unmozlz4.py

#!/usr/bin/env python
import io
import sys

import lz4

MAGIC = b'mozLz40\0'

for path in sys.argv[1:]:
    with io.open(path, 'rb') as f:
        magic = f.read(len(MAGIC))
        if magic != MAGIC:
            raise Exception('Bad magic number')

        print(lz4.decompress(f.read()).decode("utf-8"))