🚀 go-pugleaf

> [tar/stuffit conversations]

You might consider using the ARC format between systems.

ARC programs for Macintosh:
ArcMac   adds, extracts, supports "Squashing"
MacArc   extract-only, no "Squash"
DeArc    extract-only (slower), maybe has "Squash"

ARC for UNIX:
Several ports of the original MS-DOS program exist, no "Squashing"

I don't know how well the Macintosh filenames will transfer;
ArcMac sources (for extraction only) are available to see how to
decode its method of filename encoding; the UNIX program could
be adapted for your needs if it doesn't already work.

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Also, an unPackIt UNIX program exists, but only supports decompressed
files (no better than tar).