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 TextResourceDecoder : public RefCounted<TextResourceDecoder> { 31 public: 32 enum EncodingSource { 33 DefaultEncoding, 34 AutoDetectedEncoding, 35 EncodingFromXMLHeader, 36 EncodingFromMetaTag, 37 EncodingFromCSSCharset, 38 EncodingFromHTTPHeader, 39 UserChosenEncoding, 40 EncodingFromParentFrame 41 }; 42 43 static PassRefPtr<TextResourceDecoder> create(const String& mimeType, const TextEncoding& defaultEncoding = TextEncoding(), bool usesEncodingDetector = false) 44 { 45 return adoptRef(new TextResourceDecoder(mimeType, defaultEncoding, usesEncodingDetector)); 46 } 47 ~TextResourceDecoder(); 48 49 void setEncoding(const TextEncoding&, EncodingSource); encoding()50 const TextEncoding& encoding() const { return m_encoding; } 51 52 String decode(const char* data, size_t length); 53 String flush(); 54 setHintEncoding(const TextResourceDecoder * hintDecoder)55 void setHintEncoding(const TextResourceDecoder* hintDecoder) 56 { 57 // hintEncoding is for use with autodetection, which should be 58 // only invoked when hintEncoding comes from auto-detection. 59 if (hintDecoder && hintDecoder->m_source == AutoDetectedEncoding) 60 m_hintEncoding = hintDecoder->encoding().name(); 61 } 62 useLenientXMLDecoding()63 void useLenientXMLDecoding() { m_useLenientXMLDecoding = true; } sawError()64 bool sawError() const { return m_sawError; } 65 66 private: 67 TextResourceDecoder(const String& mimeType, const TextEncoding& defaultEncoding, 68 bool usesEncodingDetector); 69 70 enum ContentType { PlainText, HTML, XML, CSS }; // PlainText only checks for BOM. 71 static ContentType determineContentType(const String& mimeType); 72 static const TextEncoding& defaultEncoding(ContentType, const TextEncoding& defaultEncoding); 73 74 size_t checkForBOM(const char*, size_t); 75 bool checkForCSSCharset(const char*, size_t, bool& movedDataToBuffer); 76 bool checkForHeadCharset(const char*, size_t, bool& movedDataToBuffer); 77 void detectJapaneseEncoding(const char*, size_t); 78 bool shouldAutoDetect() const; 79 80 ContentType m_contentType; 81 TextEncoding m_encoding; 82 OwnPtr<TextCodec> m_codec; 83 EncodingSource m_source; 84 const char* m_hintEncoding; 85 Vector<char> m_buffer; 86 bool m_checkedForBOM; 87 bool m_checkedForCSSCharset; 88 bool m_checkedForHeadCharset; 89 bool m_useLenientXMLDecoding; // Don't stop on XML decoding errors. 90 bool m_sawError; 91 bool m_usesEncodingDetector; 92 }; 93 94 } 95 96 #endif 97