Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1484 insertions, 0 deletions

diff --git a/writerperfect/source/common/DirectoryStream.cxx b/writerperfect/source/common/DirectoryStream.cxx
new file mode 100644
index 000000000..28c38daa6
--- /dev/null
+++ b/writerperfect/source/common/DirectoryStream.cxx
@@ -0,0 +1,221 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* writerperfect
+ * Version: MPL 2.0 / LGPLv2.1+
+ *
+ * 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/.
+ *
+ * Major Contributor(s):
+ * Copyright (C) 2007 Fridrich Strba (fridrich.strba@bluewin.ch)
+ *
+ * For minor contributions see the git repository.
+ *
+ * Alternatively, the contents of this file may be used under the terms
+ * of the GNU Lesser General Public License Version 2.1 or later
+ * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are
+ * applicable instead of those above.
+ *
+ * For further information visit http://libwpd.sourceforge.net
+ */
+
+#include <memory>
+#include <com/sun/star/container/XChild.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/sdbc/XResultSet.hpp>
+#include <com/sun/star/sdbc/XRow.hpp>
+#include <com/sun/star/ucb/XContent.hpp>
+#include <com/sun/star/ucb/XContentAccess.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <comphelper/processfactory.hxx>
+
+#include <rtl/ustring.hxx>
+
+#include <ucbhelper/content.hxx>
+
+#include <DirectoryStream.hxx>
+#include <WPXSvInputStream.hxx>
+
+namespace io = com::sun::star::io;
+namespace sdbc = com::sun::star::sdbc;
+namespace ucb = com::sun::star::ucb;
+namespace uno = com::sun::star::uno;
+
+namespace writerperfect
+{
+namespace
+{
+uno::Reference<io::XInputStream> findStream(ucbhelper::Content& rContent, std::u16string_view rName)
+{
+    uno::Reference<io::XInputStream> xInputStream;
+
+    uno::Sequence<OUString> lPropNames{ "Title" };
+    try
+    {
+        const uno::Reference<sdbc::XResultSet> xResultSet(
+            rContent.createCursor(lPropNames, ucbhelper::INCLUDE_DOCUMENTS_ONLY));
+        if (xResultSet->first())
+        {
+            const uno::Reference<ucb::XContentAccess> xContentAccess(xResultSet,
+                                                                     uno::UNO_QUERY_THROW);
+            const uno::Reference<sdbc::XRow> xRow(xResultSet, uno::UNO_QUERY_THROW);
+            do
+            {
+                const OUString aTitle(xRow->getString(1));
+                if (aTitle == rName)
+                {
+                    const uno::Reference<ucb::XContent> xSubContent(xContentAccess->queryContent());
+                    ucbhelper::Content aSubContent(xSubContent,
+                                                   uno::Reference<ucb::XCommandEnvironment>(),
+                                                   comphelper::getProcessComponentContext());
+                    xInputStream = aSubContent.openStream();
+                    break;
+                }
+            } while (xResultSet->next());
+        }
+    }
+    catch (const uno::RuntimeException&)
+    {
+        // ignore
+    }
+    catch (const uno::Exception&)
+    {
+        // ignore
+    }
+
+    return xInputStream;
+}
+}
+
+struct DirectoryStream::Impl
+{
+    explicit Impl(const uno::Reference<ucb::XContent>& rxContent);
+
+    uno::Reference<ucb::XContent> xContent;
+};
+
+DirectoryStream::Impl::Impl(const uno::Reference<ucb::XContent>& rxContent)
+    : xContent(rxContent)
+{
+}
+
+DirectoryStream::DirectoryStream(const css::uno::Reference<css::ucb::XContent>& xContent)
+    : m_pImpl(isDirectory(xContent) ? new Impl(xContent) : nullptr)
+{
+}
+
+DirectoryStream::~DirectoryStream() {}
+
+bool DirectoryStream::isDirectory(const css::uno::Reference<css::ucb::XContent>& xContent)
+{
+    try
+    {
+        if (!xContent.is())
+            return false;
+
+        ucbhelper::Content aContent(xContent, uno::Reference<ucb::XCommandEnvironment>(),
+                                    comphelper::getProcessComponentContext());
+        return aContent.isFolder();
+    }
+    catch (...)
+    {
+        return false;
+    }
+}
+
+std::unique_ptr<DirectoryStream>
+DirectoryStream::createForParent(const css::uno::Reference<css::ucb::XContent>& xContent)
+{
+    try
+    {
+        if (!xContent.is())
+            return nullptr;
+
+        std::unique_ptr<DirectoryStream> pDir;
+
+        const uno::Reference<css::container::XChild> xChild(xContent, uno::UNO_QUERY);
+        if (xChild.is())
+        {
+            const uno::Reference<ucb::XContent> xDirContent(xChild->getParent(), uno::UNO_QUERY);
+            if (xDirContent.is())
+            {
+                pDir = std::make_unique<DirectoryStream>(xDirContent);
+                if (!pDir->isStructured())
+                    pDir.reset();
+            }
+        }
+
+        return pDir;
+    }
+    catch (...)
