namespace JXCMS.Core.Encrypt
{
    public class SupportClass
    {
        /// <summary>
        /// Performs an unsigned bitwise right shift with the specified number
        /// </summary>
        ///<param name="number">Number to operate on
        ///<param name="bits">Ammount of bits to shift
        /// <returns>The resulting number from the shift operation</returns>
        public static int URShift(int number, int bits)
        {
            if (number >= 0)
                return number >> bits;
            else
                return (number >> bits) + (2 << ~bits);
        }

        /// <summary>
        /// Performs an unsigned bitwise right shift with the specified number
        /// </summary>
        ///<param name="number">Number to operate on
        ///<param name="bits">Ammount of bits to shift
        /// <returns>The resulting number from the shift operation</returns>
        public static int URShift(int number, long bits)
        {
            return URShift(number, (int)bits);
        }

        /// <summary>
        /// Performs an unsigned bitwise right shift with the specified number
        /// </summary>
        ///<param name="number">Number to operate on
        ///<param name="bits">Ammount of bits to shift
        /// <returns>The resulting number from the shift operation</returns>
        public static long URShift(long number, int bits)
        {
            if (number >= 0)
                return number >> bits;
            else
                return (number >> bits) + (2L << ~bits);
        }

        /// <summary>
        /// Performs an unsigned bitwise right shift with the specified number
        /// </summary>
        ///<param name="number">Number to operate on
        ///<param name="bits">Ammount of bits to shift
        /// <returns>The resulting number from the shift operation</returns>
        public static long URShift(long number, long bits)
        {
            return URShift(number, (int)bits);
        }
    }
}