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iodevice.h

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/***************************************************************************
    iodevice.h  -  Definition of IODevice class.
                             -------------------
    begin                : June 21 2002
    copyright            : (C) 2003 by Vojtìch Toman
    email                : vtoman@lit.cz
 ***************************************************************************/

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

#ifndef IODEVICE_H
#define IODEVICE_H



#include <cstdlib>
#include "defs.h"
#include "exceptions.h"


typedef size_t IOSize;



enum IOState
{
  ReadOk,

  ReadError,

  WriteOk,

  WriteError,

  EndOfFile,

  DeviceNotPrepared

}; //IOState



class IODevice
{
public:
  IODevice() { prepared = false;}

  virtual void prepare(void) throw (ExaltIOException) = 0;

  virtual void flush(void) throw (ExaltIOException) = 0;

  virtual void finish(void) throw (ExaltIOException) = 0;

  virtual IOState readData(char *buf, IOSize length) throw (ExaltIOException) = 0;

  virtual IOState getChar(int *c) throw (ExaltIOException) = 0;

  virtual IOState writeData(const char *buf, IOSize length) throw (ExaltIOException) = 0;

  virtual IOState putChar(int c) throw (ExaltIOException) = 0;

  virtual IOSize bytesReadTotal(void) = 0;

  virtual IOSize bytesRead(void) = 0;


  virtual IOSize bytesWritten(void) = 0;

  virtual bool errorOccurred(void) = 0;

  virtual bool eof(void) = 0;

  virtual bool isPrepared(void) { return prepared; }

protected:
  bool prepared;

}; //IODevice



#endif //IODEVICE_H

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