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Unified Diff: Source/core/loader/TextResourceDecoder.cpp

Issue 23623012: Move TextResourceDecoder from loader/ to fetch/ (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 7 years, 4 months ago
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Index: Source/core/loader/TextResourceDecoder.cpp
diff --git a/Source/core/loader/TextResourceDecoder.cpp b/Source/core/loader/TextResourceDecoder.cpp
deleted file mode 100644
index 139fcf1cb649d7b285eac564f5645b9772c84440..0000000000000000000000000000000000000000
--- a/Source/core/loader/TextResourceDecoder.cpp
+++ /dev/null
@@ -1,683 +0,0 @@
-/*
- Copyright (C) 1999 Lars Knoll (knoll@mpi-hd.mpg.de)
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
- Copyright (C) 2005, 2006, 2007 Alexey Proskuryakov (ap@nypop.com)
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public License
- along with this library; see the file COPYING.LIB. If not, write to
- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
-*/
-
-
-#include "config.h"
-#include "core/loader/TextResourceDecoder.h"
-
-#include "HTMLNames.h"
-#include "core/dom/DOMImplementation.h"
-#include "core/html/parser/HTMLMetaCharsetParser.h"
-#include "core/platform/text/TextEncodingDetector.h"
-#include "wtf/StringExtras.h"
-#include "wtf/text/TextCodec.h"
-#include "wtf/text/TextEncoding.h"
-#include "wtf/text/TextEncodingRegistry.h"
-
-using namespace WTF;
-
-namespace WebCore {
-
-using namespace HTMLNames;
-
-static inline bool bytesEqual(const char* p, char b0, char b1)
-{
- return p[0] == b0 && p[1] == b1;
-}
-
-static inline bool bytesEqual(const char* p, char b0, char b1, char b2)
-{
- return p[0] == b0 && p[1] == b1 && p[2] == b2;
-}
-
-static inline bool bytesEqual(const char* p, char b0, char b1, char b2, char b3, char b4)
-{
- return p[0] == b0 && p[1] == b1 && p[2] == b2 && p[3] == b3 && p[4] == b4;
-}
-
-static inline bool bytesEqual(const char* p, char b0, char b1, char b2, char b3, char b4, char b5)
-{
- return p[0] == b0 && p[1] == b1 && p[2] == b2 && p[3] == b3 && p[4] == b4 && p[5] == b5;
-}
-
-static inline bool bytesEqual(const char* p, char b0, char b1, char b2, char b3, char b4, char b5, char b6, char b7)
-{
- return p[0] == b0 && p[1] == b1 && p[2] == b2 && p[3] == b3 && p[4] == b4 && p[5] == b5 && p[6] == b6 && p[7] == b7;
-}
-
-static inline bool bytesEqual(const char* p, char b0, char b1, char b2, char b3, char b4, char b5, char b6, char b7, char b8, char b9)
-{
- return p[0] == b0 && p[1] == b1 && p[2] == b2 && p[3] == b3 && p[4] == b4 && p[5] == b5 && p[6] == b6 && p[7] == b7 && p[8] == b8 && p[9] == b9;
-}
-
-// You might think we should put these find functions elsewhere, perhaps with the
-// similar functions that operate on UChar, but arguably only the decoder has
-// a reason to process strings of char rather than UChar.
