Pathfinding.GridGraph.CheckConnection C# (CSharp) Method

        public bool CheckConnection(GridNode node, int dir)
        {
            if (neighbours == NumNeighbours.Eight) {
                return node.GetConnection (dir);
            } else {
                int dir1 = (dir-4-1) & 0x3;
                int dir2 = (dir-4+1) & 0x3;

                if (!node.GetConnection (dir1) || !node.GetConnection (dir2)) {
                    return false;
                } else {
                    GridNode n1 = nodes[node.GetIndex ()+neighbourOffsets[dir1]] as GridNode;
                    GridNode n2 = nodes[node.GetIndex ()+neighbourOffsets[dir2]] as GridNode;

                    if (!n1.walkable || !n2.walkable) {
                        return false;
                    }

                    if (!n2.GetConnection (dir1) || !n1.GetConnection (dir2)) {
                        return false;
                    }
                }
                return true;
            }
        }