58 lines
1.8 KiB
C#
58 lines
1.8 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="CompatibleComparer.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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/*
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* This class is used to create hashcodes that are Everett Compatible.
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*
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* Copyright (c) 2004 Microsoft Corporation
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*/
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namespace System.Collections.Specialized {
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using Microsoft.Win32;
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using System.Collections;
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using System.Runtime.Serialization;
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using System.Globalization;
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internal class BackCompatibleStringComparer : IEqualityComparer {
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static internal IEqualityComparer Default = new BackCompatibleStringComparer();
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internal BackCompatibleStringComparer() {
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}
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//This comes from VS# 434837 and is specifically written to get backcompat
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public static int GetHashCode(string obj) {
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unsafe {
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fixed (char* src = obj) {
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int hash = 5381;
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int c;
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char* szStr = src;
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while ((c = *szStr) != 0) {
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hash = ((hash << 5) + hash) ^ c;
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++szStr;
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}
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return hash;
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}
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}
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}
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bool IEqualityComparer.Equals(Object a, Object b) {
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return Object.Equals(a, b);
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}
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public virtual int GetHashCode(Object o) {
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String obj = o as string;
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if (obj == null) {
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return o.GetHashCode();
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}
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return BackCompatibleStringComparer.GetHashCode(obj);
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}
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}
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}
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