<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def decode(self, data):
 """ Decode an armoured string into a chunk. The decoded output is null-terminated, so it may be treated as a string, if that's what it was prior to encoding. """

        return Zchunk(lib.zarmour_decode(self._as_parameter_, data), True)