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diff --git a/sc/source/filter/inc/worksheetbuffer.hxx b/sc/source/filter/inc/worksheetbuffer.hxx
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+++ b/sc/source/filter/inc/worksheetbuffer.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 <utility>
+#include <oox/helper/refmap.hxx>
+#include <oox/helper/refvector.hxx>
+#include "workbookhelper.hxx"
+
+namespace oox { class SequenceInputStream; }
+namespace oox { class AttributeList; }
+
+namespace oox::xls {
+
+/** Contains data from the 'sheet' element describing a sheet in the workbook. */
+struct SheetInfoModel
+{
+    OUString     maRelId;        /// Relation identifier for the sheet substream.
+    OUString     maName;         /// Original name of the sheet.
+    sal_Int32    mnSheetId;      /// Sheet identifier.
+    sal_Int32    mnState;        /// Visibility state.
+
+    explicit     SheetInfoModel();
+};
+
+/** Stores information about all sheets in a spreadsheet document.
+
+    Information about sheets includes the sheet name, the visibility state, and
+    for the OOXML filter, the relation identifier of the sheet used to obtain
+    the related worksheet fragment.
+ */
+class WorksheetBuffer : public WorkbookHelper
+{
+public:
+    explicit            WorksheetBuffer( const WorkbookHelper& rHelper );
+
+    /** Imports the attributes of a sheet element. */
+    void                importSheet( const AttributeList& rAttribs );
+    /** Imports the SHEET record from the passed BIFF12 stream. */
+    void                importSheet( SequenceInputStream& rStrm );
+    /** Inserts a new empty sheet into the document. Looks for an unused name.
+         @return  Index of the new sheet in the Calc document. */
+    sal_Int16           insertEmptySheet( const OUString& rPreferredName );
+
+    /** Returns the number of original sheets contained in the workbook. */
+    sal_Int32           getWorksheetCount() const;
+    /** Returns the number of all sheets, workbook + dummy ones (pivot table cache records ) */
+    sal_Int32           getAllSheetCount() const;
+    /** Returns the OOXML relation identifier of the specified worksheet. */
+    OUString     getWorksheetRelId( sal_Int32 nWorksheet ) const;
+
+    /** Returns the Calc index of the specified worksheet. */
+    sal_Int16           getCalcSheetIndex( sal_Int32 nWorksheet ) const;
+    /** Returns the finalized name of the specified worksheet. */
+    OUString     getCalcSheetName( sal_Int32 nWorksheet ) const;
+
+    /** Returns the Calc index of the sheet with the passed original worksheet name. */
+    sal_Int16           getCalcSheetIndex( const OUString& rWorksheetName ) const;
+    /** Returns the finalized name of the sheet with the passed worksheet name. */
+    OUString     getCalcSheetName( const OUString& rWorksheetName ) const;
+    /** Converts sSheetNameRef (e.g. '#SheetName!A1' to '#SheetName.A1' )
+        if sSheetNameRef doesn't start with '#' it is ignored and not modified
+    */
+    void                convertSheetNameRef( OUString& sSheetNameRef ) const;
+    void finalizeImport( sal_Int16 nActiveSheet );
+
+private:
+    struct SheetInfo : public SheetInfoModel
+    {
+        OUString            maCalcName;
+        OUString            maCalcQuotedName;
+        sal_Int16           mnCalcSheet;
+
+        explicit            SheetInfo( const SheetInfoModel& rModel, sal_Int16 nCalcSheet, const OUString& rCalcName );
+    };
+
+    typedef ::std::pair< sal_Int16, OUString > IndexNamePair;
+
+    /** Creates a new sheet in the Calc document. Does not insert anything in the own lists. */
+    IndexNamePair       createSheet( const OUString& rPreferredName, sal_Int32 nSheetPos );
+    /** Creates a new sheet in the Calc document and inserts the related SheetInfo. */
+    void                insertSheet( const SheetInfoModel& rModel );
+
+private:
+    RefVector< SheetInfo >  maSheetInfos;
+    RefMap< OUString, SheetInfo, IgnoreCaseCompare >  maSheetInfosByName;
+};
+
+} // namespace oox::xls
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */