support CBR, CB7 via libarchive

[clach04]

https://github.com/Changaco/python-libarchive-c https://github.com/fsspec/filesystem_spec/blob/master/fsspec/implementations/libarchive.py

[clach04]

Alternative libs:

• https://github.com/miurahr/py7zr
• https://github.com/markokr/rarfile - pure python for uncompressed, uses external binaries for compressed
• https://ssokolow.com/scripts/rar.py
• https://github.com/kyegupov/py-unrar2 Also see https://github.com/clach04/comic-book-tools/blob/main/README.md research notes

[clach04]

Python 3.6 support needed for https://github.com/markokr/rarfile needs:

from __future__ import print_function  # for python 2.7
## but f-strings are used which are Python 3.6+

Look at using converter to generate a 2.7 version. E.g. using https://github.com/mbarkhau/lib3to6

[clach04]

Python 3.6 support needed for https://github.com/markokr/rarfile needs:

from __future__ import print_function  # for python 2.7
## but f-strings are used which are Python 3.6+

Look at using converter to generate a 2.7 version. E.g. using https://github.com/mbarkhau/lib3to6

Attempted and encountered issues, https://gitlab.com/mbarkhau/lib3to6/-/issues/11 lib3to6 requires significant rewrite of rarfile.

Consider alternative tools instead:

• Modernize and fissix - wrong direction!
• https://github.com/PythonCharmers/python-future
  • https://python-future.org/
  • pasteurize
• https://github.com/nvbn/py-backwards
• 3to2