Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-15 05:54:39 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-15 05:54:39 +0000
commit: 267c6f2ac71f92999e969232431ba04678e7437e (patch)
tree: 358c9467650e1d0a1d7227a21dac2e3d08b622b2 /sax
parent: Initial commit. (diff)
download: libreoffice-267c6f2ac71f92999e969232431ba04678e7437e.tar.xz
libreoffice-267c6f2ac71f92999e969232431ba04678e7437e.zip
45 files changed, 13363 insertions, 0 deletions
diff --git a/sax/CppunitTest_sax.mk b/sax/CppunitTest_sax.mk
new file mode 100644
index 0000000000..282ba2414e
--- /dev/null
+++ b/sax/CppunitTest_sax.mk
@@ -0,0 +1,30 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# 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/.
+#
+
+$(eval $(call gb_CppunitTest_CppunitTest,sax))
+
+$(eval $(call gb_CppunitTest_use_sdk_api,sax))
+
+$(eval $(call gb_CppunitTest_use_external,sax,boost_headers))
+
+$(eval $(call gb_CppunitTest_use_common_precompiled_header,sax))
+
+$(eval $(call gb_CppunitTest_use_libraries,sax, \
+	sax \
+	sal \
+	comphelper \
+	cppu \
+))
+
+$(eval $(call gb_CppunitTest_add_exception_objects,sax, \
+	sax/qa/cppunit/test_converter \
+))
+
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/CppunitTest_sax_attributes.mk b/sax/CppunitTest_sax_attributes.mk
new file mode 100644
index 0000000000..198629814f
--- /dev/null
+++ b/sax/CppunitTest_sax_attributes.mk
@@ -0,0 +1,29 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_CppunitTest_CppunitTest,sax_attributes))
+
+$(eval $(call gb_CppunitTest_use_common_precompiled_header,sax_attributes))
+
+$(eval $(call gb_CppunitTest_add_exception_objects,sax_attributes, \
+	sax/qa/cppunit/attributes \
+))
+
+$(eval $(call gb_CppunitTest_use_libraries,sax_attributes, \
+	cppu \
+	cppuhelper \
+	sal \
+	sax \
+))
+
+$(eval $(call gb_CppunitTest_use_sdk_api,sax_attributes))
+
+$(eval $(call gb_CppunitTest_use_ure,sax_attributes))
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/CppunitTest_sax_parser.mk b/sax/CppunitTest_sax_parser.mk
new file mode 100644
index 0000000000..27dfc15fed
--- /dev/null
+++ b/sax/CppunitTest_sax_parser.mk
@@ -0,0 +1,48 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_CppunitTest_CppunitTest,sax_parser))
+
+$(eval $(call gb_CppunitTest_use_common_precompiled_header,sax_parser))
+
+$(eval $(call gb_CppunitTest_add_exception_objects,sax_parser, \
+	sax/qa/cppunit/parser \
+))
+
+$(eval $(call gb_CppunitTest_use_libraries,sax_parser, \
+	comphelper \
+	cppu \
+	cppuhelper \
+	unotest \
+	sal \
+	sax \
+	test \
+))
+
+$(eval $(call gb_CppunitTest_use_externals,sax_parser, \
+	boost_headers \
+))
+
+$(eval $(call gb_CppunitTest_use_sdk_api,sax_parser))
+
+$(eval $(call gb_CppunitTest_use_ure,sax_parser))
+$(eval $(call gb_CppunitTest_use_vcl,sax_parser))
+
+$(eval $(call gb_CppunitTest_use_components,sax_parser,\
+	configmgr/source/configmgr \
+	framework/util/fwk \
+	i18npool/util/i18npool \
+	sfx2/util/sfx \
+	ucb/source/core/ucb1 \
+	ucb/source/ucp/file/ucpfile1 \
+))
+
+$(eval $(call gb_CppunitTest_use_configuration,sax_parser))
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/CppunitTest_sax_xmlimport.mk b/sax/CppunitTest_sax_xmlimport.mk
new file mode 100644
index 0000000000..2e10736329
--- /dev/null
+++ b/sax/CppunitTest_sax_xmlimport.mk
@@ -0,0 +1,57 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_CppunitTest_CppunitTest,sax_xmlimport))
+
+$(eval $(call gb_CppunitTest_use_common_precompiled_header,sax_xmlimport))
+
+$(eval $(call gb_CppunitTest_add_exception_objects,sax_xmlimport, \
+sax/qa/cppunit/xmlimport \
+))
+
+$(eval $(call gb_CppunitTest_use_libraries,sax_xmlimport, \
+    test \
+    cppu \
+    comphelper \
+    sal \
+    cppuhelper \
+    sax \
+    unotest \
+    utl \
+    salhelper \
+))
+
+$(eval $(call gb_CppunitTest_use_api,sax_xmlimport,\
+    offapi \
+    udkapi \
+))
+
+$(eval $(call gb_CppunitTest_use_externals,sax_xmlimport, \
+	boost_headers \
+))
+
+$(eval $(call gb_CppunitTest_use_ure,sax_xmlimport))
+$(eval $(call gb_CppunitTest_use_vcl,sax_xmlimport))
+
+$(eval $(call gb_CppunitTest_set_include,sax_xmlimport,\
+    -I$(SRCDIR)/sax/inc \
+    $$(INCLUDE) \
+))
+
+$(eval $(call gb_CppunitTest_use_components,sax_xmlimport,\
+    configmgr/source/configmgr \
+    sax/source/expatwrap/expwrap \
+    ucb/source/core/ucb1 \
+    ucb/source/ucp/file/ucpfile1 \
+    uui/util/uui \
+))
+
+$(eval $(call gb_CppunitTest_use_configuration,sax_xmlimport))
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/IwyuFilter_sax.yaml b/sax/IwyuFilter_sax.yaml
new file mode 100644
index 0000000000..986dcdc988
--- /dev/null
+++ b/sax/IwyuFilter_sax.yaml
@@ -0,0 +1,2 @@
+---
+assumeFilename: sax/source/fastparser/fastparser.cxx
diff --git a/sax/Library_sax.mk b/sax/Library_sax.mk
new file mode 100644
index 0000000000..97389a2bb0
--- /dev/null
+++ b/sax/Library_sax.mk
@@ -0,0 +1,56 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Library_Library,sax))
+
+$(eval $(call gb_Library_set_componentfile,sax,sax/source/expatwrap/expwrap,services))
+
+$(eval $(call gb_Library_set_include,sax,\
+	-I$(SRCDIR)/sax/inc \
+	$$(INCLUDE) \
+))
+
+$(eval $(call gb_Library_use_external,sax,boost_headers))
+
+$(eval $(call gb_Library_use_common_precompiled_header,sax))
+
+$(eval $(call gb_Library_use_sdk_api,sax))
+
+$(eval $(call gb_Library_use_externals,sax,\
+	boost_headers \
+	libxml2 \
+	expat \
+))
+
+$(eval $(call gb_Library_use_libraries,sax,\
+	comphelper \
+	cppu \
+	cppuhelper \
+	sal \
+	salhelper \
+	tl \
+))
+
+$(eval $(call gb_Library_add_defs,sax,\
+	-DSAX_DLLIMPLEMENTATION \
+))
+
+$(eval $(call gb_Library_add_exception_objects,sax,\
+	sax/source/expatwrap/sax_expat \
+	sax/source/expatwrap/saxwriter \
+	sax/source/expatwrap/xml2utf \
+	sax/source/fastparser/fastparser \
+	sax/source/fastparser/legacyfastparser \
+	sax/source/tools/converter \
+	sax/source/tools/fastattribs \
+	sax/source/tools/fastserializer \
+	sax/source/tools/fshelper \
+))
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/Makefile b/sax/Makefile
new file mode 100644
index 0000000000..ccb1c85a04
--- /dev/null
+++ b/sax/Makefile
@@ -0,0 +1,7 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+
+module_directory:=$(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+
+include $(module_directory)/../solenv/gbuild/partial_build.mk
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/Module_sax.mk b/sax/Module_sax.mk
new file mode 100644
index 0000000000..2c0b9596a8
--- /dev/null
+++ b/sax/Module_sax.mk
@@ -0,0 +1,23 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Module_Module,sax))
+
+$(eval $(call gb_Module_add_targets,sax,\
+	Library_sax \
+))
+
+$(eval $(call gb_Module_add_check_targets,sax,\
+	CppunitTest_sax \
+	CppunitTest_sax_attributes \
+	CppunitTest_sax_parser \
+	CppunitTest_sax_xmlimport \
+))
+
+# vim: set noet sw=4 ts=4:
diff --git a/sax/README.md b/sax/README.md
new file mode 100644
index 0000000000..30ae23197a
--- /dev/null
+++ b/sax/README.md
@@ -0,0 +1,15 @@
+# UNO Services for SAX
+ 
+UNO services for SAX parsing and C++ functions for XMLSchema-2 data types.
+
+* `source/expwrap`:
+    string-based SAX parser UNO service wrapping expat
+* `source/fastparser`:
+    multi-threaded token-based SAX parser UNO service wrapping libxml2
+* `source/tools`:
+    + C++ wrapper for fast SAX parser
+    + C++ XMLSchema-2 data type conversion helpers
+
+Multi-threading in FastParser can be disabled for debugging purposes with:
+
+    SAX_DISABLE_THREADS=1 SAL_LOG="+INFO.sax.fastparser+WARN"
diff --git a/sax/README.vars b/sax/README.vars
new file mode 100644
index 0000000000..35d0bccd03
--- /dev/null
+++ b/sax/README.vars
@@ -0,0 +1,5 @@
+Environment variables in sax:
+
+- fastparser:
+
+  - SAX_DISABLE_THREADS - don't thread sax parsing
diff --git a/sax/inc/xml2utf.hxx b/sax/inc/xml2utf.hxx
new file mode 100644
index 0000000000..ead6ac1143
--- /dev/null
+++ b/sax/inc/xml2utf.hxx
@@ -0,0 +1,129 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_SAX_INC_XML2UTF_HXX
+#define INCLUDED_SAX_INC_XML2UTF_HXX
+
+#include <sal/config.h>
+
+#include <memory>
+
+#include <sal/types.h>
+#include <rtl/string.hxx>
+
+#include <com/sun/star/io/XInputStream.hpp>
+
+namespace sax_expatwrap {
+
+class Text2UnicodeConverter
+{
+
+public:
+    Text2UnicodeConverter( const OString & sEncoding );
+    ~Text2UnicodeConverter();
+
+    css::uno::Sequence < sal_Unicode > convert( const css::uno::Sequence<sal_Int8> & );
+    bool canContinue() const { return m_bCanContinue; }
+
+private:
+    void init( rtl_TextEncoding encoding );
+
+    rtl_TextToUnicodeConverter   m_convText2Unicode;
+    rtl_TextToUnicodeContext     m_contextText2Unicode;
+    bool                         m_bCanContinue;
+    bool                         m_bInitialized;
+    css::uno::Sequence<sal_Int8> m_seqSource;
+};
+
+/*----------------------------------------
+*
+* Unicode2TextConverter
+*
+**-----------------------------------------*/
+class Unicode2TextConverter
+{
+public:
+    Unicode2TextConverter( rtl_TextEncoding encoding );
+    ~Unicode2TextConverter();
+
+    css::uno::Sequence<sal_Int8> convert( const sal_Unicode * , sal_Int32 nLength );
+
+private:
+    rtl_UnicodeToTextConverter      m_convUnicode2Text;
+    rtl_UnicodeToTextContext        m_contextUnicode2Text;
+    css::uno::Sequence<sal_Unicode> m_seqSource;
+};
+
+
+/*----------------------------------------
+*
+* XMLFile2UTFConverter
+*
+**-----------------------------------------*/
+class XMLFile2UTFConverter
+{
+public:
+    XMLFile2UTFConverter( ):
+        m_bStarted( false )
+        {}
+
+    void setInputStream( css::uno::Reference< css::io::XInputStream > const &r ) { m_in = r; }
+    void setEncoding( const OString &s ) { m_sEncoding = s; }
+
+
+    // @param nMaxToRead The number of chars, that should be read. Note that this is no exact number. There
+    //                   may be returned less or more bytes than ordered.
+    /// @throws css::io::IOException
+    /// @throws css::io::NotConnectedException
+    /// @throws css::io::BufferSizeExceededException
+    /// @throws css::uno::RuntimeException
+    sal_Int32 readAndConvert( css::uno::Sequence<sal_Int8> &seq , sal_Int32 nMaxToRead );
+
+private:
+
+    // Called only on first Sequence of bytes. Tries to figure out file format and encoding information.
+    // @return TRUE, when encoding information could be retrieved
+    // @return FALSE, when no encoding information was found in file
+    bool scanForEncoding( css::uno::Sequence<sal_Int8> &seq );
+
+    // Called only on first Sequence of bytes. Tries to figure out
+    // if enough data is available to scan encoding
+    // @return TRUE, when encoding is retrievable
+    // @return FALSE, when more data is needed
+    static bool isEncodingRecognizable( const css::uno::Sequence< sal_Int8 > & seq );
+
+    // When encoding attribute is within the text (in the first line), it is removed.
+    static void removeEncoding( css::uno::Sequence<sal_Int8> &seq );
+
+    // Initializes decoding depending on m_sEncoding setting
+    void initializeDecoding();
+private:
+    css::uno::Reference< css::io::XInputStream >  m_in;
+
+    bool m_bStarted;
+    OString m_sEncoding;
+
+    std::unique_ptr<Text2UnicodeConverter> m_pText2Unicode;
+    std::unique_ptr<Unicode2TextConverter> m_pUnicode2Text;
+};
+}
+
+#endif // INCLUDED_SAX_INC_XML2UTF_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/qa/cppunit/attributes.cxx b/sax/qa/cppunit/attributes.cxx
new file mode 100644
index 0000000000..899716d62f
--- /dev/null
+++ b/sax/qa/cppunit/attributes.cxx
@@ -0,0 +1,79 @@
+/* -*- 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 <sal/types.h>
+#include <com/sun/star/xml/sax/SAXException.hpp>
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/plugin/TestPlugIn.h>
+
+#include <rtl/ref.hxx>
+#include <sax/fastattribs.hxx>
+
+using namespace css;
+using namespace css::xml;
+
+namespace {
+
+class AttributesTest: public CppUnit::TestFixture
+{
+public:
+    void test();
+
+    CPPUNIT_TEST_SUITE( AttributesTest );
+    CPPUNIT_TEST( test );
+    CPPUNIT_TEST_SUITE_END();
+};
+
+void AttributesTest::test()
+{
+    rtl::Reference<sax_fastparser::FastAttributeList> xAttributeList( new sax_fastparser::FastAttributeList(nullptr) );
+    xAttributeList->add(1, "1");
+    xAttributeList->add(2, OString::Concat("2"));
+    xAttributeList->add(3, u"3");
+    xAttributeList->add(4, OUString::Concat("4"));
+
+    // We can't test getValueToken() and getOptionalValueToken()
+    // without XFastTokenHandler :-(
+    // Uncomment to get segmentation fault:
+    // xAttributeList->getOptionalValueToken(1, 0);
+    // xAttributeList->getValueToken(2);
+
+    CPPUNIT_ASSERT( xAttributeList->hasAttribute(1) );
+    CPPUNIT_ASSERT( !xAttributeList->hasAttribute(5) );
+
+    CPPUNIT_ASSERT_EQUAL( OUString("2"), xAttributeList->getOptionalValue(2)  );
+    CPPUNIT_ASSERT_EQUAL( OUString("3"), xAttributeList->getOptionalValue(3) );
+    CPPUNIT_ASSERT_EQUAL( OUString("4"), xAttributeList->getOptionalValue(4) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), xAttributeList->getOptionalValue(5) );
+
+    CPPUNIT_ASSERT_EQUAL( OUString("1"), xAttributeList->getValue(1) );
+    CPPUNIT_ASSERT_THROW( xAttributeList->getValue(5), xml::sax::SAXException );
+
+    xAttributeList->addUnknown("a"_ostr, "a"_ostr);
+    xAttributeList->addUnknown("b", "b"_ostr, "b"_ostr);
+    xAttributeList->addUnknown("c"_ostr, "c"_ostr);
+    CPPUNIT_ASSERT_EQUAL( sal_Int32(3), xAttributeList->getUnknownAttributes().getLength() );
+
+    CPPUNIT_ASSERT_EQUAL( sal_Int32(4), xAttributeList->getFastAttributes().getLength() );
+
+    xAttributeList->clear();
+    CPPUNIT_ASSERT( !xAttributeList->hasAttribute(1) );
+    CPPUNIT_ASSERT( !xAttributeList->getFastAttributes().hasElements() );
+    xAttributeList->addUnknown("c"_ostr, "c"_ostr);
+    CPPUNIT_ASSERT_EQUAL( sal_Int32(1), xAttributeList->getUnknownAttributes().getLength() );
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION( AttributesTest );
+
+}
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/qa/cppunit/parser.cxx b/sax/qa/cppunit/parser.cxx
new file mode 100644
index 0000000000..670c1afa92
--- /dev/null
+++ b/sax/qa/cppunit/parser.cxx
@@ -0,0 +1,99 @@
+/* -*- 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 <sal/config.h>
+
+#include <com/sun/star/io/Pipe.hpp>
+#include <com/sun/star/xml/sax/FastToken.hpp>
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+
+#include <sax/fastparser.hxx>
+#include <sax/fastattribs.hxx>
+#include <test/bootstrapfixture.hxx>
+#include <rtl/ref.hxx>
+
+using namespace css;
+using namespace css::xml::sax;
+
+namespace {
+
+class DummyTokenHandler : public sax_fastparser::FastTokenHandlerBase
+{
+public:
+             DummyTokenHandler() {}
+
+    virtual sal_Int32 SAL_CALL getTokenFromUTF8( const uno::Sequence<sal_Int8>& ) override
+    {
+        return FastToken::DONTKNOW;
+    }
+    virtual uno::Sequence< sal_Int8 > SAL_CALL getUTF8Identifier( sal_Int32 ) override
+    {
+        CPPUNIT_ASSERT_MESSAGE( "getUTF8Identifier: unexpected call", false );
+        return uno::Sequence<sal_Int8>();
+    }
+    virtual sal_Int32 getTokenDirect( const char * /* pToken */, sal_Int32 /* nLength */ ) const override
+    {
+        return -1;
+    }
+};
+
+class ParserTest: public test::BootstrapFixture
+{
+    InputSource maInput;
+    rtl::Reference< sax_fastparser::FastSaxParser > mxParser;
+    rtl::Reference< DummyTokenHandler > mxTokenHandler;
+
+public:
+    virtual void setUp() override;
+
+    void parse();
+
+    CPPUNIT_TEST_SUITE(ParserTest);
+    CPPUNIT_TEST(parse);
+    CPPUNIT_TEST_SUITE_END();
+
+private:
+    uno::Reference< io::XInputStream > createStream(const OString& sInput);
+};
+
+void ParserTest::setUp()
+{
+    test::BootstrapFixture::setUp();
+    mxTokenHandler.set( new DummyTokenHandler() );
+    mxParser.set( new sax_fastparser::FastSaxParser() );
+    mxParser->setTokenHandler( mxTokenHandler );
+}
+
+uno::Reference< io::XInputStream > ParserTest::createStream(const OString& sInput)
+{
+    uno::Reference< io::XOutputStream > xPipe( io::Pipe::create(m_xContext) );
+    uno::Reference< io::XInputStream > xInStream( xPipe, uno::UNO_QUERY );
+    uno::Sequence< sal_Int8 > aSeq( reinterpret_cast<sal_Int8 const *>(sInput.getStr()), sInput.getLength() );
+    xPipe->writeBytes( aSeq );
+    xPipe->flush();
+    xPipe->closeOutput();
+    return xInStream;
+}
+
+void ParserTest::parse()
+{
+    maInput.aInputStream = createStream("<a>...<b />..</a>"_ostr);
+    mxParser->parseStream( maInput );
+
+    maInput.aInputStream = createStream("<b></a>"_ostr);
+    CPPUNIT_ASSERT_THROW( mxParser->parseStream( maInput ), css::xml::sax::SAXParseException );
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION(ParserTest);
+
+}
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/qa/cppunit/test_converter.cxx b/sax/qa/cppunit/test_converter.cxx
new file mode 100644
index 0000000000..525e110c1a
--- /dev/null
+++ b/sax/qa/cppunit/test_converter.cxx
@@ -0,0 +1,623 @@
+/* -*- 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 <limits>
+
+#include <sal/types.h>
+#include <cppunit/TestAssert.h>
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/plugin/TestPlugIn.h>
+
+#include <rtl/ustrbuf.hxx>
+
+#include <com/sun/star/util/DateTime.hpp>
+#include <com/sun/star/util/Duration.hpp>
+#include <com/sun/star/util/MeasureUnit.hpp>
+
+#include <sax/tools/converter.hxx>
+#include <sal/log.hxx>
+
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::util;
+using sax::Converter;
+
+
+namespace {
+
+class ConverterTest
+    : public ::CppUnit::TestFixture
+{
+public:
+
+    void testDuration();
+    void testDateTime();
+    void testTime();
+    void testDouble();
+    void testMeasure();
+    void testBool();
+    void testPercent();
+    void testColor();
+    void testNumber();
+
+    CPPUNIT_TEST_SUITE(ConverterTest);
+    CPPUNIT_TEST(testDuration);
+    CPPUNIT_TEST(testDateTime);
+    CPPUNIT_TEST(testTime);
+    CPPUNIT_TEST(testDouble);
+    CPPUNIT_TEST(testMeasure);
+    CPPUNIT_TEST(testBool);
+    CPPUNIT_TEST(testPercent);
+    CPPUNIT_TEST(testColor);
+    CPPUNIT_TEST(testNumber);
+    CPPUNIT_TEST_SUITE_END();
+
+private:
+};
+
+void doTest(util::Duration const & rid, char const*const pis,
+        char const*const i_pos = nullptr)
+{
+    char const*const pos(i_pos ? i_pos : pis);
+    util::Duration od;
+    OUString is(OUString::createFromAscii(pis));
+    SAL_INFO("sax.cppunit","about to convert '" << is << "'");
+    bool bSuccess = Converter::convertDuration(od, is);
+    SAL_INFO("sax.cppunit","" << (od.Negative ? "-" : "+")  << " " << od.Years << "Y " << od.Months << "M " << od.Days << "D " << od.Hours << "H " << od.Minutes << "M " << od.Seconds << "S " << od.NanoSeconds << "n");
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(rid.Years, od.Years);
+    CPPUNIT_ASSERT_EQUAL(rid.Months, od.Months);
+    CPPUNIT_ASSERT_EQUAL(rid.Days, od.Days);
+    CPPUNIT_ASSERT_EQUAL(rid.Hours, od.Hours);
+    CPPUNIT_ASSERT_EQUAL(rid.Minutes, od.Minutes);
+    CPPUNIT_ASSERT_EQUAL(rid.Seconds, od.Seconds);
+    CPPUNIT_ASSERT_EQUAL(rid.NanoSeconds, od.NanoSeconds);
+    CPPUNIT_ASSERT_EQUAL(rid.Negative, od.Negative);
+    OUStringBuffer buf(64);
+    Converter::convertDuration(buf, od);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT(buf.makeStringAndClear().equalsAscii(pos));
+}
+
+void doTestDurationF(char const*const pis)
+{
+    util::Duration od;
+    bool bSuccess = Converter::convertDuration(od,
+            OUString::createFromAscii(pis));
+    SAL_INFO("sax.cppunit","" << (od.Negative ? "-" : "+") << " " << od.Years << "Y " << od.Months << "M " << od.Days << "D " << od.Hours << "H " << od.Minutes << "M " << od.Seconds << "S " << od.NanoSeconds << "n");
+    CPPUNIT_ASSERT_MESSAGE(pis, !bSuccess);
+}
+
+void ConverterTest::testDuration()
+{
+    SAL_INFO("sax.cppunit","\nSAX CONVERTER TEST BEGIN");
+    doTest( util::Duration(false, 1, 0, 0, 0, 0, 0, 0), "P1Y" );
+    doTest( util::Duration(false, 0, 42, 0, 0, 0, 0, 0), "P42M" );
+    doTest( util::Duration(false, 0, 0, 111, 0, 0, 0, 0), "P111D" );
+    doTest( util::Duration(false, 0, 0, 0, 52, 0, 0, 0), "PT52H" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 717, 0, 0), "PT717M" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 121, 0), "PT121S" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 0, 190000000), "PT0.19S",        "PT0.190000000S");
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 0,  90000000), "PT0.09S",        "PT0.090000000S" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 0,   9000000), "PT0.009S",       "PT0.009000000S" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 0,         9), "PT0.000000009S", "PT0.000000009S" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 9, 999999999),
+            "PT9.999999999999999999999999999999S", "PT9.999999999S" );
+    doTest( util::Duration(true , 0, 0, 9999, 0, 0, 0, 0), "-P9999D" );
+    doTest( util::Duration(true , 7, 6, 5, 4, 3, 2,  10000000),
+            "-P7Y6M5DT4H3M2.01000S", "-P7Y6M5DT4H3M2.010000000S" );
+    doTest( util::Duration(false, 0, 6, 0, 0, 3, 0, 0), "P6MT3M" );
+    doTest( util::Duration(false, 0, 0, 0, 0, 0, 0, 0), "P0D" );
+    doTestDurationF("1Y1M");        // invalid: no ^P
+    doTestDurationF("P-1Y1M");      // invalid: - after P
+    doTestDurationF("P1M1Y");       // invalid: Y after M
+    doTestDurationF("PT1Y");        // invalid: Y after T
+    doTestDurationF("P1Y1M1M");     // invalid: M twice, no T
+    doTestDurationF("P1YT1MT1M");   // invalid: T twice
+    doTestDurationF("P1YT");        // invalid: T but no H,M,S
+    doTestDurationF("P99999999999Y");   // cannot parse so many Ys
+    doTestDurationF("PT.1S");       // invalid: no 0 preceding .
+    doTestDurationF("PT5M.134S");   // invalid: no 0 preceding .
+    doTestDurationF("PT1.S");       // invalid: no digit following .
+    SAL_INFO("sax.cppunit","\nSAX CONVERTER TEST END");
+}
+
+
+bool eqDateTime(const util::DateTime& a, const util::DateTime& b) {
+    return a.Year == b.Year && a.Month == b.Month && a.Day == b.Day
+        && a.Hours == b.Hours && a.Minutes == b.Minutes
+        && a.Seconds == b.Seconds
+        && a.NanoSeconds == b.NanoSeconds
+        && a.IsUTC == b.IsUTC;
+}
+
+void doTest(util::DateTime const & rdt, char const*const pis,
+        char const*const i_pos = nullptr)
+{
+    char const*const pos(i_pos ? i_pos : pis);
+    OUString is(OUString::createFromAscii(pis));
+    util::DateTime odt;
+    SAL_INFO("sax.cppunit","about to convert '" << is << "'");
+    bool bSuccess( Converter::parseDateTime(odt, is) );
+    SAL_INFO("sax.cppunit","Y:" << odt.Year << " M:" << odt.Month << " D:" << odt.Day << "  H:" << odt.Hours << " M:" << odt.Minutes << " S:" << odt.Seconds << " nS:" << odt.NanoSeconds << " UTC: " << static_cast<bool>(odt.IsUTC));
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT(eqDateTime(rdt, odt));
+    OUStringBuffer buf(32);
+    Converter::convertDateTime(buf, odt, nullptr, true);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(OUString::createFromAscii(pos),
+                         buf.makeStringAndClear());
+}
+
+void doTestDateTimeF(char const*const pis)
+{
+    util::DateTime odt;
+    bool bSuccess = Converter::parseDateTime(odt, OUString::createFromAscii(pis));
+    SAL_INFO("sax.cppunit","Y:" << odt.Year << " M:" << odt.Month << " D:" << odt.Day << "  H:" << odt.Hours << "H M:" << odt.Minutes << " S:" << odt.Seconds << " nS:" << odt.NanoSeconds);
+    CPPUNIT_ASSERT(!bSuccess);
+}
+
+void ConverterTest::testDateTime()
+{
+    SAL_INFO("sax.cppunit","\nSAX CONVERTER TEST BEGIN");
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, 1, false), "0001-01-01T00:00:00" );
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, 1, true), "0001-01-01T00:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, -1, false),
+            "-0001-01-01T00:00:00");
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, -1, true),
+            "-0001-01-01T01:00:00+01:00", "-0001-01-01T00:00:00Z");
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, -324, false),
+            "-0324-01-01T00:00:00" );
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, 1, true),
+            "0001-01-01T00:00:00-00:00", "0001-01-01T00:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, 1, true),
+            "0001-01-01T00:00:00+00:00", "0001-01-01T00:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 12, 2, 1, 1, true),
+            "0001-01-02T00:00:00-12:00", "0001-01-02T12:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 12, 1, 1, 1, true),
+            "0001-01-02T00:00:00+12:00", "0001-01-01T12:00:00Z"  );
+    doTest( util::DateTime(990000000, 59, 59, 23, 31, 12, 9999, false),
+            "9999-12-31T23:59:59.99",  "9999-12-31T23:59:59.990000000" );
+    doTest( util::DateTime(990000000, 59, 59, 23, 31, 12, 9999, true),
+            "9999-12-31T23:59:59.99Z", "9999-12-31T23:59:59.990000000Z" );
+    doTest( util::DateTime(999999999, 59, 59, 23, 31, 12, 9999, false),
+            "9999-12-31T23:59:59.9999999999999999999999999999999999999",
+            "9999-12-31T23:59:59.999999999" );
+    doTest( util::DateTime(999999999, 59, 59, 23, 31, 12, 9999, true),
+            "9999-12-31T23:59:59.9999999999999999999999999999999999999Z",
+            "9999-12-31T23:59:59.999999999Z" );
+    doTest( util::DateTime(0, 0, 0, 0, 29, 2, 2000, true), // leap year
+            "2000-02-29T00:00:00-00:00", "2000-02-29T00:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 0, 29, 2, 1600, true), // leap year
+            "1600-02-29T00:00:00-00:00", "1600-02-29T00:00:00Z" );
+    doTest( util::DateTime(0, 0, 0, 24, 1, 1, 333, false)
+                /*(0, 0, 0, 0, 2, 1, 333)*/,
+            "0333-01-01T24:00:00"/*, "0333-01-02T00:00:00"*/ );
+    // While W3C XMLSchema specifies a minimum of 4 year digits we are lenient
+    // in what we accept.
+    doTest( util::DateTime(0, 0, 0, 0, 1, 1, 1, false),
+            "1-01-01T00:00:00", "0001-01-01T00:00:00" );
+    doTestDateTimeF( "+0001-01-01T00:00:00" ); // invalid: ^+
+    doTestDateTimeF( "0001-1-01T00:00:00" ); // invalid: < 2 M
+    doTestDateTimeF( "0001-01-1T00:00:00" ); // invalid: < 2 D
+    doTestDateTimeF( "0001-01-01T0:00:00" ); // invalid: < 2 H
+    doTestDateTimeF( "0001-01-01T00:0:00" ); // invalid: < 2 M
+    doTestDateTimeF( "0001-01-01T00:00:0" ); // invalid: < 2 S
+    doTestDateTimeF( "0001-01-01T00:00:00." ); // invalid: .$
+    doTestDateTimeF( "0001-01-01T00:00:00+1:00" ); // invalid: < 2 TZ H
+    doTestDateTimeF( "0001-01-01T00:00:00+00:1" ); // invalid: < 2 TZ M
+    doTestDateTimeF( "0001-13-01T00:00:00" ); // invalid: M > 12
+    doTestDateTimeF( "0001-01-32T00:00:00" ); // invalid: D > 31
+    doTestDateTimeF( "0001-01-01T25:00:00" ); // invalid: H > 24
+    doTestDateTimeF( "0001-01-01T00:60:00" ); // invalid: M > 59
+    doTestDateTimeF( "0001-01-01T00:00:60" ); // invalid: S > 59
+    doTestDateTimeF( "0001-01-01T24:01:00" ); // invalid: H=24, but M != 0
+    doTestDateTimeF( "0001-01-01T24:00:01" ); // invalid: H=24, but S != 0
+    doTestDateTimeF( "0001-01-01T24:00:00.1" ); // invalid: H=24, but H != 0
+    doTestDateTimeF( "0001-01-02T00:00:00+15:00" ); // invalid: TZ > +14:00
+    doTestDateTimeF( "0001-01-02T00:00:00+14:01" ); // invalid: TZ > +14:00
+    doTestDateTimeF( "0001-01-02T00:00:00-15:00" ); // invalid: TZ < -14:00
+    doTestDateTimeF( "0001-01-02T00:00:00-14:01" ); // invalid: TZ < -14:00
+    doTestDateTimeF( "2100-02-29T00:00:00-00:00" ); // invalid: no leap year
+    doTestDateTimeF( "1900-02-29T00:00:00-00:00" ); // invalid: no leap year
+    doTestDateTimeF( "00:00:00" ); // invalid: no date
+    doTestDateTimeF( "T00:00:00" ); // invalid: no date
+    SAL_INFO("sax.cppunit","\nSAX CONVERTER TEST END");
+}
+
+void doTestTime(util::DateTime const & rdt, char const*const pis,
+        char const*const i_pos = nullptr)
+{
+    char const*const pos(i_pos ? i_pos : pis);
+    OUString is(OUString::createFromAscii(pis));
+    util::DateTime odt;
+    SAL_INFO("sax.cppunit","about to convert '" << is << "'");
+    bool bSuccess( Converter::parseTimeOrDateTime(odt, is) );
+    SAL_INFO("sax.cppunit","Y:" << odt.Year << " M:" << odt.Month << " D:" << odt.Day << "  H:" << odt.Hours << " M:" << odt.Minutes << " S:" << odt.Seconds << " nS:" << odt.NanoSeconds << " UTC: " << static_cast<bool>(odt.IsUTC));
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT(eqDateTime(rdt, odt));
+    OUStringBuffer buf(32);
+    Converter::convertTimeOrDateTime(buf, odt);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(OUString::createFromAscii(pos),
+                         buf.makeStringAndClear());
+}
+
+void doTestTimeF(char const*const pis)
+{
+    util::DateTime odt;
+    bool bSuccess = Converter::parseTimeOrDateTime(odt, OUString::createFromAscii(pis));
+    SAL_INFO("sax.cppunit","Y:" << odt.Year << " M:" << odt.Month << " D:" << odt.Day << "  H:" << odt.Hours << "H M:" << odt.Minutes << " S:" << odt.Seconds << " nS:" << odt.NanoSeconds);
+    CPPUNIT_ASSERT_MESSAGE(pis, !bSuccess);
+}
+
+void ConverterTest::testTime() // time or dateTime + horrible backcompat mess
+{
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, false),
+            "0001-01-01T00:00:00" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, false),
+            "0001-01-01T00:00:00" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, true),
+            "0001-01-01T00:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, -1, false),
+            "-0001-01-01T00:00:00");
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, -1, true),
+            "-0001-01-01T01:00:00+01:00", "-0001-01-01T00:00:00Z");
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, -324, false),
+            "-0324-01-01T00:00:00" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, true),
+            "0001-01-01T00:00:00-00:00", "0001-01-01T00:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, true),
+            "0001-01-01T00:00:00+00:00", "0001-01-01T00:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 12, 2, 1, 1, true),
+            "0001-01-02T00:00:00-12:00", "0001-01-02T12:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 12, 1, 1, 1, true),
+            "0001-01-02T00:00:00+12:00", "0001-01-01T12:00:00Z"  );
+    doTestTime( util::DateTime(990000000, 59, 59, 23, 31, 12, 9999, false),
+            "9999-12-31T23:59:59.99",  "9999-12-31T23:59:59.990000000" );
+    doTestTime( util::DateTime(990000000, 59, 59, 23, 31, 12, 9999, true),
+            "9999-12-31T23:59:59.99Z", "9999-12-31T23:59:59.990000000Z" );
+    doTestTime( util::DateTime(999999999, 59, 59, 23, 31, 12, 9999, false),
+            "9999-12-31T23:59:59.9999999999999999999999999999999999999",
+            "9999-12-31T23:59:59.999999999" );
+    doTestTime( util::DateTime(999999999, 59, 59, 23, 31, 12, 9999, true),
+            "9999-12-31T23:59:59.9999999999999999999999999999999999999Z",
+            "9999-12-31T23:59:59.999999999Z" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 29, 2, 2000, true), // leap year
+            "2000-02-29T00:00:00-00:00", "2000-02-29T00:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 0, 29, 2, 1600, true), // leap year
+            "1600-02-29T00:00:00-00:00", "1600-02-29T00:00:00Z" );
+    doTestTime( util::DateTime(0, 0, 0, 24, 1, 1, 333, false)
+                /*(0, 0, 0, 0, 2, 1, 333)*/,
+            "0333-01-01T24:00:00"/*, "0333-01-02T00:00:00"*/ );
+    // While W3C XMLSchema specifies a minimum of 4 year digits we are lenient
+    // in what we accept.
+    doTestTime( util::DateTime(0, 0, 0, 0, 1, 1, 1, false),
+            "1-01-01T00:00:00", "0001-01-01T00:00:00" );
+
+    doTestTime( util::DateTime(0, 0, 0, 0, 0, 0, 0, false), "00:00:00" );
+    doTestTime( util::DateTime(0, 0, 0, 24, 0, 0, 0, false), "24:00:00" );
+    doTestTime( util::DateTime(0, 0, 59, 0, 0, 0, 0, false), "00:59:00" );
+    doTestTime( util::DateTime(0, 1, 2, 4, 0, 0, 0, true), "04:02:01Z" );
+    doTestTime( util::DateTime(0, 1, 2, 4, 0, 0, 0, true),
+            "05:02:01+01:00", "04:02:01Z" );
+    doTestTime( util::DateTime(0, 11, 12, 9, 0, 0, 0, true),
+            "05:12:11-04:00", "09:12:11Z" );
+    doTestTime( util::DateTime(990000000, 59, 59, 23, 0, 0, 0, false),
+            "23:59:59.99",  "23:59:59.990000000" );
+    doTestTime( util::DateTime(990000000, 59, 59, 23, 0, 0, 0, true),
+            "23:59:59.99Z",  "23:59:59.990000000Z" );
+    // backwards compatible: recognize invalid 0000-00-00 date (LO 3.5)
+    doTestTime( util::DateTime(0, 1, 0, 0, 0, 0, 0, false),
+            "0000-00-00T00:00:01", "00:00:01" );
+    // backwards compatible: recognize invalid 0-00-00 date (OOo)
+    doTestTime( util::DateTime(0, 0, 1, 0, 0, 0, 0, false),
+            "0-00-00T00:01:00", "00:01:00" );
+
+    doTestTimeF( "+0001-01-01T00:00:00" ); // invalid: ^+
+    doTestTimeF( "0001-1-01T00:00:00" ); // invalid: < 2 M
+    doTestTimeF( "0001-01-1T00:00:00" ); // invalid: < 2 D
+    doTestTimeF( "0001-01-01T0:00:00" ); // invalid: < 2 H
+    doTestTimeF( "0001-01-01T00:0:00" ); // invalid: < 2 M
+    doTestTimeF( "0001-01-01T00:00:0" ); // invalid: < 2 S
+    doTestTimeF( "0001-01-01T00:00:00." ); // invalid: .$
+    doTestTimeF( "0001-01-01T00:00:00+1:00" ); // invalid: < 2 TZ H
+    doTestTimeF( "0001-01-01T00:00:00+00:1" ); // invalid: < 2 TZ M
+    doTestTimeF( "0001-13-01T00:00:00" ); // invalid: M > 12
+    doTestTimeF( "0001-01-32T00:00:00" ); // invalid: D > 31
+    doTestTimeF( "0001-01-01T25:00:00" ); // invalid: H > 24
+    doTestTimeF( "0001-01-01T00:60:00" ); // invalid: M > 59
+    doTestTimeF( "0001-01-01T00:00:60" ); // invalid: S > 59
+    doTestTimeF( "0001-01-01T24:01:00" ); // invalid: H=24, but M != 0
+    doTestTimeF( "0001-01-01T24:00:01" ); // invalid: H=24, but S != 0
+    doTestTimeF( "0001-01-01T24:00:00.1" ); // invalid: H=24, but H != 0
+    doTestTimeF( "0001-01-02T00:00:00+15:00" ); // invalid: TZ > +14:00
+    doTestTimeF( "0001-01-02T00:00:00+14:01" ); // invalid: TZ > +14:00
+    doTestTimeF( "0001-01-02T00:00:00-15:00" ); // invalid: TZ < -14:00
+    doTestTimeF( "0001-01-02T00:00:00-14:01" ); // invalid: TZ < -14:00
+    doTestTimeF( "2100-02-29T00:00:00-00:00" ); // invalid: no leap year
+    doTestTimeF( "1900-02-29T00:00:00-00:00" ); // invalid: no leap year
+    doTestTimeF( "T00:00:00" ); // invalid: T
+    doTestTimeF( "0:00:00" ); // invalid: < 2 H
+    doTestTimeF( "00:0:00" ); // invalid: < 2 M
+    doTestTimeF( "00:00:0" ); // invalid: < 2 S
+    doTestTimeF( "00:00:00." ); // invalid: .$
+    doTestTimeF( "00:00:00+1:00" ); // invalid: < 2 TZ H
+    doTestTimeF( "00:00:00+00:1" ); // invalid: < 2 TZ M
+    doTestTimeF( "25:00:00" ); // invalid: H > 24
+    doTestTimeF( "00:60:00" ); // invalid: M > 59
+    doTestTimeF( "00:00:60" ); // invalid: S > 59
+    doTestTimeF( "24:01:00" ); // invalid: H=24, but M != 0
+    doTestTimeF( "24:00:01" ); // invalid: H=24, but S != 0
+    doTestTimeF( "24:00:00.1" ); // invalid: H=24, but H != 0
+    doTestTimeF( "00:00:00+15:00" ); // invalid: TZ > +14:00
+    doTestTimeF( "00:00:00+14:01" ); // invalid: TZ > +14:00
+    doTestTimeF( "00:00:00-15:00" ); // invalid: TZ < -14:00
+    doTestTimeF( "00:00:00-14:01" ); // invalid: TZ < -14:00
+}
+
+void doTestDouble(char const*const pis, double const rd,
+        sal_Int16 const nSourceUnit, sal_Int16 const nTargetUnit)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    double od;
+    bool bSuccess(Converter::convertDouble(od, is, nSourceUnit, nTargetUnit));
+    SAL_INFO("sax.cppunit","" << od);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_DOUBLES_EQUAL(rd, od, 0.00000001);
+    OUStringBuffer buf;
+    Converter::convertDouble(buf, od, true, nTargetUnit, nSourceUnit);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(is, buf.makeStringAndClear());
+}
+
+void ConverterTest::testDouble()
+{
+    doTestDouble("42", 42.0, MeasureUnit::TWIP, MeasureUnit::TWIP);
+    doTestDouble("42", 42.0, MeasureUnit::POINT, MeasureUnit::POINT);
+    doTestDouble("42", 42.0, MeasureUnit::MM_100TH, MeasureUnit::MM_100TH);
+    doTestDouble("42", 42.0, MeasureUnit::MM_10TH, MeasureUnit::MM_10TH);
+    doTestDouble("42", 42.0, MeasureUnit::MM, MeasureUnit::MM); // identity don't seem to add unit?
+    doTestDouble("42", 42.0, MeasureUnit::CM, MeasureUnit::CM);
+    doTestDouble("42", 42.0, MeasureUnit::INCH, MeasureUnit::INCH);
+    doTestDouble("2pt", 40.0, MeasureUnit::POINT, MeasureUnit::TWIP);
+    doTestDouble("20pc", 1, MeasureUnit::TWIP, MeasureUnit::POINT);
+    doTestDouble("4", 2.26771653543307, MeasureUnit::MM_100TH, MeasureUnit::TWIP);
+    doTestDouble("4", 22.6771653543307, MeasureUnit::MM_10TH, MeasureUnit::TWIP);
+    doTestDouble("4mm", 226.771653543307, MeasureUnit::MM, MeasureUnit::TWIP);
+    doTestDouble("4cm", 2267.71653543307, MeasureUnit::CM, MeasureUnit::TWIP);
+    doTestDouble("4in", 5760.0, MeasureUnit::INCH, MeasureUnit::TWIP);
+    doTestDouble("1440pc", 1.0, MeasureUnit::TWIP, MeasureUnit::INCH);
+    doTestDouble("567pc", 1.000125, MeasureUnit::TWIP, MeasureUnit::CM);
+    doTestDouble("56.7pc", 1.000125, MeasureUnit::TWIP, MeasureUnit::MM);
+    doTestDouble("5.67pc", 1.000125, MeasureUnit::TWIP, MeasureUnit::MM_10TH);
+    doTestDouble("0.567pc", 1.000125, MeasureUnit::TWIP, MeasureUnit::MM_100TH);
+    doTestDouble("42pt", 1.4816666666666, MeasureUnit::POINT, MeasureUnit::CM);
+    doTestDouble("42pt", 14.816666666666, MeasureUnit::POINT, MeasureUnit::MM);
+    doTestDouble("42pt", 148.16666666666, MeasureUnit::POINT, MeasureUnit::MM_10TH);
+    doTestDouble("42pt", 1481.6666666666, MeasureUnit::POINT, MeasureUnit::MM_100TH);
+    doTestDouble("72pt", 1.0, MeasureUnit::POINT, MeasureUnit::INCH);
+    doTestDouble("3.5in", 8.89, MeasureUnit::INCH, MeasureUnit::CM);
+    doTestDouble("3.5in", 88.9, MeasureUnit::INCH, MeasureUnit::MM);
+    doTestDouble("3.5in", 889.0, MeasureUnit::INCH, MeasureUnit::MM_10TH);
+    doTestDouble("3.5in", 8890.0, MeasureUnit::INCH, MeasureUnit::MM_100TH);
+    doTestDouble("2in", 144, MeasureUnit::INCH, MeasureUnit::POINT);
+    doTestDouble("5.08cm", 2.0, MeasureUnit::CM, MeasureUnit::INCH);
+    doTestDouble("3.5cm", 3500.0, MeasureUnit::CM, MeasureUnit::MM_100TH);
+    doTestDouble("3.5cm", 350.0, MeasureUnit::CM, MeasureUnit::MM_10TH);
+    doTestDouble("3.5cm", 35.0, MeasureUnit::CM, MeasureUnit::MM);
+    doTestDouble("10cm", 283.464566929134, MeasureUnit::CM, MeasureUnit::POINT);
+    doTestDouble("0.5cm", 283.464566929134, MeasureUnit::CM, MeasureUnit::TWIP);
+    doTestDouble("10mm", 28.3464566929134, MeasureUnit::MM, MeasureUnit::POINT);
+    doTestDouble("0.5mm", 28.3464566929134, MeasureUnit::MM, MeasureUnit::TWIP);
+    doTestDouble("10", 2.83464566929134, MeasureUnit::MM_10TH, MeasureUnit::POINT);
+    doTestDouble("0.5", 2.83464566929134, MeasureUnit::MM_10TH, MeasureUnit::TWIP);
+    doTestDouble("10", 0.283464566929134, MeasureUnit::MM_100TH, MeasureUnit::POINT);
+    doTestDouble("0.5", 0.283464566929134, MeasureUnit::MM_100TH, MeasureUnit::TWIP);
+    doTestDouble("10mm", 1.0, MeasureUnit::MM, MeasureUnit::CM);
+    doTestDouble("10mm", 100.0, MeasureUnit::MM, MeasureUnit::MM_10TH);
+    doTestDouble("20mm", 2000.0, MeasureUnit::MM, MeasureUnit::MM_100TH);
+    doTestDouble("300", 30.0, MeasureUnit::MM_10TH, MeasureUnit::MM);
+    doTestDouble("400", 4.0, MeasureUnit::MM_100TH, MeasureUnit::MM);
+    doTestDouble("600", 6000.0, MeasureUnit::MM_10TH, MeasureUnit::MM_100TH);
+    doTestDouble("700", 70.0, MeasureUnit::MM_100TH, MeasureUnit::MM_10TH);
+}
+
+void doTestStringToMeasure(sal_Int32 rValue, char const*const pis, sal_Int16 nTargetUnit, sal_Int32 nMin, sal_Int32 nMax)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    sal_Int32 nVal;
+    bool bSuccess(Converter::convertMeasure(nVal, is, nTargetUnit, nMin, nMax));
+    SAL_INFO("sax.cppunit","" << nVal);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(rValue, nVal);
+}
+
+void doTestMeasureToString(char const*const pis, sal_Int32 nMeasure, sal_Int16 const nSourceUnit, sal_Int16 const nTargetUnit)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    OUStringBuffer buf;
+    Converter::convertMeasure(buf, nMeasure, nSourceUnit, nTargetUnit);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(is, buf.makeStringAndClear());
+}
+
+void ConverterTest::testMeasure()
+{
+    //check all the measure units
+    doTestStringToMeasure(1000, "10mm", MeasureUnit::MM_100TH, -1, 4321);
+    doTestStringToMeasure(200, "20mm", MeasureUnit::MM_10TH, 12, 4567);
+    doTestStringToMeasure(300, "300", MeasureUnit::MM, 31, 555);
+    doTestStringToMeasure(400, "400", MeasureUnit::CM, 10, 4321);
+    doTestStringToMeasure(120, "120", MeasureUnit::INCH_1000TH, 10, 4321);
+    doTestStringToMeasure(111, "111", MeasureUnit::INCH_100TH, 10, 4321);
+    doTestStringToMeasure(22, "22", MeasureUnit::INCH_10TH, 10, 4321);
+    doTestStringToMeasure(27, "27", MeasureUnit::INCH, 10, 4321);
+    doTestStringToMeasure(52, "52", MeasureUnit::POINT, 10, 4321);
+    doTestStringToMeasure(120, "120", MeasureUnit::TWIP, 10, 4321);
+    doTestStringToMeasure(666, "666", MeasureUnit::M, 10, 4321);
+    doTestStringToMeasure(42, "42", MeasureUnit::KM, 10, 4321);
+    doTestStringToMeasure(30, "30", MeasureUnit::PICA, 10, 4321);
+    doTestStringToMeasure(20, "20", MeasureUnit::FOOT, 10, 4321);
+    doTestStringToMeasure(40, "40", MeasureUnit::MILE, 10, 4321);
+    doTestStringToMeasure(40, "40%", MeasureUnit::PERCENT, 10, 4321);
+    doTestStringToMeasure(800, "800", MeasureUnit::PIXEL, 10, 4321);
+    doTestStringToMeasure(600, "600px", MeasureUnit::PIXEL, 10, 4321);
+    doTestStringToMeasure(777, "777", MeasureUnit::APPFONT, 10, 4321);
+    doTestStringToMeasure(80000, "80000", MeasureUnit::SYSFONT, 10, 432100);
+    //strange values (negative, too large etc.)
+    doTestStringToMeasure(555, "666", MeasureUnit::MM, -1000, 555);
+    doTestStringToMeasure(-1000, "-1001", MeasureUnit::MM, -1000, 555);
+    doTestStringToMeasure(0, "-0", MeasureUnit::MM, -1, 0);
+    doTestStringToMeasure(::std::numeric_limits<sal_Int32>::max(), "1234567890mm", MeasureUnit::MM_10TH, 12, ::std::numeric_limits<sal_Int32>::max());
+    doTestStringToMeasure(-300, "-300", MeasureUnit::MM, -1000, 555);
+    doTestStringToMeasure(::std::numeric_limits<sal_Int32>::min(), "-999999999999999px", MeasureUnit::PIXEL, ::std::numeric_limits<sal_Int32>::min(), 555);   //really crazy numbers...
