[issue2523] binary buffered reading is quadratic

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

I don't understand the second loop (where n is given). If n is given,
there should be only a single read operation, using

  max(buffer_size, n-avail)

(i.e. the way it is in patch 2). In particular, if the stream is
unbuffered, it shouldn't ever end up with buffered data.

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nosy: +loewis

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<http://bugs.python.org/issue2523>
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