gistfile1.go

// Node is either HuffmanLeaf or HuffmanNode
// Leaf = only value
// Node = left and right, both are either a leaf or a node

node := (*fp.tree).(HuffmanNode)
for fp.finished == false {
	if r.readBits(1) == 1 {
		switch i := node.right.(type) {
		case HuffmanLeaf:
			i.value.(FieldPathOpFcn)(r, fp)
			break
		case HuffmanNode:
			node = i
			break
		}
	} else {
		switch i := node.left.(type) {
		case HuffmanLeaf:
			i.value.(FieldPathOpFcn)(r, fp)
			break
		case HuffmanNode:
			node = i
			break
		}
	}
}