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Similar to the hex blob decoder, we need this once for tar and
once for the filemap xattr parser.
Simply add a single, central implementation to libutil, with a
simple unit test, and then use it in both libtar and gensquashfs.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Since we need it twice (once for tar, once for the filemap xattr
parser), add a single, central implementation to libutil, add a
unit test for that implementation and then use it in both libtar
and gensquashfs.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Some of the on-disk format internals are moved to a separate header
and some of the stuff from internal.h is moved to that format header.
C++ guards are added in addtion.
Everything PAX related is moved to pax_header.c, some internal
functions are marked as static.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The idea was originally to use struct stat in the libfstree code, so
we can simply hose data read from a directory into the fstree_t. The
struct was then also used with libtar, for simpler interoperation,
but it turned out to introduce a lot of platform quirks and causes
more trouble than it's worth.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of having a long if-else-if chain, replace the PAX header
field parsing with a table driven approach.
Altough it is more code, it is hopefully more readable, maintainable,
extensible and it dedupliates some of the value parsing code.
The GNU.sparse parsing is left as is, because it requires
maintaining state.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Split the key/value pairs right in the header and terminate the key
name. This way, some of the magic numbers can be eliminated.
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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Contrary to previous claims, support for the GNU tar sparse format 1.0
was missing entirely (the newest of their 3 different sparse mapping
formats). This oversight wasn't caught, because the unit test was
compiling the wrong source file and tar2sqfs had no problem processing
the test file because it is still a valid POSIX-ish tar archive (but
the sparse part was missing and the mapping embedded in the file).
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Simply moving the pax header decoding to a separate file and splitting
out the common helper functions should be a good start.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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