Lineage 2 Music ogg decrypter

convert.py

import mmap
import sys
import os
import glob

if len(sys.argv) != 2:
	sys.exit('Usage: %s directory' % sys.argv[0])

if not os.path.exists(sys.argv[1]):
	sys.exit('ERROR: directory %s was not found!' % sys.argv[1])

files = glob.glob(sys.argv[1] + '/*.ogg')

for file in files:
	f = open(file, 'a+')
	m = mmap.mmap(f.fileno(), 0)
	print m[0:4]
	if m[0:4] == 'L2SD':
		m[0:4] = 'OggS'
	m.close()
	f.close()

Python 3 version fix:

import mmap
import sys
import os
import glob

if len(sys.argv) != 2:
    sys.exit('Usage: %s directory' % sys.argv[0])

if not os.path.exists(sys.argv[1]):
    sys.exit('ERROR: directory %s was not found!' % sys.argv[1])

files = glob.glob(sys.argv[1] + '/*.ogg')

for file in files:
    f = open(file, 'a+')
    m = mmap.mmap(f.fileno(), 0)
    print(m[0:4])
    if m[0:4] == b'L2SD':
        m[0:4] = b'OggS'
    m.close()
    f.close()