46 lines
1.4 KiB
C#
46 lines
1.4 KiB
C#
using System;
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namespace Fantasy.SourceGenerator.Common
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{
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/// <summary>
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/// HashCode 算法帮助类 (Source Generator 版本)
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/// 用于在编译时计算类型哈希值
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/// 注意：此实现必须与 Fantasy.Helper.HashCodeHelper.ComputeHash64 保持完全一致
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/// </summary>
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internal static class HashCodeHelper
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{
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/// <summary>
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/// 使用 MurmurHash3 算法生成一个 long 的值
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/// </summary>
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/// <param name="str">输入字符串</param>
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/// <returns>64位哈希值</returns>
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public static long ComputeHash64(string str)
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{
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const ulong seed = 0xc58f1a7bc58f1a7bUL; // 64-bit seed
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var hash = seed;
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var c1 = 0x87c37b91114253d5UL;
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var c2 = 0x4cf5ad432745937fUL;
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for (var i = 0; i < str.Length; i++)
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{
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var k1 = (ulong)str[i];
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k1 *= c1;
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k1 = (k1 << 31) | (k1 >> (64 - 31));
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k1 *= c2;
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hash ^= k1;
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hash = (hash << 27) | (hash >> (64 - 27));
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hash = hash * 5 + 0x52dce729;
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}
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hash ^= (ulong)str.Length;
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hash ^= hash >> 33;
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hash *= 0xff51afd7ed558ccdUL;
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hash ^= hash >> 33;
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hash *= 0xc4ceb9fe1a85ec53UL;
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hash ^= hash >> 33;
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return (long)hash;
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}
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}
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}
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