+
+    doTestMeasureToString("6mm", 600, MeasureUnit::MM_100TH, MeasureUnit::MM);
+    doTestMeasureToString("0.005cm", 000000005, MeasureUnit::MM_100TH, MeasureUnit::CM);    // zeros in the front doesn't count
+    doTestMeasureToString("3mm", 30, MeasureUnit::MM_10TH, MeasureUnit::MM);
+    doTestMeasureToString("6.66cm", 666, MeasureUnit::MM_10TH, MeasureUnit::CM);
+    doTestMeasureToString("-157.3pt", -555, MeasureUnit::MM_10TH, MeasureUnit::POINT);
+    doTestMeasureToString("174976.378in", 44444000, MeasureUnit::MM_10TH, MeasureUnit::INCH);    //let's check accuracy
+    doTestMeasureToString("40%", 40, MeasureUnit::PERCENT, MeasureUnit::PERCENT);
+    doTestMeasureToString("70.56mm", 4000, MeasureUnit::TWIP, MeasureUnit::MM);
+    doTestMeasureToString("979.928cm", 555550, MeasureUnit::TWIP, MeasureUnit::CM);
+    doTestMeasureToString("111.1pt", 2222, MeasureUnit::TWIP, MeasureUnit::POINT);
+    doTestMeasureToString("385.7986in", 555550, MeasureUnit::TWIP, MeasureUnit::INCH);
+    doTestMeasureToString("-2147483.648cm", std::numeric_limits<sal_Int32>::min(), MeasureUnit::MM_100TH, MeasureUnit::CM);
+}
+
+void doTestStringToBool(bool bBool, char const*const pis)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    bool bTemp;
+    bool bSuccess(Converter::convertBool(bTemp, is));
+    SAL_INFO("sax.cppunit","" << bTemp);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(bBool, bTemp);
+
+}
+
+void doTestBoolToString(char const*const pis, bool bValue )
+{
+    OUString const is(OUString::createFromAscii(pis));
+    OUStringBuffer buf;
+    Converter::convertBool(buf, bValue);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(is, buf.makeStringAndClear());
+}
+
+void ConverterTest::testBool()
+{
+    doTestStringToBool(true, "true");
+    doTestStringToBool(false, "false");
+    doTestBoolToString("true", true);
+    doTestBoolToString("false", false);
+}
+
+void doTestStringToPercent(sal_Int32 nValue, char const*const pis)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    sal_Int32 nTemp;
+    bool bSuccess(Converter::convertPercent(nTemp, is));
+    SAL_INFO("sax.cppunit","" << nTemp);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(nValue, nTemp);
+}
+
+void doTestPercentToString(char const*const pis, sal_Int32 nValue)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    OUStringBuffer buf;
+    Converter::convertPercent(buf, nValue);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(is, buf.makeStringAndClear());
+}
+
+void ConverterTest::testPercent()
+{
+    doTestStringToPercent(40, "40%");
+    doTestStringToPercent(30, "30");
+    doTestStringToPercent(120, "120%");
+    doTestStringToPercent(-40, "-40%");
+    doTestStringToPercent(0, "0%");
+    doTestPercentToString("12%", 12);
+    doTestPercentToString("-123%", -123);
+    doTestPercentToString("0%", 0);
+    doTestPercentToString("1%", 00001);
+}
+
+void doTestStringToColor(sal_Int32 nValue, char const*const pis)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    sal_Int32 nTemp;
+    bool bSuccess(Converter::convertColor(nTemp, is));
+    SAL_INFO("sax.cppunit","" << nTemp);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(nValue, nTemp);
+}
+
+void doTestColorToString(char const*const pis, sal_Int32 nValue)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    OUStringBuffer buf;
+    Converter::convertColor(buf, nValue);
+    SAL_INFO("sax.cppunit","" << buf.toString());
+    CPPUNIT_ASSERT_EQUAL(is, buf.makeStringAndClear());
+}
+
+void ConverterTest::testColor()
+{
+    doTestStringToColor(11259375, "#abcdef");
+    doTestStringToColor(160, "#0000a0");
+    doTestStringToColor(40960, "#00a000");
+    doTestStringToColor(0, "#000000");
+    doTestColorToString("#000615", 1557);
+    doTestColorToString("#5bcd15", 123456789);
+    doTestColorToString("#fffac7", -1337);
+    doTestColorToString("#000000", 0);
+}
+
+void doTestStringToNumber(sal_Int32 nValue, char const*const pis, sal_Int32 nMin, sal_Int32 nMax)
+{
+    OUString const is(OUString::createFromAscii(pis));
+    sal_Int32 nTemp;
+    bool bSuccess(Converter::convertNumber(nTemp, is, nMin, nMax));
+    SAL_INFO("sax.cppunit","" << nTemp);
+    CPPUNIT_ASSERT(bSuccess);
+    CPPUNIT_ASSERT_EQUAL(nValue, nTemp);
+}
+
+void ConverterTest::testNumber()
+{
+    doTestStringToNumber(30, "30", 1, 40);
+    doTestStringToNumber(1, "-5", 1, 300);
+    doTestStringToNumber(-30, "7", -100, -30);
+    doTestStringToNumber(0, "-0", 0, 1);
+    doTestStringToNumber(0, "666", -0, 0);
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION(ConverterTest);
+
+}
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/qa/cppunit/xmlimport.cxx b/sax/qa/cppunit/xmlimport.cxx
new file mode 100644
index 0000000000..1eb872d505
--- /dev/null
+++ b/sax/qa/cppunit/xmlimport.cxx
@@ -0,0 +1,454 @@
+/* -*- 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 <sal/types.h>
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/plugin/TestPlugIn.h>
+#include <test/bootstrapfixture.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/beans/Pair.hpp>
+#include <com/sun/star/xml/sax/SAXException.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XFastTokenHandler.hpp>
+#include <comphelper/processfactory.hxx>
+#include <com/sun/star/xml/sax/Parser.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/XLocator.hpp>
+#include <com/sun/star/xml/sax/FastToken.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <osl/file.hxx>
+#include <unotools/ucbstreamhelper.hxx>
+#include <unotools/streamwrap.hxx>
+#include <sax/fastattribs.hxx>
+#include <stack>
+#include <string_view>
+#include <deque>
+#include <rtl/ref.hxx>
+
+
+namespace {
+
+using namespace css;
+using namespace uno;
+using namespace io;
+using namespace xml::sax;
+using namespace ::osl;
+using namespace sax_fastparser;
+
+Reference< XInputStream > createStreamFromFile (
+    const OUString & filePath)
+{
+    Reference<  XInputStream >  xInputStream;
+    OUString aInStr;
+    FileBase::getFileURLFromSystemPath(filePath, aInStr);
+    std::unique_ptr<SvStream> pStream = utl::UcbStreamHelper::CreateStream(aInStr, StreamMode::READ);
+    if(pStream == nullptr)
+        CPPUNIT_ASSERT(false);
+    Reference< XStream > xStream(new utl::OStreamWrapper(std::move(pStream)));
+    xInputStream.set(xStream, UNO_QUERY);
+    return xInputStream;
+}
+
+class TestDocumentHandler : public cppu::WeakImplHelper< XDocumentHandler >
+{
+private:
+    OUString m_aStr;
+    std::deque< std::pair<OUString,OUString> > m_aNamespaceStack;
+    std::stack<sal_uInt16> m_aCountStack;
+
+    OUString canonicalform(const OUString &sName, const OUString &sValue, bool isElement);
+    OUString getNamespace(std::u16string_view sName);
+
+public:
+    TestDocumentHandler() {}
+    const OUString & getString() const { return m_aStr; }
+
+    // XDocumentHandler
+    virtual void SAL_CALL startDocument() override;
+    virtual void SAL_CALL endDocument() override;
+    virtual void SAL_CALL startElement( const OUString& aName, const Reference< XAttributeList >& xAttribs ) override;
+    virtual void SAL_CALL endElement( const OUString& aName ) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+    virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override;
+    virtual void SAL_CALL processingInstruction( const OUString& aTarget, const OUString& aData ) override;
+    virtual void SAL_CALL setDocumentLocator( const Reference< XLocator >& xLocator ) override;
+};
+
+OUString TestDocumentHandler::canonicalform(const OUString &sName, const OUString &sValue, bool isElement)
+{
+    sal_Int16 nIndex = sName.indexOf(":");
+    if ( !isElement && sName.match( "xmlns" ) )
+    {
+        m_aCountStack.top() += 1;
+        if ( nIndex < 0 )
+            m_aNamespaceStack.emplace_back( OUString( "default" ), sValue );
+        else
+            m_aNamespaceStack.emplace_back( sName.copy( nIndex + 1 ), sValue );
+    }
+    else
+    {
+        if ( nIndex >= 0 )
+        {
+            OUString sNamespace = getNamespace( sName.subView( 0, nIndex ) );
+            return sNamespace + sName.subView(nIndex);
+        }
+        else
+        {
+            OUString sDefaultns = getNamespace( u"default" );
+            if ( !isElement || sDefaultns.isEmpty() )
+                return sName;
+            else
+                return sDefaultns + ":" + sName;
+        }
+    }
+    return OUString();
+}
+
+OUString TestDocumentHandler::getNamespace(std::u16string_view sName)
+{
+    for (sal_Int16 i = m_aNamespaceStack.size() - 1; i>=0; i--)
+    {
+        std::pair<OUString, OUString> aPair = m_aNamespaceStack.at(i);
+        if (aPair.first == sName)
+            return aPair.second;
+    }
+    return OUString();
+}
+
+void SAL_CALL TestDocumentHandler::startDocument()
+{
+    m_aStr.clear();
+    m_aNamespaceStack.clear();
+    m_aNamespaceStack.emplace_back( std::make_pair( OUString( "default" ), OUString() ) );
+    m_aCountStack = std::stack<sal_uInt16>();
+    m_aCountStack.emplace(0);
+}
+
+
+void SAL_CALL TestDocumentHandler::endDocument()
+{
+}
+
+void SAL_CALL TestDocumentHandler::startElement( const OUString& aName, const Reference< XAttributeList >& xAttribs )
+{
+    OUString sAttributes;
+    m_aCountStack.push(0);
+    sal_uInt16 len = xAttribs->getLength();
+    for (sal_uInt16 i=0; i<len; i++)
+    {
+        OUString sAttrValue = xAttribs->getValueByIndex(i);
+        OUString sAttrName = canonicalform(xAttribs->getNameByIndex(i), sAttrValue, false);
+        if (!sAttrName.isEmpty())
+            sAttributes += sAttrName + sAttrValue;
+    }
+    m_aStr += canonicalform(aName, "", true) + sAttributes;
+}
+
+
+void SAL_CALL TestDocumentHandler::endElement( const OUString& aName )
+{
+    m_aStr += canonicalform(aName, "", true);
+    sal_uInt16 nPopQty = m_aCountStack.top();
+    for (sal_uInt16 i=0; i<nPopQty; i++)
+        m_aNamespaceStack.pop_back();
+    m_aCountStack.pop();
+}
+
+
+void SAL_CALL TestDocumentHandler::characters( const OUString& aChars )
+{
+    m_aStr += aChars;
+}
+
+
+void SAL_CALL TestDocumentHandler::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    m_aStr += aWhitespaces;
+}
+
+
+void SAL_CALL TestDocumentHandler::processingInstruction( const OUString& aTarget, const OUString& aData )
+{
+    m_aStr += aTarget + aData;
+}
+
+
+void SAL_CALL TestDocumentHandler::setDocumentLocator( const Reference< XLocator >& /*xLocator*/ )
+{
+}
+
+class NSDocumentHandler : public cppu::WeakImplHelper< XDocumentHandler >
+{
+public:
+    NSDocumentHandler() {}
+
+    // XDocumentHandler
+    virtual void SAL_CALL startDocument() override {}
+    virtual void SAL_CALL endDocument() override {}
+    virtual void SAL_CALL startElement( const OUString& aName, const Reference< XAttributeList >& xAttribs ) override;
+    virtual void SAL_CALL endElement( const OUString& /* aName */ ) override {}
+    virtual void SAL_CALL characters( const OUString& /* aChars */ ) override {}
+    virtual void SAL_CALL ignorableWhitespace( const OUString& /* aWhitespaces */ ) override {}
+    virtual void SAL_CALL processingInstruction( const OUString& /* aTarget */, const OUString& /* aData */ ) override {}
+    virtual void SAL_CALL setDocumentLocator( const Reference< XLocator >& /* xLocator */ ) override {}
+};
+
+OUString getNamespaceValue( std::u16string_view rNamespacePrefix )
+{
+    OUString aNamespaceURI;
+    if (rNamespacePrefix == u"office")
+        aNamespaceURI = "urn:oasis:names:tc:opendocument:xmlns:office:1.0";
+    else if (rNamespacePrefix == u"text")
+        aNamespaceURI = "urn:oasis:names:tc:opendocument:xmlns:text:1.0";
+    else if (rNamespacePrefix == u"note")
+        aNamespaceURI = "urn:oasis:names:tc:opendocument:xmlns:text:1.0";
+    return aNamespaceURI;
+}
+
+OUString resolveNamespace( const OUString& aName )
+{
+    int index;
+    if (( index = aName.indexOf( ':' )) > 0 )
+    {
+        if ( aName.getLength() > index + 1 )
+        {
+            OUString aAttributeName = getNamespaceValue( aName.subView( 0, index ) ) +
+                ":" + aName.subView( index + 1 );
+            return aAttributeName;
+        }
+    }
+    return aName;
+}
+
+void SAL_CALL NSDocumentHandler::startElement( const OUString& aName, const Reference< XAttributeList >&/* xAttribs */ )
+{
+    if (! (aName == "office:document" || aName == "office:body" || aName == "office:text" ||
+        aName == "text:p" || aName == "note:p") )
+        CPPUNIT_ASSERT(false);
+
+    OUString sResolvedName = resolveNamespace(aName);
+    if (! ( sResolvedName == "urn:oasis:names:tc:opendocument:xmlns:office:1.0:document" ||
+        sResolvedName == "urn:oasis:names:tc:opendocument:xmlns:office:1.0:body" ||
+        sResolvedName == "urn:oasis:names:tc:opendocument:xmlns:office:1.0:text" ||
+        sResolvedName == "urn:oasis:names:tc:opendocument:xmlns:text:1.0:p") )
+        CPPUNIT_ASSERT(false);
+}
+
+class DummyTokenHandler : public sax_fastparser::FastTokenHandlerBase
+{
+public:
+    const static std::string_view tokens[];
+    const static std::u16string_view namespaceURIs[];
+    const static std::string_view namespacePrefixes[];
+
+    // XFastTokenHandler
+    virtual Sequence< sal_Int8 > SAL_CALL getUTF8Identifier( sal_Int32 nToken ) override;
+    virtual sal_Int32 SAL_CALL getTokenFromUTF8( const css::uno::Sequence< sal_Int8 >& Identifier ) override;
+    //FastTokenHandlerBase
+    virtual sal_Int32 getTokenDirect( const char *pToken, sal_Int32 nLength ) const override;
+};
+
+const std::string_view DummyTokenHandler::tokens[] = {
+    "Signature", "CanonicalizationMethod",
+    "Algorithm", "Type",
+    "DigestMethod", "Reference",
+    "document", "spacing",
+    "Player", "Height" };
+
+const std::u16string_view DummyTokenHandler::namespaceURIs[] = {
+    u"http://www.w3.org/2000/09/xmldsig#",
+    u"http://schemas.openxmlformats.org/wordprocessingml/2006/main/",
+    u"xyzsports.com/players/football/" };
+
+const std::string_view DummyTokenHandler::namespacePrefixes[] = {
+    "",
+    "w",
+    "Player" };
+
+Sequence< sal_Int8 > DummyTokenHandler::getUTF8Identifier( sal_Int32 nToken )
+{
+    std::string_view aUtf8Token;
+    if ( ( nToken & 0xffff0000 ) != 0 ) //namespace
+    {
+        sal_uInt32 nNamespaceToken = ( nToken >> 16 ) - 1;
+        if ( nNamespaceToken < std::size(namespacePrefixes) )
+            aUtf8Token = namespacePrefixes[ nNamespaceToken ];
+    }
+    else //element or attribute
+    {
+        size_t nElementToken = nToken & 0xffff;
+        if ( nElementToken < std::size(tokens) )
+            aUtf8Token = tokens[ nElementToken ];
+    }
+    Sequence< sal_Int8 > aSeq( reinterpret_cast< const sal_Int8* >(
+                aUtf8Token.data() ), aUtf8Token.size() );
+    return aSeq;
+}
+
+sal_Int32 DummyTokenHandler::getTokenFromUTF8( const uno::Sequence< sal_Int8 >& rIdentifier )
+{
+    return getTokenDirect( reinterpret_cast< const char* >(
+                    rIdentifier.getConstArray() ), rIdentifier.getLength() );
+}
+
+sal_Int32 DummyTokenHandler::getTokenDirect( const char* pToken, sal_Int32 nLength ) const
+{
+    std::string_view sToken( pToken, nLength );
+    for( size_t  i = 0; i < std::size(tokens); i++ )
+    {
+        if ( tokens[i] == sToken )
+            return static_cast<sal_Int32>(i);
+    }
+    return FastToken::DONTKNOW;
+}
+
+
+class XMLImportTest : public test::BootstrapFixture
+{
+private:
+    OUString m_sDirPath;
+    rtl::Reference< TestDocumentHandler > m_xDocumentHandler;
+    Reference< XParser > m_xParser;
+    Reference< XParser > m_xLegacyFastParser;
+
+public:
+    virtual void setUp() override;
+
+    XMLImportTest() : BootstrapFixture(true, false) {}
+    void parse();
+    void testMissingNamespaceDeclaration();
+    void testIllegalNamespaceUse();
+
+    CPPUNIT_TEST_SUITE( XMLImportTest );
+    CPPUNIT_TEST( parse );
+    CPPUNIT_TEST( testMissingNamespaceDeclaration );
+    CPPUNIT_TEST( testIllegalNamespaceUse );
+    CPPUNIT_TEST_SUITE_END();
+};
+
+void XMLImportTest::setUp()
+{
+    test::BootstrapFixture::setUp();
+    Reference< XComponentContext > xContext = comphelper::getProcessComponentContext();
+    m_xDocumentHandler.set( new TestDocumentHandler() );
+    m_xParser = Parser::create( xContext );
+    m_xParser->setDocumentHandler( m_xDocumentHandler );
+    m_xLegacyFastParser.set( xContext->getServiceManager()->createInstanceWithContext
+                    ( "com.sun.star.xml.sax.LegacyFastParser", xContext ), UNO_QUERY );
+    m_xLegacyFastParser->setDocumentHandler( m_xDocumentHandler );
+
+    Reference< XFastTokenHandler > xTokenHandler;
+    xTokenHandler.set( new DummyTokenHandler );
+    uno::Reference<lang::XInitialization> const xInit(m_xLegacyFastParser,
+                            uno::UNO_QUERY_THROW);
+    xInit->initialize({ uno::Any(xTokenHandler) });
+
+    sal_Int32 nNamespaceCount = SAL_N_ELEMENTS(DummyTokenHandler::namespaceURIs);
+    uno::Sequence<uno::Any> namespaceArgs( nNamespaceCount + 1 );
+    auto p_namespaceArgs = namespaceArgs.getArray();
+    p_namespaceArgs[0] <<= OUString( "registerNamespaces" );
+    for (sal_Int32 i = 1; i <= nNamespaceCount; i++ )
+    {
+        css::beans::Pair<OUString, sal_Int32> rPair( OUString(DummyTokenHandler::namespaceURIs[i - 1]), i << 16 );
+        p_namespaceArgs[i] <<= rPair;
+    }
+    xInit->initialize( namespaceArgs );
+
+    m_sDirPath = m_directories.getPathFromSrc( u"/sax/qa/data/" );
+}
+
+void XMLImportTest::parse()
+{
+    OUString fileNames[] = {"simple.xml", "defaultns.xml", "inlinens.xml",
+                            "multiplens.xml", "multiplepfx.xml",
+                            "nstoattributes.xml", "nestedns.xml", "testthreading.xml"};
+
+    for (size_t i = 0; i < std::size( fileNames ); i++)
+    {
+        InputSource source;
+        source.sSystemId    = "internal";
+
+        source.aInputStream = createStreamFromFile( m_sDirPath + fileNames[i] );
+        m_xParser->parseStream(source);
+        const OUString rParserStr = m_xDocumentHandler->getString();
+
+        source.aInputStream = createStreamFromFile( m_sDirPath + fileNames[i] );
+        m_xLegacyFastParser->parseStream(source);
+        const OUString rLegacyFastParserStr = m_xDocumentHandler->getString();
+
+        CPPUNIT_ASSERT_EQUAL( rParserStr, rLegacyFastParserStr );
+        // OString o = OUStringToOString( Str, RTL_TEXTENCODING_ASCII_US );
+        // CPPUNIT_ASSERT_MESSAGE( string(o.pData->buffer), false );
+    }
+}
+
+void XMLImportTest::testMissingNamespaceDeclaration()
+{
+    OUString fileNames[] = { "manifestwithnsdecl.xml", "manifestwithoutnsdecl.xml" };
+
+    uno::Reference<lang::XInitialization> const xInit(m_xLegacyFastParser,
+                            uno::UNO_QUERY_THROW);
+    xInit->initialize({ uno::Any(OUString("IgnoreMissingNSDecl")) });
+
+    for (sal_uInt16 i = 0; i < std::size( fileNames ); i++)
+    {
+        try
+        {
+            InputSource source;
+            source.sSystemId    = "internal";
+
+            source.aInputStream = createStreamFromFile( m_sDirPath + fileNames[i] );
+            m_xParser->parseStream(source);
+            const OUString rParserStr = m_xDocumentHandler->getString();
+
+            source.aInputStream = createStreamFromFile( m_sDirPath + fileNames[i] );
+            m_xLegacyFastParser->parseStream(source);
+            const OUString rLegacyFastParserStr = m_xDocumentHandler->getString();
+
+            CPPUNIT_ASSERT_EQUAL( rParserStr, rLegacyFastParserStr );
+        }
+        catch( const SAXException & )
+        {
+        }
+    }
+}
+
+void XMLImportTest::testIllegalNamespaceUse()
+{
+    rtl::Reference< NSDocumentHandler > m_xNSDocumentHandler;
+    m_xNSDocumentHandler.set( new NSDocumentHandler() );
+    m_xParser->setDocumentHandler( m_xNSDocumentHandler );
+    InputSource source;
+    source.sSystemId    = "internal";
+
+    source.aInputStream = createStreamFromFile( m_sDirPath + "multiplepfx.xml" );
+    m_xParser->parseStream(source);
+
+    m_xLegacyFastParser->setDocumentHandler( m_xNSDocumentHandler );
+    source.aInputStream = createStreamFromFile( m_sDirPath + "multiplepfx.xml" );
+    m_xLegacyFastParser->parseStream(source);
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION( XMLImportTest );
+} //namespace
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/qa/data/defaultns.xml b/sax/qa/data/defaultns.xml
new file mode 100644
index 0000000000..2e7819b164
--- /dev/null
+++ b/sax/qa/data/defaultns.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" ?>
+<Books xmlns="http://xyzbooks.com/books/">
+    <Book>
+        <Title>War and Peace</Title>
+        <Author>Leo Tolstoy</Author>
+    </Book>
+    <Book>
+        <Title>To Kill a Mockingbird</Title>
+        <Author>Harper Lee</Author>
+    </Book>
+</Books>
diff --git a/sax/qa/data/inlinens.xml b/sax/qa/data/inlinens.xml
new file mode 100644
index 0000000000..02c4214085
--- /dev/null
+++ b/sax/qa/data/inlinens.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" ?>
+<Students xmlns="http://xyzuniversity.org/student/">
+    <Student xmlns:ug="http://xyzuniversity.org/student/ug/">
+        <Name>ABC</Name>
+        <ug:Branch>Computer Science</ug:Branch>
+        <ug:Grade>7.9</ug:Grade>
+    </Student>
+    <Student  xmlns:pg="http://xyzuniversity.org/student/pg/">
+        <Name>PQR</Name>
+        <pg:Field>Artificial Intelligence</pg:Field>
+    </Student>
+</Students>
+\ No newline at end of file
diff --git a/sax/qa/data/manifestwithnsdecl.xml b/sax/qa/data/manifestwithnsdecl.xml
new file mode 100644
index 0000000000..ac61c3e206
--- /dev/null
+++ b/sax/qa/data/manifestwithnsdecl.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest:manifest xmlns:manifest="urn:oasis:names:tc:opendocument:xmlns:manifest:1.0" manifest:version="1.2">
+  <manifest:file-entry manifest:full-path="/" manifest:version="1.2" manifest:media-type="application/vnd.oasis.opendocument.text"/>
+  <manifest:file-entry manifest:full-path="Thumbnails/thumbnail.png" manifest:media-type="image/png"/>
+  <manifest:file-entry manifest:full-path="content.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="styles.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="meta.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="settings.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="Configurations2/accelerator/current.xml" manifest:media-type=""/>
+  <manifest:file-entry manifest:full-path="Configurations2/" manifest:media-type="application/vnd.sun.xml.ui.configuration"/>
+  <manifest:file-entry manifest:full-path="manifest.rdf" manifest:media-type="application/rdf+xml"/>
+</manifest:manifest>
diff --git a/sax/qa/data/manifestwithoutnsdecl.xml b/sax/qa/data/manifestwithoutnsdecl.xml
new file mode 100644
index 0000000000..1c8f535963
--- /dev/null
+++ b/sax/qa/data/manifestwithoutnsdecl.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest:manifest>
+  <manifest:file-entry manifest:full-path="/" manifest:version="1.2" manifest:media-type="application/vnd.oasis.opendocument.text"/>
+  <manifest:file-entry manifest:full-path="Thumbnails/thumbnail.png" manifest:media-type="image/png"/>
+  <manifest:file-entry manifest:full-path="content.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="styles.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="meta.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="settings.xml" manifest:media-type="text/xml"/>
+  <manifest:file-entry manifest:full-path="Configurations2/accelerator/current.xml" manifest:media-type=""/>
+  <manifest:file-entry manifest:full-path="Configurations2/" manifest:media-type="application/vnd.sun.xml.ui.configuration"/>
+  <manifest:file-entry manifest:full-path="manifest.rdf" manifest:media-type="application/rdf+xml"/>
+</manifest:manifest>
diff --git a/sax/qa/data/multiplens.xml b/sax/qa/data/multiplens.xml
new file mode 100644
index 0000000000..e1dc4ce01e
--- /dev/null
+++ b/sax/qa/data/multiplens.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" ?>
+<Athletes>
+    <Player xmlns:Player="xyzsports.com/players/football/">
+        <Player:Name>Lionel Messi</Player:Name>
+        <Player:Height>1.70 m</Player:Height>
+        <Player:Position>Forward</Player:Position>
+    </Player>
+    <Player xmlns:Player="xyzsports.com/players/Cricket/">
+        <Player:Name>Sachin Ramesh Tendulkar</Player:Name>
+        <Player:Height>165 cm</Player:Height>
+        <Player:Style>Right handed</Player:Style>
+    </Player>
+</Athletes>
+\ No newline at end of file
diff --git a/sax/qa/data/multiplepfx.xml b/sax/qa/data/multiplepfx.xml
new file mode 100644
index 0000000000..b7686cad5f
--- /dev/null
+++ b/sax/qa/data/multiplepfx.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" ?>
+<office:document xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0">
+    <office:body>
+        <office:text>
+            <text:p xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" text:style-name="Title">Test Document </text:p>
+            <note:p xmlns:note="urn:oasis:names:tc:opendocument:xmlns:text:1.0" note:style-name="Heading">For testing purposes only</note:p>
+        </office:text>
+    </office:body>
+</office:document>
diff --git a/sax/qa/data/nestedns.xml b/sax/qa/data/nestedns.xml
new file mode 100644
index 0000000000..566332b40a
--- /dev/null
+++ b/sax/qa/data/nestedns.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" ?>
+<?pi-target pi-data?>
+<Elements>
+    <Book xmlns:lib="http://www.library.com/">
+        <lib:Title>Sherlock Holmes - I</lib:Title>
+        <lib:Author>Arthur Conan Doyle</lib:Author>
+        <purchase xmlns:lib="http://www.otherlibrary.com/">
+            <lib:Title>Sherlock Holmes - II</lib:Title>
+            <lib:Author>Arthur Conan Doyle</lib:Author>
+        </purchase>
+        <lib:Title>Sherlock Holmes - III</lib:Title>
+        <lib:Author>Arthur Conan Doyle</lib:Author>
+    </Book>
+    <Electronics xmlns="http://doesntexist.com/electronics/">
+        <item>
+            <Name>Apple iPhone 6s</Name>
+            <?pi-target-only?>
+            <Price>$324</Price>
+        </item>
+        <item xmlns="http://doesntexist.com/dailyuse/">
+            <Name>Philips Aqua Touch Shaver</Name>
+            <item xmlns="http://doesntexist.com/dailyuse/model/">
+                <Model>AT890</Model>
+                <Price>$74</Price>
+            </item>
+        </item>
+        <item>
+            <Name>Macbook Pro</Name>
+            <Price>$500</Price>
+        </item>
+    </Electronics>
+</Elements>
+\ No newline at end of file
diff --git a/sax/qa/data/nstoattributes.xml b/sax/qa/data/nstoattributes.xml
new file mode 100644
index 0000000000..dee2edfdcb
--- /dev/null
+++ b/sax/qa/data/nstoattributes.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" ?>
+<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main/">
+    <w:body>
+        <w:p w:rsidR="009A1A3D" w:rsidRPr="00BA52A7" w:rsidRDefault="00225691" w:rsidP="00BA52A7">
+            <w:pPr xyz="abc">
+                <w:spacing w:line="276" w:lineRule="auto"/>
+            <w:rPr>
+                <w:rFonts w:asciiTheme="minorHAnsi" w:hAnsiTheme="minorHAnsi"/>
+                <w:sz w:val="24" val="27" />
+                <w:szCs w:val="24"/>
+            </w:rPr>
+            </w:pPr>
+            <w:bookmarkStart w:id="0" w:name="page1"/>
+            <w:bookmarkEnd w:id="0"/>
+        </w:p>
+    </w:body>
+</w:document>
+\ No newline at end of file
diff --git a/sax/qa/data/simple.xml b/sax/qa/data/simple.xml
new file mode 100644
index 0000000000..67c4fbde57
--- /dev/null
+++ b/sax/qa/data/simple.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" ?>
+<TVActors>
+    <Actor>
+        <Name>Bryan Cranston</Name>
+        <Show>Breaking Bad</Show>
+    </Actor>
+    <Actor>
+        <Name>Peter Dinklage</Name>
+        <Show>Game of Thrones</Show>
+    </Actor>
+</TVActors>
+\ No newline at end of file
diff --git a/sax/qa/data/testthreading.xml b/sax/qa/data/testthreading.xml
new file mode 100644
index 0000000000..0d05fd9959
--- /dev/null
+++ b/sax/qa/data/testthreading.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?><Signature xmlns="http://www.w3.org/2000/09/xmldsig#" Id="idPackageSignature"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/><SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><Reference Type="http://www.w3.org/2000/09/xmldsig#Object" URI="#idPackageObject"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>NOjlH6v6g2ojDvQoi4M5B8Bght0y3ES4fjxlRk2xtVE=</DigestValue></Reference><Reference Type="http://www.w3.org/2000/09/xmldsig#Object" URI="#idOfficeObject"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>mq1H1GLrTZSuUUTqX5HpjytFwl8nJFggNsXJUgQZT0U=</DigestValue></Reference><Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#idSignedProperties"><Transforms><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>6jeT5n6jeqOspz6K6BIgitwfLZf4s1/uS9dPdOQRF8s=</DigestValue></Reference></SignedInfo><SignatureValue>UZwOWZbOm9ysRa+eYwoksUW8d+jBFPOkqOtfTvT8waHWDe3siDc4N79W6jPCYMIHMtPQjCb4qMDe
+dhCYvg6TTWFWCvU/br+A1Qo0xovWHD3DwB29qk7NDBfbnEIPxbOe2D70cZa86Zl2MgW5YqQlgRFH
+g6+XxwBUp+ZYx4knFWEg8zgbe3JnV7zeI/RG/1iq9TYH1GUBloF10df4qaulrp2AUkdSvnnUcxRP
+ZfbS+14YxUHkW0UTyV+6ZeXqtTnXS0F/LG5JH2/xkN+mgwLB6TPfxtQD6vcj+Tdnf0hHlnuOmvBS
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Id="idPackageObject"><Manifest><Reference URI="/_rels/.rels?ContentType=application/vnd.openxmlformats-package.relationships+xml"><Transforms><Transform Algorithm="http://schemas.openxmlformats.org/package/2006/RelationshipTransform"><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId1"/></Transform><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>Mq3mDDWudLiaQFa1psBgLG+/en7p7r8re0MtlxnuiUI=</DigestValue></Reference><Reference URI="/word/_rels/document.xml.rels?ContentType=application/vnd.openxmlformats-package.relationships+xml"><Transforms><Transform Algorithm="http://schemas.openxmlformats.org/package/2006/RelationshipTransform"><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId2"/><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId1"/><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId5"/><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId4"/><mdssi:RelationshipReference xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" SourceId="rId3"/></Transform><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>fLpr0+BDSSPPgsv2eBghgw8hu/vi7IslCQuCSKGf2X4=</DigestValue></Reference><Reference URI="/word/document.xml?ContentType=application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>7Hrf+Oz9oMcqn7nOKgy1P39L313r8SO/pT3wQpVwq5k=</DigestValue></Reference><Reference URI="/word/fontTable.xml?ContentType=application/vnd.openxmlformats-officedocument.wordprocessingml.fontTable+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>VZENondrzBVuF5GsYtsdSYgGNQS11L4XQ7vYiTn5PBE=</DigestValue></Reference><Reference URI="/word/settings.xml?ContentType=application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>nYb+Wnf/ttBtq0PSR33tt+yKzvx6RdYmtEhD3XnBwaI=</DigestValue></Reference><Reference URI="/word/styles.xml?ContentType=application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>4W+Exf0d9q8aHyBJ94YvTqRgdlhjR2r7F+eO3udy01s=</DigestValue></Reference><Reference URI="/word/theme/theme1.xml?ContentType=application/vnd.openxmlformats-officedocument.theme+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>L8HrIbYZUORASW6Jbsljhmie2tLKO9ld8ME0syr+ZDE=</DigestValue></Reference><Reference URI="/word/webSettings.xml?ContentType=application/vnd.openxmlformats-officedocument.wordprocessingml.webSettings+xml"><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>8JastnM5t30OLdmv2PyPNOe1YxAXc/Qz0O1UCFnWyxM=</DigestValue></Reference></Manifest><SignatureProperties><SignatureProperty Id="idSignatureTime" Target="#idPackageSignature"><mdssi:SignatureTime xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature"><mdssi:Format>YYYY-MM-DDThh:mm:ssTZD</mdssi:Format><mdssi:Value>2016-01-11T15:32:02Z</mdssi:Value></mdssi:SignatureTime></SignatureProperty></SignatureProperties></Object><Object Id="idOfficeObject"><SignatureProperties><SignatureProperty Id="idOfficeV1Details" Target="#idPackageSignature"><SignatureInfoV1 xmlns="http://schemas.microsoft.com/office/2006/digsig"><SetupID></SetupID><SignatureText></SignatureText><SignatureImage/><SignatureComments>purpose</SignatureComments><WindowsVersion>6.1</WindowsVersion><OfficeVersion>16.0</OfficeVersion><ApplicationVersion>16.0</ApplicationVersion><Monitors>1</Monitors><HorizontalResolution>1280</HorizontalResolution><VerticalResolution>800</VerticalResolution><ColorDepth>32</ColorDepth><SignatureProviderId>{00000000-0000-0000-0000-000000000000}</SignatureProviderId><SignatureProviderUrl></SignatureProviderUrl><SignatureProviderDetails>9</SignatureProviderDetails><SignatureType>1</SignatureType></SignatureInfoV1></SignatureProperty></SignatureProperties></Object><Object><xd:QualifyingProperties xmlns:xd="http://uri.etsi.org/01903/v1.3.2#" Target="#idPackageSignature"><xd:SignedProperties Id="idSignedProperties"><xd:SignedSignatureProperties><xd:SigningTime>2016-01-11T15:32:02Z</xd:SigningTime><xd:SigningCertificate><xd:Cert><xd:CertDigest><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>VRk3WQgpNIAnRxA9txzm7L2v1Iuwu2WrHpwa5WNTKV0=</DigestValue></xd:CertDigest><xd:IssuerSerial><X509IssuerName>CN=TSCP Intermediate Root CA, O=TSCP Test, S=England, C=UK</X509IssuerName><X509SerialNumber>4096</X509SerialNumber></xd:IssuerSerial></xd:Cert></xd:SigningCertificate><xd:SignaturePolicyIdentifier><xd:SignaturePolicyImplied/></xd:SignaturePolicyIdentifier></xd:SignedSignatureProperties></xd:SignedProperties><xd:UnsignedProperties><xd:UnsignedSignatureProperties><xd:CertificateValues><xd:EncapsulatedX509Certificate>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</xd:EncapsulatedX509Certificate><xd:EncapsulatedX509Certificate>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</xd:EncapsulatedX509Certificate></xd:CertificateValues></xd:UnsignedSignatureProperties></xd:UnsignedProperties></xd:QualifyingProperties></Object></Signature>
+\ No newline at end of file
diff --git a/sax/source/expatwrap/expwrap.component b/sax/source/expatwrap/expwrap.component
new file mode 100644
index 0000000000..1f72eccf31
--- /dev/null
+++ b/sax/source/expatwrap/expwrap.component
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * 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 .
+ -->
+
+<component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
+    xmlns="http://openoffice.org/2010/uno-components">
+  <implementation name="com.sun.star.comp.extensions.xml.sax.ParserExpat"
+      constructor="com_sun_star_comp_extensions_xml_sax_ParserExpat_get_implementation">
+    <service name="com.sun.star.xml.sax.Parser"/>
+  </implementation>
+  <implementation name="com.sun.star.extensions.xml.sax.Writer"
+      constructor="com_sun_star_extensions_xml_sax_Writer_get_implementation">
+    <service name="com.sun.star.xml.sax.Writer"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.extensions.xml.sax.FastParser"
+      constructor="com_sun_star_comp_extensions_xml_sax_FastParser_get_implementation">
+     <service name="com.sun.star.xml.sax.FastParser"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.extensions.xml.sax.LegacyFastParser"
+      constructor="com_sun_star_comp_extensions_xml_sax_LegacyFastParser_get_implementation">
+     <service name="com.sun.star.xml.sax.LegacyFastParser"/>
+  </implementation>
+</component>
diff --git a/sax/source/expatwrap/sax_expat.cxx b/sax/source/expatwrap/sax_expat.cxx
new file mode 100644
index 0000000000..9a82b87036
--- /dev/null
+++ b/sax/source/expatwrap/sax_expat.cxx
@@ -0,0 +1,957 @@
+/* -*- 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 <string.h>
+#include <cassert>
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <string_view>
+#include <vector>
+
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+
+#include <comphelper/attributelist.hxx>
+#include <cppuhelper/weak.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/ref.hxx>
+#include <sal/log.hxx>
+
+#include <expat.h>
+#include <xml2utf.hxx>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::xml::sax;
+using namespace ::com::sun::star::io;
+
+
+namespace {
+
+#define XML_CHAR_TO_OUSTRING(x) OUString(x , strlen( x ), RTL_TEXTENCODING_UTF8)
+#define XML_CHAR_N_TO_USTRING(x,n) OUString(x,n, RTL_TEXTENCODING_UTF8 )
+
+
+/*
+* The following macro encapsulates any call to an event handler.
+* It ensures, that exceptions thrown by the event handler are
+* treated properly.
+*/
+#define CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(pThis,call) \
+    if( ! pThis->bExceptionWasThrown ) { \
+        try {\
+            pThis->call;\
+        }\
+        catch( const SAXParseException &e ) {\
+            callErrorHandler( pThis ,  e );\
+         }\
+        catch( const SAXException &e ) {\
+            callErrorHandler( pThis , SAXParseException(\
+                                            e.Message, \
+                                            e.Context, \
+                                            e.WrappedException,\
+                                            pThis->rDocumentLocator->getPublicId(),\
+                                            pThis->rDocumentLocator->getSystemId(),\
+                                            pThis->rDocumentLocator->getLineNumber(),\
+                                            pThis->rDocumentLocator->getColumnNumber()\
+                                     ) );\
+        }\
+        catch( const css::uno::RuntimeException &e ) {\
+            pThis->bExceptionWasThrown = true; \
+            pThis->bRTExceptionWasThrown = true; \
+            pImpl->rtexception = e; \
+        }\
+        catch( const css::uno::Exception &e ) {\
+            pThis->bExceptionWasThrown = true; \
+            pThis->bRTExceptionWasThrown = true; \
+            pImpl->rtexception = WrappedTargetRuntimeException("Non-runtime UNO exception caught during parse", e.Context, css::uno::Any(e)); \
+        }\
+    }\
+    ((void)0)
+
+
+class SaxExpatParser_Impl;
+
+// This class implements the external Parser interface
+class SaxExpatParser
+    : public WeakImplHelper< XInitialization
+                            , XServiceInfo
+                            , XParser >
+{
+
+public:
+    SaxExpatParser();
+
+    // css::lang::XInitialization:
+    virtual void SAL_CALL initialize(css::uno::Sequence<css::uno::Any> const& rArguments) override;
+
+    // The SAX-Parser-Interface
+    virtual void SAL_CALL parseStream(  const InputSource& structSource) override;
+    virtual void SAL_CALL setDocumentHandler(const css::uno::Reference< XDocumentHandler > & xHandler) override;
+
+    virtual void SAL_CALL setErrorHandler(const css::uno::Reference< XErrorHandler > & xHandler) override;
+    virtual void SAL_CALL setDTDHandler(const css::uno::Reference < XDTDHandler > & xHandler) override;
+    virtual void SAL_CALL setEntityResolver(const css::uno::Reference<  XEntityResolver >& xResolver) override;
+
+    virtual void SAL_CALL setLocale( const Locale &locale ) override;
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    css::uno::Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                     SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+    std::unique_ptr<SaxExpatParser_Impl>   m_pImpl;
+};
+
+
+// Entity binds all information needed for a single file
+struct Entity
+{
+    InputSource         structSource;
+    XML_Parser          pParser;
+    sax_expatwrap::XMLFile2UTFConverter converter;
+};
+
+
+class SaxExpatParser_Impl
+{
+public: // module scope
+    std::mutex aMutex;
+    bool m_bEnableDoS; // fdo#60471 thank you Adobe Illustrator
+
+    css::uno::Reference< XDocumentHandler >   rDocumentHandler;
+    css::uno::Reference< XExtendedDocumentHandler > rExtendedDocumentHandler;
+
+    css::uno::Reference< XErrorHandler >  rErrorHandler;
+    css::uno::Reference< XDTDHandler >    rDTDHandler;
+    css::uno::Reference< XEntityResolver > rEntityResolver;
+    css::uno::Reference < XLocator >      rDocumentLocator;
+
+
+    rtl::Reference < comphelper::AttributeList > rAttrList;
+
+    // External entity stack
+    std::vector<struct Entity>   vecEntity;
+    void pushEntity( Entity &&entity )
+        { vecEntity.push_back( std::move(entity) ); }
+    void popEntity()
+        { vecEntity.pop_back( ); }
+    struct Entity &getEntity()
+        { return vecEntity.back(); }
+
+
+    // Exception cannot be thrown through the C-XmlParser (possible resource leaks),
+    // therefore the exception must be saved somewhere.
+    SAXParseException   exception;
+    css::uno::RuntimeException    rtexception;
+    bool                bExceptionWasThrown;
+    bool                bRTExceptionWasThrown;
+
+public:
+    SaxExpatParser_Impl()
+        : m_bEnableDoS(false)
+        , bExceptionWasThrown(false)
+        , bRTExceptionWasThrown(false)
+    {
+    }
+
+    // the C-Callbacks for the expat parser
+    void static callbackStartElement(void *userData, const XML_Char *name , const XML_Char **atts);
+    void static callbackEndElement(void *userData, const XML_Char *name);
+    void static callbackCharacters( void *userData , const XML_Char *s , int nLen );
+    void static callbackProcessingInstruction(  void *userData ,
+                                                const XML_Char *sTarget ,
+                                                const XML_Char *sData );
+
+    void static callbackEntityDecl( void *userData ,
+                                    const XML_Char *entityName,
+                                    int is_parameter_entity,
+                                    const XML_Char *value,
+                                    int value_length,
+                                    const XML_Char *base,
+                                    const XML_Char *systemId,
+                                    const XML_Char *publicId,
+                                    const XML_Char *notationName);
+
+    void static callbackNotationDecl(   void *userData,
+                                        const XML_Char *notationName,
+                                        const XML_Char *base,
+                                        const XML_Char *systemId,
+                                        const XML_Char *publicId);
+
+    bool static callbackExternalEntityRef(   XML_Parser parser,
+                                            const XML_Char *openEntityNames,
+                                            const XML_Char *base,
+                                            const XML_Char *systemId,
+                                            const XML_Char *publicId);
+
+    int static callbackUnknownEncoding(void *encodingHandlerData,
+                                                  const XML_Char *name,
+                                                  XML_Encoding *info);
+
+    void static callbackDefault( void *userData,  const XML_Char *s,  int len);
+
+    void static callbackStartCDATA( void *userData );
+    void static callbackEndCDATA( void *userData );
+    void static callbackComment( void *userData , const XML_Char *s );
+    void static callErrorHandler( SaxExpatParser_Impl *pImpl , const SAXParseException &e );
+
+public:
+    void parse();
+};
+
+extern "C"
+{
+    static void call_callbackStartElement(void *userData, const XML_Char *name , const XML_Char **atts)
+    {
+        SaxExpatParser_Impl::callbackStartElement(userData,name,atts);
+    }
+    static void call_callbackEndElement(void *userData, const XML_Char *name)
+    {
+        SaxExpatParser_Impl::callbackEndElement(userData,name);
+    }
+    static void call_callbackCharacters( void *userData , const XML_Char *s , int nLen )
+    {
+        SaxExpatParser_Impl::callbackCharacters(userData,s,nLen);
+    }
+    static void call_callbackProcessingInstruction(void *userData,const XML_Char *sTarget,const XML_Char *sData )
+    {
+        SaxExpatParser_Impl::callbackProcessingInstruction(userData,sTarget,sData );
+    }
+    static void call_callbackEntityDecl(void *userData ,
+                                        const XML_Char *entityName,
+                                        int is_parameter_entity,
+                                        const XML_Char *value,
+                                        int value_length,
+                                        const XML_Char *base,
+                                        const XML_Char *systemId,
+                                        const XML_Char *publicId,
+                                        const XML_Char *notationName)
+    {
+        SaxExpatParser_Impl::callbackEntityDecl(userData, entityName,
+                is_parameter_entity, value, value_length,
+                base, systemId, publicId, notationName);
+    }
+    static void call_callbackNotationDecl(void *userData,
+                                          const XML_Char *notationName,
+                                          const XML_Char *base,
+                                          const XML_Char *systemId,
+                                          const XML_Char *publicId)
+    {
+        SaxExpatParser_Impl::callbackNotationDecl(userData,notationName,base,systemId,publicId);
+    }
+    static int call_callbackExternalEntityRef(XML_Parser parser,
+                                              const XML_Char *openEntityNames,
+                                              const XML_Char *base,
+                                              const XML_Char *systemId,
+                                              const XML_Char *publicId)
+    {
+        return SaxExpatParser_Impl::callbackExternalEntityRef(parser,openEntityNames,base,systemId,publicId);
+    }
+    static int call_callbackUnknownEncoding(void *encodingHandlerData,
+                                              const XML_Char *name,
+                                            XML_Encoding *info)
+    {
+        return SaxExpatParser_Impl::callbackUnknownEncoding(encodingHandlerData,name,info);
+    }
+    static void call_callbackDefault( void *userData,  const XML_Char *s,  int len)
+    {
+        SaxExpatParser_Impl::callbackDefault(userData,s,len);
+    }
+    static void call_callbackStartCDATA( void *userData )
+    {
+        SaxExpatParser_Impl::callbackStartCDATA(userData);
+    }
+    static void call_callbackEndCDATA( void *userData )
+    {
+        SaxExpatParser_Impl::callbackEndCDATA(userData);
+    }
+    static void call_callbackComment( void *userData , const XML_Char *s )
+    {
+        SaxExpatParser_Impl::callbackComment(userData,s);
+    }
+}
+
+
+// LocatorImpl
+
+class LocatorImpl :
+    public WeakImplHelper< XLocator, css::io::XSeekable >
+    // should use a different interface for stream positions!
+{
+public:
+    explicit LocatorImpl(SaxExpatParser_Impl *p)
+        : m_pParser(p)
+    {
+    }
+
+public: //XLocator
+    virtual sal_Int32 SAL_CALL getColumnNumber() override
+    {
+        return XML_GetCurrentColumnNumber( m_pParser->getEntity().pParser );
+    }
+    virtual sal_Int32 SAL_CALL getLineNumber() override
+    {
+        return XML_GetCurrentLineNumber( m_pParser->getEntity().pParser );
+    }
+    virtual OUString SAL_CALL getPublicId() override
+    {
+        return m_pParser->getEntity().structSource.sPublicId;
+    }
+    virtual OUString SAL_CALL getSystemId() override
+    {
+        return m_pParser->getEntity().structSource.sSystemId;
+    }
+
+    // XSeekable (only for getPosition)
+
+    virtual void SAL_CALL seek( sal_Int64 ) override
+    {
+    }
+    virtual sal_Int64 SAL_CALL getPosition() override
+    {
+        return XML_GetCurrentByteIndex( m_pParser->getEntity().pParser );
+    }
+    virtual ::sal_Int64 SAL_CALL getLength() override
+    {
+        return 0;
+    }
+
+private:
+
+    SaxExpatParser_Impl *m_pParser;
+};
+
+
+SaxExpatParser::SaxExpatParser(  )
+{
+    m_pImpl.reset( new SaxExpatParser_Impl );
+
+    rtl::Reference<LocatorImpl> pLoc = new LocatorImpl( m_pImpl.get() );
+    m_pImpl->rDocumentLocator = pLoc;
+
+    // Performance-improvement; handing out the same object with every call of
+    // the startElement callback is allowed (see sax-specification):
+    m_pImpl->rAttrList = new comphelper::AttributeList;
+
+    m_pImpl->bExceptionWasThrown = false;
+    m_pImpl->bRTExceptionWasThrown = false;
+}
+
+// css::lang::XInitialization:
+void SAL_CALL
+SaxExpatParser::initialize(css::uno::Sequence< css::uno::Any > const& rArguments)
+{
+    // possible arguments: a string "DoSmeplease"
+    if (rArguments.hasElements())
+    {
+        OUString str;
+        if ((rArguments[0] >>= str) && "DoSmeplease" == str)
+        {
+            std::unique_lock guard( m_pImpl->aMutex );
+            m_pImpl->m_bEnableDoS = true;
+        }
+    }
+}
+
+class ParserCleanup
+{
+private:
+    SaxExpatParser_Impl& m_rParser;
+    XML_Parser m_xmlParser;
+public:
+    ParserCleanup(SaxExpatParser_Impl& rParser, XML_Parser xmlParser)
+        : m_rParser(rParser)
+        , m_xmlParser(xmlParser)
+    {
+    }
+    ~ParserCleanup()
+    {
+        m_rParser.popEntity();
+        //XML_ParserFree accepts a null arg
+        XML_ParserFree(m_xmlParser);
+    }
+};
+
+/***************
+*
+* parseStream does Parser-startup initializations. The SaxExpatParser_Impl::parse() method does
+* the file-specific initialization work. (During a parser run, external files may be opened)
+*
+****************/
+void SaxExpatParser::parseStream(   const InputSource& structSource)
+{
+    // Only one text at one time
+    std::unique_lock guard( m_pImpl->aMutex );
+
+
+    struct Entity entity;
+    entity.structSource = structSource;
+
+    if( ! entity.structSource.aInputStream.is() )
+    {
+        throw SAXException("No input source",
+                            css::uno::Reference< css::uno::XInterface > () , css::uno::Any() );
+    }
+
+    entity.converter.setInputStream( entity.structSource.aInputStream );
+    if( !entity.structSource.sEncoding.isEmpty() )
+    {
+        entity.converter.setEncoding(
+            OUStringToOString( entity.structSource.sEncoding , RTL_TEXTENCODING_ASCII_US ) );
+    }
+
+    // create parser with proper encoding
+    entity.pParser = XML_ParserCreate( nullptr );
+    if( ! entity.pParser )
+    {
+        throw SAXException("Couldn't create parser",
+                            css::uno::Reference< css::uno::XInterface > (), css::uno::Any() );
+    }
+
+    // set all necessary C-Callbacks
+    XML_SetUserData( entity.pParser, m_pImpl.get() );
+    XML_SetElementHandler(  entity.pParser ,
+                            call_callbackStartElement ,
+                            call_callbackEndElement );
+    XML_SetCharacterDataHandler( entity.pParser , call_callbackCharacters );
+    XML_SetProcessingInstructionHandler(entity.pParser ,
+                                        call_callbackProcessingInstruction );
+    if (!m_pImpl->m_bEnableDoS)
+    {
+        XML_SetEntityDeclHandler(entity.pParser, call_callbackEntityDecl);
+    }
+    XML_SetNotationDeclHandler( entity.pParser, call_callbackNotationDecl );
+    XML_SetExternalEntityRefHandler(    entity.pParser,
+                                        call_callbackExternalEntityRef);
+    XML_SetUnknownEncodingHandler( entity.pParser,  call_callbackUnknownEncoding ,nullptr);
+
+    if( m_pImpl->rExtendedDocumentHandler.is() ) {
+
+        // These handlers just delegate calls to the ExtendedHandler. If no extended handler is
+        // given, these callbacks can be ignored
+        XML_SetDefaultHandlerExpand( entity.pParser, call_callbackDefault );
+        XML_SetCommentHandler( entity.pParser, call_callbackComment );
+        XML_SetCdataSectionHandler(     entity.pParser ,
+                                        call_callbackStartCDATA ,
+                                         call_callbackEndCDATA );
+    }
+
+
+    m_pImpl->exception = SAXParseException();
+    auto const xmlParser = entity.pParser;
+    m_pImpl->pushEntity( std::move(entity) );
+
+    ParserCleanup aEnsureFree(*m_pImpl, xmlParser);
+
+    // start the document
+    if( m_pImpl->rDocumentHandler.is() ) {
+        m_pImpl->rDocumentHandler->setDocumentLocator( m_pImpl->rDocumentLocator );
+        m_pImpl->rDocumentHandler->startDocument();
+    }
+
+    m_pImpl->parse();
+
+    // finish document
+    if( m_pImpl->rDocumentHandler.is() ) {
+        m_pImpl->rDocumentHandler->endDocument();
+    }
+}
+
+void SaxExpatParser::setDocumentHandler(const css::uno::Reference< XDocumentHandler > & xHandler)
+{
+    m_pImpl->rDocumentHandler = xHandler;
+    m_pImpl->rExtendedDocumentHandler =
+        css::uno::Reference< XExtendedDocumentHandler >( xHandler , css::uno::UNO_QUERY );
+}
+
+void SaxExpatParser::setErrorHandler(const css::uno::Reference< XErrorHandler > & xHandler)
+{
+    m_pImpl->rErrorHandler = xHandler;
+}
+
+void SaxExpatParser::setDTDHandler(const css::uno::Reference< XDTDHandler > & xHandler)
+{
+    m_pImpl->rDTDHandler = xHandler;
+}
+
+void SaxExpatParser::setEntityResolver(const css::uno::Reference < XEntityResolver > & xResolver)
+{
+    m_pImpl->rEntityResolver = xResolver;
+}
+
+
+void SaxExpatParser::setLocale( const Locale & )
+{
+    // not implemented
+}
+
+// XServiceInfo
+OUString SaxExpatParser::getImplementationName()
+{
+    return "com.sun.star.comp.extensions.xml.sax.ParserExpat";
+}
+
+// XServiceInfo
+sal_Bool SaxExpatParser::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+css::uno::Sequence< OUString > SaxExpatParser::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.sax.Parser" };
+}
+
+
+/*---------------------------------------
+*
+* Helper functions and classes
+*
+*
+*-------------------------------------------*/
+OUString getErrorMessage( XML_Error xmlE, std::u16string_view sSystemId , sal_Int32 nLine )
+{
+    OUString Message;
+    if( XML_ERROR_NONE == xmlE ) {
+        Message = "No";
+    }
+    else if( XML_ERROR_NO_MEMORY == xmlE ) {
+        Message = "no memory";
+    }
+    else if( XML_ERROR_SYNTAX == xmlE ) {
+        Message = "syntax";
+    }
+    else if( XML_ERROR_NO_ELEMENTS == xmlE ) {
+        Message = "no elements";
+    }
+    else if( XML_ERROR_INVALID_TOKEN == xmlE ) {
+        Message = "invalid token";
+    }
+    else if( XML_ERROR_UNCLOSED_TOKEN == xmlE ) {
+        Message = "unclosed token";
+    }
+    else if( XML_ERROR_PARTIAL_CHAR == xmlE ) {
+        Message = "partial char";
+    }
+    else if( XML_ERROR_TAG_MISMATCH == xmlE ) {
+        Message = "tag mismatch";
+    }
+    else if( XML_ERROR_DUPLICATE_ATTRIBUTE == xmlE ) {
+        Message = "duplicate attribute";
+    }
+    else if( XML_ERROR_JUNK_AFTER_DOC_ELEMENT == xmlE ) {
+        Message = "junk after doc element";
+    }
+    else if( XML_ERROR_PARAM_ENTITY_REF == xmlE ) {
+        Message = "parameter entity reference";
+    }
+    else if( XML_ERROR_UNDEFINED_ENTITY == xmlE ) {
+        Message = "undefined entity";
+    }
+    else if( XML_ERROR_RECURSIVE_ENTITY_REF == xmlE ) {
+        Message = "recursive entity reference";
+    }
+    else if( XML_ERROR_ASYNC_ENTITY == xmlE ) {
+        Message = "async entity";
+    }
+    else if( XML_ERROR_BAD_CHAR_REF == xmlE ) {
+        Message = "bad char reference";
+    }
+    else if( XML_ERROR_BINARY_ENTITY_REF == xmlE ) {
+        Message = "binary entity reference";
+    }
+    else if( XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF == xmlE ) {
+        Message = "attribute external entity reference";
+    }
+    else if( XML_ERROR_MISPLACED_XML_PI == xmlE ) {
+        Message = "misplaced xml processing instruction";
+    }
+    else if( XML_ERROR_UNKNOWN_ENCODING == xmlE ) {
+        Message = "unknown encoding";
+    }
+    else if( XML_ERROR_INCORRECT_ENCODING == xmlE ) {
+        Message = "incorrect encoding";
+    }
+    else if( XML_ERROR_UNCLOSED_CDATA_SECTION == xmlE ) {
+        Message = "unclosed cdata section";
+    }
+    else if( XML_ERROR_EXTERNAL_ENTITY_HANDLING == xmlE ) {
+        Message = "external entity reference";
+    }
+    else if( XML_ERROR_NOT_STANDALONE == xmlE ) {
+        Message = "not standalone";
+    }
+
+    OUString str = OUString::Concat("[") +
+        sSystemId +
+        " line " +
+        OUString::number( nLine ) +
+        "]: " +
+        Message +
+        "error";
+
+    return str;
+}
+
+
+// starts parsing with actual parser !
+void SaxExpatParser_Impl::parse( )
+{
+    const int nBufSize = 16*1024;
+
+    int nRead   = nBufSize;
+    css::uno::Sequence< sal_Int8 > seqOut(nBufSize);
+
+    while( nRead ) {
+        nRead = getEntity().converter.readAndConvert( seqOut , nBufSize );
+
+        bool bContinue(false);
+
+        if( ! nRead ) {
+            // last call - must return OK
+            XML_Status const ret = XML_Parse( getEntity().pParser,
+                                   reinterpret_cast<const char *>(seqOut.getConstArray()),
+                                   0 ,
+                                   1 );
+            if (ret == XML_STATUS_OK) {
+                break;
+            }
+        } else {
+            bContinue = ( XML_Parse( getEntity().pParser,
+                                                reinterpret_cast<const char *>(seqOut.getConstArray()),
+                                                nRead,
+                                                0 ) != XML_STATUS_ERROR );
+        }
+
+        if( ! bContinue || bExceptionWasThrown ) {
+
+            if ( bRTExceptionWasThrown )
+                throw rtexception;
+
+            // Error during parsing !
