Upstream basE91 0.6.0 by Joachim Henke, vendored unmodified.

These files are the test oracle for the legacy format (spec 0008 section 4,
spec 0009 section 1). They must never be edited. The test
`vendored_reference_is_pristine` checks their sha256 against the table
below.

Release tarball
  URL:    https://downloads.sourceforge.net/project/base91/basE91/0.6.0/base91-0.6.0.tar.gz
  Size:   15009 bytes
  sha256: 02cfae7322c1f865ca6ce8f2e0bb8d38c8513e76aed67bf1c94eab1343c6c651

Files (from base91-0.6.0/ in the tarball), archived by Software Heritage:

  base91.c  swh:1:cnt:3d9d7eaab6294bffff9bb152b5128c2b8f4820b9
            sha256:ce6c825e24342271b525f2cecc5f70294047246963cc5361003326c9d6ce8290
  base91.h  swh:1:cnt:7a44a60b357e749b24d543d12473977c74b4acb1
            sha256:30d476141130aa6391a240c9b94e42e60f71b38f056a2a349fec9bc96562b6bf
  cli.c     swh:1:cnt:f3659915368a1d514fbb6c56db88e9b01d0f48cc
            sha256:a37ce4cebb71ad7e6d0c23157e651ec6848770fd6fb931706b70a2c044ba87d5
  LICENSE   swh:1:cnt:e4a656c3d492a79494cfe554b1ae7562d3a7b6de
            sha256:51f70a0b8d3df8662f97469234af3c8fbf780b8d853568ff9d32b56d6d4b996b

Software Heritage resolves a SWHID at
  https://archive.softwareheritage.org/<SWHID>

The three source files are byte-identical to src/base91.c, src/base91.h
and src/cli.c at tag v0.1.0 of this repository.

Vendored on 2026-09-27.
