1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
|
/*
* Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2007-2009 Torch Mobile, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TextEncodingRegistry.h"
#include "TextCodecLatin1.h"
#include "TextCodecUserDefined.h"
#include "TextCodecUTF16.h"
#include "TextCodecUTF8.h"
#include "TextEncoding.h"
#include <wtf/ASCIICType.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/StdLibExtras.h>
#include <wtf/StringExtras.h>
#include <wtf/Threading.h>
#if USE(ICU_UNICODE)
#include "TextCodecICU.h"
#endif
#if PLATFORM(MAC)
#include "TextCodecMac.h"
#endif
#if PLATFORM(QT)
#include "qt/TextCodecQt.h"
#endif
#if USE(GLIB_UNICODE)
#include "gtk/TextCodecGtk.h"
#endif
#if USE(BREWMP_UNICODE)
#include "brew/TextCodecBrew.h"
#endif
#if OS(WINCE) && !PLATFORM(QT)
#include "TextCodecWinCE.h"
#endif
using namespace WTF;
namespace WebCore {
const size_t maxEncodingNameLength = 63;
// Hash for all-ASCII strings that does case folding.
struct TextEncodingNameHash {
static bool equal(const char* s1, const char* s2)
{
char c1;
char c2;
do {
c1 = *s1++;
c2 = *s2++;
if (toASCIILower(c1) != toASCIILower(c2))
return false;
} while (c1 && c2);
return !c1 && !c2;
}
// This algorithm is the one-at-a-time hash from:
// http://burtleburtle.net/bob/hash/hashfaq.html
// http://burtleburtle.net/bob/hash/doobs.html
static unsigned hash(const char* s)
{
unsigned h = WTF::stringHashingStartValue;
for (;;) {
char c = *s++;
if (!c) {
h += (h << 3);
h ^= (h >> 11);
h += (h << 15);
return h;
}
h += toASCIILower(c);
h += (h << 10);
h ^= (h >> 6);
}
}
static const bool safeToCompareToEmptyOrDeleted = false;
};
struct TextCodecFactory {
NewTextCodecFunction function;
const void* additionalData;
TextCodecFactory(NewTextCodecFunction f = 0, const void* d = 0) : function(f), additionalData(d) { }
};
typedef HashMap<const char*, const char*, TextEncodingNameHash> TextEncodingNameMap;
typedef HashMap<const char*, TextCodecFactory> TextCodecMap;
static Mutex& encodingRegistryMutex()
{
// We don't have to use AtomicallyInitializedStatic here because
// this function is called on the main thread for any page before
// it is used in worker threads.
DEFINE_STATIC_LOCAL(Mutex, mutex, ());
return mutex;
}
static TextEncodingNameMap* textEncodingNameMap;
static TextCodecMap* textCodecMap;
static bool didExtendTextCodecMaps;
static HashSet<const char*>* japaneseEncodings;
static HashSet<const char*>* nonBackslashEncodings;
static const char* const textEncodingNameBlacklist[] = { "UTF-7" };
#if ERROR_DISABLED
static inline void checkExistingName(const char*, const char*) { }
#else
static void checkExistingName(const char* alias, const char* atomicName)
{
const char* oldAtomicName = textEncodingNameMap->get(alias);
if (!oldAtomicName)
return;
if (oldAtomicName == atomicName)
return;
// Keep the warning silent about one case where we know this will happen.
if (strcmp(alias, "ISO-8859-8-I") == 0
&& strcmp(oldAtomicName, "ISO-8859-8-I") == 0
&& strcasecmp(atomicName, "iso-8859-8") == 0)
return;
LOG_ERROR("alias %s maps to %s already, but someone is trying to make it map to %s", alias, oldAtomicName, atomicName);
}
#endif
static bool isUndesiredAlias(const char* alias)
{
// Reject aliases with version numbers that are supported by some back-ends (such as "ISO_2022,locale=ja,version=0" in ICU).
for (const char* p = alias; *p; ++p) {
if (*p == ',')
return true;
}
// 8859_1 is known to (at least) ICU, but other browsers don't support this name - and having it caused a compatibility
// problem, see bug 43554.