+            XML_Error xmlE = XML_GetErrorCode( getEntity().pParser );
+            OUString sSystemId = rDocumentLocator->getSystemId();
+            sal_Int32 nLine = rDocumentLocator->getLineNumber();
+
+            SAXParseException aExcept(
+                getErrorMessage(xmlE , sSystemId, nLine) ,
+                css::uno::Reference< css::uno::XInterface >(),
+                css::uno::Any( &exception , cppu::UnoType<decltype(exception)>::get() ),
+                rDocumentLocator->getPublicId(),
+                rDocumentLocator->getSystemId(),
+                rDocumentLocator->getLineNumber(),
+                rDocumentLocator->getColumnNumber()
+                );
+
+            if( rErrorHandler.is() ) {
+
+                // error handler is set, so the handler may throw the exception
+                css::uno::Any a;
+                a <<= aExcept;
+                rErrorHandler->fatalError( a );
+            }
+
+            // Error handler has not thrown an exception, but parsing cannot go on,
+            // so an exception MUST be thrown.
+            throw aExcept;
+        } // if( ! bContinue )
+    } // while
+}
+
+
+// The C-Callbacks
+
+
+void SaxExpatParser_Impl::callbackStartElement( void *pvThis ,
+                                                const XML_Char *pwName ,
+                                                const XML_Char **awAttributes )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    if( !pImpl->rDocumentHandler.is() )
+        return;
+
+    int i = 0;
+    pImpl->rAttrList->Clear();
+
+    while( awAttributes[i] ) {
+        assert(awAttributes[i+1]);
+        pImpl->rAttrList->AddAttribute(
+            XML_CHAR_TO_OUSTRING( awAttributes[i] ) ,
+            XML_CHAR_TO_OUSTRING( awAttributes[i+1] ) );
+        i +=2;
+    }
+
+    CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(
+        pImpl ,
+        rDocumentHandler->startElement( XML_CHAR_TO_OUSTRING( pwName ) ,
+                                        pImpl->rAttrList ) );
+}
+
+void SaxExpatParser_Impl::callbackEndElement( void *pvThis , const XML_Char *pwName  )
+{
+    SaxExpatParser_Impl  *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    if( pImpl->rDocumentHandler.is() ) {
+        CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS( pImpl,
+                rDocumentHandler->endElement( XML_CHAR_TO_OUSTRING( pwName ) ) );
+    }
+}
+
+
+void SaxExpatParser_Impl::callbackCharacters( void *pvThis , const XML_Char *s , int nLen )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    if( pImpl->rDocumentHandler.is() ) {
+        CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS( pImpl ,
+                rDocumentHandler->characters( XML_CHAR_N_TO_USTRING(s,nLen) ) );
+    }
+}
+
+void SaxExpatParser_Impl::callbackProcessingInstruction(    void *pvThis,
+                                                    const XML_Char *sTarget ,
+                                                    const XML_Char *sData )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+    if( pImpl->rDocumentHandler.is() ) {
+        CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(
+                    pImpl ,
+                    rDocumentHandler->processingInstruction( XML_CHAR_TO_OUSTRING( sTarget ),
+                    XML_CHAR_TO_OUSTRING( sData ) ) );
+    }
+}
+
+
+void SaxExpatParser_Impl::callbackEntityDecl(
+    void *pvThis, const XML_Char *entityName,
+    SAL_UNUSED_PARAMETER int /*is_parameter_entity*/,
+    const XML_Char *value, SAL_UNUSED_PARAMETER int /*value_length*/,
+    SAL_UNUSED_PARAMETER const XML_Char * /*base*/, const XML_Char *systemId,
+    const XML_Char *publicId, const XML_Char *notationName)
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+    if (value) { // value != 0 means internal entity
+        SAL_INFO("sax","SaxExpatParser: internal entity declaration, stopping");
+        XML_StopParser(pImpl->getEntity().pParser, XML_FALSE);
+        pImpl->exception = SAXParseException(
+            "SaxExpatParser: internal entity declaration, stopping",
+            nullptr, css::uno::Any(),
+            pImpl->rDocumentLocator->getPublicId(),
+            pImpl->rDocumentLocator->getSystemId(),
+            pImpl->rDocumentLocator->getLineNumber(),
+            pImpl->rDocumentLocator->getColumnNumber() );
+        pImpl->bExceptionWasThrown = true;
+    } else {
+        if( pImpl->rDTDHandler.is() ) {
+            CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(
+                pImpl ,
+                rDTDHandler->unparsedEntityDecl(
+                    XML_CHAR_TO_OUSTRING( entityName ),
+                    XML_CHAR_TO_OUSTRING( publicId ) ,
+                    XML_CHAR_TO_OUSTRING( systemId ) ,
+                    XML_CHAR_TO_OUSTRING( notationName ) ) );
+        }
+    }
+}
+
+void SaxExpatParser_Impl::callbackNotationDecl(
+    void *pvThis, const XML_Char *notationName,
+    SAL_UNUSED_PARAMETER const XML_Char * /*base*/, const XML_Char *systemId,
+    const XML_Char *publicId)
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+    if( pImpl->rDTDHandler.is() ) {
+        CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS( pImpl,
+                rDTDHandler->notationDecl(  XML_CHAR_TO_OUSTRING( notationName ) ,
+                                            XML_CHAR_TO_OUSTRING( publicId ) ,
+                                            XML_CHAR_TO_OUSTRING( systemId ) ) );
+    }
+
+}
+
+
+bool SaxExpatParser_Impl::callbackExternalEntityRef(
+    XML_Parser parser, const XML_Char *context,
+    SAL_UNUSED_PARAMETER const XML_Char * /*base*/, const XML_Char *systemId,
+    const XML_Char *publicId)
+{
+    bool bOK = true;
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(XML_GetUserData( parser ));
+
+    struct Entity entity;
+
+    if( pImpl->rEntityResolver.is() ) {
+        try
+        {
+            entity.structSource = pImpl->rEntityResolver->resolveEntity(
+                XML_CHAR_TO_OUSTRING( publicId ) ,
+                XML_CHAR_TO_OUSTRING( systemId ) );
+        }
+        catch( const SAXParseException & e )
+        {
+            pImpl->exception = e;
+            bOK = false;
+        }
+        catch( const SAXException & e )
+        {
+            pImpl->exception = SAXParseException(
+                e.Message , e.Context , e.WrappedException ,
+                pImpl->rDocumentLocator->getPublicId(),
+                pImpl->rDocumentLocator->getSystemId(),
+                pImpl->rDocumentLocator->getLineNumber(),
+                pImpl->rDocumentLocator->getColumnNumber() );
+            bOK = false;
+        }
+    }
+
+    if( entity.structSource.aInputStream.is() ) {
+        entity.pParser = XML_ExternalEntityParserCreate( parser , context, nullptr );
+        if( ! entity.pParser )
+        {
+            return false;
+        }
+
+        entity.converter.setInputStream( entity.structSource.aInputStream );
+        auto const xmlParser = entity.pParser;
+        pImpl->pushEntity( std::move(entity) );
+        try
+        {
+            pImpl->parse();
+        }
+        catch( const SAXParseException & e )
+        {
+            pImpl->exception = e;
+            bOK = false;
+        }
+        catch( const IOException &e )
+        {
+            pImpl->exception.WrappedException <<= e;
+            bOK = false;
+        }
+        catch( const css::uno::RuntimeException &e )
+        {
+            pImpl->exception.WrappedException <<=e;
+            bOK = false;
+        }
+
+        pImpl->popEntity();
+
+        XML_ParserFree( xmlParser );
+    }
+
+    return bOK;
+}
+
+int SaxExpatParser_Impl::callbackUnknownEncoding(
+    SAL_UNUSED_PARAMETER void * /*encodingHandlerData*/,
+    SAL_UNUSED_PARAMETER const XML_Char * /*name*/,
+    SAL_UNUSED_PARAMETER XML_Encoding * /*info*/)
+{
+    return 0;
+}
+
+void SaxExpatParser_Impl::callbackDefault( void *pvThis,  const XML_Char *s,  int len)
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(  pImpl,
+                rExtendedDocumentHandler->unknown( XML_CHAR_N_TO_USTRING( s ,len) ) );
+}
+
+void SaxExpatParser_Impl::callbackComment( void *pvThis , const XML_Char *s )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+    CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS( pImpl,
+                rExtendedDocumentHandler->comment( XML_CHAR_TO_OUSTRING( s ) ) );
+}
+
+void SaxExpatParser_Impl::callbackStartCDATA( void *pvThis )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS( pImpl, rExtendedDocumentHandler->startCDATA() );
+}
+
+
+void SaxExpatParser_Impl::callErrorHandler( SaxExpatParser_Impl *pImpl ,
+                                            const SAXParseException & e )
+{
+    try
+    {
+        if( pImpl->rErrorHandler.is() ) {
+            css::uno::Any a;
+            a <<= e;
+            pImpl->rErrorHandler->error( a );
+        }
+        else {
+            pImpl->exception = e;
+            pImpl->bExceptionWasThrown = true;
+        }
+    }
+    catch( const SAXParseException & ex ) {
+        pImpl->exception = ex;
+        pImpl->bExceptionWasThrown = true;
+    }
+    catch( const SAXException & ex ) {
+        pImpl->exception = SAXParseException(
+                                    ex.Message,
+                                    ex.Context,
+                                    ex.WrappedException,
+                                    pImpl->rDocumentLocator->getPublicId(),
+                                    pImpl->rDocumentLocator->getSystemId(),
+                                    pImpl->rDocumentLocator->getLineNumber(),
+                                    pImpl->rDocumentLocator->getColumnNumber()
+                             );
+        pImpl->bExceptionWasThrown = true;
+    }
+}
+
+void SaxExpatParser_Impl::callbackEndCDATA( void *pvThis )
+{
+    SaxExpatParser_Impl *pImpl = static_cast<SaxExpatParser_Impl*>(pvThis);
+
+    CALL_ELEMENT_HANDLER_AND_CARE_FOR_EXCEPTIONS(pImpl,rExtendedDocumentHandler->endCDATA() );
+}
+
+} // namespace
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_extensions_xml_sax_ParserExpat_get_implementation(
+    css::uno::XComponentContext *,
+    css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new SaxExpatParser);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/expatwrap/saxwriter.cxx b/sax/source/expatwrap/saxwriter.cxx
new file mode 100644
index 0000000000..55608101fa
--- /dev/null
+++ b/sax/source/expatwrap/saxwriter.cxx
@@ -0,0 +1,1464 @@
+/* -*- 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 <string.h>
+
+#include <cassert>
+#include <set>
+#include <stack>
+#include <vector>
+
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/util/XCloneable.hpp>
+#include <com/sun/star/xml/sax/SAXInvalidCharacterException.hpp>
+#include <com/sun/star/xml/sax/XWriter.hpp>
+
+#include <cppuhelper/exc_hlp.hxx>
+#include <cppuhelper/weak.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <osl/diagnose.h>
+#include <rtl/character.hxx>
+#include <sal/log.hxx>
+
+#include <memory>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::xml::sax;
+using namespace ::com::sun::star::util;
+using namespace ::com::sun::star::io;
+
+#define LINEFEED 10
+#define SEQUENCESIZE 1024
+#define MAXCOLUMNCOUNT 72
+
+/******
+*
+*
+* Character conversion functions
+*
+*
+*****/
+
+namespace
+{
+enum SaxInvalidCharacterError
+{
+    SAX_NONE,
+    SAX_WARNING,
+    SAX_ERROR
+};
+
+// Stuff for custom entity names
+struct ReplacementPair
+{
+    OUString name;
+    OUString replacement;
+};
+inline bool operator<(const ReplacementPair& lhs, const ReplacementPair& rhs)
+{
+    return lhs.replacement.compareTo(rhs.replacement) < 0;
+}
+
+class SaxWriterHelper
+{
+#ifdef DBG_UTIL
+public:
+    ::std::stack<OUString> m_DebugStartedElements;
+#endif
+
+private:
+    Reference<XOutputStream> m_out;
+    Sequence<sal_Int8> m_Sequence;
+    sal_Int8* mp_Sequence;
+
+    sal_Int32 nLastLineFeedPos; // is negative after writing a sequence
+    sal_uInt32 nCurrentPos;
+    bool m_bStartElementFinished;
+
+    std::vector<ReplacementPair> m_Replacements;
+
+    /// @throws SAXException
+    sal_uInt32 writeSequence();
+
+    // use only if to insert the bytes more space in the sequence is needed and
+    // so the sequence has to write out and reset rPos to 0
+    // writes sequence only on overflow, sequence could be full on the end (rPos == SEQUENCESIZE)
+    /// @throws SAXException
+    void AddBytes(sal_Int8* pTarget, sal_uInt32& rPos, const sal_Int8* pBytes,
+                  sal_uInt32 nBytesCount);
+    /// @throws SAXException
+    bool convertToXML(const sal_Unicode* pStr, sal_Int32 nStrLen, bool bDoNormalization,
+                      bool bNormalizeWhitespace, sal_Int8* pTarget, sal_uInt32& rPos);
+    /// @throws SAXException
+    void FinishStartElement();
+
+    // Search for the correct replacement
+    const ReplacementPair* findXMLReplacement(const sal_Unicode* pStr, sal_Int32 nStrLen);
+
+public:
+    explicit SaxWriterHelper(Reference<XOutputStream> const& m_TempOut)
+        : m_out(m_TempOut)
+        , m_Sequence(SEQUENCESIZE)
+        , mp_Sequence(nullptr)
+        , nLastLineFeedPos(0)
+        , nCurrentPos(0)
+        , m_bStartElementFinished(true)
+    {
+        OSL_ENSURE(SEQUENCESIZE > 50, "Sequence cache size too small");
+        mp_Sequence = m_Sequence.getArray();
+    }
+    ~SaxWriterHelper()
+    {
+        OSL_ENSURE(!nCurrentPos, "cached Sequence not written");
+        OSL_ENSURE(m_bStartElementFinished, "StartElement not completely written");
+    }
+
+    /// @throws SAXException
+    void insertIndentation(sal_uInt32 m_nLevel);
+
+    // returns whether it works correct or invalid characters were in the string
+    // If there are invalid characters in the string it returns sal_False.
+    // Than the calling method has to throw the needed Exception.
+    /// @throws SAXException
+    bool writeString(const OUString& rWriteOutString, bool bDoNormalization,
+                     bool bNormalizeWhitespace);
+
+    sal_uInt32 GetLastColumnCount() const noexcept
+    {
+        return static_cast<sal_uInt32>(nCurrentPos - nLastLineFeedPos);
+    }
+
+    /// @throws SAXException
+    void startDocument();
+
+    // returns whether it works correct or invalid characters were in the strings
+    // If there are invalid characters in one of the strings it returns sal_False.
+    // Than the calling method has to throw the needed Exception.
+    /// @throws SAXException
+    SaxInvalidCharacterError startElement(const OUString& rName,
+                                          const Reference<XAttributeList>& xAttribs);
+    /// @throws SAXException
+    bool FinishEmptyElement();
+
+    // returns whether it works correct or invalid characters were in the string
+    // If there are invalid characters in the string it returns sal_False.
+    // Than the calling method has to throw the needed Exception.
+    /// @throws SAXException
+    bool endElement(const OUString& rName);
+    /// @throws SAXException
+    void endDocument();
+
+    // returns whether it works correct or invalid characters were in the strings
+    // If there are invalid characters in the string it returns sal_False.
+    // Than the calling method has to throw the needed Exception.
+    /// @throws SAXException
+    bool processingInstruction(const OUString& rTarget, const OUString& rData);
+    /// @throws SAXException
+    void startCDATA();
+    /// @throws SAXException
+    void endCDATA();
+
+    // returns whether it works correct or invalid characters were in the strings
+    // If there are invalid characters in the string it returns sal_False.
+    // Than the calling method has to throw the needed Exception.
+    /// @throws SAXException
+    bool comment(const OUString& rComment);
+
+    /// @throws SAXException
+    void clearBuffer();
+
+    // Use custom entity names
+    void setCustomEntityNames(
+        const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>&
+            replacements);
+
+    // Calculate length for convertToXML
+    sal_Int32 calcXMLByteLength(const OUString& rStr, bool bDoNormalization,
+                                bool bNormalizeWhitespace);
+};
+
+const bool g_bValidCharsBelow32[32] = {
+    // clang-format off
+//  0      1      2      3      4      5      6      7
+    false, false, false, false, false, false, false, false,  //0
+    false, true,  true,  false, false, true,  false, false,  //8
+    false, false, false, false, false, false, false, false,  //16
+    false, false, false, false, false, false, false, false
+    // clang-format on
+};
+
+bool IsInvalidChar(const sal_Unicode aChar)
+{
+    bool bRet(false);
+    // check first for the most common characters
+    if (aChar < 32 || aChar >= 0xd800)
+        bRet = ((aChar < 32 && !g_bValidCharsBelow32[aChar]) || aChar == 0xffff || aChar == 0xfffe);
+    return bRet;
+}
+
+/********
+* write through to the output stream
+*
+*****/
+sal_uInt32 SaxWriterHelper::writeSequence()
+{
+    try
+    {
+        m_out->writeBytes(m_Sequence);
+    }
+    catch (const IOException&)
+    {
+        css::uno::Any anyEx = cppu::getCaughtException();
+        throw SAXException("IO exception during writing", Reference<XInterface>(), anyEx);
+    }
+    nLastLineFeedPos -= SEQUENCESIZE;
+    return 0;
+}
+
+void SaxWriterHelper::AddBytes(sal_Int8* pTarget, sal_uInt32& rPos, const sal_Int8* pBytes,
+                               sal_uInt32 nBytesCount)
+{
+    OSL_ENSURE((rPos + nBytesCount) > SEQUENCESIZE, "wrong use of AddBytesMethod");
+    sal_uInt32 nCount(SEQUENCESIZE - rPos);
+    memcpy(&(pTarget[rPos]), pBytes, nCount);
+
+    OSL_ENSURE(rPos + nCount == SEQUENCESIZE, "the position should be the at the end");
+
+    rPos = writeSequence();
+    sal_uInt32 nRestCount(nBytesCount - nCount);
+    if ((rPos + nRestCount) <= SEQUENCESIZE)
+    {
+        memcpy(&(pTarget[rPos]), &pBytes[nCount], nRestCount);
+        rPos += nRestCount;
+    }
+    else
+        AddBytes(pTarget, rPos, &pBytes[nCount], nRestCount);
+}
+
+void SaxWriterHelper::setCustomEntityNames(
+    const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>& replacements)
+{
+    m_Replacements.resize(replacements.size());
+    for (size_t i = 0; i < replacements.size(); ++i)
+    {
+        m_Replacements[i].name = replacements[i].First;
+        m_Replacements[i].replacement = replacements[i].Second;
+    }
+    if (replacements.size() > 1)
+        std::sort(m_Replacements.begin(), m_Replacements.end());
+}
+
+/** Converts a UTF-16 string to UTF-8 and does XML normalization
+
+    @param pTarget
+           Pointer to a piece of memory, to where the output should be written. The caller
+           must call calcXMLByteLength on the same string, to ensure,
+           that there is enough memory for converting.
+ */
+bool SaxWriterHelper::convertToXML(const sal_Unicode* pStr, sal_Int32 nStrLen,
+                                   bool bDoNormalization, bool bNormalizeWhitespace,
+                                   sal_Int8* pTarget, sal_uInt32& rPos)
+{
+    bool bRet(true);
+    sal_uInt32 nSurrogate = 0;
+
+    for (sal_Int32 i = 0; i < nStrLen; i++)
+    {
+        sal_Unicode c = pStr[i];
+        if (IsInvalidChar(c))
+            bRet = false;
+        else if ((c >= 0x0001) && (c <= 0x007F)) // Deal with ascii
+        {
+            if (bDoNormalization)
+            {
+                switch (c)
+                {
+                    case '&': // resemble to &amp;
+                    {
+                        if ((rPos + 5) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&amp;"), 5);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&amp;", 5);
+                            rPos += 5;
+                        }
+                    }
+                    break;
+                    case '<':
+                    {
+                        if ((rPos + 4) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&lt;"), 4);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&lt;", 4);
+                            rPos += 4; // &lt;
+                        }
+                    }
+                    break;
+                    case '>':
+                    {
+                        if ((rPos + 4) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&gt;"), 4);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&gt;", 4);
+                            rPos += 4; // &gt;
+                        }
+                    }
+                    break;
+                    case '\'':
+                    {
+                        if ((rPos + 6) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&apos;"), 6);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&apos;", 6);
+                            rPos += 6; // &apos;
+                        }
+                    }
+                    break;
+                    case '"':
+                    {
+                        if ((rPos + 6) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&quot;"), 6);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&quot;", 6);
+                            rPos += 6; // &quot;
+                        }
+                    }
+                    break;
+                    case 13:
+                    {
+                        if ((rPos + 6) > SEQUENCESIZE)
+                            AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&#x0d;"), 6);
+                        else
+                        {
+                            memcpy(&(pTarget[rPos]), "&#x0d;", 6);
+                            rPos += 6;
+                        }
+                    }
+                    break;
+                    case LINEFEED:
+                    {
+                        if (bNormalizeWhitespace)
+                        {
+                            if ((rPos + 6) > SEQUENCESIZE)
+                                AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&#x0a;"),
+                                         6);
+                            else
+                            {
+                                memcpy(&(pTarget[rPos]), "&#x0a;", 6);
+                                rPos += 6;
+                            }
+                        }
+                        else
+                        {
+                            pTarget[rPos] = LINEFEED;
+                            nLastLineFeedPos = rPos;
+                            rPos++;
+                        }
+                    }
+                    break;
+                    case 9:
+                    {
+                        if (bNormalizeWhitespace)
+                        {
+                            if ((rPos + 6) > SEQUENCESIZE)
+                                AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>("&#x09;"),
+                                         6);
+                            else
+                            {
+                                memcpy(&(pTarget[rPos]), "&#x09;", 6);
+                                rPos += 6;
+                            }
+                        }
+                        else
+                        {
+                            pTarget[rPos] = 9;
+                            rPos++;
+                        }
+                    }
+                    break;
+                    default:
+                    {
+                        pTarget[rPos] = static_cast<sal_Int8>(c);
+                        rPos++;
+                    }
+                    break;
+                }
+            }
+            else
+            {
+                pTarget[rPos] = static_cast<sal_Int8>(c);
+                if (static_cast<sal_Int8>(c) == LINEFEED)
+                    nLastLineFeedPos = rPos;
+                rPos++;
+            }
+        }
+        else
+        {
+            // Deal with replacements
+            if (bDoNormalization && !m_Replacements.empty())
+            {
+                // search
+                const ReplacementPair* it = findXMLReplacement(&pStr[i], nStrLen - i);
+
+                // replace
+                if (it != nullptr)
+                {
+                    OString name = ::rtl::OUStringToOString(it->name, RTL_TEXTENCODING_UTF8);
+                    if (rPos + name.getLength() > SEQUENCESIZE)
+                        AddBytes(pTarget, rPos, reinterpret_cast<sal_Int8 const*>(name.getStr()),
+                                 name.getLength());
+                    else
+                    {
+                        memcpy(&(pTarget[rPos]), name.getStr(), name.getLength());
+                        rPos += name.getLength();
+                    }
+                    i += it->replacement.getLength() - 1;
+                    continue;
+                }
+            }
+
+            // Deal with other unicode cases
+            if (rtl::isHighSurrogate(c))
+            {
+                // 1. surrogate: save (until 2. surrogate)
+                if (nSurrogate != 0) // left-over lone 1st Unicode surrogate
+                {
+                    OSL_FAIL("left-over Unicode surrogate");
+                    bRet = false;
+                }
+                nSurrogate = c;
+            }
+            else if (rtl::isLowSurrogate(c))
+            {
+                // 2. surrogate: write as UTF-8
+                if (nSurrogate) // can only be 1st surrogate
+                {
+                    nSurrogate = rtl::combineSurrogates(nSurrogate, c);
+                    sal_Int8 aBytes[] = { sal_Int8(0xF0 | ((nSurrogate >> 18) & 0x0F)),
+                                          sal_Int8(0x80 | ((nSurrogate >> 12) & 0x3F)),
+                                          sal_Int8(0x80 | ((nSurrogate >> 6) & 0x3F)),
+                                          sal_Int8(0x80 | ((nSurrogate >> 0) & 0x3F)) };
+                    if ((rPos + 4) > SEQUENCESIZE)
+                        AddBytes(pTarget, rPos, aBytes, 4);
+                    else
+                    {
+                        pTarget[rPos] = aBytes[0];
+                        rPos++;
+                        pTarget[rPos] = aBytes[1];
+                        rPos++;
+                        pTarget[rPos] = aBytes[2];
+                        rPos++;
+                        pTarget[rPos] = aBytes[3];
+                        rPos++;
+                    }
+                }
+                else // lone 2nd surrogate
+                {
+                    OSL_FAIL("illegal Unicode character");
+                    bRet = false;
+                }
+
+                // reset surrogate
+                nSurrogate = 0;
+            }
+            else if (c > 0x07FF)
+            {
+                sal_Int8 aBytes[]
+                    = { sal_Int8(0xE0 | ((c >> 12) & 0x0F)), sal_Int8(0x80 | ((c >> 6) & 0x3F)),
+                        sal_Int8(0x80 | ((c >> 0) & 0x3F)) };
+                if ((rPos + 3) > SEQUENCESIZE)
+                    AddBytes(pTarget, rPos, aBytes, 3);
+                else
+                {
+                    pTarget[rPos] = aBytes[0];
+                    rPos++;
+                    pTarget[rPos] = aBytes[1];
+                    rPos++;
+                    pTarget[rPos] = aBytes[2];
+                    rPos++;
+                }
+            }
+            else
+            {
+                sal_Int8 aBytes[]
+                    = { sal_Int8(0xC0 | ((c >> 6) & 0x1F)), sal_Int8(0x80 | ((c >> 0) & 0x3F)) };
+                if ((rPos + 2) > SEQUENCESIZE)
+                    AddBytes(pTarget, rPos, aBytes, 2);
+                else
+                {
+                    pTarget[rPos] = aBytes[0];
+                    rPos++;
+                    pTarget[rPos] = aBytes[1];
+                    rPos++;
+                }
+            }
+        }
+
+        OSL_ENSURE(rPos <= SEQUENCESIZE, "not reset current position");
+        if (rPos == SEQUENCESIZE)
+            rPos = writeSequence();
+
+        // reset left-over surrogate
+        if ((nSurrogate != 0) && !rtl::isHighSurrogate(c))
+        {
+            OSL_FAIL("left-over Unicode surrogate");
+            nSurrogate = 0;
+            bRet = false;
+        }
+    }
+    if (nSurrogate != 0) // trailing lone 1st surrogate
+    {
+        OSL_FAIL("left-over Unicode surrogate");
+        bRet = false;
+    }
+    return bRet;
+}
+
+void SaxWriterHelper::FinishStartElement()
+{
+    if (!m_bStartElementFinished)
+    {
+        mp_Sequence[nCurrentPos] = '>';
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+        m_bStartElementFinished = true;
+    }
+}
+
+void SaxWriterHelper::insertIndentation(sal_uInt32 m_nLevel)
+{
+    FinishStartElement();
+    if (m_nLevel > 0)
+    {
+        if ((nCurrentPos + m_nLevel + 1) <= SEQUENCESIZE)
+        {
+            mp_Sequence[nCurrentPos] = LINEFEED;
+            nLastLineFeedPos = nCurrentPos;
+            nCurrentPos++;
+            memset(&(mp_Sequence[nCurrentPos]), 32, m_nLevel);
+            nCurrentPos += m_nLevel;
+            if (nCurrentPos == SEQUENCESIZE)
+                nCurrentPos = writeSequence();
+        }
+        else
+        {
+            sal_uInt32 nCount(m_nLevel + 1);
+            std::unique_ptr<sal_Int8[]> pBytes(new sal_Int8[nCount]);
+            pBytes[0] = LINEFEED;
+            memset(&(pBytes[1]), 32, m_nLevel);
+            AddBytes(mp_Sequence, nCurrentPos, pBytes.get(), nCount);
+            pBytes.reset();
+            nLastLineFeedPos = nCurrentPos - nCount;
+            if (nCurrentPos == SEQUENCESIZE)
+                nCurrentPos = writeSequence();
+        }
+    }
+    else
+    {
+        mp_Sequence[nCurrentPos] = LINEFEED;
+        nLastLineFeedPos = nCurrentPos;
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+    }
+}
+
+bool SaxWriterHelper::writeString(const OUString& rWriteOutString, bool bDoNormalization,
+                                  bool bNormalizeWhitespace)
+{
+    FinishStartElement();
+    return convertToXML(rWriteOutString.getStr(), rWriteOutString.getLength(), bDoNormalization,
+                        bNormalizeWhitespace, mp_Sequence, nCurrentPos);
+}
+
+void SaxWriterHelper::startDocument()
+{
+    const char pc[] = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
+    const int nLen = strlen(pc);
+    if ((nCurrentPos + nLen) <= SEQUENCESIZE)
+    {
+        memcpy(mp_Sequence, pc, nLen);
+        nCurrentPos += nLen;
+    }
+    else
+    {
+        AddBytes(mp_Sequence, nCurrentPos, reinterpret_cast<sal_Int8 const*>(pc), nLen);
+    }
+    OSL_ENSURE(nCurrentPos <= SEQUENCESIZE, "not reset current position");
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = LINEFEED;
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+}
+
+#ifndef NDEBUG
+bool inrange(sal_Unicode c, sal_Unicode start, sal_Unicode end) { return c >= start && c <= end; }
+#endif
+
+void CheckValidName(OUString const& rName)
+{
+#ifdef NDEBUG
+    (void)rName;
+#else
+    assert(!rName.isEmpty());
+    bool hasColon(false);
+    for (sal_Int32 i = 0; i < rName.getLength(); ++i)
+    {
+        auto const c(rName[i]);
+        if (c == ':')
+        {
+            // see https://www.w3.org/TR/REC-xml-names/#ns-qualnames
+            SAL_WARN_IF(hasColon, "sax", "only one colon allowed: " << rName);
+            assert(!hasColon && "only one colon allowed");
+            hasColon = true;
+        }
+        else if (!rtl::isAsciiAlphanumeric(c) && c != '_' && c != '-' && c != '.'
+                 && !inrange(c, 0x00C0, 0x00D6) && !inrange(c, 0x00D8, 0x00F6)
+                 && !inrange(c, 0x00F8, 0x02FF) && !inrange(c, 0x0370, 0x037D)
+                 && !inrange(c, 0x037F, 0x1FFF) && !inrange(c, 0x200C, 0x200D)
+                 && !inrange(c, 0x2070, 0x218F) && !inrange(c, 0x2C00, 0x2FEF)
+                 && !inrange(c, 0x3001, 0xD7FF) && !inrange(c, 0xF900, 0xFDCF)
+                 && !inrange(c, 0xFDF0, 0xFFFD) && c != 0x00B7 && !inrange(c, 0x0300, 0x036F)
+                 && !inrange(c, 0x203F, 0x2040))
+        {
+            // https://www.w3.org/TR/xml11/#NT-NameChar
+            // (currently we don't warn about invalid start chars)
+            SAL_WARN("sax", "unexpected character in attribute name: " << rName);
+            assert(!"unexpected character in attribute name");
+        }
+    }
+#endif
+}
+
+SaxInvalidCharacterError SaxWriterHelper::startElement(const OUString& rName,
+                                                       const Reference<XAttributeList>& xAttribs)
+{
+    FinishStartElement();
+
+#ifdef DBG_UTIL
+    m_DebugStartedElements.push(rName);
+    ::std::set<OUString> DebugAttributes;
+#endif
+
+    mp_Sequence[nCurrentPos] = '<';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    SaxInvalidCharacterError eRet(SAX_NONE);
+    CheckValidName(rName);
+    if (!writeString(rName, false, false))
+        eRet = SAX_ERROR;
+
+    sal_Int16 nAttribCount = xAttribs.is() ? xAttribs->getLength() : 0;
+    for (sal_Int16 i = 0; i < nAttribCount; i++)
+    {
+        mp_Sequence[nCurrentPos] = ' ';
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+
+        OUString const& rAttrName(xAttribs->getNameByIndex(i));
+#ifdef DBG_UTIL
+        // Well-formedness constraint: Unique Att Spec
+        assert(DebugAttributes.find(rAttrName) == DebugAttributes.end());
+        DebugAttributes.insert(rAttrName);
+#endif
+        CheckValidName(rAttrName);
+        if (!writeString(rAttrName, false, false))
+            eRet = SAX_ERROR;
+
+        mp_Sequence[nCurrentPos] = '=';
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+        mp_Sequence[nCurrentPos] = '"';
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+
+        if (!writeString(xAttribs->getValueByIndex(i), true, true) && eRet != SAX_ERROR)
+            eRet = SAX_WARNING;
+
+        mp_Sequence[nCurrentPos] = '"';
+        nCurrentPos++;
+        if (nCurrentPos == SEQUENCESIZE)
+            nCurrentPos = writeSequence();
+    }
+
+    m_bStartElementFinished = false; // because the '>' character is not added,
+        // because it is possible, that the "/>"
+        // characters have to add
+    return eRet;
+}
+
+bool SaxWriterHelper::FinishEmptyElement()
+{
+    if (m_bStartElementFinished)
+        return false;
+
+    mp_Sequence[nCurrentPos] = '/';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '>';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    m_bStartElementFinished = true;
+
+    return true;
+}
+
+bool SaxWriterHelper::endElement(const OUString& rName)
+{
+    FinishStartElement();
+
+    mp_Sequence[nCurrentPos] = '<';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '/';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    CheckValidName(rName);
+    bool bRet(writeString(rName, false, false));
+
+    mp_Sequence[nCurrentPos] = '>';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    return bRet;
+}
+
+void SaxWriterHelper::endDocument()
+{
+    if (nCurrentPos > 0)
+    {
+        m_Sequence.realloc(nCurrentPos);
+        nCurrentPos = writeSequence();
+        //m_Sequence.realloc(SEQUENCESIZE);
+    }
+}
+
+void SaxWriterHelper::clearBuffer()
+{
+    FinishStartElement();
+    if (nCurrentPos > 0)
+    {
+        m_Sequence.realloc(nCurrentPos);
+        nCurrentPos = writeSequence();
+        m_Sequence.realloc(SEQUENCESIZE);
+        // Be sure to update the array pointer after the reallocation.
+        mp_Sequence = m_Sequence.getArray();
+    }
+}
+
+bool SaxWriterHelper::processingInstruction(const OUString& rTarget, const OUString& rData)
+{
+    FinishStartElement();
+    mp_Sequence[nCurrentPos] = '<';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '?';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    bool bRet(writeString(rTarget, false, false));
+
+    mp_Sequence[nCurrentPos] = ' ';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    if (!writeString(rData, false, false))
+        bRet = false;
+
+    mp_Sequence[nCurrentPos] = '?';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '>';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    return bRet;
+}
+
+void SaxWriterHelper::startCDATA()
+{
+    FinishStartElement();
+    if ((nCurrentPos + 9) <= SEQUENCESIZE)
+    {
+        memcpy(&(mp_Sequence[nCurrentPos]), "<![CDATA[", 9);
+        nCurrentPos += 9;
+    }
+    else
+        AddBytes(mp_Sequence, nCurrentPos, reinterpret_cast<sal_Int8 const*>("<![CDATA["), 9);
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+}
+
+void SaxWriterHelper::endCDATA()
+{
+    FinishStartElement();
+    if ((nCurrentPos + 3) <= SEQUENCESIZE)
+    {
+        memcpy(&(mp_Sequence[nCurrentPos]), "]]>", 3);
+        nCurrentPos += 3;
+    }
+    else
+        AddBytes(mp_Sequence, nCurrentPos, reinterpret_cast<sal_Int8 const*>("]]>"), 3);
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+}
+
+bool SaxWriterHelper::comment(const OUString& rComment)
+{
+    FinishStartElement();
+    mp_Sequence[nCurrentPos] = '<';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '!';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '-';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '-';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    bool bRet(writeString(rComment, false, false));
+
+    mp_Sequence[nCurrentPos] = '-';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '-';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+    mp_Sequence[nCurrentPos] = '>';
+    nCurrentPos++;
+    if (nCurrentPos == SEQUENCESIZE)
+        nCurrentPos = writeSequence();
+
+    return bRet;
+}
+
+sal_Int32 SaxWriterHelper::calcXMLByteLength(const OUString& rStr, bool bDoNormalization,
+                                             bool bNormalizeWhitespace)
+{
+    sal_Int32 nOutputLength = 0;
+    sal_uInt32 nSurrogate = 0;
+
+    const sal_Unicode* pStr = rStr.getStr();
+    sal_Int32 nStrLen = rStr.getLength();
+    for (sal_Int32 i = 0; i < nStrLen; i++)
+    {
+        sal_uInt16 c = pStr[i];
+        if (!IsInvalidChar(c) && (c >= 0x0001) && (c <= 0x007F))
+        {
+            if (bDoNormalization)
+            {
+                switch (c)
+                {
+                    case '&': // resemble to &amp;
+                        nOutputLength += 5;
+                        break;
+                    case '<': // &lt;
+                    case '>': // &gt;
+                        nOutputLength += 4;
+                        break;
+                    case '\'': // &apos;
+                    case '"': // &quot;
+                    case 13: // &#x0d;
+                        nOutputLength += 6;
+                        break;
+
+                    case 10: // &#x0a;
+                    case 9: // &#x09;
+                        if (bNormalizeWhitespace)
+                        {
+                            nOutputLength += 6;
+                        }
+                        else
+                        {
+                            nOutputLength++;
+                        }
+                        break;
+                    default:
+                        nOutputLength++;
+                }
+            }
+            else
+            {
+                nOutputLength++;
+            }
+        }
+        else
+        {
+            // Deal with replacements
+            if (bDoNormalization && !m_Replacements.empty())
+            {
+                // search
+                const ReplacementPair* it = findXMLReplacement(&pStr[i], nStrLen - i);
+
+                if (it != nullptr)
+                {
+                    nOutputLength
+                        += ::rtl::OUStringToOString(it->name, RTL_TEXTENCODING_UTF8).getLength();
+                    i += it->replacement.getLength() - 1;
+                    continue;
+                }
+            }
+
+            // Deal with other unicode cases
+            if (rtl::isHighSurrogate(c))
+            {
+                // save surrogate
+                nSurrogate = c;
+            }
+            else if (rtl::isLowSurrogate(c))
+            {
+                // 2. surrogate: write as UTF-8 (if range is OK
+                if (nSurrogate)
+                    nOutputLength += 4;
+                nSurrogate = 0;
+            }
+            else if (c > 0x07FF)
+            {
+                nOutputLength += 3;
+            }
+            else
+            {
+                nOutputLength += 2;
+            }
+        }
+
+        // surrogate processing
+        if ((nSurrogate != 0) && !rtl::isHighSurrogate(c))
+            nSurrogate = 0;
+    }
+
+    return nOutputLength;
+}
+
+const ReplacementPair* SaxWriterHelper::findXMLReplacement(const sal_Unicode* pStr,
+                                                           sal_Int32 nStrLen)
+{
+    for (size_t iter = 0; iter < m_Replacements.size(); ++iter)
+    {
+        if (m_Replacements[iter].replacement.getLength() > nStrLen)
+            continue;
+        sal_Int32 matches = m_Replacements[iter].replacement.compareTo(
+            std::u16string_view(pStr, m_Replacements[iter].replacement.getLength()));
+        if (matches == 0)
+            return &m_Replacements[iter];
+        if (matches > 0)
+            return nullptr;
+    }
+    return nullptr;
+}
+
+class SAXWriter : public WeakImplHelper<XWriter, XServiceInfo>
+{
+public:
+    SAXWriter()
+        : m_bDocStarted(false)
+        , m_bIsCDATA(false)
+        , m_bForceLineBreak(false)
+        , m_bAllowLineBreak(false)
+        , m_nLevel(0)
+    {
+    }
+
+public: // XActiveDataSource
+    virtual void SAL_CALL setOutputStream(const Reference<XOutputStream>& aStream) override
+    {
+        try
+        {
+            // temporary: set same stream again to clear buffer
+            if (m_out == aStream && m_pSaxWriterHelper && m_bDocStarted)
+                m_pSaxWriterHelper->clearBuffer();
+            else
+            {
+                m_out = aStream;
+                m_pSaxWriterHelper.reset(new SaxWriterHelper(m_out));
+                m_bDocStarted = false;
+                m_nLevel = 0;
+                m_bIsCDATA = false;
+            }
+        }
+        catch (const SAXException& e)
+        {
+            throw css::lang::WrappedTargetRuntimeException(e.Message, getXWeak(),
+                                                           e.WrappedException);
+        }
+    }
+    virtual Reference<XOutputStream> SAL_CALL getOutputStream() override { return m_out; }
+
+public: // XDocumentHandler
+    virtual void SAL_CALL startDocument() override;
+
+    virtual void SAL_CALL endDocument() override;
+
+    virtual void SAL_CALL startElement(const OUString& aName,
+                                       const Reference<XAttributeList>& xAttribs) override;
+
+    virtual void SAL_CALL endElement(const OUString& aName) override;
+
+    virtual void SAL_CALL characters(const OUString& aChars) override;
+
+    virtual void SAL_CALL ignorableWhitespace(const OUString& aWhitespaces) override;
+    virtual void SAL_CALL processingInstruction(const OUString& aTarget,
+                                                const OUString& aData) override;
+    virtual void SAL_CALL setDocumentLocator(const Reference<XLocator>& xLocator) override;
+    virtual void SAL_CALL setCustomEntityNames(
+        const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>&
+            replacements) override;
+
+public: // XExtendedDocumentHandler
+    virtual void SAL_CALL startCDATA() override;
+    virtual void SAL_CALL endCDATA() override;
+    virtual void SAL_CALL comment(const OUString& sComment) override;
+    virtual void SAL_CALL unknown(const OUString& sString) override;
+    virtual void SAL_CALL allowLineBreak() override;
+
+public: // XServiceInfo
+    OUString SAL_CALL getImplementationName() override;
+    Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+    sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+    sal_Int32 getIndentPrefixLength(sal_Int32 nFirstLineBreakOccurrence) noexcept;
+
+    Reference<XOutputStream> m_out;
+    std::unique_ptr<SaxWriterHelper> m_pSaxWriterHelper;
+
+    // Status information
+    bool m_bDocStarted : 1;
+    bool m_bIsCDATA : 1;
+    bool m_bForceLineBreak : 1;
+    bool m_bAllowLineBreak : 1;
+    sal_Int32 m_nLevel;
+};
+
+sal_Int32 SAXWriter::getIndentPrefixLength(sal_Int32 nFirstLineBreakOccurrence) noexcept
+{
+    sal_Int32 nLength = -1;
+    if (m_pSaxWriterHelper)
+    {
+        if (m_bForceLineBreak
+            || (m_bAllowLineBreak
+                && ((nFirstLineBreakOccurrence + m_pSaxWriterHelper->GetLastColumnCount())
+                    > MAXCOLUMNCOUNT)))
+            nLength = m_nLevel;
+    }
+    m_bForceLineBreak = false;
+    m_bAllowLineBreak = false;
+    return nLength;
+}
+
+bool isFirstCharWhitespace(const sal_Unicode* p) noexcept { return *p == ' '; }
+
+// XServiceInfo
+OUString SAXWriter::getImplementationName() { return "com.sun.star.extensions.xml.sax.Writer"; }
+
+// XServiceInfo
+sal_Bool SAXWriter::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence<OUString> SAXWriter::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.sax.Writer" };
+}
+
+void SAXWriter::startDocument()
+{
+    if (m_bDocStarted || !m_out.is() || !m_pSaxWriterHelper)
+    {
+        throw SAXException();
+    }
+    m_bDocStarted = true;
+    m_pSaxWriterHelper->startDocument();
+}
+
+void SAXWriter::endDocument()
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException("endDocument called before startDocument", Reference<XInterface>(),
+                           Any());
+    }
+    if (m_nLevel)
+    {
+        throw SAXException("unexpected end of document", Reference<XInterface>(), Any());
+    }
+    m_pSaxWriterHelper->endDocument();
+    try
+    {
+        m_out->closeOutput();
+    }
+    catch (const IOException&)
+    {
+        css::uno::Any anyEx = cppu::getCaughtException();
+        throw SAXException("IO exception during closing the IO Stream", Reference<XInterface>(),
+                           anyEx);
+    }
+}
+
+void SAXWriter::startElement(const OUString& aName, const Reference<XAttributeList>& xAttribs)
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException("startElement called before startDocument", {}, {});
+    }
+    if (m_bIsCDATA)
+    {
+        throw SAXException("startElement call not allowed with CDATA sections", {}, {});
+    }
+
+    sal_Int32 nLength(0);
+    if (m_bAllowLineBreak)
+    {
+        sal_Int32 nAttribCount = xAttribs.is() ? xAttribs->getLength() : 0;
+
+        nLength++; // "<"
+        nLength += m_pSaxWriterHelper->calcXMLByteLength(aName, false, false); // the tag name
+
+        sal_Int16 n;
+        for (n = 0; n < static_cast<sal_Int16>(nAttribCount); n++)
+        {
+            nLength++; // " "
+            OUString tmp = xAttribs->getNameByIndex(n);
+
+            nLength += m_pSaxWriterHelper->calcXMLByteLength(tmp, false, false);
+
+            nLength += 2; // ="
+
+            tmp = xAttribs->getValueByIndex(n);
+
+            nLength += m_pSaxWriterHelper->calcXMLByteLength(tmp, true, true);
+
+            nLength += 1; // "
+        }
+
+        nLength++; // '>'
+    }
+
+    // Is there a new indentation necessary ?
+    sal_Int32 nPrefix(getIndentPrefixLength(nLength));
+
+    // write into sequence
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    SaxInvalidCharacterError eRet(m_pSaxWriterHelper->startElement(aName, xAttribs));
+
+    m_nLevel++;
+
+    if (eRet == SAX_WARNING)
+    {
+        throw SAXInvalidCharacterException(
+            "Invalid character during XML-Export in an attribute value", {}, {});
+    }
+    else if (eRet == SAX_ERROR)
+    {
+        throw SAXException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+void SAXWriter::endElement(const OUString& aName)
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException();
+    }
+    m_nLevel--;
+
+    if (m_nLevel < 0)
+    {
+        throw SAXException();
+    }
+    bool bRet(true);
+
+    // check here because Helper's endElement is not always called
+#ifdef DBG_UTIL
+    assert(!m_pSaxWriterHelper->m_DebugStartedElements.empty());
+    // Well-formedness constraint: Element Type Match
+    assert(aName == m_pSaxWriterHelper->m_DebugStartedElements.top());
+    m_pSaxWriterHelper->m_DebugStartedElements.pop();
+#endif
+
+    if (m_pSaxWriterHelper->FinishEmptyElement())
+        m_bForceLineBreak = false;
+    else
+    {
+        // only ascii chars allowed
+        sal_Int32 nLength(0);
+        if (m_bAllowLineBreak)
+            nLength = 3 + m_pSaxWriterHelper->calcXMLByteLength(aName, false, false);
+        sal_Int32 nPrefix = getIndentPrefixLength(nLength);
+
+        if (nPrefix >= 0)
+            m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+        bRet = m_pSaxWriterHelper->endElement(aName);
+    }
+
+    if (!bRet)
+    {
+        throw SAXException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+void SAXWriter::characters(const OUString& aChars)
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException("characters method called before startDocument", {}, {});
+    }
+
+    bool bThrowException(false);
+    if (!aChars.isEmpty())
+    {
+        if (m_bIsCDATA)
+            bThrowException = !m_pSaxWriterHelper->writeString(aChars, false, false);
+        else
+        {
+            // Note : nFirstLineBreakOccurrence is not exact, because we don't know, how
+            //        many 2 and 3 byte chars are inbetween. However this whole stuff
+            //        is eitherway for pretty printing only, so it does not need to be exact.
+            sal_Int32 nLength(0);
+            sal_Int32 nIndentPrefix(-1);
+            if (m_bAllowLineBreak)
+            {
+                // returns position of first ascii 10 within the string, -1 when no 10 in string.
+                sal_Int32 nFirstLineBreakOccurrence = aChars.indexOf(LINEFEED);
+
+                nLength = m_pSaxWriterHelper->calcXMLByteLength(aChars, !m_bIsCDATA, false);
+                nIndentPrefix = getIndentPrefixLength(
+                    nFirstLineBreakOccurrence >= 0 ? nFirstLineBreakOccurrence : nLength);
+            }
+            else
+                nIndentPrefix = getIndentPrefixLength(nLength);
+
+            // insert indentation
+            if (nIndentPrefix >= 0)
+            {
+                if (isFirstCharWhitespace(aChars.getStr()))
+                    m_pSaxWriterHelper->insertIndentation(nIndentPrefix - 1);
+                else
+                    m_pSaxWriterHelper->insertIndentation(nIndentPrefix);
+            }
+            bThrowException = !m_pSaxWriterHelper->writeString(aChars, true, false);
+        }
+    }
+    if (bThrowException)
+    {
+        throw SAXInvalidCharacterException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+void SAXWriter::ignorableWhitespace(const OUString&)
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException();
+    }
+
+    m_bForceLineBreak = true;
+}
+
+void SAXWriter::processingInstruction(const OUString& aTarget, const OUString& aData)
+{
+    if (!m_bDocStarted || m_bIsCDATA)
+    {
+        throw SAXException();
+    }
+
+    sal_Int32 nLength(0);
+    if (m_bAllowLineBreak)
+    {
+        nLength = 2; // "<?"
+        nLength += m_pSaxWriterHelper->calcXMLByteLength(aTarget, false, false);
+
+        nLength += 1; // " "
+
+        nLength += m_pSaxWriterHelper->calcXMLByteLength(aData, false, false);
+
+        nLength += 2; // "?>"
+    }
+
+    sal_Int32 nPrefix = getIndentPrefixLength(nLength);
+
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    if (!m_pSaxWriterHelper->processingInstruction(aTarget, aData))
+    {
+        throw SAXException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+void SAXWriter::setDocumentLocator(const Reference<XLocator>&) {}
+
+void SAXWriter::setCustomEntityNames(
+    const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>& replacements)
+{
+    m_pSaxWriterHelper->setCustomEntityNames(replacements);
+}
+
+void SAXWriter::startCDATA()
+{
+    if (!m_bDocStarted || m_bIsCDATA)
+    {
+        throw SAXException();
+    }
+
+    sal_Int32 nPrefix = getIndentPrefixLength(9);
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    m_pSaxWriterHelper->startCDATA();
+
+    m_bIsCDATA = true;
+}
+
+void SAXWriter::endCDATA()
+{
+    if (!m_bDocStarted || !m_bIsCDATA)
+    {
+        throw SAXException("endCDATA was called without startCDATA", {}, {});
+    }
+
+    sal_Int32 nPrefix = getIndentPrefixLength(3);
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    m_pSaxWriterHelper->endCDATA();
+
+    m_bIsCDATA = false;
+}
+
+void SAXWriter::comment(const OUString& sComment)
+{
+    if (!m_bDocStarted || m_bIsCDATA)
+    {
+        throw SAXException();
+    }
+
+    sal_Int32 nLength(0);
+    if (m_bAllowLineBreak)
+    {
+        nLength = 4; // "<!--"
+        nLength += m_pSaxWriterHelper->calcXMLByteLength(sComment, false, false);
+
+        nLength += 3;
+    }
+
+    sal_Int32 nPrefix = getIndentPrefixLength(nLength);
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    if (!m_pSaxWriterHelper->comment(sComment))
+    {
+        throw SAXException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+void SAXWriter::allowLineBreak()
+{
+    if (!m_bDocStarted || m_bAllowLineBreak)
+    {
+        throw SAXException();
+    }
+
+    m_bAllowLineBreak = true;
+}
+
+void SAXWriter::unknown(const OUString& sString)
+{
+    if (!m_bDocStarted)
+    {
+        throw SAXException();
+    }
+    if (m_bIsCDATA)
+    {
+        throw SAXException();
+    }
+
+    if (sString.startsWith("<?xml"))
+        return;
+
+    sal_Int32 nLength(0);
+    if (m_bAllowLineBreak)
+        nLength = m_pSaxWriterHelper->calcXMLByteLength(sString, false, false);
+
+    sal_Int32 nPrefix = getIndentPrefixLength(nLength);
+    if (nPrefix >= 0)
+        m_pSaxWriterHelper->insertIndentation(nPrefix);
+
+    if (!m_pSaxWriterHelper->writeString(sString, false, false))
+    {
+        throw SAXException("Invalid character during XML-Export", {}, {});
+    }
+}
+
+} // namespace
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_extensions_xml_sax_Writer_get_implementation(css::uno::XComponentContext*,
+                                                          css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new SAXWriter);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/expatwrap/xml2utf.cxx b/sax/source/expatwrap/xml2utf.cxx
new file mode 100644
index 0000000000..5b3e4b9e1c
--- /dev/null
+++ b/sax/source/expatwrap/xml2utf.cxx
@@ -0,0 +1,519 @@
+/* -*- 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 <string.h>
+
+#include <algorithm>
+
+#include <sal/types.h>
+
+#include <rtl/textenc.h>
+#include <rtl/tencinfo.h>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <xml2utf.hxx>
+#include <memory>
+
+
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+
+
+namespace sax_expatwrap {
+
+sal_Int32 XMLFile2UTFConverter::readAndConvert( Sequence<sal_Int8> &seq , sal_Int32 nMaxToRead )
+{
+    if( ! m_in.is() ) {
+        throw NotConnectedException();
+    }
+    if( ! m_bStarted ) {
+        // it should be possible to find the encoding attribute
+        // within the first 512 bytes == 128 chars in UCS-4
+        nMaxToRead = ::std::max( sal_Int32(512) , nMaxToRead );
+    }
+
+    sal_Int32 nRead;
+    Sequence< sal_Int8 > seqStart;
+    while( true )
+    {
+        nRead = m_in->readSomeBytes( seq , nMaxToRead );
+
+        if( nRead + seqStart.getLength())
+        {
+            // if nRead is 0, the file is already eof.
+            if( ! m_bStarted && nRead )
+            {
+                // ensure that enough data is available to parse encoding
+                if( seqStart.hasElements() )
+                {
+                  // prefix with what we had so far.
+                  sal_Int32 nLength = seq.getLength();
+                  seq.realloc( seqStart.getLength() + nLength );
+
+                  memmove (seq.getArray() + seqStart.getLength(),
+                       seq.getConstArray(),
+                       nLength);
+                  memcpy  (seq.getArray(),
+                       seqStart.getConstArray(),
+                       seqStart.getLength());
+                }
+
+                // autodetection with the first bytes
+                if( ! isEncodingRecognizable( seq ) )
+                {
+                  // remember what we have so far.
+                  seqStart = seq;
+
+                  // read more !
+                  continue;
+                }
+                if( scanForEncoding( seq ) || !m_sEncoding.isEmpty() ) {
+                    // initialize decoding
+                    initializeDecoding();
+                }
+                seqStart = Sequence < sal_Int8 > ();
+            }
+
+            // do the encoding
+            if( m_pText2Unicode && m_pUnicode2Text &&
+                m_pText2Unicode->canContinue() ) {
+
+                Sequence<sal_Unicode> seqUnicode = m_pText2Unicode->convert( seq );
+                seq = m_pUnicode2Text->convert( seqUnicode.getConstArray(), seqUnicode.getLength() );
+            }
+
+            if( ! m_bStarted )
+            {
+                // it must now be ensured, that no encoding attribute exist anymore
+                // ( otherwise the expat-Parser will crash )
+                // This must be done after decoding !
