[issue1202] zlib.crc32() and adler32() return value

[Tim Lesher]

Tim Lesher added the comment:

Both CRC-32 and ADLER32 are standards (described in ISO 3309 and RFC
1950 respectively); whatever fix implemented should make sure that the
output complies.  

ISO 3309 isn't available online as far as I can see, but CRC-32
reference code is published in RFC 1952; RFC 1950 contains reference
code for ADLER32.

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nosy: +tlesher

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