libtar: fix size computation of PAX line length

This commit attempts to fix the following two problems:

 - The number of digits computation returning an off-by-one result
   if the number is 10, or the resulting digit string starts
   with "10". This results in one-too-many padding bytes, corrupting
   the rest of the archive since the headers now don't start at
   multiples of 512 anymore.

 - Adding the line length prefix affects the line length (duh). If it
   grows far enough to require more digits, the result is a similar
   problem. This is a converging series that we need to compute the
   limit of.

Unit tests for this still need to be added. Or maybe I can convince a
bored undergrad student to provide an induction proof.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

0 files changed, 0 insertions, 0 deletions