src/decoder/FileReader.hpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2 *
   3 * $Id:  $
   4 *
   5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   6 *
   7 * The contents of this file are subject to the Mozilla Public License
   8 * Version 1.1 (the "License"); you may not use this file except in compliance
   9 * with the License. You may obtain a copy of the License at
  10 * http://www.mozilla.org/MPL/
  11 *
  12 * Software distributed under the License is distributed on an "AS IS" basis,
  13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
  14 * the specific language governing rights and limitations under the License.
  15 *
  16 * The Original Code is BBC Research code.
  17 *
  18 * The Initial Developer of the Original Code is the British Broadcasting
  19 * Corporation.
  20 * Portions created by the Initial Developer are Copyright (C) 2007.
  21 * All Rights Reserved.
  22 *
  23 * Contributor(s): Andrea Gabriellini (Original Author)
  24 *
  25 * Alternatively, the contents of this file may be used under the terms of
  26 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
  27 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
  28 * the GPL or the LGPL are applicable instead of those above. If you wish to
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  34 * your version of this file under the terms of any one of the MPL, the GPL
  35 * or the LGPL.
  36 * ***** END LICENSE BLOCK ***** */
  37
  38 #ifndef _FILEREADER_HPP_
  39 #define _FILEREADER_HPP_
  40
  41 #include <common/dirac.h>
  42
  43 #include <parser/IInput.hpp>
  44
  45 #include <string>
  46 #include <cstdio>
  47 #include <stdexcept>
  48
  49
  50 namespace dirac
  51 {
  52 namespace decoder
  53 {
  54   class FileReaderException : public std::runtime_error
  55   {
  56   public:
  57     FileReaderException ( std::string const& message );
  58   };
  59
  60   class FileReader : public parser_project::IInput
  61   {
  62   public: // type definitions
  63     typedef FileReader                                  class_type; // self
  64
  65     typedef IInput::value_type                          value_type;
  66     typedef IInput::size_type                           size_type;
  67     typedef IInput::pointer                             pointer;
  68     typedef IInput::const_pointer                       const_pointer;
  69
  70     typedef FILE                                        stream;
  71
  72   public: // constructors
  73     explicit FileReader ( std::string const& filename );
  74     virtual ~FileReader();
  75   private: // compiler generated methods are not allowed
  76     FileReader ( class_type const& );
  77     class_type& operator= ( class_type const& );
  78
  79   private: // implementation of IInput virtual interface
  80     virtual bool          available() const;
  81
  82     virtual size_type     readInput ( pointer begin, size_type count );
  83
  84     virtual bool          rewindStream ( size_type count );
  85
  86     virtual bool          fullRewind();
  87
  88   private:  // members
  89     stream*               str_;
  90     static std::string    error_message_;
  91   };
  92 } /* decoder */
  93
  94 } /* dirac */
  95
  96
  97 #endif /* _FILEREADER_HPP_ */