code: def ReadLines(self, file_object):
      
      lines_size = len(self.lines)
      if lines_size < self._buffer_size:
        lines_size = self._buffer_size - lines_size
        while lines_size > 0:
          line = self._ReadLine(file_object)
          if not line:
            break
  
          self.lines = ''.join([self.lines, line])
          lines_size -= len(line)
docs: Reads lines into the lines buffer.
  
      Args:
        file_object (dfvfs.FileIO): file-like object.