entire `.bz2` files must be read before processing

[jtmoon79]

Summary

The entire .bz2 file is uncompressed to get it's uncompressed size before processing. Using crate bzip2-rs.

Current behavior

BZIP2 file format does not specify an uncompressed size field.

Conclusion

It doesn't appear there is anything that can be done about this. This Issue is merely denoting the problem exists for reference from elsewhere (like the README.md)

Also see

Follow-on from #40
Similar to #293 regarding .lz4
Meta-Issue #182

[jtmoon79]

Would bzip2 fix this?