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100 lines
5 KiB
C#
100 lines
5 KiB
C#
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using Microsoft.IO;
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using System;
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namespace Ryujinx.Common.Memory
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{
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public static class MemoryStreamManager
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{
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private static readonly RecyclableMemoryStreamManager _shared = new RecyclableMemoryStreamManager();
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/// <summary>
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/// We don't expose the <c>RecyclableMemoryStreamManager</c> directly because version 2.x
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/// returns them as <c>MemoryStream</c>. This Shared class is here to a) offer only the GetStream() versions we use
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/// and b) return them as <c>RecyclableMemoryStream</c> so we don't have to cast.
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/// </summary>
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public static class Shared
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{
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/// <summary>
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/// Retrieve a new <c>MemoryStream</c> object with no tag and a default initial capacity.
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/// </summary>
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/// <returns>A <c>RecyclableMemoryStream</c></returns>
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public static RecyclableMemoryStream GetStream()
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=> new RecyclableMemoryStream(_shared);
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/// <summary>
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/// Retrieve a new <c>MemoryStream</c> object with the contents copied from the provided
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/// buffer. The provided buffer is not wrapped or used after construction.
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/// </summary>
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/// <remarks>The new stream's position is set to the beginning of the stream when returned.</remarks>
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/// <param name="buffer">The byte buffer to copy data from</param>
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/// <returns>A <c>RecyclableMemoryStream</c></returns>
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public static RecyclableMemoryStream GetStream(byte[] buffer)
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=> GetStream(Guid.NewGuid(), null, buffer, 0, buffer.Length);
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/// <summary>
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/// Retrieve a new <c>MemoryStream</c> object with the given tag and with contents copied from the provided
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/// buffer. The provided buffer is not wrapped or used after construction.
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/// </summary>
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/// <remarks>The new stream's position is set to the beginning of the stream when returned.</remarks>
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/// <param name="buffer">The byte buffer to copy data from</param>
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/// <returns>A <c>RecyclableMemoryStream</c></returns>
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public static RecyclableMemoryStream GetStream(ReadOnlySpan<byte> buffer)
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=> GetStream(Guid.NewGuid(), null, buffer);
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/// <summary>
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/// Retrieve a new <c>RecyclableMemoryStream</c> object with the given tag and with contents copied from the provided
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/// buffer. The provided buffer is not wrapped or used after construction.
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/// </summary>
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/// <remarks>The new stream's position is set to the beginning of the stream when returned.</remarks>
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/// <param name="id">A unique identifier which can be used to trace usages of the stream</param>
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/// <param name="tag">A tag which can be used to track the source of the stream</param>
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/// <param name="buffer">The byte buffer to copy data from</param>
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/// <returns>A <c>RecyclableMemoryStream</c></returns>
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public static RecyclableMemoryStream GetStream(Guid id, string tag, ReadOnlySpan<byte> buffer)
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{
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RecyclableMemoryStream stream = null;
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try
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{
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stream = new RecyclableMemoryStream(_shared, id, tag, buffer.Length);
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stream.Write(buffer);
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stream.Position = 0;
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return stream;
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}
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catch
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{
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stream?.Dispose();
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throw;
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}
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}
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/// <summary>
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/// Retrieve a new <c>RecyclableMemoryStream</c> object with the given tag and with contents copied from the provided
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/// buffer. The provided buffer is not wrapped or used after construction.
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/// </summary>
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/// <remarks>The new stream's position is set to the beginning of the stream when returned</remarks>
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/// <param name="id">A unique identifier which can be used to trace usages of the stream</param>
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/// <param name="tag">A tag which can be used to track the source of the stream</param>
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/// <param name="buffer">The byte buffer to copy data from</param>
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/// <param name="offset">The offset from the start of the buffer to copy from</param>
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/// <param name="count">The number of bytes to copy from the buffer</param>
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/// <returns>A <c>RecyclableMemoryStream</c></returns>
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public static RecyclableMemoryStream GetStream(Guid id, string tag, byte[] buffer, int offset, int count)
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{
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RecyclableMemoryStream stream = null;
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try
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{
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stream = new RecyclableMemoryStream(_shared, id, tag, count);
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stream.Write(buffer, offset, count);
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stream.Position = 0;
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return stream;
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}
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catch
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{
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stream?.Dispose();
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throw;
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}
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}
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}
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}
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}
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