public BigIntegerBuilder(BigInteger bn)
{
_fWritable = false;
_bits = bn.InternalBits;
if (_bits != null)
{
_iuLast = _bits.Length - 1;
_uSmall = _bits[0];
while (_iuLast > 0 && _bits[_iuLast] == 0)
{
_iuLast--;
}
}
else
{
_iuLast = 0;
_uSmall = NumericHelper.Abs(bn.InternalSign);
}
}