xmlsecurity: extract OOXML export code into its own class

It was odd that import code had its own OOXMLSecParser, but export code
was buried in the controller.

Change-Id: Ie1964bf9c54a8b779981e8d72bf4810090cf960c

xmlsecurity/Library_xmlsecurity.mk

@@ -56,6 +56,7 @@ $(eval $(call gb_Library_add_exception_objects,xmlsecurity,\
 	xmlsecurity/source/helper/documentsignaturehelper \
 	xmlsecurity/source/helper/documentsignaturemanager \
 	xmlsecurity/source/helper/ooxmlsecparser \
+	xmlsecurity/source/helper/ooxmlsecexporter \
 	xmlsecurity/source/helper/xmlsignaturehelper2 \
 	xmlsecurity/source/helper/xmlsignaturehelper \
 	xmlsecurity/source/helper/xsecctl \

xmlsecurity/source/helper/ooxmlsecexporter.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECEXPORTER_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECEXPORTER_HXX
+
+#include <memory>
+
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <xmlsecurity/sigstruct.hxx>
+
+/// Writes a single OOXML digital signature.
+class OOXMLSecExporter
+{
+    struct Impl;
+    std::unique_ptr<Impl> m_pImpl;
+
+public:
+    OOXMLSecExporter(const css::uno::Reference<css::uno::XComponentContext>& xComponentContext,
+                     const css::uno::Reference<css::embed::XStorage>& xRootStorage,
+                     const css::uno::Reference<css::xml::sax::XDocumentHandler>& xDocumentHandler,
+                     const SignatureInformation& rInformation);
+    ~OOXMLSecExporter();
+    void writeSignature();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */