1/*
2 * Copyright (C) 2004-2017 Apple Inc. All rights reserved.
3 * Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "TextCodecICU.h"
29
30#include "TextEncoding.h"
31#include "TextEncodingRegistry.h"
32#include "ThreadGlobalData.h"
33#include <array>
34#include <unicode/ucnv_cb.h>
35#include <wtf/Threading.h>
36#include <wtf/text/CString.h>
37#include <wtf/text/StringBuilder.h>
38#include <wtf/unicode/CharacterNames.h>
39
40namespace WebCore {
41
42const size_t ConversionBufferSize = 16384;
43
44#define DECLARE_ALIASES(encoding, ...) \
45 static const char* const encoding##_aliases[] { __VA_ARGS__ }
46
47// From https://encoding.spec.whatwg.org. Plus a few extra aliases that macOS had historically from TEC.
48DECLARE_ALIASES(IBM866, "866", "cp866", "csibm866");
49DECLARE_ALIASES(ISO_8859_2, "csisolatin2", "iso-ir-101", "iso8859-2", "iso88592", "iso_8859-2", "iso_8859-2:1987", "l2", "latin2");
50DECLARE_ALIASES(ISO_8859_3, "csisolatin3", "iso-ir-109", "iso8859-3", "iso88593", "iso_8859-3", "iso_8859-3:1988", "l3", "latin3");
51DECLARE_ALIASES(ISO_8859_4, "csisolatin4", "iso-ir-110", "iso8859-4", "iso88594", "iso_8859-4", "iso_8859-4:1988", "l4", "latin4");
52DECLARE_ALIASES(ISO_8859_5, "csisolatincyrillic", "cyrillic", "iso-ir-144", "iso8859-5", "iso88595", "iso_8859-5", "iso_8859-5:1988");
53DECLARE_ALIASES(ISO_8859_6, "arabic", "asmo-708", "csiso88596e", "csiso88596i", "csisolatinarabic", "ecma-114", "iso-8859-6-e", "iso-8859-6-i", "iso-ir-127", "iso8859-6", "iso88596", "iso_8859-6", "iso_8859-6:1987");
54DECLARE_ALIASES(ISO_8859_7, "csisolatingreek", "ecma-118", "elot_928", "greek", "greek8", "iso-ir-126", "iso8859-7", "iso88597", "iso_8859-7", "iso_8859-7:1987", "sun_eu_greek");
55DECLARE_ALIASES(ISO_8859_8, "csiso88598e", "csisolatinhebrew", "hebrew", "iso-8859-8-e", "iso-ir-138", "iso8859-8", "iso88598", "iso_8859-8", "iso_8859-8:1988", "visual");
56DECLARE_ALIASES(ISO_8859_8_I, "csiso88598i", "logical");
57DECLARE_ALIASES(ISO_8859_10, "csisolatin6", "iso-ir-157", "iso8859-10", "iso885910", "l6", "latin6", "iso8859101992", "isoir157");
58DECLARE_ALIASES(ISO_8859_13, "iso8859-13", "iso885913");
59DECLARE_ALIASES(ISO_8859_14, "iso8859-14", "iso885914", "isoceltic", "iso8859141998", "isoir199", "latin8", "l8");
60DECLARE_ALIASES(ISO_8859_15, "csisolatin9", "iso8859-15", "iso885915", "iso_8859-15", "l9");
61DECLARE_ALIASES(ISO_8859_16, "isoir226", "iso8859162001", "l10", "latin10");
62DECLARE_ALIASES(KOI8_R, "cskoi8r", "koi", "koi8", "koi8_r");
63DECLARE_ALIASES(KOI8_U, "koi8-ru");
64DECLARE_ALIASES(macintosh, "csmacintosh", "mac", "x-mac-roman", "macroman", "x-macroman");
