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IO/vtkBase64InputStream.h

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 =========================================================================*/
00036 #ifndef __vtkBase64InputStream_h
00037 #define __vtkBase64InputStream_h
00038 
00039 #include "vtkInputStream.h"
00040 
00041 class VTK_IO_EXPORT vtkBase64InputStream : public vtkInputStream
00042 {
00043 public:
00044   vtkTypeRevisionMacro(vtkBase64InputStream,vtkInputStream);
00045   static vtkBase64InputStream *New();
00046   void PrintSelf(ostream& os, vtkIndent indent);
00047   
00051   void StartReading();
00052   
00055   int Seek(unsigned long offset);
00056   
00058   unsigned long Read(unsigned char* data, unsigned long length);
00059   
00064   void EndReading();
00065 protected:
00066   vtkBase64InputStream();
00067   ~vtkBase64InputStream();  
00068   
00069   // Number of decoded bytes left in Buffer from last call to Read.
00070   int BufferLength;
00071   unsigned char Buffer[2];
00072   
00073   // Reads 4 bytes from the input stream and decodes them into 3 bytes.
00074   int DecodeTriplet(unsigned char& c0, unsigned char& c1, unsigned char& c2);
00075 
00076 private:
00077   vtkBase64InputStream(const vtkBase64InputStream&);  // Not implemented.
00078   void operator=(const vtkBase64InputStream&);  // Not implemented.
00079 };
00080 
00081 #endif