docs: def parse(self):
          """
          Parses a backup file header. Will be done automatically if
          used together with the 'with' statement
          """
          self.fp.seek(0)
          magic = self.fp.readline()
          assert magic == b'ANDROID BACKUP\n'
          self.version = int(self.fp.readline().strip())
          self.compression = CompressionType(int(self.fp.readline().strip()))
          self.encryption = EncryptionType(self.fp.readline().strip().decode())
          self.__data_start = self.fp.tell()