code: def unpack(data):
      '''unpack from delimited data'''
      size, position = decoder._DecodeVarint(data, 0)
      envelope = wire.Envelope() 
      envelope.ParseFromString(data[position:position+size])
      return envelopf unpack(data):
      '''unpack from delimited data'''
      size, position = decoder._DecodeVarint(data, 0)
      envelope = wire.Envelope() 
      envelope.ParseFromString(data[position:position+size])
      return envelope
docs: unpack from delimited data