-
-static int find(const char* subject, size_t subjectLength, const char* target)
-{
- size_t targetLength = strlen(target);
- if (targetLength > subjectLength)
- return -1;
- for (size_t i = 0; i <= subjectLength - targetLength; ++i) {
- bool match = true;
- for (size_t j = 0; j < targetLength; ++j) {
- if (subject[i + j] != target[j]) {
- match = false;
- break;
- }
- }
- if (match)
- return i;
- }
- return -1;
-}
-
-static WTF::TextEncoding findTextEncoding(const char* encodingName, int length)
-{
- Vector<char, 64> buffer(length + 1);
- memcpy(buffer.data(), encodingName, length);
- buffer[length] = '\0';
- return buffer.data();
-}
-
-class KanjiCode {
-public:
- enum Type { ASCII, JIS, EUC, SJIS, UTF16, UTF8 };
- static enum Type judge(const char* str, int length);
- static const int ESC = 0x1b;
- static const unsigned char sjisMap[256];
- static int ISkanji(int code)
- {
- if (code >= 0x100)
- return 0;
- return sjisMap[code & 0xff] & 1;
- }
- static int ISkana(int code)
- {
- if (code >= 0x100)
- return 0;
- return sjisMap[code & 0xff] & 2;
- }
-};
-
-const unsigned char KanjiCode::sjisMap[256] = {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0
-};
-
-/*
- * EUC-JP is
- * [0xa1 - 0xfe][0xa1 - 0xfe]
- * 0x8e[0xa1 - 0xfe](SS2)
- * 0x8f[0xa1 - 0xfe][0xa1 - 0xfe](SS3)
- *
- * Shift_Jis is
- * [0x81 - 0x9f, 0xe0 - 0xef(0xfe?)][0x40 - 0x7e, 0x80 - 0xfc]
- *
- * Shift_Jis Hankaku Kana is
- * [0xa1 - 0xdf]
- */
-
-/*
- * KanjiCode::judge() is based on judge_jcode() from jvim
- * http://hp.vector.co.jp/authors/VA003457/vim/
- *
- * Special Thanks to Kenichi Tsuchida
- */
-
-enum KanjiCode::Type KanjiCode::judge(const char* str, int size)
-{
- enum Type code;
- int i;
- int bfr = false; /* Kana Moji */
- int bfk = 0; /* EUC Kana */
- int sjis = 0;
- int euc = 0;
-
- const unsigned char* ptr = reinterpret_cast<const unsigned char*>(str);
-
- code = ASCII;
-
- i = 0;
- while (i < size) {
- if (ptr[i] == ESC && (size - i >= 3)) {
- if (bytesEqual(str + i + 1, '$', 'B')
- || bytesEqual(str + i + 1, '(', 'B')
- || bytesEqual(str + i + 1, '$', '@')
- || bytesEqual(str + i + 1, '(', 'J')) {
- code = JIS;
- goto breakBreak;
- }
- if (bytesEqual(str + i + 1, '(', 'I') || bytesEqual(str + i + 1, ')', 'I')) {
- code = JIS;
- i += 3;
- } else {
- i++;
- }
- bfr = false;
- bfk = 0;
- } else {
- if (ptr[i] < 0x20) {
- bfr = false;
- bfk = 0;
- /* ?? check kudokuten ?? && ?? hiragana ?? */
- if ((i >= 2) && (ptr[i - 2] == 0x81)
- && (0x41 <= ptr[i - 1] && ptr[i - 1] <= 0x49)) {
- code = SJIS;
- sjis += 100; /* kudokuten */
- } else if ((i >= 2) && (ptr[i - 2] == 0xa1)
- && (0xa2 <= ptr[i - 1] && ptr[i - 1] <= 0xaa)) {
- code = EUC;
- euc += 100; /* kudokuten */
- } else if ((i >= 2) && (ptr[i - 2] == 0x82) && (0xa0 <= ptr[i - 1])) {
- sjis += 40; /* hiragana */
- } else if ((i >= 2) && (ptr[i - 2] == 0xa4) && (0xa0 <= ptr[i - 1])) {
- euc += 40; /* hiragana */
- }
- } else {
- /* ?? check hiragana or katana ?? */
- if ((size - i > 1) && (ptr[i] == 0x82) && (0xa0 <= ptr[i + 1])) {
- sjis++; /* hiragana */
- } else if ((size - i > 1) && (ptr[i] == 0x83)
- && (0x40 <= ptr[i + 1] && ptr[i + 1] <= 0x9f)) {
- sjis++; /* katakana */
- } else if ((size - i > 1) && (ptr[i] == 0xa4) && (0xa0 <= ptr[i + 1])) {
- euc++; /* hiragana */
- } else if ((size - i > 1) && (ptr[i] == 0xa5) && (0xa0 <= ptr[i + 1])) {
- euc++; /* katakana */
- }
- if (bfr) {
- if ((i >= 1) && (0x40 <= ptr[i] && ptr[i] <= 0xa0) && ISkanji(ptr[i - 1])) {
- code = SJIS;
- goto breakBreak;
