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flutter_flutter/sky/engine/wtf/text/TextCodecICU.cpp
Adam Barth 9c09565712 Update paths to account for buildroot
2016-08-09 13:52:15 -07:00

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/*
* Copyright (C) 2004, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
*
* 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 "flutter/sky/engine/wtf/text/TextCodecICU.h"
#include <unicode/ucnv.h>
#include <unicode/ucnv_cb.h>
#include "flutter/sky/engine/wtf/Assertions.h"
#include "flutter/sky/engine/wtf/StringExtras.h"
#include "flutter/sky/engine/wtf/Threading.h"
#include "flutter/sky/engine/wtf/WTFThreadData.h"
#include "flutter/sky/engine/wtf/text/CString.h"
#include "flutter/sky/engine/wtf/text/StringBuilder.h"
#include "flutter/sky/engine/wtf/unicode/CharacterNames.h"
using std::min;
namespace WTF {
const size_t ConversionBufferSize = 16384;
ICUConverterWrapper::~ICUConverterWrapper()
{
if (converter)
ucnv_close(converter);
}
static UConverter*& cachedConverterICU()
{
return wtfThreadData().cachedConverterICU().converter;
}
PassOwnPtr<TextCodec> TextCodecICU::create(const TextEncoding& encoding, const void*)
{
return adoptPtr(new TextCodecICU(encoding));
}
void TextCodecICU::registerEncodingNames(EncodingNameRegistrar registrar)
{
// We register Hebrew with logical ordering using a separate name.
// Otherwise, this would share the same canonical name as the
// visual ordering case, and then TextEncoding could not tell them
// apart; ICU treats these names as synonyms.
registrar("ISO-8859-8-I", "ISO-8859-8-I");
int32_t numEncodings = ucnv_countAvailable();
for (int32_t i = 0; i < numEncodings; ++i) {
const char* name = ucnv_getAvailableName(i);
UErrorCode error = U_ZERO_ERROR;
// Try MIME before trying IANA to pick up commonly used names like
// 'EUC-JP' instead of horrendously long names like
// 'Extended_UNIX_Code_Packed_Format_for_Japanese'.
const char* standardName = ucnv_getStandardName(name, "MIME", &error);
if (!U_SUCCESS(error) || !standardName) {
error = U_ZERO_ERROR;
// Try IANA to pick up 'windows-12xx' and other names
// which are not preferred MIME names but are widely used.
standardName = ucnv_getStandardName(name, "IANA", &error);
if (!U_SUCCESS(error) || !standardName)
continue;
}
// A number of these aliases are handled in Chrome's copy of ICU, but
// Chromium can be compiled with the system ICU.
// 1. Treat GB2312 encoding as GBK (its more modern superset), to match other browsers.
// 2. On the Web, GB2312 is encoded as EUC-CN or HZ, while ICU provides a native encoding
// for encoding GB_2312-80 and several others. So, we need to override this behavior, too.
if (!strcmp(standardName, "GB2312") || !strcmp(standardName, "GB_2312-80"))
standardName = "GBK";
// Similarly, EUC-KR encodings all map to an extended version, but
// per HTML5, the canonical name still should be EUC-KR.
else if (!strcmp(standardName, "EUC-KR") || !strcmp(standardName, "KSC_5601") || !strcmp(standardName, "cp1363"))
standardName = "EUC-KR";
// And so on.
else if (!strcasecmp(standardName, "iso-8859-9")) // This name is returned in different case by ICU 3.2 and 3.6.
standardName = "windows-1254";
else if (!strcmp(standardName, "TIS-620"))
standardName = "windows-874";
registrar(standardName, standardName);
uint16_t numAliases = ucnv_countAliases(name, &error);
ASSERT(U_SUCCESS(error));
if (U_SUCCESS(error))
for (uint16_t j = 0; j < numAliases; ++j) {
error = U_ZERO_ERROR;
const char* alias = ucnv_getAlias(name, j, &error);
ASSERT(U_SUCCESS(error));
if (U_SUCCESS(error) && alias != standardName)
registrar(alias, standardName);
}
}
// Additional alias for MacCyrillic not present in ICU.
registrar("maccyrillic", "x-mac-cyrillic");
// Additional aliases that historically were present in the encoding
// table in WebKit on Macintosh that don't seem to be present in ICU.
