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Some xz compressed tarballs (e.g. from kernel.org) are not made up of
a single xz stream, but rather contain several, independendly
compressed streams. In that case, the xz decompressor hits
an LZMA_STREAM_END early on and reports EOF. If you are lucky, the tar
reader bails (premature end-of-file). If you are unlucky, it happens
exactely between two records and is interpeted as regular end-of-file.
As this seems to be a normal use case for xz, it has a flag to just
read across the seams and only report end-of-stream if the action
is set to finish.
This commit adds the flag to the initialization propperly sets the
lzma_action depending on whether the underlying stream hit EOF or not.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Streaming compression was added fairly recently to zstd (and then
the API was changed a few times).
Rather than rely on libzstd versioning macros, this commit adds an
m4 script to test at configure time if the enums/functions we need
are available by trying to compile a small sample.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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