public QRPolynomial Multiply(QRPolynomial e)
{
var num = new DataCache(this.GetLength() + e.GetLength() - 1);
for (int i = 0; i < this.GetLength(); i++)
{
for (int j = 0; j < e.GetLength(); j++)
{
num[i + j] ^= QRMath.GExp(QRMath.GLog(this.Get(i)) + QRMath.GLog(e.Get(j)));
}
}
return(new QRPolynomial(num, 0));
}
internal static QRPolynomial GetErrorCorrectPolynomial(int errorCorrectLength)
{
QRPolynomial a = new QRPolynomial(new DataCache()
{
1
}, 0);
for (int i = 0; i < errorCorrectLength; i++)
{
a = a.Multiply(new QRPolynomial(new DataCache()
{
1, QRMath.GExp(i)
}, 0));
}
return(a);
}
public QRPolynomial Mod(QRPolynomial e)
{
if (Convert.ToInt64(this.GetLength()) - Convert.ToInt64(e.GetLength()) < 0)
{
return(this);
}
int ratio = QRMath.GLog(this.Get(0)) - QRMath.GLog(e.Get(0));
var num = new DataCache(this.GetLength());
for (int i = 0; i < this.GetLength(); i++)
{
num[i] = this.Get(i);
}
for (int i = 0; i < e.GetLength(); i++)
{
num[i] ^= QRMath.GExp(QRMath.GLog(e.Get(i)) + ratio);
}
// recursive call
return(new QRPolynomial(num, 0).Mod(e));
}