From 3a1ff5ded9cf22e114991b5a49857b54f8e56b02 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Fri, 28 Jul 2017 19:18:57 -0400
Subject: Add option to preserve unreferenced objects

---
 libqpdf/QPDF.cc       | 16 ++++++++++++++++
 libqpdf/QPDFWriter.cc | 18 ++++++++++++++++++
 2 files changed, 34 insertions(+)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index 4d5bf67f..d82813d0 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -989,6 +989,22 @@ QPDF::showXRefTable()
     }
 }
 
+std::vector<QPDFObjectHandle>
+QPDF::getAllObjects()
+{
+    std::vector<QPDFObjectHandle> result;
+    for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
+	     this->xref_table.begin();
+	 iter != this->xref_table.end(); ++iter)
+    {
+
+	QPDFObjGen const& og = (*iter).first;
+        result.push_back(QPDFObjectHandle::Factory::newIndirect(
+                             this, og.getObj(), og.getGen()));
+    }
+    return result;
+}
+
 void
 QPDF::setLastObjectDescription(std::string const& description,
 			       int objid, int generation)
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 59e306fc..01309f43 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -58,6 +58,7 @@ QPDFWriter::init()
     stream_data_mode = qpdf_s_compress;
     qdf_mode = false;
     precheck_streams = false;
+    preserve_unreferenced_objects = false;
     static_id = false;
     suppress_original_object_ids = false;
     direct_stream_lengths = true;
@@ -183,6 +184,12 @@ QPDFWriter::setPrecheckStreams(bool val)
     this->precheck_streams = val;
 }
 
+void
+QPDFWriter::setPreserveUnreferencedObjects(bool val)
+{
+    this->preserve_unreferenced_objects = val;
+}
+
 void
 QPDFWriter::setMinimumPDFVersion(std::string const& version)
 {
@@ -3074,6 +3081,17 @@ QPDFWriter::writeStandard()
     writeHeader();
     writeString(this->extra_header_text);
 
+    if (this->preserve_unreferenced_objects)
+    {
+        QTC::TC("qpdf", "QPDFWriter preserve unreferenced standard");
+        std::vector<QPDFObjectHandle> all = this->pdf.getAllObjects();
+        for (std::vector<QPDFObjectHandle>::iterator iter = all.begin();
+             iter != all.end(); ++iter)
+        {
+            enqueueObject(*iter);
+        }
+    }
+
     // Put root first on queue.
     QPDFObjectHandle trailer = getTrimmedTrailer();
     enqueueObject(trailer.getKey("/Root"));
-- 
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