[File] [PATCH] Add -z/-Z support for LZMA compressed files

[Christoph Biedl]

Hi there,

while working on other issues, I noticed --uncompress/
--uncompress-noreport is not supported for LZMA compressed files.
Adding this was not too diffcult but it seemed wise to add a length
check for the callback compression detection as well to avoid
out-of-bound reads. I abused maglen for this, feel free to hate me.

Additionally I added the number of the compression method check in
the definition list, just to avoid confusion in the things that
are about to come next.

Cheers,

    Christoph
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