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diff --git a/vcl/win/dtrans/ImplHelper.hxx b/vcl/win/dtrans/ImplHelper.hxx
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+++ b/vcl/win/dtrans/ImplHelper.hxx
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+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+
+#if !defined WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <objidl.h>
+
+// target device and formatetc helper
+void DeleteTargetDevice(DVTARGETDEVICE* ptd);
+bool CopyFormatEtc(LPFORMATETC petcDest, LPFORMATETC petcSrc);
+sal_Int32 CompareFormatEtc(const FORMATETC* pFetcLeft, const FORMATETC* pFetcRight);
+bool CompareTargetDevice(DVTARGETDEVICE* ptdLeft, DVTARGETDEVICE const* ptdRight);
+DVTARGETDEVICE* CopyTargetDevice(DVTARGETDEVICE* ptdSrc);
+
+// some codepage helper functions
+
+// returns a windows codepage appropriate to the
+// given mime charset parameter value
+
+sal_uInt32 getWinCPFromMimeCharset(const OUString& charset);
+
+// returns a windows codepage appropriate to the
+// given locale and locale type
+
+OUString getWinCPFromLocaleId(LCID lcid, LCTYPE lctype);
+
+// returns a mime charset parameter value appropriate
+// to the given codepage, optional a prefix can be
+// given, e.g. "windows-" or "cp"
+
+OUString getMimeCharsetFromWinCP(sal_uInt32 cp, std::u16string_view aPrefix);
+
+// returns a mime charset parameter value appropriate
+// to the given locale id and locale type, optional a
+// prefix can be given, e.g. "windows-" or "cp"
+
+OUString getMimeCharsetFromLocaleId(LCID lcid, LCTYPE lctype, std::u16string_view aPrefix);
+
+// returns true, if a given codepage is an oem codepage
+
+bool IsOEMCP(sal_uInt32 codepage);
+
+// converts a codepage into a string representation
+
+OUString cptostr(sal_uInt32 codepage);
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */