[issue6715] xz compressor support

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

> In uint32_converter, I'm not sure the if statement comparing val and
> UINT32_MAX makes sense. val was defined to be unsigned long, which is
> 32bit on 32-bit compiler.

Yes, on a 32-bit system, this comparison will always be false. However,
on a 64-bit system, an unsigned long will (usually) be 64 bits wide. In
this case, we do need to check that the value fits into a uint32_t.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6715>
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