From b84f57e56d87691d6e592d1ff0b42d186cc70b98 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sun, 7 Jul 2013 17:26:03 -0400
Subject: Ignore broken DecodeParms for stream with no filters

---
 libqpdf/QPDF_Stream.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDF_Stream.cc b/libqpdf/QPDF_Stream.cc
index 6ca88caf..0a82f22b 100644
--- a/libqpdf/QPDF_Stream.cc
+++ b/libqpdf/QPDF_Stream.cc
@@ -295,8 +295,13 @@ QPDF_Stream::filterable(std::vector<std::string>& filters,
         }
     }
 
-    if (decode_parms.size() != filters.size())
+    // Ignore /DecodeParms entirely if /Filters is empty.  At least
+    // one case of a file whose /DecodeParms was [ << >> ] when
+    // /Filters was empty has been seen in the wild.
+    if ((filters.size() != 0) && (decode_parms.size() != filters.size()))
     {
+        // We should just issue a warning and treat this as not
+        // filterable.
 	throw QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
 		      "", this->offset,
 		      "stream /DecodeParms length is"
-- 
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