- } else if ((i >= 1) && (0x81 <= ptr[i - 1] && ptr[i - 1] <= 0x9f) && ((0x40 <= ptr[i] && ptr[i] < 0x7e) || (0x7e < ptr[i] && ptr[i] <= 0xfc))) {
- code = SJIS;
- goto breakBreak;
- } else if ((i >= 1) && (0xfd <= ptr[i] && ptr[i] <= 0xfe) && (0xa1 <= ptr[i - 1] && ptr[i - 1] <= 0xfe)) {
- code = EUC;
- goto breakBreak;
- } else if ((i >= 1) && (0xfd <= ptr[i - 1] && ptr[i - 1] <= 0xfe) && (0xa1 <= ptr[i] && ptr[i] <= 0xfe)) {
- code = EUC;
- goto breakBreak;
- } else if ((i >= 1) && (ptr[i] < 0xa0 || 0xdf < ptr[i]) && (0x8e == ptr[i - 1])) {
- code = SJIS;
- goto breakBreak;
- } else if (ptr[i] <= 0x7f) {
- code = SJIS;
- goto breakBreak;
- } else {
- if (0xa1 <= ptr[i] && ptr[i] <= 0xa6) {
- euc++; /* sjis hankaku kana kigo */
- } else if (0xa1 <= ptr[i] && ptr[i] <= 0xdf) {
- ; /* sjis hankaku kana */
- } else if (0xa1 <= ptr[i] && ptr[i] <= 0xfe) {
- euc++;
- } else if (0x8e == ptr[i]) {
- euc++;
- } else if (0x20 <= ptr[i] && ptr[i] <= 0x7f) {
- sjis++;
- }
- bfr = false;
- bfk = 0;
- }
- } else if (0x8e == ptr[i]) {
- if (size - i <= 1) {
- ;
- } else if (0xa1 <= ptr[i + 1] && ptr[i + 1] <= 0xdf) {
- /* EUC KANA or SJIS KANJI */
- if (bfk == 1) {
- euc += 100;
- }
- bfk++;
- i++;
- } else {
- /* SJIS only */
- code = SJIS;
- goto breakBreak;
- }
- } else if (0x81 <= ptr[i] && ptr[i] <= 0x9f) {
- /* SJIS only */
- code = SJIS;
- if ((size - i >= 1)
- && ((0x40 <= ptr[i + 1] && ptr[i + 1] <= 0x7e)
- || (0x80 <= ptr[i + 1] && ptr[i + 1] <= 0xfc))) {
- goto breakBreak;
- }
- } else if (0xfd <= ptr[i] && ptr[i] <= 0xfe) {
- /* EUC only */
- code = EUC;
- if ((size - i >= 1)
- && (0xa1 <= ptr[i + 1] && ptr[i + 1] <= 0xfe)) {
- goto breakBreak;
- }
- } else if (ptr[i] <= 0x7f) {
- ;
- } else {
- bfr = true;
- bfk = 0;
- }
- }
- i++;
- }
- }
- if (code == ASCII) {
- if (sjis > euc) {
- code = SJIS;
- } else if (sjis < euc) {
- code = EUC;
- }
- }
-breakBreak:
- return (code);
-}
-
-TextResourceDecoder::ContentType TextResourceDecoder::determineContentType(const String& mimeType)
-{
- if (equalIgnoringCase(mimeType, "text/css"))
- return CSS;
- if (equalIgnoringCase(mimeType, "text/html"))
- return HTML;
- if (DOMImplementation::isXMLMIMEType(mimeType))
- return XML;
- return PlainText;
-}
-
-const WTF::TextEncoding& TextResourceDecoder::defaultEncoding(ContentType contentType, const WTF::TextEncoding& specifiedDefaultEncoding)
-{
- // Despite 8.5 "Text/xml with Omitted Charset" of RFC 3023, we assume UTF-8 instead of US-ASCII
- // for text/xml. This matches Firefox.
- if (contentType == XML)
- return UTF8Encoding();
- if (!specifiedDefaultEncoding.isValid())
- return Latin1Encoding();
- return specifiedDefaultEncoding;
-}
-
-TextResourceDecoder::TextResourceDecoder(const String& mimeType, const WTF::TextEncoding& specifiedDefaultEncoding, bool usesEncodingDetector)
- : m_contentType(determineContentType(mimeType))
- , m_encoding(defaultEncoding(m_contentType, specifiedDefaultEncoding))
- , m_source(DefaultEncoding)
- , m_hintEncoding(0)
- , m_checkedForBOM(false)
- , m_checkedForCSSCharset(false)
- , m_checkedForXMLCharset(false)
- , m_checkedForMetaCharset(false)
- , m_useLenientXMLDecoding(false)
- , m_sawError(false)
- , m_usesEncodingDetector(usesEncodingDetector)
-{
-}
-
-TextResourceDecoder::~TextResourceDecoder()
-{
-}
-
-void TextResourceDecoder::setEncoding(const WTF::TextEncoding& encoding, EncodingSource source)
-{
- // In case the encoding didn't exist, we keep the old one (helps some sites specifying invalid encodings).
