https://github.com/andrix/python-snappy
brew install snappy
$ CPPFLAGS="-I/usr/local/include -L/usr/local/lib" pip3 install python-snappy
python3 -m snappy -d BTCUSD.dat BTCUSD.dat.uncompressed
go run ./cmd/mdreader -in=./BTCUSD.dat.uncompressed -out=./BTCUSD.csv