- Read buffer is now as large as the largest possible read.
- Read buffer is now as large as the largest possible read.

This reduces all buffer updates to a single net read and data buffer write.

- Recoded core of the update and copy loop to make it less hairy.
- Added comments to some methods.


git-svn-id: 769d22dfa2d22aad706b9a451492fb87c0735f19@11758 08b38cba-cd3b-11de-854e-f91c5b6e4272

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