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      1 /*
      2  * Copyright (C) 2012 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WebSocketExtensionParser_h
     32 #define WebSocketExtensionParser_h
     33 
     34 #include "wtf/HashMap.h"
     35 #include "wtf/text/StringHash.h"
     36 #include "wtf/text/WTFString.h"
     37 
     38 namespace blink {
     39 
     40 class WebSocketExtensionParser {
     41 public:
     42     WebSocketExtensionParser(const char* start, const char* end)
     43         : m_current(start)
     44         , m_end(end)
     45     {
     46     }
     47     bool finished();
     48     bool parsedSuccessfully();
     49     bool parseExtension(String& extensionToken, HashMap<String, String>& parameters);
     50 
     51 private:
     52     class ParserStateBackup {
     53     public:
     54         ParserStateBackup(WebSocketExtensionParser* parser)
     55             : m_parser(parser)
     56             , m_current(parser->m_current)
     57             , m_isDisposed(false) { }
     58         ~ParserStateBackup();
     59 
     60         void dispose() { m_isDisposed = true; }
     61     private:
     62         WebSocketExtensionParser* m_parser;
     63         const char* m_current;
     64         bool m_isDisposed;
     65     };
     66     const String& currentToken() { return m_currentToken; }
     67 
     68     // The following member functions basically follow the grammar defined
     69     // in Section 2.2 of RFC 2616.
     70     bool consumeToken();
     71     bool consumeQuotedString();
     72     bool consumeQuotedStringOrToken();
     73     bool consumeCharacter(char);
     74 
     75     void skipSpaces();
     76 
     77     const char* m_current;
     78     const char* const m_end;
     79     String m_currentToken;
     80 };
     81 
     82 } // namespace blink
     83 
     84 #endif // WebSocketExtensionParser_h
     85