// Perhaps we can prove these are not used on the web and remove them.
// Or perhaps we can get them added to ICU.
registrar("x-mac-roman", "macintosh");
registrar("x-mac-ukrainian", "x-mac-cyrillic");
registrar("cn-big5", "Big5");
registrar("x-x-big5", "Big5");
registrar("cn-gb", "GBK");
registrar("csgb231280", "GBK");
registrar("x-euc-cn", "GBK");
registrar("x-gbk", "GBK");
registrar("csISO88598I", "ISO-8859-8-I");
registrar("koi", "KOI8-R");
registrar("logical", "ISO-8859-8-I");
registrar("visual", "ISO-8859-8");
registrar("winarabic", "windows-1256");
registrar("winbaltic", "windows-1257");
registrar("wincyrillic", "windows-1251");
registrar("iso-8859-11", "windows-874");
registrar("iso8859-11", "windows-874");
registrar("dos-874", "windows-874");
registrar("wingreek", "windows-1253");
registrar("winhebrew", "windows-1255");
registrar("winlatin2", "windows-1250");
registrar("winturkish", "windows-1254");
registrar("winvietnamese", "windows-1258");
registrar("x-cp1250", "windows-1250");
registrar("x-cp1251", "windows-1251");
registrar("x-euc", "EUC-JP");
registrar("x-windows-949", "EUC-KR");
registrar("KSC5601", "EUC-KR");
registrar("x-uhc", "EUC-KR");
registrar("shift-jis", "Shift_JIS");
// Alternative spelling of ISO encoding names.
registrar("ISO8859-1", "ISO-8859-1");
registrar("ISO8859-2", "ISO-8859-2");
registrar("ISO8859-3", "ISO-8859-3");
registrar("ISO8859-4", "ISO-8859-4");
registrar("ISO8859-5", "ISO-8859-5");
registrar("ISO8859-6", "ISO-8859-6");
registrar("ISO8859-7", "ISO-8859-7");
registrar("ISO8859-8", "ISO-8859-8");
registrar("ISO8859-8-I", "ISO-8859-8-I");
registrar("ISO8859-9", "ISO-8859-9");
registrar("ISO8859-10", "ISO-8859-10");
registrar("ISO8859-13", "ISO-8859-13");
registrar("ISO8859-14", "ISO-8859-14");
registrar("ISO8859-15", "ISO-8859-15");
// No need to have an entry for ISO8859-16. ISO-8859-16 has just one label
// listed in WHATWG Encoding Living Standard (http://encoding.spec.whatwg.org/ ).
// Additional aliases present in the WHATWG Encoding Standard
// and Firefox (24), but not in ICU 4.6.
registrar("csiso58gb231280", "GBK");
registrar("csiso88596e", "ISO-8859-6");
registrar("csiso88596i", "ISO-8859-6");
registrar("csiso88598e", "ISO-8859-8");
registrar("gb_2312", "GBK");
registrar("iso88591", "windows-1252");
registrar("iso88592", "ISO-8859-2");
registrar("iso88593", "ISO-8859-3");
registrar("iso88594", "ISO-8859-4");
registrar("iso88595", "ISO-8859-5");
registrar("iso88596", "ISO-8859-6");
registrar("iso88597", "ISO-8859-7");
registrar("iso88598", "ISO-8859-8");
registrar("iso88599", "windows-1254");
registrar("iso885910", "ISO-8859-10");
registrar("iso885911", "windows-874");
registrar("iso885913", "ISO-8859-13");
registrar("iso885914", "ISO-8859-14");
registrar("iso885915", "ISO-8859-15");
registrar("iso_8859-1", "windows-1252");
registrar("iso_8859-2", "ISO-8859-2");
registrar("iso_8859-3", "ISO-8859-3");
registrar("iso_8859-4", "ISO-8859-4");
registrar("iso_8859-5", "ISO-8859-5");
registrar("iso_8859-6", "ISO-8859-6");
registrar("iso_8859-7", "ISO-8859-7");
registrar("iso_8859-8", "ISO-8859-8");
registrar("iso_8859-9", "windows-1254");
registrar("iso_8859-15", "ISO-8859-15");
registrar("koi8_r", "KOI8-R");
registrar("x-cp1252", "windows-1252");
registrar("x-cp1253", "windows-1253");
registrar("x-cp1254", "windows-1254");
registrar("x-cp1255", "windows-1255");
registrar("x-cp1256", "windows-1256");
registrar("x-cp1257", "windows-1257");
registrar("x-cp1258", "windows-1258");
}
void TextCodecICU::registerCodecs(TextCodecRegistrar registrar)
{
// See comment above in registerEncodingNames.
