 4; |
|
205
|
|
|
$mBytes = 5; |
|
206
|
|
View Code Duplication |
} elseif (0xFC == (0xFE & ($in))) { |
|
|
|
|
|
|
207
|
|
|
// First octet of 6 octet sequence, see comments for 5 |
|
208
|
|
|
// octet sequence. |
|
209
|
|
|
$mUcs4 = ($in); |
|
210
|
|
|
$mUcs4 = ($mUcs4 & 1) << 30; |
|
211
|
|
|
$mState = 5; |
|
212
|
|
|
$mBytes = 6; |
|
213
|
|
|
} else { |
|
214
|
|
|
// Current octet is neither in the US-ASCII range nor a |
|
215
|
|
|
// legal first octet of a multi-octet sequence. |
|
216
|
|
|
$mState = 0; |
|
217
|
|
|
$mUcs4 = 0; |
|
218
|
|
|
$mBytes = 1; |
|
219
|
|
|
$char = ''; |
|
220
|
|
|
} |
|
221
|
|
|
} else { |
|
222
|
|
|
// When mState is non-zero, we expect a continuation of the |
|
223
|
|
|
// multi-octet sequence |
|
224
|
|
|
if (0x80 == (0xC0 & ($in))) { |
|
225
|
|
|
// Legal continuation. |
|
226
|
|
|
$shift = ($mState - 1) * 6; |
|
227
|
|
|
$tmp = $in; |
|
228
|
|
|
$tmp = ($tmp & 0x0000003F) << $shift; |
|
229
|
|
|
$mUcs4 |= $tmp; |
|
230
|
|
|
|
|
231
|
|
|
if (0 == --$mState) { |
|
232
|
|
|
// End of the multi-octet sequence. mUcs4 now contains |
|
233
|
|
|
// the final Unicode codepoint to be output |
|
234
|
|
|
|
|
235
|
|
|
// Check for illegal sequences and codepoints. |
|
236
|
|
|
|
|
237
|
|
|
// From Unicode 3.1, non-shortest form is illegal |
|
238
|
|
|
if (((2 == $mBytes) && ($mUcs4 < 0x0080)) || |
|
|
|
|
|
|
239
|
|
|
((3 == $mBytes) && ($mUcs4 < 0x0800)) || |
|
240
|
|
|
((4 == $mBytes) && ($mUcs4 < 0x10000)) || |
|
241
|
|
|
(4 < $mBytes) || |
|
242
|
|
|
// From Unicode 3.2, surrogate characters = illegal |
|
243
|
|
|
(($mUcs4 & 0xFFFFF800) == 0xD800) || |
|
244
|
|
|
// Codepoints outside the Unicode range are illegal |
|
245
|
|
|
($mUcs4 > 0x10FFFF) |
|
246
|
|
|
) { |
|
247
|
|
|
|
|
248
|
|
|
} elseif (0xFEFF != $mUcs4 && // omit BOM |
|
249
|
|
|
// check for valid Char unicode codepoints |
|
250
|
|
|
( |
|
251
|
|
|
0x9 == $mUcs4 || |
|
252
|
|
|
0xA == $mUcs4 || |
|
253
|
|
|
0xD == $mUcs4 || |
|
254
|
|
|
(0x20 <= $mUcs4 && 0x7E >= $mUcs4) || |
|
255
|
|
|
// 7F-9F is not strictly prohibited by XML, |
|
256
|
|
|
// but it is non-SGML, and thus we don't allow it |
|
257
|
|
|
(0xA0 <= $mUcs4 && 0xD7FF >= $mUcs4) || |
|
258
|
|
|
(0x10000 <= $mUcs4 && 0x10FFFF >= $mUcs4) |
|
259
|
|
|
) |
|
260
|
|
|
) { |
|
261
|
|
|
$out .= $char; |
|
262
|
|
|
} |
|
263
|
|
|
// initialize UTF8 cache (reset) |
|
264
|
|
|
$mState = 0; |
|
265
|
|
|
$mUcs4 = 0; |
|
266
|
|
|
$mBytes = 1; |
|
267
|
|
|
$char = ''; |
|
268
|
|
|
} |
|
269
|
|
|
} else { |
|
270
|
|
|
// ((0xC0 & (*in) != 0x80) && (mState != 0)) |
|
|
|
|
|
|
271
|
|
|
// Incomplete multi-octet sequence. |
|
272
|
|
|
// used to result in complete fail, but we'll reset |
|
273
|
|
|
$mState = 0; |
|
274
|
|
|
$mUcs4 = 0; |
|
275
|
|
|
$mBytes = 1; |
|
276
|
|
|
$char =''; |
|
277
|
|
|
} |
|
278
|
|
|
} |
|
279
|
|
|
} |
|
280
|
|
|
return $out; |
|
281
|
|
|
} |
|
282
|
|
|
|
|
283
|
|
|
/** |
|
284
|
|
|
* Translates a Unicode codepoint into its corresponding UTF-8 character. |
|
285
|
|
|
* @note Based on Feyd's function at |
|
286
|
|
|
* <http://forums.devnetwork.net/viewtopic.php?p=191404#191404>, |
|
287
|
|
|
* which is in public domain. |
|
288
|
|
|
* @note While we're going to do code point parsing anyway, a good |
|
289
|
|
|
* optimization would be to refuse to translate code points that |
|
290
|
|
|
* are non-SGML characters. However, this could lead to duplication. |
|
291
|
|
|
* @note This is very similar to the unichr function in |
|
292
|
|
|
* maintenance/generate-entity-file.php (although this is superior, |
|
293
|
|
|
* due to its sanity checks). |
|
294
|
|
|
*/ |
|
295
|
|
|
|
|
296
|
|
|
// +----------+----------+----------+----------+ |
|
297
|
|
|
// | 33222222 | 22221111 | 111111 | | |
|
|
|
|
|
|
298
|
|
|
// | 10987654 | 32109876 | 54321098 | 76543210 | bit |
|
|
|
|
|
|
299
|
|
|
// +----------+----------+----------+----------+ |
|
300
|
|
|
// | | | | 0xxxxxxx | 1 byte 0x00000000..0x0000007F |
|
|
|
|
|
|
301
|
|
|
// | | | 110yyyyy | 10xxxxxx | 2 byte 0x00000080..0x000007FF |
|
|
|
|
|
|
302
|
|
|
// | | 1110zzzz | 10yyyyyy | 10xxxxxx | 3 byte 0x00000800..0x0000FFFF |
|
|
|
|
|
|
303
|
|
|
// | 11110www | 10wwzzzz | 10yyyyyy | 10xxxxxx | 4 byte 0x00010000..0x0010FFFF |
|
|
|
|
|
|
304
|
|
|
// +----------+----------+----------+----------+ |
|
305
|
|
|
// | 00000000 | 00011111 | 11111111 | 11111111 | Theoretical upper limit of legal scalars: 2097151 (0x001FFFFF) |
|
|
|
|
|
|
306
|
|
|
// | 00000000 | 00010000 | 11111111 | 11111111 | Defined upper limit of legal scalar codes |
|
307
|
|
|
// +----------+----------+----------+----------+ |
|
308
|
|
|
|
|
309
|
|
|
public static function unichr($code) |
|
310
|
|
|
{ |
|
311
|
|
|
if ($code > 1114111 or $code < 0 or |
|
|
|
|
|
|
312
|
|
|
($code >= 55296 and $code <= 57343) ) { |
|
|
|
|
|
|
313
|
|
|
// bits are set outside the "valid" range as defined |
|
314
|
|
|
// by UNICODE 4.1.0 |
|
315
|
|
|
return ''; |
|
316
|
|
|
} |
|
317
|
|
|
|
|
318
|
|
|
$x = $y = $z = $w = 0; |
|
|
|
|
|
|
319
|
|
|
if ($code < 128) { |
|
320
|
|
|
// regular ASCII character |
|
321
|
|
|
$x = $code; |
|
322
|
|
|
} else { |
|
323
|
|
|
// set up bits for UTF-8 |
|
324
|
|
|
$x = ($code & 63) | 128; |
|
325
|
|
|
if ($code < 2048) { |
|
326
|
|
|
$y = (($code & 2047) >> 6) | 192; |
|
327
|
|
|
} else { |
|
328
|
|
|
$y = (($code & 4032) >> 6) | 128; |
|
329
|
|
|
if ($code < 65536) { |
|
330
|
|
|
$z = (($code >> 12) & 15) | 224; |
|
331
|
|
|
} else { |
|
332
|
|
|
$z = (($code >> 12) & 63) | 128; |
|
333
|
|
|
$w = (($code >> 18) & 7) | 240; |
|
334
|
|
|
} |
|
335
|
|
|
} |
|
336
|
|
|
} |
|
337
|
|
|
// set up the actual character |
|
338
|
|
|
$ret = ''; |
|
339
|
|
|
if ($w) { |
|
340
|
|
|
$ret .= chr($w); |
|
341
|
|
|
} |
|
342
|
|
|
if ($z) { |
|
343
|
|
|
$ret .= chr($z); |
|
344
|
|
|
} |
|
345
|
|
|
if ($y) { |
|
346
|
|
|
$ret .= chr($y); |
|
347
|
|
|
} |
|
348
|
|
|
