Add System.HashCode polyfill
This commit is contained in:
Sergio Pedri
Родитель
359615a5ba
Коммит
85d2c0f166
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@ -0,0 +1,497 @@
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Security.Cryptography;
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#pragma warning disable CS0809
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namespace System;
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/// <summary>
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/// A polyfill type that mirrors some methods from <see cref="HashCode"/> on .NET 6.
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/// </summary>
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internal struct HashCode
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{
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private const uint Prime1 = 2654435761U;
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private const uint Prime2 = 2246822519U;
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private const uint Prime3 = 3266489917U;
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private const uint Prime4 = 668265263U;
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private const uint Prime5 = 374761393U;
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private static readonly uint seed = GenerateGlobalSeed();
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private uint v1, v2, v3, v4;
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private uint queue1, queue2, queue3;
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private uint length;
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/// <summary>
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/// Initializes the default seed.
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/// </summary>
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/// <returns>A random seed.</returns>
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private static unsafe uint GenerateGlobalSeed()
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{
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byte[] bytes = new byte[4];
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RandomNumberGenerator.Create().GetBytes(bytes);
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return BitConverter.ToUInt32(bytes, 0);
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}
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/// <summary>
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/// Combines a value into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the value to combine into the hash code.</typeparam>
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/// <param name="value">The value to combine into the hash code.</param>
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/// <returns>The hash code that represents the value.</returns>
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public static int Combine<T1>(T1 value)
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{
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uint hc1 = (uint)(value?.GetHashCode() ?? 0);
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uint hash = MixEmptyState();
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hash += 4;
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hash = QueueRound(hash, hc1);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines two values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2>(T1 value1, T2 value2)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hash = MixEmptyState();
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hash += 8;
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hash = QueueRound(hash, hc1);
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hash = QueueRound(hash, hc2);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines three values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3>(T1 value1, T2 value2, T3 value3)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hash = MixEmptyState();
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hash += 12;
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hash = QueueRound(hash, hc1);
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hash = QueueRound(hash, hc2);
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hash = QueueRound(hash, hc3);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines four values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <typeparam name="T4">The type of the fourth value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <param name="value4">The fourth value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3, T4>(T1 value1, T2 value2, T3 value3, T4 value4)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hc4 = (uint)(value4?.GetHashCode() ?? 0);
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Initialize(out uint v1, out uint v2, out uint v3, out uint v4);
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v1 = Round(v1, hc1);
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v2 = Round(v2, hc2);
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v3 = Round(v3, hc3);
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v4 = Round(v4, hc4);
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uint hash = MixState(v1, v2, v3, v4);
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hash += 16;
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines five values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <typeparam name="T4">The type of the fourth value to combine into the hash code.</typeparam>
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/// <typeparam name="T5">The type of the fifth value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <param name="value4">The fourth value to combine into the hash code.</param>
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/// <param name="value5">The fifth value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3, T4, T5>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hc4 = (uint)(value4?.GetHashCode() ?? 0);
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uint hc5 = (uint)(value5?.GetHashCode() ?? 0);
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Initialize(out uint v1, out uint v2, out uint v3, out uint v4);
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v1 = Round(v1, hc1);
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v2 = Round(v2, hc2);
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v3 = Round(v3, hc3);
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v4 = Round(v4, hc4);
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uint hash = MixState(v1, v2, v3, v4);
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hash += 20;
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hash = QueueRound(hash, hc5);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines six values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <typeparam name="T4">The type of the fourth value to combine into the hash code.</typeparam>
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/// <typeparam name="T5">The type of the fifth value to combine into the hash code.</typeparam>
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/// <typeparam name="T6">The type of the sixth value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <param name="value4">The fourth value to combine into the hash code.</param>
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/// <param name="value5">The fifth value to combine into the hash code.</param>
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/// <param name="value6">The sixth value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3, T4, T5, T6>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hc4 = (uint)(value4?.GetHashCode() ?? 0);
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uint hc5 = (uint)(value5?.GetHashCode() ?? 0);
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uint hc6 = (uint)(value6?.GetHashCode() ?? 0);
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Initialize(out uint v1, out uint v2, out uint v3, out uint v4);
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v1 = Round(v1, hc1);
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v2 = Round(v2, hc2);
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v3 = Round(v3, hc3);
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v4 = Round(v4, hc4);
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uint hash = MixState(v1, v2, v3, v4);
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hash += 24;
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hash = QueueRound(hash, hc5);
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hash = QueueRound(hash, hc6);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines seven values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <typeparam name="T4">The type of the fourth value to combine into the hash code.</typeparam>
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/// <typeparam name="T5">The type of the fifth value to combine into the hash code.</typeparam>
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/// <typeparam name="T6">The type of the sixth value to combine into the hash code.</typeparam>
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/// <typeparam name="T7">The type of the seventh value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <param name="value4">The fourth value to combine into the hash code.</param>
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/// <param name="value5">The fifth value to combine into the hash code.</param>
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/// <param name="value6">The sixth value to combine into the hash code.</param>
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/// <param name="value7">The seventh value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3, T4, T5, T6, T7>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6, T7 value7)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hc4 = (uint)(value4?.GetHashCode() ?? 0);
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uint hc5 = (uint)(value5?.GetHashCode() ?? 0);
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uint hc6 = (uint)(value6?.GetHashCode() ?? 0);
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uint hc7 = (uint)(value7?.GetHashCode() ?? 0);
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Initialize(out uint v1, out uint v2, out uint v3, out uint v4);
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v1 = Round(v1, hc1);
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v2 = Round(v2, hc2);
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v3 = Round(v3, hc3);
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v4 = Round(v4, hc4);
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uint hash = MixState(v1, v2, v3, v4);
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hash += 28;
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hash = QueueRound(hash, hc5);
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hash = QueueRound(hash, hc6);
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hash = QueueRound(hash, hc7);
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Combines eight values into a hash code.
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/// </summary>
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/// <typeparam name="T1">The type of the first value to combine into the hash code.</typeparam>
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/// <typeparam name="T2">The type of the second value to combine into the hash code.</typeparam>
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/// <typeparam name="T3">The type of the third value to combine into the hash code.</typeparam>
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/// <typeparam name="T4">The type of the fourth value to combine into the hash code.</typeparam>
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/// <typeparam name="T5">The type of the fifth value to combine into the hash code.</typeparam>
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/// <typeparam name="T6">The type of the sixth value to combine into the hash code.</typeparam>
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/// <typeparam name="T7">The type of the seventh value to combine into the hash code.</typeparam>
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/// <typeparam name="T8">The type of the eigth value to combine into the hash code.</typeparam>
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/// <param name="value1">The first value to combine into the hash code.</param>
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/// <param name="value2">The second value to combine into the hash code.</param>
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/// <param name="value3">The third value to combine into the hash code.</param>
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/// <param name="value4">The fourth value to combine into the hash code.</param>
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/// <param name="value5">The fifth value to combine into the hash code.</param>
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/// <param name="value6">The sixth value to combine into the hash code.</param>
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/// <param name="value7">The seventh value to combine into the hash code.</param>
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/// <param name="value8">The eigth value to combine into the hash code.</param>
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/// <returns>The hash code that represents the values.</returns>
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public static int Combine<T1, T2, T3, T4, T5, T6, T7, T8>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6, T7 value7, T8 value8)
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{
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uint hc1 = (uint)(value1?.GetHashCode() ?? 0);
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uint hc2 = (uint)(value2?.GetHashCode() ?? 0);
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uint hc3 = (uint)(value3?.GetHashCode() ?? 0);
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uint hc4 = (uint)(value4?.GetHashCode() ?? 0);
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uint hc5 = (uint)(value5?.GetHashCode() ?? 0);
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uint hc6 = (uint)(value6?.GetHashCode() ?? 0);
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uint hc7 = (uint)(value7?.GetHashCode() ?? 0);
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uint hc8 = (uint)(value8?.GetHashCode() ?? 0);
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Initialize(out uint v1, out uint v2, out uint v3, out uint v4);
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v1 = Round(v1, hc1);
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v2 = Round(v2, hc2);
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v3 = Round(v3, hc3);
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v4 = Round(v4, hc4);
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v1 = Round(v1, hc5);
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v2 = Round(v2, hc6);
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v3 = Round(v3, hc7);
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v4 = Round(v4, hc8);
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uint hash = MixState(v1, v2, v3, v4);
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hash += 32;
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hash = MixFinal(hash);
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return (int)hash;
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}
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/// <summary>
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/// Adds a single value to the current hash.
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/// </summary>
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/// <typeparam name="T">The type of the value to add into the hash code.</typeparam>
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/// <param name="value">The value to add into the hash code.</param>
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public void Add<T>(T value)
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{
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Add(value?.GetHashCode() ?? 0);
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}
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/// <summary>
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/// Adds a single value to the current hash.
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/// </summary>
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/// <typeparam name="T">The type of the value to add into the hash code.</typeparam>
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/// <param name="value">The value to add into the hash code.</param>
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/// <param name="comparer">The <see cref="IEqualityComparer{T}"/> instance to use.</param>
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public void Add<T>(T value, IEqualityComparer<T>? comparer)
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{
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Add(value is null ? 0 : (comparer?.GetHashCode(value) ?? value.GetHashCode()));
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}
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/// <summary>
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/// Adds a span of bytes to the hash code.
