#!/usr/bin/env python3

import os, sys

chunk_size = sys.int_info.sizeof_digit

magic = [0]
for i in range(chunk_size):
magic.append((magic[i]) << 8 | 0x22)

for radio in [f for f in os.listdir('.') if f[-3:].lower() == 'adf']:
print('Converting {}... '.format(radio), end = '', flush = True)
with open(radio, 'rb') as adf, open (radio[:-3] + 'mp3', 'wb') as mp3:
while True:
chunk = adf.read(chunk_size)
if not chunk:
break
bytes_read = len(chunk)
new_chunk = (int.from_bytes(chunk, sys.byteorder) ^ magic[bytes_read]).to_bytes(bytes_read, sys.byteorder)
mp3.write(new_chunk)
print('OK', flush = True)