code: def _pfp__build(self, stream=None, save_offset=False):
          
          if stream is not None and save_offset:
              self._pfp__offset = stream.tell()
  
          data = self._pfp__value + utils.binary("\x00")
          if stream is None:
              return data
          else:
              stream.write(data)
              return len(data)
docs: Build the String field
  
          :stream: TODO
          :returns: TODO