Certain filenames between 245 and 255 characters long would cause an

Certain filenames between 245 and 255 characters long would cause an
internal error if pax extended attributes were being generated.  Being
< 255 characters, the first-pass path editing (to generate a
ustar-compatible name for the main entry) wouldn't occur, and the
second-pass path editing (to generate a ustar name for the pax
attributes entry) assumed the input was already < 245 chars.

The core problem here was using an abbreviated algorithm for the
second pass that relied on the first pass having already run.  The
rewritten code is much simpler: It just uses the full path-shortening
algorithm for building both ustar pathnames.  This way, the second
ustar pathname will always be short enough.

Thanks to: Mark Cammidge
Related to: bin/74385