[vtkusers] vtkJPEGReader can read from memory, vtkPNGReader not. why?

[Kolja Petersen]

Heya,
I was searching for a solution to read PNG data, when I have their bytes in
memory, not on disk.
You can use vtkJPEGReader::SetMemoryBuffer(addr) for JPEG data. I have
tested this successfully.
In https://github.com/Kitware/VTK/blob/master/IO/Image/vtkJPEGReader.cxx,
starting from line 91, is the code for reading from memory.

Why is there no equivalent for vtkPNGReader? Even if I set the MemoryBuffer
for vtkPNGWriter, it tries to read from file and fails if the file doesn't
exist.
Thank you
Kolja

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