65DECLARE_ALIASES(windows_874, "dos-874", "iso-8859-11", "iso8859-11", "iso885911", "tis-620");
66DECLARE_ALIASES(EUC_KR, "windows-949", "cseuckr", "csksc56011987", "iso-ir-149", "korean", "ks_c_5601-1987", "ks_c_5601-1989", "ksc5601", "ksc_5601", "ms949", "x-KSC5601", "x-windows-949", "x-uhc");
67DECLARE_ALIASES(windows_1250, "cp1250", "x-cp1250", "winlatin2");
68DECLARE_ALIASES(windows_1251, "cp1251", "wincyrillic", "x-cp1251");
69DECLARE_ALIASES(windows_1253, "wingreek", "cp1253", "x-cp1253");
70DECLARE_ALIASES(windows_1254, "winturkish", "cp1254", "csisolatin5", "iso-8859-9", "iso-ir-148", "iso8859-9", "iso88599", "iso_8859-9", "iso_8859-9:1989", "l5", "latin5", "x-cp1254");
71DECLARE_ALIASES(windows_1255, "winhebrew", "cp1255", "x-cp1255");
72DECLARE_ALIASES(windows_1256, "winarabic", "cp1256", "x-cp1256");
73DECLARE_ALIASES(windows_1257, "winbaltic", "cp1257", "x-cp1257");
74DECLARE_ALIASES(windows_1258, "winvietnamese", "cp1258", "x-cp1258");
75DECLARE_ALIASES(x_mac_cyrillic, "maccyrillic", "x-mac-ukrainian", "windows-10007", "mac-cyrillic", "maccy", "x-MacCyrillic", "x-MacUkraine");
76DECLARE_ALIASES(GBK, "cn-gb", "csgb231280", "x-euc-cn", "chinese", "csgb2312", "csiso58gb231280", "gb2312", "gb_2312", "gb_2312-80", "iso-ir-58", "x-gbk", "euc-cn", "cp936", "ms936", "gb2312-1980", "windows-936", "windows-936-2000");
77DECLARE_ALIASES(gb18030, "ibm-1392", "windows-54936");
78DECLARE_ALIASES(Big5, "cn-big5", "x-x-big5", "csbig5", "windows-950", "windows-950-2000", "ms950", "x-windows-950", "x-big5");
79DECLARE_ALIASES(EUC_JP, "x-euc", "cseucpkdfmtjapanese", "x-euc-jp");
80DECLARE_ALIASES(ISO_2022_JP, "jis7", "csiso2022jp");
81DECLARE_ALIASES(Shift_JIS, "shift-jis", "csshiftjis", "ms932", "ms_kanji", "sjis", "windows-31j", "x-sjis");
82// Encodings below are not in the standard.
83DECLARE_ALIASES(x_mac_greek, "windows-10006", "macgr", "x-MacGreek");
84DECLARE_ALIASES(x_mac_centraleurroman, "windows-10029", "x-mac-ce", "macce", "maccentraleurope", "x-MacCentralEurope");
85DECLARE_ALIASES(x_mac_turkish, "windows-10081", "mactr", "x-MacTurkish");
86DECLARE_ALIASES(Big5_HKSCS, "big5hk", "HKSCS-BIG5", "ibm-1375", "ibm-1375_P100-2008");
87
88#define DECLARE_ENCODING_NAME(encoding, alias_array) \
89 { encoding, WTF_ARRAY_LENGTH(alias_array##_aliases), alias_array##_aliases }
90
91#define DECLARE_ENCODING_NAME_NO_ALIASES(encoding) \
92 { encoding, 0, nullptr }
93
94static const struct EncodingName {
95 const char* name;
96 unsigned aliasCount;
97 const char* const * aliases;
98} encodingNames[] = {
99 DECLARE_ENCODING_NAME("IBM866", IBM866),
100 DECLARE_ENCODING_NAME("ISO-8859-2", ISO_8859_2),
