def huffman_compute_decode_tree(cls):
        # type: () -> None
        """ huffman_compute_decode_tree initializes/builds the static_huffman_tree

        @return None
        @raise InvalidEncodingException if there is an encoding problem
        """
        cls.static_huffman_tree = HuffmanNode(None, None)
        i = 0
        for entry in cls.static_huffman_code:
            parent = cls.static_huffman_tree
            for idx in range(entry[1] - 1, -1, -1):
                b = (entry[0] >> idx) & 1
                if isinstance(parent[b], bytes):
                    raise InvalidEncodingException('Huffman unique prefix violation :/')  # noqa: E501
                if idx == 0:
                    parent[b] = chb(i) if i < 256 else EOS()
                elif parent[b] is None:
                    parent[b] = HuffmanNode(None, None)
                parent = parent[b]
            i += 1