- if (!encoding.isValid())
- return;
-
- // When encoding comes from meta tag (i.e. it cannot be XML files sent via XHR),
- // treat x-user-defined as windows-1252 (bug 18270)
- if (source == EncodingFromMetaTag && strcasecmp(encoding.name(), "x-user-defined") == 0)
- m_encoding = "windows-1252";
- else if (source == EncodingFromMetaTag || source == EncodingFromXMLHeader || source == EncodingFromCSSCharset)
- m_encoding = encoding.closestByteBasedEquivalent();
- else
- m_encoding = encoding;
-
- m_codec.clear();
- m_source = source;
-}
-
-// Returns the position of the encoding string.
-static int findXMLEncoding(const char* str, int len, int& encodingLength)
-{
- int pos = find(str, len, "encoding");
- if (pos == -1)
- return -1;
- pos += 8;
-
- // Skip spaces and stray control characters.
- while (pos < len && str[pos] <= ' ')
- ++pos;
-
- // Skip equals sign.
- if (pos >= len || str[pos] != '=')
- return -1;
- ++pos;
-
- // Skip spaces and stray control characters.
- while (pos < len && str[pos] <= ' ')
- ++pos;
-
- // Skip quotation mark.
- if (pos >= len)
- return - 1;
- char quoteMark = str[pos];
- if (quoteMark != '"' && quoteMark != '\'')
- return -1;
- ++pos;
-
- // Find the trailing quotation mark.
- int end = pos;
- while (end < len && str[end] != quoteMark)
- ++end;
- if (end >= len)
- return -1;
-
- encodingLength = end - pos;
- return pos;
-}
-
-// true if there is more to parse
-static inline bool skipWhitespace(const char*& pos, const char* dataEnd)
-{
- while (pos < dataEnd && (*pos == '\t' || *pos == ' '))
- ++pos;
- return pos != dataEnd;
-}
-
-size_t TextResourceDecoder::checkForBOM(const char* data, size_t len)
-{
- // Check for UTF-16/32 or UTF-8 BOM mark at the beginning, which is a sure sign of a Unicode encoding.
- // We let it override even a user-chosen encoding.
- ASSERT(!m_checkedForBOM);
-
- size_t lengthOfBOM = 0;
-
- size_t bufferLength = m_buffer.size();
-
- size_t buf1Len = bufferLength;
- size_t buf2Len = len;
- const unsigned char* buf1 = reinterpret_cast<const unsigned char*>(m_buffer.data());
- const unsigned char* buf2 = reinterpret_cast<const unsigned char*>(data);
- unsigned char c1 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
- unsigned char c2 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
- unsigned char c3 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
- unsigned char c4 = buf2Len ? (--buf2Len, *buf2++) : 0;
-
- // Check for the BOM.
- if (c1 == 0xFF && c2 == 0xFE) {
- if (c3 != 0 || c4 != 0) {
- setEncoding(UTF16LittleEndianEncoding(), AutoDetectedEncoding);
- lengthOfBOM = 2;
- } else {
- setEncoding(UTF32LittleEndianEncoding(), AutoDetectedEncoding);
- lengthOfBOM = 4;
- }
- } else if (c1 == 0xEF && c2 == 0xBB && c3 == 0xBF) {
- setEncoding(UTF8Encoding(), AutoDetectedEncoding);
- lengthOfBOM = 3;
- } else if (c1 == 0xFE && c2 == 0xFF) {
- setEncoding(UTF16BigEndianEncoding(), AutoDetectedEncoding);
- lengthOfBOM = 2;
- } else if (c1 == 0 && c2 == 0 && c3 == 0xFE && c4 == 0xFF) {
- setEncoding(UTF32BigEndianEncoding(), AutoDetectedEncoding);
- lengthOfBOM = 4;
- }
-
- if (lengthOfBOM || bufferLength + len >= 4)
- m_checkedForBOM = true;
-
- return lengthOfBOM;
-}
-
-bool TextResourceDecoder::checkForCSSCharset(const char* data, size_t len, bool& movedDataToBuffer)
-{
- if (m_source != DefaultEncoding && m_source != EncodingFromParentFrame) {
- m_checkedForCSSCharset = true;
- return true;
- }
-
- size_t oldSize = m_buffer.size();
- m_buffer.grow(oldSize + len);
- memcpy(m_buffer.data() + oldSize, data, len);
-
- movedDataToBuffer = true;
-
- if (m_buffer.size() <= 13) // strlen('@charset "x";') == 13
- return false;
-
- const char* dataStart = m_buffer.data();
- const char* dataEnd = dataStart + m_buffer.size();
-
- if (bytesEqual(dataStart, '@', 'c', 'h', 'a', 'r', 's', 'e', 't', ' ', '"')) {
- dataStart += 10;
- const char* pos = dataStart;
-
- while (pos < dataEnd && *pos != '"')
- ++pos;
- if (pos == dataEnd)
- return false;
-
- int encodingNameLength = pos - dataStart;
-
- ++pos;
-
- if (*pos == ';')
- setEncoding(findTextEncoding(dataStart, encodingNameLength), EncodingFromCSSCharset);
- }
-
- m_checkedForCSSCharset = true;
- return true;
-}
-
-bool TextResourceDecoder::checkForXMLCharset(const char* data, size_t len, bool& movedDataToBuffer)
-{
- if (m_source != DefaultEncoding && m_source != EncodingFromParentFrame) {
- m_checkedForXMLCharset = true;
- return true;
- }
-
- // This is not completely efficient, since the function might go
- // through the HTML head several times.
