From 2305674a0926e27124e3b184faea9bee0070e839 Mon Sep 17 00:00:00 2001
From: Chris Vigelius <me@cv.gd>
Date: Thu, 28 Sep 2023 19:31:53 +0200
Subject: [PATCH] fix data corruption when FILEGROUPDESCRIPTOR is larger than
 4k

Due to missing offset in Marshal.Copy, ReadHGlobalIntoStream replicates the first 4k of the hGlobal, leading to truncated filenames when dragging a lot of mails (10 or more).
---
 OutlookFileDrag/DataObjectHelper.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OutlookFileDrag/DataObjectHelper.cs b/OutlookFileDrag/DataObjectHelper.cs
index 3242d2f..97bb8cd 100644
--- a/OutlookFileDrag/DataObjectHelper.cs
+++ b/OutlookFileDrag/DataObjectHelper.cs
@@ -392,7 +392,7 @@ private static void ReadHGlobalIntoStream(IntPtr handle, Stream stream)
                 {
                     //Copy buffer length or remaining length, whichever is smaller
                     bytesToCopy = Math.Min(buffer.Length, length - offset);
-                    Marshal.Copy(source, buffer, 0, bytesToCopy);
+                    Marshal.Copy(source + offset, buffer, 0, bytesToCopy);
                     stream.Write(buffer, 0, bytesToCopy);
                 }
             }