BigInteger.unsetBit C# (CSharp) 메소드

        public void unsetBit(uint bitNum)
        {
                uint bytePos = bitNum >> 5;

                if(bytePos < this.dataLength)
                {
                        byte bitPos = (byte)(bitNum & 0x1F);

                        uint mask = (uint)1 << bitPos;
                        uint mask2 = 0xFFFFFFFF ^ mask;

                        this.data[bytePos] &= mask2;

                        if(this.dataLength > 1 && this.data[this.dataLength - 1] == 0)
                                this.dataLength--;
                }
        }