From a7308953c984198c8000ac7727f6074cbc053f20 Mon Sep 17 00:00:00 2001
From: Jakub Kucharski <jakubkucharski97@gmail.com>
Date: Wed, 27 Jul 2016 08:00:42 +0200
Subject: [PATCH] fix xref entry ref.gen updating

---
 poppler/PDFDoc.cc | 11 ++++++++++-
 poppler/XRef.cc   |  3 +++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/poppler/PDFDoc.cc b/poppler/PDFDoc.cc
index 296ed1a..8096dd1 100644
--- a/poppler/PDFDoc.cc
+++ b/poppler/PDFDoc.cc
@@ -605,7 +605,16 @@ void PDFDoc::setDocInfoModified(Object *infoObj)
 {
   Object infoObjRef;
   getDocInfoNF(&infoObjRef);
-  xref->setModifiedObject(infoObj, infoObjRef.getRef());
+  Ref ref = infoObjRef.getRef();
+
+  if (xref->getEntry(ref.num)->getFlag(XRefEntry::Updated) == gTrue) {
+    infoObjRef.free();
+    return;
+  }
+
+  xref->setModifiedObject(infoObj, ref);
+  infoObjRef.initRef(ref.num, ref.gen + 1);
+  xref->getTrailerDict()->dictSet("Info", &infoObjRef);
   infoObjRef.free();
 }
 
diff --git a/poppler/XRef.cc b/poppler/XRef.cc
index f88c632..6542f63 100644
--- a/poppler/XRef.cc
+++ b/poppler/XRef.cc
@@ -1408,6 +1408,9 @@ void XRef::setModifiedObject (Object* o, Ref r) {
   XRefEntry *e = getEntry(r.num);
   e->obj.free();
   o->copy(&(e->obj));
+  if (e->getFlag(XRefEntry::Updated) == gFalse) {
+    e->gen++;
+  }
   e->setFlag(XRefEntry::Updated, gTrue);
   setModified();
 }
-- 
2.9.0