+                // ( e.g. Files decoded in ucs-4 cannot be read properly )
+                m_bStarted = true;
+                removeEncoding( seq );
+            }
+            nRead = seq.getLength();
+        }
+
+        break;
+    }
+    return nRead;
+}
+
+void XMLFile2UTFConverter::removeEncoding( Sequence<sal_Int8> &seq )
+{
+    const sal_Int8 *pSource = seq.getArray();
+    if (seq.getLength() < 5 || strncmp(reinterpret_cast<const char *>(pSource), "<?xml", 5))
+        return;
+
+    // scan for encoding
+    OString str( reinterpret_cast<char const *>(pSource), seq.getLength() );
+
+    // cut sequence to first line break
+    // find first line break;
+    int nMax = str.indexOf( 10 );
+    if( nMax >= 0 )
+    {
+        str = str.copy( 0 , nMax );
+    }
+
+    int nFound = str.indexOf( " encoding" );
+    if( nFound < 0 )        return;
+
+    int nStop;
+    int nStart = str.indexOf( "\"" , nFound );
+    if( nStart < 0 || str.indexOf( "'" , nFound ) < nStart )
+    {
+        nStart = str.indexOf( "'" , nFound );
+        nStop  = str.indexOf( "'" , nStart +1 );
+    }
+    else
+    {
+        nStop  = str.indexOf( "\"" , nStart +1);
+    }
+
+    if( nStart >= 0 && nStop >= 0 && nStart+1 < nStop )
+    {
+        // remove encoding tag from file
+        memmove(        &( seq.getArray()[nFound] ) ,
+                        &( seq.getArray()[nStop+1]) ,
+                        seq.getLength() - nStop -1);
+        seq.realloc( seq.getLength() - ( nStop+1 - nFound ) );
+    }
+}
+
+// Checks, if enough data has been accumulated to recognize the encoding
+bool XMLFile2UTFConverter::isEncodingRecognizable( const Sequence< sal_Int8 > &seq)
+{
+    const sal_Int8 *pSource = seq.getConstArray();
+    bool bCheckIfFirstClosingBracketExists = false;
+
+    if( seq.getLength() < 8 ) {
+        // no recognition possible, when less than 8 bytes are available
+        return false;
+    }
+
+    if( ! strncmp( reinterpret_cast<const char *>(pSource), "<?xml", 5 ) ) {
+        // scan if the <?xml tag finishes within this buffer
+        bCheckIfFirstClosingBracketExists = true;
+    }
+    else if( ('<' == pSource[0] || '<' == pSource[2] ) &&
+             ('?' == pSource[4] || '?' == pSource[6] ) )
+    {
+        // check for utf-16
+        bCheckIfFirstClosingBracketExists = true;
+    }
+    else if( ( '<' == pSource[1] || '<' == pSource[3] ) &&
+             ( '?' == pSource[5] || '?' == pSource[7] ) )
+    {
+        // check for
+        bCheckIfFirstClosingBracketExists = true;
+    }
+
+    if( bCheckIfFirstClosingBracketExists )
+    {
+        // whole <?xml tag is valid
+        return std::find(seq.begin(), seq.end(), '>') != seq.end();
+    }
+
+    // No <? tag in front, no need for a bigger buffer
+    return true;
+}
+
+bool XMLFile2UTFConverter::scanForEncoding( Sequence< sal_Int8 > &seq )
+{
+    const sal_uInt8 *pSource = reinterpret_cast<const sal_uInt8*>( seq.getConstArray() );
+    bool bReturn = true;
+
+    if( seq.getLength() < 4 ) {
+        // no recognition possible, when less than 4 bytes are available
+        return false;
+    }
+
+    // first level : detect possible file formats
+    if (seq.getLength() >= 5 && !strncmp(reinterpret_cast<const char *>(pSource), "<?xml", 5)) {
+        // scan for encoding
+        OString str( reinterpret_cast<const char *>(pSource), seq.getLength() );
+
+        // cut sequence to first line break
+        //find first line break;
+        int nMax = str.indexOf( 10 );
+        if( nMax >= 0 )
+        {
+            str = str.copy( 0 , nMax );
+        }
+
+        int nFound = str.indexOf( " encoding" );
+        if( nFound >= 0 ) {
+            int nStop;
+            int nStart = str.indexOf( "\"" , nFound );
+            if( nStart < 0 || str.indexOf( "'" , nFound ) < nStart )
+            {
+                nStart = str.indexOf( "'" , nFound );
+                nStop  = str.indexOf( "'" , nStart +1 );
+            }
+            else
+            {
+                nStop  = str.indexOf( "\"" , nStart +1);
+            }
+            if( nStart >= 0 && nStop >= 0 && nStart+1 < nStop )
+            {
+                // encoding found finally
+                m_sEncoding = str.copy( nStart+1 , nStop - nStart - 1 );
+            }
+        }
+    }
+    else if( 0xFE == pSource[0] &&
+             0xFF == pSource[1] ) {
+        // UTF-16 big endian
+        // conversion is done so that encoding information can be easily extracted
+        m_sEncoding = "utf-16"_ostr;
+    }
+    else if( 0xFF == pSource[0] &&
+             0xFE == pSource[1] ) {
+        // UTF-16 little endian
+        // conversion is done so that encoding information can be easily extracted
+        m_sEncoding = "utf-16"_ostr;
+    }
+    else if( 0x00 == pSource[0] && 0x3c == pSource[1]  && 0x00 == pSource[2] && 0x3f == pSource[3] ) {
+        // UTF-16 big endian without byte order mark (this is (strictly speaking) an error.)
+        // The byte order mark is simply added
+
+        // simply add the byte order mark !
+        seq.realloc( seq.getLength() + 2 );
+        memmove( &( seq.getArray()[2] ) , seq.getArray() , seq.getLength() - 2 );
+        reinterpret_cast<sal_uInt8*>(seq.getArray())[0] = 0xFE;
+        reinterpret_cast<sal_uInt8*>(seq.getArray())[1] = 0xFF;
+
+        m_sEncoding = "utf-16"_ostr;
+    }
+    else if( 0x3c == pSource[0] && 0x00 == pSource[1]  && 0x3f == pSource[2] && 0x00 == pSource[3] ) {
+        // UTF-16 little endian without byte order mark (this is (strictly speaking) an error.)
+        // The byte order mark is simply added
+
+        seq.realloc( seq.getLength() + 2 );
+        memmove( &( seq.getArray()[2] ) , seq.getArray() , seq.getLength() - 2 );
+        reinterpret_cast<sal_uInt8*>(seq.getArray())[0] = 0xFF;
+        reinterpret_cast<sal_uInt8*>(seq.getArray())[1] = 0xFE;
+
+        m_sEncoding = "utf-16"_ostr;
+    }
+    else if( 0xEF == pSource[0] &&
+             0xBB == pSource[1] &&
+             0xBF == pSource[2] )
+    {
+        // UTF-8 BOM (byte order mark); signifies utf-8, and not byte order
+        // The BOM is removed.
+        memmove( seq.getArray(), &( seq.getArray()[3] ), seq.getLength()-3 );
+        seq.realloc( seq.getLength() - 3 );
+        m_sEncoding = "utf-8"_ostr;
+    }
+    else if( 0x00 == pSource[0] && 0x00 == pSource[1]  && 0x00 == pSource[2] && 0x3c == pSource[3] ) {
+        // UCS-4 big endian
+        m_sEncoding = "ucs-4"_ostr;
+    }
+    else if( 0x3c == pSource[0] && 0x00 == pSource[1]  && 0x00 == pSource[2] && 0x00 == pSource[3] ) {
+        // UCS-4 little endian
+        m_sEncoding = "ucs-4"_ostr;
+    }
+/* TODO: no need to test for the moment since we return sal_False like default case anyway
+    else if( 0x4c == pSource[0] && 0x6f == pSource[1]  &&
+             0xa7 == static_cast<unsigned char> (pSource[2]) &&
+             0x94 == static_cast<unsigned char> (pSource[3]) ) {
+        // EBCDIC
+        bReturn = sal_False;   // must be extended
+    }
+*/
+    else {
+        // other
+        // UTF8 is directly recognized by the parser.
+        bReturn = false;
+    }
+
+    return bReturn;
+}
+
+void XMLFile2UTFConverter::initializeDecoding()
+{
+
+    if( !m_sEncoding.isEmpty() )
+    {
+        rtl_TextEncoding encoding = rtl_getTextEncodingFromMimeCharset( m_sEncoding.getStr() );
+        if( encoding != RTL_TEXTENCODING_UTF8 )
+        {
+            m_pText2Unicode = std::make_unique<Text2UnicodeConverter>( m_sEncoding );
+            m_pUnicode2Text = std::make_unique<Unicode2TextConverter>( RTL_TEXTENCODING_UTF8 );
+        }
+    }
+}
+
+
+// Text2UnicodeConverter
+
+
+Text2UnicodeConverter::Text2UnicodeConverter( const OString &sEncoding )
+    : m_convText2Unicode(nullptr)
+    , m_contextText2Unicode(nullptr)
+{
+    rtl_TextEncoding encoding = rtl_getTextEncodingFromMimeCharset( sEncoding.getStr() );
+    if( RTL_TEXTENCODING_DONTKNOW == encoding )
+    {
+        m_bCanContinue = false;
+        m_bInitialized = false;
+    }
+    else
+    {
+        init( encoding );
+    }
+}
+
+Text2UnicodeConverter::~Text2UnicodeConverter()
+{
+    if( m_bInitialized )
+    {
+        rtl_destroyTextToUnicodeContext( m_convText2Unicode , m_contextText2Unicode );
+        rtl_destroyUnicodeToTextConverter( m_convText2Unicode );
+    }
+}
+
+void Text2UnicodeConverter::init( rtl_TextEncoding encoding )
+{
+    m_bCanContinue = true;
+    m_bInitialized = true;
+
+    m_convText2Unicode  = rtl_createTextToUnicodeConverter(encoding);
+    m_contextText2Unicode = rtl_createTextToUnicodeContext( m_convText2Unicode );
+}
+
+
+Sequence<sal_Unicode> Text2UnicodeConverter::convert( const Sequence<sal_Int8> &seqText )
+{
+    sal_uInt32 uiInfo;
+    sal_Size nSrcCvtBytes   = 0;
+    sal_Size nTargetCount   = 0;
+    sal_Size nSourceCount   = 0;
+
+    // the whole source size
+    sal_Int32   nSourceSize = seqText.getLength() + m_seqSource.getLength();
+    Sequence<sal_Unicode>   seqUnicode ( nSourceSize );
+
+    const sal_Int8 *pbSource = seqText.getConstArray();
+    std::unique_ptr<sal_Int8[]> pbTempMem;
+
+    if( m_seqSource.hasElements() ) {
+        // put old rest and new byte sequence into one array
+        pbTempMem.reset(new sal_Int8[ nSourceSize ]);
+        memcpy( pbTempMem.get() , m_seqSource.getConstArray() , m_seqSource.getLength() );
+        memcpy( &(pbTempMem[ m_seqSource.getLength() ]) , seqText.getConstArray() , seqText.getLength() );
+        pbSource = pbTempMem.get();
+
+        // set to zero again
+        m_seqSource = Sequence< sal_Int8 >();
+    }
+
+    while( true ) {
+
+        /* All invalid characters are transformed to the unicode undefined char */
+        nTargetCount +=     rtl_convertTextToUnicode(
+                                    m_convText2Unicode,
+                                    m_contextText2Unicode,
+                                    reinterpret_cast<const char *>(&( pbSource[nSourceCount] )),
+                                    nSourceSize - nSourceCount ,
+                                    &( seqUnicode.getArray()[ nTargetCount ] ),
+                                    seqUnicode.getLength() - nTargetCount,
+                                    RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_DEFAULT   |
+                                    RTL_TEXTTOUNICODE_FLAGS_MBUNDEFINED_DEFAULT |
+                                    RTL_TEXTTOUNICODE_FLAGS_INVALID_DEFAULT,
+                                    &uiInfo,
+                                    &nSrcCvtBytes );
+        nSourceCount += nSrcCvtBytes;
+
+        if( uiInfo & RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL ) {
+            // save necessary bytes for next conversion
+            seqUnicode.realloc( seqUnicode.getLength() * 2 );
+            continue;
+        }
+        break;
+    }
+    if( uiInfo & RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOOSMALL ) {
+        m_seqSource.realloc( nSourceSize - nSourceCount );
+        memcpy( m_seqSource.getArray() , &(pbSource[nSourceCount]) , nSourceSize-nSourceCount );
+    }
+
+    // set to correct unicode size
+    seqUnicode.realloc( nTargetCount );
+
+    return seqUnicode;
+}
+
+
+// Unicode2TextConverter
+
+
+Unicode2TextConverter::Unicode2TextConverter( rtl_TextEncoding encoding )
+{
+    m_convUnicode2Text  = rtl_createUnicodeToTextConverter( encoding );
+    m_contextUnicode2Text = rtl_createUnicodeToTextContext( m_convUnicode2Text );
+}
+
+
+Unicode2TextConverter::~Unicode2TextConverter()
+{
+    rtl_destroyUnicodeToTextContext( m_convUnicode2Text , m_contextUnicode2Text );
+    rtl_destroyUnicodeToTextConverter( m_convUnicode2Text );
+}
+
+
+Sequence<sal_Int8> Unicode2TextConverter::convert(const sal_Unicode *puSource , sal_Int32 nSourceSize)
+{
+    std::unique_ptr<sal_Unicode[]> puTempMem;
+
+    if( m_seqSource.hasElements() ) {
+        // For surrogates !
+        // put old rest and new byte sequence into one array
+        // In general when surrogates are used, they should be rarely
+        // cut off between two convert()-calls. So this code is used
+        // rarely and the extra copy is acceptable.
+        puTempMem.reset(new sal_Unicode[ nSourceSize + m_seqSource.getLength()]);
+        memcpy( puTempMem.get() ,
+                m_seqSource.getConstArray() ,
+                m_seqSource.getLength() * sizeof( sal_Unicode ) );
+        memcpy(
+            &(puTempMem[ m_seqSource.getLength() ]) ,
+            puSource ,
+            nSourceSize*sizeof( sal_Unicode ) );
+        puSource = puTempMem.get();
+        nSourceSize += m_seqSource.getLength();
+
+        m_seqSource = Sequence< sal_Unicode > ();
+    }
+
+
+    sal_Size nTargetCount = 0;
+    sal_Size nSourceCount = 0;
+
+    sal_uInt32 uiInfo;
+    sal_Size nSrcCvtChars;
+
+    // take nSourceSize * 3 as preference
+    // this is an upper boundary for converting to utf8,
+    // which most often used as the target.
+    sal_Int32 nSeqSize =  nSourceSize * 3;
+
+    Sequence<sal_Int8>  seqText( nSeqSize );
+    char *pTarget = reinterpret_cast<char *>(seqText.getArray());
+    while( true ) {
+
+        nTargetCount += rtl_convertUnicodeToText(
+                                    m_convUnicode2Text,
+                                    m_contextUnicode2Text,
+                                    &( puSource[nSourceCount] ),
+                                    nSourceSize - nSourceCount ,
+                                    &( pTarget[nTargetCount] ),
+                                    nSeqSize - nTargetCount,
+                                    RTL_UNICODETOTEXT_FLAGS_UNDEFINED_DEFAULT |
+                                    RTL_UNICODETOTEXT_FLAGS_INVALID_DEFAULT ,
+                                    &uiInfo,
+                                    &nSrcCvtChars);
+        nSourceCount += nSrcCvtChars;
+
+        if( uiInfo & RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL ) {
+            nSeqSize = nSeqSize *2;
+            seqText.realloc( nSeqSize );  // double array size
+            pTarget = reinterpret_cast<char *>(seqText.getArray());
+            continue;
+        }
+        break;
+    }
+
+    // for surrogates
+    if( uiInfo & RTL_UNICODETOTEXT_INFO_SRCBUFFERTOSMALL ) {
+        m_seqSource.realloc( nSourceSize - nSourceCount );
+        memcpy( m_seqSource.getArray() ,
+                &(puSource[nSourceCount]),
+                (nSourceSize - nSourceCount) * sizeof( sal_Unicode ) );
+    }
+
+    // reduce the size of the buffer (fast, no copy necessary)
+    seqText.realloc( nTargetCount );
+
+    return seqText;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/fastparser/fastparser.cxx b/sax/source/fastparser/fastparser.cxx
new file mode 100644
index 0000000000..e0338e053c
--- /dev/null
+++ b/sax/source/fastparser/fastparser.cxx
@@ -0,0 +1,1680 @@
+/* -*- 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 <sax/fastparser.hxx>
+#include <sax/fastattribs.hxx>
+#include <utility>
+#include <xml2utf.hxx>
+
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/sax/FastToken.hpp>
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+#include <com/sun/star/xml/sax/XFastContextHandler.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+#include <osl/conditn.hxx>
+#include <rtl/ref.hxx>
+#include <sal/log.hxx>
+#include <salhelper/thread.hxx>
+#include <comphelper/diagnose_ex.hxx>
+#include <o3tl/string_view.hxx>
+
+#include <queue>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <stack>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+#include <cassert>
+#include <cstring>
+#include <libxml/parser.h>
+
+// Inverse of libxml's BAD_CAST.
+#define XML_CAST( str ) reinterpret_cast< const char* >( str )
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::xml::sax;
+using namespace ::com::sun::star::io;
+using namespace com::sun::star;
+using namespace sax_fastparser;
+
+static void NormalizeURI( OUString& rName );
+
+namespace {
+
+struct Event;
+class FastLocatorImpl;
+struct NamespaceDefine;
+struct Entity;
+
+typedef std::unordered_map< OUString, sal_Int32 > NamespaceMap;
+
+struct EventList
+{
+    std::vector<Event> maEvents;
+    bool mbIsAttributesEmpty;
+};
+
+enum class CallbackType { START_ELEMENT, END_ELEMENT, CHARACTERS, PROCESSING_INSTRUCTION, DONE, EXCEPTION };
+
+struct Event
+{
+    CallbackType maType;
+    sal_Int32 mnElementToken;
+    OUString msNamespace;
+    OUString msElementName;
+    rtl::Reference< FastAttributeList > mxAttributes;
+    rtl::Reference< FastAttributeList > mxDeclAttributes;
+    OUString msChars;
+};
+
+struct NameWithToken
+{
+    OUString msName;
+    sal_Int32 mnToken;
+
+    NameWithToken(OUString sName, sal_Int32 nToken) :
+        msName(std::move(sName)), mnToken(nToken) {}
+};
+
+struct SaxContext
+{
+    Reference< XFastContextHandler > mxContext;
+    sal_Int32 mnElementToken;
+    std::optional<OUString>  moNamespace;
+    std::optional<OUString> moElementName;
+
+    SaxContext( sal_Int32 nElementToken, const OUString& aNamespace, const OUString& aElementName ):
+            mnElementToken(nElementToken)
+    {
+        if (nElementToken == FastToken::DONTKNOW)
+        {
+            moNamespace = aNamespace;
+            moElementName = aElementName;
+        }
+    }
+};
+
+struct ParserData
+{
+    css::uno::Reference< css::xml::sax::XFastDocumentHandler > mxDocumentHandler;
+    rtl::Reference<FastTokenHandlerBase>                       mxTokenHandler;
+    css::uno::Reference< css::xml::sax::XErrorHandler >        mxErrorHandler;
+    css::uno::Reference< css::xml::sax::XFastNamespaceHandler >mxNamespaceHandler;
+
+    ParserData();
+};
+
+struct NamespaceDefine
+{
+    OString     maPrefix;
+    sal_Int32   mnToken;
+    OUString    maNamespaceURL;
+
+    NamespaceDefine( OString aPrefix, sal_Int32 nToken, OUString aNamespaceURL )
+        : maPrefix(std::move( aPrefix )), mnToken( nToken ), maNamespaceURL(std::move( aNamespaceURL )) {}
+    NamespaceDefine() : mnToken(-1) {}
+};
+
+// Entity binds all information needed for a single file | single call of parseStream
+struct Entity : public ParserData
+{
+    // Amount of work producer sends to consumer in one iteration:
+    static const size_t mnEventListSize = 1000;
+
+    // unique for each Entity instance:
+
+    // Number of valid events in mxProducedEvents:
+    size_t mnProducedEventsSize;
+    std::optional<EventList> mxProducedEvents;
+    std::queue<EventList> maPendingEvents;
+    std::queue<EventList> maUsedEvents;
+    std::mutex maEventProtector;
+
+    static const size_t mnEventLowWater = 4;
+    static const size_t mnEventHighWater = 8;
+    osl::Condition maConsumeResume;
+    osl::Condition maProduceResume;
+    // Event we use to store data if threading is disabled:
+    Event maSharedEvent;
+
+    // copied in copy constructor:
+
+    // Allow to disable threading for small documents:
+    bool                                    mbEnableThreads;
+    css::xml::sax::InputSource              maStructSource;
+    xmlParserCtxtPtr                        mpParser;
+    ::sax_expatwrap::XMLFile2UTFConverter   maConverter;
+
+    // Exceptions cannot be thrown through the C-XmlParser (possible
+    // resource leaks), therefore any exception thrown by a UNO callback
+    // must be saved somewhere until the C-XmlParser is stopped.
+    css::uno::Any                           maSavedException;
+    std::mutex                              maSavedExceptionMutex;
+    void saveException( const Any & e );
+    // Thread-safe check if maSavedException has value
+    bool hasException();
+    void throwException( const ::rtl::Reference< FastLocatorImpl > &xDocumentLocator,
+                         bool mbDuringParse );
+
+    std::stack< NameWithToken, std::vector<NameWithToken> > maNamespaceStack;
+    /* Context for main thread consuming events.
+     * startElement() stores the data, which characters() and endElement() uses
+     */
+    std::stack< SaxContext, std::vector<SaxContext> >  maContextStack;
+    // Determines which elements of maNamespaceDefines are valid in current context
+    std::stack< sal_uInt32, std::vector<sal_uInt32> >  maNamespaceCount;
+    std::vector< NamespaceDefine >                     maNamespaceDefines;
+
+    explicit Entity( const ParserData& rData );
+    Entity( const Entity& rEntity ) = delete;
+    Entity& operator=( const Entity& rEntity ) = delete;
+    void startElement( Event const *pEvent );
+    void characters( const OUString& sChars );
+    void endElement();
+    void processingInstruction( const OUString& rTarget, const OUString& rData );
+    EventList& getEventList();
+    Event& getEvent( CallbackType aType );
+};
+
+// Stuff for custom entity names
+struct ReplacementPair
+{
+    OUString name;
+    OUString replacement;
+};
+inline bool operator<(const ReplacementPair& lhs, const ReplacementPair& rhs)
+{
+    return lhs.name < rhs.name;
+}
+inline bool operator<(const ReplacementPair& lhs, const char* rhs)
+{
+    return lhs.name.compareToAscii(rhs) < 0;
+}
+
+} // namespace
+
+namespace sax_fastparser {
+
+class FastSaxParserImpl
+{
+public:
+    explicit FastSaxParserImpl();
+    ~FastSaxParserImpl();
+
+private:
+    std::vector<ReplacementPair> m_Replacements;
+    std::vector<xmlEntityPtr> m_TemporalEntities;
+
+public:
+    // XFastParser
+    /// @throws css::xml::sax::SAXException
+    /// @throws css::io::IOException
+    /// @throws css::uno::RuntimeException
+    void parseStream( const css::xml::sax::InputSource& aInputSource );
+    /// @throws css::uno::RuntimeException
+    void setFastDocumentHandler( const css::uno::Reference< css::xml::sax::XFastDocumentHandler >& Handler );
+    /// @throws css::uno::RuntimeException
+    void setTokenHandler( const css::uno::Reference< css::xml::sax::XFastTokenHandler >& Handler );
+    /// @throws css::lang::IllegalArgumentException
+    /// @throws css::uno::RuntimeException
+    void registerNamespace( const OUString& NamespaceURL, sal_Int32 NamespaceToken );
+    /// @throws css::lang::IllegalArgumentException
+    /// @throws css::uno::RuntimeException
+    OUString const & getNamespaceURL( std::u16string_view rPrefix );
+    /// @throws css::uno::RuntimeException
+    void setErrorHandler( const css::uno::Reference< css::xml::sax::XErrorHandler >& Handler );
+    /// @throws css::uno::RuntimeException
+    void setNamespaceHandler( const css::uno::Reference< css::xml::sax::XFastNamespaceHandler >& Handler);
+    // Fake DTD file
+    void setCustomEntityNames(
+       const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>& replacements);
+
+    // called by the C callbacks of the expat parser
+    void callbackStartElement( const xmlChar *localName , const xmlChar* prefix, const xmlChar* URI,
+        int numNamespaces, const xmlChar** namespaces, int numAttributes, const xmlChar **attributes );
+    void callbackEndElement();
+    void callbackCharacters( const xmlChar* s, int nLen );
+    void callbackProcessingInstruction( const xmlChar *target, const xmlChar *data );
+    xmlEntityPtr callbackGetEntity( const xmlChar *name );
+
+    void pushEntity(const ParserData&, xml::sax::InputSource const&);
+    void popEntity();
+    Entity& getEntity()             { return *mpTop; }
+    void parse();
+    void produce( bool bForceFlush = false );
+    bool m_bIgnoreMissingNSDecl;
+    bool m_bDisableThreadedParser;
+
+private:
+    bool consume(EventList&);
+    void deleteUsedEvents();
+    void sendPendingCharacters();
+    void addUnknownElementWithPrefix(const xmlChar **attributes, int i, rtl::Reference< FastAttributeList > const & xAttributes);
+
+    sal_Int32 GetToken( const xmlChar* pName );
+    /// @throws css::xml::sax::SAXException
+    sal_Int32 GetTokenWithPrefix( const xmlChar* pPrefix, const xmlChar* pName );
+    /// @throws css::xml::sax::SAXException
+    OUString const & GetNamespaceURL( std::string_view rPrefix );
+    sal_Int32 GetNamespaceToken( const OUString& rNamespaceURL );
+    sal_Int32 GetTokenWithContextNamespace( sal_Int32 nNamespaceToken, const xmlChar* pName );
+    void DefineNamespace( const OString& rPrefix, const OUString& namespaceURL );
+
+private:
+    std::mutex maMutex; ///< Protecting whole parseStream() execution
+    ::rtl::Reference< FastLocatorImpl >     mxDocumentLocator;
+    NamespaceMap                            maNamespaceMap;
+
+    ParserData maData;                      /// Cached parser configuration for next call of parseStream().
+
+    Entity *mpTop;                          /// std::stack::top() is amazingly slow => cache this.
+    std::stack< Entity > maEntities;        /// Entity stack for each call of parseStream().
+    std::vector<char> pendingCharacters;    /// Data from characters() callback that needs to be sent.
+};
+
+} // namespace sax_fastparser
+
+namespace {
+
+class ParserThread: public salhelper::Thread
+{
+    FastSaxParserImpl *mpParser;
+public:
+    explicit ParserThread(FastSaxParserImpl *pParser): Thread("Parser"), mpParser(pParser) {}
+private:
+    virtual void execute() override
+    {
+        try
+        {
+            mpParser->parse();
+        }
+        catch (...)
+        {
+            Entity &rEntity = mpParser->getEntity();
+            rEntity.getEvent( CallbackType::EXCEPTION );
+            mpParser->produce( true );
+        }
+    }
+};
+
+extern "C" {
+
+static void call_callbackStartElement(void *userData, const xmlChar *localName , const xmlChar* prefix, const xmlChar* URI,
+    int numNamespaces, const xmlChar** namespaces, int numAttributes, int /*defaultedAttributes*/, const xmlChar **attributes)
+{
+    FastSaxParserImpl* pFastParser = static_cast<FastSaxParserImpl*>( userData );
+    pFastParser->callbackStartElement( localName, prefix, URI, numNamespaces, namespaces, numAttributes, attributes );
+}
+
+static void call_callbackEndElement(void *userData, const xmlChar* /*localName*/, const xmlChar* /*prefix*/, const xmlChar* /*URI*/)
+{
+    FastSaxParserImpl* pFastParser = static_cast<FastSaxParserImpl*>( userData );
+    pFastParser->callbackEndElement();
+}
+
+static void call_callbackCharacters( void *userData , const xmlChar *s , int nLen )
+{
+    FastSaxParserImpl* pFastParser = static_cast<FastSaxParserImpl*>( userData );
+    pFastParser->callbackCharacters( s, nLen );
+}
+
+static void call_callbackProcessingInstruction( void *userData, const xmlChar *target, const xmlChar *data )
+{
+    FastSaxParserImpl* pFastParser = static_cast<FastSaxParserImpl*>( userData );
+    pFastParser->callbackProcessingInstruction( target, data );
+}
+
+static xmlEntityPtr call_callbackGetEntity( void *userData, const xmlChar *name)
+{
+    FastSaxParserImpl* pFastParser = static_cast<FastSaxParserImpl*>( userData );
+    return pFastParser->callbackGetEntity( name );
+}
+
+}
+
+class FastLocatorImpl : public WeakImplHelper< XLocator >
+{
+public:
+    explicit FastLocatorImpl(FastSaxParserImpl *p) : mpParser(p) {}
+
+    void dispose() { mpParser = nullptr; }
+    /// @throws RuntimeException
+    void checkDispose() const { if( !mpParser ) throw DisposedException(); }
+
+    //XLocator
+    virtual sal_Int32 SAL_CALL getColumnNumber() override;
+    virtual sal_Int32 SAL_CALL getLineNumber() override;
+    virtual OUString SAL_CALL getPublicId() override;
+    virtual OUString SAL_CALL getSystemId() override;
+
+private:
+    FastSaxParserImpl *mpParser;
+};
+
+sal_Int32 SAL_CALL FastLocatorImpl::getColumnNumber()
+{
+    checkDispose();
+    return xmlSAX2GetColumnNumber( mpParser->getEntity().mpParser );
+}
+
+sal_Int32 SAL_CALL FastLocatorImpl::getLineNumber()
+{
+    checkDispose();
+    return xmlSAX2GetLineNumber( mpParser->getEntity().mpParser );
+}
+
+OUString SAL_CALL FastLocatorImpl::getPublicId()
+{
+    checkDispose();
+    return mpParser->getEntity().maStructSource.sPublicId;
+}
+
+OUString SAL_CALL FastLocatorImpl::getSystemId()
+{
+    checkDispose();
+    return mpParser->getEntity().maStructSource.sSystemId;
+}
+
+ParserData::ParserData()
+{}
+
+Entity::Entity(const ParserData& rData)
+    : ParserData(rData)
+    , mnProducedEventsSize(0)
+    , mbEnableThreads(false)
+    , mpParser(nullptr)
+{
+}
+
+void Entity::startElement( Event const *pEvent )
+{
+    const sal_Int32& nElementToken = pEvent->mnElementToken;
+    const OUString& aNamespace = pEvent->msNamespace;
+    const OUString& aElementName = pEvent->msElementName;
+
+    // Use un-wrapped pointers to avoid significant acquire/release overhead
+    XFastContextHandler *pParentContext = nullptr;
+    if( !maContextStack.empty() )
+    {
+        pParentContext = maContextStack.top().mxContext.get();
+        if( !pParentContext )
+        {
+            maContextStack.push( SaxContext(nElementToken, aNamespace, aElementName) );
+            return;
+        }
+    }
+
+    maContextStack.push( SaxContext( nElementToken, aNamespace, aElementName ) );
+
+    try
+    {
+        const Reference< XFastAttributeList > & xAttr( pEvent->mxAttributes );
+        Reference< XFastContextHandler > xContext;
+
+        if ( mxNamespaceHandler.is() )
+        {
+            const Sequence< xml::Attribute > NSDeclAttribs = pEvent->mxDeclAttributes->getUnknownAttributes();
+            for (const auto& rNSDeclAttrib : NSDeclAttribs)
+            {
+                mxNamespaceHandler->registerNamespace( rNSDeclAttrib.Name, rNSDeclAttrib.Value );
+            }
+        }
+
+        if( nElementToken == FastToken::DONTKNOW )
+        {
+            if( pParentContext )
+                xContext = pParentContext->createUnknownChildContext( aNamespace, aElementName, xAttr );
+            else if( mxDocumentHandler.is() )
+                xContext = mxDocumentHandler->createUnknownChildContext( aNamespace, aElementName, xAttr );
+
+            if( xContext.is() )
+            {
+                xContext->startUnknownElement( aNamespace, aElementName, xAttr );
+            }
+        }
+        else
+        {
+            if( pParentContext )
+                xContext = pParentContext->createFastChildContext( nElementToken, xAttr );
+            else if( mxDocumentHandler.is() )
+                xContext = mxDocumentHandler->createFastChildContext( nElementToken, xAttr );
+
+            if( xContext.is() )
+                xContext->startFastElement( nElementToken, xAttr );
+        }
+        // swap the reference we own in to avoid referencing thrash.
+        maContextStack.top().mxContext = std::move( xContext );
+    }
+    catch (...)
+    {
+        saveException( ::cppu::getCaughtException() );
+    }
+}
+
+void Entity::characters( const OUString& sChars )
+{
+    if (maContextStack.empty())
+    {
+        // Malformed XML stream !?
+        return;
+    }
+
+    XFastContextHandler * pContext( maContextStack.top().mxContext.get() );
+    if( pContext ) try
+    {
+        pContext->characters( sChars );
+    }
+    catch (...)
+    {
+        saveException( ::cppu::getCaughtException() );
+    }
+}
+
+void Entity::endElement()
+{
+    if (maContextStack.empty())
+    {
+        // Malformed XML stream !?
+        return;
+    }
+
+    const SaxContext& aContext = maContextStack.top();
+    XFastContextHandler* pContext( aContext.mxContext.get() );
+    if( pContext )
+        try
+        {
+            sal_Int32 nElementToken = aContext.mnElementToken;
+            if( nElementToken != FastToken::DONTKNOW )
+                pContext->endFastElement( nElementToken );
+            else
+                pContext->endUnknownElement( *aContext.moNamespace, *aContext.moElementName );
+        }
+        catch (...)
+        {
+            saveException( ::cppu::getCaughtException() );
+        }
+    maContextStack.pop();
+}
+
+void Entity::processingInstruction( const OUString& rTarget, const OUString& rData )
+{
+    if( mxDocumentHandler.is() ) try
+    {
+        mxDocumentHandler->processingInstruction( rTarget, rData );
+    }
+    catch (...)
+    {
+        saveException( ::cppu::getCaughtException() );
+    }
+}
+
+EventList& Entity::getEventList()
+{
+    if (!mxProducedEvents)
+    {
+        std::unique_lock aGuard(maEventProtector);
+        if (!maUsedEvents.empty())
+        {
+            mxProducedEvents = std::move(maUsedEvents.front());
+            maUsedEvents.pop();
+            aGuard.unlock(); // unlock
+            mnProducedEventsSize = 0;
+        }
+        if (!mxProducedEvents)
+        {
+            mxProducedEvents.emplace();
+            mxProducedEvents->maEvents.resize(mnEventListSize);
+            mxProducedEvents->mbIsAttributesEmpty = false;
+            mnProducedEventsSize = 0;
+        }
+    }
+    return *mxProducedEvents;
+}
+
+Event& Entity::getEvent( CallbackType aType )
+{
+    if (!mbEnableThreads)
+        return maSharedEvent;
+
+    EventList& rEventList = getEventList();
+    if (mnProducedEventsSize == rEventList.maEvents.size())
+    {
+        SAL_WARN_IF(!maSavedException.hasValue(), "sax",
+            "Event vector should only exceed " << mnEventListSize <<
+            " temporarily while an exception is pending");
+        rEventList.maEvents.resize(mnProducedEventsSize + 1);
+    }
+    Event& rEvent = rEventList.maEvents[mnProducedEventsSize++];
+    rEvent.maType = aType;
+    return rEvent;
+}
+
+OUString lclGetErrorMessage( xmlParserCtxtPtr ctxt, std::u16string_view sSystemId, sal_Int32 nLine )
+{
+    const char* pMessage;
+    const xmlError* error = xmlCtxtGetLastError( ctxt );
+    if( error && error->message )
+        pMessage = error->message;
+    else
+        pMessage = "unknown error";
+    return OUString::Concat("[") + sSystemId + " line " + OUString::number(nLine) + "]: " +
+           OUString(pMessage, strlen(pMessage), RTL_TEXTENCODING_ASCII_US);
+}
+
+// throw an exception, but avoid callback if
+// during a threaded produce
+void Entity::throwException( const ::rtl::Reference< FastLocatorImpl > &xDocumentLocator,
+                             bool mbDuringParse )
+{
+    // Error during parsing !
+    Any savedException;
+    {
+        std::scoped_lock g(maSavedExceptionMutex);
+        if (maSavedException.hasValue())
+        {
+            savedException.setValue(&maSavedException, cppu::UnoType<decltype(maSavedException)>::get());
+        }
+    }
+    SAXParseException aExcept(
+        lclGetErrorMessage( mpParser,
+                            xDocumentLocator->getSystemId(),
+                            xDocumentLocator->getLineNumber() ),
+        Reference< XInterface >(),
+        savedException,
+        xDocumentLocator->getPublicId(),
+        xDocumentLocator->getSystemId(),
+        xDocumentLocator->getLineNumber(),
+        xDocumentLocator->getColumnNumber()
+    );
+
+    // error handler is set, it may throw the exception
+    if( !mbDuringParse || !mbEnableThreads )
+    {
+        if (mxErrorHandler.is() )
+            mxErrorHandler->fatalError( Any( aExcept ) );
+    }
+
+    // error handler has not thrown, but parsing must stop => throw ourselves
+    throw aExcept;
+}
+
+// In the single threaded case we emit events via our C
+// callbacks, so any exception caught must be queued up until
+// we can safely re-throw it from our C++ parent of parse()
+
+// If multi-threaded, we need to push an EXCEPTION event, at
+// which point we transfer ownership of maSavedException to
+// the consuming thread.
+void Entity::saveException( const Any & e )
+{
+    // fdo#81214 - allow the parser to run on after an exception,
+    // unexpectedly some 'startElements' produce a UNO_QUERY_THROW
+    // for XComponent; and yet expect to continue parsing.
+    SAL_WARN("sax", "Unexpected exception from XML parser " << exceptionToString(e));
+    std::scoped_lock g(maSavedExceptionMutex);
+    if (maSavedException.hasValue())
+    {
+        SAL_INFO("sax.fastparser", "discarding exception, already have one");
+    }
+    else
+    {
+        maSavedException = e;
+    }
+}
+
+bool Entity::hasException()
+{
+    std::scoped_lock g(maSavedExceptionMutex);
+    return maSavedException.hasValue();
+}
+
+} // namespace
+
+namespace sax_fastparser {
+
+FastSaxParserImpl::FastSaxParserImpl() :
+    m_bIgnoreMissingNSDecl(false),
+    m_bDisableThreadedParser(false),
+    mpTop(nullptr)
+{
+    mxDocumentLocator.set( new FastLocatorImpl( this ) );
+}
+
+FastSaxParserImpl::~FastSaxParserImpl()
+{
+    if( mxDocumentLocator.is() )
+        mxDocumentLocator->dispose();
+    for (auto& entity : m_TemporalEntities)
+    {
+        if (!entity)
+            continue;
+        xmlNodePtr pPtr = reinterpret_cast<xmlNodePtr>(entity);
+        xmlUnlinkNode(pPtr);
+        xmlFreeNode(pPtr);
+    }
+}
+
+void FastSaxParserImpl::DefineNamespace( const OString& rPrefix, const OUString& namespaceURL )
+{
+    Entity& rEntity = getEntity();
+    assert(!rEntity.maNamespaceCount.empty()); // need a context!
+
+    sal_uInt32 nOffset = rEntity.maNamespaceCount.top()++;
+    if( rEntity.maNamespaceDefines.size() <= nOffset )
+        rEntity.maNamespaceDefines.resize( rEntity.maNamespaceDefines.size() + 64 );
+
+    rEntity.maNamespaceDefines[nOffset] = NamespaceDefine( rPrefix, GetNamespaceToken( namespaceURL ), namespaceURL );
+}
+
+sal_Int32 FastSaxParserImpl::GetToken(const xmlChar* pName)
+{
+    return FastTokenHandlerBase::getTokenFromChars( getEntity(). mxTokenHandler.get(),
+                                                    XML_CAST( pName ) ); // uses utf-8
+}
+
+sal_Int32 FastSaxParserImpl::GetTokenWithPrefix( const xmlChar* pPrefix, const xmlChar* pName )
+{
+    Entity& rEntity = getEntity();
+    if (rEntity.maNamespaceCount.empty())
+        return FastToken::DONTKNOW;
+
+    std::string_view sPrefix(XML_CAST(pPrefix));
+    sal_uInt32 nNamespace = rEntity.maNamespaceCount.top();
+    while( nNamespace-- )
+    {
+        const auto & rNamespaceDefine = rEntity.maNamespaceDefines[nNamespace];
+        if( rNamespaceDefine.maPrefix == sPrefix )
+            return GetTokenWithContextNamespace(rNamespaceDefine.mnToken, pName);
+    }
+
+    if (!m_bIgnoreMissingNSDecl)
+        throw SAXException("No namespace defined for " + OStringToOUString(sPrefix,
+            RTL_TEXTENCODING_UTF8), {}, {});
+
+    return FastToken::DONTKNOW;
+}
+
+sal_Int32 FastSaxParserImpl::GetNamespaceToken( const OUString& rNamespaceURL )
+{
+    NamespaceMap::iterator aIter( maNamespaceMap.find( rNamespaceURL ) );
+    if( aIter != maNamespaceMap.end() )
+        return (*aIter).second;
+    else
+        return FastToken::DONTKNOW;
+}
+
+OUString const & FastSaxParserImpl::GetNamespaceURL( std::string_view rPrefix )
+{
+    Entity& rEntity = getEntity();
+    if( !rEntity.maNamespaceCount.empty() )
+    {
+        sal_uInt32 nNamespace = rEntity.maNamespaceCount.top();
+        while( nNamespace-- )
+            if( rEntity.maNamespaceDefines[nNamespace].maPrefix == rPrefix )
+                return rEntity.maNamespaceDefines[nNamespace].maNamespaceURL;
+    }
+
+    throw SAXException("No namespace defined for " + OUString::fromUtf8(rPrefix),
+            Reference< XInterface >(), Any());
+}
+
+sal_Int32 FastSaxParserImpl::GetTokenWithContextNamespace( sal_Int32 nNamespaceToken, const xmlChar* pName )
+{
+    if( nNamespaceToken != FastToken::DONTKNOW )
+    {
+        sal_Int32 nNameToken = GetToken( pName );
+        if( nNameToken != FastToken::DONTKNOW )
+            return nNamespaceToken | nNameToken;
+    }
+
+    return FastToken::DONTKNOW;
+}
+
+namespace
+{
+    class ParserCleanup
+    {
+    private:
+        FastSaxParserImpl& m_rParser;
+        Entity& m_rEntity;
+        rtl::Reference<ParserThread> m_xParser;
+    public:
+        ParserCleanup(FastSaxParserImpl& rParser, Entity& rEntity)
+            : m_rParser(rParser)
+            , m_rEntity(rEntity)
+        {
+        }
+        ~ParserCleanup()
+        {
+            if (m_rEntity.mpParser)
+            {
+                if (m_rEntity.mpParser->myDoc)
+                    xmlFreeDoc(m_rEntity.mpParser->myDoc);
+                xmlFreeParserCtxt(m_rEntity.mpParser);
+            }
+            joinThread();
+            m_rParser.popEntity();
+        }
+        void setThread(const rtl::Reference<ParserThread> &xParser)
+        {
+            m_xParser = xParser;
+        }
+        void joinThread()
+        {
+            if (m_xParser.is())
+            {
+                rtl::Reference<ParserThread> xToJoin = m_xParser;
+                m_xParser.clear();
+                xToJoin->join();
+            }
+        }
+    };
+}
+/***************
+*
+* parseStream does Parser-startup initializations. The FastSaxParser::parse() method does
+* the file-specific initialization work. (During a parser run, external files may be opened)
+*
+****************/
+void FastSaxParserImpl::parseStream(const InputSource& rStructSource)
+{
+    xmlInitParser();
+
+    // Only one text at one time
+    std::unique_lock guard( maMutex );
+
+    pushEntity(maData, rStructSource);
+    Entity& rEntity = getEntity();
+    ParserCleanup aEnsureFree(*this, rEntity);
+
+    // start the document
+    if( rEntity.mxDocumentHandler.is() )
+    {
+        rEntity.mxDocumentHandler->setDocumentLocator( mxDocumentLocator );
+        rEntity.mxDocumentHandler->startDocument();
+    }
+
+#ifdef EMSCRIPTEN
+    rEntity.mbEnableThreads = false;
+#else
+    if (!getenv("SAX_DISABLE_THREADS") && !m_bDisableThreadedParser)
+    {
+        Reference<css::io::XSeekable> xSeekable(rEntity.maStructSource.aInputStream, UNO_QUERY);
+        // available() is not __really__ relevant here, but leave it in as a heuristic for non-seekable streams
+        rEntity.mbEnableThreads = (xSeekable.is() && xSeekable->getLength() > 10000)
+                || (rEntity.maStructSource.aInputStream->available() > 10000);
+    }
+#endif
+
+    if (rEntity.mbEnableThreads)
+    {
+        rtl::Reference<ParserThread> xParser = new ParserThread(this);
+        xParser->launch();
+        aEnsureFree.setThread(xParser);
+        bool done = false;
+        do {
+            rEntity.maConsumeResume.wait();
+            rEntity.maConsumeResume.reset();
+
+            std::unique_lock aGuard(rEntity.maEventProtector);
+            while (!rEntity.maPendingEvents.empty())
+            {
+                if (rEntity.maPendingEvents.size() <= Entity::mnEventLowWater)
+                    rEntity.maProduceResume.set(); // start producer again
+
+                EventList aEventList = std::move(rEntity.maPendingEvents.front());
+                rEntity.maPendingEvents.pop();
+                aGuard.unlock(); // unlock
+
+                if (!consume(aEventList))
+                    done = true;
+
+                aGuard.lock(); // lock
+
+                if ( rEntity.maPendingEvents.size() <= Entity::mnEventLowWater )
+                {
+                    aGuard.unlock();
+                    for (auto& rEvent : aEventList.maEvents)
+                    {
+                        if (rEvent.mxAttributes.is())
+                        {
+                            rEvent.mxAttributes->clear();
+                            if( rEntity.mxNamespaceHandler.is() )
+                                rEvent.mxDeclAttributes->clear();
+                        }
+                        aEventList.mbIsAttributesEmpty = true;
+                    }
+                    aGuard.lock();
+                }
+
+                rEntity.maUsedEvents.push(std::move(aEventList));
+            }
+        } while (!done);
+        aEnsureFree.joinThread();
+        deleteUsedEvents();
+
+        // callbacks used inside XML_Parse may have caught an exception
+        // No need to lock maSavedExceptionMutex here because parser
+        // thread is joined.
+        if( rEntity.maSavedException.hasValue() )
+            rEntity.throwException( mxDocumentLocator, true );
+    }
+    else
+    {
+        parse();
+    }
+
+    // finish document
+    if( rEntity.mxDocumentHandler.is() )
+    {
+        rEntity.mxDocumentHandler->endDocument();
+    }
+}
+
+void FastSaxParserImpl::setFastDocumentHandler( const Reference< XFastDocumentHandler >& Handler )
+{
+    maData.mxDocumentHandler = Handler;
+}
+
+void FastSaxParserImpl::setTokenHandler( const Reference< XFastTokenHandler >& xHandler )
+{
+    assert( dynamic_cast< FastTokenHandlerBase *>( xHandler.get() ) && "we expect this handler to be a subclass of FastTokenHandlerBase" );
+    maData.mxTokenHandler = dynamic_cast< FastTokenHandlerBase *>( xHandler.get() );
+}
+
+void FastSaxParserImpl::registerNamespace( const OUString& NamespaceURL, sal_Int32 NamespaceToken )
+{
+    if( NamespaceToken < FastToken::NAMESPACE )
+        throw IllegalArgumentException("Invalid namespace token " + OUString::number(NamespaceToken), css::uno::Reference<css::uno::XInterface >(), 0);
+
+    if( GetNamespaceToken( NamespaceURL ) == FastToken::DONTKNOW )
+    {
+        maNamespaceMap[ NamespaceURL ] = NamespaceToken;
+        return;
+    }
+    throw IllegalArgumentException("namespace URL is already registered: " + NamespaceURL, css::uno::Reference<css::uno::XInterface >(), 0);
+}
+
+OUString const & FastSaxParserImpl::getNamespaceURL( std::u16string_view rPrefix )
+{
+    try
+    {
+        return GetNamespaceURL( OUStringToOString( rPrefix, RTL_TEXTENCODING_UTF8 ) );
+    }
+    catch (const Exception&)
+    {
+    }
+    throw IllegalArgumentException();
+}
+
+void FastSaxParserImpl::setErrorHandler(const Reference< XErrorHandler > & Handler)
+{
+    maData.mxErrorHandler = Handler;
+}
+
+void FastSaxParserImpl::setNamespaceHandler( const Reference< XFastNamespaceHandler >& Handler )
+{
+    maData.mxNamespaceHandler = Handler;
+}
+
+void FastSaxParserImpl::setCustomEntityNames(
+    const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>& replacements)
+{
+    m_Replacements.resize(replacements.size());
+    for (size_t i = 0; i < replacements.size(); ++i)
+    {
+        m_Replacements[i].name = replacements[i].First;
+        m_Replacements[i].replacement = replacements[i].Second;
+    }
+    if (m_Replacements.size() > 1)
+        std::sort(m_Replacements.begin(), m_Replacements.end());
+}
+
+void FastSaxParserImpl::deleteUsedEvents()
+{
+    Entity& rEntity = getEntity();
+    std::unique_lock aGuard(rEntity.maEventProtector);
+
+    while (!rEntity.maUsedEvents.empty())
+    {
+        { // the block makes sure that aEventList is destructed outside the lock
+            EventList aEventList = std::move(rEntity.maUsedEvents.front());
+            rEntity.maUsedEvents.pop();
+
+            aGuard.unlock(); // unlock
+        }
+
+        aGuard.lock(); // lock
+    }
+}
+
+void FastSaxParserImpl::produce( bool bForceFlush )
+{
+    Entity& rEntity = getEntity();
+    if (!(bForceFlush ||
+        rEntity.mnProducedEventsSize >= Entity::mnEventListSize))
+        return;
+
+    std::unique_lock aGuard(rEntity.maEventProtector);
+
+    while (rEntity.maPendingEvents.size() >= Entity::mnEventHighWater)
+    { // pause parsing for a bit
+        aGuard.unlock(); // unlock
+        rEntity.maProduceResume.wait();
+        rEntity.maProduceResume.reset();
+        aGuard.lock(); // lock
+    }
+
+    rEntity.maPendingEvents.push(std::move(*rEntity.mxProducedEvents));
+    rEntity.mxProducedEvents.reset();
+    assert(!rEntity.mxProducedEvents);
+
+    aGuard.unlock(); // unlock
+
+    rEntity.maConsumeResume.set();
+}
+
+bool FastSaxParserImpl::consume(EventList& rEventList)
+{
+    Entity& rEntity = getEntity();
+    rEventList.mbIsAttributesEmpty = false;
+    for (auto& rEvent : rEventList.maEvents)
+    {
+        switch (rEvent.maType)
+        {
+            case CallbackType::START_ELEMENT:
+                rEntity.startElement( &rEvent );
+                break;
+            case CallbackType::END_ELEMENT:
+                rEntity.endElement();
+                break;
+            case CallbackType::CHARACTERS:
+                rEntity.characters( rEvent.msChars );
+                break;
+            case CallbackType::PROCESSING_INSTRUCTION:
+                rEntity.processingInstruction(
+                    rEvent.msNamespace, rEvent.msElementName ); // ( target, data )
+                break;
+            case CallbackType::DONE:
+                return false;
+            case CallbackType::EXCEPTION:
+                rEntity.throwException( mxDocumentLocator, false );
+                [[fallthrough]]; // avoid unreachable code warning with some compilers
+            default:
+                assert(false);
+                return false;
+        }
+    }
+    return true;
+}
+
+void FastSaxParserImpl::pushEntity(const ParserData& rEntityData,
+        xml::sax::InputSource const& rSource)
+{
+    if (!rSource.aInputStream.is())
+        throw SAXException("No input source", Reference<XInterface>(), Any());
+
+    maEntities.emplace(rEntityData);
+    mpTop = &maEntities.top();
+
+    mpTop->maStructSource = rSource;
+
+    mpTop->maConverter.setInputStream(mpTop->maStructSource.aInputStream);
+    if (!mpTop->maStructSource.sEncoding.isEmpty())
+    {
+        mpTop->maConverter.setEncoding(OUStringToOString(mpTop->maStructSource.sEncoding, RTL_TEXTENCODING_ASCII_US));
+    }
+}
+
+void FastSaxParserImpl::popEntity()
+{
+    maEntities.pop();
+    mpTop = !maEntities.empty() ? &maEntities.top() : nullptr;
+}
+
+// starts parsing with actual parser !
+void FastSaxParserImpl::parse()
+{
+    const int BUFFER_SIZE = 16 * 1024;
+    Sequence< sal_Int8 > seqOut( BUFFER_SIZE );
+
+    Entity& rEntity = getEntity();
+
+    // set all necessary C-Callbacks
+    static xmlSAXHandler callbacks;
+    callbacks.startElementNs = call_callbackStartElement;
+    callbacks.endElementNs = call_callbackEndElement;
+    callbacks.characters = call_callbackCharacters;
+    callbacks.processingInstruction = call_callbackProcessingInstruction;
+    callbacks.getEntity = call_callbackGetEntity;
+    callbacks.initialized = XML_SAX2_MAGIC;
+    int nRead = 0;
+    do
+    {
+        nRead = rEntity.maConverter.readAndConvert( seqOut, BUFFER_SIZE );
+        if( nRead <= 0 )
+        {
+            if( rEntity.mpParser != nullptr )
+            {
+                if( xmlParseChunk( rEntity.mpParser, reinterpret_cast<const char*>(seqOut.getConstArray()), 0, 1 ) != XML_ERR_OK )
+                    rEntity.throwException( mxDocumentLocator, true );
+                if (rEntity.hasException())
+                    rEntity.throwException(mxDocumentLocator, true);
+            }
+            break;
+        }
+
+        bool bContinue = true;
+        if( rEntity.mpParser == nullptr )
+        {
+            // create parser with proper encoding (needs the first chunk of data)
+            rEntity.mpParser = xmlCreatePushParserCtxt( &callbacks, this,
+                reinterpret_cast<const char*>(seqOut.getConstArray()), nRead, nullptr );
+            if( !rEntity.mpParser )
+                throw SAXException("Couldn't create parser", Reference< XInterface >(), Any() );
+
+            // Tell libxml2 parser to decode entities in attribute values.
+            // Also allow XML attribute values which are larger than 10MB, because this used to work
+            // with expat.
+            // coverity[unsafe_xml_parse_config] - entity support is required
+            xmlCtxtUseOptions(rEntity.mpParser, XML_PARSE_NOENT | XML_PARSE_HUGE);
+        }
+        else
+        {
+            bContinue = xmlParseChunk( rEntity.mpParser, reinterpret_cast<const char*>(seqOut.getConstArray()), nRead, 0 )
+                            == XML_ERR_OK;
+        }
+
+        // callbacks used inside XML_Parse may have caught an exception
+        if (!bContinue)
+        {
+            rEntity.throwException( mxDocumentLocator, true );
+        }
+        if (rEntity.hasException())
+        {
+            rEntity.throwException( mxDocumentLocator, true );
+        }
+    } while( nRead > 0 );
+    rEntity.getEvent( CallbackType::DONE );
+    if( rEntity.mbEnableThreads )
+        produce( true );
+}
+
+// The C-Callbacks
+void FastSaxParserImpl::callbackStartElement(const xmlChar *localName , const xmlChar* prefix, const xmlChar* URI,
+    int numNamespaces, const xmlChar** namespaces, int numAttributes, const xmlChar **attributes)
+{
+    if (!pendingCharacters.empty())
+        sendPendingCharacters();
+    Entity& rEntity = getEntity();
+    if( rEntity.maNamespaceCount.empty() )
+    {
+        rEntity.maNamespaceCount.push(0);
+        DefineNamespace( "xml"_ostr, "http://www.w3.org/XML/1998/namespace");
+    }
+    else
+    {
+        rEntity.maNamespaceCount.push( rEntity.maNamespaceCount.top() );
+    }
+
+    // create attribute map and process namespace instructions
+    Event& rEvent = rEntity.getEvent( CallbackType::START_ELEMENT );
+    bool bIsAttributesEmpty = false;
+    if ( rEntity.mbEnableThreads )
+        bIsAttributesEmpty = rEntity.getEventList().mbIsAttributesEmpty;
+
+    if (rEvent.mxAttributes.is())
+    {
+        if( !bIsAttributesEmpty )
+            rEvent.mxAttributes->clear();
+    }
+    else
+        rEvent.mxAttributes.set(
+                new FastAttributeList( rEntity.mxTokenHandler.get() ) );
+
+    if( rEntity.mxNamespaceHandler.is() )
+    {
+        if (rEvent.mxDeclAttributes.is())
+        {
+            if( !bIsAttributesEmpty )
+                rEvent.mxDeclAttributes->clear();
+        }
+        else
+            rEvent.mxDeclAttributes.set(
+                new FastAttributeList( rEntity.mxTokenHandler.get() ) );
+    }
+
+    OUString sNamespace;
+    sal_Int32 nNamespaceToken = FastToken::DONTKNOW;
+    if (!rEntity.maNamespaceStack.empty())
+    {
+        sNamespace = rEntity.maNamespaceStack.top().msName;
+        nNamespaceToken = rEntity.maNamespaceStack.top().mnToken;
+    }
+
+    try
+    {
+        /*  #158414# Each element may define new namespaces, also for attributes.
