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vtkBase64InputStream.h

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00001 /*=========================================================================
00002 
00003   Program:   Visualization Toolkit
00004   Module:    $RCSfile: vtkBase64InputStream.h,v $
00005   Language:  C++
00006 
00007   Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
00008   All rights reserved.
00009   See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
00010 
00011      This software is distributed WITHOUT ANY WARRANTY; without even 
00012      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00013      PURPOSE.  See the above copyright notice for more information.
00014 
00015 =========================================================================*/
00026 #ifndef __vtkBase64InputStream_h
00027 #define __vtkBase64InputStream_h
00028 
00029 #include "vtkInputStream.h"
00030 
00031 class VTK_IO_EXPORT vtkBase64InputStream : public vtkInputStream
00032 {
00033 public:
00034   vtkTypeRevisionMacro(vtkBase64InputStream,vtkInputStream);
00035   static vtkBase64InputStream *New();
00036   void PrintSelf(ostream& os, vtkIndent indent);
00037   
00041   void StartReading();
00042   
00045   int Seek(unsigned long offset);
00046   
00048   unsigned long Read(unsigned char* data, unsigned long length);
00049   
00054   void EndReading();
00055 protected:
00056   vtkBase64InputStream();
00057   ~vtkBase64InputStream();  
00058   
00059   // Number of decoded bytes left in Buffer from last call to Read.
00060   int BufferLength;
00061   unsigned char Buffer[2];
00062   
00063   // Reads 4 bytes from the input stream and decodes them into 3 bytes.
00064   int DecodeTriplet(unsigned char& c0, unsigned char& c1, unsigned char& c2);
00065 
00066 private:
00067   vtkBase64InputStream(const vtkBase64InputStream&);  // Not implemented.
00068   void operator=(const vtkBase64InputStream&);  // Not implemented.
00069 };
00070 
00071 #endif