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Commit Description:
Various UI improvements.
Commit Description:
Various UI improvements.
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FNA/src/Utilities/FNAInternalExtensions.cs
65 lines | 1.8 KiB | text/x-csharp | CSharpLexer
65 lines | 1.8 KiB | text/x-csharp | CSharpLexer
| r0 | #region License | |||
| /* FNA - XNA4 Reimplementation for Desktop Platforms | ||||
| * Copyright 2009-2020 Ethan Lee and the MonoGame Team | ||||
| * | ||||
| * Released under the Microsoft Public License. | ||||
| * See LICENSE for details. | ||||
| */ | ||||
| #endregion | ||||
| #region Using Statements | ||||
| using System; | ||||
| using System.IO; | ||||
| using System.Reflection; | ||||
| #endregion | ||||
| namespace Microsoft.Xna.Framework | ||||
| { | ||||
| internal static class FNAInternalExtensions | ||||
| { | ||||
| #region MemoryStream.TryGetBuffer Extension | ||||
| private static readonly FieldInfo f_MemoryStream_Public = | ||||
| // .NET | ||||
| typeof(MemoryStream).GetField("_exposable", BindingFlags.NonPublic | BindingFlags.Instance) ?? | ||||
| // Old Mono | ||||
| typeof(MemoryStream).GetField("allowGetBuffer", BindingFlags.NonPublic | BindingFlags.Instance); | ||||
| /// <summary> | ||||
| /// Returns the array of unsigned bytes from which this stream was created. | ||||
| /// The return value indicates whether the conversion succeeded. | ||||
| /// This is similar to .NET 4.6's TryGetBuffer. | ||||
| /// </summary> | ||||
| /// <param name="stream">The stream to get the buffer from.</param> | ||||
| /// <param name="buffer">The byte array from which this stream was created.</param> | ||||
| /// <returns><b>true</b> if the conversion was successful; otherwise, <b>false</b>.</returns> | ||||
| internal static bool TryGetBuffer(this MemoryStream stream, out byte[] buffer) | ||||
| { | ||||
| // Check if the buffer is public by reflecting into a known internal field. | ||||
| if (f_MemoryStream_Public != null) | ||||
| { | ||||
| if ((bool) f_MemoryStream_Public.GetValue(stream)) | ||||
| { | ||||
| buffer = stream.GetBuffer(); | ||||
| return true; | ||||
| } | ||||
| buffer = null; | ||||
| return false; | ||||
| } | ||||
| // If no known field can be found, use a horribly slow try-catch instead. | ||||
| try | ||||
| { | ||||
| buffer = stream.GetBuffer(); | ||||
| return true; | ||||
| } | ||||
| catch (UnauthorizedAccessException) | ||||
| { | ||||
| buffer = null; | ||||
| return false; | ||||
| } | ||||
| } | ||||
| #endregion | ||||
| } | ||||
| } | ||||
