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LibRaw assumes *full* raw

LibRaw assumes *full* raw file is available. If not, the file may be rejected.

In some cases only some part of file is sufficient for metadata parse, but there is no general rule: it is possible that RAW data is recorded before some other metadata (this is the case for Canon CRW files, for example.

You may implement own I/O layer which will ask downloader to download requested file part(s)

-- Alex Tutubalin @LibRaw LLC