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Extent C API IO capabilties


With current LibRaw, custom IOs can be implemented by subclassing
LibRaw_abstract_datastream. But this is only available with the C++ API, the
C API only alows to open_file() or open_buffer(). In order to give the C API
more flexibility regarding IOs, I've started working on a LibRaw_proxy_datastream
class that would do IOs by calling a simple set of C callbacks provided by caller.
Initial code is here:

I'd be happy to get your feedbacks regarding this work, and I'm especilly
intereted in knowing if you would be willing to add this to upstream LibRaw.

Thank you very much!