[vtkusers] adding encryption capability to VTK reader/writers

[Sean McInerney]

Hamid,

   I would have a look at how the vtkInputStream subclass 
vtkBase64InputStream is implemented. It does some simple decoding on the 
fly. Also check out vtkDataCompressor subclass vtkZLibDataCompressor and 
see how these work with vtkXMLDataReaders. These are the particular 
models that fit your goals.

-Sean

Hamid wrote:
> Hi
> 
> I'd like to add encryption/decryption capablity to vtk. I have couple 
> of  files, which I have encrypted, and want to read them in and use vtk 
> on  them. My encryption/decryption algorithm is a simple class which can 
> read  data byte by byte untill it feels its 4096-byte long buffer and 
> then it  decrypts them. (I can change the buffer length)
> 
> Since my files are huge and decryption process takes a lot of time, I 
> was  thinking of taking advantage of stream property of vtk and 
> integrate my  code into reader/writers of it. So whenever user requests 
> new data from my  file, it gets decrypted on the fly.
> 
> So can you please help me ? I know this is not a simple issue but any 
> type  of help is appreciated.
> I have checked the vtk classes and to me it seems that I have to work 
> with  Update() members of vtkImageData and vtkDataObject.
> 
> Can you please name a reference (web link, book, article...) that will  
> help me in this task ?
> 
> Thanks in advance
> Hamid
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