handle files with object 0 as a real object

git-svn-id: svn+q:///qpdf/trunk@1049 71b93d88-0707-0410-a8cf-f5a4172ac649

1 files changed, 13 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index ecc174b9..bcf8e9f8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2011-01-31  Jay Berkenbilt  <ejb@ql.org>
+
+	* libqpdf/QPDF.cc (readObjectAtOffset): use -1 rather than 0 when
+	reading an object at a given to indicate that no object number is
+	expected.  This allows xref recovery to proceed even if a file
+	uses the invalid object number 0 as a regular object.
+
+	* libqpdf/QPDF_linearization.cc (isLinearized): use -1 rather than
+	0 as a sentintel for not having found the first object in the
+	file.  Since -1 can never match the regular expression, this
+	prevents an infinite loop when checking a file that starts with
+	(erroneous) 0 0 obj.  (Fixes qpdf-Bugs-3159950.)
+
 2010-10-04  Jay Berkenbilt  <ejb@ql.org>
 
 	* 2.2.2: release