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diff --git a/writerfilter/source/ooxml/OOXMLStreamImpl.hxx b/writerfilter/source/ooxml/OOXMLStreamImpl.hxx
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+++ b/writerfilter/source/ooxml/OOXMLStreamImpl.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 <map>
+
+#include <ooxml/OOXMLDocument.hxx>
+#include <com/sun/star/embed/XRelationshipAccess.hpp>
+
+extern OUString customTarget;
+extern OUString embeddingsTarget;
+
+namespace writerfilter::ooxml
+{
+
+class OOXMLStreamImpl : public OOXMLStream
+{
+    void init();
+
+    css::uno::Reference<css::uno::XComponentContext> mxContext;
+    css::uno::Reference<css::io::XInputStream> mxStorageStream;
+    css::uno::Reference<css::embed::XStorage> mxStorage;
+    css::uno::Reference<css::embed::XRelationshipAccess> mxRelationshipAccess;
+    css::uno::Reference<css::io::XStream> mxDocumentStream;
+    css::uno::Reference<css::xml::sax::XFastParser> mxFastParser;
+    css::uno::Reference<css::xml::sax::XFastTokenHandler> mxFastTokenHandler;
+
+    StreamType_t mnStreamType;
+
+    OUString msId;
+    OUString msPath;
+    OUString msTarget;
+
+    /// Cache holding an Id <-> Target map of external relations.
+    std::map<OUString, OUString> maIdCache;
+
+    bool lcl_getTarget(const css::uno::Reference<css::embed::XRelationshipAccess>& xRelationshipAccess,
+                       StreamType_t nStreamType,
+                       const OUString & rId,
+                       OUString & rDocumentTarget);
+public:
+    typedef tools::SvRef<OOXMLStreamImpl> Pointer_t;
+
+    OOXMLStreamImpl
+    (OOXMLStreamImpl const & rStream, StreamType_t nType);
+    OOXMLStreamImpl
+    (css::uno::Reference<css::uno::XComponentContext> const & xContext,
+     css::uno::Reference<css::io::XInputStream> const & xStorageStream,
+     StreamType_t nType, bool bRepairStorage);
+    OOXMLStreamImpl(OOXMLStreamImpl const & rStream, const OUString & rId);
+
+    virtual ~OOXMLStreamImpl() override;
+
+    virtual css::uno::Reference<css::xml::sax::XFastParser> getFastParser() override;
+    virtual css::uno::Reference<css::io::XInputStream> getDocumentStream() override;
+    virtual css::uno::Reference<css::uno::XComponentContext> getContext() override;
+    virtual OUString getTargetForId(const OUString & rId) override;
+    virtual const OUString & getTarget() const override;
+
+    virtual css::uno::Reference<css::xml::sax::XFastTokenHandler> getFastTokenHandler() override;
+
+    // Giving access to mxDocumentStream. It is needed by resolving custom xml to get list of customxml's used in document.
+    const css::uno::Reference<css::io::XStream>& accessDocumentStream() { return mxDocumentStream;}
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */