python -c 'import xdrlib'
<string>:1: DeprecationWarning: 'xdrlib' is deprecated and slated for removal in Python 3.13

The easiest option is to vendor the xdrlib module. We could also only vendor the parts we use (we only need the Unpacker class).

As I stare at the code in that module, though, I do wonder if we could really just directly implement the pieces we need using the existing binary I/O support code we have in the NEXRAD code.