Exemplo n.º 1
0
		private static void SingleDivide(BigInteger leftSide, BigInteger rightSide, out BigInteger quotient, out BigInteger remainder)
		{
			if (rightSide.IsZero)
			{
				throw new DivideByZeroException();
			}

			DigitsArray remainderDigits = new DigitsArray(leftSide.m_digits);
			remainderDigits.ResetDataUsed();

			int pos = remainderDigits.DataUsed - 1;
			ulong divisor = (ulong)rightSide.m_digits[0];
			ulong dividend = (ulong)remainderDigits[pos];

			DType[] result = new DType[leftSide.m_digits.Count];
			leftSide.m_digits.CopyTo(result, 0, result.Length);
			int resultPos = 0;

			if (dividend >= divisor)
			{
				result[resultPos++] = (DType)(dividend / divisor);
				remainderDigits[pos] = (DType)(dividend % divisor);
			}
			pos--;

			while (pos >= 0)
			{
				dividend = ((ulong)(remainderDigits[pos + 1]) << DigitsArray.DataSizeBits) + (ulong)remainderDigits[pos];
				result[resultPos++] = (DType)(dividend / divisor);
				remainderDigits[pos + 1] = 0;
				remainderDigits[pos--] = (DType)(dividend % divisor);
			}
			remainder = new BigInteger(remainderDigits);

			DigitsArray quotientDigits = new DigitsArray(resultPos + 1, resultPos);
			int j = 0;
			for (int i = quotientDigits.DataUsed - 1; i >= 0; i--, j++)
			{
				quotientDigits[j] = result[i];
			}
			quotient = new BigInteger(quotientDigits);
		}
Exemplo n.º 2
0
		/// <summary>
		/// Multiply two BigIntegers returning the result.
		/// </summary>
		/// <remarks>
		/// See Knuth.
		/// </remarks>
		/// <param name="leftSide">A BigInteger.</param>
		/// <param name="rightSide">A BigInteger</param>
		/// <returns></returns>
		public static BigInteger operator * (BigInteger leftSide, BigInteger rightSide)
		{
			if (object.ReferenceEquals(leftSide, null))
			{
				throw new ArgumentNullException("leftSide");
			}
			if (object.ReferenceEquals(rightSide, null))
			{
				throw new ArgumentNullException("rightSide");
			}

			bool leftSideNeg = leftSide.IsNegative;
			bool rightSideNeg = rightSide.IsNegative;

			leftSide = Abs(leftSide);
			rightSide = Abs(rightSide);

			DigitsArray da = new DigitsArray(leftSide.m_digits.DataUsed + rightSide.m_digits.DataUsed);
			da.DataUsed = da.Count;

			for (int i = 0; i < leftSide.m_digits.DataUsed; i++)
			{
				ulong carry = 0;
				for (int j = 0, k = i; j < rightSide.m_digits.DataUsed; j++, k++)
				{
					ulong val = ((ulong)leftSide.m_digits[i] * (ulong)rightSide.m_digits[j]) + (ulong)da[k] + carry;

					da[k] = (DType)(val & DigitsArray.AllBits);
					carry = (val >> DigitsArray.DataSizeBits);
				}

				if (carry != 0)
				{
					da[i + rightSide.m_digits.DataUsed] = (DType)carry;
				}
			}

			//da.ResetDataUsed();
			BigInteger result = new BigInteger(da);
			return (leftSideNeg != rightSideNeg ? -result : result);
		}
Exemplo n.º 3
0
		private static void MultiDivide(BigInteger leftSide, BigInteger rightSide, out BigInteger quotient, out BigInteger remainder)
		{
			if (rightSide.IsZero)
			{
				throw new DivideByZeroException();
			}

			DType val = rightSide.m_digits[rightSide.m_digits.DataUsed - 1];
			int d = 0;
			for (uint mask = DigitsArray.HiBitSet; mask != 0 && (val & mask) == 0; mask >>= 1)
			{
				d++;
			}

			int remainderLen = leftSide.m_digits.DataUsed + 1;
			DType[] remainderDat = new DType[remainderLen];
			leftSide.m_digits.CopyTo(remainderDat, 0, leftSide.m_digits.DataUsed);