if (0 == strcmp(alias, "8859_1"))
return true;
return false;
}
static void addToTextEncodingNameMap(const char* alias, const char* name)
{
ASSERT(strlen(alias) <= maxEncodingNameLength);
if (isUndesiredAlias(alias))
return;
const char* atomicName = textEncodingNameMap->get(name);
ASSERT(strcmp(alias, name) == 0 || atomicName);
if (!atomicName)
atomicName = name;
checkExistingName(alias, atomicName);
textEncodingNameMap->add(alias, atomicName);
}
static void addToTextCodecMap(const char* name, NewTextCodecFunction function, const void* additionalData)
{
const char* atomicName = textEncodingNameMap->get(name);
ASSERT(atomicName);
textCodecMap->add(atomicName, TextCodecFactory(function, additionalData));
}
static void pruneBlacklistedCodecs()
{
for (size_t i = 0; i < WTF_ARRAY_LENGTH(textEncodingNameBlacklist); ++i) {
const char* atomicName = textEncodingNameMap->get(textEncodingNameBlacklist[i]);
if (!atomicName)
continue;
Vector<const char*> names;
TextEncodingNameMap::const_iterator it = textEncodingNameMap->begin();
TextEncodingNameMap::const_iterator end = textEncodingNameMap->end();
for (; it != end; ++it) {
if (it->second == atomicName)
names.append(it->first);
}
size_t length = names.size();
for (size_t j = 0; j < length; ++j)
textEncodingNameMap->remove(names[j]);
textCodecMap->remove(atomicName);
}
}
static void buildBaseTextCodecMaps()
{
ASSERT(isMainThread());
ASSERT(!textCodecMap);
ASSERT(!textEncodingNameMap);
textCodecMap = new TextCodecMap;
textEncodingNameMap = new TextEncodingNameMap;
TextCodecLatin1::registerEncodingNames(addToTextEncodingNameMap);
TextCodecLatin1::registerCodecs(addToTextCodecMap);
TextCodecUTF16::registerEncodingNames(addToTextEncodingNameMap);
TextCodecUTF16::registerCodecs(addToTextCodecMap);
TextCodecUserDefined::registerEncodingNames(addToTextEncodingNameMap);
TextCodecUserDefined::registerCodecs(addToTextCodecMap);
#if USE(ICU_UNICODE)
TextCodecICU::registerBaseEncodingNames(addToTextEncodingNameMap);
TextCodecICU::registerBaseCodecs(addToTextCodecMap);
#endif
#if USE(GLIB_UNICODE)
TextCodecGtk::registerBaseEncodingNames(addToTextEncodingNameMap);
TextCodecGtk::registerBaseCodecs(addToTextCodecMap);
#endif
#if USE(BREWMP_UNICODE)
TextCodecBrew::registerBaseEncodingNames(addToTextEncodingNameMap);
TextCodecBrew::registerBaseCodecs(addToTextCodecMap);
#endif
#if OS(WINCE) && !PLATFORM(QT)
TextCodecWinCE::registerBaseEncodingNames(addToTextEncodingNameMap);
TextCodecWinCE::registerBaseCodecs(addToTextCodecMap);
#endif
}
static void addEncodingName(HashSet<const char*>* set, const char* name)
{
// We must not use atomicCanonicalTextEncodingName() because this function is called in it.
const char* atomicName = textEncodingNameMap->get(name);
if (atomicName)
set->add(atomicName);
}
static void buildQuirksSets()
{
// FIXME: Having isJapaneseEncoding() and shouldShowBackslashAsCurrencySymbolIn()
// and initializing the sets for them in TextEncodingRegistry.cpp look strange.
ASSERT(!japaneseEncodings);
ASSERT(!nonBackslashEncodings);
japaneseEncodings = new HashSet<const char*>;
addEncodingName(japaneseEncodings, "EUC-JP");
addEncodingName(japaneseEncodings, "ISO-2022-JP");
addEncodingName(japaneseEncodings, "ISO-2022-JP-1");
addEncodingName(japaneseEncodings, "ISO-2022-JP-2");
addEncodingName(japaneseEncodings, "ISO-2022-JP-3");
addEncodingName(japaneseEncodings, "JIS_C6226-1978");
addEncodingName(japaneseEncodings, "JIS_X0201");
addEncodingName(japaneseEncodings, "JIS_X0208-1983");
addEncodingName(japaneseEncodings, "JIS_X0208-1990");
addEncodingName(japaneseEncodings, "JIS_X0212-1990");
addEncodingName(japaneseEncodings, "Shift_JIS");
addEncodingName(japaneseEncodings, "Shift_JIS_X0213-2000");
addEncodingName(japaneseEncodings, "cp932");
addEncodingName(japaneseEncodings, "x-mac-japanese");
nonBackslashEncodings = new HashSet<const char*>;
// The text encodings below treat backslash as a currency symbol for IE compatibility.
