85 lines
2.4 KiB
C#
85 lines
2.4 KiB
C#
// 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;
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using System.Runtime.CompilerServices;
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#if NETSTANDARD2_1_OR_GREATER
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using System.Runtime.InteropServices;
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#endif
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namespace CommunityToolkit.HighPerformance.Streams;
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/// <summary>
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/// An <see cref="ISpanOwner"/> implementation wrapping an array.
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/// </summary>
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internal readonly struct ArrayOwner : ISpanOwner
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{
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/// <summary>
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/// The wrapped <see cref="byte"/> array.
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/// </summary>
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private readonly byte[] array;
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/// <summary>
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/// The starting offset within <see cref="array"/>.
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/// </summary>
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private readonly int offset;
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/// <summary>
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/// The usable length within <see cref="array"/>.
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/// </summary>
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private readonly int length;
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/// <summary>
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/// Initializes a new instance of the <see cref="ArrayOwner"/> struct.
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/// </summary>
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/// <param name="array">The wrapped <see cref="byte"/> array.</param>
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/// <param name="offset">The starting offset within <paramref name="array"/>.</param>
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/// <param name="length">The usable length within <paramref name="array"/>.</param>
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public ArrayOwner(byte[] array, int offset, int length)
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{
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this.array = array;
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this.offset = offset;
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this.length = length;
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}
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/// <summary>
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/// Gets an empty <see cref="ArrayOwner"/> instance.
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/// </summary>
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public static ArrayOwner Empty
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => new(Array.Empty<byte>(), 0, 0);
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}
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/// <inheritdoc/>
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public int Length
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => this.length;
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}
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/// <inheritdoc/>
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public Span<byte> Span
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get
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{
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#if NETSTANDARD2_1_OR_GREATER
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ref byte r0 = ref this.array.DangerousGetReferenceAt(this.offset);
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return MemoryMarshal.CreateSpan(ref r0, this.length);
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#else
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return this.array.AsSpan(this.offset, this.length);
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#endif
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}
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}
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/// <inheritdoc/>
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public Memory<byte> Memory
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => this.array.AsMemory(this.offset, this.length);
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}
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}
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