> The paper on braided CRCs is in the zlib distribution: doc/crc-doc.1.0.pdf

Thanks for a tip, I read that and now it's bit clearer to me.

Maybe it is slightly faster, but I wouldn't bet dollars against nuts it's exact in my case as 7zip-crc also uses slice-by-8 algorithm and is actually faster.

Despite that the question is how do I use zlib crc32()? It doesn't give me correct result.

My 'rig' is this:

~~~

crc = -1

while (buffer, length = read_data()):

    {

    crc = crcfunc(crc, buffer, length)

    }

crc = ~crc

~~~

This doesn't work with `crc32_z();'