IO/vtkBase64InputStream.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkBase64InputStream.h,v $

  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 __vtkBase64InputStream_h
#define __vtkBase64InputStream_h

#include "vtkInputStream.h"

class VTK_IO_EXPORT vtkBase64InputStream : public vtkInputStream
{
public:
  vtkTypeRevisionMacro(vtkBase64InputStream,vtkInputStream);
  static vtkBase64InputStream *New();
  void PrintSelf(ostream& os, vtkIndent indent);
  
  void StartReading();
  
  int Seek(unsigned long offset);
  
  unsigned long Read(unsigned char* data, unsigned long length);
  
  void EndReading();
protected:
  vtkBase64InputStream();
  ~vtkBase64InputStream();  
  
  // Number of decoded bytes left in Buffer from last call to Read.
  int BufferLength;
  unsigned char Buffer[2];
  
  // Reads 4 bytes from the input stream and decodes them into 3 bytes.
  int DecodeTriplet(unsigned char& c0, unsigned char& c1, unsigned char& c2);

private:
  vtkBase64InputStream(const vtkBase64InputStream&);  // Not implemented.
  void operator=(const vtkBase64InputStream&);  // Not implemented.
};

#endif

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