filter/source/xsltfilter/OleHandler.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2
   3 /*
   4  * This file is part of the LibreOffice project.
   5  *
   6  * This Source Code Form is subject to the terms of the Mozilla Public
   7  * License, v. 2.0. If a copy of the MPL was not distributed with this
   8  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   9  */
  10
  11 #pragma once
  12 #include <cstdio>
  13 #include <cstring>
  14 #include <map>
  15 #include <string_view>
  16 #include <utility>
  17 #include <vector>
  18 #include <iostream>
  19 #include <libxml/parser.h>
  20 #include <libxml/tree.h>
  21 #include <libxml/xmlIO.h>
  22 #include <libxslt/transform.h>
  23 #include <libxslt/xsltutils.h>
  24 #include <libxslt/variables.h>
  25
  26 #include <cppuhelper/factory.hxx>
  27 #include <osl/module.h>
  28 #include <osl/file.hxx>
  29 #include <osl/process.h>
  30 #include <com/sun/star/lang/XComponent.hpp>
  31 #include <com/sun/star/lang/XInitialization.hpp>
  32 #include <com/sun/star/beans/NamedValue.hpp>
  33 #include <com/sun/star/container/XNameContainer.hpp>
  34 #include <com/sun/star/io/XInputStream.hpp>
  35 #include <com/sun/star/io/XOutputStream.hpp>
  36 #include <com/sun/star/io/XStream.hpp>
  37
  38 using namespace ::com::sun::star::uno;
  39 using namespace ::com::sun::star::lang;
  40 using namespace ::com::sun::star::container;
  41 using namespace ::com::sun::star::io;
  42
  43 namespace XSLT
  44 {
  45     /*
  46      * OleHandler provides implementations for the XSLT extension functions used by the WordML 2003 XSLT filters.
  47      *
  48      * The extension functions takes base64 encoded string representations of embedded OLE objects provided by the XML filter framework,
  49      * stores them into a com.sun.star.embed.OLESimpleStorage and retrieves them later as individual base64 OLE objects.
  50      *
  51      * The implementation is ported from the former Java based implementation XSLTOleExtrater (sic)
  52      *
  53      * I believe the whole thing should provide round-trip editing of embedded OLE objects.
  54      * I'm not sure if it currently does anything meaningful, because the Java implementation seems to be broken both in OOo and LibO.
  55      *
  56      */
  57     class OleHandler
  58     {
  59     public:
  60         OleHandler(css::uno::Reference<XComponentContext> xContext)
  61             : m_xContext(std::move(xContext))
  62             , m_tcontext(nullptr)
  63         {
  64         }
  65         ~OleHandler()
  66         {
  67             if (m_tcontext)
  68                 m_tcontext->_private = nullptr;
  69         }
  70         void    insertByName(const OUString& streamName, std::string_view content);
  71         OString getByName(const OUString& streamName);
  72         void registercontext(xsltTransformContextPtr context)
  73         {
  74             assert(context);
  75             m_tcontext = context;
  76             m_tcontext->_private = this;
  77         }
  78
  79     private:
  80         css::uno::Reference<XComponentContext> m_xContext;
  81         css::uno::Reference<XNameContainer> m_storage;
  82         css::uno::Reference<XStream> m_rootStream;
  83         xsltTransformContextPtr m_tcontext;
  84
  85         void    ensureCreateRootStorage();
  86         OString encodeSubStorage(const OUString& streamName);
  87         void    insertSubStorage(const OUString& streamName, std::string_view content);
  88         void    initRootStorageFromBase64(std::string_view content);
  89         css::uno::Reference<XStream> createTempFile();
  90     };
  91 }
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */