PeterO.Cbor.FastInteger2.Multiply C# (CSharp) 메소드

        internal FastInteger2 Multiply(int val)
        {
            if (val == 0) {
            this.smallValue = 0;
            this.integerMode = 0;
              } else {
            switch (this.integerMode) {
              case 0:
            bool apos = this.smallValue > 0L;
            bool bpos = val > 0L;
            if (
              (apos && ((!bpos && (Int32.MinValue / this.smallValue) > val) ||
                    (bpos && this.smallValue > (Int32.MaxValue / val)))) ||
              (!apos && ((!bpos && this.smallValue != 0L &&
                    (Int32.MaxValue / this.smallValue) > val) ||
                    (bpos && this.smallValue < (Int32.MinValue / val))))) {
              // would overflow, convert to large
              if (apos && bpos) {
                // if both operands are nonnegative
                // convert to mutable big integer
                this.integerMode = 1;
                this.mnum = new MutableNumber(this.smallValue);
                this.mnum.Multiply(val);
              } else {
                // if either operand is negative
                // convert to big integer
                this.integerMode = 2;
                this.largeValue = (EInteger)this.smallValue;
                this.largeValue *= (EInteger)val;
              }
            } else {
              smallValue *= val;
            }
            break;
              case 1:
            if (val < 0) {
              this.integerMode = 2;
              this.largeValue = this.mnum.ToEInteger();
              this.largeValue *= (EInteger)val;
            } else {
              mnum.Multiply(val);
            }
            break;
              case 2:
            this.largeValue *= (EInteger)val;
            break;
              default: throw new InvalidOperationException();
            }
              }
              return this;
        }