1 /* 2 Copyright (C) 1999 Lars Knoll (knoll@mpi-hd.mpg.de) 3 Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com) 4 Copyright (C) 2006, 2008 Apple Inc. All rights reserved. 5 6 This library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Library General Public 8 License as published by the Free Software Foundation; either 9 version 2 of the License, or (at your option) any later version. 10 11 This library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Library General Public License for more details. 15 16 You should have received a copy of the GNU Library General Public License 17 along with this library; see the file COPYING.LIB. If not, write to 18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 Boston, MA 02110-1301, USA. 20 21 */ 22 23 #ifndef TextResourceDecoder_h 24 #define TextResourceDecoder_h 25 26 #include "TextEncoding.h" 27 28 namespace WebCore { 29 30 class HTMLMetaCharsetParser; 31 32 class TextResourceDecoder : public RefCounted<TextResourceDecoder> { 33 public: 34 enum EncodingSource { 35 DefaultEncoding, 36 AutoDetectedEncoding, 37 EncodingFromXMLHeader, 38 EncodingFromMetaTag, 39 EncodingFromCSSCharset, 40 EncodingFromHTTPHeader, 41 UserChosenEncoding, 42 EncodingFromParentFrame 43 }; 44 45 static PassRefPtr<TextResourceDecoder> create(const String& mimeType, const TextEncoding& defaultEncoding = TextEncoding(), bool usesEncodingDetector = false) 46 { 47 return adoptRef(new TextResourceDecoder(mimeType, defaultEncoding, usesEncodingDetector)); 48 } 49 ~TextResourceDecoder(); 50 51 void setEncoding(const TextEncoding&, EncodingSource); encoding()52 const TextEncoding& encoding() const { return m_encoding; } 53 54 String decode(const char* data, size_t length); 55 String flush(); 56 setHintEncoding(const TextResourceDecoder * hintDecoder)57 void setHintEncoding(const TextResourceDecoder* hintDecoder) 58 { 59 // hintEncoding is for use with autodetection, which should be 60 // only invoked when hintEncoding comes from auto-detection. 61 if (hintDecoder && hintDecoder->m_source == AutoDetectedEncoding) 62 m_hintEncoding = hintDecoder->encoding().name(); 63 } 64 useLenientXMLDecoding()65 void useLenientXMLDecoding() { m_useLenientXMLDecoding = true; } sawError()66 bool sawError() const { return m_sawError; } 67 68 private: 69 TextResourceDecoder(const String& mimeType, const TextEncoding& defaultEncoding, 70 bool usesEncodingDetector); 71 72 enum ContentType { PlainText, HTML, XML, CSS }; // PlainText only checks for BOM. 73 static ContentType determineContentType(const String& mimeType); 74 static const TextEncoding& defaultEncoding(ContentType, const TextEncoding& defaultEncoding); 75 76 size_t checkForBOM(const char*, size_t); 77 bool checkForCSSCharset(const char*, size_t, bool& movedDataToBuffer); 78 bool checkForHeadCharset(const char*, size_t, bool& movedDataToBuffer); 79 bool checkForMetaCharset(const char*, size_t); 80 void detectJapaneseEncoding(const char*, size_t); 81 bool shouldAutoDetect() const; 82 83 ContentType m_contentType; 84 TextEncoding m_encoding; 85 OwnPtr<TextCodec> m_codec; 86 EncodingSource m_source; 87 const char* m_hintEncoding; 88 Vector<char> m_buffer; 89 bool m_checkedForBOM; 90 bool m_checkedForCSSCharset; 91 bool m_checkedForHeadCharset; 92 bool m_useLenientXMLDecoding; // Don't stop on XML decoding errors. 93 bool m_sawError; 94 bool m_usesEncodingDetector; 95 96 OwnPtr<HTMLMetaCharsetParser> m_charsetParser; 97 }; 98 99 } 100 101 #endif 102