Line intersection with AABB Rectangle?

Preferably without using any kind of loop, as this'll be used in a game.

I wish to intersect a line with a rectangle, of arbitrary size. But I also wish for the intersection point[s] to be returned.

It's possible, I've done a little googling, but still have not worked it out.

The line is defined using (x1,y1,x2,y2). The rectangle has these two points too.