unpack.py

#!/usr/bin/python

# This program is copied from web, but I don't known the origin.

import argparse
from zipfile import ZipFile, ZipInfo

class ApkFile(ZipFile):
    def extract(self, member, path=None, pwd=None):
        if not isinstance(member, ZipInfo):
            member = self.getinfo(member)
        member.flag_bits ^= member.flag_bits%2
        ZipFile.extract(self, member, path, pwd)
        print 'extracting %s' % member.filename
                

    def extractall(self, path=None, members=None, pwd=None):
        map(lambda entry: self.extract(entry, path, pwd), members if members is not None  and len(members)>0 else self.filelist)
                
if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='unpacks an APK that contains files which are wrongly marked as encrypted')
    parser.add_argument('apk', type=str)
    parser.add_argument('file', type=str, nargs='*')
    args = parser.parse_args()

    apk = ApkFile(args.apk,'r')
    apk.extractall(members=args.file)