101 DECLARE_ENCODING_NAME("ISO-8859-3", ISO_8859_3),
102 DECLARE_ENCODING_NAME("ISO-8859-4", ISO_8859_4),
103 DECLARE_ENCODING_NAME("ISO-8859-5", ISO_8859_5),
104 DECLARE_ENCODING_NAME("ISO-8859-6", ISO_8859_6),
105 DECLARE_ENCODING_NAME("ISO-8859-7", ISO_8859_7),
106 DECLARE_ENCODING_NAME("ISO-8859-8", ISO_8859_8),
107 DECLARE_ENCODING_NAME("ISO-8859-8-I", ISO_8859_8_I),
108 DECLARE_ENCODING_NAME("ISO-8859-10", ISO_8859_10),
109 DECLARE_ENCODING_NAME("ISO-8859-13", ISO_8859_13),
110 DECLARE_ENCODING_NAME("ISO-8859-14", ISO_8859_14),
111 DECLARE_ENCODING_NAME("ISO-8859-15", ISO_8859_15),
112 DECLARE_ENCODING_NAME("ISO-8859-16", ISO_8859_16),
113 DECLARE_ENCODING_NAME("KOI8-R", KOI8_R),
114 DECLARE_ENCODING_NAME("KOI8-U", KOI8_U),
115 DECLARE_ENCODING_NAME("macintosh", macintosh),
116 DECLARE_ENCODING_NAME("windows-874", windows_874),
117 DECLARE_ENCODING_NAME("EUC-KR", EUC_KR),
118 DECLARE_ENCODING_NAME("windows-1250", windows_1250),
119 DECLARE_ENCODING_NAME("windows-1251", windows_1251),
120 DECLARE_ENCODING_NAME("windows-1253", windows_1253),
121 DECLARE_ENCODING_NAME("windows-1254", windows_1254),
122 DECLARE_ENCODING_NAME("windows-1255", windows_1255),
123 DECLARE_ENCODING_NAME("windows-1256", windows_1256),
124 DECLARE_ENCODING_NAME("windows-1257", windows_1257),
125 DECLARE_ENCODING_NAME("windows-1258", windows_1258),
126 DECLARE_ENCODING_NAME("x-mac-cyrillic", x_mac_cyrillic),
127 DECLARE_ENCODING_NAME("GBK", GBK),
128 DECLARE_ENCODING_NAME("gb18030", gb18030),
129 DECLARE_ENCODING_NAME("Big5", Big5),
130 DECLARE_ENCODING_NAME("EUC-JP", EUC_JP),
131 DECLARE_ENCODING_NAME("ISO-2022-JP", ISO_2022_JP),
132 DECLARE_ENCODING_NAME("Shift_JIS", Shift_JIS),
133 // Encodings below are not in the standard.
134 DECLARE_ENCODING_NAME("x-mac-greek", x_mac_greek),
135 DECLARE_ENCODING_NAME("x-mac-centraleurroman", x_mac_centraleurroman),
136 DECLARE_ENCODING_NAME("x-mac-turkish", x_mac_turkish),
137 DECLARE_ENCODING_NAME("Big5-HKSCS", Big5_HKSCS),
138 DECLARE_ENCODING_NAME_NO_ALIASES("EUC-TW"),
139};
140
141void TextCodecICU::registerEncodingNames(EncodingNameRegistrar registrar)
142{
143 for (auto& encodingName : encodingNames) {
144 registrar(encodingName.name, encodingName.name);
145 for (size_t i = 0; i < encodingName.aliasCount; ++i)
146 registrar(encodingName.aliases[i], encodingName.name);
147 }
148}
149
150void TextCodecICU::registerCodecs(TextCodecRegistrar registrar)
151{
152 for (auto& encodingName : encodingNames) {
153 const char* name = encodingName.name;
154
155 // These encodings currently don't have standard names, so we need to register encoders manually.
