pdfium: only init pdfium library one and destroy on LO exit

With more and more usage of PDFium, it is hard to keep track of
the life-time of the PDFium library, so it can happen that a
FPDF_DestroyLibrary happens when we still have another instance
where PDFium is still use. The result of this is a crash. To
prevent this, just initialize the library once and delete, when
on LO exit.

This can be improved in the future to only keep the library
active when in actual use.

Change-Id: I5c7e5de7f8b97d10efb394c67c7a61b976c8d57c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/95391
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/include/vcl/filter/PDFiumLibrary.hxx b/include/vcl/filter/PDFiumLibrary.hxx
new file mode 100644
index 000000000000..bc7912c17e81
--- /dev/null
+++ b/include/vcl/filter/PDFiumLibrary.hxx
@@ -0,0 +1,43 @@
+/* -*- 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/.
+ *
+ */
+
+#pragma once
+
+#include <config_features.h>
+
+#if HAVE_FEATURE_PDFIUM
+
+#include <memory>
+#include <rtl/instance.hxx>
+#include <vcl/dllapi.h>
+
+namespace vcl::pdf
+{
+class VCL_DLLPUBLIC PDFium final
+{
+private:
+    PDFium(const PDFium&) = delete;
+    PDFium& operator=(const PDFium&) = delete;
+
+public:
+    PDFium();
+    ~PDFium();
+};
+
+struct PDFiumLibrary : public rtl::StaticWithInit<std::shared_ptr<PDFium>, PDFiumLibrary>
+{
+    std::shared_ptr<PDFium> operator()() { return std::make_shared<PDFium>(); }
+};
+
+} // namespace vcl::pdf
+
+#endif // HAVE_FEATURE_PDFIUM
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */