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      1 /*
      2  * Copyright (C) 2010 Google Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef HTMLMetaCharsetParser_h
     27 #define HTMLMetaCharsetParser_h
     28 
     29 #include "HTMLToken.h"
     30 #include "SegmentedString.h"
     31 #include "TextEncoding.h"
     32 #include <wtf/Noncopyable.h>
     33 
     34 namespace WebCore {
     35 
     36 class HTMLTokenizer;
     37 class TextCodec;
     38 
     39 class HTMLMetaCharsetParser {
     40     WTF_MAKE_NONCOPYABLE(HTMLMetaCharsetParser);
     41 public:
     42     static PassOwnPtr<HTMLMetaCharsetParser> create() { return adoptPtr(new HTMLMetaCharsetParser()); }
     43 
     44     ~HTMLMetaCharsetParser();
     45 
     46     // Returns true if done checking, regardless whether an encoding is found.
     47     bool checkForMetaCharset(const char*, size_t);
     48 
     49     const TextEncoding& encoding() { return m_encoding; }
     50 
     51 private:
     52     HTMLMetaCharsetParser();
     53 
     54     bool processMeta();
     55     String extractCharset(const String&);
     56 
     57     enum Mode {
     58         None,
     59         Charset,
     60         Pragma,
     61     };
     62 
     63     OwnPtr<HTMLTokenizer> m_tokenizer;
     64     OwnPtr<TextCodec> m_assumedCodec;
     65     SegmentedString m_input;
     66     HTMLToken m_token;
     67     bool m_inHeadSection;
     68 
     69     bool m_doneChecking;
     70     TextEncoding m_encoding;
     71 };
     72 
     73 }
     74 #endif
     75