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crc-8 and crc-16 code...

P: n/a
Hello
Does have anybody procedures for:
CRC-8: polynomial x^8 + x^7 + x^2 + 1
i CRC-16: polynomial x^16 + x^15 + x^2 + 1
?

Feb 21 '07 #1
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5 Replies


P: n/a
Mamut wrote:
Does have anybody procedures for:
CRC-8: polynomial x^8 + x^7 + x^2 + 1
i CRC-16: polynomial x^16 + x^15 + x^2 + 1
?
Have you tried googling for those?
Feb 21 '07 #2

P: n/a
Have you tried googling for those?
yes but for this polynomials I can't find...
Feb 21 '07 #3

P: n/a
Mamut wrote:
>Have you tried googling for those?

yes but for this polynomials I can't find...
If you just need to calculate polynomials, what's the problem?
Write a function that takes your argument and multiplies and
adds what you need. Example:

// 'n' = degree, 'a' = array of factors (sized n+1)
// 'x' = parameter
double polynomial(double x, double *a, size_t n)
{
double result = a[n];
while (n) {
result *= x;
result += a[--n];
}
return result;
}

Now, all you need is to define the proper arguments...

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Feb 21 '07 #4

P: n/a
>
If you just need to calculate polynomials, what's the problem?
Write a function that takes your argument and multiplies and
no, I need to calculate CRC sum based on these polinomials and I can't
do this.

Feb 22 '07 #5

P: n/a
Mamut wrote:
>If you just need to calculate polynomials, what's the problem?
Write a function that takes your argument and multiplies and

no, I need to calculate CRC sum based on these polinomials and I can't
do this.
This sound like an admission of defeat. What seems to be the problem?
Do you have the algorithm? If yes, have you attempted to convert it
into C++ terms? If yes, do you get compiler errors? If yes, read the
FAQ 5.8. If you don't have the algorithm, we can't help you. Try
posting to comp.programming or search for it on the web. Once you
find the algorithm, try writing it down in C++ terms. If you don't
succeed (and how would you know unless the compiler complains, right?),
post what you have and the errors (IOW, follow the recommendations of
FAQ 5.8).

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Feb 22 '07 #6

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