+    {
+        return nullptr;
+    }
+}
+
+css::uno::Reference<css::ucb::XContent> DirectoryStream::getContent() const
+{
+    if (!m_pImpl)
+        return css::uno::Reference<css::ucb::XContent>();
+    return m_pImpl->xContent;
+}
+
+bool DirectoryStream::isStructured() { return m_pImpl != nullptr; }
+
+unsigned DirectoryStream::subStreamCount()
+{
+    // TODO: implement me
+    return 0;
+}
+
+const char* DirectoryStream::subStreamName(unsigned /* id */)
+{
+    // TODO: implement me
+    return nullptr;
+}
+
+bool DirectoryStream::existsSubStream(const char* /* name */)
+{
+    // TODO: implement me
+    return false;
+}
+
+librevenge::RVNGInputStream* DirectoryStream::getSubStreamByName(const char* const pName)
+{
+    if (!m_pImpl)
+        return nullptr;
+
+    ucbhelper::Content aContent(m_pImpl->xContent, uno::Reference<ucb::XCommandEnvironment>(),
+                                comphelper::getProcessComponentContext());
+    const uno::Reference<io::XInputStream> xInputStream(
+        findStream(aContent, OUString::createFromAscii(pName)));
+    if (xInputStream.is())
+        return new WPXSvInputStream(xInputStream);
+
+    return nullptr;
+}
+
+librevenge::RVNGInputStream* DirectoryStream::getSubStreamById(unsigned /* id */)
+{
+    // TODO: implement me
+    return nullptr;
+}
+
+const unsigned char* DirectoryStream::read(unsigned long, unsigned long& nNumBytesRead)
+{
+    nNumBytesRead = 0;
+    return nullptr;
+}
+
+int DirectoryStream::seek(long, librevenge::RVNG_SEEK_TYPE) { return -1; }
+
+long DirectoryStream::tell() { return 0; }
+
+bool DirectoryStream::isEnd() { return true; }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/writerperfect/source/common/DocumentHandler.cxx b/writerperfect/source/common/DocumentHandler.cxx
new file mode 100644
index 000000000..6b5ffe58a
--- /dev/null
+++ b/writerperfect/source/common/DocumentHandler.cxx
@@ -0,0 +1,181 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ *
+ * For further information visit http://libwpd.sourceforge.net
+ */
+
+#include <DocumentHandler.hxx>
+
+#include <string.h>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XAttributeList.hpp>
+
+#include <xmloff/attrlist.hxx>
+#include <xmloff/xmlimp.hxx>
+
+namespace writerperfect
+{
+const unsigned char librvng_utf8_skip_data[256]
+    = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+        2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+        3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1 };
+
+static const char* librvng_utf8_next_char(const char* p)
+{
+    return p + librvng_utf8_skip_data[*reinterpret_cast<unsigned char const*>(p)];
+}
+
+static void unescapeXML(const char* s, const unsigned long sz, librevenge::RVNGString& res)
+{
+    const char* p = s;
+    const char* const end = p + sz;
+    while (p != end)
+    {
+        const char* const next = librvng_utf8_next_char(p);
+        if (next > end)
+        {
+            // oops, the string is invalid
+            break;
+        }
+        if (p + 4 <= end && p + 1 == next && *p == '&')
+        {
+            // look for &amp; , &lt; , &gt; , &apos; , &quot;
+            bool escapedChar = false;
+            switch (*(p + 1))
+            {
+                case 'a':
+                    if (p + 5 <= end && strncmp(p, "&amp;", 5) == 0)
+                    {
+                        res.append('&');
+                        p += 5;
+                        escapedChar = true;
+                    }
+                    else if (p + 6 <= end && strncmp(p, "&apos;", 6) == 0)
+                    {
+                        res.append('\'');
+                        p += 6;
+                        escapedChar = true;
+                    }
+                    break;
+                case 'g':
+                    if (strncmp(p, "&gt;", 4) == 0)
+                    {
+                        res.append('>');
+                        p += 4;
+                        escapedChar = true;
+                    }
+                    break;
+                case 'l':
+                    if (strncmp(p, "&lt;", 4) == 0)
+                    {
+                        res.append('<');
+                        p += 4;
+                        escapedChar = true;
+                    }
+                    break;
+                case 'q':
+                    if (p + 6 <= end && strncmp(p, "&quot;", 6) == 0)
+                    {
+                        res.append('"');
+                        p += 6;
+                        escapedChar = true;
+                    }
+                    break;
+                default:
+                    break;
+            }
+            if (escapedChar)
+                continue;
+        }
+
+        while (p != next)
+        {
+            res.append(*p);
+            ++p;
+        }
+        p = next;
+    }
+}
+
+using com::sun::star::uno::Reference;
+using com::sun::star::xml::sax::XAttributeList;
+using com::sun::star::xml::sax::XDocumentHandler;
+
+DocumentHandler::DocumentHandler(Reference<XDocumentHandler> const& xHandler)
+    : mxHandler(xHandler)
+{
+    if (SvXMLImport* pFastHandler = dynamic_cast<SvXMLImport*>(mxHandler.get()))
+        mxHandler.set(new SvXMLLegacyToFastDocHandler(pFastHandler));
+}
+
+void DocumentHandler::startDocument() { mxHandler->startDocument(); }
+
+void DocumentHandler::endDocument() { mxHandler->endDocument(); }
+
+void DocumentHandler::startElement(const char* psName,
+                                   const librevenge::RVNGPropertyList& xPropList)
+{
+    rtl::Reference<SvXMLAttributeList> pAttrList = new SvXMLAttributeList();
+    librevenge::RVNGPropertyList::Iter i(xPropList);
+    for (i.rewind(); i.next();)
+    {
+        // filter out librevenge elements
+        if (strncmp(i.key(), "librevenge", 10) != 0)
+        {
+            size_t keyLength = strlen(i.key());
+            OUString sName(i.key(), keyLength, RTL_TEXTENCODING_UTF8);
+            OUString sValue(i()->getStr().cstr(), i()->getStr().len(), RTL_TEXTENCODING_UTF8);
+
+            // libodfgen xml-encodes some attribute's value, so check if the value is encoded or not
+            for (int j = 0; j < 9; ++j)
+            {
+                // list of the encoded attributes followed by their lengths
+                static char const* listEncoded[9]
+                    = { "draw:name",        "svg:font-family",  "style:condition",
