Spiralled Arrays

turn [1,2,3,4,5,6,7,8,9] into [9,2,3,8,1,4,7,6,5]. Make it work for an arbitrary array of size n^2. equally acceptable is [[1,2,3],[4,5,6],[7,8,9]] into [[9,2,3],[8,1,4],[7,6,5]].

how's it done?

pseudocode'll do

>>5 win