code: def get_files_types(self):
          
          if self._files == {}:
              # Generate File Types / CRC List
              for i in self.get_files():
                  buffer = self._get_crc32(i)
                  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)
  
          At the same time, the CRC32 are calculated for the files.
  
          :rtype: a dictionnary