registrar("ISO-8859-8-I", create, 0);
int32_t numEncodings = ucnv_countAvailable();
for (int32_t i = 0; i < numEncodings; ++i) {
const char* name = ucnv_getAvailableName(i);
UErrorCode error = U_ZERO_ERROR;
const char* standardName = ucnv_getStandardName(name, "MIME", &error);
if (!U_SUCCESS(error) || !standardName) {
error = U_ZERO_ERROR;
standardName = ucnv_getStandardName(name, "IANA", &error);
if (!U_SUCCESS(error) || !standardName)
continue;
}
registrar(standardName, create, 0);
}
}
TextCodecICU::TextCodecICU(const TextEncoding& encoding)
: m_encoding(encoding)
, m_converterICU(0)
, m_needsGBKFallbacks(false)
{
}
TextCodecICU::~TextCodecICU()
{
releaseICUConverter();
}
void TextCodecICU::releaseICUConverter() const
{
if (m_converterICU) {
UConverter*& cachedConverter = cachedConverterICU();
if (cachedConverter)
ucnv_close(cachedConverter);
cachedConverter = m_converterICU;
m_converterICU = 0;
}
}
void TextCodecICU::createICUConverter() const
{
ASSERT(!m_converterICU);
const char* name = m_encoding.name();
m_needsGBKFallbacks = name[0] == 'G' && name[1] == 'B' && name[2] == 'K' && !name[3];
UErrorCode err;
UConverter*& cachedConverter = cachedConverterICU();
if (cachedConverter) {
err = U_ZERO_ERROR;
const char* cachedName = ucnv_getName(cachedConverter, &err);
if (U_SUCCESS(err) && m_encoding == cachedName) {
m_converterICU = cachedConverter;
cachedConverter = 0;
return;
}
}
err = U_ZERO_ERROR;
m_converterICU = ucnv_open(m_encoding.name(), &err);
#if !LOG_DISABLED
if (err == U_AMBIGUOUS_ALIAS_WARNING)
WTF_LOG_ERROR("ICU ambiguous alias warning for encoding: %s", m_encoding.name());
#endif
if (m_converterICU)
ucnv_setFallback(m_converterICU, TRUE);
}
int TextCodecICU::decodeToBuffer(UChar* target, UChar* targetLimit, const char*& source, const char* sourceLimit, int32_t* offsets, bool flush, UErrorCode& err)
{
UChar* targetStart = target;
err = U_ZERO_ERROR;
ucnv_toUnicode(m_converterICU, &target, targetLimit, &source, sourceLimit, offsets, flush, &err);
return target - targetStart;
}
class ErrorCallbackSetter {
public:
ErrorCallbackSetter(UConverter* converter, bool stopOnError)
: m_converter(converter)
, m_shouldStopOnEncodingErrors(stopOnError)
{
if (m_shouldStopOnEncodingErrors) {
UErrorCode err = U_ZERO_ERROR;
ucnv_setToUCallBack(m_converter, UCNV_TO_U_CALLBACK_SUBSTITUTE,
UCNV_SUB_STOP_ON_ILLEGAL, &m_savedAction,
&m_savedContext, &err);
ASSERT(err == U_ZERO_ERROR);
}
}
~ErrorCallbackSetter()
{
if (m_shouldStopOnEncodingErrors) {
UErrorCode err = U_ZERO_ERROR;
const void* oldContext;
UConverterToUCallback oldAction;
ucnv_setToUCallBack(m_converter, m_savedAction,
m_savedContext, &oldAction,
&oldContext, &err);
ASSERT(oldAction == UCNV_TO_U_CALLBACK_SUBSTITUTE);
ASSERT(!strcmp(static_cast<const char*>(oldContext), UCNV_SUB_STOP_ON_ILLEGAL));
ASSERT(err == U_ZERO_ERROR);
}
}
private:
UConverter* m_converter;
bool m_shouldStopOnEncodingErrors;
const void* m_savedContext;
UConverterToUCallback m_savedAction;
};
String TextCodecICU::decode(const char* bytes, size_t length, FlushBehavior flush, bool stopOnError, bool& sawError)
{
// Get a converter for the passed-in encoding.
