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refactor: move FastByteArrayCompare from ChatGui to Util

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goaaats 2022-01-27 01:22:57 +01:00
parent c232befd83
commit a4ce3d0688
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2 changed files with 57 additions and 50 deletions
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52
Dalamud/Utility/Util.cs
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@ -44,6 +44,58 @@ namespace Dalamud.Utility
/// </summary>
public static string AssemblyVersion { get; } = Assembly.GetAssembly(typeof(ChatHandlers)).GetName().Version.ToString();
/// <summary>
/// Check two byte arrays for equality.
/// </summary>
/// <param name="a1">The first byte array.</param>
/// <param name="a2">The second byte array.</param>
/// <returns>Whether or not the byte arrays are equal.</returns>
public static unsafe bool FastByteArrayCompare(byte[]? a1, byte[]? a2)
{
// Copyright (c) 2008-2013 Hafthor Stefansson
// Distributed under the MIT/X11 software license
// Ref: http://www.opensource.org/licenses/mit-license.php.
// https://stackoverflow.com/a/8808245
if (a1 == a2) return true;
if (a1 == null || a2 == null || a1.Length != a2.Length)
return false;
fixed (byte* p1 = a1, p2 = a2)
{
byte* x1 = p1, x2 = p2;
var l = a1.Length;
for (var i = 0; i < l / 8; i++, x1 += 8, x2 += 8)
{
if (*((long*)x1) != *((long*)x2))
return false;
}
if ((l & 4) != 0)
{
if (*((int*)x1) != *((int*)x2))
return false;
x1 += 4;
x2 += 4;
}
if ((l & 2) != 0)
{
if (*((short*)x1) != *((short*)x2))
return false;
x1 += 2;
x2 += 2;
}
if ((l & 1) != 0)
{
if (*((byte*)x1) != *((byte*)x2))
return false;
}
return true;
}
}
/// <summary>
/// Gets the git hash value from the assembly
/// or null if it cannot be found.