$ret .= chr($x); |
|
349
|
|
|
|
|
350
|
|
|
return $ret; |
|
351
|
|
|
} |
|
352
|
|
|
|
|
353
|
|
|
/** |
|
354
|
|
|
* @return bool |
|
355
|
|
|
*/ |
|
356
|
|
|
public static function iconvAvailable() |
|
357
|
|
|
{ |
|
358
|
|
|
static $iconv = null; |
|
359
|
|
|
if ($iconv === null) { |
|
360
|
|
|
$iconv = function_exists('iconv') && self::testIconvTruncateBug() != self::ICONV_UNUSABLE; |
|
361
|
|
|
} |
|
362
|
|
|
return $iconv; |
|
363
|
|
|
} |
|
364
|
|
|
|
|
365
|
|
|
/** |
|
366
|
|
|
* Convert a string to UTF-8 based on configuration. |
|
367
|
|
|
* @param string $str The string to convert |
|
368
|
|
|
* @param HTMLPurifier_Config $config |
|
369
|
|
|
* @param HTMLPurifier_Context $context |
|
370
|
|
|
* @return string |
|
371
|
|
|
*/ |
|
372
|
|
|
public static function convertToUTF8($str, $config, $context) |
|
|
|
|
|
|
373
|
|
|
{ |
|
374
|
|
|
$encoding = $config->get('Core.Encoding'); |
|
375
|
|
|
if ($encoding === 'utf-8') { |
|
376
|
|
|
return $str; |
|
377
|
|
|
} |
|
378
|
|
|
static $iconv = null; |
|
379
|
|
|
if ($iconv === null) { |
|
380
|
|
|
$iconv = self::iconvAvailable(); |
|
381
|
|
|
} |
|
382
|
|
|
if ($iconv && !$config->get('Test.ForceNoIconv')) { |
|
383
|
|
|
// unaffected by bugs, since UTF-8 support all characters |
|
384
|
|
|
$str = self::unsafeIconv($encoding, 'utf-8//IGNORE', $str); |
|
385
|
|
|
if ($str === false) { |
|
386
|
|
|
// $encoding is not a valid encoding |
|
387
|
|
|
trigger_error('Invalid encoding ' . $encoding, E_USER_ERROR); |
|
388
|
|
|
return ''; |
|
389
|
|
|
} |
|
390
|
|
|
// If the string is bjorked by Shift_JIS or a similar encoding |
|
391
|
|
|
// that doesn't support all of ASCII, convert the naughty |
|
392
|
|
|
// characters to their true byte-wise ASCII/UTF-8 equivalents. |
|
393
|
|
|
$str = strtr($str, self::testEncodingSupportsASCII($encoding)); |
|
394
|
|
|
return $str; |
|
395
|
|
|
} elseif ($encoding === 'iso-8859-1') { |
|
396
|
|
|
$str = utf8_encode($str); |
|
397
|
|
|
return $str; |
|
398
|
|
|
} |
|
399
|
|
|
$bug = HTMLPurifier_Encoder::testIconvTruncateBug(); |
|
400
|
|
|
if ($bug == self::ICONV_OK) { |
|
401
|
|
|
trigger_error('Encoding not supported, please install iconv', E_USER_ERROR); |
|
402
|
|
|
} else { |
|
403
|
|
|
trigger_error( |
|
404
|
|
|
'You have a buggy version of iconv, see https://bugs.php.net/bug.php?id=48147 ' . |
|
405
|
|
|
'and http://sourceware.org/bugzilla/show_bug.cgi?id=13541', |
|
406
|
|
|
E_USER_ERROR |
|
407
|
|
|
); |
|
408
|
|
|
} |
|
409
|
|
|
} |
|
410
|
|
|
|
|
411
|
|
|
/** |
|
412
|
|
|
* Converts a string from UTF-8 based on configuration. |
|
413
|
|
|
* @param string $str The string to convert |
|
414
|
|
|
* @param HTMLPurifier_Config $config |
|
415
|
|
|
* @param HTMLPurifier_Context $context |
|
416
|
|
|
* @return string |
|
417
|
|
|
* @note Currently, this is a lossy conversion, with unexpressable |
|
418
|
|
|
* characters being omitted. |
|
419
|
|
|
*/ |
|
420
|
|
|