			DigitsArray.ShiftLeft(remainderDat, d);
			rightSide = rightSide << d;

			ulong firstDivisor = rightSide.m_digits[rightSide.m_digits.DataUsed - 1];
			ulong secondDivisor = (rightSide.m_digits.DataUsed < 2 ? (DType)0 : rightSide.m_digits[rightSide.m_digits.DataUsed - 2]);

			int divisorLen = rightSide.m_digits.DataUsed + 1;
			DigitsArray dividendPart = new DigitsArray(divisorLen, divisorLen);
			DType[] result = new DType[leftSide.m_digits.Count + 1];
			int resultPos = 0;

			ulong carryBit = (ulong)0x1 << DigitsArray.DataSizeBits; // 0x100000000
			for (int j = remainderLen - rightSide.m_digits.DataUsed, pos = remainderLen - 1; j > 0; j--, pos--)
			{
				ulong dividend = ((ulong)remainderDat[pos] << DigitsArray.DataSizeBits) + (ulong)remainderDat[pos - 1];
				ulong qHat = (dividend / firstDivisor);
				ulong rHat = (dividend % firstDivisor);

				while (pos >= 2)
				{
					if (qHat == carryBit || (qHat * secondDivisor) > ((rHat << DigitsArray.DataSizeBits) + remainderDat[pos - 2]))
					{
						qHat--;
						rHat += firstDivisor;
						if (rHat < carryBit)
						{
							continue;
						}
					}
					break;
				}

				for (int h = 0; h < divisorLen; h++)
				{
					dividendPart[divisorLen - h - 1] = remainderDat[pos - h];
				}

				BigInteger dTemp = new BigInteger(dividendPart);
				BigInteger rTemp = rightSide * (long)qHat;
				while (rTemp > dTemp)
				{
					qHat--;
					rTemp -= rightSide;
				}

				rTemp = dTemp - rTemp;
				for (int h = 0; h < divisorLen; h++)
				{
					remainderDat[pos - h] = rTemp.m_digits[rightSide.m_digits.DataUsed - h];
				}

				result[resultPos++] = (DType)qHat;
			}

			Array.Reverse(result, 0, resultPos);
			quotient = new BigInteger(new DigitsArray(result));

			int n = DigitsArray.ShiftRight(remainderDat, d);
			DigitsArray rDA = new DigitsArray(n, n);
			rDA.CopyFrom(remainderDat, 0, 0, rDA.DataUsed);
			remainder = new BigInteger(rDA);
		}
Exemplo n.º 4
0
		/// <summary>
		/// Substracts two BigIntegers and returns a new BigInteger that represents the sum.
		/// </summary>
		/// <param name="leftSide">A BigInteger</param>
		/// <param name="rightSide">A BigInteger</param>
		/// <returns>The BigInteger result of substracting <paramref name="leftSide" /> and <paramref name="rightSide" />.</returns>
		public static BigInteger operator - (BigInteger leftSide, BigInteger rightSide)
		{
			int size = System.Math.Max(leftSide.m_digits.DataUsed, rightSide.m_digits.DataUsed) + 1;
			DigitsArray da = new DigitsArray(size);
			
			long carry = 0;
			for (int i = 0; i < da.Count; i++)
			{
				long diff = (long)leftSide.m_digits[i] - (long)rightSide.m_digits[i] - carry;
				da[i] = (DType)(diff & DigitsArray.AllBits);
				da.DataUsed++;
				carry = ((diff < 0) ? 1 : 0);
			}
			return new BigInteger(da);
		}
Exemplo n.º 5
0
		/// <summary>
		/// Negates the BigInteger, that is, if the BigInteger is negative return a positive BigInteger, and if the
		/// BigInteger is negative return the postive.
		/// </summary>
		/// <param name="leftSide">A BigInteger operand.</param>
		/// <returns>The value of the <paramref name="this" /> negated.</returns>
		public static BigInteger operator - (BigInteger leftSide)
		{
			if (object.ReferenceEquals(leftSide, null))
			{
				throw new ArgumentNullException("leftSide");
			}

			if (leftSide.IsZero)
			{
				return new BigInteger(0);
			}

			DigitsArray da = new DigitsArray(leftSide.m_digits.DataUsed + 1, leftSide.m_digits.DataUsed + 1);

			for (int i = 0; i < da.Count; i++)
			{
				da[i] = (DType)(~(leftSide.m_digits[i]));
			}

			// add one to result (1's complement + 1)
			bool carry = true;
			int index = 0;
			while (carry && index < da.Count)
			{
				long val = (long)da[index] + 1;
				da[index] = (DType)(val & DigitsArray.AllBits);
				carry = ((val >> DigitsArray.DataSizeBits) > 0);
				index++;
			}

			return new BigInteger(da);
		}
Exemplo n.º 6
0
		/// <summary>
		/// Copy constructor, doesn't copy the digits parameter, assumes <code>this</code> owns the DigitsArray.
		/// </summary>
		/// <remarks>The <paramef name="digits" /> parameter is saved and reset.</remarks>
		/// <param name="digits"></param>
		private BigInteger(DigitsArray digits)
		{
			digits.ResetDataUsed();
			this.m_digits = digits;
		}
Exemplo n.º 7
0
		/// <summary>
		/// Adds two BigIntegers and returns a new BigInteger that represents the sum.
		/// </summary>
		/// <param name="leftSide">A BigInteger</param>
		/// <param name="rightSide">A BigInteger</param>
		/// <returns>The BigInteger result of adding <paramref name="leftSide" /> and <paramref name="rightSide" />.</returns>
		public static BigInteger operator + (BigInteger leftSide, BigInteger rightSide)
		{
			int size = System.Math.Max(leftSide.m_digits.DataUsed, rightSide.m_digits.DataUsed);
			DigitsArray da = new DigitsArray(size + 1);

			long carry = 0;
			for (int i = 0; i < da.Count; i++)
			{
				long sum = (long)leftSide.m_digits[i] + (long)rightSide.m_digits[i] + carry;
				carry  = (long)(sum >> DigitsArray.DataSizeBits);
				da[i] = (DType)(sum & DigitsArray.AllBits);
			}

			return new BigInteger(da);
		}
Exemplo n.º 8
0
		private void ConstructFrom(byte[] array, int offset, int length)
		{
			if (array == null)
			{
				throw new ArgumentNullException("array");
			}
			if (offset > array.Length || length > array.Length)
			{
				throw new ArgumentOutOfRangeException("offset");
			}
			if (length > array.Length || (offset + length) > array.Length)
			{
				throw new ArgumentOutOfRangeException("length");
			}

			int estSize = length / 4;
			int leftOver = length & 3;
			if (leftOver != 0)
			{
				++estSize;
			}

			m_digits = new DigitsArray(estSize + 1, 0); // alloc one extra since we can't init -'s from here.

			for (int i = offset + length - 1, j = 0; (i - offset) >= 3; i -= 4, j++)
			{
				m_digits[j] = (DType)((array[i - 3] << 24) + (array[i - 2] << 16) + (array[i - 1] <<  8) + array[i]);
				m_digits.DataUsed++;
			}
			
            DType accumulator = 0;
            for (int i = leftOver; i > 0; i--)
            {
                DType digit = array[offset + leftOver - i];
                digit = (digit << ((i - 1) * 8));
                accumulator |= digit;
            }
            m_digits[m_digits.DataUsed] = accumulator;

            m_digits.ResetDataUsed();
		}
Exemplo n.º 9
0
		private void Construct(string digits, int radix)
		{
			if (digits == null)
			{
				throw new ArgumentNullException("digits");
			}

