Parse until a given byte string is found.

def _parse(self, stream, context, path):
        """Parse until a given byte string is found."""
        objs = []
        while True:
            start = stream.tell()
            test = stream.read(len(self.find))
            stream.seek(start)
            if test == self.find:
                break
            else:
                subobj = self.subcon._parse(stream, context, path)
                objs.append(subobj)
        return objs