public static function convertFromUTF8($str, $config, $context) |
|
|
|
|
|
|
421
|
|
|
{ |
|
422
|
|
|
$encoding = $config->get('Core.Encoding'); |
|
423
|
|
|
if ($escape = $config->get('Core.EscapeNonASCIICharacters')) { |
|
424
|
|
|
$str = self::convertToASCIIDumbLossless($str); |
|
425
|
|
|
} |
|
426
|
|
|
if ($encoding === 'utf-8') { |
|
427
|
|
|
return $str; |
|
428
|
|
|
} |
|
429
|
|
|
static $iconv = null; |
|
430
|
|
|
if ($iconv === null) { |
|
431
|
|
|
$iconv = self::iconvAvailable(); |
|
432
|
|
|
} |
|
433
|
|
|
if ($iconv && !$config->get('Test.ForceNoIconv')) { |
|
434
|
|
|
// Undo our previous fix in convertToUTF8, otherwise iconv will barf |
|
435
|
|
|
$ascii_fix = self::testEncodingSupportsASCII($encoding); |
|
436
|
|
|
if (!$escape && !empty($ascii_fix)) { |
|
437
|
|
|
$clear_fix = array(); |
|
438
|
|
|
foreach ($ascii_fix as $utf8 => $native) { |
|
439
|
|
|
$clear_fix[$utf8] = ''; |
|
440
|
|
|
} |
|
441
|
|
|
$str = strtr($str, $clear_fix); |
|
442
|
|
|
} |
|
443
|
|
|
$str = strtr($str, array_flip($ascii_fix)); |
|
444
|
|
|
// Normal stuff |
|
445
|
|
|
$str = self::iconv('utf-8', $encoding . '//IGNORE', $str); |
|
446
|
|
|
return $str; |
|
447
|
|
|
} elseif ($encoding === 'iso-8859-1') { |
|
448
|
|
|
$str = utf8_decode($str); |
|
449
|
|
|
return $str; |
|
450
|
|
|
} |
|
451
|
|
|
trigger_error('Encoding not supported', E_USER_ERROR); |
|
452
|
|
|
// You might be tempted to assume that the ASCII representation |
|
453
|
|
|
// might be OK, however, this is *not* universally true over all |
|
454
|
|
|
// encodings. So we take the conservative route here, rather |
|
455
|
|
|
// than forcibly turn on %Core.EscapeNonASCIICharacters |
|
456
|
|
|
} |
|
457
|
|
|
|
|
458
|
|
|
/** |
|
459
|
|
|
* Lossless (character-wise) conversion of HTML to ASCII |
|
460
|
|
|
* @param string $str UTF-8 string to be converted to ASCII |
|
461
|
|
|
* @return string ASCII encoded string with non-ASCII character entity-ized |
|
462
|
|
|
* @warning Adapted from MediaWiki, claiming fair use: this is a common |
|
463
|
|
|
* algorithm. If you disagree with this license fudgery, |
|
464
|
|
|
* implement it yourself. |
|
465
|
|
|
* @note Uses decimal numeric entities since they are best supported. |
|
466
|
|
|
* @note This is a DUMB function: it has no concept of keeping |
|
467
|
|
|
* character entities that the projected character encoding |
|
468
|
|
|
* can allow. We could possibly implement a smart version |
|
469
|
|
|
* but that would require it to also know which Unicode |
|
470
|
|
|
* codepoints the charset supported (not an easy task). |
|
471
|
|
|
* @note Sort of with cleanUTF8() but it assumes that $str is |
|
472
|
|
|
* well-formed UTF-8 |
|
473
|
|
|
*/ |
|
474
|
|
|
public static function convertToASCIIDumbLossless($str) |
|
475
|
|
|
{ |
|
476
|
|
|
$bytesleft = 0; |
|
477
|
|
|
$result = ''; |
|
478
|
|
|
$working = 0; |
|
479
|
|
|
$len = strlen($str); |
|
480
|
|
|
for ($i = 0; $i < $len; $i++) { |
|
481
|
|
|
