Truncate StreamDecorator reads

Fixes: ironfede#184
Visionaid-International-Ltd · Oct 9, 2024 · 321a8f4 · 321a8f4
1 parent 578d5a6
commit 321a8f4
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/sources/OpenMcdf.Extensions/StreamDecorator.cs b/sources/OpenMcdf.Extensions/StreamDecorator.cs
@@ -66,6 +66,11 @@ public override int Read(byte[] buffer, int offset, int count)
             if (position >= cfStream.Size)
                 return 0;
 
+            int maxReadableLength = (int)Math.Min(int.MaxValue, Length - Position);
+            count = Math.Max(0, Math.Min(maxReadableLength, count));
+            if (count == 0)
+                return 0;
+
             count = cfStream.Read(buffer, position, offset, count);
             position += count;
             return count;