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Do you use same compiler

Do you use same compiler settings (esp. structure fields alignment) in LibRaw compilation and your app compilation.
If structures are aligned differently, you may think you use params.half_size, but really change other structure field.

Try to use default settings (i.e. no raw.imgdata.params.... assignment).

I've tried both your samples without any problem (using dcraw_emu LibRaw sample with -mem switch to use open_buffer() interface)

-- Alex Tutubalin