From 1c944e4c89cf09d86f4e3f79ff57d937dab9b60f Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 14 Jul 2012 08:07:23 -0400
Subject: Have QPDFWriter detect foreign objects while writing

Throw an exception that directs the user to QPDF::copyForeignObject.
---
 libqpdf/QPDFWriter.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'libqpdf/QPDFWriter.cc')

diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index a7c78b19..ce5cb3e0 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -761,6 +761,15 @@ QPDFWriter::enqueueObject(QPDFObjectHandle object)
 {
     if (object.isIndirect())
     {
+        if (object.getOwningQPDF() != &(this->pdf))
+        {
+            QTC::TC("qpdf", "QPDFWriter foreign object");
+            throw std::logic_error(
+                "QPDFObjectHandle from different QPDF found while writing."
+                "  Use QPDF::copyForeignObject to add objects from"
+                " another file.");
+        }
+
 	if (object.isNull())
 	{
 	    // This is a place-holder object for an object stream
-- 
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