vtkBase64InputStream.h

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

  Program:   Visualization Toolkit
  Module:    vtkBase64InputStream.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 vtkBase64InputStream_h
#define vtkBase64InputStream_h

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

class VTKIOCORE_EXPORT vtkBase64InputStream : public vtkInputStream
{
public:
  vtkTypeMacro(vtkBase64InputStream,vtkInputStream);
  static vtkBase64InputStream *New();
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void StartReading() override;

  int Seek(vtkTypeInt64 offset) override;

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

  void EndReading() override;

protected:
  vtkBase64InputStream();
  ~vtkBase64InputStream() override;

  // 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&) = delete;
  void operator=(const vtkBase64InputStream&) = delete;
};

#endif