xmlsecurity PDF verify: add support for object streams

Adobe Acrobat uses object streams (PDF 1.6) when it signs a PDF exported
from LO (PDF 1.4), with this we can verify that signature.

If the PDF had at least one signature in LO, then the doc is not
upgraded from PDF 1.4, so that was working already.

Change-Id: I54b4447ca965a8ba1ffc69bde228ab6f0bda59ee

2 files changed, 14 insertions, 0 deletions

diff --git a/xmlsecurity/qa/unit/pdfsigning/data/pdf16adobe.pdf b/xmlsecurity/qa/unit/pdfsigning/data/pdf16adobe.pdf
new file mode 100644
index 000000000000..ac1c5f37b972
--- /dev/null
+++ b/xmlsecurity/qa/unit/pdfsigning/data/pdf16adobe.pdf
diff --git a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
index 469ded6978c6..2f7ef572c581 100644
--- a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
+++ b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
@@ -57,6 +57,8 @@ public:
     void testPDFRemoveAll();
     /// Test a PDF 1.4 document, signed by Adobe.
     void testPDF14Adobe();
+    /// Test a PDF 1.6 document, signed by Adobe.
+    void testPDF16Adobe();
 
     CPPUNIT_TEST_SUITE(PDFSigningTest);
     CPPUNIT_TEST(testPDFAdd);
@@ -64,6 +66,7 @@ public:
     CPPUNIT_TEST(testPDFRemove);
     CPPUNIT_TEST(testPDFRemoveAll);
     CPPUNIT_TEST(testPDF14Adobe);
+    CPPUNIT_TEST(testPDF16Adobe);
     CPPUNIT_TEST_SUITE_END();
 };
 
@@ -254,6 +257,17 @@ void PDFSigningTest::testPDF14Adobe()
 #endif
 }
 
+void PDFSigningTest::testPDF16Adobe()
+{
+#ifndef _WIN32
+    // Contains a cross-reference stream, object streams and a compressed
+    // stream with a predictor. And a valid signature.
+    // Found signatures was 0, as parsing failed due to lack of support for
+    // these features.
+    verify(m_directories.getURLFromSrc(DATA_DIRECTORY) + "pdf16adobe.pdf", 1);
+#endif
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(PDFSigningTest);
 
 CPPUNIT_PLUGIN_IMPLEMENT();