CRC checking
I am in need of a way to check a string for the presence of
a given CRC-16. Is there any way to easily check for the
presence of the CRC? My generating polynomial is x15+x14+x13+x11+x4+x2+x (1110100000010101). I've searched the site and found some things on CRC but not what I'm looking for.
Re: CRC checking
created: 2004-06-16 10:15:58
Re: CRC checking
created: 2004-06-16 10:16:33
Maybe Digest::CRC is doing what you need?
regards,
tomte
An intellectual is someone whose mind watches itself.
-- Albert Camus
Re^2: CRC checking
created: 2004-06-16 11:07:02
I haven't checked out digest::crc. I'll have a look at that right now. Thanks.
Re^2: CRC checking
created: 2004-06-17 05:58:26
I had a look at Digest::CRC and believe it will do what I want but documentation is very limited. Can you explain
init, xorout, refin and refout? I understand the width and poly fields.
Re^3: CRC checking
created: 2004-06-17 06:20:27
A quick glance at the source suggests that they are flags/values indicating/used for:
- refin
reflect bitwise (mirror) the input before processing the message -
refout
reflect bitwise (mirror) the processed data before returning (hmmm, unless refin is set...) -
xorout
the output is XORed with this value prior to returning it -
init
is the initial crc value
Edit: removed doubt-indicating questionmarks.
HTH,
regards,
tomte
An intellectual is someone whose mind watches itself.
-- Albert Camus