code: def getDataAtOffset(self, offset, size):
          
          data = str(self)
          return data[offset:offset+size]
docs: Gets binary data at a given offset.
          
          @type offset: int
          @param offset: The offset to get the data from.
          
          @type size: int
          @param size: The size of the data to be obtained.
          
          @rtype: str
          @return: The data obtained at the given offset.