C#根据url生成唯一的key

根据url生成唯一的idkey,记录并分享:

    public class UrlToUniqueKey
    {
        private static Hashtable generators = new Hashtable();
        public static long[,] polynomials = new long[, ]
    {
      {
        0L,
        0L
      },
      {
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      },
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        -2043424698022887424L,
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      },
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        -4436928417950760960L,
        -8365357674703716352L
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      {
        -5903553087924551680L,
        -232537924545363968L
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      {
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        -2341229233224585216L,
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      {
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      {
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      {
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      {
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      {
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      {
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      {
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      },
      {
        -2935493925047926053L,
        -7378668602973054136L
      }
    };
        public static UrlToUniqueKey std64 = UrlToUniqueKey.make(UrlToUniqueKey.polynomials[, ], );
        public static UrlToUniqueKey std32 = UrlToUniqueKey.make(UrlToUniqueKey.polynomials[, ], );
        public static UrlToUniqueKey std40 = UrlToUniqueKey.make(UrlToUniqueKey.polynomials[, ], );
        public static UrlToUniqueKey std24 = UrlToUniqueKey.make(UrlToUniqueKey.polynomials[, ], );
        private long zero = 0L;
        private long one = long.MinValue;
        public long empty;
        public int degree;
        public long polynomial;
        private long[,] ByteModTable;

        private UrlToUniqueKey(long polynomial, int degree)
        {
            this.degree = degree;
            this.polynomial = polynomial;
            this.ByteModTable = new long[, ];
            long[] numArray = new long[];
            long num1 = long.MinValue;
            long num2 = this.rightMove(long.MinValue, degree - );
            for (int index = ; index < ; ++index)
            {
                numArray[index] = num1;
                bool flag = (num1 & num2) != 0L;
                num1 = this.rightMove(num1, );
                if (flag)
                    num1 ^= polynomial;
            }
            this.empty = numArray[];
            for (int index1 = ; index1 < ; ++index1)
            {
                for (int index2 = ; index2 < ; ++index2)
                {
                    long num3 = 0L;
                    for (int index3 = ; index3 < ; ++index3)
                    {
                        if ((index2 &  << index3) != )
                            num3 ^= numArray[(int)sbyte.MaxValue - index1 *  - index3];
                    }
                    this.ByteModTable[index1, index2] = num3;
                }
            }
        }

        public static UrlToUniqueKey make(long polynomial, int degree)
        {
            long num = polynomial;
            UrlToUniqueKey heritrix = (UrlToUniqueKey)UrlToUniqueKey.generators[(object)];
            if (heritrix == null)
            {
                heritrix = new UrlToUniqueKey(polynomial, degree);
                UrlToUniqueKey.generators.Add((object)num, (object)heritrix);
            }
            return heritrix;
        }

        private long rightMove(long value, int pos)
        {
            if (pos != )
            {
                long num = long.MaxValue;
                value >>= ;
                value &= num;
                value >>= pos - ;
            }
            return value;
        }

        public static long long_rightMove(long value, int pos)
        {
            if (pos != )
            {
                long num = long.MaxValue;
                value >>= ;
                value &= num;
                value >>= pos - ;
            }
            return value;
        }

        private int int_rightMove(int value, int pos)
        {
            if (pos != )
            {
                int num = int.MaxValue;
                value >>= ;
                value &= num;
                value >>= pos - ;
            }
            return value;
        }

        public long reduce(long fp)
        {
            int num1 =  - this.degree / ;
            long num2 = num1 ==  ? 0L : fp & -1L <<  * num1;
            long num3 = 0L;
            for (int index = ; index < num1; ++index)
            {
                num3 ^= this.ByteModTable[ + index, (int)fp & (int)byte.MaxValue];
                fp = this.rightMove(fp, );
            }
            return num2 ^ num3;
        }

        public long extend_byte(long f, int v)
        {
            f ^= (long)((int)byte.MaxValue & v);
            int num = (int)f;
            return this.rightMove(f, ) ^ this.ByteModTable[, num & (int)byte.MaxValue];
        }

        public long extend_char(long f, int v)
        {
            f ^= (long)((int)ushort.MaxValue & v);
            int num = (int)f;
            return this.rightMove(f, ) ^ this.ByteModTable[, num & (int)byte.MaxValue] ^ this.ByteModTable[, this.int_rightMove(num, ) & (int)byte.MaxValue];
        }