$bytevalue = ord($str[$i]); |
|
482
|
|
|
if ($bytevalue <= 0x7F) { //0xxx xxxx |
|
483
|
|
|
$result .= chr($bytevalue); |
|
484
|
|
|
$bytesleft = 0; |
|
485
|
|
|
} elseif ($bytevalue <= 0xBF) { //10xx xxxx |
|
486
|
|
|
$working = $working << 6; |
|
487
|
|
|
$working += ($bytevalue & 0x3F); |
|
488
|
|
|
$bytesleft--; |
|
489
|
|
|
if ($bytesleft <= 0) { |
|
490
|
|
|
$result .= "&#" . $working . ";"; |
|
491
|
|
|
} |
|
492
|
|
|
} elseif ($bytevalue <= 0xDF) { //110x xxxx |
|
493
|
|
|
$working = $bytevalue & 0x1F; |
|
494
|
|
|
$bytesleft = 1; |
|
495
|
|
|
} elseif ($bytevalue <= 0xEF) { //1110 xxxx |
|
496
|
|
|
$working = $bytevalue & 0x0F; |
|
497
|
|
|
$bytesleft = 2; |
|
498
|
|
|
} else { //1111 0xxx |
|
499
|
|
|
$working = $bytevalue & 0x07; |
|
500
|
|
|
$bytesleft = 3; |
|
501
|
|
|
} |
|
502
|
|
|
} |
|
503
|
|
|
return $result; |
|
504
|
|
|
} |
|
505
|
|
|
|
|
506
|
|
|
/** No bugs detected in iconv. */ |
|
507
|
|
|
const ICONV_OK = 0; |
|
508
|
|
|
|
|
509
|
|
|
/** Iconv truncates output if converting from UTF-8 to another |
|
510
|
|
|
* character set with //IGNORE, and a non-encodable character is found */ |
|
511
|
|
|
const ICONV_TRUNCATES = 1; |
|
512
|
|
|
|
|
513
|
|
|
/** Iconv does not support //IGNORE, making it unusable for |
|
514
|
|
|
* transcoding purposes */ |
|
515
|
|
|
const ICONV_UNUSABLE = 2; |
|
516
|
|
|
|
|
517
|
|
|
/** |
|
518
|
|
|
* glibc iconv has a known bug where it doesn't handle the magic |
|
519
|
|
|
* //IGNORE stanza correctly. In particular, rather than ignore |
|
520
|
|
|
* characters, it will return an EILSEQ after consuming some number |
|
521
|
|
|
* of characters, and expect you to restart iconv as if it were |
|
522
|
|
|
* an E2BIG. Old versions of PHP did not respect the errno, and |
|
523
|
|
|
* returned the fragment, so as a result you would see iconv |
|
524
|
|
|
* mysteriously truncating output. We can work around this by |
|
525
|
|
|
* manually chopping our input into segments of about 8000 |
|
526
|
|
|
* characters, as long as PHP ignores the error code. If PHP starts |
|
527
|
|
|
* paying attention to the error code, iconv becomes unusable. |
|
528
|
|
|
* |
|
529
|
|
|
* @return int Error code indicating severity of bug. |
|
530
|
|
|
*/ |
|
531
|
|
|
public static function testIconvTruncateBug() |
|
532
|
|
|
{ |
|
533
|
|
|
static $code = null; |
|
534
|
|
|
if ($code === null) { |
|
535
|
|
|
// better not use iconv, otherwise infinite loop! |
|
536
|
|
|
$r = self::unsafeIconv('utf-8', 'ascii//IGNORE', "\xCE\xB1" . str_repeat('a', 9000)); |
|
537
|
|
|
if ($r === false) { |
|
538
|
|
|
$code = self::ICONV_UNUSABLE; |
|
539
|
|
|
} elseif (($c = strlen($r)) < 9000) { |
|
540
|
|
|
$code = self::ICONV_TRUNCATES; |
|
541
|
|
|
} elseif ($c > 9000) { |
|
542
|
|
|
trigger_error( |
|
543
|
|
|
'Your copy of iconv is extremely buggy. Please notify HTML Purifier maintainers: ' . |
|
544
|
|
|
'include your iconv version as per phpversion()', |
|
545
|
|
|
E_USER_ERROR |
