[issue26877] tarfile use wrong code when read from fileobj

[Martin Panter]

Martin Panter added the comment:

Can you give a demonstration script? I don’t see how this could be triggered. If you use a tarfile mode like "r|", it internally uses a _Stream object which has a loop to do exact reads: <https://hg.python.org/cpython/annotate/v3.5.1/Lib/tarfile.py#l567>.

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nosy: +martin.panter
stage:  -> test needed

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<http://bugs.python.org/issue26877>
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