[issue19219] speed up marshal.loads()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> - unmarshalling ASCII strings is faster: you can pass 127 to PyUnicode_New without scanning for non-ASCII chars

You should ensure that loaded bytes are ASCII-only. Otherwise broken or malicious marshalled data will compromise you program. Decoding UTF-8 is so fast as decoding ASCII (with checks) and is almost so fast as memcpy.

As for output, we could use cached UTF-8 representation of string (always exists for ASCII only strings) before calling PyUnicode_AsUTF8String().

I'm good with buffering and codes for short strings and tuples (I have not examined a code closely yet), but special casing ASCII looks not so good to me.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue19219>
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