+            First, process all namespaces, second, process the attributes after namespaces
+            have been initialized. */
+
+        // #158414# first: get namespaces
+        for (int i = 0; i < numNamespaces * 2; i += 2)
+        {
+            // namespaces[] is (prefix/URI)
+            if( namespaces[ i ] != nullptr )
+            {
+                OString aPrefix( XML_CAST( namespaces[ i ] ));
+                OUString namespaceURL( XML_CAST( namespaces[ i + 1 ] ), strlen( XML_CAST( namespaces[ i + 1 ] )), RTL_TEXTENCODING_UTF8 );
+                NormalizeURI( namespaceURL );
+                DefineNamespace(aPrefix, namespaceURL);
+                if( rEntity.mxNamespaceHandler.is() )
+                    rEvent.mxDeclAttributes->addUnknown( OString( XML_CAST( namespaces[ i ] ) ), OString( XML_CAST( namespaces[ i + 1 ] ) ) );
+            }
+            else
+            {
+                // default namespace
+                sNamespace = OUString( XML_CAST( namespaces[ i + 1 ] ), strlen( XML_CAST( namespaces[ i + 1 ] )), RTL_TEXTENCODING_UTF8 );
+                NormalizeURI( sNamespace );
+                nNamespaceToken = GetNamespaceToken( sNamespace );
+                if( rEntity.mxNamespaceHandler.is() )
+                    rEvent.mxDeclAttributes->addUnknown( ""_ostr, OString( XML_CAST( namespaces[ i + 1 ] ) ) );
+            }
+        }
+
+        if ( rEntity.mxTokenHandler.is() )
+        {
+            // #158414# second: fill attribute list with other attributes
+            rEvent.mxAttributes->reserve( numAttributes );
+            for (int i = 0; i < numAttributes * 5; i += 5)
+            {
+                // attributes[] is ( localname / prefix / nsURI / valueBegin / valueEnd )
+                if( attributes[ i + 1 ] != nullptr )
+                {
+                    sal_Int32 nAttributeToken = GetTokenWithPrefix(attributes[ i + 1 ], attributes[ i ]);
+                    if( nAttributeToken != FastToken::DONTKNOW )
+                        rEvent.mxAttributes->add( nAttributeToken, std::string_view(XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ]) );
+                    else
+                        addUnknownElementWithPrefix(attributes, i, rEvent.mxAttributes);
+                }
+                else
+                {
+                    sal_Int32 nAttributeToken = GetToken(attributes[ i ]);
+                    if( nAttributeToken != FastToken::DONTKNOW )
+                        rEvent.mxAttributes->add( nAttributeToken, std::string_view(XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ]) );
+                    else
+                    {
+                        SAL_WARN("xmloff", "unknown attribute " << XML_CAST( attributes[ i ] ) << "=" <<
+                            OString( XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ] ));
+                        rEvent.mxAttributes->addUnknown( XML_CAST( attributes[ i ] ),
+                            OString( XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ] ));
+                    }
+                }
+            }
+
+            if( prefix != nullptr )
+                rEvent.mnElementToken = GetTokenWithPrefix(prefix, localName);
+            else if( !sNamespace.isEmpty() )
+                rEvent.mnElementToken = GetTokenWithContextNamespace(nNamespaceToken, localName);
+            else
+                rEvent.mnElementToken = GetToken(localName);
+        }
+        else
+        {
+            for (int i = 0; i < numAttributes * 5; i += 5)
+            {
+                if( attributes[ i + 1 ] != nullptr )
+                    addUnknownElementWithPrefix(attributes, i, rEvent.mxAttributes);
+                else
+                    rEvent.mxAttributes->addUnknown( XML_CAST( attributes[ i ] ),
+                            OString( XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ] ));
+            }
+
+            rEvent.mnElementToken = FastToken::DONTKNOW;
+        }
+
+        if( rEvent.mnElementToken == FastToken::DONTKNOW )
+        {
+            OUString aElementPrefix;
+            if( prefix != nullptr )
+            {
+                aElementPrefix = OUString( XML_CAST( prefix ), strlen( XML_CAST( prefix )), RTL_TEXTENCODING_UTF8 );
+                if ( URI != nullptr )
+                    sNamespace = OUString( XML_CAST( URI ), strlen( XML_CAST( URI )), RTL_TEXTENCODING_UTF8 );
+                else if ( m_bIgnoreMissingNSDecl )
+                    sNamespace.clear();
+                else
+                    throw SAXException("No namespace defined for " + aElementPrefix, {}, {});
+                nNamespaceToken = GetNamespaceToken( sNamespace );
+            }
+            OUString aElementLocalName( XML_CAST( localName ), strlen( XML_CAST( localName )), RTL_TEXTENCODING_UTF8 );
+            rEvent.msNamespace = sNamespace;
+            if( aElementPrefix.isEmpty() )
+                rEvent.msElementName = std::move(aElementLocalName);
+            else
+                rEvent.msElementName = aElementPrefix + ":" + aElementLocalName;
+        }
+        else // token is always preferred.
+            rEvent.msElementName.clear();
+
+        rEntity.maNamespaceStack.push( NameWithToken(sNamespace, nNamespaceToken) );
+        if (rEntity.mbEnableThreads)
+            produce();
+        else
+        {
+            SAL_INFO("sax.fastparser", " startElement line " << mxDocumentLocator->getLineNumber() << " column " << mxDocumentLocator->getColumnNumber() << " " << ( prefix ? XML_CAST(prefix) : "(null)" ) << ":" << localName);
+            rEntity.startElement( &rEvent );
+        }
+    }
+    catch (...)
+    {
+        rEntity.saveException( ::cppu::getCaughtException() );
+    }
+}
+
+void FastSaxParserImpl::addUnknownElementWithPrefix(const xmlChar **attributes, int i, rtl::Reference< FastAttributeList > const & xAttributes)
+{
+    OUString aNamespaceURI;
+    if ( !m_bIgnoreMissingNSDecl || attributes[i + 2] != nullptr )
+        aNamespaceURI = OUString( XML_CAST( attributes[ i + 2 ] ), strlen( XML_CAST( attributes[ i + 2 ] )), RTL_TEXTENCODING_UTF8 );
+    const OString& rPrefix = OString( XML_CAST( attributes[ i + 1 ] ));
+    const OString& rLocalName = OString( XML_CAST( attributes[ i ] ));
+    OString aQualifiedName = (rPrefix.isEmpty())? rLocalName : rPrefix + ":" + rLocalName;
+    xAttributes->addUnknown( aNamespaceURI, aQualifiedName,
+        OString( XML_CAST( attributes[ i + 3 ] ), attributes[ i + 4 ] - attributes[ i + 3 ] ));
+    SAL_INFO("xmloff", "unknown element " << aQualifiedName << " " << aNamespaceURI);
+}
+
+void FastSaxParserImpl::callbackEndElement()
+{
+    if (!pendingCharacters.empty())
+        sendPendingCharacters();
+    Entity& rEntity = getEntity();
+    SAL_WARN_IF(rEntity.maNamespaceCount.empty(), "sax", "Empty NamespaceCount");
+    if( !rEntity.maNamespaceCount.empty() )
+        rEntity.maNamespaceCount.pop();
+
+    SAL_WARN_IF(rEntity.maNamespaceStack.empty(), "sax", "Empty NamespaceStack");
+    if( !rEntity.maNamespaceStack.empty() )
+        rEntity.maNamespaceStack.pop();
+
+    rEntity.getEvent( CallbackType::END_ELEMENT );
+    if (rEntity.mbEnableThreads)
+        produce();
+    else
+        rEntity.endElement();
+}
+
+void FastSaxParserImpl::callbackCharacters( const xmlChar* s, int nLen )
+{
+    // SAX interface allows that the characters callback splits content of one XML node
+    // (e.g. because there's an entity that needs decoding), however for consumers it's
+    // simpler FastSaxParser's character callback provides the whole string at once,
+    // so merge data from possible multiple calls and send them at once (before the element
+    // ends or another one starts).
+    //
+    // We use a std::vector<char> to avoid calling into the OUString constructor more than once when
+    // we have multiple callbackCharacters() calls that we have to merge, which happens surprisingly
+    // often in writer documents.
+    int nOriginalLen = pendingCharacters.size();
+    pendingCharacters.resize(nOriginalLen + nLen);
+    memcpy(pendingCharacters.data() + nOriginalLen, s, nLen);
+}
+
+void FastSaxParserImpl::sendPendingCharacters()
+{
+    Entity& rEntity = getEntity();
+    OUString sChars( pendingCharacters.data(), pendingCharacters.size(), RTL_TEXTENCODING_UTF8 );
+    if (rEntity.mbEnableThreads)
+    {
+        Event& rEvent = rEntity.getEvent( CallbackType::CHARACTERS );
+        rEvent.msChars = std::move(sChars);
+        produce();
+    }
+    else
+        rEntity.characters( sChars );
+    pendingCharacters.resize(0);
+}
+
+void FastSaxParserImpl::callbackProcessingInstruction( const xmlChar *target, const xmlChar *data )
+{
+    if (!pendingCharacters.empty())
+        sendPendingCharacters();
+    Entity& rEntity = getEntity();
+    Event& rEvent = rEntity.getEvent( CallbackType::PROCESSING_INSTRUCTION );
+
+    // This event is very rare, so no need to waste extra space for this
+    // Using namespace and element strings to be target and data in that order.
+    rEvent.msNamespace = OUString( XML_CAST( target ), strlen( XML_CAST( target ) ), RTL_TEXTENCODING_UTF8 );
+    if ( data != nullptr )
+        rEvent.msElementName = OUString( XML_CAST( data ), strlen( XML_CAST( data ) ), RTL_TEXTENCODING_UTF8 );
+    else
+        rEvent.msElementName.clear();
+
+    if (rEntity.mbEnableThreads)
+        produce();
+    else
+        rEntity.processingInstruction( rEvent.msNamespace, rEvent.msElementName );
+}
+
+xmlEntityPtr FastSaxParserImpl::callbackGetEntity( const xmlChar *name )
+{
+    if( !name )
+        return xmlGetPredefinedEntity(name);
+    const char* dname = XML_CAST(name);
+    int lname = strlen(dname);
+    if( lname == 0 )
+        return xmlGetPredefinedEntity(name);
+    if (m_Replacements.size() > 0)
+    {
+        auto it = std::lower_bound(m_Replacements.begin(), m_Replacements.end(), dname);
+        if (it != m_Replacements.end() && it->name.compareToAscii(dname) == 0)
+        {
+            xmlEntityPtr entpt = xmlNewEntity(
+                nullptr, name, XML_INTERNAL_GENERAL_ENTITY, nullptr, nullptr,
+                BAD_CAST(OUStringToOString(it->replacement, RTL_TEXTENCODING_UTF8).getStr()));
+            m_TemporalEntities.push_back(entpt);
+            return entpt;
+        }
+    }
+    if( lname < 2 )
+        return xmlGetPredefinedEntity(name);
+    if ( dname[0] == '#' )
+    {
+        sal_uInt32 cval = 0;
+        if( dname[1] == 'x' ||  dname[1] == 'X' )
+        {
+            if( lname < 3 )
+                return xmlGetPredefinedEntity(name);
+            cval = static_cast<sal_uInt32>( strtoul( dname + 2, nullptr, 16 ) );
+            if( cval == 0 )
+                return xmlGetPredefinedEntity(name);
+            OUString vname( &cval, 1 );
+            xmlEntityPtr entpt
+                = xmlNewEntity(nullptr, name, XML_INTERNAL_GENERAL_ENTITY, nullptr, nullptr,
+                               BAD_CAST(OUStringToOString(vname, RTL_TEXTENCODING_UTF8).getStr()));
+            m_TemporalEntities.push_back(entpt);
+            return entpt;
+        }
+        else
+        {
+            cval = static_cast<sal_uInt32>( strtoul( dname + 2, nullptr, 10 ) );
+            if( cval == 0 )
+                return xmlGetPredefinedEntity(name);
+            OUString vname(&cval, 1);
+            xmlEntityPtr entpt
+                = xmlNewEntity(nullptr, name, XML_INTERNAL_GENERAL_ENTITY, nullptr, nullptr,
+                               BAD_CAST(OUStringToOString(vname, RTL_TEXTENCODING_UTF8).getStr()));
+            m_TemporalEntities.push_back(entpt);
+            return entpt;
+        }
+    }
+    return xmlGetPredefinedEntity(name);
+}
+
+FastSaxParser::FastSaxParser() : mpImpl(new FastSaxParserImpl) {}
+
+FastSaxParser::~FastSaxParser()
+{
+}
+
+void SAL_CALL
+FastSaxParser::initialize(css::uno::Sequence< css::uno::Any > const& rArguments)
+{
+    if (!rArguments.hasElements())
+        return;
+
+    OUString str;
+    if ( !(rArguments[0] >>= str) )
+        throw IllegalArgumentException();
+
+    if ( str == "IgnoreMissingNSDecl" )
+        mpImpl->m_bIgnoreMissingNSDecl = true;
+    else if ( str == "DoSmeplease" )
+        ; //just ignore as this is already immune to billion laughs
+    else if ( str == "DisableThreadedParser" )
+        mpImpl->m_bDisableThreadedParser = true;
+    else
+        throw IllegalArgumentException();
+
+}
+
+void FastSaxParser::parseStream( const xml::sax::InputSource& aInputSource )
+{
+    mpImpl->parseStream(aInputSource);
+}
+
+void FastSaxParser::setFastDocumentHandler( const uno::Reference<xml::sax::XFastDocumentHandler>& Handler )
+{
+    mpImpl->setFastDocumentHandler(Handler);
+}
+
+void FastSaxParser::setTokenHandler( const uno::Reference<xml::sax::XFastTokenHandler>& Handler )
+{
+    mpImpl->setTokenHandler(Handler);
+}
+
+void FastSaxParser::registerNamespace( const OUString& NamespaceURL, sal_Int32 NamespaceToken )
+{
+    mpImpl->registerNamespace(NamespaceURL, NamespaceToken);
+}
+
+OUString FastSaxParser::getNamespaceURL( const OUString& rPrefix )
+{
+    return mpImpl->getNamespaceURL(rPrefix);
+}
+
+void FastSaxParser::setErrorHandler( const uno::Reference< xml::sax::XErrorHandler >& Handler )
+{
+    mpImpl->setErrorHandler(Handler);
+}
+
+void FastSaxParser::setEntityResolver( const uno::Reference< xml::sax::XEntityResolver >& )
+{
+    // not implemented
+}
+
+void FastSaxParser::setLocale( const lang::Locale& )
+{
+    // not implemented
+}
+
+void FastSaxParser::setNamespaceHandler( const uno::Reference< css::xml::sax::XFastNamespaceHandler >& Handler)
+{
+    mpImpl->setNamespaceHandler(Handler);
+}
+
+OUString FastSaxParser::getImplementationName()
+{
+    return "com.sun.star.comp.extensions.xml.sax.FastParser";
+}
+
+void FastSaxParser::setCustomEntityNames(
+    const ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>& replacements)
+{
+    mpImpl->setCustomEntityNames(replacements);
+}
+
+sal_Bool FastSaxParser::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+uno::Sequence<OUString> FastSaxParser::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.sax.FastParser" };
+}
+
+} // namespace sax_fastparser
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_extensions_xml_sax_FastParser_get_implementation(
+    css::uno::XComponentContext *,
+    css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new FastSaxParser);
+}
+
+// ----------------------------------------------------------
+// copy of the code in xmloff/source/core/namespace.cxx, which adds namespace aliases
+// for various dodgy namespace decls in the wild.
+
+static bool NormalizeW3URI( OUString& rName );
+static bool NormalizeOasisURN( OUString& rName );
+
+static void NormalizeURI( OUString& rName )
+{
+    // try OASIS + W3 URI normalization
+    bool bSuccess = NormalizeOasisURN( rName );
+    if( ! bSuccess )
+        NormalizeW3URI( rName );
+}
+
+constexpr OUStringLiteral XML_URI_W3_PREFIX(u"http://www.w3.org/");
+constexpr OUStringLiteral XML_URI_XFORMS_SUFFIX(u"/xforms");
+constexpr OUStringLiteral XML_N_XFORMS_1_0(u"http://www.w3.org/2002/xforms");
+constexpr OUStringLiteral XML_N_SVG(u"http://www.w3.org/2000/svg");
+constexpr OUStringLiteral XML_N_SVG_COMPAT(u"urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0");
+constexpr OUStringLiteral XML_N_FO(u"http://www.w3.org/1999/XSL/Format");
+constexpr OUStringLiteral XML_N_FO_COMPAT(u"urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0");
+constexpr OUStringLiteral XML_N_SMIL(u"http://www.w3.org/2001/SMIL20/");
+constexpr OUStringLiteral XML_N_SMIL_OLD(u"http://www.w3.org/2001/SMIL20");
+constexpr OUStringLiteral XML_N_SMIL_COMPAT(u"urn:oasis:names:tc:opendocument:xmlns:smil-compatible:1.0");
+constexpr OUStringLiteral XML_URN_OASIS_NAMES_TC(u"urn:oasis:names:tc");
+constexpr OUStringLiteral XML_XMLNS(u"xmlns");
+constexpr OUStringLiteral XML_OPENDOCUMENT(u"opendocument");
+constexpr OUStringLiteral XML_1_0(u"1.0");
+
+static bool NormalizeW3URI( OUString& rName )
+{
+    // check if URI matches:
+    // http://www.w3.org/[0-9]*/[:letter:]*
+    //                   (year)/(WG name)
+    // For the following WG/standards names:
+    // - xforms
+
+    bool bSuccess = false;
+    const OUString& sURIPrefix = XML_URI_W3_PREFIX;
+    if( rName.startsWith( sURIPrefix ) )
+    {
+        const OUString& sURISuffix = XML_URI_XFORMS_SUFFIX ;
+        sal_Int32 nCompareFrom = rName.getLength() - sURISuffix.getLength();
+        if( rName.subView( nCompareFrom ) == sURISuffix )
+        {
+            // found W3 prefix, and xforms suffix
+            rName = XML_N_XFORMS_1_0;
+            bSuccess = true;
+        }
+    }
+    return bSuccess;
+}
+
+static bool NormalizeOasisURN( OUString& rName )
+{
+    // #i38644#
+    // we exported the wrong namespace for smil, so we correct this here on load
+    // for older documents
+    if( rName == XML_N_SVG )
+    {
+        rName = XML_N_SVG_COMPAT;
+        return true;
+    }
+    else if( rName == XML_N_FO )
+    {
+        rName = XML_N_FO_COMPAT;
+        return true;
+    }
+    else if( rName == XML_N_SMIL || rName == XML_N_SMIL_OLD  )
+    {
+        rName = XML_N_SMIL_COMPAT;
+        return true;
+    }
+
+
+    // Check if URN matches
+    // :urn:oasis:names:tc:[^:]*:xmlns:[^:]*:1.[^:]*
+    //                     |---|       |---| |-----|
+    //                     TC-Id      Sub-Id Version
+
+    sal_Int32 nNameLen = rName.getLength();
+    // :urn:oasis:names:tc.*
+    const OUString& rOasisURN = XML_URN_OASIS_NAMES_TC;
+    if( !rName.startsWith( rOasisURN ) )
+        return false;
+
+    // :urn:oasis:names:tc:.*
+    sal_Int32 nPos = rOasisURN.getLength();
+    if( nPos >= nNameLen || rName[nPos] != ':' )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:.*
+    sal_Int32 nTCIdStart = nPos+1;
+    sal_Int32 nTCIdEnd = rName.indexOf( ':', nTCIdStart );
+    if( -1 == nTCIdEnd )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:xmlns.*
+    nPos = nTCIdEnd + 1;
+    std::u16string_view sTmp( rName.subView( nPos ) );
+    const OUString& rXMLNS = XML_XMLNS;
+    if( !o3tl::starts_with(sTmp, rXMLNS ) )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:xmlns:.*
+    nPos += rXMLNS.getLength();
+    if( nPos >= nNameLen || rName[nPos] != ':' )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:xmlns:[^:]*:.*
+    nPos = rName.indexOf( ':', nPos+1 );
+    if( -1 == nPos )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:xmlns:[^:]*:[^:][^:][^:][^:]*
+    sal_Int32 nVersionStart = nPos+1;
+    if( nVersionStart+2 >= nNameLen ||
+        -1 != rName.indexOf( ':', nVersionStart ) )
+        return false;
+
+    // :urn:oasis:names:tc:[^:]:xmlns:[^:]*:1\.[^:][^:]*
+    if( rName[nVersionStart] != '1' || rName[nVersionStart+1] != '.' )
+        return false;
+
+    // replace [tcid] with current TCID and version with current version.
+
+    rName = rName.subView( 0, nTCIdStart ) +
+            XML_OPENDOCUMENT +
+            rName.subView( nTCIdEnd, nVersionStart-nTCIdEnd ) +
+            XML_1_0;
+
+    return true;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/fastparser/legacyfastparser.cxx b/sax/source/fastparser/legacyfastparser.cxx
new file mode 100644
index 0000000000..e7afc55d93
--- /dev/null
+++ b/sax/source/fastparser/legacyfastparser.cxx
@@ -0,0 +1,375 @@
+/* -*- 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 <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/FastParser.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/beans/Pair.hpp>
+#include <comphelper/attributelist.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <comphelper/processfactory.hxx>
+#include <rtl/ref.hxx>
+#include <memory>
+#include <utility>
+#include <vector>
+
+using namespace ::cppu;
+using namespace css;
+using namespace uno;
+using namespace lang;
+using namespace xml::sax;
+using namespace io;
+
+namespace {
+
+class NamespaceHandler : public WeakImplHelper< XFastNamespaceHandler >
+{
+private:
+    struct NamespaceDefine
+    {
+        OUString    m_aPrefix;
+        OUString    m_aNamespaceURI;
+
+        NamespaceDefine( OUString aPrefix, OUString aNamespaceURI ) : m_aPrefix(std::move( aPrefix )), m_aNamespaceURI(std::move( aNamespaceURI )) {}
+    };
+    std::vector< std::unique_ptr< NamespaceDefine > > m_aNamespaceDefines;
+
+public:
+    NamespaceHandler();
+    void addNSDeclAttributes( rtl::Reference < comphelper::AttributeList > const & rAttrList );
+
+    //XFastNamespaceHandler
+    virtual void SAL_CALL registerNamespace( const OUString& rNamespacePrefix, const OUString& rNamespaceURI ) override;
+    virtual OUString SAL_CALL getNamespaceURI( const OUString& rNamespacePrefix ) override;
+};
+
+NamespaceHandler::NamespaceHandler()
+{
+}
+
+void NamespaceHandler::addNSDeclAttributes( rtl::Reference < comphelper::AttributeList > const & rAttrList )
+{
+    for(const auto& aNamespaceDefine : m_aNamespaceDefines)
+    {
+        OUString& rPrefix = aNamespaceDefine->m_aPrefix;
+        OUString& rNamespaceURI = aNamespaceDefine->m_aNamespaceURI;
+        OUString sDecl;
+        if ( rPrefix.isEmpty() )
+            sDecl = "xmlns";
+        else
+            sDecl = "xmlns:" + rPrefix;
+        rAttrList->AddAttribute( sDecl, rNamespaceURI );
+    }
+    m_aNamespaceDefines.clear();
+}
+
+void NamespaceHandler::registerNamespace( const OUString& rNamespacePrefix, const OUString& rNamespaceURI )
+{
+    m_aNamespaceDefines.push_back( std::make_unique<NamespaceDefine>(
+                                    rNamespacePrefix, rNamespaceURI) );
+}
+
+OUString NamespaceHandler::getNamespaceURI( const OUString&/* rNamespacePrefix */ )
+{
+    return OUString();
+}
+
+class SaxLegacyFastParser : public WeakImplHelper< XInitialization, XServiceInfo, XParser >
+{
+private:
+    rtl::Reference< NamespaceHandler > m_aNamespaceHandler;
+public:
+    SaxLegacyFastParser();
+
+// css::lang::XInitialization:
+    virtual void SAL_CALL initialize(css::uno::Sequence<css::uno::Any> const& rArguments) override;
+
+// The SAX-Parser-Interface
+    virtual void SAL_CALL parseStream(  const InputSource& structSource) override;
+    virtual void SAL_CALL setDocumentHandler(const Reference< XDocumentHandler > & xHandler) override;
+    virtual void SAL_CALL setErrorHandler(const Reference< XErrorHandler > & xHandler) override;
+    virtual void SAL_CALL setDTDHandler(const Reference < XDTDHandler > & xHandler) override;
+    virtual void SAL_CALL setEntityResolver(const Reference<  XEntityResolver >& xResolver) override;
+    virtual void SAL_CALL setLocale( const Locale &locale ) override;
+
+// XServiceInfo
+    OUString SAL_CALL getImplementationName() override;
+    Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+    sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+    Reference< XFastParser > m_xParser;
+    Reference< XDocumentHandler > m_xDocumentHandler;
+    Reference< XFastTokenHandler > m_xTokenHandler;
+
+};
+
+
+class CallbackDocumentHandler : public WeakImplHelper< XFastDocumentHandler >
+{
+private:
+    Reference< XDocumentHandler > m_xDocumentHandler;
+    Reference< XFastTokenHandler > m_xTokenHandler;
+    rtl::Reference< NamespaceHandler > m_aNamespaceHandler;
+    OUString getNamespacePrefixFromToken( sal_Int32 nToken );
+    OUString getNameFromToken( sal_Int32 nToken );
+
+    static constexpr OUString aDefaultNamespace = u""_ustr;
+    static constexpr OUString aNamespaceSeparator = u":"_ustr;
+
+public:
+    CallbackDocumentHandler( Reference< XDocumentHandler > const & xDocumentHandler,
+                             rtl::Reference< NamespaceHandler > const & rNamespaceHandler,
+                             Reference< XFastTokenHandler > const & xTokenHandler);
+
+    // XFastDocumentHandler
+    virtual void SAL_CALL startDocument() override;
+    virtual void SAL_CALL endDocument() override;
+    virtual void SAL_CALL processingInstruction( const OUString& rTarget, const OUString& rData ) override;
+    virtual void SAL_CALL setDocumentLocator( const Reference< XLocator >& xLocator ) override;
+
+    // XFastContextHandler
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement, const Reference< XFastAttributeList >& Attribs ) override;
+    virtual void SAL_CALL startUnknownElement( const OUString& Namespace, const OUString& Name, const Reference< XFastAttributeList >& Attribs ) override;
+    virtual void SAL_CALL endFastElement( sal_Int32 Element ) override;
+    virtual void SAL_CALL endUnknownElement( const OUString& Namespace, const OUString& Name ) override;
+    virtual Reference< XFastContextHandler > SAL_CALL createFastChildContext( sal_Int32 nElement, const Reference< XFastAttributeList >& Attribs ) override;
+    virtual Reference< XFastContextHandler > SAL_CALL createUnknownChildContext( const OUString& Namespace, const OUString& Name, const Reference< XFastAttributeList >& Attribs ) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+};
+
+OUString CallbackDocumentHandler::getNamespacePrefixFromToken( sal_Int32 nToken )
+{
+    if ( ( nToken & 0xffff0000 ) != 0 )
+    {
+        Sequence< sal_Int8 > aSeq = m_xTokenHandler->getUTF8Identifier( nToken & 0xffff0000 );
+        return OUString( reinterpret_cast< const char* >(
+                        aSeq.getConstArray() ), aSeq.getLength(), RTL_TEXTENCODING_UTF8 );
+    }
+    else
+        return OUString();
+}
+
+OUString CallbackDocumentHandler::getNameFromToken( sal_Int32 nToken )
+{
+    Sequence< sal_Int8 > aSeq = m_xTokenHandler->getUTF8Identifier( nToken & 0xffff );
+    return OUString( reinterpret_cast< const char* >(
+                    aSeq.getConstArray() ), aSeq.getLength(), RTL_TEXTENCODING_UTF8 );
+}
+
+CallbackDocumentHandler::CallbackDocumentHandler( Reference< XDocumentHandler > const & xDocumentHandler,
+                                                  rtl::Reference< NamespaceHandler > const & rNamespaceHandler,
+                                                  Reference< XFastTokenHandler > const & xTokenHandler)
+{
+   m_xDocumentHandler.set( xDocumentHandler );
+   m_aNamespaceHandler = rNamespaceHandler;
+   m_xTokenHandler.set( xTokenHandler );
+}
+
+void SAL_CALL CallbackDocumentHandler::startDocument()
+{
+    if ( m_xDocumentHandler.is() )
+        m_xDocumentHandler->startDocument();
+}
+
+void SAL_CALL CallbackDocumentHandler::endDocument()
+{
+    if ( m_xDocumentHandler.is() )
+        m_xDocumentHandler->endDocument();
+}
+
+void SAL_CALL CallbackDocumentHandler::processingInstruction( const OUString& rTarget, const OUString& rData )
+{
+    if ( m_xDocumentHandler.is() )
+        m_xDocumentHandler->processingInstruction( rTarget, rData );
+}
+
+void SAL_CALL CallbackDocumentHandler::setDocumentLocator( const Reference< XLocator >& xLocator )
+{
+    if ( m_xDocumentHandler.is() )
+        m_xDocumentHandler->setDocumentLocator( xLocator );
+}
+
+void SAL_CALL CallbackDocumentHandler::startFastElement( sal_Int32 nElement , const Reference< XFastAttributeList >& Attribs  )
+{
+    const OUString& rPrefix = CallbackDocumentHandler::getNamespacePrefixFromToken( nElement );
+    const OUString& rLocalName = CallbackDocumentHandler::getNameFromToken( nElement );
+    startUnknownElement( aDefaultNamespace, (rPrefix.isEmpty())? rLocalName : rPrefix + aNamespaceSeparator + rLocalName, Attribs );
+}
+
+void SAL_CALL CallbackDocumentHandler::startUnknownElement( const OUString& /*Namespace*/, const OUString& Name, const Reference< XFastAttributeList >& Attribs  )
+{
+    if ( !m_xDocumentHandler.is() )
+        return;
+
+    rtl::Reference < comphelper::AttributeList > rAttrList = new comphelper::AttributeList;
+    m_aNamespaceHandler->addNSDeclAttributes( rAttrList );
+
+    const Sequence< xml::FastAttribute > fastAttribs = Attribs->getFastAttributes();
+    for (const auto& rAttr : fastAttribs)
+    {
+        const OUString& rAttrValue = rAttr.Value;
+        sal_Int32 nToken = rAttr.Token;
+        const OUString& rAttrNamespacePrefix = CallbackDocumentHandler::getNamespacePrefixFromToken( nToken );
+        OUString sAttrName = CallbackDocumentHandler::getNameFromToken( nToken );
+        if ( !rAttrNamespacePrefix.isEmpty() )
+            sAttrName = rAttrNamespacePrefix + aNamespaceSeparator + sAttrName;
+
+        rAttrList->AddAttribute( sAttrName, rAttrValue );
+    }
+
+    const Sequence< xml::Attribute > unknownAttribs = Attribs->getUnknownAttributes();
+    for (const auto& rAttr : unknownAttribs)
+    {
+        const OUString& rAttrValue = rAttr.Value;
+        const OUString& rAttrName = rAttr.Name;
+
+        rAttrList->AddAttribute( rAttrName, rAttrValue );
+    }
+    m_xDocumentHandler->startElement( Name, rAttrList );
+}
+
+void SAL_CALL CallbackDocumentHandler::endFastElement( sal_Int32 nElement )
+{
+    const OUString& rPrefix = CallbackDocumentHandler::getNamespacePrefixFromToken( nElement );
+    const OUString& rLocalName = CallbackDocumentHandler::getNameFromToken( nElement );
+    endUnknownElement( aDefaultNamespace, (rPrefix.isEmpty())? rLocalName : rPrefix + aNamespaceSeparator + rLocalName );
+}
+
+
+void SAL_CALL CallbackDocumentHandler::endUnknownElement( const OUString& /*Namespace*/, const OUString& Name )
+{
+    if ( m_xDocumentHandler.is() )
+    {
+        m_xDocumentHandler->endElement( Name );
+    }
+}
+
+Reference< XFastContextHandler > SAL_CALL CallbackDocumentHandler::createFastChildContext( sal_Int32/* nElement */, const Reference< XFastAttributeList >&/* Attribs */ )
+{
+    return this;
+}
+
+
+Reference< XFastContextHandler > SAL_CALL CallbackDocumentHandler::createUnknownChildContext( const OUString&/* Namespace */, const OUString&/* Name */, const Reference< XFastAttributeList >&/* Attribs */ )
+{
+    return this;
+}
+
+void SAL_CALL CallbackDocumentHandler::characters( const OUString& aChars )
+{
+    if ( m_xDocumentHandler.is() )
+        m_xDocumentHandler->characters( aChars );
+}
+
+SaxLegacyFastParser::SaxLegacyFastParser( ) : m_aNamespaceHandler( new NamespaceHandler ),
+  m_xParser(FastParser::create(::comphelper::getProcessComponentContext() ))
+{
+    m_xParser->setNamespaceHandler( m_aNamespaceHandler );
+}
+
+void SAL_CALL SaxLegacyFastParser::initialize(Sequence< Any > const& rArguments )
+{
+    if (!rArguments.hasElements())
+        return;
+
+    Reference< XFastTokenHandler > xTokenHandler;
+    OUString str;
+    if ( ( rArguments[0] >>= xTokenHandler ) && xTokenHandler.is() )
+    {
+        m_xTokenHandler.set( xTokenHandler );
+    }
+    else if ( ( rArguments[0] >>= str ) && "registerNamespaces" == str )
+    {
+        css::beans::Pair< OUString, sal_Int32 > rPair;
+        for (sal_Int32 i = 1; i < rArguments.getLength(); i++ )
+        {
+            rArguments[i] >>= rPair;
+            m_xParser->registerNamespace( rPair.First, rPair.Second );
+        }
+    }
+    else
+    {
+        uno::Reference<lang::XInitialization> const xInit(m_xParser,
+                        uno::UNO_QUERY_THROW);
+        xInit->initialize( rArguments );
+    }
+}
+
+void SaxLegacyFastParser::parseStream( const InputSource& structSource )
+{
+    m_xParser->setFastDocumentHandler( new CallbackDocumentHandler( m_xDocumentHandler,
+                                       m_aNamespaceHandler, m_xTokenHandler ) );
+    m_xParser->setTokenHandler( m_xTokenHandler );
+    m_xParser->parseStream( structSource );
+}
+
+void SaxLegacyFastParser::setDocumentHandler( const Reference< XDocumentHandler > & xHandler )
+{
+    m_xDocumentHandler = xHandler;
+}
+
+void SaxLegacyFastParser::setErrorHandler( const Reference< XErrorHandler > & xHandler )
+{
+    m_xParser->setErrorHandler( xHandler );
+}
+
+void SaxLegacyFastParser::setDTDHandler( const Reference < XDTDHandler > &/* xHandler */ )
+{
+
+}
+
+void SaxLegacyFastParser::setEntityResolver( const Reference<  XEntityResolver >& xResolver )
+{
+    m_xParser->setEntityResolver( xResolver );
+}
+
+void SaxLegacyFastParser::setLocale( const Locale &locale )
+{
+    m_xParser->setLocale( locale );
+}
+
+OUString SaxLegacyFastParser::getImplementationName()
+{
+    return "com.sun.star.comp.extensions.xml.sax.LegacyFastParser";
+}
+
+sal_Bool SaxLegacyFastParser::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > SaxLegacyFastParser::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.sax.LegacyFastParser" };
+}
+
+} //namespace
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_extensions_xml_sax_LegacyFastParser_get_implementation(
+    css::uno::XComponentContext *,
+    css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new SaxLegacyFastParser);
+}
+
+ /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/CachedOutputStream.hxx b/sax/source/tools/CachedOutputStream.hxx
new file mode 100644
index 0000000000..7d9e514c34
--- /dev/null
+++ b/sax/source/tools/CachedOutputStream.hxx
@@ -0,0 +1,118 @@
+/* -*- 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/.
+ */
+
+#ifndef INCLUDED_SAX_SOURCE_TOOLS_CACHEDOUTPUTSTREAM_HXX
+#define INCLUDED_SAX_SOURCE_TOOLS_CACHEDOUTPUTSTREAM_HXX
+
+#include <sal/types.h>
+
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <cstring>
+#include <memory>
+
+namespace sax_fastparser {
+
+class ForMergeBase
+{
+public:
+    virtual ~ForMergeBase() {}
+    virtual void append( const css::uno::Sequence<sal_Int8>& rWhat ) = 0;
+};
+
+class CachedOutputStream
+{
+    /// When buffer hits this size, it's written to mxOutputStream
+    static const sal_Int32 mnMaximumSize = 0x100000; // 1Mbyte
+
+    /// ForMerge structure is used for sorting elements in Writer
+    std::shared_ptr< ForMergeBase > mpForMerge;
+    const css::uno::Sequence<sal_Int8> mpCache;
+    /// Output stream, usually writing data into files.
+    css::uno::Reference< css::io::XOutputStream > mxOutputStream;
+    uno_Sequence *pSeq;
+    sal_Int32 mnCacheWrittenSize;
+    bool mbWriteToOutStream;
+
+public:
+    CachedOutputStream() : mpCache(mnMaximumSize)
+                         , pSeq(mpCache.get())
+                         , mnCacheWrittenSize(0)
+                         , mbWriteToOutStream(true)
+    {}
+
+    const css::uno::Reference< css::io::XOutputStream >& getOutputStream() const
+    {
+        return mxOutputStream;
+    }
+
+    void setOutputStream( const css::uno::Reference< css::io::XOutputStream >& xOutputStream )
+    {
+        mxOutputStream = xOutputStream;
+    }
+
+    void setOutput( std::shared_ptr< ForMergeBase > pForMerge )
+    {
+        flush();
+        mbWriteToOutStream = false;
+        mpForMerge = pForMerge;
+    }
+
+    void resetOutputToStream()
+    {
+        flush();
+        mbWriteToOutStream = true;
+        mpForMerge.reset();
+    }
+
+    /// cache string and if limit is hit, flush
+    void writeBytes( const sal_Int8* pStr, sal_Int32 nLen )
+    {
+        // Write when the buffer gets big enough
+        if (mnCacheWrittenSize + nLen > mnMaximumSize)
+        {
+            flush();
+
+            // Writer does some elements sorting, so it can accumulate
+            // pretty big strings in FastSaxSerializer::ForMerge.
+            // In that case, just flush data and write immediately.
+            if (nLen > mnMaximumSize)
+            {
+                if (mbWriteToOutStream)
+                    mxOutputStream->writeBytes( css::uno::Sequence<sal_Int8>(pStr, nLen) );
+                else
+                    mpForMerge->append( css::uno::Sequence<sal_Int8>(pStr, nLen) );
+                return;
+            }
+        }
+
+        memcpy(pSeq->elements + mnCacheWrittenSize, pStr, nLen);
+        mnCacheWrittenSize += nLen;
+    }
+
+    /// immediately write buffer into mxOutputStream and clear
+    void flush()
+    {
+        // resize the Sequence to written size
+        pSeq->nElements = mnCacheWrittenSize;
+        if (mbWriteToOutStream)
+            mxOutputStream->writeBytes( mpCache );
+        else
+            mpForMerge->append( mpCache );
+        // and next time write to the beginning
+        mnCacheWrittenSize = 0;
+    }
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/converter.cxx b/sax/source/tools/converter.cxx
new file mode 100644
index 0000000000..818d04a9bd
--- /dev/null
+++ b/sax/source/tools/converter.cxx
@@ -0,0 +1,2360 @@
+/* -*- 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 <sax/tools/converter.hxx>
+
+#include <com/sun/star/i18n/UnicodeType.hpp>
+#include <com/sun/star/util/DateTime.hpp>
+#include <com/sun/star/util/Date.hpp>
+#include <com/sun/star/util/Duration.hpp>
+#include <com/sun/star/util/Time.hpp>
+#include <optional>
+
+#include <rtl/ustrbuf.hxx>
+#include <rtl/math.hxx>
+#include <rtl/character.hxx>
+#include <sal/log.hxx>
+#include <o3tl/string_view.hxx>
+#include <o3tl/typed_flags_set.hxx>
+#include <o3tl/unit_conversion.hxx>
+#include <osl/diagnose.h>
+#include <tools/long.hxx>
+
+#include <algorithm>
+#include <string_view>
+
+using namespace com::sun::star;
+using namespace com::sun::star::uno;
+using namespace com::sun::star::util;
+using namespace ::com::sun::star::i18n;
+
+
+namespace sax {
+
+const std::string_view gpsMM = "mm";
+const std::string_view gpsCM = "cm";
+const std::string_view gpsPT = "pt";
+const std::string_view gpsINCH = "in";
+const std::string_view gpsPC = "pc";
+
+const sal_Int8 XML_MAXDIGITSCOUNT_TIME = 14;
+
+static sal_Int64 toInt64_WithLength(const sal_Unicode * str, sal_Int16 radix, sal_Int32 nStrLength )
+{
+    return rtl_ustr_toInt64_WithLength(str, radix, nStrLength);
+}
+static sal_Int64 toInt64_WithLength(const char * str, sal_Int16 radix, sal_Int32 nStrLength )
+{
+    return rtl_str_toInt64_WithLength(str, radix, nStrLength);
+}
+
+namespace
+{
+o3tl::Length Measure2O3tlUnit(sal_Int16 nUnit)
+{
+    switch (nUnit)
+    {
+        case MeasureUnit::TWIP:
+            return o3tl::Length::twip;
+        case MeasureUnit::POINT:
+            return o3tl::Length::pt;
+        case MeasureUnit::MM_10TH:
+            return o3tl::Length::mm10;
+        case MeasureUnit::MM_100TH:
+            return o3tl::Length::mm100;
+        case MeasureUnit::MM:
+            return o3tl::Length::mm;
+        case MeasureUnit::CM:
+            return o3tl::Length::cm;
+        default:
+            SAL_WARN("sax", "unit not supported for length");
+            [[fallthrough]];
+        case MeasureUnit::INCH:
+            return o3tl::Length::in;
+    }
+}
+
+std::string_view Measure2UnitString(sal_Int16 nUnit)
+{
+    switch (nUnit)
+    {
+        case MeasureUnit::TWIP:
+            return gpsPC; // ??
+        case MeasureUnit::POINT:
+            return gpsPT;
+        case MeasureUnit::MM_10TH:
+        case MeasureUnit::MM_100TH:
+            return {};
+        case MeasureUnit::MM:
+            return gpsMM;
+        case MeasureUnit::CM:
+            return gpsCM;
+        case MeasureUnit::INCH:
+        default:
+            return gpsINCH;
+    }
+}
+
+template <typename V> bool wordEndsWith(V string, std::string_view expected)
+{
+    V substr = string.substr(0, expected.size());
+    return std::equal(substr.begin(), substr.end(), expected.begin(), expected.end(),
+                      [](sal_uInt32 c1, sal_uInt32 c2) { return rtl::toAsciiLowerCase(c1) == c2; })
+           && (string.size() == expected.size() || string[expected.size()] == ' ');
+}
+
+}
+
+/** convert string to measure using optional min and max values*/
+template<typename V>
+static bool lcl_convertMeasure( sal_Int32& rValue,
+                                V rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    bool bNeg = false;
+    double nVal = 0;
+
+    sal_Int32 nPos = 0;
+    sal_Int32 const nLen = rString.size();
+
+    // skip white space
+    while( (nPos < nLen) && (rString[nPos] <= ' ') )
+        nPos++;
+
+    if( nPos < nLen && '-' == rString[nPos] )
+    {
+        bNeg = true;
+        nPos++;
+    }
+
+    // get number
+    while( nPos < nLen &&
+           '0' <= rString[nPos] &&
+           '9' >= rString[nPos] )
+    {
+        // TODO: check overflow!
+        nVal *= 10;
+        nVal += (rString[nPos] - '0');
+        nPos++;
+    }
+    if( nPos < nLen && '.' == rString[nPos] )
+    {
+        nPos++;
+        double nDiv = 1.;
+
+        while( nPos < nLen &&
+               '0' <= rString[nPos] &&
+               '9' >= rString[nPos] )
+        {
+            // TODO: check overflow!
+            nDiv *= 10;
+            nVal += ( static_cast<double>(rString[nPos] - '0') / nDiv );
+            nPos++;
+        }
+    }
+
+    // skip white space
+    while( (nPos < nLen) && (rString[nPos] <= ' ') )
+        nPos++;
+
+    if( nPos < nLen )
+    {
+
+        if( MeasureUnit::PERCENT == nTargetUnit )
+        {
+            if( '%' != rString[nPos] )
+                return false;
+        }
+        else if( MeasureUnit::PIXEL == nTargetUnit )
+        {
+            if( nPos + 1 >= nLen ||
+                ('p' != rString[nPos] &&
+                 'P' != rString[nPos])||
+                ('x' != rString[nPos+1] &&
+                 'X' != rString[nPos+1]) )
+                return false;
+        }
+        else
+        {
+            OSL_ENSURE( MeasureUnit::TWIP == nTargetUnit || MeasureUnit::POINT == nTargetUnit ||
+                        MeasureUnit::MM_100TH == nTargetUnit || MeasureUnit::MM_10TH == nTargetUnit ||
+                        MeasureUnit::PIXEL == nTargetUnit, "unit is not supported");
+
+            o3tl::Length eFrom = o3tl::Length::invalid;
+
+            if( MeasureUnit::TWIP == nTargetUnit )
+            {
+                switch (rtl::toAsciiLowerCase<sal_uInt32>(rString[nPos]))
+                {
+                case u'c':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::cm;
+                    break;
+                case u'i':
+                    if (wordEndsWith(rString.substr(nPos + 1), "n"))
+                        eFrom = o3tl::Length::in;
+                    break;
+                case u'm':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::mm;
+                    break;
+                case u'p':
+                    if (wordEndsWith(rString.substr(nPos + 1), "t"))
+                        eFrom = o3tl::Length::pt;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "c"))
+                        eFrom = o3tl::Length::pc;
+                    break;
+                }
+            }
+            else if( MeasureUnit::MM_100TH == nTargetUnit || MeasureUnit::MM_10TH == nTargetUnit )
+            {
+                switch (rtl::toAsciiLowerCase<sal_uInt32>(rString[nPos]))
+                {
+                case u'c':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::cm;
+                    break;
+                case u'i':
+                    if (wordEndsWith(rString.substr(nPos + 1), "n"))
+                        eFrom = o3tl::Length::in;
+                    break;
+                case u'm':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::mm;
+                    break;
+                case u'p':
+                    if (wordEndsWith(rString.substr(nPos + 1), "t"))
+                        eFrom = o3tl::Length::pt;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "c"))
+                        eFrom = o3tl::Length::pc;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "x"))
+                        eFrom = o3tl::Length::px;
+                    break;
+                }
+            }
+            else if( MeasureUnit::POINT == nTargetUnit )
+            {
+                if (wordEndsWith(rString.substr(nPos), "pt"))
+                    eFrom = o3tl::Length::pt;
+            }
+
+            if (eFrom == o3tl::Length::invalid)
+                return false;
+
+            // TODO: check overflow
+            nVal = o3tl::convert(nVal, eFrom, Measure2O3tlUnit(nTargetUnit));
+        }
+    }
+
+    nVal += .5;
+    if( bNeg )
+        nVal = -nVal;
+
+    if( nVal <= static_cast<double>(nMin) )
+        rValue = nMin;
+    else if( nVal >= static_cast<double>(nMax) )
+        rValue = nMax;
+    else
+        rValue = static_cast<sal_Int32>(nVal);
+
+    return true;
+}
+
+/** convert string to measure using optional min and max values*/
+bool Converter::convertMeasure( sal_Int32& rValue,
+                                std::u16string_view rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
+}
+
+/** convert string to measure using optional min and max values*/
+bool Converter::convertMeasure( sal_Int32& rValue,
+                                std::string_view rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
+}
+
+
+/** convert measure in given unit to string with given unit */
+void Converter::convertMeasure( OUStringBuffer& rBuffer,
+                                sal_Int32 nMeasure,
+                                sal_Int16 nSourceUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::INCH */  )
+{
+    if( nSourceUnit == MeasureUnit::PERCENT )
+    {
+        OSL_ENSURE( nTargetUnit == MeasureUnit::PERCENT,
+                    "MeasureUnit::PERCENT only maps to MeasureUnit::PERCENT!" );
+
+        rBuffer.append( nMeasure );
+        rBuffer.append( '%' );
+
+        return;
+    }
+    sal_Int64 nValue(nMeasure); // extend to 64-bit first to avoid overflow
+    // the sign is processed separately
+    if (nValue < 0)
+    {
+        nValue = -nValue;
+        rBuffer.append( '-' );
+    }
+
+    o3tl::Length eFrom = o3tl::Length::in, eTo = o3tl::Length::in;
+    int nFac = 100; // used to get specific number of decimals (2 by default)
+    std::string_view psUnit;
+    switch( nSourceUnit )
+    {
+    case MeasureUnit::TWIP:
+        eFrom = o3tl::Length::twip;
+        switch( nTargetUnit )
+        {
+        case MeasureUnit::MM_100TH:
+        case MeasureUnit::MM_10TH:
+            OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,"output unit not supported for twip values" );
+            [[fallthrough]];
+        case MeasureUnit::MM:
+            eTo = o3tl::Length::mm;
+            nFac = 100;
+            psUnit = gpsMM;
+            break;
+
+        case MeasureUnit::CM:
+            eTo = o3tl::Length::cm;
+            nFac = 1000;
+            psUnit = gpsCM;
+            break;
+
+        case MeasureUnit::POINT:
+            eTo = o3tl::Length::pt;
+            nFac = 100;
+            psUnit = gpsPT;
+            break;
+
+        case MeasureUnit::INCH:
+        default:
+            OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                        "output unit not supported for twip values" );
+            nFac = 10000;
+            psUnit = gpsINCH;
+            break;
+        }
+        break;
+
+    case MeasureUnit::POINT:
+        // 1pt = 1pt (exactly)
+        OSL_ENSURE( MeasureUnit::POINT == nTargetUnit,
+                    "output unit not supported for pt values" );
+        eFrom = eTo = o3tl::Length::pt;
+        nFac = 1;
+        psUnit = gpsPT;
+        break;
+    case MeasureUnit::MM_10TH:
+    case MeasureUnit::MM_100TH:
+        {
+            int nFac2 = (MeasureUnit::MM_100TH == nSourceUnit) ? 100 : 10;
+            eFrom = Measure2O3tlUnit(nSourceUnit);
+            switch( nTargetUnit )
+            {
+            case MeasureUnit::MM_100TH:
+            case MeasureUnit::MM_10TH:
+                OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                            "output unit not supported for 1/100mm values" );
+                [[fallthrough]];
+            case MeasureUnit::MM:
+                eTo = o3tl::Length::mm;
+                nFac = nFac2;
+                psUnit = gpsMM;
+                break;
+
+            case MeasureUnit::CM:
+                eTo = o3tl::Length::cm;
+                nFac = 10*nFac2;
+                psUnit = gpsCM;
+                break;
+
+            case MeasureUnit::POINT:
+                eTo = o3tl::Length::pt;
+                nFac = nFac2;
+                psUnit = gpsPT;
+                break;
+
+            case MeasureUnit::INCH:
+            default:
+                OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                            "output unit not supported for 1/100mm values" );
+                nFac = 100*nFac2;
+                psUnit = gpsINCH;
+                break;
+            }
+            break;
+        }
+    default:
+        OSL_ENSURE(false, "sax::Converter::convertMeasure(): "
+                "source unit not supported");
+        break;
+    }
+
+    nValue = o3tl::convert(nValue * nFac, eFrom, eTo);
+
+    rBuffer.append( static_cast<sal_Int64>(nValue / nFac) );
+    if (nFac > 1 && (nValue % nFac) != 0)
+    {
+        rBuffer.append( '.' );
+        while (nFac > 1 && (nValue % nFac) != 0)
+        {
+            nFac /= 10;
+            rBuffer.append( static_cast<sal_Int32>((nValue / nFac) % 10) );
+        }
+    }
+
+    if (psUnit.length() > 0)
+        rBuffer.appendAscii(psUnit.data(), psUnit.length());
+}
+
+/** convert string to boolean */
+bool Converter::convertBool( bool& rBool, std::u16string_view rString )
+{
+    rBool = rString == u"true";
+
+    return rBool || (rString == u"false");
+}
+
+/** convert string to boolean */
+bool Converter::convertBool( bool& rBool, std::string_view rString )
+{
+    rBool = rString == "true";
+
+    return rBool || (rString == "false");
+}
+
+/** convert boolean to string */
+void Converter::convertBool( OUStringBuffer& rBuffer, bool bValue )
+{
+    rBuffer.append( bValue );
+}
+
+/** convert string to percent */
+bool Converter::convertPercent( sal_Int32& rPercent, std::u16string_view rString )
+{
+    return convertMeasure( rPercent, rString, MeasureUnit::PERCENT );
+}
+
+/** convert string to percent */
+bool Converter::convertPercent( sal_Int32& rPercent, std::string_view rString )
+{
+    return convertMeasure( rPercent, rString, MeasureUnit::PERCENT );
+}
+
+/** convert percent to string */
+void Converter::convertPercent( OUStringBuffer& rBuffer, sal_Int32 nValue )
+{
+    rBuffer.append( nValue );
+    rBuffer.append( '%' );
+}
+
+/** convert string to pixel measure */
+bool Converter::convertMeasurePx( sal_Int32& rPixel, std::u16string_view rString )
+{
+    return convertMeasure( rPixel, rString, MeasureUnit::PIXEL );
+}
+
+/** convert string to pixel measure */
+bool Converter::convertMeasurePx( sal_Int32& rPixel, std::string_view rString )
+{
+    return convertMeasure( rPixel, rString, MeasureUnit::PIXEL );
+}
+
+/** convert pixel measure to string */
+void Converter::convertMeasurePx( OUStringBuffer& rBuffer, sal_Int32 nValue )
+{
+    rBuffer.append( nValue );
+    rBuffer.append( 'p' );
+    rBuffer.append( 'x' );
+}
+
+static int lcl_gethex( int nChar )
+{
+    if( nChar >= '0' && nChar <= '9' )
+        return nChar - '0';
+    else if( nChar >= 'a' && nChar <= 'f' )
+        return nChar - 'a' + 10;
+    else if( nChar >= 'A' && nChar <= 'F' )
+        return nChar - 'A' + 10;
+    else
+        return 0;
+}
+
+/** convert string to rgb color */
+template<typename V>
+static bool lcl_convertColor( sal_Int32& rColor, V rValue )
+{
+    if( rValue.size() != 7 || rValue[0] != '#' )
+        return false;
+
+    rColor = lcl_gethex( rValue[1] ) * 16 + lcl_gethex( rValue[2] );
+    rColor <<= 8;
+
+    rColor |= lcl_gethex( rValue[3] ) * 16 + lcl_gethex( rValue[4] );
+    rColor <<= 8;
+
+    rColor |= lcl_gethex( rValue[5] ) * 16 + lcl_gethex( rValue[6] );
+
+    return true;
+}
+
+/** convert string to rgb color */
+bool Converter::convertColor( sal_Int32& rColor, std::u16string_view rValue )
+{
+    return lcl_convertColor(rColor, rValue);
+}
+
+/** convert string to rgb color */
+bool Converter::convertColor( sal_Int32& rColor, std::string_view rValue )
+{
+    return lcl_convertColor(rColor, rValue);
+}
+
+const char aHexTab[] = "0123456789abcdef";
+
+/** convert color to string */
+void Converter::convertColor( OUStringBuffer& rBuffer, sal_Int32 nColor )
+{
+    rBuffer.append( '#' );
+
+    sal_uInt8 nCol = static_cast<sal_uInt8>(nColor >> 16);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+
+    nCol = static_cast<sal_uInt8>(nColor >> 8);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+
+    nCol = static_cast<sal_uInt8>(nColor);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+}
+
+/** convert string to number with optional min and max values */
+bool Converter::convertNumber(  sal_Int32& rValue,
+                                std::u16string_view aString,
+                                sal_Int32 nMin, sal_Int32 nMax )
+{
+    rValue = 0;
+    sal_Int64 nNumber = 0;
+    bool bRet = convertNumber64(nNumber,aString,nMin,nMax);
+    if ( bRet )
+        rValue = static_cast<sal_Int32>(nNumber);
+    return bRet;
+}
+
+/** convert string to number with optional min and max values */
+bool Converter::convertNumber(  sal_Int32& rValue,
+                                std::string_view aString,
+                                sal_Int32 nMin, sal_Int32 nMax )
+{
+    rValue = 0;
+    sal_Int64 nNumber = 0;
+    bool bRet = convertNumber64(nNumber,aString,nMin,nMax);
+    if ( bRet )
+        rValue = static_cast<sal_Int32>(nNumber);
+    return bRet;
+}
+
+/** convert string to 64-bit number with optional min and max values */
+template<typename V>
+static bool lcl_convertNumber64( sal_Int64& rValue,
+                                 V aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    sal_Int32 nPos = 0;
+    sal_Int32 const nLen = aString.size();
+
+    // skip white space
+    while( (nPos < nLen) && (aString[nPos] <= ' ') )
+        nPos++;
+
+    sal_Int32 nNumberStartPos = nPos;
+
+    if( nPos < nLen && '-' == aString[nPos] )
+    {
+        nPos++;
+    }
+
+    // get number
+    while( nPos < nLen &&
+           '0' <= aString[nPos] &&
+           '9' >= aString[nPos] )
+    {
+        nPos++;
+    }
+
+    rValue = toInt64_WithLength(aString.data() + nNumberStartPos, 10, nPos - nNumberStartPos);
+
+    if( rValue < nMin )
+        rValue = nMin;
+    else if( rValue > nMax )
+        rValue = nMax;
+
+    return ( nPos == nLen && rValue >= nMin && rValue <= nMax );
+}
+
+/** convert string to 64-bit number with optional min and max values */
+bool Converter::convertNumber64( sal_Int64& rValue,
+                                 std::u16string_view aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
+}
+
+/** convert string to 64-bit number with optional min and max values */
+bool Converter::convertNumber64( sal_Int64& rValue,
+                                 std::string_view aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
+}
+
+
+/** convert double number to string (using ::rtl::math) */
+void Converter::convertDouble(  OUStringBuffer& rBuffer,
+                                double fNumber,
+                                bool bWriteUnits,
+                                sal_Int16 nSourceUnit,
+                                sal_Int16 nTargetUnit)
+{
+    if(MeasureUnit::PERCENT == nSourceUnit)
+    {
+        OSL_ENSURE( nTargetUnit == MeasureUnit::PERCENT, "MeasureUnit::PERCENT only maps to MeasureUnit::PERCENT!" );
+        ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+        if(bWriteUnits)
+            rBuffer.append('%');
+    }
+    else
+    {
+        OUStringBuffer sUnit;
+        double fFactor = GetConversionFactor(sUnit, nSourceUnit, nTargetUnit);
+        if(fFactor != 1.0)
+            fNumber *= fFactor;
+        ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+        if(bWriteUnits)
+            rBuffer.append(sUnit);
+    }
+}
+
+/** convert double number to string (using ::rtl::math) */
+void Converter::convertDouble( OUStringBuffer& rBuffer, double fNumber)
+{
+    ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue,
+    std::u16string_view rString, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    if (!convertDouble(rValue, rString))
+        return false;
+
+    OUStringBuffer sUnit;
+    // fdo#48969: switch source and target because factor is used to divide!
+    double const fFactor =
+        GetConversionFactor(sUnit, nTargetUnit, nSourceUnit);
+    if(fFactor != 1.0 && fFactor != 0.0)
+        rValue /= fFactor;
+    return true;
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue,
+    std::string_view rString, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    if (!convertDouble(rValue, rString))
+        return false;
+
+    OStringBuffer sUnit;
+    // fdo#48969: switch source and target because factor is used to divide!
+    double const fFactor =
+        GetConversionFactor(sUnit, nTargetUnit, nSourceUnit);
+    if(fFactor != 1.0 && fFactor != 0.0)
+        rValue /= fFactor;
+    return true;
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue, std::u16string_view rString)
+{
+    rtl_math_ConversionStatus eStatus;
+    rValue = rtl_math_uStringToDouble(rString.data(),
+                                     rString.data() + rString.size(),
+                                     /*cDecSeparator*/'.', /*cGroupSeparator*/',',
+                                     &eStatus, nullptr);
+    return ( eStatus == rtl_math_ConversionStatus_Ok );
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue, std::string_view rString)
+{
+    rtl_math_ConversionStatus eStatus;
+    rValue = rtl_math_stringToDouble(rString.data(),
+                                     rString.data() + rString.size(),
+                                     /*cDecSeparator*/'.', /*cGroupSeparator*/',',
+                                     &eStatus, nullptr);
+    return ( eStatus == rtl_math_ConversionStatus_Ok );
+}
+
+/** convert number, 10th of degrees with range [0..3600] to SVG angle */
+void Converter::convertAngle(OUStringBuffer& rBuffer, sal_Int16 const nAngle,
+        SvtSaveOptions::ODFSaneDefaultVersion const nVersion)
+{
+    if (nVersion < SvtSaveOptions::ODFSVER_012 || nVersion == SvtSaveOptions::ODFSVER_012_EXT_COMPAT)
+    {
+        // wrong, but backward compatible with OOo/LO < 4.4
+        rBuffer.append(static_cast<sal_Int32>(nAngle));
+    }
+    else
+    { // OFFICE-3774 tdf#89475 write valid ODF 1.2 angle; needs LO 4.4 to import
+        double fAngle(double(nAngle) / 10.0);
+        ::sax::Converter::convertDouble(rBuffer, fAngle);
+        rBuffer.append("deg");
+    }
+}
+
+/** convert SVG angle to number, 10th of degrees with range [0..3600] */
+bool Converter::convertAngle(sal_Int16& rAngle, std::u16string_view rString,
+        bool const isWrongOOo10thDegAngle)
+{
+    // ODF 1.1 leaves it undefined what the number means, but ODF 1.2 says it's
+    // degrees, while OOo has historically used 10th of degrees :(
+    // So import degrees when we see the "deg" suffix but continue with 10th of
+    // degrees for now for the sake of existing OOo/LO documents, until the
+    // new versions that can read "deg" suffix are widely deployed and we can
+    // start to write the "deg" suffix.
+    sal_Int32 nValue(0);
+    double fValue(0.0);
+    bool bRet = ::sax::Converter::convertDouble(fValue, rString);
+    if (std::u16string_view::npos != rString.find(u"deg"))
+    {
+        nValue = fValue * 10.0;
+    }
+    else if (std::u16string_view::npos != rString.find(u"grad"))
+    {
+        nValue = (fValue * 9.0 / 10.0) * 10.0;
+    }
+    else if (std::u16string_view::npos != rString.find(u"rad"))
+    {
+        nValue = basegfx::rad2deg<10>(fValue);
+    }
+    else // no explicit unit
+    {
+        if (isWrongOOo10thDegAngle)
+        {
+            nValue = fValue; // wrong, but backward compatible with OOo/LO < 7.0
+        }
+        else
+        {
+            nValue = fValue * 10.0; // ODF 1.2
+        }
+    }
+    // limit to valid range [0..3600]
+    nValue = nValue % 3600;
+    if (nValue < 0)
+    {
+        nValue += 3600;
+    }
+    assert(0 <= nValue && nValue <= 3600);
+    if (bRet)
+    {
+        rAngle = sal::static_int_cast<sal_Int16>(nValue);
+    }
+    return bRet;
+}
+
+/** convert SVG angle to number, 10th of degrees with range [0..3600] */
+bool Converter::convertAngle(sal_Int16& rAngle, std::string_view rString,
+        bool const isWrongOOo10thDegAngle)
+{
+    // ODF 1.1 leaves it undefined what the number means, but ODF 1.2 says it's
+    // degrees, while OOo has historically used 10th of degrees :(
+    // So import degrees when we see the "deg" suffix but continue with 10th of
+    // degrees for now for the sake of existing OOo/LO documents, until the
+    // new versions that can read "deg" suffix are widely deployed and we can
+    // start to write the "deg" suffix.
+    sal_Int32 nValue(0);
+    double fValue(0.0);
+    bool bRet = ::sax::Converter::convertDouble(fValue, rString);
+    if (std::string_view::npos != rString.find("deg"))
+    {
+        nValue = fValue * 10.0;
+    }
+    else if (std::string_view::npos != rString.find("grad"))
+    {
+        nValue = (fValue * 9.0 / 10.0) * 10.0;
+    }
+    else if (std::string_view::npos != rString.find("rad"))
+    {
+        nValue = basegfx::rad2deg<10>(fValue);
+    }
+    else // no explicit unit
+    {
+        if (isWrongOOo10thDegAngle)
+        {
+            nValue = fValue; // wrong, but backward compatible with OOo/LO < 7.0
+        }
+        else
+        {
+            nValue = fValue * 10.0; // ODF 1.2
+        }
+    }
+    // limit to valid range [0..3600]
+    nValue = nValue % 3600;
+    if (nValue < 0)
+    {
+        nValue += 3600;
+    }
+    assert(0 <= nValue && nValue <= 3600);
+    if (bRet)
+    {
+        rAngle = sal::static_int_cast<sal_Int16>(nValue);
+    }
+    return bRet;
+}
+
+/** convert double to ISO "duration" string; negative durations allowed */
+void Converter::convertDuration(OUStringBuffer& rBuffer,
+                                const double fTime)
+{
+    double fValue = fTime;
+
+    // take care of negative durations as specified in:
+    // XML Schema, W3C Working Draft 07 April 2000, section 3.2.6.1
+    if (fValue < 0.0)
+    {
+        rBuffer.append('-');
+        fValue = - fValue;
+    }
+
+    rBuffer.append( "PT" );
+    fValue *= 24;
+    double fHoursValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fHoursValue;
+    fValue *= 60;
+    double fMinsValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fMinsValue;
+    fValue *= 60;
+    double fSecsValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fSecsValue;
+    double fNanoSecsValue;
+    if (fValue > 0.00000000001)
+        fNanoSecsValue = ::rtl::math::round( fValue, XML_MAXDIGITSCOUNT_TIME - 5);
+    else
+        fNanoSecsValue = 0.0;
+
+    if (fNanoSecsValue == 1.0)
+    {
+        fNanoSecsValue = 0.0;
+        fSecsValue += 1.0;
+    }
+    if (fSecsValue >= 60.0)
+    {
+        fSecsValue -= 60.0;
+        fMinsValue += 1.0;
+    }
+    if (fMinsValue >= 60.0)
+    {
+        fMinsValue -= 60.0;
+        fHoursValue += 1.0;
+    }
+
+    if (fHoursValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fHoursValue));
+    rBuffer.append( 'H');
+    if (fMinsValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fMinsValue));
+    rBuffer.append( 'M');
+    if (fSecsValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fSecsValue));
+    if (fNanoSecsValue > 0.0)
+    {
+        OUString aNS( ::rtl::math::doubleToUString( fValue,
+                    rtl_math_StringFormat_F, XML_MAXDIGITSCOUNT_TIME - 5, '.',
+                    true));
+        if ( aNS.getLength() > 2 )
+        {
+            rBuffer.append( '.');
+            rBuffer.append( aNS.subView(2) );     // strip "0."
+        }
+    }
+    rBuffer.append( 'S');
+}
+
+/** helper function of Converter::convertDuration */
+template<typename V>
+static bool convertDurationHelper(double& rfTime, V pStr)
+{
+    // negative time duration?
+    bool bIsNegativeDuration = false;
+    if ( '-' == (*pStr) )
+    {
+        bIsNegativeDuration = true;
+        pStr++;
+    }
+
+    if ( *pStr != 'P' && *pStr != 'p' )            // duration must start with "P"
+        return false;
+    pStr++;
+
+    OUStringBuffer sDoubleStr;
+    bool bSuccess = true;
+    bool bDone = false;
+    bool bTimePart = false;
+    bool bIsFraction = false;
+    sal_Int32 nDays  = 0;
+    sal_Int32 nHours = 0;
+    sal_Int32 nMins  = 0;
+    sal_Int32 nSecs  = 0;
+    sal_Int32 nTemp = 0;
+
+    while ( bSuccess && !bDone )
+    {
+        sal_Unicode c = *(pStr++);
+        if ( !c )                               // end
+            bDone = true;
+        else if ( '0' <= c && '9' >= c )
+        {
+            if ( nTemp >= SAL_MAX_INT32 / 10 )
+                bSuccess = false;
+            else
+            {
+                if ( !bIsFraction )
+                {
+                    nTemp *= 10;
+                    nTemp += (c - u'0');
+                }
+                else
+                {
+                    sDoubleStr.append(c);
+                }
+            }
+        }
+        else if ( bTimePart )
+        {
+            if ( c == 'H' || c == 'h' )
+            {
+                nHours = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'M' || c == 'm')
+            {
+                nMins = nTemp;
+                nTemp = 0;
+            }
+            else if ( (c == ',') || (c == '.') )
+            {
+                nSecs = nTemp;
+                nTemp = 0;
+                bIsFraction = true;
+                sDoubleStr = "0.";
+            }
+            else if ( c == 'S' || c == 's' )
+            {
+                if ( !bIsFraction )
+                {
+                    nSecs = nTemp;
+                    nTemp = 0;
+                    sDoubleStr = "0.0";
+                }
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+        else
+        {
+            if ( c == 'T' || c == 't' )            // "T" starts time part
+                bTimePart = true;
+            else if ( c == 'D' || c == 'd')
+            {
+                nDays = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'Y' || c == 'y' || c == 'M' || c == 'm' )
+            {
+                //! how many days is a year or month?
+
+                OSL_FAIL( "years or months in duration: not implemented");
+                bSuccess = false;
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+    }
+
+    if ( bSuccess )
+    {
+        if ( nDays )
+            nHours += nDays * 24;               // add the days to the hours part
+        double fHour = nHours;
+        double fMin = nMins;
+        double fSec = nSecs;
+        double fFraction = o3tl::toDouble(sDoubleStr);
+        double fTempTime = fHour / 24;
+        fTempTime += fMin / (24 * 60);
+        fTempTime += fSec / (24 * 60 * 60);
+        fTempTime += fFraction / (24 * 60 * 60);
+
+        // negative duration?
+        if ( bIsNegativeDuration )
+        {
+            fTempTime = -fTempTime;
+        }
+
+        rfTime = fTempTime;
+    }
+    return bSuccess;
+}
+
+/** convert ISO "duration" string to double; negative durations allowed */
+bool Converter::convertDuration(double& rfTime,
+                                std::string_view rString)
+{
+    std::string_view aTrimmed = o3tl::trim(rString);
+    const char* pStr = aTrimmed.data();
+
+    return convertDurationHelper(rfTime, pStr);
+}
+
+/** convert util::Duration to ISO8601 "duration" string */
+void Converter::convertDuration(OUStringBuffer& rBuffer,
+        const ::util::Duration& rDuration)
+{
+    if (rDuration.Negative)
+    {
+        rBuffer.append('-');
+    }
+    rBuffer.append('P');
+    const bool bHaveDate(rDuration.Years  != 0 ||
+                         rDuration.Months != 0 ||
+                         rDuration.Days   != 0);
+    if (rDuration.Years)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Years));
+        rBuffer.append('Y');
+    }
+    if (rDuration.Months)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Months));
+        rBuffer.append('M');
+    }
+    if (rDuration.Days)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Days));
+        rBuffer.append('D');
+    }
+    if ( rDuration.Hours != 0
+         || rDuration.Minutes != 0
+         || rDuration.Seconds != 0
+         || rDuration.NanoSeconds != 0 )
+    {
+        rBuffer.append('T'); // time separator
+        if (rDuration.Hours)
+        {
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Hours));
+            rBuffer.append('H');
+        }
+        if (rDuration.Minutes)
+        {
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Minutes));
+            rBuffer.append('M');
+        }
+        if (rDuration.Seconds != 0 || rDuration.NanoSeconds != 0)
+        {
+            // seconds must not be omitted (i.e. ".42S" is not valid)
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Seconds));
+            if (rDuration.NanoSeconds)
+            {
+                OSL_ENSURE(rDuration.NanoSeconds < 1000000000,"NanoSeconds cannot be more than 999 999 999");
+                rBuffer.append('.');
+                std::ostringstream ostr;
+                ostr.fill('0');
+                ostr.width(9);
+                ostr << rDuration.NanoSeconds;
+                rBuffer.appendAscii(ostr.str().c_str());
+            }
+            rBuffer.append('S');
+        }
+    }
+    else if (!bHaveDate)
+    {
+        // zero duration: XMLSchema-2 says there must be at least one component
+        rBuffer.append('0');
+        rBuffer.append('D');
+    }
+}
+
+namespace {
+
+enum Result { R_NOTHING, R_OVERFLOW, R_SUCCESS };
+
+}
+
+template <typename V>
+static Result
+readUnsignedNumber(V rString,
+    size_t & io_rnPos, sal_Int32 & o_rNumber)
+{
+    size_t nPos(io_rnPos);
+
+    while (nPos < rString.size())
+    {
+        const typename V::value_type c = rString[nPos];
+        if (('0' > c) || (c > '9'))
+            break;
+        ++nPos;
+    }
+
+    if (io_rnPos == nPos) // read something?
+    {
+        o_rNumber = -1;
+        return R_NOTHING;
+    }
+
+    const sal_Int64 nTemp = toInt64_WithLength(rString.data() + io_rnPos, 10, nPos - io_rnPos);
+
+    const bool bOverflow = (nTemp >= SAL_MAX_INT32);
+
+    io_rnPos = nPos;
+    o_rNumber = nTemp;
+    return bOverflow ? R_OVERFLOW : R_SUCCESS;
+}
+
+template<typename V>
+static Result
+readUnsignedNumberMaxDigits(int maxDigits,
+                            V rString, size_t & io_rnPos,
+                            sal_Int32 & o_rNumber)
+{
+    bool bOverflow(false);
+    sal_Int64 nTemp(0);
+    size_t nPos(io_rnPos);
+    OSL_ENSURE(maxDigits >= 0, "negative amount of digits makes no sense");
+
+    while (nPos < rString.size())
+    {
+        const sal_Unicode c = rString[nPos];
+        if (('0' <= c) && (c <= '9'))
+        {
+            if (maxDigits > 0)
+            {
+                nTemp *= 10;
+                nTemp += (c - u'0');
+                if (nTemp >= SAL_MAX_INT32)
+                {
+                    bOverflow = true;
+                }
+                --maxDigits;
+            }
+        }
+        else
+        {
+            break;
+        }
+        ++nPos;
+    }
+
+    if (io_rnPos == nPos) // read something?
+    {
+        o_rNumber = -1;
+        return R_NOTHING;
+    }
+
+    io_rnPos = nPos;
+    o_rNumber = nTemp;
+    return bOverflow ? R_OVERFLOW : R_SUCCESS;
+}
+
+template<typename V>
+static bool
+readDurationT(V rString, size_t & io_rnPos)
+{
+    if ((io_rnPos < rString.size()) &&
+        (rString[io_rnPos] == 'T' || rString[io_rnPos] == 't'))
+    {
+        ++io_rnPos;
+        return true;
+    }
+    return false;
+}
+
+template<typename V>
+static bool
+readDurationComponent(V rString,
+    size_t & io_rnPos, sal_Int32 & io_rnTemp, bool & io_rbTimePart,
+    sal_Int32 & o_rnTarget, const sal_Unicode cLower, const sal_Unicode cUpper)
+{
+    if (io_rnPos < rString.size())
+    {
+        if (cLower == rString[io_rnPos] || cUpper == rString[io_rnPos])
+        {
+            ++io_rnPos;
+            if (-1 != io_rnTemp)
+            {
+                o_rnTarget = io_rnTemp;
+                io_rnTemp = -1;
+                if (!io_rbTimePart)
+                {
+                    io_rbTimePart = readDurationT(rString, io_rnPos);
+                }
+                return (R_OVERFLOW !=
+                        readUnsignedNumber(rString, io_rnPos, io_rnTemp));
+            }
+            else
+            {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+template <typename V>
+static bool convertDurationHelper(util::Duration& rDuration, V string)
+{
+    size_t nPos(0);
+
+    bool bIsNegativeDuration(false);
+    if (!string.empty() && ('-' == string[0]))
+    {
+        bIsNegativeDuration = true;
+        ++nPos;
+    }
+
+    if (nPos < string.size()
+        && string[nPos] != 'P' && string[nPos] != 'p') // duration must start with "P"
+    {
+        return false;
+    }
+
+    ++nPos;
+
+    /// last read number; -1 == no valid number! always reset after using!
+    sal_Int32 nTemp(-1);
+    bool bTimePart(false); // have we read 'T'?
+    bool bSuccess(false);
+    sal_Int32 nYears(0);
+    sal_Int32 nMonths(0);
+    sal_Int32 nDays(0);
+    sal_Int32 nHours(0);
+    sal_Int32 nMinutes(0);
+    sal_Int32 nSeconds(0);
+    sal_Int32 nNanoSeconds(0);
+
+    bTimePart = readDurationT(string, nPos);
+    bSuccess = (R_SUCCESS == readUnsignedNumber(string, nPos, nTemp));
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nYears, 'y', 'Y');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nMonths, 'm', 'M');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nDays, 'd', 'D');
+    }
+
+    if (bTimePart)
+    {
+        if (-1 == nTemp) // a 'T' must be followed by a component
+        {
+            bSuccess = false;
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nHours, 'h', 'H');
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nMinutes, 'm', 'M');
+        }
+
+        // eeek! seconds are icky.
+        if ((nPos < string.size()) && bSuccess)
+        {
+            if (string[nPos] == '.' ||
+                string[nPos] == ',')
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                    const sal_Int32 nStart(nPos);
+                    bSuccess = readUnsignedNumberMaxDigits(9, string, nPos, nTemp) == R_SUCCESS;
+                    if ((nPos < string.size()) && bSuccess)
+                    {
+                        if (-1 != nTemp)
+                        {
+                            nNanoSeconds = nTemp;
+                            sal_Int32 nDigits = nPos - nStart;
+                            assert(nDigits >= 0);
+                            for (; nDigits < 9; ++nDigits)
+                            {
+                                nNanoSeconds *= 10;
+                            }
+                            nTemp=-1;
+                            if ('S' == string[nPos] || 's' == string[nPos])
+                            {
+                                ++nPos;
+                            }
+                            else
+                            {
+                                bSuccess = false;
+                            }
+                        }
+                        else
+                        {
+                            bSuccess = false;
+                        }
+                    }
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+            else if ('S' == string[nPos] || 's' == string[nPos])
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+        }
+    }
+
+    if (nPos != string.size()) // string not processed completely?
+    {
+        bSuccess = false;
+    }
+
+    if (nTemp != -1) // unprocessed number?
+    {
+        bSuccess = false;
+    }
+
+    if (bSuccess)
+    {
+        rDuration.Negative      = bIsNegativeDuration;
+        rDuration.Years         = static_cast<sal_Int16>(nYears);
+        rDuration.Months        = static_cast<sal_Int16>(nMonths);
+        rDuration.Days          = static_cast<sal_Int16>(nDays);
+        rDuration.Hours         = static_cast<sal_Int16>(nHours);
+        rDuration.Minutes       = static_cast<sal_Int16>(nMinutes);
+        rDuration.Seconds       = static_cast<sal_Int16>(nSeconds);
+        rDuration.NanoSeconds   = nNanoSeconds;
+    }
+
+    return bSuccess;
+}
+
+/** convert ISO8601 "duration" string to util::Duration */
+bool Converter::convertDuration(util::Duration& rDuration,
+                                std::u16string_view rString)
+{
+    return convertDurationHelper(rDuration, o3tl::trim(rString));
+}
+
+/** convert ISO8601 "duration" string to util::Duration */
+bool Converter::convertDuration(util::Duration& rDuration,
+                                std::string_view rString)
+{
+    return convertDurationHelper(rDuration, o3tl::trim(rString));
+}
+
+static void
+lcl_AppendTimezone(OUStringBuffer & i_rBuffer, int const nOffset)
+{
+    if (0 == nOffset)
+    {
+        i_rBuffer.append('Z');
+    }
+    else
+    {
+        if (0 < nOffset)
+        {
+            i_rBuffer.append('+');
+        }
+        else
+        {
+            i_rBuffer.append('-');
+        }
+        const sal_Int32 nHours  (abs(nOffset) / 60);
+        const sal_Int32 nMinutes(abs(nOffset) % 60);
+        SAL_WARN_IF(nHours > 14 || (nHours == 14 && nMinutes > 0),
+                "sax", "convertDateTime: timezone overflow");
+        if (nHours < 10)
+        {
+            i_rBuffer.append('0');
+        }
+        i_rBuffer.append(nHours);
+        i_rBuffer.append(':');
+        if (nMinutes < 10)
+        {
+            i_rBuffer.append('0');
+        }
+        i_rBuffer.append(nMinutes);
+    }
+}
+
+/** convert util::Date to ISO "date" string */
+void Converter::convertDate(
+        OUStringBuffer& i_rBuffer,
+        const util::Date& i_rDate,
+        sal_Int16 const*const pTimeZoneOffset)
+{
+    const util::DateTime dt(0, 0, 0, 0,
+        i_rDate.Day, i_rDate.Month, i_rDate.Year, false);
+    convertDateTime(i_rBuffer, dt, pTimeZoneOffset);
+}
+
+static void convertTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime)
+{
+    if (i_rDateTime.Hours   < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( OUString::number(static_cast<sal_Int32>(i_rDateTime.Hours)) + ":");
+    if (i_rDateTime.Minutes < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( OUString::number(static_cast<sal_Int32>(i_rDateTime.Minutes) ) + ":");
+    if (i_rDateTime.Seconds < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Seconds) );
+    if (i_rDateTime.NanoSeconds > 0) {
+        OSL_ENSURE(i_rDateTime.NanoSeconds < 1000000000,"NanoSeconds cannot be more than 999 999 999");
+        i_rBuffer.append('.');
+        std::ostringstream ostr;
+        ostr.fill('0');
+        ostr.width(9);
+        ostr << i_rDateTime.NanoSeconds;
+        i_rBuffer.appendAscii(ostr.str().c_str());
+    }
+}
+
+static void convertTimeZone(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime,
+        sal_Int16 const* pTimeZoneOffset)
+{
+    if (pTimeZoneOffset)
+    {
+        lcl_AppendTimezone(i_rBuffer, *pTimeZoneOffset);
+    }
+    else if (i_rDateTime.IsUTC)
+    {
+        lcl_AppendTimezone(i_rBuffer, 0);
+    }
+}
+
+/** convert util::DateTime to ISO "time" or "dateTime" string */
+void Converter::convertTimeOrDateTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime)
+{
+    if (i_rDateTime.Year == 0 ||
+        i_rDateTime.Month < 1 || i_rDateTime.Month > 12 ||
+        i_rDateTime.Day < 1 || i_rDateTime.Day > 31)
+    {
+        convertTime(i_rBuffer, i_rDateTime);
+        convertTimeZone(i_rBuffer, i_rDateTime, nullptr);
+    }
+    else
+    {
+        convertDateTime(i_rBuffer, i_rDateTime, nullptr, true);
+    }
+}
+
+/** convert util::DateTime to ISO "date" or "dateTime" string */
+void Converter::convertDateTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime,
+        sal_Int16 const*const pTimeZoneOffset,
+        bool i_bAddTimeIf0AM )
+{
+    const sal_Unicode dash('-');
+    const sal_Unicode zero('0');
+
+    sal_Int32 const nYear(abs(i_rDateTime.Year));
+    if (i_rDateTime.Year < 0) {
+        i_rBuffer.append(dash); // negative
+    }
+    if (nYear < 1000) {
+        i_rBuffer.append(zero);
+    }
+    if (nYear < 100) {
+        i_rBuffer.append(zero);
+    }
+    if (nYear < 10) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( OUString::number(nYear) + OUStringChar(dash) );
+    if( i_rDateTime.Month < 10 ) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( OUString::number(i_rDateTime.Month) + OUStringChar(dash) );
+    if( i_rDateTime.Day   < 10 ) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Day)   );
+
+    if( i_rDateTime.Seconds != 0 ||
+        i_rDateTime.Minutes != 0 ||
+        i_rDateTime.Hours   != 0 ||
+        i_bAddTimeIf0AM )
+    {
+        i_rBuffer.append('T');
+        convertTime(i_rBuffer, i_rDateTime);
+    }
+
+    convertTimeZone(i_rBuffer, i_rDateTime, pTimeZoneOffset);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime */
+bool Converter::parseDateTime(   util::DateTime& rDateTime,
+                                 std::u16string_view rString )
+{
+    bool isDateTime;
+    return parseDateOrDateTime(nullptr, rDateTime, isDateTime, nullptr,
+            rString);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime */
+bool Converter::parseDateTime(   util::DateTime& rDateTime,
+                                 std::string_view rString )
+{
+    bool isDateTime;
+    return parseDateOrDateTime(nullptr, rDateTime, isDateTime, nullptr,
+            rString);
+}
+
+static bool lcl_isLeapYear(const sal_uInt32 nYear)
+{
+    return ((nYear % 4) == 0)
+        && (((nYear % 100) != 0) || ((nYear % 400) == 0));
+}
+
+static sal_uInt16
+lcl_MaxDaysPerMonth(const sal_Int32 nMonth, const sal_Int32 nYear)
+{
+    static const sal_uInt16 s_MaxDaysPerMonth[12] =
+        { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+    assert(0 < nMonth && nMonth <= 12);
+    if ((2 == nMonth) && lcl_isLeapYear(nYear))
+    {
+        return 29;
+    }
+    return s_MaxDaysPerMonth[nMonth - 1];
+}
+
+static void lcl_ConvertToUTC(
+        sal_Int16 & o_rYear, sal_uInt16 & o_rMonth, sal_uInt16 & o_rDay,
+        sal_uInt16 & o_rHours, sal_uInt16 & o_rMinutes,
+        int const nSourceOffset)
+{
+    sal_Int16 nOffsetHours(abs(nSourceOffset) / 60);
+    sal_Int16 const nOffsetMinutes(abs(nSourceOffset) % 60);
+    o_rMinutes += nOffsetMinutes;
+    if (nSourceOffset < 0)
+    {
+        o_rMinutes += nOffsetMinutes;
+        if (60 <= o_rMinutes)
+        {
+            o_rMinutes -= 60;
+            ++nOffsetHours;
+        }
+        o_rHours += nOffsetHours;
+        if (o_rHours < 24)
+        {
+            return;
+        }
+        sal_Int16 nDayAdd(0);
+        while (24 <= o_rHours)
+        {
+            o_rHours -= 24;
+            ++nDayAdd;
+        }
+        if (o_rDay == 0)
+        {
+            return; // handle time without date - don't adjust what isn't there
+        }
+        o_rDay += nDayAdd;
+        sal_Int16 const nDaysInMonth(lcl_MaxDaysPerMonth(o_rMonth, o_rYear));
+        if (o_rDay <= nDaysInMonth)
+        {
+            return;
+        }
+        o_rDay -= nDaysInMonth;
+        ++o_rMonth;
+        if (o_rMonth <= 12)
+        {
+            return;
+        }
+        o_rMonth = 1;
+        ++o_rYear; // works for negative year too
+    }
+    else if (0 < nSourceOffset)
+    {
+        // argh everything is unsigned
+        if (o_rMinutes < nOffsetMinutes)
+        {
+            o_rMinutes += 60;
+            ++nOffsetHours;
+        }
+        o_rMinutes -= nOffsetMinutes;
+        sal_Int16 nDaySubtract(0);
+        while (o_rHours < nOffsetHours)
+        {
+            o_rHours += 24;
+            ++nDaySubtract;
+        }
+        o_rHours -= nOffsetHours;
+        if (o_rDay == 0)
+        {
+            return; // handle time without date - don't adjust what isn't there
+        }
+        if (nDaySubtract < o_rDay)
+        {
+            o_rDay -= nDaySubtract;
+            return;
+        }
+        sal_Int16 const nPrevMonth((o_rMonth == 1) ? 12 : o_rMonth - 1);
+        sal_Int16 const nDaysInMonth(lcl_MaxDaysPerMonth(nPrevMonth, o_rYear));
+        o_rDay += nDaysInMonth;
+        --o_rMonth;
+        if (0 == o_rMonth)
+        {
+            o_rMonth = 12;
+            --o_rYear; // works for negative year too
+        }
+        o_rDay -= nDaySubtract;
+    }
+}
+
+template <typename V>
+static bool
+readDateTimeComponent(V rString,
+    size_t & io_rnPos, sal_Int32 & o_rnTarget,
+    const sal_Int32 nMinLength, const bool bExactLength)
+{
+    const size_t nOldPos(io_rnPos);
+    sal_Int32 nTemp(0);
+    if (R_SUCCESS != readUnsignedNumber<V>(rString, io_rnPos, nTemp))
+    {
+        return false;
+    }
+    const sal_Int32 nTokenLength(io_rnPos - nOldPos);
+    if ((nTokenLength < nMinLength) ||
+        (bExactLength && (nTokenLength > nMinLength)))
+    {
+        return false; // bad length
+    }
+    o_rnTarget = nTemp;
+    return true;
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template<typename V>
+static bool lcl_parseDate(
+                bool & isNegative,
+                sal_Int32 & nYear, sal_Int32 & nMonth, sal_Int32 & nDay,
+                bool & bHaveTime,
+                size_t & nPos,
+                V string,
+                bool const bIgnoreInvalidOrMissingDate)
+{
+    bool bSuccess = true;
+
+    if (string.size() > nPos)
+    {
+        if ('-' == string[nPos])
+        {
+            isNegative = true;
+            ++nPos;
+        }
+    }
+
+    {
+        // While W3C XMLSchema specifies years with a minimum of 4 digits, be
+        // lenient in what we accept for years < 1000. One digit is acceptable
+        // if the remainders match.
+        bSuccess = readDateTimeComponent<V>(string, nPos, nYear, 1, false);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nYear);
+        }
+        bSuccess &= (nPos < string.size()); // not last token
+    }
+    if (bSuccess && ('-' != string[nPos])) // separator
+    {
+        bSuccess = false;
+    }
+    if (bSuccess)
+    {
+        ++nPos;
+
+        bSuccess = readDateTimeComponent<V>(string, nPos, nMonth, 2, true);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nMonth);
+        }
+        bSuccess &= (nMonth <= 12);
+        bSuccess &= (nPos < string.size()); // not last token
+    }
+    if (bSuccess && ('-' != string[nPos])) // separator
+    {
+        bSuccess = false;
+    }
+    if (bSuccess)
+    {
+        ++nPos;
+
+        bSuccess = readDateTimeComponent(string, nPos, nDay, 2, true);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nDay);
+        }
+        if (nMonth > 0) // not possible to check if month was missing
+        {
+            bSuccess &= (nDay <= lcl_MaxDaysPerMonth(nMonth, nYear));
+        }
+        else assert(bIgnoreInvalidOrMissingDate);
+    }
+
+    if (bSuccess && (nPos < string.size()))
+    {
+        if ('T' == string[nPos] || 't' == string[nPos]) // time separator
+        {
+            bHaveTime = true;
+            ++nPos;
+        }
+    }
+
+    return bSuccess;
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template <typename V>
+static bool lcl_parseDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                V string,
+                bool const bIgnoreInvalidOrMissingDate)
+{
+    bool bSuccess = true;
+
+    string = o3tl::trim(string);
+
+    bool isNegative(false);
+    sal_Int32 nYear(0);
+    sal_Int32 nMonth(0);
+    sal_Int32 nDay(0);
+    size_t nPos(0);
+    bool bHaveTime(false);
+
+    if (    !bIgnoreInvalidOrMissingDate
+        ||  string.find(':') == V::npos  // no time?
+        ||  (string.find('-') != V::npos
+             && string.find('-') < string.find(':')))
+    {
+        bSuccess &= lcl_parseDate<V>(isNegative, nYear, nMonth, nDay,
+                bHaveTime, nPos, string, bIgnoreInvalidOrMissingDate);
+    }
+    else
+    {
+        bHaveTime = true;
+    }
+
+    sal_Int32 nHours(0);
+    sal_Int32 nMinutes(0);
+    sal_Int32 nSeconds(0);
+    sal_Int32 nNanoSeconds(0);
+    if (bSuccess && bHaveTime)
+    {
+        {
+            bSuccess = readDateTimeComponent(string, nPos, nHours, 2, true);
+            bSuccess &= (0 <= nHours) && (nHours <= 24);
+            bSuccess &= (nPos < string.size()); // not last token
+        }
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent(string, nPos, nMinutes, 2, true);
+            bSuccess &= (0 <= nMinutes) && (nMinutes < 60);
+            bSuccess &= (nPos < string.size()); // not last token
+        }
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent(string, nPos, nSeconds, 2, true);
+            bSuccess &= (0 <= nSeconds) && (nSeconds < 60);
+        }
+        if (bSuccess && (nPos < string.size()) &&
+            ('.' == string[nPos] || ',' == string[nPos])) // fraction separator
+        {
+            ++nPos;
+            const sal_Int32 nStart(nPos);
+            sal_Int32 nTemp(0);
+            if (R_NOTHING == readUnsignedNumberMaxDigits<V>(9, string, nPos, nTemp))
+            {
+                bSuccess = false;
+            }
+            if (bSuccess)
+            {
+                sal_Int32 nDigits = std::min<sal_Int32>(nPos - nStart, 9);
+                assert(nDigits > 0);
+                for (; nDigits < 9; ++nDigits)
+                {
+                    nTemp *= 10;
+                }
+                nNanoSeconds = nTemp;
+            }
+        }
+
+        if (bSuccess && (nHours == 24))
+        {
+            if (!((0 == nMinutes) && (0 == nSeconds) && (0 == nNanoSeconds)))
+            {
+                bSuccess = false; // only 24:00:00 is valid
+            }
+        }
+    }
+
+    bool bHaveTimezone(false);
+    bool bHaveTimezonePlus(false);
+    bool bHaveTimezoneMinus(false);
+    if (bSuccess && (nPos < string.size()))
+    {
+        const sal_Unicode c(string[nPos]);
+        if ('+' == c)
+        {
+            bHaveTimezone = true;
+            bHaveTimezonePlus = true;
+            ++nPos;
+        }
+        else if ('-' == c)
+        {
+            bHaveTimezone = true;
+            bHaveTimezoneMinus = true;
+            ++nPos;
+        }
+        else if ('Z' == c || 'z' == c)
+        {
+            bHaveTimezone = true;
+            ++nPos;
+        }
+        else
+        {
+            bSuccess = false;
+        }
+    }
+    sal_Int32 nTimezoneHours(0);
+    sal_Int32 nTimezoneMinutes(0);
+    if (bSuccess && (bHaveTimezonePlus || bHaveTimezoneMinus))
+    {
+        bSuccess = readDateTimeComponent<V>(
+                        string, nPos, nTimezoneHours, 2, true);
+        bSuccess &= (0 <= nTimezoneHours) && (nTimezoneHours <= 14);
+        bSuccess &= (nPos < string.size()); // not last token
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent<V>(
+                        string, nPos, nTimezoneMinutes, 2, true);
+            bSuccess &= (0 <= nTimezoneMinutes) && (nTimezoneMinutes < 60);
+        }
+        if (bSuccess && (nTimezoneHours == 14))
+        {
+            if (0 != nTimezoneMinutes)
+            {
+                bSuccess = false; // only +-14:00 is valid
+            }
+        }
+    }
+
+    bSuccess &= (nPos == string.size()); // trailing junk?
+
+    if (bSuccess)
+    {
+        sal_Int16 const nTimezoneOffset = (bHaveTimezoneMinus ? -1 : +1)
+                        * ((nTimezoneHours * 60) + nTimezoneMinutes);
+        if (!pDate || bHaveTime) // time is optional
+        {
+            rDateTime.Year =
+                (isNegative ? -1 : +1) * static_cast<sal_Int16>(nYear);
+            rDateTime.Month = static_cast<sal_uInt16>(nMonth);
+            rDateTime.Day = static_cast<sal_uInt16>(nDay);
+            rDateTime.Hours = static_cast<sal_uInt16>(nHours);
+            rDateTime.Minutes = static_cast<sal_uInt16>(nMinutes);
+            rDateTime.Seconds = static_cast<sal_uInt16>(nSeconds);
+            rDateTime.NanoSeconds = static_cast<sal_uInt32>(nNanoSeconds);
+            if (bHaveTimezone)
+            {
+                if (pTimeZoneOffset)
+                {
+                    *pTimeZoneOffset = nTimezoneOffset;
+                    rDateTime.IsUTC = (0 == nTimezoneOffset);
+                }
+                else
+                {
+                    lcl_ConvertToUTC(rDateTime.Year, rDateTime.Month,
+                            rDateTime.Day, rDateTime.Hours, rDateTime.Minutes,
+                            nTimezoneOffset);
+                    rDateTime.IsUTC = true;
+                }
+            }
+            else
+            {
+                if (pTimeZoneOffset)
+                {
+                    pTimeZoneOffset->reset();
+                }
+                rDateTime.IsUTC = false;
+            }
+            rbDateTime = bHaveTime;
+        }
+        else
+        {
+            pDate->Year =
+                (isNegative ? -1 : +1) * static_cast<sal_Int16>(nYear);
+            pDate->Month = static_cast<sal_uInt16>(nMonth);
+            pDate->Day = static_cast<sal_uInt16>(nDay);
+            if (bHaveTimezone)
+            {
+                if (pTimeZoneOffset)
+                {
+                    *pTimeZoneOffset = nTimezoneOffset;
+                }
+                else
+                {
+                    // a Date cannot be adjusted
+                    SAL_INFO("sax", "dropping timezone");
+                }
+            }
+            else
+            {
+                if (pTimeZoneOffset)
+                {
+                    pTimeZoneOffset->reset();
+                }
+            }
+            rbDateTime = false;
+        }
+    }
+    return bSuccess;
+}
+
+/** convert ISO "time" or "dateTime" string to util::DateTime */
+bool Converter::parseTimeOrDateTime(
+                util::DateTime & rDateTime,
+                std::u16string_view rString)
+{
+    bool dummy;
+    return lcl_parseDateTime(
+                nullptr, rDateTime, dummy, nullptr, rString, true);
+}
+
+/** convert ISO "time" or "dateTime" string to util::DateTime */
+bool Converter::parseTimeOrDateTime(
+                util::DateTime & rDateTime,
+                std::string_view rString)
+{
+    bool dummy;
+    return lcl_parseDateTime(
+                nullptr, rDateTime, dummy, nullptr, rString, true);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+bool Converter::parseDateOrDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                std::u16string_view rString )
+{
+    return lcl_parseDateTime(
+                pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+bool Converter::parseDateOrDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                std::string_view rString )
+{
+    return lcl_parseDateTime(
+                pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
+}
+
+/** gets the position of the first comma after npos in the string
+    rStr. Commas inside '"' pairs are not matched */
+sal_Int32 Converter::indexOfComma( std::u16string_view rStr,
+                                            sal_Int32 nPos )
+{
+    sal_Unicode cQuote = 0;
+    sal_Int32 nLen = rStr.size();
+    for( ; nPos < nLen; nPos++ )
+    {
+        sal_Unicode c = rStr[nPos];
+        switch( c )
+        {
+        case u'\'':
+            if( 0 == cQuote )
+                cQuote = c;
+            else if( '\'' == cQuote )
+                cQuote = 0;
+            break;
+
+        case u'"':
+            if( 0 == cQuote )
+                cQuote = c;
+            else if( '\"' == cQuote )
+                cQuote = 0;
+            break;
+
+        case u',':
+            if( 0 == cQuote )
+                return nPos;
+            break;
+        }
+    }
+
+    return -1;
+}
+
+double Converter::GetConversionFactor(OUStringBuffer& rUnit, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    double fRetval(1.0);
+    rUnit.setLength(0);
+
+
+    if(nSourceUnit != nTargetUnit)
+    {
+        const o3tl::Length eFrom = Measure2O3tlUnit(nSourceUnit);
+        const o3tl::Length eTo = Measure2O3tlUnit(nTargetUnit);
+        fRetval = o3tl::convert(1.0, eFrom, eTo);
+
+        if (const auto sUnit = Measure2UnitString(nTargetUnit); sUnit.size() > 0)
+            rUnit.appendAscii(sUnit.data(), sUnit.size());
+    }
+
+    return fRetval;
+}
+
+double Converter::GetConversionFactor(OStringBuffer& rUnit, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    double fRetval(1.0);
+    rUnit.setLength(0);
+
+
+    if(nSourceUnit != nTargetUnit)
+    {
+        const o3tl::Length eFrom = Measure2O3tlUnit(nSourceUnit);
+        const o3tl::Length eTo = Measure2O3tlUnit(nTargetUnit);
+        fRetval = o3tl::convert(1.0, eFrom, eTo);
+
+        if (const auto sUnit = Measure2UnitString(nTargetUnit); sUnit.size() > 0)
+            rUnit.append(sUnit.data(), sUnit.size());
+    }
+
+    return fRetval;
+}
+
+template<typename V>
+static sal_Int16 lcl_GetUnitFromString(V rString, sal_Int16 nDefaultUnit)
+{
+    sal_Int32 nPos = 0;
+    sal_Int32 nLen = rString.size();
+    sal_Int16 nRetUnit = nDefaultUnit;
+
+    // skip white space
+    while( nPos < nLen && ' ' == rString[nPos] )
+        nPos++;
+
+    // skip negative
+    if( nPos < nLen && '-' == rString[nPos] )
+        nPos++;
+
+    // skip number
+    while( nPos < nLen && '0' <= rString[nPos] && '9' >= rString[nPos] )
+        nPos++;
+
+    if( nPos < nLen && '.' == rString[nPos] )
+    {
+        nPos++;
+        while( nPos < nLen && '0' <= rString[nPos] && '9' >= rString[nPos] )
+            nPos++;
+    }
+
+    // skip white space
+    while( nPos < nLen && ' ' == rString[nPos] )
+        nPos++;
+
+    if( nPos < nLen )
+    {
+        switch(rString[nPos])
+        {
+            case '%' :
+            {
+                nRetUnit = MeasureUnit::PERCENT;
+                break;
+            }
+            case 'c':
+            case 'C':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'm'
+                    || rString[nPos+1] == 'M'))
+                    nRetUnit = MeasureUnit::CM;
+                break;
+            }
+            case 'e':
+            case 'E':
+            {
+                // CSS1_EMS or CSS1_EMX later
+                break;
+            }
+            case 'i':
+            case 'I':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'n'
+                    || rString[nPos+1] == 'N'))
+                    nRetUnit = MeasureUnit::INCH;
+                break;
+            }
+            case 'm':
+            case 'M':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'm'
+                    || rString[nPos+1] == 'M'))
+                    nRetUnit = MeasureUnit::MM;
+                break;
+            }
+            case 'p':
+            case 'P':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 't'
+                    || rString[nPos+1] == 'T'))
+                    nRetUnit = MeasureUnit::POINT;
+                if(nPos+1 < nLen && (rString[nPos+1] == 'c'
+                    || rString[nPos+1] == 'C'))
+                    nRetUnit = MeasureUnit::TWIP;
+                break;
+            }
+        }
+    }
+
+    return nRetUnit;
+}
+
+sal_Int16 Converter::GetUnitFromString(std::u16string_view rString, sal_Int16 nDefaultUnit)
+{
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
+}
+sal_Int16 Converter::GetUnitFromString(std::string_view rString, sal_Int16 nDefaultUnit)
+{
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
+}
+
+bool Converter::convertAny(OUStringBuffer&    rsValue,
+                           OUStringBuffer&    rsType ,
+                           const css::uno::Any& rValue)
+{
+    bool bConverted = false;
+
+    rsValue.setLength(0);
+    rsType.setLength (0);
+
+    switch (rValue.getValueTypeClass())
+    {
+        case css::uno::TypeClass_BYTE :
+        case css::uno::TypeClass_SHORT :
+        case css::uno::TypeClass_UNSIGNED_SHORT :
+        case css::uno::TypeClass_LONG :
+        case css::uno::TypeClass_UNSIGNED_LONG :
+            {
+                sal_Int32 nTempValue = 0;
+                if (rValue >>= nTempValue)
+                {
+                    rsType.append("integer");
+                    bConverted = true;
+                    rsValue.append(nTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_BOOLEAN :
+            {
+                bool bTempValue = false;
+                if (rValue >>= bTempValue)
+                {
+                    rsType.append("boolean");
+                    bConverted = true;
+                    ::sax::Converter::convertBool(rsValue, bTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_FLOAT :
+        case css::uno::TypeClass_DOUBLE :
+            {
+                double fTempValue = 0.0;
+                if (rValue >>= fTempValue)
+                {
+                    rsType.append("float");
+                    bConverted = true;
+                    ::sax::Converter::convertDouble(rsValue, fTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_STRING :
+            {
+                OUString sTempValue;
+                if (rValue >>= sTempValue)
+                {
+                    rsType.append("string");
+                    bConverted = true;
+                    rsValue.append(sTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_STRUCT :
+            {
+                css::util::Date     aDate    ;
+                css::util::Time     aTime    ;
+                css::util::DateTime aDateTime;
+
+                if (rValue >>= aDate)
+                {
+                    rsType.append("date");
+                    bConverted = true;
+                    css::util::DateTime aTempValue;
+                    aTempValue.Day              = aDate.Day;
+                    aTempValue.Month            = aDate.Month;
+                    aTempValue.Year             = aDate.Year;
+                    aTempValue.NanoSeconds = 0;
+                    aTempValue.Seconds          = 0;
+                    aTempValue.Minutes          = 0;
+                    aTempValue.Hours            = 0;
+                    ::sax::Converter::convertDateTime(rsValue, aTempValue, nullptr);
+                }
+                else
+                if (rValue >>= aTime)
+                {
+                    rsType.append("time");
+                    bConverted = true;
+                    css::util::Duration aTempValue;
+                    aTempValue.Days             = 0;
+                    aTempValue.Months           = 0;
+                    aTempValue.Years            = 0;
+                    aTempValue.NanoSeconds     = aTime.NanoSeconds;
+                    aTempValue.Seconds          = aTime.Seconds;
+                    aTempValue.Minutes          = aTime.Minutes;
+                    aTempValue.Hours            = aTime.Hours;
+                    ::sax::Converter::convertDuration(rsValue, aTempValue);
+                }
+                else
+                if (rValue >>= aDateTime)
+                {
+                    rsType.append("date");
+                    bConverted = true;
+                    ::sax::Converter::convertDateTime(rsValue, aDateTime, nullptr);
+                }
+            }
+            break;
+        default:
+            break;
+    }
+
+    return bConverted;
+}
+
+void Converter::convertBytesToHexBinary(OUStringBuffer& rBuffer, const void* pBytes,
+                                        sal_Int32 nBytes)
+{
+    rBuffer.setLength(0);
+    rBuffer.ensureCapacity(nBytes * 2);
+    auto pChars = static_cast<const unsigned char*>(pBytes);
+    for (sal_Int32 i = 0; i < nBytes; ++i)
+    {
+        sal_Int32 c = *pChars++;
+        if (c < 16)
+            rBuffer.append('0');
+        rBuffer.append(c, 16);
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/fastattribs.cxx b/sax/source/tools/fastattribs.cxx
new file mode 100644
index 0000000000..45e2e9c5eb
--- /dev/null
+++ b/sax/source/tools/fastattribs.cxx
@@ -0,0 +1,290 @@
+/* -*- 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 <algorithm>
+
+#include <com/sun/star/xml/sax/SAXException.hpp>
+#include <sax/fastattribs.hxx>
+#include <utility>
+
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::xml;
+using namespace ::com::sun::star::xml::sax;
+namespace sax_fastparser
+{
+
+// wastage to keep MSVC happy vs. an in-line {}
+FastTokenHandlerBase::~FastTokenHandlerBase()
+{
+}
+
+UnknownAttribute::UnknownAttribute( OUString aNamespaceURL, OString aName, OString value )
+    : maNamespaceURL(std::move( aNamespaceURL )), maName(std::move( aName )), maValue(std::move( value ))
+{
+}
+
+UnknownAttribute::UnknownAttribute( OString aName, OString value )
+    : maName(std::move( aName )), maValue(std::move( value ))
+{
+}
+
+void UnknownAttribute::FillAttribute( Attribute* pAttrib ) const
+{
+    if( pAttrib )
+    {
+        pAttrib->Name = OStringToOUString( maName, RTL_TEXTENCODING_UTF8 );
+        pAttrib->NamespaceURL = maNamespaceURL;
+        pAttrib->Value = OStringToOUString( maValue, RTL_TEXTENCODING_UTF8 );
+    }
+}
+
+FastAttributeList::FastAttributeList( sax_fastparser::FastTokenHandlerBase *pTokenHandler)
+: mpTokenHandler( pTokenHandler )
+{
+    // random initial size of buffer to store attribute values
+    mnChunkLength = 58;
+    mpChunk = static_cast<char *>(malloc( mnChunkLength ));
+    maAttributeValues.push_back( 0 );
+}
+
+FastAttributeList::FastAttributeList( const css::uno::Reference< css::xml::sax::XFastAttributeList > & xAttrList )
+{
+    const auto& rOther = castToFastAttributeList(xAttrList);
+    mpTokenHandler = rOther.mpTokenHandler;
+    mpChunk = static_cast<char *>(malloc( rOther.mnChunkLength ));
+    mnChunkLength = rOther.mnChunkLength;
+    memcpy(mpChunk, rOther.mpChunk, rOther.mnChunkLength);
+    maAttributeValues = rOther.maAttributeValues;
+    maAttributeTokens = rOther.maAttributeTokens;
+    maUnknownAttributes = rOther.maUnknownAttributes;
+}
+
+css::uno::Reference< ::css::util::XCloneable > FastAttributeList::createClone()
+{
+    return new FastAttributeList(this);
+}
+
+FastAttributeList::~FastAttributeList()
+{
+    free( mpChunk );
+}
+
+void FastAttributeList::clear()
+{
+    maAttributeTokens.clear();
+    maAttributeValues.resize(1);
+    assert(maAttributeValues[0] == 0);
+    maUnknownAttributes.clear();
+}
+
+void FastAttributeList::add( sal_Int32 nToken, std::string_view value )
+{
+    assert(nToken != -1);
+    assert(nToken != 0);
+    assert(value.length() < SAL_MAX_INT32); // protect against absurd values
+    maAttributeTokens.push_back( nToken );
+    sal_Int32 nWritePosition = maAttributeValues.back();
+    maAttributeValues.push_back( maAttributeValues.back() + value.length() + 1 );
+    if (maAttributeValues.back() > mnChunkLength)
+    {
+        const sal_Int32 newLen = std::max(mnChunkLength * 2, maAttributeValues.back());
+        auto p = static_cast<char*>(realloc(mpChunk, newLen));
+        if (!p)
+            throw std::bad_alloc();
+
+        mnChunkLength = newLen;
+        mpChunk = p;
+
+    }
+    memcpy(mpChunk + nWritePosition, value.data(), value.length());
+    mpChunk[nWritePosition + value.length()] = '\0';
+}
+
+void FastAttributeList::add(sal_Int32 nToken, std::u16string_view sValue)
+{
+    add(nToken, OUStringToOString(sValue, RTL_TEXTENCODING_UTF8));
+}
+
+void FastAttributeList::addNS( sal_Int32 nNamespaceToken, sal_Int32 nToken, std::string_view rValue )
+{
+    sal_Int32 nCombinedToken = (nNamespaceToken << 16) | nToken;
+    add( nCombinedToken, rValue );
+}
+
+void FastAttributeList::addNS(sal_Int32 nNamespaceToken, sal_Int32 nToken,
+                                     std::u16string_view sValue)
+{
+    sal_Int32 nCombinedToken = (nNamespaceToken << 16) | nToken;
+    add(nCombinedToken, sValue);
+}
+
+void FastAttributeList::addUnknown( const OUString& rNamespaceURL, const OString& rName, const OString& value )
+{
+    maUnknownAttributes.emplace_back( rNamespaceURL, rName, value );
+}
+
+void FastAttributeList::addUnknown( const OString& rName, const OString& value )
+{
+    maUnknownAttributes.emplace_back( rName, value );
+}
+
+void FastAttributeList::add( const css::uno::Reference<css::xml::sax::XFastAttributeList>& xAttrList )
+{
+    const auto& rOther = castToFastAttributeList(xAttrList);
+    add(rOther);
+}
+
+void FastAttributeList::add( const FastAttributeList& rOther )
+{
+    for (size_t i=0; i < rOther.maAttributeTokens.size(); ++i)
+        add(rOther.maAttributeTokens[i], rOther.getAsViewByIndex(i));
+    for (const auto & i : rOther.maUnknownAttributes)
+        addUnknown(i.maNamespaceURL, i.maName, i.maValue);
+}
+
+// XFastAttributeList
+sal_Bool FastAttributeList::hasAttribute( ::sal_Int32 Token )
+{
+    for (sal_Int32 i : maAttributeTokens)
+        if (i == Token)
+            return true;
+
+    return false;
+}
+
+sal_Int32 FastAttributeList::getValueToken( ::sal_Int32 Token )
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == Token)
+            return FastTokenHandlerBase::getTokenFromChars(
+                       mpTokenHandler,
+                       getAsViewByIndex(i) );
+
+    throw SAXException("FastAttributeList::getValueToken: unknown token " + OUString::number(Token), nullptr, Any());
+}
+
+sal_Int32 FastAttributeList::getOptionalValueToken( ::sal_Int32 Token, ::sal_Int32 Default )
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == Token)
+            return FastTokenHandlerBase::getTokenFromChars(
+                       mpTokenHandler,
+                       getAsViewByIndex(i) );
+
+    return Default;
+}
+
+// performance sensitive shortcuts to avoid allocation ...
