From 451e8f93cc255d8515916ce305fbd18dd40dcd81 Mon Sep 17 00:00:00 2001
From: ElektroKill <elektrokilldev@protonmail.com>
Date: Mon, 10 Jul 2023 14:49:35 +0200
Subject: [PATCH] Validate serialized resource data format when writing

---
 src/DotNet/Resources/UserResourceData.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/DotNet/Resources/UserResourceData.cs b/src/DotNet/Resources/UserResourceData.cs
index fcfe0b9e5..17e82714d 100644
--- a/src/DotNet/Resources/UserResourceData.cs
+++ b/src/DotNet/Resources/UserResourceData.cs
@@ -1,5 +1,6 @@
 // dnlib: See LICENSE.txt for more info
 
+using System;
 using System.IO;
 using System.Runtime.Serialization;
 using dnlib.IO;
@@ -68,6 +69,8 @@ public BinaryResourceData(UserResourceType type, byte[] data, SerializationForma
 
 		/// <inheritdoc/>
 		public override void WriteData(ResourceBinaryWriter writer, IFormatter formatter) {
+			if (writer.ReaderType == ResourceReaderType.ResourceReader && Format != SerializationFormat.BinaryFormatter)
+				throw new NotSupportedException();
 			if (writer.ReaderType == ResourceReaderType.DeserializingResourceReader) {
 				writer.Write7BitEncodedInt((int)format);
 				writer.Write7BitEncodedInt(data.Length);