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      1 /*
      2     Copyright (C) 1999 Lars Knoll (knoll (at) mpi-hd.mpg.de)
      3     Copyright (C) 2006 Alexey Proskuryakov (ap (at) 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);
     50     const TextEncoding& encoding() const { return m_encoding; }
     51 
     52     String decode(const char* data, size_t length);
     53     String flush();
     54 
     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 
     63     void useLenientXMLDecoding() { m_useLenientXMLDecoding = true; }
     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