-
- size_t oldSize = m_buffer.size();
- m_buffer.grow(oldSize + len);
- memcpy(m_buffer.data() + oldSize, data, len);
-
- movedDataToBuffer = true;
-
- const char* ptr = m_buffer.data();
- const char* pEnd = ptr + m_buffer.size();
-
- // Is there enough data available to check for XML declaration?
- if (m_buffer.size() < 8)
- return false;
-
- // Handle XML declaration, which can have encoding in it. This encoding is honored even for HTML documents.
- // It is an error for an XML declaration not to be at the start of an XML document, and it is ignored in HTML documents in such case.
- if (bytesEqual(ptr, '<', '?', 'x', 'm', 'l')) {
- const char* xmlDeclarationEnd = ptr;
- while (xmlDeclarationEnd != pEnd && *xmlDeclarationEnd != '>')
- ++xmlDeclarationEnd;
- if (xmlDeclarationEnd == pEnd)
- return false;
- // No need for +1, because we have an extra "?" to lose at the end of XML declaration.
- int len = 0;
- int pos = findXMLEncoding(ptr, xmlDeclarationEnd - ptr, len);
- if (pos != -1)
- setEncoding(findTextEncoding(ptr + pos, len), EncodingFromXMLHeader);
- // continue looking for a charset - it may be specified in an HTTP-Equiv meta
- } else if (bytesEqual(ptr, '<', 0, '?', 0, 'x', 0))
- setEncoding(UTF16LittleEndianEncoding(), AutoDetectedEncoding);
- else if (bytesEqual(ptr, 0, '<', 0, '?', 0, 'x'))
- setEncoding(UTF16BigEndianEncoding(), AutoDetectedEncoding);
- else if (bytesEqual(ptr, '<', 0, 0, 0, '?', 0, 0, 0))
- setEncoding(UTF32LittleEndianEncoding(), AutoDetectedEncoding);
- else if (bytesEqual(ptr, 0, 0, 0, '<', 0, 0, 0, '?'))
- setEncoding(UTF32BigEndianEncoding(), AutoDetectedEncoding);
-
- m_checkedForXMLCharset = true;
- return true;
-}
-
-void TextResourceDecoder::checkForMetaCharset(const char* data, size_t length)
-{
- if (m_source == UserChosenEncoding || m_source == EncodingFromHTTPHeader || m_source == AutoDetectedEncoding) {
- m_checkedForMetaCharset = true;
- return;
- }
-
- if (!m_charsetParser)
- m_charsetParser = HTMLMetaCharsetParser::create();
-
- if (!m_charsetParser->checkForMetaCharset(data, length))
- return;
-
- setEncoding(m_charsetParser->encoding(), EncodingFromMetaTag);
- m_charsetParser.clear();
- m_checkedForMetaCharset = true;
- return;
-}
-
-void TextResourceDecoder::detectJapaneseEncoding(const char* data, size_t len)
-{
- switch (KanjiCode::judge(data, len)) {
- case KanjiCode::JIS:
- setEncoding("ISO-2022-JP", EncodingFromContentSniffing);
- break;
- case KanjiCode::EUC:
- setEncoding("EUC-JP", EncodingFromContentSniffing);
- break;
- case KanjiCode::SJIS:
- setEncoding("Shift_JIS", EncodingFromContentSniffing);
- break;
- case KanjiCode::ASCII:
- case KanjiCode::UTF16:
- case KanjiCode::UTF8:
- break;
- }
-}
-
-// We use the encoding detector in two cases:
-// 1. Encoding detector is turned ON and no other encoding source is
-// available (that is, it's DefaultEncoding).