+                        "style:num-prefix", "style:num-suffix", "table:formula",
+                        "text:bullet-char", "text:label",       "xlink:href" };
+                static size_t const listEncodedLength[9] = { 9, 15, 15, 16, 16, 13, 16, 10, 10 };
+                if (keyLength == listEncodedLength[j]
+                    && strncmp(i.key(), listEncoded[j], keyLength) == 0)
+                {
+                    librevenge::RVNGString decodedValue("");
+                    unescapeXML(i()->getStr().cstr(),
+                                static_cast<unsigned long>(i()->getStr().len()), decodedValue);
+                    sValue
+                        = OUString(decodedValue.cstr(), decodedValue.len(), RTL_TEXTENCODING_UTF8);
+                    break;
+                }
+            }
+            pAttrList->AddAttribute(sName, sValue);
+        }
+    }
+
+    OUString sElementName(psName, strlen(psName), RTL_TEXTENCODING_UTF8);
+    mxHandler->startElement(sElementName, pAttrList);
+}
+
+void DocumentHandler::endElement(const char* psName)
+{
+    OUString sElementName(psName, strlen(psName), RTL_TEXTENCODING_UTF8);
+    mxHandler->endElement(sElementName);
+}
+
+void DocumentHandler::characters(const librevenge::RVNGString& sCharacters)
+{
+    OUString sCharU16(sCharacters.cstr(), strlen(sCharacters.cstr()), RTL_TEXTENCODING_UTF8);
+    mxHandler->characters(sCharU16);
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/writerperfect/source/common/WPFTEncodingDialog.cxx b/writerperfect/source/common/WPFTEncodingDialog.cxx
new file mode 100644
index 000000000..b0c955481
--- /dev/null
+++ b/writerperfect/source/common/WPFTEncodingDialog.cxx
@@ -0,0 +1,122 @@
+/* -*- 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 <cstddef>
+#include <string_view>
+#include <utility>
+
+#include <WPFTEncodingDialog.hxx>
+
+namespace writerperfect
+{
+namespace
+{
+std::pair<std::u16string_view, std::u16string_view> const s_encodings[]
+    = { { u"MacArabic", u"Arabic (Apple Macintosh)" },
+        { u"CP864", u"Arabic (DOS/OS2-864)" },
+        { u"CP1006", u"Arabic (IBM-1006)" },
+        { u"CP1256", u"Arabic (Windows-1256)" },
+        { u"CP775", u"Baltic (DOS/OS2-775)" },
+        { u"CP1257", u"Baltic (Windows-1257)" },
+        { u"MacCeltic", u"Celtic (Apple Macintosh)" },
+        { u"MacCyrillic", u"Cyrillic (Apple Macintosh)" },
+        { u"CP855", u"Cyrillic (DOS/OS2-855)" },
+        { u"CP866", u"Cyrillic (DOS/OS2-866/Russian)" },
+        { u"CP1251", u"Cyrillic (Windows-1251)" },
+        { u"MacCEurope", u"Eastern Europe (Apple Macintosh)" },
+        { u"MacCroatian", u"Eastern Europe (Apple Macintosh/Croatian)" },
+        { u"MacRomanian", u"Eastern Europe (Apple Macintosh/Romanian)" },
+        { u"CP852", u"Eastern Europe (DOS/OS2-852)" },
+        { u"CP1250", u"Eastern Europe (Windows-1250/WinLatin 2)" },
+        { u"MacGreek", u"Greek (Apple Macintosh)" },
+        { u"CP737", u"Greek (DOS/OS2-737)" },
+        { u"CP869", u"Greek (DOS/OS2-869/Greek-2)" },
+        { u"CP875", u"Greek (DOS/OS2-875)" },
+        { u"CP1253", u"Greek (Windows-1253)" },
+        { u"MacHebrew", u"Hebrew (Apple Macintosh)" },
+        { u"CP424", u"Hebrew (DOS/OS2-424)" },
+        { u"CP856", u"Hebrew (DOS/OS2-856)" },
+        { u"CP862", u"Hebrew (DOS/OS2-862)" },
+        { u"CP1255", u"Hebrew (Windows-1255)" },
+        { u"CP500", u"International (DOS/OS2-500)" },
+        { u"CP932", u"Japanese (Windows-932)" },
+        { u"MacThai", u"Thai (Apple Macintosh)" },
+        { u"CP874", u"Thai (DOS/OS2-874)" },
+        { u"CP950", u"Traditional Chinese (Windows-950)" },
+        { u"MacTurkish", u"Turkish (Apple Macintosh)" },
+        { u"CP857", u"Turkish (DOS/OS2-857)" },
+        { u"CP1026", u"Turkish (DOS/OS2-1026)" },
+        { u"CP1254", u"Turkish (Windows-1254)" },
+        { u"CP1258", u"Vietnamese (Windows-1258)" },
+        { u"MacRoman", u"Western Europe (Apple Macintosh)" },
+        { u"MacIceland", u"Western Europe (Apple Macintosh/Icelandic)" },
+        { u"CP037", u"Western Europe (DOS/OS2-037/US-Canada)" },
+        { u"CP437", u"Western Europe (DOS/OS2-437/US)" },
+        { u"CP850", u"Western Europe (DOS/OS2-850)" },
+        { u"CP860", u"Western Europe (DOS/OS2-860/Portuguese)" },
+        { u"CP861", u"Western Europe (DOS/OS2-861/Icelandic)" },
+        { u"CP863", u"Western Europe (DOS/OS2-863/French)" },
+        { u"CP865", u"Western Europe (DOS/OS2-865/Nordic)" },
+        { u"CP1252", u"Western Europe (Windows-1252/WinLatin 1)" } };
+
+std::size_t const numEncodings = SAL_N_ELEMENTS(s_encodings);
+
+void insertEncodings(weld::ComboBox& box)
+{
+    for (std::size_t i = 0; i < numEncodings; ++i)
+        box.append(OUString(s_encodings[i].first), OUString(s_encodings[i].second));
+}
+
+void selectEncoding(weld::ComboBox& box, const OUString& encoding) { box.set_active_id(encoding); }
+
+OUString getEncoding(const weld::ComboBox& box) { return box.get_active_id(); }
+}
+
+WPFTEncodingDialog::WPFTEncodingDialog(weld::Window* pParent, const OUString& title,
+                                       const OUString& encoding)
+    : GenericDialogController(pParent, "writerperfect/ui/wpftencodingdialog.ui",
+                              "WPFTEncodingDialog")
+    , m_userHasCancelled(false)
+    , m_xLbCharset(m_xBuilder->weld_combo_box("comboboxtext"))
+    , m_xBtnOk(m_xBuilder->weld_button("ok"))
+    , m_xBtnCancel(m_xBuilder->weld_button("cancel"))
+{
+    m_xBtnCancel->connect_clicked(LINK(this, WPFTEncodingDialog, CancelHdl));
+
+    insertEncodings(*m_xLbCharset);
+    m_xLbCharset->make_sorted();
+    selectEncoding(*m_xLbCharset, encoding);
+
+    m_xDialog->set_title(title);
+}
+
+WPFTEncodingDialog::~WPFTEncodingDialog() {}
+
+OUString WPFTEncodingDialog::GetEncoding() const { return getEncoding(*m_xLbCharset); }
+
+IMPL_LINK_NOARG(WPFTEncodingDialog, CancelHdl, weld::Button&, void)
+{
+    m_userHasCancelled = true;
+    m_xDialog->response(RET_CANCEL);
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/writerperfect/source/common/WPXSvInputStream.cxx b/writerperfect/source/common/WPXSvInputStream.cxx
new file mode 100644
index 000000000..3364b0509
--- /dev/null
+++ b/writerperfect/source/common/WPXSvInputStream.cxx
@@ -0,0 +1,960 @@
+/* -*- 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/.