|
546
|
|
|
); |
|
547
|
|
|
} else { |
|
548
|
|
|
$code = self::ICONV_OK; |
|
549
|
|
|
} |
|
550
|
|
|
} |
|
551
|
|
|
return $code; |
|
552
|
|
|
} |
|
553
|
|
|
|
|
554
|
|
|
/** |
|
555
|
|
|
* This expensive function tests whether or not a given character |
|
556
|
|
|
* encoding supports ASCII. 7/8-bit encodings like Shift_JIS will |
|
557
|
|
|
* fail this test, and require special processing. Variable width |
|
558
|
|
|
* encodings shouldn't ever fail. |
|
559
|
|
|
* |
|
560
|
|
|
* @param string $encoding Encoding name to test, as per iconv format |
|
561
|
|
|
* @param bool $bypass Whether or not to bypass the precompiled arrays. |
|
562
|
|
|
* @return Array of UTF-8 characters to their corresponding ASCII, |
|
563
|
|
|
* which can be used to "undo" any overzealous iconv action. |
|
564
|
|
|
*/ |
|
565
|
|
|
public static function testEncodingSupportsASCII($encoding, $bypass = false) |
|
566
|
|
|
{ |
|
567
|
|
|
// All calls to iconv here are unsafe, proof by case analysis: |
|
568
|
|
|
// If ICONV_OK, no difference. |
|
569
|
|
|
// If ICONV_TRUNCATE, all calls involve one character inputs, |
|
570
|
|
|
// so bug is not triggered. |
|
571
|
|
|
// If ICONV_UNUSABLE, this call is irrelevant |
|
572
|
|
|
static $encodings = array(); |
|
573
|
|
|
if (!$bypass) { |
|
574
|
|
|
if (isset($encodings[$encoding])) { |
|
575
|
|
|
return $encodings[$encoding]; |
|
576
|
|
|
} |
|
577
|
|
|
$lenc = strtolower($encoding); |
|
578
|
|
|
switch ($lenc) { |
|
579
|
|
|
case 'shift_jis': |
|
580
|
|
|
return array("\xC2\xA5" => '\\', "\xE2\x80\xBE" => '~'); |
|
581
|
|
|
case 'johab': |
|
582
|
|
|
return array("\xE2\x82\xA9" => '\\'); |
|
583
|
|
|
} |
|
584
|
|
|
if (strpos($lenc, 'iso-8859-') === 0) { |
|
585
|
|
|
return array(); |
|
586
|
|
|
} |
|
587
|
|
|
} |
|
588
|
|
|
$ret = array(); |
|
589
|
|
|
if (self::unsafeIconv('UTF-8', $encoding, 'a') === false) { |
|
590
|
|
|
return false; |
|
|
|
|
|
|
591
|
|
|
} |
|
592
|
|
|
for ($i = 0x20; $i <= 0x7E; $i++) { // all printable ASCII chars |
|
593
|
|
|
$c = chr($i); // UTF-8 char |
|
594
|
|
|
$r = self::unsafeIconv('UTF-8', "$encoding//IGNORE", $c); // initial conversion |
|
595
|
|
|
if ($r === '' || |
|
596
|
|
|
// This line is needed for iconv implementations that do not |
|
597
|
|
|
// omit characters that do not exist in the target character set |
|
598
|
|
|
($r === $c && self::unsafeIconv($encoding, 'UTF-8//IGNORE', $r) !== $c) |
|
599
|
|
|
) { |
|
600
|
|
|
// Reverse engineer: what's the UTF-8 equiv of this byte |
|
601
|
|
|
// sequence? This assumes that there's no variable width |
|
602
|
|
|
// encoding that doesn't support ASCII. |
|
603
|
|
|
$ret[self::unsafeIconv($encoding, 'UTF-8//IGNORE', $c)] = $c; |
|
604
|
|
|
} |
|
605
|
|
|
} |
|
606
|
|
|
$encodings[$encoding] = $ret; |
|
607
|
|
|
return $ret; |
|
608
|
|
|
} |
|
609
|
|
|
} |
|
610
|
|
|
|
|
611
|
|
|
// vim: et sw=4 sts=4 |
|
612
|
|
|
|
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.