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/// </summary>
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/// <param name="value">The span.</param>
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public void AddBytes(ReadOnlySpan<byte> value)
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{
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ref byte pos = ref MemoryMarshal.GetReference(value);
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ref byte end = ref Unsafe.Add(ref pos, value.Length);
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while ((nint)Unsafe.ByteOffset(ref pos, ref end) >= sizeof(int))
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{
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Add(Unsafe.ReadUnaligned<int>(ref pos));
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pos = ref Unsafe.Add(ref pos, sizeof(int));
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}
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while (Unsafe.IsAddressLessThan(ref pos, ref end))
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{
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Add((int)pos);
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pos = ref Unsafe.Add(ref pos, 1);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static void Initialize(out uint v1, out uint v2, out uint v3, out uint v4)
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{
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v1 = seed + Prime1 + Prime2;
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v2 = seed + Prime2;
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v3 = seed;
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v4 = seed - Prime1;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint Round(uint hash, uint input)
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{
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return RotateLeft(hash + input * Prime2, 13) * Prime1;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint QueueRound(uint hash, uint queuedValue)
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{
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return RotateLeft(hash + queuedValue * Prime3, 17) * Prime4;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint MixState(uint v1, uint v2, uint v3, uint v4)
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{
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return RotateLeft(v1, 1) + RotateLeft(v2, 7) + RotateLeft(v3, 12) + RotateLeft(v4, 18);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint MixEmptyState()
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{
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return seed + Prime5;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint MixFinal(uint hash)
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{
|
||||
hash ^= hash >> 15;
|
||||
hash *= Prime2;
|
||||
hash ^= hash >> 13;
|
||||
hash *= Prime3;
|
||||
hash ^= hash >> 16;
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
private void Add(int value)
|
||||
{
|
||||
uint val = (uint)value;
|
||||
uint previousLength = length++;
|
||||
uint position = previousLength % 4;
|
||||
|
||||
if (position == 0)
|
||||
{
|
||||
queue1 = val;
|
||||
}
|
||||
else if (position == 1)
|
||||
{
|
||||
queue2 = val;
|
||||
}
|
||||
else if (position == 2)
|
||||
{
|
||||
queue3 = val;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (previousLength == 3)
|
||||
{
|
||||
Initialize(out v1, out v2, out v3, out v4);
|
||||
}
|
||||
|
||||
v1 = Round(v1, queue1);
|
||||
v2 = Round(v2, queue2);
|
||||
v3 = Round(v3, queue3);
|
||||
v4 = Round(v4, val);
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Gets the resulting hashcode from the current instance.
|
||||
/// </summary>
|
||||
/// <returns>The resulting hashcode from the current instance.</returns>
|
||||
public int ToHashCode()
|
||||
{
|
||||
uint length = this.length;
|
||||
uint position = length % 4;
|
||||
uint hash = length < 4 ? MixEmptyState() : MixState(v1, v2, v3, v4);
|
||||
|
||||
hash += length * 4;
|
||||
|
||||
if (position > 0)
|
||||
{
|
||||
hash = QueueRound(hash, queue1);
|
||||
|
||||
if (position > 1)
|
||||
{
|
||||
hash = QueueRound(hash, queue2);
|
||||
|
||||
if (position > 2)
|
||||
{
|
||||
hash = QueueRound(hash, queue3);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
hash = MixFinal(hash);
|
||||
|
||||
return (int)hash;
|
||||
}
|
||||
|
||||
/// <inheritdoc/>
|
||||
[Obsolete("HashCode is a mutable struct and should not be compared with other HashCodes. Use ToHashCode to retrieve the computed hash code.", error: true)]
|
||||
[EditorBrowsable(EditorBrowsableState.Never)]
|
||||
public override int GetHashCode() => throw new NotSupportedException();
|
||||
|
||||
/// <inheritdoc/>
|
||||
[Obsolete("HashCode is a mutable struct and should not be compared with other HashCodes.", error: true)]
|
||||
[EditorBrowsable(EditorBrowsableState.Never)]
|
||||
public override bool Equals(object? obj) => throw new NotSupportedException();
|
||||
|
||||
/// <summary>
|
||||
/// Rotates the specified value left by the specified number of bits.
|
||||
/// Similar in behavior to the x86 instruction ROL.
|
||||
/// </summary>
|
||||
/// <param name="value">The value to rotate.</param>
|
||||
/// <param name="offset">The number of bits to rotate by.
|
||||
/// Any value outside the range [0..31] is treated as congruent mod 32.</param>
|
||||
/// <returns>The rotated value.</returns>
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
private static uint RotateLeft(uint value, int offset)
|
||||
{
|
||||
return (value << offset) | (value >> (32 - offset));
|
||||
}
|
||||
}
|
||||
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