+ */
+
+#include <WPXSvInputStream.hxx>
+
+#include <com/sun/star/packages/zip/XZipFileAccess2.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <comphelper/processfactory.hxx>
+#include <comphelper/seekableinput.hxx>
+#include <o3tl/safeint.hxx>
+#include <rtl/string.hxx>
+#include <sal/log.hxx>
+
+#include <sot/storage.hxx>
+
+#include <tools/stream.hxx>
+#include <unotools/streamwrap.hxx>
+#include <unotools/ucbstreamhelper.hxx>
+
+#include <climits>
+#include <limits>
+#include <memory>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+namespace writerperfect
+{
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+
+namespace container = com::sun::star::container;
+namespace packages = com::sun::star::packages;
+
+namespace
+{
+class PositionHolder
+{
+public:
+    explicit PositionHolder(const Reference<XSeekable>& rxSeekable);
+    ~PositionHolder();
+    PositionHolder(const PositionHolder&) = delete;
+    PositionHolder& operator=(const PositionHolder&) = delete;
+
+private:
+    const Reference<XSeekable> mxSeekable;
+    const sal_uInt64 mnPosition;
+};
+
+PositionHolder::PositionHolder(const Reference<XSeekable>& rxSeekable)
+    : mxSeekable(rxSeekable)
+    , mnPosition(rxSeekable->getPosition())
+{
+}
+
+PositionHolder::~PositionHolder()
+{
+    try
+    {
+        mxSeekable->seek(mnPosition);
+    }
+    catch (...)
+    {
+    }
+}
+
+} // anonymous namespace
+
+namespace
+{
+OUString lcl_normalizeSubStreamPath(const OUString& rPath)
+{
+    // accept paths which begin by '/'
+    // TODO: maybe this should do a full normalization
+    if (rPath.startsWith("/") && rPath.getLength() >= 2)
+        return rPath.copy(1);
+    return rPath;
+}
+}
+
+namespace
+{
+OUString concatPath(std::u16string_view lhs, const OUString& rhs)
+{
+    if (lhs.empty())
+        return rhs;
+    return OUString::Concat(lhs) + "/" + rhs;
+}
+
+struct OLEStreamData
+{
+    OLEStreamData(const OString& rName, const OString& rvngName);
+
+    tools::SvRef<SotStorageStream> stream;
+
+    /** Name of the stream.
+      *
+      * This is not @c OUString, because we need to be able to
+      * produce const char* from it.
+      */
+    OString name;
+    /** librevenge name of the stream.
+      *
+      * This is not @c OUString, because we need to be able to
+      * produce const char* from it.
+      */
+    OString RVNGname;
+};
+
+typedef std::unordered_map<OUString, std::size_t> NameMap_t;
+typedef std::unordered_map<OUString, tools::SvRef<SotStorage>> OLEStorageMap_t;
+
+/** Representation of an OLE2 storage.
+  *
+  * This class tries to bring a bit of sanity to use of SotStorage with
+  * respect to the needs of @c librevenge::RVNGInputStream API. It
+  * holds all nested storages for the whole lifetime (more precisely,
+  * since initialization, which is performed by calling @c
+  * initialize()), thus ensuring that no created stream is destroyed
+  * just because its parent storage went out of scope. It also holds a
+  * bidirectional map of stream names to their indexes (index of a
+  * stream is determined by deep-first traversal), which is also
+  * populated during initialization (member variables @c maStreams and
+  * @c maNameMap).
+  *
+  * Streams are created on demand (and saved, for the same reason as
+  * storages).
+  */
+struct OLEStorageImpl
+{
+    OLEStorageImpl();
+
+    void initialize(std::unique_ptr<SvStream> pStream);
+
+    tools::SvRef<SotStorageStream> getStream(const OUString& rPath);
+    tools::SvRef<SotStorageStream> const& getStream(std::size_t nId);
+
+private:
+    void traverse(const tools::SvRef<SotStorage>& rStorage, std::u16string_view rPath);
+
+    tools::SvRef<SotStorageStream> createStream(const OUString& rPath);
+
+public:
+    tools::SvRef<SotStorage> mxRootStorage; //< root storage of the OLE2
+    OLEStorageMap_t maStorageMap; //< map of all sub storages by name
+    ::std::vector<OLEStreamData> maStreams; //< list of streams and their names
+    NameMap_t maNameMap; //< map of stream names to indexes (into @c maStreams)
+    bool mbInitialized;
+};
+
+OLEStreamData::OLEStreamData(const OString& rName, const OString& rvngName)
+    : name(rName)
+    , RVNGname(rvngName)
+{
+}
+
+OLEStorageImpl::OLEStorageImpl()
+    : mbInitialized(false)
+{
+}
+
+void OLEStorageImpl::initialize(std::unique_ptr<SvStream> pStream)
+{
+    if (!pStream)
+        return;
+
+    mxRootStorage = new SotStorage(pStream.release(), true);
+
+    traverse(mxRootStorage, u"");
+
+    mbInitialized = true;
+}
+
+tools::SvRef<SotStorageStream> OLEStorageImpl::getStream(const OUString& rPath)
+{
+    const OUString aPath(lcl_normalizeSubStreamPath(rPath));
+    NameMap_t::iterator aIt = maNameMap.find(aPath);
+
+    // For the while don't return stream in this situation.
+    // Later, given how libcdr's zip stream implementation behaves,
+    // return the first stream in the storage if there is one.
+    if (maNameMap.end() == aIt)
+        return tools::SvRef<SotStorageStream>();
+
+    if (!maStreams[aIt->second].stream.is())
+        maStreams[aIt->second].stream
+            = createStream(OStringToOUString(maStreams[aIt->second].name, RTL_TEXTENCODING_UTF8));
+
+    return maStreams[aIt->second].stream;
+}
+
+tools::SvRef<SotStorageStream> const& OLEStorageImpl::getStream(const std::size_t nId)
+{
+    if (!maStreams[nId].stream.is())
+        maStreams[nId].stream
+            = createStream(OStringToOUString(maStreams[nId].name, RTL_TEXTENCODING_UTF8));
+
+    return maStreams[nId].stream;
+}
+
+void OLEStorageImpl::traverse(const tools::SvRef<SotStorage>& rStorage, std::u16string_view rPath)
+{
+    SvStorageInfoList infos;
+
+    rStorage->FillInfoList(&infos);
+
+    for (const auto& info : infos)
+    {
+        if (info.IsStream())
+        {
+            OUString baseName = info.GetName(), rvngName = baseName;
+            // librevenge::RVNGOLEStream ignores the first character when is a control code, so ...
+            if (!rvngName.isEmpty() && rvngName.toChar() < 32)
+                rvngName = rvngName.copy(1);
+            maStreams.emplace_back(
+                OUStringToOString(concatPath(rPath, baseName), RTL_TEXTENCODING_UTF8),
+                OUStringToOString(concatPath(rPath, rvngName), RTL_TEXTENCODING_UTF8));
+            maNameMap[concatPath(rPath, rvngName)] = maStreams.size() - 1;
+        }
+        else if (info.IsStorage())
+        {
+            const OUString aPath = concatPath(rPath, info.GetName());
+            tools::SvRef<SotStorage> aStorage
+                = rStorage->OpenSotStorage(info.GetName(), StreamMode::STD_READ);
+            maStorageMap[aPath] = aStorage;
+
+            // deep-first traversal
+            traverse(aStorage, aPath);
+        }
+        else
+        {
+            SAL_WARN("writerperfect",
+                     "OLEStorageImpl::traverse: invalid storage entry, neither stream nor file");
+        }
+    }
+}
+
+tools::SvRef<SotStorageStream> OLEStorageImpl::createStream(const OUString& rPath)
+{
+    const sal_Int32 nDelim = rPath.lastIndexOf(u'/');
+
+    if (-1 == nDelim)
+        return mxRootStorage->OpenSotStream(rPath, StreamMode::STD_READ);
+
+    const OUString aDir = rPath.copy(0, nDelim);
+    const OUString aName = rPath.copy(nDelim + 1);
+
+    const OLEStorageMap_t::const_iterator aIt = maStorageMap.find(aDir);
+
+    if (maStorageMap.end() == aIt)
+        return nullptr;
+
+    return aIt->second->OpenSotStream(aName, StreamMode::STD_READ);
+}
+}
+
+namespace
+{
+struct ZipStreamData
+{
+    explicit ZipStreamData(const OString& rName);
+
+    Reference<XInputStream> xStream;
+
+    /** Name of the stream.
+      *
+      * This is not @c OUString, because we need to be able to
+      * produce const char* from it.
+      */
+    OString aName;
+};
+
+/** Representation of a Zip storage.
+  *
+  * This is quite similar to OLEStorageImpl, except that we do not need
+  * to keep all storages (folders) open.
+  */
+struct ZipStorageImpl
+{
+    explicit ZipStorageImpl(const Reference<container::XNameAccess>& rxContainer);
+
+    /** Initialize for access.
+      *
+      * This creates a bidirectional map of stream names to their
+      * indexes (index of a stream is determined by deep-first
+      * traversal).
+      */
+    void initialize();
+
+    Reference<XInputStream> getStream(const OUString& rPath);
+    Reference<XInputStream> const& getStream(std::size_t nId);
+
+private:
+    void traverse(const Reference<container::XNameAccess>& rxEnum);
+
+    Reference<XInputStream> createStream(const OUString& rPath);
+
+public:
+    Reference<container::XNameAccess> mxContainer; //< root of the Zip
+    ::std::vector<ZipStreamData> maStreams; //< list of streams and their names
+    NameMap_t maNameMap; //< map of stream names to indexes (into @c maStreams)
+    bool mbInitialized;
+};
+
+ZipStreamData::ZipStreamData(const OString& rName)
+    : aName(rName)
+{
+}
+
+ZipStorageImpl::ZipStorageImpl(const Reference<container::XNameAccess>& rxContainer)
+    : mxContainer(rxContainer)
+    , mbInitialized(false)
+{
+    assert(mxContainer.is());
+}
+
+void ZipStorageImpl::initialize()
+{
+    traverse(mxContainer);
+
+    mbInitialized = true;
+}
+
+Reference<XInputStream> ZipStorageImpl::getStream(const OUString& rPath)
+{
+    const OUString aPath(lcl_normalizeSubStreamPath(rPath));
+    NameMap_t::iterator aIt = maNameMap.find(aPath);
+
+    // For the while don't return stream in this situation.
+    // Later, given how libcdr's zip stream implementation behaves,
+    // return the first stream in the storage if there is one.
+    if (maNameMap.end() == aIt)
+        return Reference<XInputStream>();
+
+    if (!maStreams[aIt->second].xStream.is())
+        maStreams[aIt->second].xStream = createStream(aPath);
+
+    return maStreams[aIt->second].xStream;
+}
+
+Reference<XInputStream> const& ZipStorageImpl::getStream(const std::size_t nId)
+{
+    if (!maStreams[nId].xStream.is())
+        maStreams[nId].xStream
+            = createStream(OStringToOUString(maStreams[nId].aName, RTL_TEXTENCODING_UTF8));
+
+    return maStreams[nId].xStream;
+}
+
+void ZipStorageImpl::traverse(const Reference<container::XNameAccess>& rxContainer)
+{
+    const Sequence<OUString> lNames = rxContainer->getElementNames();
+
+    maStreams.reserve(lNames.getLength());
+
+    for (const auto& rName : lNames)
+    {
+        if (!rName.endsWith("/")) // skip dirs
+        {
+            maStreams.emplace_back(OUStringToOString(rName, RTL_TEXTENCODING_UTF8));
+            maNameMap[rName] = maStreams.size() - 1;
+        }
+    }
+}
+
+Reference<XInputStream> ZipStorageImpl::createStream(const OUString& rPath)
+{
+    Reference<XInputStream> xStream;
+
+    try
+    {
+        const Reference<XInputStream> xInputStream(mxContainer->getByName(rPath), UNO_QUERY_THROW);
+        const Reference<XSeekable> xSeekable(xInputStream, UNO_QUERY);
+
+        if (xSeekable.is())
+            xStream = xInputStream;
+        else
+            xStream.set(new comphelper::OSeekableInputWrapper(
+                xInputStream, comphelper::getProcessComponentContext()));
+    }
+    catch (const Exception&)
+    {
+        // nothing needed
+    }
+
+    return xStream;
+}
+}
+
+class WPXSvInputStreamImpl
+{
+public:
+    explicit WPXSvInputStreamImpl(css::uno::Reference<css::io::XInputStream> const& xStream);
+
+    bool isStructured();
+    unsigned subStreamCount();
+    const char* subStreamName(unsigned id);
+    bool existsSubStream(const char* name);
+    librevenge::RVNGInputStream* getSubStreamByName(const char* name);
+    librevenge::RVNGInputStream* getSubStreamById(unsigned id);
+
+    const unsigned char* read(unsigned long numBytes, unsigned long& numBytesRead);
+    int seek(tools::Long offset);
+    tools::Long tell();
+    bool isEnd();
+
+    void invalidateReadBuffer();
+
+private:
+    bool isOLE();
+    void ensureOLEIsInitialized();
+
+    bool isZip();
+    void ensureZipIsInitialized();
+
+    static librevenge::RVNGInputStream*
+    createWPXStream(const tools::SvRef<SotStorageStream>& rxStorage);
+    static librevenge::RVNGInputStream* createWPXStream(const Reference<XInputStream>& rxStream);
+
+private:
+    css::uno::Reference<css::io::XInputStream> mxStream;
+    css::uno::Reference<css::io::XSeekable> mxSeekable;
+    css::uno::Sequence<sal_Int8> maData;
+    std::unique_ptr<OLEStorageImpl> mpOLEStorage;
+    std::unique_ptr<ZipStorageImpl> mpZipStorage;
+    bool mbCheckedOLE;
+    bool mbCheckedZip;
+
+public:
+    sal_Int64 mnLength;
+    const unsigned char* mpReadBuffer;
+    unsigned long mnReadBufferLength;
+    unsigned long mnReadBufferPos;
+};
+
+WPXSvInputStreamImpl::WPXSvInputStreamImpl(Reference<XInputStream> const& xStream)
+    : mxStream(xStream)
+    , mxSeekable(xStream, UNO_QUERY)
+    , maData(0)
+    , mbCheckedOLE(false)
+    , mbCheckedZip(false)
+    , mnLength(0)
+    , mpReadBuffer(nullptr)
+    , mnReadBufferLength(0)
+    , mnReadBufferPos(0)
+{
+    if (!xStream.is() || !mxStream.is())
+        mnLength = 0;
+    else
+    {
+        if (!mxSeekable.is())
+            mnLength = 0;
+        else
+        {
+            try
+            {
+                mnLength = mxSeekable->getLength();
+                if (0 < mxSeekable->getPosition())
+                    mxSeekable->seek(0);
+            }
+            catch (...)
+            {
+                SAL_WARN("writerperfect", "mnLength = mxSeekable->getLength() threw exception");
+                mnLength = 0;
+            }
+        }
+    }
+}
+
+const unsigned char* WPXSvInputStreamImpl::read(unsigned long numBytes, unsigned long& numBytesRead)
+{
+    numBytesRead = 0;
+
+    if (numBytes == 0 || isEnd())
+        return nullptr;
+
+    numBytesRead = mxStream->readSomeBytes(maData, numBytes);
+    if (numBytesRead == 0)
+        return nullptr;
+
+    return reinterpret_cast<const unsigned char*>(maData.getConstArray());
+}
+
+tools::Long WPXSvInputStreamImpl::tell()
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return -1;
+    else
+    {
+        const sal_Int64 tmpPosition = mxSeekable->getPosition();
+        if ((tmpPosition < 0) || (tmpPosition > LONG_MAX))
+            return -1;
+        return static_cast<tools::Long>(tmpPosition);
+    }
+}
+
+int WPXSvInputStreamImpl::seek(tools::Long offset)
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return -1;
+
+    const sal_Int64 tmpPosition = mxSeekable->getPosition();
+    if ((tmpPosition < 0) || (tmpPosition > LONG_MAX))
+        return -1;
+
+    try
+    {
+        mxSeekable->seek(offset);
+        return 0;
+    }
+    catch (...)
