113 lines
5.9 KiB
C#
113 lines
5.9 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.IO;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using MemoryStream = CommunityToolkit.HighPerformance.Streams.MemoryStream;
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namespace CommunityToolkit.HighPerformance;
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/// <summary>
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/// Helpers for working with the <see cref="Memory{T}"/> type.
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/// </summary>
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public static class MemoryExtensions
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{
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#if NETSTANDARD2_1_OR_GREATER
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/// <summary>
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/// Returns a <see cref="Memory2D{T}"/> instance wrapping the underlying data for the given <see cref="Memory{T}"/> instance.
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/// </summary>
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/// <typeparam name="T">The type of items in the input <see cref="Memory{T}"/> instance.</typeparam>
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/// <param name="memory">The input <see cref="Memory{T}"/> instance.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <returns>The resulting <see cref="Memory2D{T}"/> instance.</returns>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="memory"/>.
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/// </exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static Memory2D<T> AsMemory2D<T>(this Memory<T> memory, int height, int width)
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{
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return new(memory, height, width);
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}
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/// <summary>
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/// Returns a <see cref="Memory2D{T}"/> instance wrapping the underlying data for the given <see cref="Memory{T}"/> instance.
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/// </summary>
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/// <typeparam name="T">The type of items in the input <see cref="Memory{T}"/> instance.</typeparam>
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/// <param name="memory">The input <see cref="Memory{T}"/> instance.</param>
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/// <param name="offset">The initial offset within <paramref name="memory"/>.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <param name="pitch">The pitch in the resulting 2D area.</param>
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/// <returns>The resulting <see cref="Memory2D{T}"/> instance.</returns>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="memory"/>.
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/// </exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static Memory2D<T> AsMemory2D<T>(this Memory<T> memory, int offset, int height, int width, int pitch)
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{
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return new(memory, offset, height, width, pitch);
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}
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#endif
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/// <summary>
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/// Casts a <see cref="Memory{T}"/> of one primitive type <typeparamref name="T"/> to <see cref="Memory{T}"/> of bytes.
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/// </summary>
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/// <typeparam name="T">The type if items in the source <see cref="Memory{T}"/>.</typeparam>
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/// <param name="memory">The source <see cref="Memory{T}"/>, of type <typeparamref name="T"/>.</param>
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/// <returns>A <see cref="Memory{T}"/> of bytes.</returns>
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/// <exception cref="OverflowException">
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/// Thrown if the <see cref="Memory{T}.Length"/> property of the new <see cref="Memory{T}"/> would exceed <see cref="int.MaxValue"/>.
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/// </exception>
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/// <exception cref="ArgumentException">Thrown when the data store of <paramref name="memory"/> is not supported.</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static Memory<byte> AsBytes<T>(this Memory<T> memory)
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where T : unmanaged
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{
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return MemoryMarshal.AsMemory(((ReadOnlyMemory<T>)memory).Cast<T, byte>());
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}
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/// <summary>
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/// Casts a <see cref="Memory{T}"/> of one primitive type <typeparamref name="TFrom"/> to another primitive type <typeparamref name="TTo"/>.
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/// </summary>
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/// <typeparam name="TFrom">The type of items in the source <see cref="Memory{T}"/>.</typeparam>
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/// <typeparam name="TTo">The type of items in the destination <see cref="Memory{T}"/>.</typeparam>
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/// <param name="memory">The source <see cref="Memory{T}"/>, of type <typeparamref name="TFrom"/>.</param>
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/// <returns>A <see cref="Memory{T}"/> of type <typeparamref name="TTo"/></returns>
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/// <exception cref="ArgumentException">Thrown when the data store of <paramref name="memory"/> is not supported.</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static Memory<TTo> Cast<TFrom, TTo>(this Memory<TFrom> memory)
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where TFrom : unmanaged
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where TTo : unmanaged
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{
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return MemoryMarshal.AsMemory(((ReadOnlyMemory<TFrom>)memory).Cast<TFrom, TTo>());
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}
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/// <summary>
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/// Returns a <see cref="Stream"/> wrapping the contents of the given <see cref="Memory{T}"/> of <see cref="byte"/> instance.
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/// </summary>
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/// <param name="memory">The input <see cref="Memory{T}"/> of <see cref="byte"/> instance.</param>
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/// <returns>A <see cref="Stream"/> wrapping the data within <paramref name="memory"/>.</returns>
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/// <remarks>
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/// Since this method only receives a <see cref="Memory{T}"/> instance, which does not track
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/// the lifetime of its underlying buffer, it is responsibility of the caller to manage that.
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/// In particular, the caller must ensure that the target buffer is not disposed as long
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/// as the returned <see cref="Stream"/> is in use, to avoid unexpected issues.
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/// </remarks>
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/// <exception cref="ArgumentException">Thrown when <paramref name="memory"/> has an invalid data store.</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static Stream AsStream(this Memory<byte> memory)
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{
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return MemoryStream.Create(memory, false);
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}
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}
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