code: def get_files_types(self):
          
          if self._files == {}:
              # Generate File Types / CRC List
              for i in self.get_files():
                  buffer = self.zip.read(i)
                  self.files_crc32[i] = crc32(buffer)
                  # FIXME why not use the crc from the zipfile?
                  # should be validated as well.
                  # crc = self.zip.getinfo(i).CRC
                  self._files[i] = self._get_file_magic_name(buffer)
  
          return self._files
docs: Return the files inside the APK with their associated types (by using python-magic)
  
          :rtype: a dictionnary