156 // http://demo.icu-project.org/icu-bin/convexp
157 if (!strcmp(name, "windows-874")) {
158 registrar(name, [name] {
159 return std::make_unique<TextCodecICU>(name, "windows-874-2000");
160 });
161 continue;
162 }
163 if (!strcmp(name, "windows-949")) {
164 registrar(name, [name] {
165 return std::make_unique<TextCodecICU>(name, "windows-949-2000");
166 });
167 continue;
168 }
169 if (!strcmp(name, "x-mac-cyrillic")) {
170 registrar(name, [name] {
171 return std::make_unique<TextCodecICU>(name, "macos-7_3-10.2");
172 });
173 continue;
174 }
175 if (!strcmp(name, "x-mac-greek")) {
176 registrar(name, [name] {
177 return std::make_unique<TextCodecICU>(name, "macos-6_2-10.4");
178 });
179 continue;
180 }
181 if (!strcmp(name, "x-mac-centraleurroman")) {
182 registrar(name, [name] {
183 return std::make_unique<TextCodecICU>(name, "macos-29-10.2");
184 });
185 continue;
186 }
187 if (!strcmp(name, "x-mac-turkish")) {
188 registrar(name, [name] {
189 return std::make_unique<TextCodecICU>(name, "macos-35-10.2");
190 });
191 continue;
192 }
193 if (!strcmp(name, "EUC-KR")) {
194 registrar(name, [name] {
195 return std::make_unique<TextCodecICU>(name, "windows-949");
196 });
197 continue;
198 }
199
200 UErrorCode error = U_ZERO_ERROR;
201 const char* canonicalConverterName = ucnv_getCanonicalName(name, "IANA", &error);
202 ASSERT(U_SUCCESS(error));
203 registrar(name, [name, canonicalConverterName] {
204 return std::make_unique<TextCodecICU>(name, canonicalConverterName);
205 });
206 }
207}
208
209TextCodecICU::TextCodecICU(const char* encoding, const char* canonicalConverterName)
210 : m_encodingName(encoding)
211 , m_canonicalConverterName(canonicalConverterName)
212{
213}
214
215TextCodecICU::~TextCodecICU()
216{
217 if (m_converter) {
218 ucnv_reset(m_converter.get());
219 threadGlobalData().cachedConverterICU().converter = WTFMove(m_converter);
220 }
221}
222
223void TextCodecICU::createICUConverter() const
224{
225 ASSERT(!m_converter);
226
227 m_needsGBKFallbacks = !strcmp(m_encodingName, "GBK");
228
229 auto& cachedConverter = threadGlobalData().cachedConverterICU().converter;
230 if (cachedConverter) {
231 UErrorCode error = U_ZERO_ERROR;
232 const char* cachedConverterName = ucnv_getName(cachedConverter.get(), &error);
233 if (U_SUCCESS(error) && !strcmp(m_canonicalConverterName, cachedConverterName)) {
234 m_converter = WTFMove(cachedConverter);
235 return;
236 }
237 }
238
239 UErrorCode error = U_ZERO_ERROR;
240 m_converter = ICUConverterPtr { ucnv_open(m_canonicalConverterName, &error), ucnv_close };
241 if (m_converter)
242 ucnv_setFallback(m_converter.get(), TRUE);
243}
244
245int TextCodecICU::decodeToBuffer(UChar* target, UChar* targetLimit, const char*& source, const char* sourceLimit, int32_t* offsets, bool flush, UErrorCode& error)
246{
247 UChar* targetStart = target;
248 error = U_ZERO_ERROR;
249 ucnv_toUnicode(m_converter.get(), &target, targetLimit, &source, sourceLimit, offsets, flush, &error);
250 return target - targetStart;
251}
252
253class ErrorCallbackSetter {
254public:
255 ErrorCallbackSetter(UConverter& converter, bool stopOnError)
256 : m_converter(converter)
257 , m_shouldStopOnEncodingErrors(stopOnError)
258 {
259 if (m_shouldStopOnEncodingErrors) {
260 UErrorCode err = U_ZERO_ERROR;
261 ucnv_setToUCallBack(&m_converter, UCNV_TO_U_CALLBACK_SUBSTITUTE, UCNV_SUB_STOP_ON_ILLEGAL, &m_savedAction, &m_savedContext, &err);
262 ASSERT(err == U_ZERO_ERROR);
263 }
264 }
265 ~ErrorCallbackSetter()
266 {
267 if (m_shouldStopOnEncodingErrors) {
268 UErrorCode err = U_ZERO_ERROR;
269 const void* oldContext;
270 UConverterToUCallback oldAction;
271 ucnv_setToUCallBack(&m_converter, m_savedAction, m_savedContext, &oldAction, &oldContext, &err);
272 ASSERT(oldAction == UCNV_TO_U_CALLBACK_SUBSTITUTE);
273 ASSERT(!strcmp(static_cast<const char*>(oldContext), UCNV_SUB_STOP_ON_ILLEGAL));
274 ASSERT(err == U_ZERO_ERROR);
275 }
276 }
277
278private:
279 UConverter& m_converter;
280 bool m_shouldStopOnEncodingErrors;
281 const void* m_savedContext;
282 UConverterToUCallback m_savedAction;
283};
284
285String TextCodecICU::decode(const char* bytes, size_t length, bool flush, bool stopOnError, bool& sawError)
286{
287 // Get a converter for the passed-in encoding.
