StreamDataReader.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_StreamDataReader_hxx
#define __ccxx_StreamDataReader_hxx

#include <commonc++/DataReader.h++>
#include <commonc++/CircularBuffer.h++>

namespace ccxx {

class COMMONCPP_API StreamDataReader : public DataReader
{
 public:

  StreamDataReader(Stream& stream, size_t bufferSize = BUFFER_SIZE);

  ~StreamDataReader();

  void skip(size_t count);

  void reset();

  void setOffset(int64_t offset);

  static const size_t BUFFER_SIZE;

 protected:

  size_t read(byte_t* buf, size_t count);

 private:

  Stream& _stream;
  CircularByteBuffer _buffer;

  CCXX_COPY_DECLS(StreamDataReader);
};

} // namespace ccxx

#endif // __ccxx_StreamDataReader_hxx