90 Rotation in one buffer only

Hii All,
I'm new here. I'm searching soln for this particluar problem. any help
would be appreciated.

what could be the BEST Memory Optimal way of rotating an image or
matrix by 90
degrees using input buffer only? i.e. Input buffer only is the output
memory buffer.

Say, we can use small amount of memory locations (say 30-40 bytes extra
considering 1 pixel/byte) for temporary storage of any block/blocks in
the image but not the whole of image.

Thanks and Regards,
Naresh

.

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