288 if (!m_converter) {
289 createICUConverter();
290 if (!m_converter) {
291 LOG_ERROR("error creating ICU encoder even though encoding was in table");
292 sawError = true;
293 return { };
294 }
295 }
296
297 ErrorCallbackSetter callbackSetter(*m_converter, stopOnError);
298
299 StringBuilder result;
300
301 UChar buffer[ConversionBufferSize];
302 UChar* bufferLimit = buffer + ConversionBufferSize;
303 const char* source = reinterpret_cast<const char*>(bytes);
304 const char* sourceLimit = source + length;
305 int32_t* offsets = NULL;
306 UErrorCode err = U_ZERO_ERROR;
307
308 do {
309 int ucharsDecoded = decodeToBuffer(buffer, bufferLimit, source, sourceLimit, offsets, flush, err);
310 result.append(buffer, ucharsDecoded);
311 } while (err == U_BUFFER_OVERFLOW_ERROR);
312
313 if (U_FAILURE(err)) {
314 // flush the converter so it can be reused, and not be bothered by this error.
315 do {
316 decodeToBuffer(buffer, bufferLimit, source, sourceLimit, offsets, true, err);
317 } while (source < sourceLimit);
318 sawError = true;
319 }
320
321 String resultString = result.toString();
322
323 // Simplified Chinese pages use the code A3A0 to mean "full-width space", but ICU decodes it as U+E5E5.
324 if (!strcmp(m_encodingName, "GBK") || equalLettersIgnoringASCIICase(m_encodingName, "gb18030"))
325 resultString.replace(0xE5E5, ideographicSpace);
326
327 return resultString;
328}
329
330// We need to apply these fallbacks ourselves as they are not currently supported by ICU and
331// they were provided by the Mac TEC encoding path. Needed to fix <rdar://problem/4708689>.
332static UChar fallbackForGBK(UChar32 character)
333{
334 switch (character) {
335 case 0x01F9:
336 return 0xE7C8;
337 case 0x1E3F:
338 return 0xE7C7;
339 case 0x22EF:
340 return 0x2026;
341 case 0x301C:
342 return 0xFF5E;
343 }
344 return 0;
345}
346
347// Invalid character handler when writing escaped entities for unrepresentable
348// characters. See the declaration of TextCodec::encode for more.
349static void urlEscapedEntityCallback(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
350 UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* error)
351{
352 if (reason == UCNV_UNASSIGNED) {
353 *error = U_ZERO_ERROR;
354 UnencodableReplacementArray entity;
355 int entityLen = TextCodec::getUnencodableReplacement(codePoint, UnencodableHandling::URLEncodedEntities, entity);
356 ucnv_cbFromUWriteBytes(fromUArgs, entity.data(), entityLen, 0, error);
357 } else
358 UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, error);
359}
360
361// Substitutes special GBK characters, escaping all other unassigned entities.
362static void gbkCallbackEscape(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
363 UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* error)
364{
365 UChar outChar;
366 if (reason == UCNV_UNASSIGNED && (outChar = fallbackForGBK(codePoint))) {
367 const UChar* source = &outChar;
368 *error = U_ZERO_ERROR;
369 ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, error);
370 return;
371 }
372 UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, error);
373}
374
375// Combines both gbkUrlEscapedEntityCallback and GBK character substitution.
