Swift support for Bethesda's BSA file format, as used by Skyrim, Fallout, etc.

Currently this version of the code supports version 105, as used by Skyrim SE/AE.

Support for earlier versions may be added at some later date.

This is an early version, and it currently only supports extracting a .bsa file to a directory, and packing a directory to a compressed archive.

Right now it's just a library and some tests.

The next step will be to add a command line tool target, but I envisage it mostly being used as a library, linked to by other tools.

This is part of a larger tools project.

It's what I use for the day job, has decent cross platform support, and I needed an excuse to mess around with some binary streaming and async/await things.

1. Although I play Skyrim on a PC, I do most of my coding work on a Mac.
2. OpenMW supports Windows/MacOS/Linux. At some point I'd like to extend this tool and the other things I'm working on to support OpenMW.

## Useful Info

• File Format: https://en.uesp.net/wiki/Skyrim_Mod:Archive_File_Format
• Pyffi definitions (possibly incomplete): https://github.com/niftools/pyffi/blob/develop/pyffi/formats/bsa/bsa.xml
• Some Notes: https://github.com/focustense/easymod/tree/master/Focus.Apps.EasyNpc
• Other Implementations:
  • https://github.com/focustense/easymod/blob/master/Focus.Storage.Archives/README.md
  • https://github.com/Guekka/libbsarch
  • https://github.com/TES5Edit/TES5Edit/tree/dev/Tools/BSArchive

The example data in this repo is taken from Parapets, who helpful makes all their mods available under an MIT license.