+bool FastAttributeList::getAsInteger( sal_Int32 nToken, sal_Int32 &rInt) const
+{
+    rInt = 0;
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == nToken)
+        {
+            rInt = getAsIntegerByIndex(i);
+            return true;
+        }
+    return false;
+}
+
+bool FastAttributeList::getAsDouble( sal_Int32 nToken, double &rDouble) const
+{
+    rDouble = 0.0;
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == nToken)
+        {
+            rDouble = o3tl::toDouble(getAsViewByIndex(i));
+            return true;
+        }
+    return false;
+}
+
+bool FastAttributeList::getAsView( sal_Int32 nToken, std::string_view& rPos ) const
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+    {
+        if (maAttributeTokens[i] != nToken)
+            continue;
+
+        rPos = getAsViewByIndex(i);
+        return true;
+    }
+
+    return false;
+}
+
+OUString FastAttributeList::getValue( ::sal_Int32 Token )
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == Token)
+            return getValueByIndex(i);
+
+    throw SAXException("FastAttributeList::getValue: unknown token " + OUString::number(Token), nullptr, Any());
+}
+
+OUString FastAttributeList::getOptionalValue( ::sal_Int32 Token )
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if (maAttributeTokens[i] == Token)
+            return getValueByIndex(i);
+
+    return OUString();
+}
+Sequence< Attribute > FastAttributeList::getUnknownAttributes(  )
+{
+    auto nSize = maUnknownAttributes.size();
+    if (nSize == 0)
+        return {};
+    Sequence< Attribute > aSeq( nSize );
+    Attribute* pAttr = aSeq.getArray();
+    for( const auto& rAttr : maUnknownAttributes )
+        rAttr.FillAttribute( pAttr++ );
+    return aSeq;
+}
+Sequence< FastAttribute > FastAttributeList::getFastAttributes(  )
+{
+    Sequence< FastAttribute > aSeq( maAttributeTokens.size() );
+    FastAttribute* pAttr = aSeq.getArray();
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+    {
+        pAttr->Token = maAttributeTokens[i];
+        pAttr->Value = getValueByIndex(i);
+        pAttr++;
+    }
+    return aSeq;
+}
+
+FastAttributeList::FastAttributeIter FastAttributeList::find( sal_Int32 nToken ) const
+{
+    for (size_t i = 0, n = maAttributeTokens.size(); i < n; ++i)
+        if( maAttributeTokens[i] == nToken )
+            return FastAttributeIter(*this, i);
+    return end();
+}
+
+sal_Int32 FastTokenHandlerBase::getTokenFromChars(
+        const FastTokenHandlerBase *pTokenHandler,
+        std::string_view token )
+{
+    return pTokenHandler->getTokenDirect(token.data(), token.size());
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/fastserializer.cxx b/sax/source/tools/fastserializer.cxx
new file mode 100644
index 0000000000..0a5c227b72
--- /dev/null
+++ b/sax/source/tools/fastserializer.cxx
@@ -0,0 +1,844 @@
+/* -*- 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 "fastserializer.hxx"
+
+#include <com/sun/star/xml/sax/FastTokenHandler.hpp>
+#include <rtl/math.h>
+#include <sal/log.hxx>
+#include <comphelper/processfactory.hxx>
+
+#include <cassert>
+#include <optional>
+#include <string.h>
+#include <string_view>
+#include <utility>
+
+#if OSL_DEBUG_LEVEL > 0
+#include <iostream>
+#include <set>
+#endif
+
+using ::std::vector;
+using ::com::sun::star::uno::Sequence;
+using ::com::sun::star::io::XOutputStream;
+
+#define HAS_NAMESPACE(x) ((x & 0xffff0000) != 0)
+#define NAMESPACE(x) (x >> 16)
+#define TOKEN(x) (x & 0xffff)
+// number of characters without terminating 0
+#define N_CHARS(string) (SAL_N_ELEMENTS(string) - 1)
+
+const char sClosingBracket[] = ">";
+const char sSlashAndClosingBracket[] = "/>";
+constexpr OString sColon = ":"_ostr;
+const char sOpeningBracket[] = "<";
+const char sOpeningBracketAndSlash[] = "</";
+const char sQuote[] = "\"";
+const char sEqualSignAndQuote[] = "=\"";
+const char sSpace[] = " ";
+const char sXmlHeader[] = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n";
+
+namespace sax_fastparser {
+    FastSaxSerializer::FastSaxSerializer( const css::uno::Reference< css::io::XOutputStream >& xOutputStream )
+        : mbMarkStackEmpty(true)
+        , mpDoubleStr(nullptr)
+        , mnDoubleStrCapacity(RTL_STR_MAX_VALUEOFDOUBLE)
+        , mbXescape(true)
+    {
+        rtl_string_new_WithLength(&mpDoubleStr, mnDoubleStrCapacity);
+        mxFastTokenHandler = css::xml::sax::FastTokenHandler::create(
+                ::comphelper::getProcessComponentContext());
+        assert(xOutputStream.is()); // cannot do anything without that
+        maCachedOutputStream.setOutputStream( xOutputStream );
+    }
+
+    FastSaxSerializer::~FastSaxSerializer()
+    {
+        rtl_string_release(mpDoubleStr);
+    }
+
+    void FastSaxSerializer::startDocument()
+    {
+        writeBytes(sXmlHeader, N_CHARS(sXmlHeader));
+    }
+
+    void FastSaxSerializer::write( double value )
+    {
+        rtl_math_doubleToString(
+            &mpDoubleStr, &mnDoubleStrCapacity, 0, value, rtl_math_StringFormat_G,
+            RTL_STR_MAX_VALUEOFDOUBLE - RTL_CONSTASCII_LENGTH("-x.E-xxx"), '.', nullptr,
+            0, true);
+
+        write(mpDoubleStr->buffer, mpDoubleStr->length);
+        // and "clear" the string
+        mpDoubleStr->length = 0;
+        mnDoubleStrCapacity = RTL_STR_MAX_VALUEOFDOUBLE;
+    }
+
+    void FastSaxSerializer::write( std::u16string_view sOutput, bool bEscape )
+    {
+        write( OUStringToOString(sOutput, RTL_TEXTENCODING_UTF8), bEscape );
+
+    }
+
+    void FastSaxSerializer::write( std::string_view sOutput, bool bEscape )
+    {
+        write( sOutput.data(), sOutput.length(), bEscape );
+    }
+
+    /** Characters not allowed in XML 1.0
+        XML 1.1 would exclude only U+0000
+
+        This assumes that `string` is UTF-8, but which appears to generally be the case:  The only
+        user of this FastSaxSerializer code is FastSerializerHelper, and when its constructor
+        (sax/source/tools/fshelper.cxx) is called with bWriteHeader being true, it calls
+        FastSaxSerializer::startDocument, which writes sXmlHeader claiming encoding="UTF-8".  The
+        only place that appears to construct FastSerializerHelper appears to be
+        XmlFilterBase::openFragmentStreamWithSerializer (oox/source/core/xmlfilterbase.cxx), and it
+        only passes false for bWriteHeader when the given rMediaType contains "vml" but not "+xml"
+        (see <https://git.libreoffice.org/core/+/6a11add2c4ea975356cfb7bab02301788c79c904%5E!/>
+        "XLSX VML Export fixes", stating "Don't write xml headers for vml files").  But lets assume
+        that even such Vector Markup Language files are written as UTF-8.
+     */
+    template<typename Int> static std::optional<std::pair<unsigned, Int>> invalidChar(
+        char const * string, Int length, Int index )
+    {
+        assert(index < length);
+        auto const c = string[index];
+
+        if (static_cast<unsigned char>(c) >= 0x20 && c != '\xEF')
+            return {};
+
+        switch (c)
+        {
+            case 0x09:
+            case 0x0a:
+            case 0x0d:
+                return {};
+            case '\xEF': // U+FFFE, U+FFFF:
+                if (length - index >= 3 && string[index + 1] == '\xBF') {
+                    switch (string[index + 2]) {
+                    case '\xBE':
+                        return std::pair(0xFFFE, 3);
+                    case '\xBF':
+                        return std::pair(0xFFFF, 3);
+                    }
+                }
+                return {};
+        }
+        return std::pair(static_cast<unsigned char>(c), 1);
+    }
+
+    static bool isHexDigit( char c )
+    {
+        return ('0' <= c && c <= '9') || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
+    }
+
+    void FastSaxSerializer::write( const char* pStr, sal_Int32 nLen, bool bEscape )
+    {
+        if (nLen == -1)
+            nLen = pStr ? strlen(pStr) : 0;
+
+        if (!bEscape)
+        {
+            writeBytes( pStr, nLen );
+            return;
+        }
+
+        bool bGood = true;
+        const sal_Int32 kXescapeLen = 7;
+        char bufXescape[kXescapeLen+1];
+        sal_Int32 nNextXescape = 0;
+        for (sal_Int32 i = 0; i < nLen;)
+        {
+            char c = pStr[ i ];
+            switch( c )
+            {
+                case '<':   writeBytes( "&lt;", 4 );     break;
+                case '>':   writeBytes( "&gt;", 4 );     break;
+                case '&':   writeBytes( "&amp;", 5 );    break;
+                case '\'':  writeBytes( "&apos;", 6 );   break;
+                case '"':   writeBytes( "&quot;", 6 );   break;
+                case '\t':
+#if 0
+                            // Seems OOXML prefers the _xHHHH_ escape over the
+                            // entity in *some* cases, apparently in attribute
+                            // values but not in element data.
+                            // Would need to distinguish at a higher level.
+                            if (mbXescape)
+                            {
+                                snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
+                                        static_cast<unsigned int>(static_cast<unsigned char>(c)));
+                                writeBytes( bufXescape, kXescapeLen);
+                            }
+                            else
+#endif
+                            {
+                                writeBytes( "&#9;", 4 );
+                            }
+                break;
+                case '\n':
+#if 0
+                            if (mbXescape)
+                            {
+                                snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
+                                        static_cast<unsigned int>(static_cast<unsigned char>(c)));
+                                writeBytes( bufXescape, kXescapeLen);
+                            }
+                            else
+#endif
+                            {
+                                writeBytes( "&#10;", 5 );
+                            }
+                break;
+                case '\r':
+#if 0
+                            if (mbXescape)
+                            {
+                                snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
+                                        static_cast<unsigned int>(static_cast<unsigned char>(c)));
+                                writeBytes( bufXescape, kXescapeLen);
+                            }
+                            else
+#endif
+                            {
+                                writeBytes( "&#13;", 5 );
+                            }
+                break;
+                default:
+                            if (mbXescape)
+                            {
+                                char c1, c2, c3, c4;
+                                // Escape characters not valid in XML 1.0 as
+                                // _xHHHH_. A literal "_xHHHH_" has to be
+                                // escaped as _x005F_xHHHH_ (effectively
+                                // escaping the leading '_').
+                                // See ECMA-376-1:2016 page 3736,
+                                // 22.4.2.4 bstr (Basic String)
+                                // for reference.
+                                if (c == '_' && i >= nNextXescape && i <= nLen - kXescapeLen &&
+                                        pStr[i+6] == '_' &&
+                                        ((pStr[i+1] | 0x20) == 'x') &&
+                                        isHexDigit( c1 = pStr[i+2] ) &&
+                                        isHexDigit( c2 = pStr[i+3] ) &&
+                                        isHexDigit( c3 = pStr[i+4] ) &&
+                                        isHexDigit( c4 = pStr[i+5] ))
+                                {
+                                    // OOXML has the odd habit to write some
+                                    // names using this that when re-saving
+                                    // should *not* be escaped, specifically
+                                    // _x0020_ for blanks in w:xpath values.
+                                    if (!(c1 == '0' && c2 == '0' && c3 == '2' && c4 == '0'))
+                                    {
+                                        // When encountering "_x005F_xHHHH_"
+                                        // assume that is an already escaped
+                                        // sequence that was not unescaped and
+                                        // shall be written as is, to not end
+                                        // up with "_x005F_x005F_xHHHH_" and
+                                        // repeated...
+                                        if (c1 == '0' && c2 == '0' && c3 == '5' && (c4 | 0x20) == 'f' &&
+                                                i + kXescapeLen <= nLen - 6 &&
+                                                pStr[i+kXescapeLen+5] == '_' &&
+                                                ((pStr[i+kXescapeLen+0] | 0x20) == 'x') &&
+                                                isHexDigit( pStr[i+kXescapeLen+1] ) &&
+                                                isHexDigit( pStr[i+kXescapeLen+2] ) &&
+                                                isHexDigit( pStr[i+kXescapeLen+3] ) &&
+                                                isHexDigit( pStr[i+kXescapeLen+4] ))
+                                        {
+                                            writeBytes( &c, 1 );
+                                            // Remember this fake escapement.
+                                            nNextXescape = i + kXescapeLen + 6;
+                                        }
+                                        else
+                                        {
+                                            writeBytes( "_x005F_", kXescapeLen);
+                                            // Remember this escapement so in
+                                            // _xHHHH_xHHHH_ only the first '_'
+                                            // is escaped.
+                                            nNextXescape = i + kXescapeLen;
+                                        }
+                                        break;
+                                    }
+                                }
+                                if (auto const inv = invalidChar(pStr, nLen, i))
+                                {
+                                    snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
+                                            inv->first);
+                                    writeBytes( bufXescape, kXescapeLen);
+                                    i += inv->second;
+                                    continue;
+                                }
+                            }
+#if OSL_DEBUG_LEVEL > 0
+                            else
+                            {
+                                if (bGood && invalidChar(pStr, nLen, i))
+                                {
+                                    bGood = false;
+                                    // The SAL_WARN() for the single character is
+                                    // issued in writeBytes(), just gather for the
+                                    // SAL_WARN_IF() below.
+                                }
+                            }
+#endif
+                            writeBytes( &c, 1 );
+                break;
+            }
+            ++i;
+        }
+        SAL_WARN_IF( !bGood && nLen > 1, "sax", "in '" << OString(pStr,std::min<sal_Int32>(nLen,42)) << "'");
+    }
+
+    void FastSaxSerializer::endDocument()
+    {
+        assert(mbMarkStackEmpty && maMarkStack.empty());
+        maCachedOutputStream.flush();
+    }
+
+    void FastSaxSerializer::writeId( ::sal_Int32 nElement )
+    {
+        if( HAS_NAMESPACE( nElement ) ) {
+            auto const Namespace(mxFastTokenHandler->getUTF8Identifier(NAMESPACE(nElement)));
+            assert(Namespace.hasElements());
+            writeBytes(Namespace);
+            writeBytes(sColon.getStr(), sColon.getLength());
+            auto const Element(mxFastTokenHandler->getUTF8Identifier(TOKEN(nElement)));
+            assert(Element.hasElements());
+            writeBytes(Element);
+        } else {
+            auto const Element(mxFastTokenHandler->getUTF8Identifier(nElement));
+            assert(Element.hasElements());
+            writeBytes(Element);
+        }
+    }
+
+#ifdef DBG_UTIL
+    OString FastSaxSerializer::getId( ::sal_Int32 nElement )
+    {
+        if (HAS_NAMESPACE(nElement)) {
+            Sequence<sal_Int8> const ns(
+                mxFastTokenHandler->getUTF8Identifier(NAMESPACE(nElement)));
+            Sequence<sal_Int8> const name(
+                mxFastTokenHandler->getUTF8Identifier(TOKEN(nElement)));
+            return std::string_view(
+                     reinterpret_cast<char const*>(ns.getConstArray()), ns.getLength())
+                 + sColon
+                 + std::string_view(
+                     reinterpret_cast<char const*>(name.getConstArray()), name.getLength());
+        } else {
+            Sequence<sal_Int8> const name(
+                mxFastTokenHandler->getUTF8Identifier(nElement));
+            return OString(reinterpret_cast<char const*>(name.getConstArray()), name.getLength());
+        }
+    }
+#endif
+
+    void FastSaxSerializer::startFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList )
+    {
+        if ( !mbMarkStackEmpty )
+        {
+            maCachedOutputStream.flush();
+            maMarkStack.top()->setCurrentElement( Element );
+        }
+
+#ifdef DBG_UTIL
+        if (mbMarkStackEmpty)
+            m_DebugStartedElements.push(Element);
+        else
+            maMarkStack.top()->m_DebugStartedElements.push_back(Element);
+#endif
+
+        writeBytes(sOpeningBracket, N_CHARS(sOpeningBracket));
+
+        writeId(Element);
+        if (pAttrList)
+            writeFastAttributeList(*pAttrList);
+        else
+            writeTokenValueList();
+
+        writeBytes(sClosingBracket, N_CHARS(sClosingBracket));
+    }
+
+    void FastSaxSerializer::endFastElement( ::sal_Int32 Element )
+    {
+#ifdef DBG_UTIL
+        // Well-formedness constraint: Element Type Match
+        if (mbMarkStackEmpty)
+        {
+            assert(!m_DebugStartedElements.empty());
+            assert(Element == m_DebugStartedElements.top());
+            m_DebugStartedElements.pop();
+        }
+        else
+        {
+            if (dynamic_cast<ForSort*>(maMarkStack.top().get()))
+            {
+                // Sort is always well-formed fragment
+                assert(!maMarkStack.top()->m_DebugStartedElements.empty());
+            }
+            if (maMarkStack.top()->m_DebugStartedElements.empty())
+            {
+                maMarkStack.top()->m_DebugEndedElements.push_back(Element);
+            }
+            else
+            {
+                assert(Element == maMarkStack.top()->m_DebugStartedElements.back());
+                maMarkStack.top()->m_DebugStartedElements.pop_back();
+            }
+        }
+#endif
+
+        writeBytes(sOpeningBracketAndSlash, N_CHARS(sOpeningBracketAndSlash));
+
+        writeId(Element);
+
+        writeBytes(sClosingBracket, N_CHARS(sClosingBracket));
+    }
+
+    void FastSaxSerializer::singleFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList )
+    {
+        if ( !mbMarkStackEmpty )
+        {
+            maCachedOutputStream.flush();
+            maMarkStack.top()->setCurrentElement( Element );
+        }
+
+        writeBytes(sOpeningBracket, N_CHARS(sOpeningBracket));
+
+        writeId(Element);
+        if (pAttrList)
+            writeFastAttributeList(*pAttrList);
+        else
+            writeTokenValueList();
+
+        writeBytes(sSlashAndClosingBracket, N_CHARS(sSlashAndClosingBracket));
+    }
+
+    css::uno::Reference< css::io::XOutputStream > const & FastSaxSerializer::getOutputStream() const
+    {
+        return maCachedOutputStream.getOutputStream();
+    }
+
+    void FastSaxSerializer::writeTokenValueList()
+    {
+#ifdef DBG_UTIL
+        ::std::set<OString> DebugAttributes;
+#endif
+        for (const TokenValue & rTokenValue : maTokenValues)
+        {
+            writeBytes(sSpace, N_CHARS(sSpace));
+
+            sal_Int32 nToken = rTokenValue.nToken;
+            writeId(nToken);
+
+#ifdef DBG_UTIL
+            // Well-formedness constraint: Unique Att Spec
+            OString const nameId(getId(nToken));
+            assert(DebugAttributes.find(nameId) == DebugAttributes.end());
+            DebugAttributes.insert(nameId);
+#endif
+
+            writeBytes(sEqualSignAndQuote, N_CHARS(sEqualSignAndQuote));
+
+            write(rTokenValue.pValue, -1, true);
+
+            writeBytes(sQuote, N_CHARS(sQuote));
+        }
+        maTokenValues.clear();
+    }
+
+    void FastSaxSerializer::writeFastAttributeList(FastAttributeList const & rAttrList)
+    {
+#ifdef DBG_UTIL
+        ::std::set<OString> DebugAttributes;
+#endif
+        const std::vector< sal_Int32 >& Tokens = rAttrList.getFastAttributeTokens();
+        for (size_t j = 0; j < Tokens.size(); j++)
+        {
+            writeBytes(sSpace, N_CHARS(sSpace));
+
+            sal_Int32 nToken = Tokens[j];
+            writeId(nToken);
+
+#ifdef DBG_UTIL
+            // Well-formedness constraint: Unique Att Spec
+            OString const nameId(getId(nToken));
+            SAL_WARN_IF(DebugAttributes.find(nameId) != DebugAttributes.end(),  "sax", "Duplicate attribute: " << nameId );
+            assert(DebugAttributes.find(nameId) == DebugAttributes.end());
+            DebugAttributes.insert(nameId);
+#endif
+
+            writeBytes(sEqualSignAndQuote, N_CHARS(sEqualSignAndQuote));
+
+            const char* pAttributeValue = rAttrList.getFastAttributeValue(j);
+
+            // tdf#117274 don't escape the special VML shape type id "#_x0000_t202"
+            bool bEscape = !(pAttributeValue
+                    && *pAttributeValue != '\0'
+                    && (*pAttributeValue == '#'
+                        ? strncmp(pAttributeValue, "#_x0000_t", 9) == 0
+                        : strncmp(pAttributeValue, "_x0000_t", 8) == 0));
+
+            write(pAttributeValue, rAttrList.AttributeValueLength(j), bEscape);
+
+            writeBytes(sQuote, N_CHARS(sQuote));
+        }
+    }
+
+    void FastSaxSerializer::mark(sal_Int32 const nTag, const Int32Sequence& rOrder)
+    {
+        if (rOrder.hasElements())
+        {
+            auto pSort = std::make_shared<ForSort>(nTag, rOrder);
+            maMarkStack.push( pSort );
+            maCachedOutputStream.setOutput( pSort );
+        }
+        else
+        {
+            auto pMerge = std::make_shared<ForMerge>(nTag);
+            maMarkStack.push( pMerge );
+            maCachedOutputStream.setOutput( pMerge );
+        }
+        mbMarkStackEmpty = false;
+    }
+
+#ifdef DBG_UTIL
+    static void lcl_DebugMergeAppend(
+            std::deque<sal_Int32> & rLeftEndedElements,
+            std::deque<sal_Int32> & rLeftStartedElements,
+            std::deque<sal_Int32> & rRightEndedElements,
+            std::deque<sal_Int32> & rRightStartedElements)
+    {
+        while (!rRightEndedElements.empty())
+        {
+            if (rLeftStartedElements.empty())
+            {
+                rLeftEndedElements.push_back(rRightEndedElements.front());
+            }
+            else
+            {
+                assert(rLeftStartedElements.back() == rRightEndedElements.front());
+                rLeftStartedElements.pop_back();
+            }
+            rRightEndedElements.pop_front();
+        }
+        while (!rRightStartedElements.empty())
+        {
+            rLeftStartedElements.push_back(rRightStartedElements.front());
+            rRightStartedElements.pop_front();
+        }
+    }
+
+    static void lcl_DebugMergePrepend(
+            std::deque<sal_Int32> & rLeftEndedElements,
+            std::deque<sal_Int32> & rLeftStartedElements,
+            std::deque<sal_Int32> & rRightEndedElements,
+            std::deque<sal_Int32> & rRightStartedElements)
+    {
+        while (!rLeftStartedElements.empty())
+        {
+            if (rRightEndedElements.empty())
+            {
+                rRightStartedElements.push_front(rLeftStartedElements.back());
+            }
+            else
+            {
+                assert(rRightEndedElements.front() == rLeftStartedElements.back());
+                rRightEndedElements.pop_front();
+            }
+            rLeftStartedElements.pop_back();
+        }
+        while (!rLeftEndedElements.empty())
+        {
+            rRightEndedElements.push_front(rLeftEndedElements.back());
+            rLeftEndedElements.pop_back();
+        }
+    }
+#endif
+
+    void FastSaxSerializer::mergeTopMarks(
+        sal_Int32 const nTag, sax_fastparser::MergeMarks const eMergeType)
+    {
+        SAL_WARN_IF(mbMarkStackEmpty, "sax", "Empty mark stack - nothing to merge");
+        assert(!mbMarkStackEmpty); // should never happen
+        if ( mbMarkStackEmpty )
+            return;
+
+        assert(maMarkStack.top()->m_Tag == nTag && "mark/merge tag mismatch!");
+        (void) nTag;
+#ifdef DBG_UTIL
+        if (dynamic_cast<ForSort*>(maMarkStack.top().get()))
+        {
+            // Sort is always well-formed fragment
+            assert(maMarkStack.top()->m_DebugStartedElements.empty());
+            assert(maMarkStack.top()->m_DebugEndedElements.empty());
+        }
+        lcl_DebugMergeAppend(
+            maMarkStack.top()->m_DebugEndedElements,
+            maMarkStack.top()->m_DebugStartedElements,
+            maMarkStack.top()->m_DebugPostponedEndedElements,
+            maMarkStack.top()->m_DebugPostponedStartedElements);
+#endif
+
+        // flush, so that we get everything in getData()
+        maCachedOutputStream.flush();
+
+        if (maMarkStack.size() == 1)
+        {
+#ifdef DBG_UTIL
+            while (!maMarkStack.top()->m_DebugEndedElements.empty())
+            {
+                assert(maMarkStack.top()->m_DebugEndedElements.front() == m_DebugStartedElements.top());
+                maMarkStack.top()->m_DebugEndedElements.pop_front();
+                m_DebugStartedElements.pop();
+            }
+            while (!maMarkStack.top()->m_DebugStartedElements.empty())
+            {
+                m_DebugStartedElements.push(maMarkStack.top()->m_DebugStartedElements.front());
+                maMarkStack.top()->m_DebugStartedElements.pop_front();
+            }
+#endif
+            Sequence<sal_Int8> aSeq( maMarkStack.top()->getData() );
+            maMarkStack.pop();
+            mbMarkStackEmpty = true;
+            maCachedOutputStream.resetOutputToStream();
+            maCachedOutputStream.writeBytes( aSeq.getConstArray(), aSeq.getLength() );
+            return;
+        }
+
+#ifdef DBG_UTIL
+        ::std::deque<sal_Int32> topDebugStartedElements(maMarkStack.top()->m_DebugStartedElements);
+        ::std::deque<sal_Int32> topDebugEndedElements(maMarkStack.top()->m_DebugEndedElements);
+#endif
+        const Int8Sequence aMerge( maMarkStack.top()->getData() );
+        maMarkStack.pop();
+#ifdef DBG_UTIL
+        switch (eMergeType)
+        {
+            case MergeMarks::APPEND:
+                lcl_DebugMergeAppend(
+                    maMarkStack.top()->m_DebugEndedElements,
+                    maMarkStack.top()->m_DebugStartedElements,
+                    topDebugEndedElements,
+                    topDebugStartedElements);
+                break;
+            case MergeMarks::PREPEND:
+                if (dynamic_cast<ForSort*>(maMarkStack.top().get())) // argh...
+                {
+                    lcl_DebugMergeAppend(
+                        maMarkStack.top()->m_DebugEndedElements,
+                        maMarkStack.top()->m_DebugStartedElements,
+                        topDebugEndedElements,
+                        topDebugStartedElements);
+                }
+                else
+                {
+                    lcl_DebugMergePrepend(
+                        topDebugEndedElements,
+                        topDebugStartedElements,
+                        maMarkStack.top()->m_DebugEndedElements,
+                        maMarkStack.top()->m_DebugStartedElements);
+                }
+                break;
+            case MergeMarks::POSTPONE:
+                lcl_DebugMergeAppend(
+                    maMarkStack.top()->m_DebugPostponedEndedElements,
+                    maMarkStack.top()->m_DebugPostponedStartedElements,
+                    topDebugEndedElements,
+                    topDebugStartedElements);
+                break;
+        }
+#endif
+        if (maMarkStack.empty())
+        {
+            mbMarkStackEmpty = true;
+            maCachedOutputStream.resetOutputToStream();
+        }
+        else
+        {
+            maCachedOutputStream.setOutput( maMarkStack.top() );
+        }
+
+        switch ( eMergeType )
+        {
+            case MergeMarks::APPEND:   maMarkStack.top()->append( aMerge );   break;
+            case MergeMarks::PREPEND:  maMarkStack.top()->prepend( aMerge );  break;
+            case MergeMarks::POSTPONE: maMarkStack.top()->postpone( aMerge ); break;
+        }
+    }
+
+    void FastSaxSerializer::writeBytes( const Sequence< sal_Int8 >& rData )
+    {
+        maCachedOutputStream.writeBytes( rData.getConstArray(), rData.getLength() );
+    }
+
+    void FastSaxSerializer::writeBytes( const char* pStr, size_t nLen )
+    {
+#if OSL_DEBUG_LEVEL > 0
+        {
+            bool bGood = true;
+            for (size_t i=0; i < nLen;)
+            {
+                if (auto const inv = invalidChar(pStr, nLen, i))
+                {
+                    bGood = false;
+                    SAL_WARN("sax", "FastSaxSerializer::writeBytes - illegal XML character 0x" <<
+                            std::hex << inv->first);
+                    i += inv->second;
+                    continue;
+                }
+                ++i;
+            }
+            SAL_WARN_IF( !bGood && nLen > 1, "sax", "in '" << OString(pStr,std::min<sal_Int32>(nLen,42)) << "'");
+        }
+#endif
+        maCachedOutputStream.writeBytes( reinterpret_cast<const sal_Int8*>(pStr), nLen );
+    }
+
+    FastSaxSerializer::Int8Sequence& FastSaxSerializer::ForMerge::getData()
+    {
+        merge( maData, maPostponed, true );
+        maPostponed.realloc( 0 );
+
+        return maData;
+    }
+
+#if OSL_DEBUG_LEVEL > 0
+    void FastSaxSerializer::ForMerge::print( )
+    {
+        std::cerr << "Data: ";
+        for ( sal_Int32 i=0, len=maData.getLength(); i < len; i++ )
+        {
+            std::cerr << maData[i];
+        }
+
+        std::cerr << "\nPostponed: ";
+        for ( sal_Int32 i=0, len=maPostponed.getLength(); i < len; i++ )
+        {
+            std::cerr << maPostponed[i];
+        }
+
+        std::cerr << "\n";
+    }
+#endif
+
+    void FastSaxSerializer::ForMerge::prepend( const Int8Sequence &rWhat )
+    {
+        merge( maData, rWhat, false );
+    }
+
+    void FastSaxSerializer::ForMerge::append( const css::uno::Sequence<sal_Int8> &rWhat )
+    {
+        merge( maData, rWhat, true );
+    }
+
+    void FastSaxSerializer::ForMerge::postpone( const Int8Sequence &rWhat )
+    {
+        merge( maPostponed, rWhat, true );
+    }
+
+    void FastSaxSerializer::ForMerge::merge( Int8Sequence &rTop, const Int8Sequence &rMerge, bool bAppend )
+    {
+        sal_Int32 nMergeLen = rMerge.getLength();
+        if ( nMergeLen <= 0 )
+            return;
+
+        sal_Int32 nTopLen = rTop.getLength();
+
+        rTop.realloc( nTopLen + nMergeLen );
+        if ( bAppend )
+        {
+            // append the rMerge to the rTop
+            memcpy( rTop.getArray() + nTopLen, rMerge.getConstArray(), nMergeLen );
+        }
+        else
+        {
+            // prepend the rMerge to the rTop
+            memmove( rTop.getArray() + nMergeLen, rTop.getConstArray(), nTopLen );
+            memcpy( rTop.getArray(), rMerge.getConstArray(), nMergeLen );
+        }
+    }
+
+    void FastSaxSerializer::ForMerge::resetData( )
+    {
+        maData = Int8Sequence();
+    }
+
+    void FastSaxSerializer::ForSort::setCurrentElement( sal_Int32 nElement )
+    {
+        const auto & rOrder = maOrder;
+        if( std::find( rOrder.begin(), rOrder.end(), nElement ) != rOrder.end() )
+        {
+            mnCurrentElement = nElement;
+            if ( maData.find( nElement ) == maData.end() )
+                maData[ nElement ] = Int8Sequence();
+        }
+    }
+
+    void FastSaxSerializer::ForSort::prepend( const Int8Sequence &rWhat )
+    {
+        append( rWhat );
+    }
+
+    void FastSaxSerializer::ForSort::append( const css::uno::Sequence<sal_Int8> &rWhat )
+    {
+        merge( maData[mnCurrentElement], rWhat, true );
+    }
+
+    void FastSaxSerializer::ForSort::sort()
+    {
+        // Clear the ForMerge data to avoid duplicate items
+        resetData();
+
+        // Sort it all
+        std::map< sal_Int32, Int8Sequence >::iterator iter;
+        for ( const auto nIndex : std::as_const(maOrder) )
+        {
+            iter = maData.find( nIndex );
+            if ( iter != maData.end() )
+                ForMerge::append( iter->second );
+        }
+    }
+
+    FastSaxSerializer::Int8Sequence& FastSaxSerializer::ForSort::getData()
+    {
+        sort( );
+        return ForMerge::getData();
+    }
+
+#if OSL_DEBUG_LEVEL > 0
+    void FastSaxSerializer::ForSort::print( )
+    {
+        for ( const auto& [rElement, rData] : maData )
+        {
+            std::cerr << "pair: " << rElement;
+            for ( sal_Int32 i=0, len=rData.getLength(); i < len; ++i )
+                std::cerr << rData[i];
+            std::cerr << "\n";
+        }
+
+        sort( );
+        ForMerge::print();
+    }
+#endif
+
+} // namespace sax_fastparser
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/fastserializer.hxx b/sax/source/tools/fastserializer.hxx
new file mode 100644
index 0000000000..8d97caf305
--- /dev/null
+++ b/sax/source/tools/fastserializer.hxx
@@ -0,0 +1,257 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_SAX_SOURCE_TOOLS_FASTSERIALIZER_HXX
+#define INCLUDED_SAX_SOURCE_TOOLS_FASTSERIALIZER_HXX
+
+#include <com/sun/star/xml/sax/XFastTokenHandler.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+
+#include <sax/fastattribs.hxx>
+#include <sax/fshelper.hxx>
+#include "CachedOutputStream.hxx"
+
+#include <stack>
+#include <string_view>
+#include <map>
+#include <memory>
+
+namespace sax_fastparser {
+
+struct TokenValue
+{
+    sal_Int32   nToken;
+    const char *pValue;
+    TokenValue(sal_Int32 _nToken, const char *_pValue) : nToken(_nToken), pValue(_pValue) {}
+};
+typedef std::vector<TokenValue> TokenValueList;
+
+/// Receives notification of sax document events to write into an XOutputStream.
+class FastSaxSerializer
+{
+    typedef css::uno::Sequence< ::sal_Int8 > Int8Sequence;
+    typedef css::uno::Sequence< ::sal_Int32 > Int32Sequence;
+
+public:
+    explicit FastSaxSerializer(const css::uno::Reference< css::io::XOutputStream >& xOutputStream);
+    ~FastSaxSerializer();
+
+    css::uno::Reference< css::io::XOutputStream > const & getOutputStream() const;
+    /// called by FSHelper to put data in for writeTokenValueList
+    TokenValueList& getTokenValueList() { return maTokenValues; }
+
+    /** called by the parser when parsing of an XML stream is started.
+     */
+    void startDocument();
+
+    /** called by the parser after the last XML element of a stream is processed.
+     */
+    void endDocument();
+
+    /** receives notification of the beginning of an element.
+
+        @param Element
+            contains the integer token from the <type>XFastTokenHandler</type>
+            registered at the <type>XFastParser</type>.<br>
+
+            If the element has a namespace that was registered with the
+            <type>XFastParser</type>, <param>Element</param> contains the integer
+            token of the elements local name from the <type>XFastTokenHandler</type>
+            and the integer token of the namespace combined with an arithmetic
+            <b>or</b> operation.
+
+        @param pAttrList
+            Contains a <type>FastAttributeList</type> to access the attributes
+            from the element.
+
+    */
+    void startFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList = nullptr );
+
+    /** receives notification of the end of a known element.
+        @see startFastElement
+     */
+    void endFastElement( ::sal_Int32 Element );
+
+    /** receives notification of the beginning of a single element.
+
+        @param Element
+            contains the integer token from the <type>XFastTokenHandler</type>
+            registered at the <type>XFastParser</type>.<br>
+
+            If the element has a namespace that was registered with the
+            <type>XFastParser</type>, <param>Element</param> contains the integer
+            token of the elements local name from the <type>XFastTokenHandler</type>
+            and the integer token of the namespace combined with an arithmetic
+            <b>or</b> operation.
+
+        @param pAttrList
+            Contains a <type>FastAttributeList</type> to access the attributes
+            from the element.
+
+    */
+    void singleFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList = nullptr );
+
+    // C++ helpers
+    void writeId( ::sal_Int32 Element );
+    OString getId( ::sal_Int32 Element );
+
+    void write( double value );
+    void write( std::u16string_view s, bool bEscape = false );
+    void write( std::string_view s, bool bEscape = false );
+    void write( const char* pStr, sal_Int32 nLen, bool bEscape = false );
+
+    // strings with _xHHHH_ are escaped with _x005F unless this is disabled
+    void setAllowXEscape(bool bSet) { mbXescape = bSet; }
+
+public:
+    /** From now on, don't write directly to the stream, but to top of a stack.
+
+        This is to be able to change the order of the data being written.
+        If you need to write eg.
+          p, r, rPr, [something], /rPr, t, [text], /t, /r, /p,
+        but get it in order
+          p, r, t, [text], /t, rPr, [something], /rPr, /r, /p,
+        simply do
+          p, r, mark(), t, [text], /t, mark(), rPr, [something], /rPr,
+          mergeTopMarks( MergeMarks::PREPEND ), mergeTopMarks( MergeMarks::APPEND ), /r, /p
+        and you are done.
+
+        @param nTag debugging aid to ensure mark and merge match in LIFO order
+     */
+    void mark(sal_Int32 nTag, const Int32Sequence& rOrder);
+
+    /** Merge 2 topmost marks.
+
+        The possibilities: prepend the top before the second top-most
+        mark, append it, append it later or ignore; prepending brings the possibility
+        to switch parts of the output, appending later allows to write some
+        output in advance.
+
+        Writes the result to the output stream if the mark stack becomes empty
+        by the operation.
+
+        When the MergeMarks::POSTPONE is specified, the merge happens just
+        before the next merge.
+
+        @param nTag debugging aid to ensure mark and merge match in LIFO order
+
+        @see mark()
+     */
+    void mergeTopMarks(sal_Int32 nTag,
+        sax_fastparser::MergeMarks eMergeType);
+
+private:
+    /** Helper class to cache data and write in chunks to XOutputStream or ForMerge::append.
+     *  Its flush method needs to be called before touching maMarkStack
+     *  to ensure correct order of ForSort methods.
+     */
+    CachedOutputStream maCachedOutputStream;
+    css::uno::Reference< css::xml::sax::XFastTokenHandler > mxFastTokenHandler;
+
+    class ForMerge : public ForMergeBase
+    {
+        Int8Sequence maData;
+        Int8Sequence maPostponed;
+
+    public:
+        sal_Int32 const m_Tag;
+#ifdef DBG_UTIL
+        // pending close tags, followed by pending open tags
+        std::deque<sal_Int32> m_DebugEndedElements;
+        std::deque<sal_Int32> m_DebugStartedElements;
+        // ... and another buffer for maPostponed ...
+        std::deque<sal_Int32> m_DebugPostponedEndedElements;
+        std::deque<sal_Int32> m_DebugPostponedStartedElements;
+#endif
+
+        explicit ForMerge(sal_Int32 const nTag) : m_Tag(nTag) {}
+
+        virtual void setCurrentElement( ::sal_Int32 /*nToken*/ ) {}
+        virtual Int8Sequence& getData();
+#if OSL_DEBUG_LEVEL > 0
+        virtual void print();
+#endif
+
+        virtual void prepend( const Int8Sequence &rWhat );
+        virtual void append( const css::uno::Sequence<sal_Int8> &rWhat ) override;
+        void postpone( const Int8Sequence &rWhat );
+
+    protected:
+        void resetData( );
+        static void merge( Int8Sequence &rTop, const Int8Sequence &rMerge, bool bAppend );
+    };
+
+    class ForSort : public ForMerge
+    {
+        std::map< ::sal_Int32, Int8Sequence > maData;
+        sal_Int32 mnCurrentElement;
+
+        Int32Sequence maOrder;
+
+    public:
+        ForSort(sal_Int32 const nTag, const Int32Sequence& rOrder)
+            : ForMerge(nTag)
+            , mnCurrentElement( 0 )
+            , maOrder( rOrder )
+        {}
+
+        void setCurrentElement( ::sal_Int32 nToken ) override;
+
+        virtual Int8Sequence& getData() override;
+
+#if OSL_DEBUG_LEVEL > 0
+        virtual void print() override;
+#endif
+
+        virtual void prepend( const Int8Sequence &rWhat ) override;
+        virtual void append( const css::uno::Sequence<sal_Int8> &rWhat ) override;
+    private:
+        void sort();
+    };
+
+    std::stack< std::shared_ptr< ForMerge > > maMarkStack;
+    bool mbMarkStackEmpty;
+    // Would be better to use OStringBuffer instead of these two
+    // but then we couldn't get the rtl_String* member :-(
+    rtl_String *mpDoubleStr;
+    sal_Int32 mnDoubleStrCapacity;
+    TokenValueList maTokenValues;
+    bool mbXescape;     ///< whether to escape invalid XML characters as _xHHHH_ in write(const char*,sal_Int32,true)
+
+
+#ifdef DBG_UTIL
+    std::stack<sal_Int32> m_DebugStartedElements;
+#endif
+
+    void writeTokenValueList();
+    void writeFastAttributeList(FastAttributeList const & rAttrList);
+
+    /** Forward the call to the output stream, or write to the stack.
+
+        The latter in the case that we are inside a mark().
+     */
+    void writeBytes( const css::uno::Sequence< ::sal_Int8 >& aData );
+    void writeBytes( const char* pStr, size_t nLen );
+};
+
+} // namespace sax_fastparser
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/source/tools/fshelper.cxx b/sax/source/tools/fshelper.cxx
new file mode 100644
index 0000000000..f5945d67a9
--- /dev/null
+++ b/sax/source/tools/fshelper.cxx
@@ -0,0 +1,174 @@
+/* -*- 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/log.hxx>
+#include <sax/fshelper.hxx>
+#include "fastserializer.hxx"
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+namespace sax_fastparser {
+
+FastSerializerHelper::FastSerializerHelper(const Reference< io::XOutputStream >& xOutputStream, bool bWriteHeader ) :
+    mpSerializer(new FastSaxSerializer(xOutputStream))
+{
+    if( bWriteHeader )
+        startDocument();
+}
+
+void FastSerializerHelper::startDocument()
+{
+    mpSerializer->startDocument();
+}
+
+void FastSerializerHelper::endDocument()
+{
+    std::unique_ptr<FastSaxSerializer> xSerializer(std::move(mpSerializer));
+    xSerializer->endDocument();
+}
+
+FastSerializerHelper::~FastSerializerHelper()
+{
+    if (mpSerializer)
+    {
+        assert(false && "call endDocument explicitly before dtor to avoid potential exceptions during dtor");
+        endDocument();
+    }
+}
+
+void FastSerializerHelper::startElement(sal_Int32 elementTokenId)
+{
+    mpSerializer->startFastElement(elementTokenId);
+}
+void FastSerializerHelper::pushAttributeValue(sal_Int32 attribute, const char* value)
+{
+    mpSerializer->getTokenValueList().emplace_back(attribute, value);
+}
+void FastSerializerHelper::pushAttributeValue(sal_Int32 attribute, const OString& value)
+{
+    mpSerializer->getTokenValueList().emplace_back(attribute, value.getStr());
+}
+void FastSerializerHelper::singleElement(sal_Int32 elementTokenId)
+{
+    mpSerializer->singleFastElement(elementTokenId);
+}
+
+void FastSerializerHelper::endElement(sal_Int32 elementTokenId)
+{
+    mpSerializer->endFastElement(elementTokenId);
+}
+
+void FastSerializerHelper::startElement(sal_Int32 elementTokenId, const rtl::Reference<FastAttributeList>& xAttrList)
+{
+    assert(xAttrList);
+    mpSerializer->startFastElement(elementTokenId, xAttrList.get());
+}
+
+void FastSerializerHelper::singleElement(sal_Int32 elementTokenId, const rtl::Reference<FastAttributeList>& xAttrList)
+{
+    assert(xAttrList);
+    mpSerializer->singleFastElement(elementTokenId, xAttrList.get());
+}
+
+FastSerializerHelper* FastSerializerHelper::write(const char* value)
+{
+    mpSerializer->write(value, -1);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::write(const OString& value)
+{
+    mpSerializer->write(value);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::write(std::u16string_view value)
+{
+    mpSerializer->write(value);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::write(sal_Int32 value)
+{
+    mpSerializer->write(OString::number(value));
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::write(sal_Int64 value)
+{
+    mpSerializer->write(OString::number(value));
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::write(double value)
+{
+    mpSerializer->write(value);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::writeEscaped(const char* value)
+{
+    mpSerializer->write(value, -1, true);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::writeEscaped(std::u16string_view value)
+{
+    if (!value.empty())
+        mpSerializer->write(value, true);
+    return this;
+}
+
+FastSerializerHelper* FastSerializerHelper::writeId(sal_Int32 tokenId)
+{
+    mpSerializer->writeId(tokenId);
+    return this;
+}
+
+css::uno::Reference< css::io::XOutputStream > const & FastSerializerHelper::getOutputStream() const
+{
+    return mpSerializer->getOutputStream();
+}
+
+void FastSerializerHelper::mark(
+        sal_Int32 const nTag, const Sequence<sal_Int32>& rOrder)
+{
+    mpSerializer->mark(nTag, rOrder);
+}
+
+void FastSerializerHelper::mergeTopMarks(
+        sal_Int32 const nTag, MergeMarks const eMergeType)
+{
+    mpSerializer->mergeTopMarks(nTag, eMergeType);
+}
+
+rtl::Reference<FastAttributeList> FastSerializerHelper::createAttrList()
+{
+    return new FastAttributeList( nullptr );
+}
+
+void FastSerializerHelper::setAllowXEscape(bool bSet)
+{
+    mpSerializer->setAllowXEscape(bSet);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/test/makefile.mk b/sax/test/makefile.mk
new file mode 100644
index 0000000000..e2ae1546c0
--- /dev/null
+++ b/sax/test/makefile.mk
@@ -0,0 +1,58 @@
+#
+# 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 .
+#
+
+PRJ=..
+
+PRJNAME=extensions
+TARGET=workben
+LIBTARGET=NO
+
+TARGETTYPE=CUI
+ENABLE_EXCEPTIONS=TRUE
+
+# --- Settings -----------------------------------------------------
+
+.INCLUDE :  settings.mk
+# --- Files --------------------------------------------------------
+
+.IF "$(BUILD_TYPE)" == "$(BUILD_TYPE:s/DESKTOP//)"
+
+ALL:
+# nothing
+
+.ENDIF
+
+#
+# std testcomponent
+#
+APP1TARGET = testcomponent
+APP2TARGET = saxdemo
+
+APP1OBJS   = $(OBJ)$/testcomponent.obj
+APP1STDLIBS = 	$(SALLIB) \
+        $(CPPULIB)\
+        $(CPPUHELPERLIB)
+
+APP2OBJS   = $(OBJ)$/saxdemo.obj
+APP2STDLIBS = 	$(SALLIB) \
+        $(CPPULIB) \
+        $(CPPUHELPERLIB)
+
+# --- Targets ------------------------------------------------------
+
+.INCLUDE :  target.mk
diff --git a/sax/test/sax/exports.dxp b/sax/test/sax/exports.dxp
new file mode 100644
index 0000000000..86214860d5
--- /dev/null
+++ b/sax/test/sax/exports.dxp
@@ -0,0 +1,2 @@
+component_getFactory
+component_writeInfo
diff --git a/sax/test/sax/factory.hxx b/sax/test/sax/factory.hxx
new file mode 100644
index 0000000000..688691c9cd
--- /dev/null
+++ b/sax/test/sax/factory.hxx
@@ -0,0 +1,80 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_SAX_TEST_SAX_FACTORY_HXX
+#define INCLUDED_SAX_TEST_SAX_FACTORY_HXX
+
+#include <rtl/strbuf.hxx>
+
+namespace sax_test {
+Reference< XInterface > SAL_CALL OSaxWriterTest_CreateInstance(
+    const Reference< XMultiServiceFactory > & rSMgr ) throw ( Exception );
+OUString    OSaxWriterTest_getServiceName( ) throw();
+OUString    OSaxWriterTest_getImplementationName( ) throw();
+Sequence<OUString> OSaxWriterTest_getSupportedServiceNames( ) throw();
+}
+#define BUILD_ERROR(expr, Message)\
+        {\
+            m_seqErrors.realloc( m_seqErrors.getLength() + 1 ); \
+        m_seqExceptions.realloc(  m_seqExceptions.getLength() + 1 ); \
+        OStringBuffer str(128); \
+        str.append( __FILE__ );\
+        str.append( " " ); \
+        str.append( "(" ); \
+        str.append( OString::valueOf( (sal_Int32)__LINE__) );\
+        str.append(")\n" );\
+        str.append( "[ " ); \
+        str.append( #expr ); \
+        str.append( " ] : " ); \
+        str.append( Message ); \
+        m_seqErrors.getArray()[ m_seqErrors.getLength()-1] =\
+                       OStringToOUString( str.makeStringAndClear() , RTL_TEXTENCODING_ASCII_US ); \
+        }\
+        ((void)0)
+
+
+#define WARNING_ASSERT(expr, Message) \
+        if( ! (expr) ) { \
+            m_seqWarnings.realloc( m_seqErrors.getLength() +1 ); \
+            OStringBuffer str(128);\
+            str.append( __FILE__);\
+            str.append( " "); \
+            str.append( "(" ); \
+            str.append(OString::valueOf( (sal_Int32)__LINE__)) ;\
+            str.append( ")\n");\
+            str.append( "[ " ); \
+            str.append( #expr ); \
+            str.append( " ] : ") ; \
+            str.append( Message); \
+            m_seqWarnings.getArray()[ m_seqWarnings.getLength()-1] =\
+                          OStringToOUString( str.makeStringAndClear() , RTL_TEXTENCODING_ASCII_US ); \
+            return; \
+        }\
+        ((void)0)
+
+#define ERROR_ASSERT(expr, Message) \
+        if( ! (expr) ) { \
+            BUILD_ERROR(expr, Message );\
+            return; \
+        }\
+        ((void)0)
+
+#endif // INCLUDED_SAX_TEST_SAX_FACTORY_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/test/sax/makefile.mk b/sax/test/sax/makefile.mk
new file mode 100644
index 0000000000..9aa5864ca6
--- /dev/null
+++ b/sax/test/sax/makefile.mk
@@ -0,0 +1,52 @@
+#
+# 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 .
+#
+PRJ=..$/..
+
+PRJNAME=extensions
+TARGET=testsax
+USE_DEFFILE=TRUE
+ENABLE_EXCEPTIONS=TRUE
+# --- Settings -----------------------------------------------------
+.INCLUDE :  settings.mk
+
+# --- Files --------------------------------------------------------
+
+
+SLOFILES = 	$(SLO)$/testsax.obj \
+        $(SLO)$/testwriter.obj
+
+SHL1TARGET= $(TARGET)
+SHL1IMPLIB=		i$(TARGET)
+
+SHL1STDLIBS= \
+        $(SALLIB) 	 		\
+        $(CPPULIB) 			\
+        $(CPPUHELPERLIB)
+
+
+SHL1LIBS=		$(SLB)$/$(TARGET).lib
+SHL1DEPN=		makefile.mk $(SHL1LIBS)
+SHL1DEF=		$(MISC)$/$(SHL1TARGET).def
+
+DEF1NAME=		$(SHL1TARGET)
+DEF1EXPORTFILE=	exports.dxp
+
+
+# --- Targets ------------------------------------------------------
+
+.INCLUDE :	target.mk
diff --git a/sax/test/sax/testsax.cxx b/sax/test/sax/testsax.cxx
new file mode 100644
index 0000000000..b6fa70a938
--- /dev/null
+++ b/sax/test/sax/testsax.cxx
@@ -0,0 +1,794 @@
+/* -*- 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 <stdio.h>
+#include <string.h>
+
+#include <osl/time.h>
+#include <osl/diagnose.h>
+
+#include <com/sun/star/test/XSimpleTest.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
+
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::test;
+using namespace ::com::sun::star::registry;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::xml::sax;
+
+// test scenarios
+
+namespace sax_test {
+
+class OSaxParserTest : public WeakImplHelper< XSimpleTest >
+{
+public:
+    explicit OSaxParserTest( const Reference < XMultiServiceFactory > & rFactory ) : m_rFactory( rFactory )
+    {
+    }
+
+    virtual void SAL_CALL testInvariant(
+        const OUString& TestName,
+        const Reference < XInterface >& TestObject)
+        throw ( IllegalArgumentException, RuntimeException);
+
+    virtual sal_Int32 SAL_CALL test(
+        const OUString& TestName,
+        const Reference < XInterface >& TestObject,
+        sal_Int32 hTestHandle)
+        throw ( IllegalArgumentException,RuntimeException);
+
+    virtual sal_Bool SAL_CALL testPassed() throw (RuntimeException);
+    virtual Sequence< OUString > SAL_CALL getErrors() throw (RuntimeException);
+    virtual Sequence< Any > SAL_CALL getErrorExceptions() throw (RuntimeException);
+    virtual Sequence< OUString > SAL_CALL getWarnings() throw (RuntimeException);
+
+private:
+    void testSimple( const Reference < XParser > &r );
+    void testNamespaces( const Reference < XParser > &r );
+    void testFile(  const Reference < XParser > &r );
+    void testEncoding( const Reference < XParser > &rParser );
+    void testPerformance( const Reference < XParser > &rParser );
+
+    Sequence<Any> m_seqExceptions;
+    Sequence<OUString> m_seqErrors;
+    Sequence<OUString>  m_seqWarnings;
+    Reference < XMultiServiceFactory > m_rFactory;
+};
+
+/// @note for external binding
+Reference < XInterface > SAL_CALL OSaxParserTest_CreateInstance( const Reference < XMultiServiceFactory > & rSMgr ) throw(Exception)
+{
+    return getXWeak(new OSaxParserTest( rSMgr ));
+}
+
+OUString     OSaxParserTest_getServiceName( ) throw ()
+{
+    return OUString( "test.com.sun.star.xml.sax.Parser" );
+}
+
+OUString    OSaxParserTest_getImplementationName( ) throw ()
+{
+    return OUString( "test.extensions.xml.sax.Parser");
+}
+
+Sequence<OUString> OSaxParserTest_getSupportedServiceNames( ) throw ()
+{
+    Sequence<OUString> aRet { OSaxParserTest_getImplementationName() };
+    return aRet;
+}
+
+void OSaxParserTest::testInvariant(
+    const OUString& TestName,
+    const Reference < XInterface >& TestObject )
+    throw ( IllegalArgumentException, RuntimeException)
+{
+    if( OUString( "com.sun.star.xml.sax.Parser") == TestName ) {
+        Reference < XParser > parser( TestObject , UNO_QUERY );
+
+        ERROR_ASSERT( parser.is() , "XDataInputStream cannot be queried" );
+    }
+}
+
+sal_Int32 OSaxParserTest::test(
+    const OUString& TestName,
+    const Reference < XInterface >& TestObject,
+    sal_Int32 hTestHandle)
+    throw ( IllegalArgumentException, RuntimeException)
+{
+    if( OUString( "com.sun.star.xml.sax.Parser") == TestName )  {
+        try
+        {
+            if( 0 == hTestHandle ) {
+                testInvariant( TestName , TestObject );
+            }
+            else {
+                Reference < XParser > parser( TestObject , UNO_QUERY );
+
+                if( 1 == hTestHandle ) {
+                    testSimple( parser );
+                }
+                else if( 2 == hTestHandle ) {
+                    testNamespaces( parser );
+                }
+                else if( 3 == hTestHandle ) {
+                    testEncoding( parser );
+                }
+                else if( 4 == hTestHandle ) {
+                    testFile( parser );
+                }
+                else if( 5 == hTestHandle ) {
+                    testPerformance( parser );
+                }
+            }
+        }
+        catch( Exception & e )
+        {
+            OString o = OUStringToOString( e.Message , RTL_TEXTENCODING_ASCII_US);
+            BUILD_ERROR( 0 , o.getStr() );
+        }
+        catch( ... )
+        {
+            BUILD_ERROR( 0 , "unknown exception (Exception is  not base class)" );
+        }
+
+        hTestHandle ++;
+
+        if( hTestHandle >= 6) {
+            // all tests finished.
