Re^2: computing CRC32 in Perl and C

I don't think this is it. I changed from mCrc = crc(s, sizeof(s), mLookup, &mMask); to mCrc = crc(s, sizeof(s)-1, mLookup, &mMask); and now, even though the results are different, they still don't agree.

perl try.pl
CRC for 'Hello Word. How are you?' is 0x8487fb61


gcc try.c; ./a.out
CRC for 'Hello Word. How are you?' is 0x7b78049e
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I have a feeling the problem is the poly, or the reflections, or the initial poly or something like that - I just can't figure out what.

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Re^3: computing CRC32 in Perl and C by roboticus (Chancellor) on Dec 13, 2007 at 20:43 UTC
Okay ... here are a couple other things to try: Are you scanning through the bits in the correct order? I notice you're scanning LSB to MSB . Is that what the CRC wants? Try calculating a single character to see if your initial conditions match up. ...roboticus	[reply]