From 521408b07c6682e95075538a7073f16e5f118574 Mon Sep 17 00:00:00 2001
From: hexawyz <8518235+hexawyz@users.noreply.github.com>
Date: Sat, 8 Feb 2025 22:39:58 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20pinning=20of=20memory=20ma?=
 =?UTF-8?q?pped=20file=20buffers=20beyond=20the=20first=20byte.?=
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This is the main reason for corruption of GIF images uploaded to Kraken Z. (Simply would not occur for images smaller than 2MB)
---
 src/Exo/Core/Exo.Memory/MemoryMappedFileMemoryManager.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Exo/Core/Exo.Memory/MemoryMappedFileMemoryManager.cs b/src/Exo/Core/Exo.Memory/MemoryMappedFileMemoryManager.cs
index 039f629..35c0316 100644
--- a/src/Exo/Core/Exo.Memory/MemoryMappedFileMemoryManager.cs
+++ b/src/Exo/Core/Exo.Memory/MemoryMappedFileMemoryManager.cs
@@ -31,9 +31,10 @@ protected override void Dispose(bool disposing)
 
 	public override MemoryHandle Pin(int elementIndex = 0)
 	{
+		ArgumentOutOfRangeException.ThrowIfGreaterThan((uint)elementIndex, (uint)_length, nameof(elementIndex));
 		byte* pointer = null;
 		_viewHandle.AcquirePointer(ref pointer);
-		return new MemoryHandle(pointer, pinnable: this);
+		return new MemoryHandle(pointer + (uint)elementIndex, pinnable: this);
 	}
 
 	public override void Unpin() => _viewHandle.ReleasePointer();