			BigInteger multiplier = new BigInteger(1);
			BigInteger result = new BigInteger();
			digits = digits.ToUpper(System.Globalization.CultureInfo.CurrentCulture).Trim();
			
			int nDigits = (digits[0] == '-' ? 1 : 0);

			for (int idx = digits.Length - 1; idx >= nDigits ; idx--)
			{
				int d = (int)digits[idx];
				if (d >= '0' && d <= '9')
				{
					d -= '0';
				}
				else if (d >= 'A' && d <= 'Z')
				{
					d = (d - 'A') + 10;
				}
				else
				{
					throw new ArgumentOutOfRangeException("digits");
				}

				if (d >= radix)
				{
					throw new ArgumentOutOfRangeException("digits");
				}
				result += (multiplier * d);
				multiplier *= radix;
			}

			if (digits[0] == '-')
			{
				result = -result;
			}

			this.m_digits = result.m_digits;
		}
Exemplo n.º 10
0
		/// <summary>
		/// Create a BigInteger with an integer value of 0.
		/// </summary>
		public BigInteger()
		{
			m_digits = new DigitsArray(1, 1);
		}
Exemplo n.º 11
0
		/// <summary>
		/// Creates a BigInteger with the value of the operand. Can never be negative.
		/// </summary>
		/// <param name="number">A unsigned long.</param>
		public BigInteger(ulong number)
		{
			m_digits = new DigitsArray((8 / DigitsArray.DataSizeOf) + 1, 0);
			while (number != 0 && m_digits.DataUsed < m_digits.Count)
			{
				m_digits[m_digits.DataUsed] = (DType)(number & DigitsArray.AllBits);
				number >>= DigitsArray.DataSizeBits;
				m_digits.DataUsed++;
			}
			m_digits.ResetDataUsed();
		}
Exemplo n.º 12
0
 internal DigitsArray(DigitsArray copyFrom)
 {
     Allocate(copyFrom.Count, copyFrom.DataUsed);
     Array.Copy(copyFrom.m_data, 0, m_data, 0, copyFrom.Count);
 }
Exemplo n.º 13
0
		public static BigInteger operator >> (BigInteger leftSide, int shiftCount)
		{
			if (leftSide == null)
			{
				throw new ArgumentNullException("leftSide");
			}

			DigitsArray da = new DigitsArray(leftSide.m_digits);
			da.DataUsed = da.ShiftRight(shiftCount);

			if (leftSide.IsNegative)
			{
				for (int i = da.Count - 1; i >= da.DataUsed; i--)
				{
					da[i] = DigitsArray.AllBits;
				}

				DType mask = DigitsArray.HiBitSet;
				for (int i = 0; i < DigitsArray.DataSizeBits; i++)
				{
					if ((da[da.DataUsed - 1] & mask) == DigitsArray.HiBitSet)
					{
						break;
					}
					da[da.DataUsed - 1] |= mask;
					mask >>= 1;
				}
				da.DataUsed = da.Count;
			}

			return new BigInteger(da);
		}
Exemplo n.º 14
0
		public static BigInteger operator << (BigInteger leftSide, int shiftCount)
		{
			if (leftSide == null)
			{
				throw new ArgumentNullException("leftSide");
			}
			
			DigitsArray da = new DigitsArray(leftSide.m_digits);
			da.DataUsed = da.ShiftLeftWithoutOverflow(shiftCount);

			return new BigInteger(da);
		}
Exemplo n.º 15
0
		public static BigInteger operator ~ (BigInteger leftSide)
		{
			DigitsArray da = new DigitsArray(leftSide.m_digits.Count);
			for(int idx = 0; idx < da.Count; idx++)
			{
				da[idx] = (DType)(~(leftSide.m_digits[idx]));
			}

			return new BigInteger(da);
		}
Exemplo n.º 16
0
		public static BigInteger operator ^ (BigInteger leftSide, BigInteger rightSide)
		{
			int len = System.Math.Max(leftSide.m_digits.DataUsed, rightSide.m_digits.DataUsed);
			DigitsArray da = new DigitsArray(len, len);
			for (int idx = 0; idx < len; idx++)
			{
				da[idx] = (DType)(leftSide.m_digits[idx] ^ rightSide.m_digits[idx]);
			}
			return new BigInteger(da);
		}