Fix dangling references (fixes #240)

On certain operations, such as iterating through all objects and
adding new indirect objects, walk through the entire object structure
and explicitly resolve any indirect references to non-existent
objects. That prevents new objects from springing into existence and
causing the previously dangling references to point to them.

1 files changed, 1 insertions, 0 deletions

diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 71c48333..22b990ff 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -2244,6 +2244,7 @@ QPDFWriter::prepareFileForWrite()
     // includes stream lengths, stream filtering parameters, and
     // document extension level information.
 
+    this->m->pdf.fixDanglingReferences(true);
     std::list<QPDFObjectHandle> queue;
     queue.push_back(getTrimmedTrailer());
     std::set<int> visited;