[vtkusers] vtkXMLReader and vtkXMLWriter data headers

[Sebastien Jourdain]

You might be able to find some good comments or logic in that code base

https://github.com/Kitware/vtk-js/blob/master/Sources/IO/XML/XMLReader/index.js#L142-L150

On Mon, Jun 25, 2018 at 7:20 AM Edern Haumont <edern.haumont at kitware.com>
wrote:

> Hello,
>
> I am writing a python application which requires to send a stored
> compressed vtkImageData by block to a client.
> I read on this <https://www.vtk.org/Wiki/VTK_XML_Formats> (
> https://www.vtk.org/Wiki/VTK_XML_Formats) link (and by looking at the
> vtkXMLWriter source) that the actual data array is preceded by some header.
> Either :
> - [#bytes]*[DATA] *if the data is not compressed
> - [#blocks][#u-size][#p-size][#c-size-1][#c-size-2]...[#c-size-#blocks]*[DATA]
> *if it is compressed.
>
> My problem : I did not succeed in manually reading those values, either in
> the uncompressed (binary or ascii) or compressed case. Does anyone have any
> pointer or example on how to do that ? I could not find a lot of
> documentation on the subject.
>
> Also side question : I am not sure the ZLib compressor uses a full flush.
> If that is not the case, it seems impossible to read only one random data
> block. Am I right ?
>
> Thanks a lot.
> Bests.
>
> --
> Edern Haumont
> *edern.haumont at kitware.com* <edern.haumont at kitware.com>
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