// See http://blogs.msdn.com/michkap/archive/2005/09/17/469941.aspx for more information.
addEncodingName(nonBackslashEncodings, "x-mac-japanese");
addEncodingName(nonBackslashEncodings, "ISO-2022-JP");
addEncodingName(nonBackslashEncodings, "EUC-JP");
// Shift_JIS_X0213-2000 is not the same encoding as Shift_JIS on Mac. We need to register both of them.
addEncodingName(nonBackslashEncodings, "Shift_JIS");
addEncodingName(nonBackslashEncodings, "Shift_JIS_X0213-2000");
}
bool isJapaneseEncoding(const char* canonicalEncodingName)
{
return canonicalEncodingName && japaneseEncodings && japaneseEncodings->contains(canonicalEncodingName);
}
bool shouldShowBackslashAsCurrencySymbolIn(const char* canonicalEncodingName)
{
return canonicalEncodingName && nonBackslashEncodings && nonBackslashEncodings->contains(canonicalEncodingName);
}
static void extendTextCodecMaps()
{
#if USE(ICU_UNICODE)
TextCodecICU::registerExtendedEncodingNames(addToTextEncodingNameMap);
TextCodecICU::registerExtendedCodecs(addToTextCodecMap);
#endif
#if USE(QT4_UNICODE)
TextCodecQt::registerEncodingNames(addToTextEncodingNameMap);
TextCodecQt::registerCodecs(addToTextCodecMap);
#endif
#if PLATFORM(MAC)
TextCodecMac::registerEncodingNames(addToTextEncodingNameMap);
TextCodecMac::registerCodecs(addToTextCodecMap);
#endif
#if USE(GLIB_UNICODE)
TextCodecGtk::registerExtendedEncodingNames(addToTextEncodingNameMap);
TextCodecGtk::registerExtendedCodecs(addToTextCodecMap);
#endif
#if OS(WINCE) && !PLATFORM(QT)
TextCodecWinCE::registerExtendedEncodingNames(addToTextEncodingNameMap);
TextCodecWinCE::registerExtendedCodecs(addToTextCodecMap);
#endif
pruneBlacklistedCodecs();
buildQuirksSets();
}
PassOwnPtr<TextCodec> newTextCodec(const TextEncoding& encoding)
{
MutexLocker lock(encodingRegistryMutex());
ASSERT(textCodecMap);
TextCodecFactory factory = textCodecMap->get(encoding.name());
ASSERT(factory.function);
return factory.function(encoding, factory.additionalData);
}
const char* atomicCanonicalTextEncodingName(const char* name)
{
if (!name || !name[0])
return 0;
if (!textEncodingNameMap)
buildBaseTextCodecMaps();
MutexLocker lock(encodingRegistryMutex());
if (const char* atomicName = textEncodingNameMap->get(name))
return atomicName;
if (didExtendTextCodecMaps)
return 0;
extendTextCodecMaps();
didExtendTextCodecMaps = true;
return textEncodingNameMap->get(name);
}
const char* atomicCanonicalTextEncodingName(const UChar* characters, size_t length)
{
char buffer[maxEncodingNameLength + 1];
size_t j = 0;
for (size_t i = 0; i < length; ++i) {
UChar c = characters[i];
if (j == maxEncodingNameLength)
return 0;
buffer[j++] = c;
}
buffer[j] = 0;
return atomicCanonicalTextEncodingName(buffer);
}
bool noExtendedTextEncodingNameUsed()
{
// If the calling thread did not use extended encoding names, it is fine for it to use a stale false value.
return !didExtendTextCodecMaps;
}
#ifndef NDEBUG
void dumpTextEncodingNameMap()
{
unsigned size = textEncodingNameMap->size();
fprintf(stderr, "Dumping %u entries in WebCore::textEncodingNameMap...\n", size);
MutexLocker lock(encodingRegistryMutex());
TextEncodingNameMap::const_iterator it = textEncodingNameMap->begin();
TextEncodingNameMap::const_iterator end = textEncodingNameMap->end();
for (; it != end; ++it)
fprintf(stderr, "'%s' => '%s'\n", it->first, it->second);
}
#endif
} // namespace WebCore
|