From 3b38cc10de9082a037f1aee81877a30b727eea81 Mon Sep 17 00:00:00 2001
From: "Justin Clark-Casey (justincc)" <jjustincc@googlemail.com>
Date: Wed, 31 Mar 2010 19:51:17 +0100
Subject: [PATCH] When saving an oar/iar, don't attempt to write out the data
 byte array if it's empty On Mono 2.6 (and probably before) this causes a
 non-obvious IOException

---
 OpenSim/Framework/Serialization/TarArchiveWriter.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/OpenSim/Framework/Serialization/TarArchiveWriter.cs b/OpenSim/Framework/Serialization/TarArchiveWriter.cs
index 20d0f7e90b..0bd639ff3a 100644
--- a/OpenSim/Framework/Serialization/TarArchiveWriter.cs
+++ b/OpenSim/Framework/Serialization/TarArchiveWriter.cs
@@ -208,7 +208,9 @@ namespace OpenSim.Framework.Serialization
                 m_bw.Write(header);
     
                 // Write out data
-                m_bw.Write(data);
+                // An IOException occurs if we try to write out an empty array in Mono 2.6
+                if (data.Length > 0)
+                    m_bw.Write(data);
     
                 if (data.Length % 512 != 0)
                 {