[issue34010] tarfile stream read performance

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

Nice catch.

I confirmed this is a hard regression of performance.
Decompressing a file must be O(n) when n=filesize, but O(n^2) now.

While we live with this regression for a long time, I feel it's worth enough to backport.
This can be DoS vulnerability.

Can you write NEWS entry for it?

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nosy: +inada.naoki

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<https://bugs.python.org/issue34010>
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