| /* |
| * Copyright (C) 2010 Google Inc. All Rights Reserved. |
| * |
| * 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 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 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 "core/html/parser/HTMLMetaCharsetParser.h" |
| |
| #include "core/HTMLNames.h" |
| #include "core/html/parser/HTMLParserIdioms.h" |
| #include "core/html/parser/HTMLParserOptions.h" |
| #include "core/html/parser/HTMLTokenizer.h" |
| #include "wtf/text/TextEncodingRegistry.h" |
| #include "wtf/text/WTFString.h" |
| |
| using namespace WTF; |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| HTMLMetaCharsetParser::HTMLMetaCharsetParser() |
| : m_tokenizer(HTMLTokenizer::create(HTMLParserOptions(0))), |
| m_assumedCodec(newTextCodec(Latin1Encoding())), |
| m_inHeadSection(true), |
| m_doneChecking(false) {} |
| |
| HTMLMetaCharsetParser::~HTMLMetaCharsetParser() {} |
| |
| bool HTMLMetaCharsetParser::processMeta() { |
| const HTMLToken::AttributeList& tokenAttributes = m_token.attributes(); |
| HTMLAttributeList attributes; |
| for (const HTMLToken::Attribute& tokenAttribute : tokenAttributes) { |
| String attributeName = tokenAttribute.nameAttemptStaticStringCreation(); |
| String attributeValue = tokenAttribute.value8BitIfNecessary(); |
| attributes.append(std::make_pair(attributeName, attributeValue)); |
| } |
| |
| m_encoding = encodingFromMetaAttributes(attributes); |
| return m_encoding.isValid(); |
| } |
| |
| // That many input bytes will be checked for meta charset even if <head> section |
| // is over. |
| static const int bytesToCheckUnconditionally = 1024; |
| |
| bool HTMLMetaCharsetParser::checkForMetaCharset(const char* data, |
| size_t length) { |
| if (m_doneChecking) |
| return true; |
| |
| ASSERT(!m_encoding.isValid()); |
| |
| // We still don't have an encoding, and are in the head. The following tags |
| // are allowed in <head>: SCRIPT|STYLE|META|LINK|OBJECT|TITLE|BASE |
| |
| // We stop scanning when a tag that is not permitted in <head> is seen, rather |
| // when </head> is seen, because that more closely matches behavior in other |
| // browsers; more details in <http://bugs.webkit.org/show_bug.cgi?id=3590>. |
| |
| // Additionally, we ignore things that looks like tags in <title>, <script> |
| // and <noscript>; see: |
| // <http://bugs.webkit.org/show_bug.cgi?id=4560> |
| // <http://bugs.webkit.org/show_bug.cgi?id=12165> |
| // <http://bugs.webkit.org/show_bug.cgi?id=12389> |
| |
| // Since many sites have charset declarations after <body> or other tags that |
| // are disallowed in <head>, we don't bail out until we've checked at least |
| // bytesToCheckUnconditionally bytes of input. |
| |
| m_input.append(SegmentedString(m_assumedCodec->decode(data, length))); |
| |
| while (m_tokenizer->nextToken(m_input, m_token)) { |
| bool end = m_token.type() == HTMLToken::EndTag; |
| if (end || m_token.type() == HTMLToken::StartTag) { |
| String tagName = attemptStaticStringCreation(m_token.name(), Likely8Bit); |
| if (!end) { |
| m_tokenizer->updateStateFor(tagName); |
| if (threadSafeMatch(tagName, metaTag) && processMeta()) { |
| m_doneChecking = true; |
| return true; |
| } |
| } |
| |
| if (!threadSafeMatch(tagName, scriptTag) && |
| !threadSafeMatch(tagName, noscriptTag) && |
| !threadSafeMatch(tagName, styleTag) && |
| !threadSafeMatch(tagName, linkTag) && |
| !threadSafeMatch(tagName, metaTag) && |
| !threadSafeMatch(tagName, objectTag) && |
| !threadSafeMatch(tagName, titleTag) && |
| !threadSafeMatch(tagName, baseTag) && |
| (end || !threadSafeMatch(tagName, htmlTag)) && |
| (end || !threadSafeMatch(tagName, headTag))) { |
| m_inHeadSection = false; |
| } |
| } |
| |
| if (!m_inHeadSection && |
| m_input.numberOfCharactersConsumed() >= bytesToCheckUnconditionally) { |
| m_doneChecking = true; |
| return true; |
| } |
| |
| m_token.clear(); |
| } |
| |
| return false; |
| } |
| |
| } // namespace blink |
