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diff --git a/sw/inc/iodetect.hxx b/sw/inc/iodetect.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_SW_INC_IODETECT_HXX
+#define INCLUDED_SW_INC_IODETECT_HXX
+
+#include <memory>
+#include <string_view>
+#include <o3tl/string_view.hxx>
+#include <rtl/ustring.hxx>
+#include <tools/lineend.hxx>
+#include <utility>
+#include <tools/solar.h>
+#include "swdllapi.h"
+
+inline constexpr OUString FILTER_RTF = u"RTF"_ustr;       ///< RTF filter
+inline constexpr OUString sRtfWH = u"WH_RTF"_ustr;
+inline constexpr OUString FILTER_TEXT = u"TEXT"_ustr; ///< text filter with default codeset
+inline constexpr OUString FILTER_BAS = u"BAS"_ustr;       ///< StarBasic (identical to ANSI)
+inline constexpr OUString FILTER_WW8 = u"CWW8"_ustr;      ///< WinWord 97 filter
+inline constexpr OUString FILTER_TEXT_DLG = u"TEXT_DLG"_ustr;  ///< text filter with encoding dialog
+inline constexpr OUString FILTER_XML = u"CXML"_ustr;      ///< XML filter
+#define FILTER_XMLV     "CXMLV"     ///< XML filter
+#define FILTER_XMLVW    "CXMLVWEB"  ///< XML filter
+inline constexpr OUString FILTER_DOCX = u"OXML"_ustr;
+inline constexpr OUString sHTML = u"HTML"_ustr;
+inline constexpr OUString sWW5 = u"WW6"_ustr;
+inline constexpr OUString sWW6 = u"CWW6"_ustr;
+
+inline constexpr OUString sSWRITER = u"swriter"_ustr;
+inline constexpr OUString sSWRITERWEB = u"swriter/web"_ustr;
+
+class SfxFilter;
+class SfxFilterContainer;
+class SotStorage;
+class SvStream;
+namespace com::sun::star::embed { class XStorage; }
+namespace com::sun::star::uno { template <typename> class Reference; }
+
+struct SwIoDetect
+{
+    const OUString sName;
+
+    SwIoDetect(OUString aN)
+        : sName(std::move(aN))
+    {
+    }
+
+    bool IsFilter( std::u16string_view rNm ) const
+    {
+        return o3tl::starts_with(rNm, sName);
+    }
+};
+
+enum ReaderWriterEnum {
+    READER_WRITER_RTF,
+    READER_WRITER_BAS,
+    READER_WRITER_WW6,
+    READER_WRITER_WW8,
+    READER_WRITER_RTF_WH,
+    READER_WRITER_HTML,
+    READER_WRITER_WW5,
+    READER_WRITER_XML,
+    READER_WRITER_TEXT_DLG,
+    READER_WRITER_TEXT,
+    READER_WRITER_DOCX,
+    MAXFILTER
+};
+
+extern SwIoDetect aFilterDetect[];
+
+/** The following class is a wrapper for basic i/o functions of Writer 3.0.
+ Everything is static. All filter names mentioned are Writer-internal
+ names, i.e. the names in front of the equality sign in INSTALL.INI, like SWG
+ or ASCII.*/
+
+class SwIoSystem
+{
+public:
+    /// find for an internal format name the corresponding filter entry
+    SW_DLLPUBLIC static std::shared_ptr<const SfxFilter>
+        GetFilterOfFormat( std::u16string_view rFormat,
+            const SfxFilterContainer* pCnt = nullptr );
+
+    /** Detect for the given file which filter should be used. The filter name
+     is returned. If no filter could be found, the name of the ASCII filter
+     is returned! */
+    static std::shared_ptr<const SfxFilter> GetFileFilter(const OUString& rFileName);
+
+    static bool IsValidStgFilter( SotStorage& , const SfxFilter& );
+    static bool IsValidStgFilter( const css::uno::Reference < css::embed::XStorage >& rStg, const SfxFilter& rFilter);
+
+    // tdf#106899 - wrapper around IsDetectableText to retrieve the text encoding for a given stream
+    SW_DLLPUBLIC static rtl_TextEncoding GetTextEncoding(SvStream&);
+    static bool IsDetectableText( const char* pBuf, sal_uLong &rLen,
+            rtl_TextEncoding *pCharSet, bool *pSwap, LineEnd *pLineEnd, bool *pBom);
+
+    static OUString GetSubStorageName( const SfxFilter& rFltr );
+};
+
+extern "C" SAL_DLLPUBLIC_EXPORT bool SAL_CALL TestImportFODT(SvStream &rStream);
+extern "C" SAL_DLLPUBLIC_EXPORT bool SAL_CALL TestPDFExportFODT(SvStream &rStream);
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */