From 46611f0710fa08f1a90134a84cfccec3a1e49f94 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Fri, 11 Aug 2017 20:10:28 -0400
Subject: Prevent a division by zero error (fixes #141)

Bad /W in an xref stream could cause a division by zero error. Now
this is handled as a special case.
---
 libqpdf/QPDFWriter.cc | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libqpdf/QPDFWriter.cc')

diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 8ee322af..8d5f0682 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -2056,6 +2056,10 @@ QPDFWriter::generateObjectStreams()
     std::vector<QPDFObjGen> const& eligible =
         QPDF::Writer::getCompressibleObjGens(this->pdf);
     unsigned int n_object_streams = (eligible.size() + 99) / 100;
+    if (n_object_streams == 0)
+    {
+        throw std::logic_error("n_object_streams == 0");
+    }
     unsigned int n_per = eligible.size() / n_object_streams;
     if (n_per * n_object_streams < eligible.size())
     {
-- 
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