if (!m_converterICU) {
createICUConverter();
ASSERT(m_converterICU);
if (!m_converterICU) {
WTF_LOG_ERROR("error creating ICU encoder even though encoding was in table");
return String();
}
}
ErrorCallbackSetter callbackSetter(m_converterICU, stopOnError);
StringBuilder result;
UChar buffer[ConversionBufferSize];
UChar* bufferLimit = buffer + ConversionBufferSize;
const char* source = reinterpret_cast<const char*>(bytes);
const char* sourceLimit = source + length;
int32_t* offsets = NULL;
UErrorCode err = U_ZERO_ERROR;
do {
int ucharsDecoded = decodeToBuffer(buffer, bufferLimit, source, sourceLimit, offsets, flush != DoNotFlush, err);
result.append(buffer, ucharsDecoded);
} while (err == U_BUFFER_OVERFLOW_ERROR);
if (U_FAILURE(err)) {
// flush the converter so it can be reused, and not be bothered by this error.
do {
decodeToBuffer(buffer, bufferLimit, source, sourceLimit, offsets, true, err);
} while (source < sourceLimit);
sawError = true;
}
String resultString = result.toString();
// <http://bugs.webkit.org/show_bug.cgi?id=17014>
// Simplified Chinese pages use the code A3A0 to mean "full-width space", but ICU decodes it as U+E5E5.
if (!strcmp(m_encoding.name(), "GBK") || !strcasecmp(m_encoding.name(), "gb18030"))
resultString.replace(0xE5E5, ideographicSpace);
return resultString;
}
// We need to apply these fallbacks ourselves as they are not currently supported by ICU and
// they were provided by the old TEC encoding path. Needed to fix <rdar://problem/4708689>.
static UChar fallbackForGBK(UChar32 character)
{
switch (character) {
case 0x01F9:
return 0xE7C8;
case 0x1E3F:
return 0xE7C7;
case 0x22EF:
return 0x2026;
case 0x301C:
return 0xFF5E;
}
return 0;
}
// Invalid character handler when writing escaped entities for unrepresentable
// characters. See the declaration of TextCodec::encode for more.
static void urlEscapedEntityCallback(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* err)
{
if (reason == UCNV_UNASSIGNED) {
*err = U_ZERO_ERROR;
UnencodableReplacementArray entity;
int entityLen = TextCodec::getUnencodableReplacement(codePoint, URLEncodedEntitiesForUnencodables, entity);
ucnv_cbFromUWriteBytes(fromUArgs, entity, entityLen, 0, err);
} else
UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, err);
}
// Substitutes special GBK characters, escaping all other unassigned entities.
static void gbkCallbackEscape(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* err)
{
UChar outChar;
if (reason == UCNV_UNASSIGNED && (outChar = fallbackForGBK(codePoint))) {
const UChar* source = &outChar;
*err = U_ZERO_ERROR;
ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, err);
return;
}
UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, err);
}
// Combines both gbkUrlEscapedEntityCallback and GBK character substitution.
