[issue2523] binary buffered reading is quadratic

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

Oh, that is simple to fix. You can round the value 2*avail to the
nearest block by doing something like (2*avail) & ~(bksize-1) where
bksize is a power of 2, or the less magic (2*avail//bksize) * bksize.

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