tdf#160196 add /AF entry to catalog, enable assoc. files in PDF/A-3

PDF 2.0 introduced "associated files" entry. Add the association
for the attached files to the /Catalog (/AF entry) and make sure
the /AFRelationship is set to /Source.

Also enable this for PDF/A-3 (where this was apparently added),
as this is required.

Change-Id: I5d0048daeb6e78534cef8ceb467f6dd2627a53ba
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/180566
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Jenkins
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/180875
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index 6dffb86b6c19..851663a9e101 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -5156,6 +5156,13 @@ bool PDFWriterImpl::emitCatalog()
         aWriter.startObject(rAttachedFile.mnObjectId);
         aWriter.startDict();
         aWriter.write("/Type", "/Filespec");
+
+        // Add associated files relationship (since PDF 2.0)
+        if (m_aContext.Version >= PDFWriter::PDFVersion::PDF_2_0 || m_nPDFA_Version == 3)
+        {
+            aWriter.write("/AFRelationship", "/Source");
+        }
+
         aWriter.writeKeyAndUnicodeEncrypt("/F", rAttachedFile.maFilename, rAttachedFile.mnObjectId);
         if (PDFWriter::PDFVersion::PDF_1_7 <= m_aContext.Version)
         {
@@ -5195,6 +5202,16 @@ bool PDFWriterImpl::emitCatalog()
 
     if (!m_aDocumentAttachedFiles.empty())
     {
+        // Write the associated files catalog entry (since PDF 2.0)
+        if (m_aContext.Version >= PDFWriter::PDFVersion::PDF_2_0 || m_nPDFA_Version == 3)
+        {
+            aLine.append("/AF");
+            aLine.append("[");
+            for (auto & rAttachedFile : m_aDocumentAttachedFiles)
+                aWriter.writeReference(rAttachedFile.mnObjectId);
+            aLine.append("]");
+        }
+
         aWriter.startDictWithKey("/Names");
         aWriter.startDictWithKey("/EmbeddedFiles");
         aLine.append("/Names [");