static void gbkUrlEscapedEntityCallack(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* err)
{
if (reason == UCNV_UNASSIGNED) {
if (UChar outChar = fallbackForGBK(codePoint)) {
const UChar* source = &outChar;
*err = U_ZERO_ERROR;
ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, err);
return;
}
urlEscapedEntityCallback(context, fromUArgs, codeUnits, length, codePoint, reason, err);
return;
}
UCNV_FROM_U_CALLBACK_ESCAPE(context, fromUArgs, codeUnits, length, codePoint, reason, err);
}
static void gbkCallbackSubstitute(const void* context, UConverterFromUnicodeArgs* fromUArgs, const UChar* codeUnits, int32_t length,
UChar32 codePoint, UConverterCallbackReason reason, UErrorCode* err)
{
UChar outChar;
if (reason == UCNV_UNASSIGNED && (outChar = fallbackForGBK(codePoint))) {
const UChar* source = &outChar;
*err = U_ZERO_ERROR;
ucnv_cbFromUWriteUChars(fromUArgs, &source, source + 1, 0, err);
return;
}
UCNV_FROM_U_CALLBACK_SUBSTITUTE(context, fromUArgs, codeUnits, length, codePoint, reason, err);
}
class TextCodecInput {
public:
TextCodecInput(const TextEncoding& encoding, const UChar* characters, size_t length)
: m_begin(characters)
, m_end(characters + length)
{ }
TextCodecInput(const TextEncoding& encoding, const LChar* characters, size_t length)
{
m_buffer.reserveInitialCapacity(length);
for (size_t i = 0; i < length; ++i)
m_buffer.append(characters[i]);
m_begin = m_buffer.data();
m_end = m_begin + m_buffer.size();
}
const UChar* begin() const { return m_begin; }
const UChar* end() const { return m_end; }
private:
const UChar* m_begin;
const UChar* m_end;
Vector<UChar> m_buffer;
};
CString TextCodecICU::encodeInternal(const TextCodecInput& input, UnencodableHandling handling)
{
const UChar* source = input.begin();
const UChar* end = input.end();
UErrorCode err = U_ZERO_ERROR;
switch (handling) {
case QuestionMarksForUnencodables:
ucnv_setSubstChars(m_converterICU, "?", 1, &err);
ucnv_setFromUCallBack(m_converterICU, m_needsGBKFallbacks ? gbkCallbackSubstitute : UCNV_FROM_U_CALLBACK_SUBSTITUTE, 0, 0, 0, &err);
break;
case EntitiesForUnencodables:
ucnv_setFromUCallBack(m_converterICU, m_needsGBKFallbacks ? gbkCallbackEscape : UCNV_FROM_U_CALLBACK_ESCAPE, UCNV_ESCAPE_XML_DEC, 0, 0, &err);
break;
case URLEncodedEntitiesForUnencodables:
ucnv_setFromUCallBack(m_converterICU, m_needsGBKFallbacks ? gbkUrlEscapedEntityCallack : urlEscapedEntityCallback, 0, 0, 0, &err);
break;
}
ASSERT(U_SUCCESS(err));
if (U_FAILURE(err))
return CString();
Vector<char> result;
size_t size = 0;
do {
char buffer[ConversionBufferSize];
char* target = buffer;
char* targetLimit = target + ConversionBufferSize;
err = U_ZERO_ERROR;
ucnv_fromUnicode(m_converterICU, &target, targetLimit, &source, end, 0, true, &err);
size_t count = target - buffer;
result.grow(size + count);
memcpy(result.data() + size, buffer, count);
size += count;
} while (err == U_BUFFER_OVERFLOW_ERROR);
return CString(result.data(), size);
}
template<typename CharType>
CString TextCodecICU::encodeCommon(const CharType* characters, size_t length, UnencodableHandling handling)
{
if (!length)
return "";
if (!m_converterICU)
createICUConverter();
if (!m_converterICU)
return CString();
TextCodecInput input(m_encoding, characters, length);
return encodeInternal(input, handling);
}
CString TextCodecICU::encode(const UChar* characters, size_t length, UnencodableHandling handling)
{
return encodeCommon(characters, length, handling);
}
CString TextCodecICU::encode(const LChar* characters, size_t length, UnencodableHandling handling)
{
return encodeCommon(characters, length, handling);
}
} // namespace WTF
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