[patch] Buffered seek.

[Adam D. Moss]

Hello!

The attached patch avoids throwing away our precious buffered
data (and saves an actual abstracted seek() and subsequent re-
buffering) when the user does a seek (forward or backwards) that
is short enough to lay within the currently-buffered region.  The
cost is an abstracted tell() per seek on a buffered handle (very
cheap in real life, I hope).

The patch isn't against HEAD, but it should apply okay.

Regards,
--Adam
-- 
Adam D. Moss   . ,,^^   adam at gimp.org   http://www.foxbox.org/   co:3
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