niodevice.h

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// LICENSE: (Please see the file COPYING for details)
//
// NUS - Nemesis Utilities System: A C++ application development framework 
// Copyright (C) 2006, 2007 Otavio Rodolfo Piske
//
//  This file is part of NUS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation version 2.1
//  of the License.
//
//  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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
#ifndef NIODEVICE_H
#define NIODEVICE_H

#include "ndefs.h"
#include "nobject.h"
#include "ndatastream.h"


class DllDeclSpec NIODevice: public NObject {
      public:
            enum Mode {
                  NotOpen = 1,      
                  ReadOnly = 2,     
                  ReadWrite = 4,    
                  Append = 8,       
                  Truncate = 16,    
            };
            
            NIODevice(void);
            
            virtual ~NIODevice();
            
            virtual void open(Mode mode) = 0;
            
            virtual void closeDevice(void) = 0;
            
            void setReadBufferSize(nuint32 size);
            
            nuint32 getReadBufferSize(void) const;
            
            
            virtual nint32 read(NDataStream *buffer) = 0;
            
            virtual nint32 read(NDataStream *buffer, nuint32 bytes) = 0;
            
            virtual nint32 readLine(NDataStream *buffer) = 0;
            
            virtual nint32 write(const NDataStream &data, nuint32 bytes = 0) = 0;
      
      protected:
            nuint32 m_readBufferSize;     
};

#endif // NIODEVICE_H

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