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Yes, RawSpeed is faster for

Yes, RawSpeed is faster for huffman-compressed formats (Canon CR2, Nikon NEF, some others).

Please note: LibRaw is tested with RawSpeed's 'master' branch ( which is very old, last updated in May 2014.
Up-to-date 'develop' branch is untested, not sure that LibRaw will work with.

My pseudo-code above is correct if you use sizes.raw_pitch

-- Alex Tutubalin @LibRaw LLC