From f827d8a380e38abd502ccf75cbe4587f0bf6bf2a Mon Sep 17 00:00:00 2001
From: Andreas Huggel <ahuggel@gmx.net>
Date: Thu, 12 Mar 2009 09:15:09 +0000
Subject: [PATCH] #619: Check for empty buffer. Fixes crash with some PNG
 images. (Lukasz Krzyzak)

---
 src/pngchunk.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pngchunk.cpp b/src/pngchunk.cpp
index acefc88d..1992fbdc 100644
--- a/src/pngchunk.cpp
+++ b/src/pngchunk.cpp
@@ -619,6 +619,9 @@ namespace Exiv2 {
                                             0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
                                             0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,10,11,12,
                                             13,14,15};
+        if (text.size_ == 0) {
+            return DataBuf();
+        }
 
         sp = (char*)text.pData_+1;