-// 2. Encoding detector is turned ON and the encoding is set to
-// the encoding of the parent frame, which is also auto-detected.
-// Note that condition #2 is NOT satisfied unless parent-child frame
-// relationship is compliant to the same-origin policy. If they're from
-// different domains, |m_source| would not be set to EncodingFromParentFrame
-// in the first place.
-bool TextResourceDecoder::shouldAutoDetect() const
-{
- // Just checking m_hintEncoding suffices here because it's only set
- // in setHintEncoding when the source is AutoDetectedEncoding.
- return m_usesEncodingDetector
- && (m_source == DefaultEncoding || (m_source == EncodingFromParentFrame && m_hintEncoding));
-}
-
-String TextResourceDecoder::decode(const char* data, size_t len)
-{
- size_t lengthOfBOM = 0;
- if (!m_checkedForBOM)
- lengthOfBOM = checkForBOM(data, len);
-
- bool movedDataToBuffer = false;
-
- if (m_contentType == CSS && !m_checkedForCSSCharset)
- if (!checkForCSSCharset(data, len, movedDataToBuffer))
- return emptyString();
-
- if ((m_contentType == HTML || m_contentType == XML) && !m_checkedForXMLCharset)
- if (!checkForXMLCharset(data, len, movedDataToBuffer))
- return emptyString();
-
- // FIXME: It would be more efficient to move this logic below checkForMetaCharset because
- // checkForMetaCharset can overrule these detections.
- if (shouldAutoDetect()) {
- if (m_encoding.isJapanese())
- detectJapaneseEncoding(data, len); // FIXME: We should use detectTextEncoding() for all languages.
- else {
- WTF::TextEncoding detectedEncoding;
- if (detectTextEncoding(data, len, m_hintEncoding, &detectedEncoding))
- setEncoding(detectedEncoding, EncodingFromContentSniffing);
- }
- }
-
- ASSERT(m_encoding.isValid());
-
- const char* dataForDecode = data + lengthOfBOM;
- size_t lengthForDecode = len - lengthOfBOM;
-
- if (!m_buffer.isEmpty()) {
- if (!movedDataToBuffer) {
- size_t oldSize = m_buffer.size();
- m_buffer.grow(oldSize + len);
- memcpy(m_buffer.data() + oldSize, data, len);
- }
-
- dataForDecode = m_buffer.data() + lengthOfBOM;
- lengthForDecode = m_buffer.size() - lengthOfBOM;
- }
-
- if (m_contentType == HTML && !m_checkedForMetaCharset)
- checkForMetaCharset(dataForDecode, lengthForDecode);
-
- if (!m_codec)
- m_codec = newTextCodec(m_encoding);
-
- String result = m_codec->decode(dataForDecode, lengthForDecode, false, m_contentType == XML && !m_useLenientXMLDecoding, m_sawError);
-
- m_buffer.clear();
- return result;
-}
-
-String TextResourceDecoder::flush()
-{
- // If we can not identify the encoding even after a document is completely
- // loaded, we need to detect the encoding if other conditions for
- // autodetection is satisfied.
- if (m_buffer.size() && shouldAutoDetect()
- && ((!m_checkedForXMLCharset && (m_contentType == HTML || m_contentType == XML)) || (!m_checkedForCSSCharset && (m_contentType == CSS)))) {
- WTF::TextEncoding detectedEncoding;
- if (detectTextEncoding(m_buffer.data(), m_buffer.size(), m_hintEncoding, &detectedEncoding))
- setEncoding(detectedEncoding, EncodingFromContentSniffing);
- }
-
- if (!m_codec)
- m_codec = newTextCodec(m_encoding);
-
- String result = m_codec->decode(m_buffer.data(), m_buffer.size(), true, m_contentType == XML && !m_useLenientXMLDecoding, m_sawError);
- m_buffer.clear();
- m_codec.clear();
- m_checkedForBOM = false; // Skip BOM again when re-decoding.
- return result;
-}
-
-}
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