From f4e879a1e6ad810aa38c1c020467a2589441871b Mon Sep 17 00:00:00 2001
From: Mary-nyan <mary@mary.zone>
Date: Thu, 24 Nov 2022 15:26:29 +0100
Subject: Reduce usage of Marshal.PtrToStructure and Marshal.StructureToPtr
 (#3805)

* common: Make BinaryReaderExtensions Read & Write take unamanged types

This allows us to not rely on Marshal.PtrToStructure and Marshal.StructureToPtr for those.

* common: Make MemoryHelper Read & Write takes unamanged types

* Update Marshal.SizeOf => Unsafe.SizeOf when appropriate and start moving software applet to unmanaged types
---
 .../Extensions/BinaryReaderExtensions.cs           | 43 +++-------------------
 1 file changed, 5 insertions(+), 38 deletions(-)

(limited to 'Ryujinx.Common/Extensions/BinaryReaderExtensions.cs')

diff --git a/Ryujinx.Common/Extensions/BinaryReaderExtensions.cs b/Ryujinx.Common/Extensions/BinaryReaderExtensions.cs
index 2c24678d..ea404d2a 100644
--- a/Ryujinx.Common/Extensions/BinaryReaderExtensions.cs
+++ b/Ryujinx.Common/Extensions/BinaryReaderExtensions.cs
@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 namespace Ryujinx.Common
@@ -7,49 +8,15 @@ namespace Ryujinx.Common
     public static class BinaryReaderExtensions
     {
         public unsafe static T ReadStruct<T>(this BinaryReader reader)
-            where T : struct
+            where T : unmanaged
         {
-            int size = Marshal.SizeOf<T>();
-
-            byte[] data = reader.ReadBytes(size);
-
-            fixed (byte* ptr = data)
-            {
-                return Marshal.PtrToStructure<T>((IntPtr)ptr);
-            }
-        }
-
-        public unsafe static T[] ReadStructArray<T>(this BinaryReader reader, int count)
-            where T : struct
-        {
-            int size = Marshal.SizeOf<T>();
-
-            T[] result = new T[count];
-
-            for (int i = 0; i < count; i++)
-            {
-                byte[] data = reader.ReadBytes(size);
-
-                fixed (byte* ptr = data)
-                {
-                    result[i] = Marshal.PtrToStructure<T>((IntPtr)ptr);
-                }
-            }
-
-            return result;
+            return MemoryMarshal.Cast<byte, T>(reader.ReadBytes(Unsafe.SizeOf<T>()))[0];
         }
 
         public unsafe static void WriteStruct<T>(this BinaryWriter writer, T value)
-            where T : struct
+            where T : unmanaged
         {
-            long size = Marshal.SizeOf<T>();
-
-            byte[] data = new byte[size];
-
-            fixed (byte* ptr = data)
-            {
-                Marshal.StructureToPtr<T>(value, (IntPtr)ptr, false);
-            }
+            ReadOnlySpan<byte> data = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateReadOnlySpan(ref value, 1));
 
             writer.Write(data);
         }
-- 
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