docs: def alloc_buffer(self, length):
          """
          Allocate a buffer (a range of uninitialized memory).
  
          Arguments:
              length(int): The length of the buffer to allocate.
  
          Returns:
              ~pwnypack.types.Buffer: The object used to address this buffer.
          """
  
          buf = Buffer(sum(len(v) for v in six.iterkeys(self.data)) + sum(v.length for v in self.buffers), length)
          self.buffers.append(buf)
          return buf