Convert cache from .uc! to .mp3 @ music.163.com

crackmusic163.py

'''
Description: convert cache from music.163.com to mp3
Usage: python3 crackmusic163.py sourcefile [...]
Output: cache files converted to mp3 in current directory
'''
def crack163Cache(srcfile):
    dstfile = srcfile.rstrip('uc!') + 'mp3'
    with open(srcfile, 'rb') as f1, open(dstfile,'xb') as f2:
        data = bytearray(f1.read())
        for i in range(len(data)):
            data[i] = data[i] ^ 163
        f2.write(data)
    print("Output:", dstfile)

if __name__ == '__main__':
    import sys
    if len(sys.argv) < 2:
        print('Usage: python3', sys.argv[0], 'sourcefile')
        sys.exit()
    for file in sys.argv[1:]:
        if file.endswith('.uc!'): crack163Cache(file)