code: def huffman_compute_decode_tree(cls):
          # type: () -> None
          
          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
docs: huffman_compute_decode_tree initializes/builds the static_huffman_tree
  
          @return None
          @raise InvalidEncodingException if there is an encoding problem