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diff --git a/sc/source/filter/oox/worksheetbuffer.cxx b/sc/source/filter/oox/worksheetbuffer.cxx
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+++ b/sc/source/filter/oox/worksheetbuffer.cxx
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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 .
+ */
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <worksheetbuffer.hxx>
+
+#include <com/sun/star/container/XIndexAccess.hpp>
+#include <com/sun/star/container/XNamed.hpp>
+#include <com/sun/star/sheet/XSpreadsheetDocument.hpp>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+#include <oox/helper/attributelist.hxx>
+#include <oox/helper/binaryinputstream.hxx>
+#include <oox/helper/containerhelper.hxx>
+#include <oox/token/namespaces.hxx>
+#include <oox/token/tokens.hxx>
+#include <document.hxx>
+#include <documentimport.hxx>
+#include <biffhelper.hxx>
+#include <globstr.hrc>
+#include <scresid.hxx>
+
+namespace oox::xls {
+
+using namespace ::com::sun::star::container;
+using namespace ::com::sun::star::sheet;
+using namespace ::com::sun::star::uno;
+
+SheetInfoModel::SheetInfoModel() :
+    mnSheetId( -1 ),
+    mnState( XML_visible )
+{
+}
+
+WorksheetBuffer::WorksheetBuffer( const WorkbookHelper& rHelper ) :
+    WorkbookHelper( rHelper )
+{
+}
+
+void WorksheetBuffer::importSheet( const AttributeList& rAttribs )
+{
+    SheetInfoModel aModel;
+    aModel.maRelId = rAttribs.getString( R_TOKEN( id ), OUString() );
+    aModel.maName = rAttribs.getXString( XML_name, OUString() );
+    aModel.mnSheetId = rAttribs.getInteger( XML_sheetId, -1 );
+    aModel.mnState = rAttribs.getToken( XML_state, XML_visible );
+    insertSheet( aModel );
+}
+
+void WorksheetBuffer::importSheet( SequenceInputStream& rStrm )
+{
+    sal_Int32 nState;
+    SheetInfoModel aModel;
+    nState = rStrm.readInt32();
+    aModel.mnSheetId = rStrm.readInt32();
+    rStrm >> aModel.maRelId >> aModel.maName;
+    static const sal_Int32 spnStates[] = { XML_visible, XML_hidden, XML_veryHidden };
+    aModel.mnState = STATIC_ARRAY_SELECT( spnStates, nState, XML_visible );
+    insertSheet( aModel );
+}
+
+sal_Int16 WorksheetBuffer::insertEmptySheet( const OUString& rPreferredName )
+{
+    IndexNamePair aIndexName = createSheet( rPreferredName, SAL_MAX_INT32 );
+    ScDocument& rDoc = getScDocument();
+
+    rDoc.SetVisible( aIndexName.first, false );
+    return aIndexName.first;
+}
+
+sal_Int32 WorksheetBuffer::getWorksheetCount() const
+{
+    return static_cast< sal_Int32 >( maSheetInfos.size() );
+}
+
+sal_Int32 WorksheetBuffer::getAllSheetCount() const
+{
+    const ScDocumentImport& rDoc = getDocImport();
+    return rDoc.getSheetCount();
+}
+
+OUString WorksheetBuffer::getWorksheetRelId( sal_Int32 nWorksheet ) const
+{
+    const SheetInfo* pSheetInfo = maSheetInfos.get( nWorksheet ).get();
+    return pSheetInfo ? pSheetInfo->maRelId : OUString();
+}
+
+sal_Int16 WorksheetBuffer::getCalcSheetIndex( sal_Int32 nWorksheet ) const
+{
+    const SheetInfo* pSheetInfo = maSheetInfos.get( nWorksheet ).get();
+    return pSheetInfo ? pSheetInfo->mnCalcSheet : -1;
+}
+
+OUString WorksheetBuffer::getCalcSheetName( sal_Int32 nWorksheet ) const
+{
+    const SheetInfo* pSheetInfo = maSheetInfos.get( nWorksheet ).get();
+    return pSheetInfo ? pSheetInfo->maCalcName : OUString();
+}
+
+void WorksheetBuffer::convertSheetNameRef( OUString& sSheetNameRef ) const
+{
+    if( !sSheetNameRef.startsWith("#") )
+        return;
+
+    sal_Int32 nSepPos = sSheetNameRef.lastIndexOf( '!' );
+    if( nSepPos <= 0 )
+        return;
+
+    // Do not attempt to blindly convert '#SheetName!A1' to
+    // '#SheetName.A1', it can be #SheetName!R1C1 as well. Hyperlink
+    // handler has to handle all, but prefer '#SheetName.A1' if
+    // possible.
