Implement deterministic ID

For non-encrypted files, determinstic ID generation uses file contents
instead of timestamp and file name. At a small runtime cost, this
enables generation of the same /ID if the same inputs are converted in
the same way multiple times.

1 files changed, 6 insertions, 0 deletions

diff --git a/libqpdf/qpdf-c.cc b/libqpdf/qpdf-c.cc
index a46df63e..c8adb9e4 100644
--- a/libqpdf/qpdf-c.cc
+++ b/libqpdf/qpdf-c.cc
@@ -512,6 +512,12 @@ void qpdf_set_qdf_mode(qpdf_data qpdf, QPDF_BOOL value)
     qpdf->qpdf_writer->setQDFMode(value);
 }
 
+void qpdf_set_deterministic_ID(qpdf_data qpdf, QPDF_BOOL value)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_set_deterministic_ID");
+    qpdf->qpdf_writer->setDeterministicID(value);
+}
+
 void qpdf_set_static_ID(qpdf_data qpdf, QPDF_BOOL value)
 {
     QTC::TC("qpdf", "qpdf-c called qpdf_set_static_ID");