public GaloisPolynomial Multiply(GaloisPolynomial factorPolynomial)
{
if (!m_Field.Equals(factorPolynomial.m_Field))
{
throw new NFXException(StringConsts.ARGUMENT_ERROR + GetType().Name + ".Mult(factor: different field)");
}
if (IsPolynomial0 || factorPolynomial.IsPolynomial0)
{
return(m_Field.Polynomial0);
}
int[] multiplicand = m_Coefficients;
int[] factor = factorPolynomial.m_Coefficients;
int[] product = new int[m_Coefficients.Length + factorPolynomial.m_Coefficients.Length - 1];
for (int i = 0; i < multiplicand.Length; i++)
{
int multiplicandCoefficient = multiplicand[i];
for (int j = 0; j < factor.Length; j++)
{
product[i + j] = GaloisField.Add(product[i + j], m_Field.Multiply(multiplicandCoefficient, factor[j]));
}
}
return(new GaloisPolynomial(m_Field, product));
}
public GaloisPolynomial Add(GaloisPolynomial summand)
{
if (!m_Field.Equals(summand.m_Field))
{
throw new NFXException(StringConsts.ARGUMENT_ERROR + GetType().Name + ".Add(summand: different field)");
}
if (IsPolynomial0)
{
return(summand);
}
if (summand.IsPolynomial0)
{
return(this);
}
int[] shorterPolynomialCoefficients;
int[] longerPolynomialCoefficients;
if (m_Coefficients.Length < summand.m_Coefficients.Length)
{
shorterPolynomialCoefficients = m_Coefficients;
longerPolynomialCoefficients = summand.m_Coefficients;
}
else
{
shorterPolynomialCoefficients = summand.m_Coefficients;
longerPolynomialCoefficients = m_Coefficients;
}
int[] resultCoefficients = new int[longerPolynomialCoefficients.Length];
int deltaLength = (int)(longerPolynomialCoefficients.Length - shorterPolynomialCoefficients.Length);
for (int i = 0; i < longerPolynomialCoefficients.Length; i++)
{
if (i < deltaLength)
{
resultCoefficients[i] = longerPolynomialCoefficients[i];
}
else
{
resultCoefficients[i] = GaloisField.Add(longerPolynomialCoefficients[i], shorterPolynomialCoefficients[i - deltaLength]);
}
}
return(new GaloisPolynomial(m_Field, resultCoefficients));
}
