vtkInputStream.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkInputStream.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkInputStream_h
#define vtkInputStream_h

#include "vtkIOCoreModule.h" // For export macro
#include "vtkObject.h"

class VTKIOCORE_EXPORT vtkInputStream : public vtkObject
{
public:
  vtkTypeMacro(vtkInputStream,vtkObject);
  static vtkInputStream *New();
  void PrintSelf(ostream& os, vtkIndent indent) override;


  vtkSetMacro(Stream, istream*);
  vtkGetMacro(Stream, istream*);

  virtual void StartReading();

  virtual int Seek(vtkTypeInt64 offset);

  virtual size_t Read(void* data, size_t length);

  virtual void EndReading();

protected:
  vtkInputStream();
  ~vtkInputStream() override;

  // The real input stream.
  istream* Stream;
  size_t ReadStream(char* data, size_t length);

  // The input stream's position when StartReading was called.
  vtkTypeInt64 StreamStartPosition;

private:
  vtkInputStream(const vtkInputStream&) = delete;
  void operator=(const vtkInputStream&) = delete;
};

#endif