+    {
+        SAL_WARN("writerperfect", "mxSeekable->seek(offset) threw exception");
+        return -1;
+    }
+}
+
+bool WPXSvInputStreamImpl::isEnd()
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return true;
+    return (mxSeekable->getPosition() >= mnLength);
+}
+
+bool WPXSvInputStreamImpl::isStructured()
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return false;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    if (isOLE())
+        return true;
+
+    mxSeekable->seek(0);
+
+    return isZip();
+}
+
+unsigned WPXSvInputStreamImpl::subStreamCount()
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return 0;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    if (isOLE())
+    {
+        ensureOLEIsInitialized();
+
+        return mpOLEStorage->maStreams.size();
+    }
+
+    mxSeekable->seek(0);
+
+    if (isZip())
+    {
+        ensureZipIsInitialized();
+
+        return mpZipStorage->maStreams.size();
+    }
+
+    return 0;
+}
+
+const char* WPXSvInputStreamImpl::subStreamName(const unsigned id)
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return nullptr;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    if (isOLE())
+    {
+        ensureOLEIsInitialized();
+
+        if (mpOLEStorage->maStreams.size() <= id)
+            return nullptr;
+
+        return mpOLEStorage->maStreams[id].RVNGname.getStr();
+    }
+
+    mxSeekable->seek(0);
+
+    if (isZip())
+    {
+        ensureZipIsInitialized();
+
+        if (mpZipStorage->maStreams.size() <= id)
+            return nullptr;
+
+        return mpZipStorage->maStreams[id].aName.getStr();
+    }
+
+    return nullptr;
+}
+
+bool WPXSvInputStreamImpl::existsSubStream(const char* const name)
+{
+    if (!name)
+        return false;
+
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return false;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    const OUString aName(OStringToOUString(std::string_view(name), RTL_TEXTENCODING_UTF8));
+
+    if (isOLE())
+    {
+        ensureOLEIsInitialized();
+        return mpOLEStorage->maNameMap.end() != mpOLEStorage->maNameMap.find(aName);
+    }
+
+    mxSeekable->seek(0);
+
+    if (isZip())
+    {
+        ensureZipIsInitialized();
+        return mpZipStorage->maNameMap.end() != mpZipStorage->maNameMap.find(aName);
+    }
+
+    return false;
+}
+
+librevenge::RVNGInputStream* WPXSvInputStreamImpl::getSubStreamByName(const char* const name)
+{
+    if (!name)
+        return nullptr;
+
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return nullptr;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    const OUString aName(OStringToOUString(std::string_view(name), RTL_TEXTENCODING_UTF8));
+
+    if (isOLE())
+    {
+        ensureOLEIsInitialized();
+        return createWPXStream(mpOLEStorage->getStream(aName));
+    }
+
+    mxSeekable->seek(0);
+
+    if (isZip())
+    {
+        ensureZipIsInitialized();
+
+        try
+        {
+            return createWPXStream(mpZipStorage->getStream(aName));
+        }
+        catch (const Exception&)
+        {
+            // nothing needed
+        }
+    }
+
+    return nullptr;
+}
+
+librevenge::RVNGInputStream* WPXSvInputStreamImpl::getSubStreamById(const unsigned id)
+{
+    if ((mnLength == 0) || !mxStream.is() || !mxSeekable.is())
+        return nullptr;
+
+    PositionHolder pos(mxSeekable);
+    mxSeekable->seek(0);
+
+    if (isOLE())
+    {
+        ensureOLEIsInitialized();
+
+        if (mpOLEStorage->maStreams.size() <= id)
+            return nullptr;
+
+        return createWPXStream(mpOLEStorage->getStream(id));
+    }
+
+    mxSeekable->seek(0);
+
+    if (isZip())
+    {
+        ensureZipIsInitialized();
+
+        if (mpZipStorage->maStreams.size() <= id)
+            return nullptr;
+
+        try
+        {
+            return createWPXStream(mpZipStorage->getStream(id));
+        }
+        catch (const Exception&)
+        {
+            // nothing needed
+        }
+    }
+    return nullptr;
+}
+
+void WPXSvInputStreamImpl::invalidateReadBuffer()
+{
+    if (mpReadBuffer)
+    {
+        seek(tell() + static_cast<tools::Long>(mnReadBufferPos)
+             - static_cast<tools::Long>(mnReadBufferLength));
+        mpReadBuffer = nullptr;
+        mnReadBufferPos = 0;
+        mnReadBufferLength = 0;
+    }
+}
+
+librevenge::RVNGInputStream*
+WPXSvInputStreamImpl::createWPXStream(const tools::SvRef<SotStorageStream>& rxStorage)
+{
+    if (rxStorage.is())
+    {
+        Reference<XInputStream> xContents(new utl::OSeekableInputStreamWrapper(rxStorage.get()));
+        return new WPXSvInputStream(xContents);
+    }
+    return nullptr;
+}
+
+librevenge::RVNGInputStream*
+WPXSvInputStreamImpl::createWPXStream(const Reference<XInputStream>& rxStream)
+{
+    if (rxStream.is())
+        return new WPXSvInputStream(rxStream);
+    else
+        return nullptr;
+}
+
+bool WPXSvInputStreamImpl::isOLE()
+{
+    if (!mbCheckedOLE)
+    {
+        assert(0 == mxSeekable->getPosition());
+
+        std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(mxStream));
+        if (pStream && SotStorage::IsOLEStorage(pStream.get()))
+            mpOLEStorage.reset(new OLEStorageImpl());
+
+        mbCheckedOLE = true;
+    }
+
+    return bool(mpOLEStorage);
+}
+
+bool WPXSvInputStreamImpl::isZip()
+{
+    if (!mbCheckedZip)
+    {
+        assert(0 == mxSeekable->getPosition());
+
+        try
+        {
+            const Reference<XComponentContext> xContext(comphelper::getProcessComponentContext(),