376static void gbkUrlEscapedEntityCallack(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
377 UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* error)
378{
379 if (reason == UCNV_UNASSIGNED) {
380 if (UChar outChar = fallbackForGBK(codePoint)) {
381 const UChar* source = &outChar;
382 *error = U_ZERO_ERROR;
383 ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, error);
384 return;
385 }
386 urlEscapedEntityCallback(context, fromUArgs, codeUnits, length, codePoint, reason, error);
387 return;
388 }
389 UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, error);
390}
391
392static void gbkCallbackSubstitute(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
393 UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* error)
394{
395 UChar outChar;
396 if (reason == UCNV_UNASSIGNED && (outChar = fallbackForGBK(codePoint))) {
397 const UChar* source = &outChar;
398 *error = U_ZERO_ERROR;
399 ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, error);
400 return;
401 }
402 UCNV_FROM_U_CALLBACK_SUBSTITUTE(context, fromUArgs, codeUnits, length, codePoint, reason, error);
403}
404
405Vector<uint8_t> TextCodecICU::encode(StringView string, UnencodableHandling handling)
406{
407 if (string.isEmpty())
408 return { };
409
410 if (!m_converter) {
411 createICUConverter();
412 if (!m_converter)
413 return { };
414 }
415
416 // FIXME: We should see if there is "force ASCII range" mode in ICU;
417 // until then, we change the backslash into a yen sign.
418 // Encoding will change the yen sign back into a backslash.
419 String copy;
420 if (shouldShowBackslashAsCurrencySymbolIn(m_encodingName)) {
421 copy = string.toStringWithoutCopying();
422 copy.replace('\\', yenSign);
423 string = copy;
424 }
425
426 UErrorCode error;
427 switch (handling) {
428 case UnencodableHandling::QuestionMarks:
429 error = U_ZERO_ERROR;
430 ucnv_setSubstChars(m_converter.get(), "?", 1, &error);
431 if (U_FAILURE(error))
432 return { };
433 error = U_ZERO_ERROR;
434 ucnv_setFromUCallBack(m_converter.get(), m_needsGBKFallbacks ? gbkCallbackSubstitute : UCNV_FROM_U_CALLBACK_SUBSTITUTE, 0, 0, 0, &error);
435 if (U_FAILURE(error))
436 return { };
437 break;
438 case UnencodableHandling::Entities:
439 error = U_ZERO_ERROR;
440 ucnv_setFromUCallBack(m_converter.get(), m_needsGBKFallbacks ? gbkCallbackEscape : UCNV_FROM_U_CALLBACK_ESCAPE, UCNV_ESCAPE_XML_DEC, 0, 0, &error);
441 if (U_FAILURE(error))
442 return { };
443 break;
444 case UnencodableHandling::URLEncodedEntities:
445 error = U_ZERO_ERROR;
446 ucnv_setFromUCallBack(m_converter.get(), m_needsGBKFallbacks ? gbkUrlEscapedEntityCallack : urlEscapedEntityCallback, 0, 0, 0, &error);
447 if (U_FAILURE(error))
448 return { };
449 break;
450 }
451
452 auto upconvertedCharacters = string.upconvertedCharacters();
453 auto* source = upconvertedCharacters.get();
454 auto* sourceLimit = source + string.length();
455
456 Vector<uint8_t> result;
457 do {
458 char buffer[ConversionBufferSize];
459 char* target = buffer;
460 char* targetLimit = target + ConversionBufferSize;
461 error = U_ZERO_ERROR;
462 ucnv_fromUnicode(m_converter.get(), &target, targetLimit, &source, sourceLimit, 0, true, &error);
463 result.append(reinterpret_cast<uint8_t*>(buffer), target - buffer);
464 } while (error == U_BUFFER_OVERFLOW_ERROR);
465 return result;
466}
467
468} // namespace WebCore
469