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view paraspace/tools.py @ 104:61cef1662035

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author Thinker K.F. Li <thinker@codemud.net>
date Thu, 28 Jul 2011 00:06:54 +0800
parents b7432d6f7e93
children ff6f869273b7
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base = 65521

def adler32(adler, buf, offset, sz):
    sum1 = adler & 0xffff
    sum2 = (adler >> 16) & 0xffff
    for off in range(offset, offset + sz):
        sum1 = (sum1 + ord(buf[off])) % base
        sum2 = (sum2 + sum1) % base
        pass
    r = (sum2 << 16) | sum1
    return r