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You do not need adjust_sizes.

You do not need adjust_sizes....() if you plan (or use) unpack()/dcraw_process() calls.
These calls (generally, dcraw_process()) will adjust image sizes correctly.

adjust_sizes_info_only() call is made specifically for metadata-parsing applications (take look into LibRaw/samples/raw-identify.cpp sample, this sample prints A LOT of metadata if called with -v switch)

-- Alex Tutubalin @LibRaw LLC