+    if (nSepPos < sSheetNameRef.getLength() - 1)
+    {
+        ScRange aRange;
+        if ((aRange.ParseAny( sSheetNameRef.copy( nSepPos + 1 ), getScDocument(),
+                        formula::FormulaGrammar::CONV_XL_R1C1) & ScRefFlags::VALID) == ScRefFlags::ZERO)
+            sSheetNameRef = sSheetNameRef.replaceAt( nSepPos, 1, rtl::OUStringChar( '.' ) );
+    }
+    // #i66592# convert sheet names that have been renamed on import
+    OUString aSheetName = sSheetNameRef.copy( 1, nSepPos - 1 );
+    OUString aCalcName = getCalcSheetName( aSheetName );
+    if( !aCalcName.isEmpty() )
+        sSheetNameRef = sSheetNameRef.replaceAt( 1, nSepPos - 1, aCalcName );
+}
+
+sal_Int16 WorksheetBuffer::getCalcSheetIndex( const OUString& rWorksheetName ) const
+{
+    const SheetInfo* pSheetInfo = maSheetInfosByName.get( rWorksheetName ).get();
+    return pSheetInfo ? pSheetInfo->mnCalcSheet : -1;
+}
+
+OUString WorksheetBuffer::getCalcSheetName( const OUString& rWorksheetName ) const
+{
+    if( const SheetInfo* pSheetInfo = maSheetInfosByName.get( rWorksheetName ).get() )
+    {
+        bool bIsQuoted = pSheetInfo->maName != rWorksheetName;
+        return bIsQuoted ? pSheetInfo->maCalcQuotedName : pSheetInfo->maCalcName;
+    }
+    return OUString();
+}
+
+// private --------------------------------------------------------------------
+
+namespace {
+
+OUString lclQuoteName( std::u16string_view rName )
+{
+    OUStringBuffer aBuffer( rName );
+    // duplicate all quote characters
+    for( sal_Int32 nPos = aBuffer.getLength() - 1; nPos >= 0; --nPos )
+        if( aBuffer[nPos] == '\'' )
+            aBuffer.insert( nPos, '\'' );
+    // add outer quotes and return
+    return aBuffer.insert( 0, '\'' ).append( '\'' ).makeStringAndClear();
+}
+
+} // namespace
+
+WorksheetBuffer::SheetInfo::SheetInfo( const SheetInfoModel& rModel, sal_Int16 nCalcSheet, const OUString& rCalcName ) :
+    SheetInfoModel( rModel ),
+    maCalcName( rCalcName ),
+    maCalcQuotedName( lclQuoteName( rCalcName ) ),
+    mnCalcSheet( nCalcSheet )
+{
+}
+
+WorksheetBuffer::IndexNamePair WorksheetBuffer::createSheet( const OUString& rPreferredName, sal_Int32 nSheetPos )
+{
+    //FIXME: Rewrite this block using ScDocument[Import] instead of UNO
+    try
+    {
+        Reference< XSpreadsheets > xSheets( getDocument()->getSheets(), UNO_SET_THROW );
+        Reference< XIndexAccess > xSheetsIA( xSheets, UNO_QUERY_THROW );
+        sal_Int16 nCalcSheet = -1;
+        OUString aSheetName = rPreferredName.isEmpty() ? ScResId(STR_TABLE_DEF) : rPreferredName;
+        if( nSheetPos < xSheetsIA->getCount() )
+        {
+            nCalcSheet = static_cast< sal_Int16 >( nSheetPos );
+            // existing sheet - try to rename
+            Reference< XNamed > xSheetName( xSheetsIA->getByIndex( nSheetPos ), UNO_QUERY_THROW );
+            if( xSheetName->getName() != aSheetName )
+            {
+                aSheetName = ContainerHelper::getUnusedName( xSheets, aSheetName, ' ' );
+                xSheetName->setName( aSheetName );
+            }
+        }
+        else
+        {
+            nCalcSheet = static_cast< sal_Int16 >( xSheetsIA->getCount() );
+            // new sheet - insert with unused name
+            aSheetName = ContainerHelper::getUnusedName( xSheets, aSheetName, ' ' );
+            xSheets->insertNewByName( aSheetName, nCalcSheet );
+        }
+
+        // return final sheet index if sheet exists
+        return IndexNamePair( nCalcSheet, aSheetName );
+    }
+    catch (const Exception&)
+    {
+        OSL_FAIL( "WorksheetBuffer::createSheet - cannot insert or rename worksheet" );
+    }
+    return IndexNamePair( -1, OUString() );
+}
+
+void WorksheetBuffer::insertSheet( const SheetInfoModel& rModel )
+{
+    sal_Int32 nWorksheet = static_cast< sal_Int32 >( maSheetInfos.size() );
+    IndexNamePair aIndexName = createSheet( rModel.maName, nWorksheet );
+    auto xSheetInfo = std::make_shared<SheetInfo>( rModel, aIndexName.first, aIndexName.second );
+    maSheetInfos.push_back( xSheetInfo );
+    maSheetInfosByName[ rModel.maName ] = xSheetInfo;
+    maSheetInfosByName[ lclQuoteName( rModel.maName ) ] = xSheetInfo;
+}
+
+void WorksheetBuffer::finalizeImport( sal_Int16 nActiveSheet )
+{
+    ScDocument& rDoc = getScDocument();
+
+    for ( const auto& aSheetInfo: maSheetInfos )
+    {
+        // make sure at least 1 sheet (the active one) is visible
+        if ( aSheetInfo->mnCalcSheet == nActiveSheet)
+            rDoc.SetVisible( aSheetInfo->mnCalcSheet, true );
+        else
+            rDoc.SetVisible( aSheetInfo->mnCalcSheet, aSheetInfo->mnState == XML_visible );
+    }
+}
+
+} // namespace oox::xls
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */