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diff --git a/include/svl/msodocumentlockfile.hxx b/include/svl/msodocumentlockfile.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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_SVL_MSODOCUMENTLOCKFILE_HXX
+#define INCLUDED_SVL_MSODOCUMENTLOCKFILE_HXX
+
+#include <svl/svldllapi.h>
+#include <svl/documentlockfile.hxx>
+
+#define MSO_WORD_LOCKFILE_SIZE 162
+#define MSO_EXCEL_AND_POWERPOINT_LOCKFILE_SIZE 165
+#define MSO_USERNAME_MAX_LENGTH 52
+
+namespace svt
+{
+/// Class implementing reading and writing MSO lockfiles.
+class SVL_DLLPUBLIC MSODocumentLockFile final : public GenDocumentLockFile
+{
+private:
+ enum class AppType
+ {
+ Word,
+ Excel,
+ PowerPoint
+ };
+ static AppType getAppType(std::u16string_view sOrigURL);
+ AppType m_eAppType;
+
+ virtual void
+ WriteEntryToStream(std::unique_lock<std::mutex>& rGuard, const LockFileEntry& aEntry,
+ const css::uno::Reference<css::io::XOutputStream>& xStream) override;
+
+ virtual css::uno::Reference<css::io::XInputStream>
+ OpenStream(std::unique_lock<std::mutex>& rGuard) override;
+
+ virtual LockFileEntry GetLockDataImpl(std::unique_lock<std::mutex>& rGuard) override;
+
+public:
+ MSODocumentLockFile(std::u16string_view aOrigURL);
+ virtual ~MSODocumentLockFile() override;
+
+ virtual void RemoveFile() override;
+
+ static bool IsMSOSupportedFileFormat(std::u16string_view aURL);
+};
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */