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Using C API: How you use datastream?

I have setup an exif parser callback. I correctly receive the copyright tag. I assume I have to read his value using passed ifp argument (The pointer to LibRaw_abstract_datastream input stream, positioned to start of data). But how can I do that using the C API?

Context: My program is written with Delphi which can use any C-API from DLL, but Delphi can't use C++ objects.