50 lines
1.9 KiB
C#
50 lines
1.9 KiB
C#
using System;
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namespace UnityEngine.XR.ARSubsystems
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{
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/// <summary>
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/// Utility for dealing with <c>Guid</c>s.
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/// </summary>
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public static class GuidUtil
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{
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/// <summary>
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/// Reconstructs a [Guid](xref:System.Guid) from two <c>ulong</c>s representing the low and high bytes.
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/// Use [UnityEditor.XR.ARSubsystems.GuidExtensions.Decompose](xref:UnityEditor.XR.ARSubsystems.GuidExtensions.Decompose(System.Guid,System.UInt64@,System.UInt64@))
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/// to decompose the guid into its low and high components.
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/// </summary>
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/// <param name="low">The low 8 bytes of the guid</param>
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/// <param name="high">The high 8 bytes of the guid.</param>
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/// <returns>The Guid composed of <paramref name="low"/> and <paramref name="high"/>.</returns>
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public static Guid Compose(ulong low, ulong high)
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{
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return new Guid(
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(uint)((low & 0x00000000ffffffff) >> 0),
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(ushort)((low & 0x0000ffff00000000) >> 32),
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(ushort)((low & 0xffff000000000000) >> 48),
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(byte)((high & 0x00000000000000ff) >> 0),
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(byte)((high & 0x000000000000ff00) >> 8),
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(byte)((high & 0x0000000000ff0000) >> 16),
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(byte)((high & 0x00000000ff000000) >> 24),
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(byte)((high & 0x000000ff00000000) >> 32),
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(byte)((high & 0x0000ff0000000000) >> 40),
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(byte)((high & 0x00ff000000000000) >> 48),
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(byte)((high & 0xff00000000000000) >> 56));
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}
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struct GuidParts
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{
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public ulong low;
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public ulong high;
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}
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internal static (ulong low, ulong high) Decompose(Guid guid)
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{
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unsafe
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{
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var parts = *(GuidParts*)&guid;
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return (parts.low, parts.high);
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}
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}
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}
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}
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