code: def readQword(self):
          
          qword = unpack(self.endianness + ('Q' if not self.signed else 'b'),  self.readAt(self.offset, 8))[0]
          self.offset += 8
          return qword
docs: Reads a qword value from the L{ReadData} stream object.
          
          @rtype: int
          @return: The qword value read from the L{ReadData} stream.