        public long extend_int(long f, int v)
        {
            f ^= (long)uint.MaxValue & (long)v;
            int num1 = (int)f;
            long num2 = this.rightMove(f, ) ^ this.ByteModTable[, num1 & (int)byte.MaxValue];
            int num3 = this.int_rightMove(num1, );
            long num4 = num2 ^ this.ByteModTable[, num3 & (int)byte.MaxValue];
            int num5 = this.int_rightMove(num3, );
            return num4 ^ this.ByteModTable[, num5 & (int)byte.MaxValue] ^ this.ByteModTable[, this.int_rightMove(num5, ) & (int)byte.MaxValue];
        }

        public long extend_long(long f, long v)
        {
            f ^= v;
            long num1 = this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num2 = num1 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num3 = num2 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num4 = num3 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num5 = num4 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num6 = num5 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            long num7 = num6 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
            f = this.rightMove(f, );
            return num7 ^ this.ByteModTable[, (int)(f & (long)byte.MaxValue)];
        }

        public long fp(byte[] buf, int start, int n)
        {
            return this.extend(this.empty, buf, start, n);
        }

        public long fp(char[] buf, int start, int n)
        {
            return this.extend(this.empty, buf, start, n);
        }

        public long fp(string s)
        {
            return this.extend(this.empty, s);
        }

        public long fp(int[] buf, int start, int n)
        {
            return this.extend(this.empty, buf, start, n);
        }

        public long fp(long[] buf, int start, int n)
        {
            return this.extend(this.empty, buf, start, n);
        }

        public long fp8(string s)
        {
            return this.extend8(this.empty, s);
        }

        public long fp8(char[] buf, int start, int n)
        {
            return this.extend8(this.empty, buf, start, n);
        }

        public long extend(long f, byte v)
        {
            return this.reduce(this.extend_byte(f, (int)v));
        }

        public long extend(long f, char v)
        {
            return this.reduce(this.extend_char(f, (int)v));
        }

        public long extend(long f, int v)
        {
            return this.reduce(this.extend_int(f, v));
        }

        public long extend(long f, long v)
        {
            return this.reduce(this.extend_long(f, v));
        }

        public long extend(long f, byte[] buf, int start, int n)
        {
            for (int index = ; index < n; ++index)
                f = this.extend_byte(f, (int)buf[start + index]);
            return this.reduce(f);
        }

        public long extend(long f, char[] buf, int start, int n)
        {
            for (int index = ; index < n; ++index)
                f = this.extend_char(f, (int)buf[start + index]);
            return this.reduce(f);
        }

        public long extend(long f, string s)
        {
            int length = s.Length;
            for (int index = ; index < length; ++index)
            {
                int v = (int)s[index];
                f = this.extend_char(f, v);
            }
            return this.reduce(f);
        }

        public long extend(long f, int[] buf, int start, int n)
        {
            for (int index = ; index < n; ++index)
                f = this.extend_int(f, buf[start + index]);
            return this.reduce(f);
        }

        public long extend(long f, long[] buf, int start, int n)
        {
            for (int index = ; index < n; ++index)
                f = this.extend_long(f, buf[start + index]);
            return this.reduce(f);
        }

        public long extend8(long f, string s)
        {
            int length = s.Length;
            for (int index = ; index < length; ++index)
            {
                int v = (int)s[index];
                f = this.extend_byte(f, v);
            }
            return this.reduce(f);
        }

        public long extend8(long f, char[] buf, int start, int n)
        {
            for (int index = ; index < n; ++index)
                f = this.extend_byte(f, (int)buf[start + index]);
            return this.reduce(f);
        }

        public static ulong createUrlkey(string url)
        {
            int length = url.IndexOf("://");
            if (length > )
                length = url.IndexOf('/', length + "://".Length);
            string s = length == - ? url : url.Substring(, length);
            return Convert.ToUInt64(Convert.ToString(UrlToUniqueKey.std32.fp(s) | UrlToUniqueKey.long_rightMove(UrlToUniqueKey.std40.fp(url), ), ).PadLeft(, ''), );
        }
        /// <summary>
        /// 根据url生成唯一id
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static long createUrlToLong(string url)
        {
            int length = url.IndexOf("://");
            if (length > )
                length = url.IndexOf('/', length + "://".Length);
            string s = length == - ? url : url.Substring(, length);
            return UrlToUniqueKey.std32.fp(s) | UrlToUniqueKey.long_rightMove(UrlToUniqueKey.std40.fp(url), );
        }
    }