From 62c1b42328832cc2ffe1bf4f10658738a192a192 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 5 Jun 2010 19:48:32 +0000
Subject: detect degenerate case of empty xref table

git-svn-id: svn+q:///qpdf/trunk@970 71b93d88-0707-0410-a8cf-f5a4172ac649
---
 libqpdf/QPDF.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index 67d0b587..4a673be8 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -538,7 +538,11 @@ QPDF::read_xref(off_t xref_offset)
     }
 
     int size = this->trailer.getKey("/Size").getIntValue();
-    int max_obj = (*(xref_table.rbegin())).first.obj;
+    int max_obj = 0;
+    if (! xref_table.empty())
+    {
+	(*(xref_table.rbegin())).first.obj;
+    }
     if (! this->deleted_objects.empty())
     {
 	max_obj = std::max(max_obj, *(this->deleted_objects.rbegin()));
-- 
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