[issue12848] pickle.py treats 32bit lengths as signed, but _pickle.c as unsigned

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

What if just add " & 0xFFFFFFFF"?

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nosy: +serhiy.storchaka
versions: +Python 3.4

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<http://bugs.python.org/issue12848>
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