internal static void DivByTwo(this RawNum num)
{
UInt32 leadingBit = 0;
for (int i = num.Size - 1; i >= 0; i--)
{
UInt32 bitVal = num.Digits[i];
num.Digits[i] = (leadingBit << 15) | (bitVal >> 1);
leadingBit = bitVal & 1;
}
num.RemoveLeadingZeros();
}
internal static void Dec(this RawNum num)
{
const UInt32 leadingBit = (1 << 16);
UInt32 z = 1;
for (int i = 0; i < num.Size && z > 0; i++)
{
UInt32 sub = (leadingBit | num.Digits[i]) - z;
num.Digits[i] = sub & UInt16.MaxValue;
z = (~sub & leadingBit) >> 16;
}
num.RemoveLeadingZeros();
}