179 lines
5.1 KiB
C#
179 lines
5.1 KiB
C#
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using System;
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using System.Runtime.ConstrainedExecution;
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using System.Security.Cryptography;
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using System.Text;
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namespace CYQ.Data.Tool
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{
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///// <summary>
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///// Fowler-Noll-Vo hash, variant 1, 32-bit version.
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///// http://www.isthe.com/chongo/tech/comp/fnv/
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///// </summary>
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//internal class FNV1_32 : HashAlgorithm
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//{
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// private static readonly uint FNV_prime = 16777619;
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// private static readonly uint offset_basis = 2166136261;
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// protected uint hash;
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// public FNV1_32()
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// {
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// HashSizeValue = 32;
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// }
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// public override void Initialize()
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// {
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// hash = offset_basis;
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// }
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// protected override void HashCore(byte[] array, int ibStart, int cbSize)
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// {
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// int length = ibStart + cbSize;
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// for (int i = ibStart; i < length; i++)
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// {
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// hash = (hash * FNV_prime) ^ array[i];
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// }
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// }
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// protected override byte[] HashFinal()
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// {
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// return BitConverter.GetBytes(hash);
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// }
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//}
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///// <summary>
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///// Fowler-Noll-Vo hash, variant 1a, 32-bit version.
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///// http://www.isthe.com/chongo/tech/comp/fnv/
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///// </summary>
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//internal class FNV1a_32 : HashAlgorithm
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//{
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// private static readonly uint FNV_prime = 16777619;
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// private static readonly uint offset_basis = 2166136261;
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// protected uint hash;
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// public FNV1a_32()
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// {
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// HashSizeValue = 32;
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// }
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// public override void Initialize()
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// {
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// hash = offset_basis;
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// }
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// protected override void HashCore(byte[] array, int ibStart, int cbSize)
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// {
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// int length = ibStart + cbSize;
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// for (int i = ibStart; i < length; i++)
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// {
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// hash = (hash ^ array[i]) * FNV_prime;
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// }
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// }
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// protected override byte[] HashFinal()
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// {
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// return BitConverter.GetBytes(hash);
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// }
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//}
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///// <summary>
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///// Modified Fowler-Noll-Vo hash, 32-bit version.
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///// http://home.comcast.net/~bretm/hash/6.html
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//// <20><><EFBFBD><EFBFBD><EFBFBD>ӻ<EFBFBD><D3BB><EFBFBD><EFBFBD>㷨<EFBFBD><E3B7A8>ͬһ<CDAC><D2BB>key<65>ڲ<EFBFBD>ͬ<EFBFBD><CDAC><EFBFBD>߳<EFBFBD><DFB3>£<EFBFBD><C2A3><EFBFBD>Ȼż<C8BB><C5BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC>hash<73><68>
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///// </summary>
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//internal class ModifiedFNV1_32 : FNV1_32
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//{
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// protected override byte[] HashFinal()
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// {
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// hash += hash << 13;
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// hash ^= hash >> 7;
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// hash += hash << 3;
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// hash ^= hash >> 17;
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// hash += hash << 5;
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// return BitConverter.GetBytes(hash);
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// }
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//}
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/// <summary>
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/// <20><><EFBFBD><EFBFBD>ΨһHash<73><68>
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/// </summary>
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internal class HashCreator
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{
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/// <summary>
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/// <20><><EFBFBD><EFBFBD>HashKey<65><79><EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD>ʵ<EFBFBD>һЩ<D2BB><D0A9>
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/// </summary>
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/// <returns></returns>
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public static string CreateKey(string key)
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{
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if (string.IsNullOrEmpty(key))
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{
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return "K" + CreateCode(key);
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}
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return "K" + (int)key[0] + CreateCode(key) + key.Length;
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}
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//private static readonly FNV1a_32 fnv1 = new FNV1a_32();//<2F><><EFBFBD>ܽ<EFBFBD><DCBD><EFBFBD>Ӱ<EFBFBD>죬<EFBFBD><ECA3AC><EFBFBD><EFBFBD>cpuӰ<75>죬<EFBFBD><ECA3AC><EFBFBD>Բ<EFBFBD><D4B2><EFBFBD><EFBFBD>á<EFBFBD>
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/// <summary>
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/// <20><><EFBFBD><EFBFBD>HashCode<64><65><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD>ʡ<EFBFBD>
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/// </summary>
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/// <param name="key"></param>
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/// <returns></returns>
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public static uint CreateCode(string key)
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{
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if (key == null)
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{
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return uint.MinValue;
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}
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else if (key.Trim() == "")
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{
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return uint.MaxValue;
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}
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return GetHashCode(key);
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//return BitConverter.ToUInt32(fnv1.ComputeHash(Encoding.Unicode.GetBytes(key)), 0);
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}
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/// <summary>
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/// ȡ<><C8A1>java<76><61><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>hash<73>㷨(<28><>һ<EFBFBD><D2BB><EFBFBD>ظ<EFBFBD><D8B8>ĸ<EFBFBD><C4B8><EFBFBD>)<29><>
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/// </summary>
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/// <param name="value"></param>
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/// <returns></returns>
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private static uint GetHashCode(string value)
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{
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uint h = 0;
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foreach (char c in value)
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{
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h = 31 * h + c;
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}
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return h;
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}
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//[System.Security.SecuritySafeCritical] // auto-generated
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//[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
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//private static uint GetHashCode(string key)
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//{
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// unsafe
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// {
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// fixed (char* src = key)
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// {
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// int hash1 = 5381;
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// int hash2 = hash1;
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// int c;
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// char* s = src;
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// while ((c = s[0]) != 0)
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// {
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// hash1 = ((hash1 << 5) + hash1) ^ c;
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// c = s[1];
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// if (c == 0)
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// break;
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// hash2 = ((hash2 << 5) + hash2) ^ c;
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// s += 2;
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// }
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// return (uint)((long)(hash1 + hash2 * 1566083941) + int.MaxValue);
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// }
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// }
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//}
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}
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}
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