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/*
Copyright (C) 1999 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
Copyright (C) 2006-2017 Apple Inc. All rights reserved.
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.
*/
#pragma once
#include <pal/text/TextEncoding.h>
#include <wtf/RefCounted.h>
namespace PAL {
class TextCodec;
}
namespace WebCore {
class HTMLMetaCharsetParser;
class TextResourceDecoder : public RefCounted<TextResourceDecoder> {
public:
enum EncodingSource {
DefaultEncoding,
AutoDetectedEncoding,
EncodingFromXMLHeader,
EncodingFromMetaTag,
EncodingFromCSSCharset,
EncodingFromHTTPHeader,
UserChosenEncoding,
EncodingFromParentFrame
};
WEBCORE_EXPORT static Ref<TextResourceDecoder> create(const String& mimeType, const PAL::TextEncoding& defaultEncoding = { }, bool usesEncodingDetector = false);
WEBCORE_EXPORT ~TextResourceDecoder();
static String textFromUTF8(const unsigned char* data, unsigned length);
void setEncoding(const PAL::TextEncoding&, EncodingSource);
const PAL::TextEncoding& encoding() const { return m_encoding; }
const PAL::TextEncoding* encodingForURLParsing();
bool hasEqualEncodingForCharset(const String& charset) const;
WEBCORE_EXPORT String decode(const char* data, size_t length);
String decode(const uint8_t* data, size_t length) { return decode(reinterpret_cast<const char*>(data), length); }
WEBCORE_EXPORT String flush();
WEBCORE_EXPORT String decodeAndFlush(const char* data, size_t length);
String decodeAndFlush(const uint8_t* data, size_t length) { return decodeAndFlush(reinterpret_cast<const char*>(data), length); }
void setHintEncoding(const TextResourceDecoder* parentFrameDecoder);
void useLenientXMLDecoding() { m_useLenientXMLDecoding = true; }
bool sawError() const { return m_sawError; }
void setAlwaysUseUTF8() { ASSERT(!strcmp(m_encoding.name(), "UTF-8")); m_alwaysUseUTF8 = true; }
private:
TextResourceDecoder(const String& mimeType, const PAL::TextEncoding& defaultEncoding, bool usesEncodingDetector);
enum ContentType { PlainText, HTML, XML, CSS }; // PlainText only checks for BOM.
static ContentType determineContentType(const String& mimeType);
static const PAL::TextEncoding& defaultEncoding(ContentType, const PAL::TextEncoding& defaultEncoding);
size_t checkForBOM(const char*, size_t);
bool checkForCSSCharset(const char*, size_t, bool& movedDataToBuffer);
bool checkForHeadCharset(const char*, size_t, bool& movedDataToBuffer);
bool checkForMetaCharset(const char*, size_t);
void detectJapaneseEncoding(const char*, size_t);
bool shouldAutoDetect() const;
ContentType m_contentType;
PAL::TextEncoding m_encoding;
std::unique_ptr<PAL::TextCodec> m_codec;
std::unique_ptr<HTMLMetaCharsetParser> m_charsetParser;
EncodingSource m_source { DefaultEncoding };
const char* m_parentFrameAutoDetectedEncoding { nullptr };
Vector<char> m_buffer;
bool m_checkedForBOM { false };
bool m_checkedForCSSCharset { false };
bool m_checkedForHeadCharset { false };
bool m_useLenientXMLDecoding { false }; // Don't stop on XML decoding errors.
bool m_sawError { false };
bool m_usesEncodingDetector { false };
bool m_alwaysUseUTF8 { false };
};
inline void TextResourceDecoder::setHintEncoding(const TextResourceDecoder* parentFrameDecoder)
{
if (parentFrameDecoder && parentFrameDecoder->m_source == AutoDetectedEncoding)
m_parentFrameAutoDetectedEncoding = parentFrameDecoder->encoding().name();
}
} // namespace WebCore
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