NonZeroRandom(Digits mod, Digits arr, int n, Random generator)
{
if (Digits.Compare(mod, 1U, n) <= 0)
{
throw new ArgumentException();
}
int ntry = 0;
do
{
ntry++;
Debug.Assert(ntry <= 100, "too many iterations");
Random(mod, arr, n, generator);
} while (Digits.SigDigitN(arr, n) == 0);
}
internal void _ToModular(Digits a, int aDigitN, Digits b)
{
Digits aR;
int aRDigitN;
if (Digits.Compare(a, aDigitN, _mod, _digitN) >= 0)
{
aR = new Digits(_digitN);
Digits.Div(a, aDigitN, _mod, _digitN, _leftRecip, null, aR);
aRDigitN = _digitN;
}
else
{
aR = a;
aRDigitN = aDigitN;
}
aRDigitN = Digits.SigDigitN(aR, aRDigitN);
Digits.Set(aR, aRDigitN, b, _digitN);
_Shift(b, _scaleBitN, b);
}