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diff --git a/sal/textenc/converter.hxx b/sal/textenc/converter.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 .
+ */
+
+#ifndef INCLUDED_SAL_TEXTENC_CONVERTER_HXX
+#define INCLUDED_SAL_TEXTENC_CONVERTER_HXX
+
+#include <sal/config.h>
+#include <sal/saldllapi.h>
+#include <sal/types.h>
+
+// Internal, non-stable ABI
+
+namespace sal::detail::textenc {
+
+enum BadInputConversionAction
+{
+    BAD_INPUT_STOP,
+    BAD_INPUT_CONTINUE,
+    BAD_INPUT_NO_OUTPUT
+};
+
+BadInputConversionAction SAL_DLLPUBLIC
+handleBadInputTextToUnicodeConversion(
+    bool bUndefined, bool bMultiByte, char cByte, sal_uInt32 nFlags,
+    sal_Unicode ** pDestBufPtr, const sal_Unicode * pDestBufEnd, sal_uInt32 * pInfo);
+
+BadInputConversionAction SAL_DLLPUBLIC
+handleBadInputUnicodeToTextConversion(
+    bool bUndefined, sal_uInt32 nUtf32, sal_uInt32 nFlags, char ** pDestBufPtr,
+    const char * pDestBufEnd, sal_uInt32 * pInfo, char const * pPrefix,
+    sal_Size nPrefixLen, bool * pPrefixWritten);
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */