From c9739a3a230e3df34c81298890f041f7f44f279c Mon Sep 17 00:00:00 2001
From: Marek Safar <marek.safar@gmail.com>
Date: Thu, 19 Feb 2015 12:55:16 +0100
Subject: [PATCH] Fix a bug when setting capacity to 0 on MemoryStream causes
 crash on ToArray call

---
 mcs/class/referencesource/mscorlib/system/io/memorystream.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mcs/class/referencesource/mscorlib/system/io/memorystream.cs b/mcs/class/referencesource/mscorlib/system/io/memorystream.cs
index 61c64d9276e..d5f9b48606b 100644
--- a/mcs/class/referencesource/mscorlib/system/io/memorystream.cs
+++ b/mcs/class/referencesource/mscorlib/system/io/memorystream.cs
@@ -580,6 +580,11 @@ namespace System.IO {
         }
         
         public virtual byte[] ToArray() {
+#if MONO
+            // Bug fix for BCL bug when _buffer is null
+            if (_length - _origin == 0)
+                return EmptyArray<byte>.Value;
+#endif
             BCLDebug.Perf(_exposable, "MemoryStream::GetBuffer will let you avoid a copy.");
             byte[] copy = new byte[_length - _origin];
             Buffer.InternalBlockCopy(_buffer, _origin, copy, 0, _length - _origin);
-- 
2.11.4.GIT