0e36456bf9
* Assert that the format is GNU.
Both GNU and STAR have some form of sparse file support with
incompatible header structures. Worse yet, both formats use the
'S' type flag to indicate the presence of a sparse file.
As such, we should check the format (based on magic numbers)
and fail early.
* Move realsize parsing logic into readOldGNUSparseMap.
This is related to the sparse parsing logic and belongs here.
* Fix the termination condition for parsing sparse fields.
The termination condition for reading the sparse fields
is to simply check if the first byte of the offset field is NULL.
This does not seem to be documented in the GNU manual, but this is
the check done by the both the GNU and BSD implementations:
http://git.savannah.gnu.org/cgit/tar.git/tree/src/sparse.c?id=9a33077a7b7ad7d32815a21dee54eba63b38a81c#n731
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