+                                                        UNO_SET_THROW);
+            const Reference<packages::zip::XZipFileAccess2> xZip(
+                xContext->getServiceManager()->createInstanceWithArgumentsAndContext(
+                    "com.sun.star.packages.zip.ZipFileAccess", { Any(mxStream) }, xContext),
+                UNO_QUERY_THROW);
+            mpZipStorage.reset(new ZipStorageImpl(xZip));
+        }
+        catch (const Exception&)
+        {
+            // ignore
+        }
+
+        mbCheckedZip = true;
+    }
+
+    return bool(mpZipStorage);
+}
+
+void WPXSvInputStreamImpl::ensureOLEIsInitialized()
+{
+    assert(mpOLEStorage);
+
+    if (!mpOLEStorage->mbInitialized)
+        mpOLEStorage->initialize(utl::UcbStreamHelper::CreateStream(mxStream));
+}
+
+void WPXSvInputStreamImpl::ensureZipIsInitialized()
+{
+    assert(mpZipStorage);
+
+    if (!mpZipStorage->mbInitialized)
+        mpZipStorage->initialize();
+}
+
+WPXSvInputStream::WPXSvInputStream(Reference<XInputStream> const& xStream)
+    : mpImpl(new WPXSvInputStreamImpl(xStream))
+{
+}
+
+WPXSvInputStream::~WPXSvInputStream() {}
+
+#define BUFFER_MAX 65536
+
+const unsigned char* WPXSvInputStream::read(unsigned long numBytes, unsigned long& numBytesRead)
+{
+    numBytesRead = 0;
+
+    if (numBytes == 0 || numBytes > std::numeric_limits<unsigned long>::max() / 2)
+        return nullptr;
+
+    if (mpImpl->mpReadBuffer)
+    {
+        if ((mpImpl->mnReadBufferPos + numBytes > mpImpl->mnReadBufferPos)
+            && (mpImpl->mnReadBufferPos + numBytes <= mpImpl->mnReadBufferLength))
+        {
+            const unsigned char* pTmp = mpImpl->mpReadBuffer + mpImpl->mnReadBufferPos;
+            mpImpl->mnReadBufferPos += numBytes;
+            numBytesRead = numBytes;
+            return pTmp;
+        }
+
+        mpImpl->invalidateReadBuffer();
+    }
+
+    unsigned long curpos = static_cast<unsigned long>(mpImpl->tell());
+    if (curpos == static_cast<unsigned long>(-1)) // returned ERROR
+        return nullptr;
+
+    if ((curpos + numBytes < curpos) /*overflow*/
+        || (curpos + numBytes
+            >= o3tl::make_unsigned(mpImpl->mnLength))) /*reading more than available*/
+    {
+        numBytes = mpImpl->mnLength - curpos;
+    }
+
+    if (numBytes < BUFFER_MAX)
+    {
+        if (BUFFER_MAX < mpImpl->mnLength - curpos)
+            mpImpl->mnReadBufferLength = BUFFER_MAX;
+        else /* BUFFER_MAX >= mpImpl->mnLength - curpos */
+            mpImpl->mnReadBufferLength = mpImpl->mnLength - curpos;
+    }
+    else
+        mpImpl->mnReadBufferLength = numBytes;
+
+    unsigned long tmpNumBytes(0);
+    mpImpl->mpReadBuffer = mpImpl->read(mpImpl->mnReadBufferLength, tmpNumBytes);
+    if (tmpNumBytes != mpImpl->mnReadBufferLength)
+        mpImpl->mnReadBufferLength = tmpNumBytes;
+
+    mpImpl->mnReadBufferPos = 0;
+    if (!mpImpl->mnReadBufferLength)
+        return nullptr;
+
+    if (numBytes <= mpImpl->mnReadBufferLength)
+        numBytesRead = numBytes;
+    else
+        numBytesRead = mpImpl->mnReadBufferLength;
+
+    mpImpl->mnReadBufferPos += numBytesRead;
+    return mpImpl->mpReadBuffer;
+}
+
+long WPXSvInputStream::tell()
+{
+    tools::Long retVal = mpImpl->tell();
+    return retVal - static_cast<tools::Long>(mpImpl->mnReadBufferLength)
+           + static_cast<tools::Long>(mpImpl->mnReadBufferPos);
+}
+
+int WPXSvInputStream::seek(long offset, librevenge::RVNG_SEEK_TYPE seekType)
+{
+    sal_Int64 tmpOffset = offset;
+    if (seekType == librevenge::RVNG_SEEK_CUR)
+        tmpOffset += tell();
+    if (seekType == librevenge::RVNG_SEEK_END)
+        tmpOffset += mpImpl->mnLength;
+
+    int retVal = 0;
+    if (tmpOffset < 0)
+    {
+        tmpOffset = 0;
+        retVal = -1;
+    }
+    if (tmpOffset > mpImpl->mnLength)
+    {
+        tmpOffset = mpImpl->mnLength;
+        retVal = -1;
+    }
+
+    if (tmpOffset < mpImpl->tell()
+        && o3tl::make_unsigned(tmpOffset)
+               >= static_cast<unsigned long>(mpImpl->tell()) - mpImpl->mnReadBufferLength)
+    {
+        mpImpl->mnReadBufferPos = static_cast<unsigned long>(
+            tmpOffset + static_cast<tools::Long>(mpImpl->mnReadBufferLength) - mpImpl->tell());
+        return retVal;
+    }
+
+    mpImpl->invalidateReadBuffer();
+
+    if (mpImpl->seek(tmpOffset))
+        return -1;
+    return retVal;
+}
+
+bool WPXSvInputStream::isEnd()
+{
+    return mpImpl->isEnd() && mpImpl->mnReadBufferPos == mpImpl->mnReadBufferLength;
+}
+
+bool WPXSvInputStream::isStructured()
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->isStructured();
+}
+
+unsigned WPXSvInputStream::subStreamCount()
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->subStreamCount();
+}
+
+const char* WPXSvInputStream::subStreamName(const unsigned id)
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->subStreamName(id);
+}
+
+bool WPXSvInputStream::existsSubStream(const char* const name)
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->existsSubStream(name);
+}
+
+librevenge::RVNGInputStream* WPXSvInputStream::getSubStreamByName(const char* name)
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->getSubStreamByName(name);
+}
+
+librevenge::RVNGInputStream* WPXSvInputStream::getSubStreamById(const unsigned id)
+{
+    mpImpl->invalidateReadBuffer();
+    return mpImpl->getSubStreamById(id);
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */