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

[Michael Becker]

Michael Becker <spammb at gmail.com> added the comment:

In case it isn't obvious the work around for pre 3.0 to get the right
sum is something like:
x=zlib.adler32(str)
if x < 0:
    x=(long(x) + 4294967296L) # 2^32, long may or may not be needed here

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nosy: +mbecker

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