+            hTestHandle = -1;
+        }
+    }
+    else {
+        BUILD_ERROR( 0 , "service not supported by test." );
+    }
+    return hTestHandle;
+}
+
+sal_Bool OSaxParserTest::testPassed() throw (RuntimeException)
+{
+    return m_seqErrors.getLength() == 0;
+}
+
+Sequence< OUString > OSaxParserTest::getErrors() throw (RuntimeException)
+{
+    return m_seqErrors;
+}
+
+Sequence< Any > OSaxParserTest::getErrorExceptions() throw (RuntimeException)
+{
+    return m_seqExceptions;
+}
+
+Sequence< OUString > OSaxParserTest::getWarnings() throw (RuntimeException)
+{
+    return m_seqWarnings;
+}
+
+Reference < XInputStream > createStreamFromSequence(
+    const Sequence<sal_Int8> seqBytes ,
+    const Reference < XMultiServiceFactory > &xSMgr )
+{
+    Reference < XInterface > xOutStreamService =
+        xSMgr->createInstance("com.sun.star.io.Pipe");
+    OSL_ASSERT( xOutStreamService.is() );
+    Reference< XOutputStream >  rOutStream( xOutStreamService , UNO_QUERY );
+    OSL_ASSERT( rOutStream.is() );
+
+    Reference< XInputStream > rInStream( xOutStreamService , UNO_QUERY );
+    OSL_ASSERT( rInStream.is() );
+
+    rOutStream->writeBytes( seqBytes );
+    rOutStream->flush();
+    rOutStream->closeOutput();
+
+    return rInStream;
+}
+
+Reference< XInputStream > createStreamFromFile(
+    const char *pcFile ,
+    const Reference < XMultiServiceFactory > &xSMgr )
+{
+    FILE *f = fopen( pcFile , "rb" );
+    Reference<  XInputStream >  r;
+
+    if( f ) {
+        fseek( f , 0 , SEEK_END );
+        int nLength = ftell( f );
+        fseek( f , 0 , SEEK_SET );
+
+        Sequence<sal_Int8> seqIn(nLength);
+        fread( seqIn.getArray() , nLength , 1 , f );
+
+        r = createStreamFromSequence( seqIn , xSMgr );
+        fclose( f );
+    }
+    return r;
+}
+
+class TestDocumentHandler :
+    public WeakImplHelper< XExtendedDocumentHandler , XEntityResolver , XErrorHandler >
+{
+public:
+    TestDocumentHandler( const Reference < XMultiServiceFactory >  &r , sal_Bool bPrint )
+      : m_bPrint(bPrint), m_xSMgr(r)
+    {
+    }
+
+    // Error handler
+    virtual void SAL_CALL error(const Any& aSAXParseException) throw (SAXException, RuntimeException)
+    {
+        printf( "Error !\n" );
+        throw  SAXException(
+            OUString( "error from error handler") ,
+            Reference < XInterface >() ,
+            aSAXParseException );
+    }
+    virtual void SAL_CALL fatalError(const Any& aSAXParseException) throw (SAXException, RuntimeException)
+    {
+        printf( "Fatal Error !\n" );
+    }
+    virtual void SAL_CALL warning(const Any& aSAXParseException) throw (SAXException, RuntimeException)
+    {
+        printf( "Warning !\n" );
+    }
+
+    // ExtendedDocumentHandler
+    virtual void SAL_CALL startDocument() throw (SAXException, RuntimeException)
+    {
+         m_iLevel = 0;
+        m_iElementCount = 0;
+        m_iAttributeCount = 0;
+        m_iWhitespaceCount =0;
+        m_iCharCount=0;
+        if( m_bPrint ) {
+            printf( "document started\n" );
+        }
+    }
+    virtual void SAL_CALL endDocument() throw (SAXException, RuntimeException)
+    {
+        if( m_bPrint ) {
+            printf( "document finished\n" );
+            printf( "(ElementCount %d),(AttributeCount %d),(WhitespaceCount %d),(CharCount %d)\n",
+                m_iElementCount, m_iAttributeCount, m_iWhitespaceCount , m_iCharCount );
+        }
+    }
+    virtual void SAL_CALL startElement(const OUString& aName,
+                              const Reference< XAttributeList > & xAttribs)
+        throw (SAXException,RuntimeException)
+    {
+        if( m_rLocator.is() ) {
+            if( m_bPrint )
+            {
+                OString o = OUStringToOString( m_rLocator->getSystemId() , RTL_TEXTENCODING_UTF8 );
+                printf( "%s(%d):" , o.getStr() , m_rLocator->getLineNumber() );
+            }
+        }
+        if( m_bPrint ) {
+            int i;
+            for( i = 0; i < m_iLevel ; i ++ ) {
+                printf( "  " );
+            }
+            OString o = OUStringToOString(aName , RTL_TEXTENCODING_UTF8 );
+            printf( "<%s> " , aName.getStr() );
+
+            for( i = 0 ; i < xAttribs->getLength() ; i ++ )
+            {
+                OString o1 = OUStringToOString(xAttribs->getNameByIndex( i ), RTL_TEXTENCODING_UTF8 );
+                OString o2 = OUStringToOString(xAttribs->getTypeByIndex( i ), RTL_TEXTENCODING_UTF8 );
+                OString o3 = OUStringToOString(xAttribs->getValueByIndex( i ) , RTL_TEXTENCODING_UTF8 );
+                printf( "(%s,%s,'%s')" , o1.getStr(), o2.getStr(), o3.getStr() );
+            }
+            printf( "\n" );
+        }
+        m_iLevel ++;
+        m_iElementCount ++;
+        m_iAttributeCount += xAttribs->getLength();
+    }
+
+    virtual void SAL_CALL endElement(const OUString& aName) throw (SAXException,RuntimeException)
+    {
+        OSL_ASSERT( m_iLevel );
+        m_iLevel --;
+        if( m_bPrint ) {
+            int i;
+            for( i = 0; i < m_iLevel ; i ++ ) {
+                printf( "  " );
+            }
+            OString o = OUStringToOString(aName , RTL_TEXTENCODING_UTF8 );
+            printf( "</%s>\n" , o.getStr() );
+        }
+    }
+
+    virtual void SAL_CALL characters(const OUString& aChars) throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint ) {
+            int i;
+            for( i = 0; i < m_iLevel ; i ++ ) {
+                printf( "  " );
+            }
+            OString o = OUStringToOString(aChars , RTL_TEXTENCODING_UTF8 );
+            printf( "%s\n" , o.getStr() );
+        }
+        m_iCharCount += aChars.getLength();
+    }
+
+    virtual void SAL_CALL ignorableWhitespace(const OUString& aWhitespaces) throw (SAXException,RuntimeException)
+    {
+        m_iWhitespaceCount += aWhitespaces.getLength();
+    }
+
+    virtual void SAL_CALL processingInstruction(const OUString& aTarget, const OUString& aData) throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint )
+        {
+            OString o1 = OUStringToOString(aTarget, RTL_TEXTENCODING_UTF8 );
+            OString o2 = OUStringToOString(aData, RTL_TEXTENCODING_UTF8 );
+            printf( "PI : %s,%s\n" , o1.getStr() , o2.getStr() );
+        }
+    }
+
+    virtual void SAL_CALL setDocumentLocator(const Reference< XLocator> & xLocator)
+        throw (SAXException,RuntimeException)
+    {
+        m_rLocator = xLocator;
+    }
+
+    virtual InputSource SAL_CALL resolveEntity(
+        const OUString& sPublicId,
+        const OUString& sSystemId)
+        throw (SAXException,RuntimeException)
+    {
+        InputSource source;
+        source.sSystemId = sSystemId;
+        source.sPublicId = sPublicId;
+
+        source.aInputStream = createStreamFromFile(
+            OUStringToOString( sSystemId , RTL_TEXTENCODING_ASCII_US) , m_xSMgr );
+
+        return source;
+    }
+
+    virtual void SAL_CALL startCDATA() throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint ) {
+            printf( "CDataStart :\n" );
+        }
+    }
+    virtual void SAL_CALL endCDATA() throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint ) {
+            printf( "CEndStart :\n" );
+        }
+    }
+    virtual void SAL_CALL comment(const OUString& sComment) throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint ) {
+            OString o1 = OUStringToOString(sComment, RTL_TEXTENCODING_UTF8 );
+            printf( "<!--%s-->\n" , o1.getStr() );
+        }
+    }
+    virtual void SAL_CALL unknown(const OUString& sString) throw (SAXException,RuntimeException)
+    {
+        if( m_bPrint )
+        {
+            OString o1 = OUStringToOString(sString, RTL_TEXTENCODING_UTF8 );
+            printf( "UNKNOWN : {%s}\n" , o1.getStr() );
+        }
+    }
+
+    virtual void SAL_CALL allowLineBreak() throw (SAXException, RuntimeException )
+    {
+
+    }
+
+    int m_iLevel;
+    int m_iElementCount;
+    int m_iAttributeCount;
+    int m_iWhitespaceCount;
+    int m_iCharCount;
+    sal_Bool m_bPrint;
+
+    Reference < XMultiServiceFactory > m_xSMgr;
+    Reference < XLocator > m_rLocator;
+};
+
+void OSaxParserTest::testSimple(    const Reference < XParser > &rParser )
+{
+    char TestString[] = "<!DOCTYPE personnel [\n"
+                        "<!ENTITY testInternal \"internal Test!\">\n"
+                        "<!ENTITY test SYSTEM \"external_entity.xml\">\n"
+                        "]>\n"
+                        "<personnel>\n"
+                        "<person> fjklsfdklsdfkl\n"
+                        "fjklsfdklsdfkl\n"
+                        "<?testpi pidata?>\n"
+                        "&testInternal;\n"
+                        "<HUHU x='5' y='kjfd'> blahuhu\n"
+                        "<HI> blahi\n"
+                        "     <![CDATA[<greeting>Hello, '+1+12world!</greeting>]]>\n"
+                        "   <!-- huhu <jdk> -->\n"
+                        "<?testpi pidata?>\n"
+                        "</HI>\n"
+                        "aus XMLTest\n"
+                        "</HUHU>\n"
+                        "</person>\n"
+                        "</personnel>\n\n\n";
+
+    Sequence< sal_Int8> seqBytes( strlen( TestString ) );
+    memcpy( seqBytes.getArray() , TestString , strlen( TestString ) );
+
+    Reference< XInputStream > rInStream;
+    OUString sInput;
+    rInStream = createStreamFromSequence( seqBytes , m_rFactory );
+    sInput = "internal";
+
+    if( rParser.is() ) {
+        InputSource source;
+
+        source.aInputStream = rInStream;
+        source.sSystemId    = sInput;
+
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( m_rFactory , sal_False );
+        Reference < XDocumentHandler > rDocHandler( (XDocumentHandler *) pDocHandler , UNO_QUERY );
+        Reference< XEntityResolver >
+            rEntityResolver( (XEntityResolver *) pDocHandler , UNO_QUERY );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+
+        try
+        {
+            rParser->parseStream( source );
+            ERROR_ASSERT( pDocHandler->m_iElementCount      == 4 , "wrong element count"    );
+            ERROR_ASSERT( pDocHandler->m_iAttributeCount    == 2 , "wrong attribute count"   );
+            ERROR_ASSERT( pDocHandler->m_iCharCount         == 130 , "wrong char count"     );
+            ERROR_ASSERT( pDocHandler->m_iWhitespaceCount   == 0, "wrong whitespace count" );
+        }
+        catch( SAXParseException & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+        }
+        catch( SAXException & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+        }
+        catch( Exception & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+        }
+        catch( ... )
+        {
+            BUILD_ERROR( 1 , "unknown exception" );
+        }
+    }
+}
+
+void OSaxParserTest::testNamespaces( const Reference < XParser > &rParser )
+{
+
+    char TestString[] =
+    "<?xml version='1.0'?>\n"
+      "<!-- all elements here are explicitly in the HTML namespace -->\n"
+      "<html:html xmlns:html='http://www.w3.org/TR/REC-html40'>\n"
+        "<html:head><html:title>Frobnostication</html:title></html:head>\n"
+        "<html:body><html:p>Moved to \n"
+          "<html:a href='http://frob.com'>here.</html:a></html:p></html:body>\n"
+      "</html:html>\n";
+
+    Sequence<sal_Int8> seqBytes( strlen( TestString ) );
+    memcpy( seqBytes.getArray() , TestString , strlen( TestString ) );
+
+    Reference< XInputStream >  rInStream;
+    OUString sInput;
+
+    rInStream = createStreamFromSequence( seqBytes , m_rFactory );
+    sInput = "internal";
+
+    if( rParser.is() ) {
+        InputSource source;
+
+        source.aInputStream = rInStream;
+        source.sSystemId    = sInput;
+
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( m_rFactory , sal_False );
+        Reference < XDocumentHandler > rDocHandler( (XDocumentHandler *) pDocHandler , UNO_QUERY );
+        Reference< XEntityResolver >    rEntityResolver(
+            (XEntityResolver *) pDocHandler , UNO_QUERY );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+
+        try
+        {
+            rParser->parseStream( source );
+            ERROR_ASSERT( pDocHandler->m_iElementCount      == 6 , "wrong element count"    );
+            ERROR_ASSERT( pDocHandler->m_iAttributeCount    == 2 , "wrong attribute count"   );
+            ERROR_ASSERT( pDocHandler->m_iCharCount         == 33, "wrong char count"       );
+            ERROR_ASSERT( pDocHandler->m_iWhitespaceCount   == 0 , "wrong whitespace count" );
+        }
+        catch( Exception & e ) {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+        }
+        catch( ... )
+        {
+            BUILD_ERROR( 1 , "unknown exception" );
+        }
+    }
+}
+
+void OSaxParserTest::testEncoding( const Reference < XParser > &rParser )
+{
+    char TestString[] =
+    "<?xml version='1.0' encoding=\"iso-8859-1\"?>\n"
+      "<!-- all elements here are explicitly in the HTML namespace -->\n"
+      "<html:html xmlns:html='http://www.w3.org/TR/REC-html40'>\n"
+        "<html:head><html:title>Frobnostication</html:title></html:head>\n"
+        "<html:body><html:p>Moved to \337\n"
+          "<html:a href='http://frob.com'>here.</html:a></html:p></html:body>\n"
+      "</html:html>\n";
+
+    Sequence<sal_Int8> seqBytes( strlen( TestString ) );
+    memcpy( seqBytes.getArray() , TestString , strlen( TestString ) );
+
+    Reference< XInputStream > rInStream;
+    OUString sInput;
+
+    rInStream = createStreamFromSequence( seqBytes , m_rFactory );
+    sInput = "internal";
+
+    if( rParser.is() ) {
+        InputSource source;
+
+        source.aInputStream = rInStream;
+        source.sSystemId    = sInput;
+
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( m_rFactory , sal_False );
+        Reference < XDocumentHandler > rDocHandler( (XDocumentHandler *) pDocHandler , UNO_QUERY );
+        Reference< XEntityResolver >  rEntityResolver( (XEntityResolver *) pDocHandler , UNO_QUERY );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+        try
+        {
+            rParser->parseStream( source );
+        }
+        catch( Exception & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+        }
+        catch ( ... )
+        {
+            BUILD_ERROR( 1 , "unknown exception" );
+        }
+    }
+}
+
+void OSaxParserTest::testFile( const Reference < XParser > & rParser )
+{
+
+    Reference< XInputStream > rInStream = createStreamFromFile( "testsax.xml" , m_rFactory );
+    OUString sInput = "testsax.xml";
+
+    if( rParser.is() && rInStream.is() ) {
+        InputSource source;
+
+        source.aInputStream = rInStream;
+        source.sSystemId    = sInput;
+
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( m_rFactory , sal_True );
+        Reference < XDocumentHandler > rDocHandler( (XDocumentHandler *) pDocHandler , UNO_QUERY );
+        Reference < XEntityResolver >   rEntityResolver( (XEntityResolver *) pDocHandler , UNO_QUERY );
+        Reference < XErrorHandler > rErrorHandler( ( XErrorHandler * )pDocHandler , UNO_QUERY );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+        rParser->setErrorHandler( rErrorHandler );
+
+        try
+        {
+            rParser->parseStream( source );
+        }
+        catch( SAXParseException & e ) {
+            Any any;
+            any <<= e;
+
+            while(true) {
+                SAXParseException *pEx;
+                if( any.getValueType() == cppu::UnoType<decltype(e)>::get() ) {
+                    pEx = ( SAXParseException * ) any.getValue();
+                    OString o1 = OUStringToOString(pEx->Message, RTL_TEXTENCODING_UTF8 );
+                    printf( "%s\n" , o1.getStr()  );
+                    any = pEx->WrappedException;
+                }
+                else {
+                    break;
+                }
+            }
+        }
+        catch( SAXException & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            BUILD_ERROR( 1 , o1.getStr() );
+
+        }
+        catch( Exception & e ) {
+            printf( "normal exception ! %s\n", e.Message );
+        }
+        catch ( ... )
+        {
+            printf( "any exception !!!!\n" );
+        }
+    }
+}
+
+void OSaxParserTest::testPerformance( const Reference < XParser > & rParser )
+{
+    Reference < XInputStream > rInStream =
+        createStreamFromFile( "testPerformance.xml" , m_rFactory );
+    OUString sInput = "testperformance.xml";
+
+    if( rParser.is() && rInStream.is() ) {
+        InputSource source;
+
+        source.aInputStream = rInStream;
+        source.sSystemId    = sInput;
+
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( m_rFactory , sal_False );
+        Reference < XDocumentHandler > rDocHandler( (XDocumentHandler *) pDocHandler , UNO_QUERY );
+        Reference < XEntityResolver > rEntityResolver( (XEntityResolver *) pDocHandler , UNO_QUERY );
+        Reference < XErrorHandler > rErrorHandler( ( XErrorHandler * )pDocHandler , UNO_QUERY );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+        rParser->setErrorHandler( rErrorHandler );
+
+        try
+        {
+            TimeValue aStartTime, aEndTime;
+            osl_getSystemTime( &aStartTime );
+            rParser->parseStream( source );
+            osl_getSystemTime( &aEndTime );
+
+            double fStart = (double)aStartTime.Seconds + ((double)aStartTime.Nanosec / 1000000000.0);
+            double fEnd = (double)aEndTime.Seconds + ((double)aEndTime.Nanosec / 1000000000.0);
+
+            printf( "Performance reading : %g s\n" , fEnd - fStart );
+
+        }
+        catch( SAXParseException &e ) {
+            Any any;
+            any <<= e;
+            while(true) {
+                if( any.getValueType() == cppu::UnoType<decltype(e)>::get() ) {
+                    SAXParseException ex;
+                    any >>= ex;
+                    OString o = OUStringToOString( ex.Message , RTL_TEXTENCODING_ASCII_US );
+                    printf( "%s\n" , o.getStr()  );
+                    any <<= ex.WrappedException;
+                }
+                else {
+                    break;
+                }
+            }
+        }
+        catch( SAXException &e  ) {
+            OString o = OUStringToOString( e.Message , RTL_TEXTENCODING_ASCII_US );
+            printf( "%s\n" , o.getStr()  );
+
+        }
+        catch( ... )
+        {
+            printf( "any exception !!!!\n" );
+        }
+    }
+}
+} // namespace
+
+using namespace sax_test;
+
+extern "C"
+{
+
+sal_Bool SAL_CALL component_writeInfo(
+    void * pServiceManager, void * pRegistryKey )
+{
+    if (pRegistryKey)
+    {
+        try
+        {
+            Reference< XRegistryKey > xKey(
+                reinterpret_cast< XRegistryKey * >( pRegistryKey ) );
+
+            OUString str =
+                OUString( "/" ) +
+                OSaxParserTest_getImplementationName() +
+                OUString( "/UNO/SERVICES" );
+            Reference< XRegistryKey > xNewKey = xKey->createKey( str );
+            xNewKey->createKey( OSaxParserTest_getServiceName() );
+
+            str =
+                OUString( "/" ) +
+                OSaxWriterTest_getImplementationName() +
+                OUString( "/UNO/SERVICES" );
+
+            xNewKey = xKey->createKey( str );
+            xNewKey->createKey( OSaxWriterTest_getServiceName() );
+
+            return sal_True;
+        }
+        catch (InvalidRegistryException &)
+        {
+            OSL_FAIL( "### InvalidRegistryException!" );
+        }
+    }
+    return sal_False;
+}
+
+SAL_DLLPUBLIC_EXPORT void * SAL_CALL component_getFactory(
+    const char * pImplName, void * pServiceManager, void * pRegistryKey )
+{
+    void * pRet = 0;
+
+    if (pServiceManager )
+    {
+        Reference< XSingleServiceFactory > xRet;
+        Reference< XMultiServiceFactory > xSMgr =
+            reinterpret_cast< XMultiServiceFactory * > ( pServiceManager );
+
+        OUString aImplementationName = OUString::createFromAscii( pImplName );
+
+
+        if (aImplementationName == OSaxWriterTest_getImplementationName() )
+        {
+            xRet = createSingleFactory( xSMgr, aImplementationName,
+                                        OSaxWriterTest_CreateInstance,
+                                        OSaxWriterTest_getSupportedServiceNames() );
+        }
+        else if (aImplementationName == OSaxParserTest_getImplementationName() )
+        {
+            xRet = createSingleFactory( xSMgr, aImplementationName,
+                                        OSaxParserTest_CreateInstance,
+                                        OSaxParserTest_getSupportedServiceNames() );
+        }
+        if (xRet.is())
+        {
+            xRet->acquire();
+            pRet = xRet.get();
+        }
+    }
+    return pRet;
+}
+
+} // extern C
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/test/sax/testwriter.cxx b/sax/test/sax/testwriter.cxx
new file mode 100644
index 0000000000..2a5d3706d4
--- /dev/null
+++ b/sax/test/sax/testwriter.cxx
@@ -0,0 +1,662 @@
+/* -*- 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 <vector>
+#include <stdio.h>
+
+#include <com/sun/star/test/XSimpleTest.hpp>
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+
+#include <com/sun/star/io/XActiveDataSource.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
+
+#include <osl/time.h>
+
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+
+
+using namespace ::std;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::test;
+using namespace ::com::sun::star::registry;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::xml::sax;
+
+namespace sax_test {
+
+class OFileWriter :
+        public WeakImplHelper< XOutputStream >
+{
+public:
+    explicit OFileWriter( char *pcFile ) { strncpy( m_pcFile, pcFile, 256 - 1 ); m_f = 0; }
+
+
+public:
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData)
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+    virtual void SAL_CALL flush()
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+    virtual void SAL_CALL closeOutput()
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+private:
+    char m_pcFile[256];
+    FILE *m_f;
+};
+
+
+void OFileWriter::writeBytes(const Sequence< sal_Int8 >& aData)
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    if( ! m_f ) {
+        m_f = fopen( m_pcFile , "w" );
+    }
+
+       fwrite( aData.getConstArray() , 1 , aData.getLength() , m_f );
+}
+
+
+void OFileWriter::flush()
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    fflush( m_f );
+}
+
+void OFileWriter::closeOutput()
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    fclose( m_f );
+    m_f = 0;
+}
+
+
+class OSaxWriterTest :
+        public WeakImplHelper< XSimpleTest >
+{
+public:
+    explicit OSaxWriterTest( const Reference < XMultiServiceFactory > & rFactory ) : m_rFactory( rFactory )
+    {
+
+    }
+    ~OSaxWriterTest() {}
+
+
+public:
+    virtual void SAL_CALL testInvariant(
+        const OUString& TestName,
+        const Reference < XInterface >& TestObject)
+        throw  (    IllegalArgumentException,
+                    RuntimeException);
+
+    virtual sal_Int32 SAL_CALL test(
+        const OUString& TestName,
+        const Reference < XInterface >& TestObject,
+        sal_Int32 hTestHandle)
+        throw  (    IllegalArgumentException,RuntimeException);
+
+    virtual sal_Bool SAL_CALL testPassed()
+        throw  (    RuntimeException);
+    virtual Sequence< OUString > SAL_CALL getErrors()               throw  (RuntimeException);
+    virtual Sequence< Any > SAL_CALL getErrorExceptions()       throw  (RuntimeException);
+    virtual Sequence< OUString > SAL_CALL getWarnings()             throw  (RuntimeException);
+
+private:
+    void testSimple( const Reference< XExtendedDocumentHandler > &r );
+    void testExceptions( const Reference< XExtendedDocumentHandler > &r );
+    void testDTD( const Reference< XExtendedDocumentHandler > &r );
+    void testPerformance( const Reference< XExtendedDocumentHandler > &r );
+    void writeParagraph( const Reference< XExtendedDocumentHandler > &r , const OUString & s);
+
+private:
+    Sequence<Any>       m_seqExceptions;
+    Sequence<OUString>      m_seqErrors;
+    Sequence<OUString>      m_seqWarnings;
+    Reference < XMultiServiceFactory > m_rFactory;
+
+};
+
+
+/*----------------------------------------
+*
+*   Attributelist implementation
+*
+*----------------------------------------*/
+struct AttributeListImpl_impl;
+class AttributeListImpl : public WeakImplHelper< XAttributeList >
+{
+public:
+    AttributeListImpl();
+    AttributeListImpl( const AttributeListImpl & );
+    ~AttributeListImpl();
+
+public:
+    virtual sal_Int16 SAL_CALL getLength() throw  (RuntimeException);
+    virtual OUString SAL_CALL getNameByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getTypeByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getTypeByName(const OUString& aName) throw  (RuntimeException);
+    virtual OUString SAL_CALL getValueByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getValueByName(const OUString& aName) throw  (RuntimeException);
+
+public:
+    void addAttribute( const OUString &sName ,
+                       const OUString &sType ,
+                       const OUString &sValue );
+    void clear();
+
+private:
+    struct AttributeListImpl_impl *m_pImpl;
+};
+
+
+struct TagAttribute
+{
+    TagAttribute(){}
+    TagAttribute( const OUString &sName,
+                  const OUString &sType ,
+                  const OUString &sValue )
+    {
+        sName     = sName;
+        sType     = sType;
+        sValue    = sValue;
+    }
+
+    OUString sName;
+    OUString sType;
+    OUString sValue;
+};
+
+struct AttributeListImpl_impl
+{
+    AttributeListImpl_impl()
+    {
+        // performance improvement during adding
+        vecAttribute.reserve(20);
+    }
+    vector<struct TagAttribute> vecAttribute;
+};
+
+
+sal_Int16 AttributeListImpl::getLength() throw  (RuntimeException)
+{
+    return m_pImpl->vecAttribute.size();
+}
+
+
+AttributeListImpl::AttributeListImpl( const AttributeListImpl &r )
+{
+    m_pImpl = new AttributeListImpl_impl;
+    *m_pImpl = *(r.m_pImpl);
+}
+
+OUString AttributeListImpl::getNameByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < m_pImpl->vecAttribute.size() ) {
+        return m_pImpl->vecAttribute[i].sName;
+    }
+    return OUString();
+}
+
+
+OUString AttributeListImpl::getTypeByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < m_pImpl->vecAttribute.size() ) {
+        return m_pImpl->vecAttribute[i].sType;
+    }
+    return OUString();
+}
+
+OUString AttributeListImpl::getValueByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < m_pImpl->vecAttribute.size() ) {
+        return m_pImpl->vecAttribute[i].sValue;
+    }
+    return OUString();
+
+}
+
+OUString AttributeListImpl::getTypeByName( const OUString& sName ) throw  (RuntimeException)
+{
+    auto ii = std::find_if(m_pImpl->vecAttribute.begin(), m_pImpl->vecAttribute.end(),
+        [&sName](const struct TagAttribute& rAttr) { return rAttr.sName == sName; });
+    if (ii != m_pImpl->vecAttribute.end())
+        return (*ii).sType;
+    return OUString();
+}
+
+OUString AttributeListImpl::getValueByName(const OUString& sName) throw  (RuntimeException)
+{
+    auto ii = std::find_if(m_pImpl->vecAttribute.begin(), m_pImpl->vecAttribute.end(),
+        [&sName](const struct TagAttribute& rAttr) { return rAttr.sName == sName; });
+    if (ii != m_pImpl->vecAttribute.end())
+        return (*ii).sValue;
+    return OUString();
+}
+
+
+AttributeListImpl::AttributeListImpl()
+{
+    m_pImpl = new AttributeListImpl_impl;
+}
+
+
+AttributeListImpl::~AttributeListImpl()
+{
+    delete m_pImpl;
+}
+
+
+void AttributeListImpl::addAttribute(   const OUString &sName ,
+                                        const OUString &sType ,
+                                        const OUString &sValue )
+{
+    m_pImpl->vecAttribute.push_back( TagAttribute( sName , sType , sValue ) );
+}
+
+void AttributeListImpl::clear()
+{
+    m_pImpl->vecAttribute.clear();
+
+}
+
+
+/**
+* for external binding
+*
+*
+**/
+Reference < XInterface > SAL_CALL OSaxWriterTest_CreateInstance( const Reference < XMultiServiceFactory > & rSMgr ) throw (Exception)
+{
+    OSaxWriterTest *p = new OSaxWriterTest( rSMgr );
+    Reference < XInterface > xService = *p;
+    return xService;
+}
+
+OUString     OSaxWriterTest_getServiceName( ) throw  ()
+{
+    return OUString( "test.com.sun.star.xml.sax.Writer");
+}
+
+OUString    OSaxWriterTest_getImplementationName( ) throw  ()
+{
+    return OUString( "test.extensions.xml.sax.Writer");
+}
+
+Sequence<OUString> OSaxWriterTest_getSupportedServiceNames( ) throw  ()
+{
+    Sequence<OUString> aRet { OSaxWriterTest_getImplementationName( ) };
+    return aRet;
+}
+
+
+void OSaxWriterTest::testInvariant( const OUString& TestName,
+                                    const Reference < XInterface >& TestObject )
+    throw  (    IllegalArgumentException, RuntimeException)
+{
+    if( OUString("com.sun.star.xml.sax.Writer") == TestName ) {
+        Reference< XDocumentHandler > doc( TestObject , UNO_QUERY );
+        Reference< XExtendedDocumentHandler > ext( TestObject , UNO_QUERY );
+        Reference< XActiveDataSource > source( TestObject , UNO_QUERY );
+
+        ERROR_ASSERT( doc.is() , "XDocumentHandler cannot be queried" );
+        ERROR_ASSERT( ext.is() , "XExtendedDocumentHandler cannot be queried" );
+        ERROR_ASSERT( source.is() , "XActiveDataSource cannot be queried" );
+    }
+    else {
+        BUILD_ERROR( 0 , "wrong test" );
+    }
+}
+
+
+sal_Int32 OSaxWriterTest::test(
+    const OUString& TestName,
+    const Reference < XInterface >& TestObject,
+    sal_Int32 hTestHandle)
+    throw  (    IllegalArgumentException,RuntimeException)
+{
+    if( OUString( "com.sun.star.xml.sax.Writer") == TestName )
+    {
+        try
+        {
+            if( 0 == hTestHandle )
+            {
+                testInvariant( TestName , TestObject );
+            }
+            else
+            {
+                Reference< XExtendedDocumentHandler > writer( TestObject , UNO_QUERY );
+
+                if( 1 == hTestHandle ) {
+                    testSimple( writer );
+                }
+                else if( 2 == hTestHandle ) {
+                    testExceptions( writer );
+                }
+                else if( 3 == hTestHandle ) {
+                    testDTD( writer );
+                }
+                else if( 4 == hTestHandle ) {
+                    testPerformance( writer );
+                }
+            }
+        }
+        catch( Exception & e )  {
+            OString o = OUStringToOString( e.Message , RTL_TEXTENCODING_ASCII_US );
+            BUILD_ERROR( 0 , o.getStr() );
+        }
+        catch( ... )
+        {
+            BUILD_ERROR( 0 , "unknown exception (Exception is  not base class)" );
+        }
+
+        hTestHandle ++;
+
+        if( hTestHandle >= 5) {
+            // all tests finished.
+            hTestHandle = -1;
+        }
+    }
+    else {
+        BUILD_ERROR( 0 , "service not supported by test." );
+    }
+    return hTestHandle;
+}
+
+
+sal_Bool OSaxWriterTest::testPassed()                   throw  (RuntimeException)
+{
+    return m_seqErrors.getLength() == 0;
+}
+
+
+Sequence< OUString > OSaxWriterTest::getErrors() throw  (RuntimeException)
+{
+    return m_seqErrors;
+}
+
+
+Sequence< Any > OSaxWriterTest::getErrorExceptions()                    throw  (RuntimeException)
+{
+    return m_seqExceptions;
+}
+
+
+Sequence< OUString > OSaxWriterTest::getWarnings()                      throw  (RuntimeException)
+{
+    return m_seqWarnings;
+}
+
+void OSaxWriterTest::writeParagraph(
+    const Reference< XExtendedDocumentHandler > &r ,
+    const OUString & s)
+{
+    int nMax = s.getLength();
+    int nStart = 0;
+
+    Sequence<sal_uInt16> seq( s.getLength() );
+    memcpy( seq.getArray() , s.getStr() , s.getLength() * sizeof( sal_uInt16 ) );
+
+    for( int n = 1 ; n < nMax ; n++ ){
+        if( 32 == seq.getArray()[n] ) {
+            r->allowLineBreak();
+            r->characters( s.copy( nStart , n - nStart ) );
+            nStart = n;
+        }
+    }
+    r->allowLineBreak();
+    r->characters( s.copy( nStart , n - nStart ) );
+}
+
+
+void OSaxWriterTest::testSimple( const Reference< XExtendedDocumentHandler > &r )
+{
+    OUString testParagraph = OUString(
+        "This is a stupid test to check whether the SAXWriter possibly makes "
+        "line breaks halfway correctly or whether it writes the line to the "
+        "bitter end." );
+
+    OFileWriter *pw = new OFileWriter("output.xml");
+    AttributeListImpl *pList = new AttributeListImpl;
+
+    Reference< XAttributeList > rList( (XAttributeList *) pList , UNO_QUERY );
+    Reference< XOutputStream > ref( ( XOutputStream * ) pw , UNO_QUERY );
+
+    Reference< XActiveDataSource > source( r , UNO_QUERY );
+
+    ERROR_ASSERT( ref.is() , "no output stream" );
+    ERROR_ASSERT( source.is() , "no active data source" );
+
+    source->setOutputStream( ref );
+
+    r->startDocument();
+
+    pList->addAttribute( OUString( "Arg1" ),
+                         OUString( "CDATA") ,
+                         OUString( "bla\n   u") );
+    pList->addAttribute( OUString( "Arg2") ,
+                         OUString( "CDATA") ,
+                         OUString( "blub") );
+
+    r->startElement( OUString( "tag1")  , rList );
+    r->ignorableWhitespace( OUString() );
+
+    r->characters( OUString( "huhu") );
+    r->ignorableWhitespace( OUString() );
+
+    r->startElement( OUString( "hi") , rList );
+    r->ignorableWhitespace( OUString() );
+
+    // the ampersand must be converted & -> &amp;
+    r->characters( OUString( "&#252;") );
+
+    // Test added for mib. Tests if errors during conversions occurs
+    r->ignorableWhitespace( OUString() );
+    char array[256];
+    for( sal_Int32 n = 32 ; n < 254 ; n ++ ) {
+        array[n-32] = n;
+    }
+    array[254-32] = 0;
+    r->characters(
+        OStringToOUString( array , RTL_TEXTENCODING_SYMBOL )
+        );
+    r->ignorableWhitespace( OUString() );
+
+    // '>' must not be converted
+    r->startCDATA();
+    r->characters( OUString( ">fsfsdf<")  );
+    r->endCDATA();
+    r->ignorableWhitespace( OUString() );
+
+    writeParagraph( r , testParagraph );
+
+
+    r->ignorableWhitespace( OUString() );
+    r->comment( OUString( "This is a comment !") );
+    r->ignorableWhitespace( OUString() );
+
+    r->startElement( OUString( "emptytagtest")  , rList );
+    r->endElement( OUString( "emptytagtest") );
+
+    r->endElement( OUString( "hi") );
+    r->ignorableWhitespace( OUString() );
+
+    r->endElement( OUString( "tag1") );
+    r->endDocument();
+
+}
+
+void OSaxWriterTest::testExceptions( const Reference< XExtendedDocumentHandler > & r )
+{
+
+    OFileWriter *pw = new OFileWriter("output2.xml");
+    AttributeListImpl *pList = new AttributeListImpl;
+
+    Reference< XAttributeList > rList( (XAttributeList *) pList , UNO_QUERY );
+    Reference< XOutputStream > ref( ( XOutputStream * ) pw , UNO_QUERY );
+
+    Reference< XActiveDataSource > source( r , UNO_QUERY );
+
+    ERROR_ASSERT( ref.is() , "no output stream" );
+    ERROR_ASSERT( source.is() , "no active data source" );
+
+    source->setOutputStream( ref );
+
+    { // startDocument must be called before start element
+        sal_Bool bException = sal_True;
+        try
+        {
+            r->startElement( OUString( "huhu") , rList );
+            bException = sal_False;
+        }
+        catch( SAXException &e )
+        {
+
+        }
+        ERROR_ASSERT( bException , "expected exception not thrown !" );
+    }
+
+    r->startDocument();
+
+    r->startElement( OUString( "huhu") , rList );
+    r->startCDATA();
+
+    {
+        sal_Bool bException = sal_True;
+        try{
+            r->startElement( OUString( "huhu") , rList );
+            bException = sal_False;
+        }
+        catch( SAXException &e ) {
+
+        }
+        ERROR_ASSERT( bException , "expected exception not thrown !" );
+    }
+
+    r->endCDATA();
+
+    {
+        sal_Unicode array[] = { 'a' , 'b' , 4 , 9 , 10 };
+        OUString o( array , 5 );
+        try
+        {
+            r->characters( o );
+            ERROR_ASSERT( 0 , "Writer allowed to write forbidden characters" );
+        }
+        catch( SAXException & e )
+        {
+
+        }
+    }
+    r->endElement( OUString( "huhu") );
+
+    r->endDocument();
+}
+
+
+void OSaxWriterTest::testDTD(const  Reference< XExtendedDocumentHandler > &r )
+{
+    OFileWriter *pw = new OFileWriter("outputDTD.xml");
+    AttributeListImpl *pList = new AttributeListImpl;
+
+    Reference< XAttributeList > rList( (XAttributeList *) pList , UNO_QUERY );
+    Reference< XOutputStream > ref( ( XOutputStream * ) pw , UNO_QUERY );
+
+    Reference< XActiveDataSource > source( r , UNO_QUERY );
+
+    ERROR_ASSERT( ref.is() , "no output stream" );
+    ERROR_ASSERT( source.is() , "no active data source" );
+
+    source->setOutputStream( ref );
+
+
+    r->startDocument();
+    r->unknown( OUString( "<!DOCTYPE iCalendar >\n") );
+    r->startElement( OUString( "huhu") , rList );
+
+    r->endElement( OUString( "huhu") );
+    r->endDocument();
+}
+
+void OSaxWriterTest::testPerformance(const  Reference< XExtendedDocumentHandler > &r )
+{
+    OFileWriter *pw = new OFileWriter("testPerformance.xml");
+    AttributeListImpl *pList = new AttributeListImpl;
+
+    OUString testParagraph =
+        OUString(
+            "This is a stupid test to check whether the SAXWriter possibly makes "
+            "line breaks halfway correctly or whether it writes the line to the "
+            "bitter end." );
+
+
+    Reference< XAttributeList > rList( (XAttributeList *) pList , UNO_QUERY );
+    Reference< XOutputStream > ref( ( XOutputStream * ) pw , UNO_QUERY );
+
+    Reference< XActiveDataSource > source( r , UNO_QUERY );
+
+    ERROR_ASSERT( ref.is() , "no output stream" );
+    ERROR_ASSERT( source.is() , "no active data source" );
+
+    source->setOutputStream( ref );
+
+    TimeValue aStartTime, aEndTime;
+    osl_getSystemTime( &aStartTime );
+
+
+    r->startDocument();
+    // just write a bunch of xml tags !
+    // for performance testing
+    sal_Int32 i2;
+    OUString huhu( "huhu" );
+    const int ITERATIONS = 125;
+    for( i2 = 0 ; i2 < ITERATIONS ; i2 ++ )
+    {
+        r->startElement( OUString( "tag" ) +
+                         OUString::valueOf( i2 ), rList );
+        for( sal_Int32 i = 0 ; i < 450 ; i ++ )
+        {
+            r->ignorableWhitespace( "" );
+            r->startElement( huhu , rList );
+            r->characters( testParagraph );
+
+            r->ignorableWhitespace( "" );
+            r->endElement( huhu );
+        }
+    }
+    for( i2 = ITERATIONS-1 ; i2 >= 0  ; i2-- )
+    {
+        r->ignorableWhitespace( "" );
+        r->endElement( OUString( "tag" ) + OUString::valueOf( i2 ) );
+    }
+
+    r->endDocument();
+
+    osl_getSystemTime( &aEndTime );
+
+    double fStart = (double)aStartTime.Seconds + ((double)aStartTime.Nanosec / 1000000000.0);
+    double fEnd = (double)aEndTime.Seconds + ((double)aEndTime.Nanosec / 1000000000.0);
+
+    printf( "Performance writing : %g s\n" , fEnd - fStart );
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/test/saxdemo.cxx b/sax/test/saxdemo.cxx
new file mode 100644
index 0000000000..7139d60ef6
--- /dev/null
+++ b/sax/test/saxdemo.cxx
@@ -0,0 +1,626 @@
+/* -*- 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 .
+ */
+
+
+// testcomponent - Loads a service and its testcomponent from dlls performs a test.
+// Expands the dll-names depending on the actual environment.
+// Example : testcomponent com.sun.star.io.Pipe stm
+
+// Therefore the testcode must exist in teststm and the testservice must be named test.com.sun.star.uno.io.Pipe
+
+
+#include <stdio.h>
+#include <vector>
+#include <cstring>
+
+#include <com/sun/star/registry/XImplementationRegistration.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+
+#include <com/sun/star/xml/sax/SAXParseException.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
+
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XActiveDataSource.hpp>
+
+#include <cppuhelper/servicefactory.hxx>
+#include <cppuhelper/implbase.hxx>
+
+
+using namespace ::std;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::registry;
+using namespace ::com::sun::star::xml::sax;
+using namespace ::com::sun::star::io;
+
+
+/************
+ * Sequence of bytes -> InputStream
+ ************/
+class OInputStream : public WeakImplHelper < XInputStream >
+{
+public:
+    explicit OInputStream( const Sequence< sal_Int8 >&seq ) :
+        m_seq( seq ),
+        nPos( 0 )
+        {}
+
+public:
+    virtual sal_Int32 SAL_CALL readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
+        throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
+        {
+            nBytesToRead = (nBytesToRead > m_seq.getLength() - nPos ) ?
+                m_seq.getLength() - nPos :
+                nBytesToRead;
+            aData = Sequence< sal_Int8 > ( &(m_seq.getConstArray()[nPos]) , nBytesToRead );
+            nPos += nBytesToRead;
+            return nBytesToRead;
+        }
+    virtual sal_Int32 SAL_CALL readSomeBytes(
+        css::uno::Sequence< sal_Int8 >& aData,
+        sal_Int32 nMaxBytesToRead )
+        throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
+        {
+            return readBytes( aData, nMaxBytesToRead );
+        }
+    virtual void SAL_CALL skipBytes( sal_Int32 /* nBytesToSkip */ )
+        throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
+        {
+            // not implemented
+        }
+    virtual sal_Int32 SAL_CALL available(  )
+        throw(NotConnectedException, IOException, RuntimeException)
+        {
+            return m_seq.getLength() - nPos;
+        }
+    virtual void SAL_CALL closeInput(  )
+        throw(NotConnectedException, IOException, RuntimeException)
+        {
+            // not needed
+        }
+    Sequence< sal_Int8> m_seq;
+    sal_Int32 nPos;
+};
+
+
+// Helper : create an input stream from a file
+
+Reference< XInputStream > createStreamFromFile(
+    const char *pcFile )
+{
+    FILE *f = fopen( pcFile , "rb" );
+    Reference<  XInputStream >  r;
+
+    if( f ) {
+        fseek( f , 0 , SEEK_END );
+        int nLength = ftell( f );
+        fseek( f , 0 , SEEK_SET );
+
+        Sequence<sal_Int8> seqIn(nLength);
+        fread( seqIn.getArray() , nLength , 1 , f );
+
+        r.set( new OInputStream( seqIn ) );
+        fclose( f );
+    }
+    return r;
+}
+
+
+// The document handler, which is needed for the saxparser
+// The Documenthandler for reading sax
+
+class TestDocumentHandler :
+    public WeakImplHelper< XExtendedDocumentHandler , XEntityResolver , XErrorHandler >
+{
+public:
+    TestDocumentHandler(  )
+    {
+    }
+
+public: // Error handler
+    virtual void SAL_CALL error(const Any& aSAXParseException) throw (SAXException, RuntimeException)
+    {
+        printf( "Error !\n" );
+        throw  SAXException(
+            OUString( "error from error handler") ,
+            Reference < XInterface >() ,
+            aSAXParseException );
+    }
+    virtual void SAL_CALL fatalError(const Any& /* aSAXParseException */) throw (SAXException, RuntimeException)
+    {
+        printf( "Fatal Error !\n" );
+    }
+    virtual void SAL_CALL warning(const Any& /* aSAXParseException */) throw (SAXException, RuntimeException)
+    {
+        printf( "Warning !\n" );
+    }
+
+
+public: // ExtendedDocumentHandler
+
+    virtual void SAL_CALL startDocument() throw (SAXException, RuntimeException)
+    {
+        m_iElementCount = 0;
+        m_iAttributeCount = 0;
+        m_iWhitespaceCount =0;
+        m_iCharCount=0;
+           printf( "document started\n" );
+    }
+    virtual void SAL_CALL endDocument() throw (SAXException, RuntimeException)
+    {
+        printf( "document finished\n" );
+        printf( "(ElementCount %d),(AttributeCount %d),(WhitespaceCount %d),(CharCount %d)\n",
+                m_iElementCount, m_iAttributeCount, m_iWhitespaceCount , m_iCharCount );
+
+    }
+    virtual void SAL_CALL startElement(const OUString& /* aName */,
+                              const Reference< XAttributeList > & xAttribs)
+        throw (SAXException,RuntimeException)
+    {
+        m_iElementCount ++;
+        m_iAttributeCount += xAttribs->getLength();
+    }
+
+    virtual void SAL_CALL endElement(const OUString& /* aName */) throw (SAXException,RuntimeException)
+    {
+        // ignored
+    }
+
+    virtual void SAL_CALL characters(const OUString& aChars) throw (SAXException,RuntimeException)
+    {
+        m_iCharCount += aChars.getLength();
+    }
+    virtual void SAL_CALL ignorableWhitespace(const OUString& aWhitespaces) throw (SAXException,RuntimeException)
+    {
+        m_iWhitespaceCount += aWhitespaces.getLength();
+    }
+
+    virtual void SAL_CALL processingInstruction(const OUString& /* aTarget */, const OUString& /* aData */) throw (SAXException,RuntimeException)
+    {
+        // ignored
+    }
+
+    virtual void SAL_CALL setDocumentLocator(const Reference< XLocator> & /* xLocator */)
+        throw (SAXException,RuntimeException)
+    {
+        // ignored
+    }
+
+    virtual InputSource SAL_CALL resolveEntity(
+        const OUString& sPublicId,
+        const OUString& sSystemId)
+        throw (RuntimeException)
+    {
+        InputSource source;
+        source.sSystemId = sSystemId;
+        source.sPublicId = sPublicId;
+
+        source.aInputStream = createStreamFromFile(
+            OUStringToOString( sSystemId, RTL_TEXTENCODING_ASCII_US).getStr() );
+
+        return source;
+    }
+
+    virtual void SAL_CALL startCDATA() throw (SAXException,RuntimeException)
+    {
+    }
+    virtual void SAL_CALL endCDATA() throw (SAXException,RuntimeException)
+    {
+    }
+    virtual void SAL_CALL comment(const OUString& /* sComment */) throw (SAXException,RuntimeException)
+    {
+    }
+    virtual void SAL_CALL unknown(const OUString& /* sString */) throw (SAXException,RuntimeException)
+    {
+    }
+
+    virtual void SAL_CALL allowLineBreak() throw (SAXException, RuntimeException )
+    {
+
+    }
+
+public:
+    int m_iElementCount;
+    int m_iAttributeCount;
+    int m_iWhitespaceCount;
+    int m_iCharCount;
+};
+
+
+// helper implementation for writing
+// implements an XAttributeList
+
+struct AttributeListImpl_impl;
+class AttributeListImpl : public WeakImplHelper< XAttributeList >
+{
+public:
+    AttributeListImpl();
+    AttributeListImpl( const AttributeListImpl & );
+    ~AttributeListImpl();
+
+public:
+    virtual sal_Int16 SAL_CALL getLength() throw  (RuntimeException);
+    virtual OUString SAL_CALL getNameByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getTypeByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getTypeByName(const OUString& aName) throw  (RuntimeException);
+    virtual OUString SAL_CALL getValueByIndex(sal_Int16 i) throw  (RuntimeException);
+    virtual OUString SAL_CALL getValueByName(const OUString& aName) throw  (RuntimeException);
+
+public:
+    void addAttribute( const OUString &sName ,
+                       const OUString &sType ,
+                       const OUString &sValue );
+    void clear();
+
+private:
+    struct AttributeListImpl_impl *m_pImpl;
+};
+
+
+struct TagAttribute
+{
+    TagAttribute(){}
+    TagAttribute( const OUString &s_Name,
+                  const OUString &s_Type ,
+                  const OUString &s_Value )
+      : sName(s_Name),
+        sType(s_Type),
+        sValue(s_Value)
+    {
+    }
+
+    OUString sName;
+    OUString sType;
+    OUString sValue;
+};
+
+struct AttributeListImpl_impl
+{
+    AttributeListImpl_impl()
+    {
+        // performance improvement during adding
+        vecAttribute.reserve(20);
+    }
+    vector<struct TagAttribute> vecAttribute;
+};
+
+
+sal_Int16 AttributeListImpl::getLength() throw  (RuntimeException)
+{
+    return (sal_Int16) m_pImpl->vecAttribute.size();
+}
+
+
+AttributeListImpl::AttributeListImpl( const AttributeListImpl &r )
+{
+    m_pImpl = new AttributeListImpl_impl;
+    *m_pImpl = *(r.m_pImpl);
+}
+
+OUString AttributeListImpl::getNameByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < sal::static_int_cast<sal_Int16>(m_pImpl->vecAttribute.size()) ) {
+        return m_pImpl->vecAttribute[i].sName;
+    }
+    return OUString();
+}
+
+
+OUString AttributeListImpl::getTypeByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < sal::static_int_cast<sal_Int16>(m_pImpl->vecAttribute.size()) ) {
+        return m_pImpl->vecAttribute[i].sType;
+    }
+    return OUString();
+}
+
+OUString AttributeListImpl::getValueByIndex(sal_Int16 i) throw  (RuntimeException)
+{
+    if( i < sal::static_int_cast<sal_Int16>(m_pImpl->vecAttribute.size()) ) {
+        return m_pImpl->vecAttribute[i].sValue;
+    }
+    return OUString();
+
+}
+
+OUString AttributeListImpl::getTypeByName( const OUString& sName ) throw  (RuntimeException)
+{
+    auto ii = std::find_if(m_pImpl->vecAttribute.begin(), m_pImpl->vecAttribute.end(),
+        [&sName](const struct TagAttribute& rAttr) { return rAttr.sName == sName; });
+    if (ii != m_pImpl->vecAttribute.end())
+        return (*ii).sType;
+    return OUString();
+}
+
+OUString AttributeListImpl::getValueByName(const OUString& sName) throw  (RuntimeException)
+{
+    auto ii = std::find_if(m_pImpl->vecAttribute.begin(), m_pImpl->vecAttribute.end(),
+        [&sName](const struct TagAttribute& rAttr) { return rAttr.sName == sName; });
+    if (ii != m_pImpl->vecAttribute.end())
+        return (*ii).sValue;
+    return OUString();
+}
+
+
+AttributeListImpl::AttributeListImpl()
+{
+    m_pImpl = new AttributeListImpl_impl;
+}
+
+
+AttributeListImpl::~AttributeListImpl()
+{
+    delete m_pImpl;
+}
+
+
+void AttributeListImpl::addAttribute(   const OUString &sName ,
+                                        const OUString &sType ,
+                                        const OUString &sValue )
+{
+    m_pImpl->vecAttribute.push_back( TagAttribute( sName , sType , sValue ) );
+}
+
+void AttributeListImpl::clear()
+{
+    m_pImpl->vecAttribute.clear();
+}
+
+
+// helper function for writing
+// ensures that linebreaks are inserted
+// when writing a long text.
+// Note: this implementation may be a bit slow,
+// but it shows, how the SAX-Writer handles the allowLineBreak calls.
+
+void writeParagraphHelper(
+    const  Reference< XExtendedDocumentHandler > &r ,
+    const OUString & s)
+{
+    int nMax = s.getLength();
+    int nStart = 0;
+    int n = 1;
+
+    Sequence<sal_uInt16> seq( s.getLength() );
+    memcpy( seq.getArray() , s.getStr() , s.getLength() * sizeof( sal_uInt16 ) );
+
+    for( n = 1 ; n < nMax ; n++ ){
+        if( 32 == seq.getArray()[n] ) {
+            r->allowLineBreak();
+            r->characters( s.copy( nStart , n - nStart ) );
+            nStart = n;
+        }
+    }
+    r->allowLineBreak();
+    r->characters( s.copy( nStart , n - nStart ) );
+}
+
+
+// helper implementation for SAX-Writer
+// writes data to a file
+
+class OFileWriter :
+        public WeakImplHelper< XOutputStream >
+{
+public:
+    explicit OFileWriter( char *pcFile ) { strncpy( m_pcFile , pcFile, 256 - 1 ); m_f = 0; }
+
+
+public:
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData)
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+    virtual void SAL_CALL flush()
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+    virtual void SAL_CALL closeOutput()
+        throw  (NotConnectedException, BufferSizeExceededException, RuntimeException);
+private:
+    char m_pcFile[256];
+    FILE *m_f;
+};
+
+
+void OFileWriter::writeBytes(const Sequence< sal_Int8 >& aData)
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    if( ! m_f ) {
+        m_f = fopen( m_pcFile , "w" );
+    }
+
+    fwrite( aData.getConstArray() , 1 , aData.getLength() , m_f );
+}
+
+
+void OFileWriter::flush()
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    fflush( m_f );
+}
+
+void OFileWriter::closeOutput()
+    throw  (NotConnectedException, BufferSizeExceededException, RuntimeException)
+{
+    fclose( m_f );
+    m_f = 0;
+}
+
+
+// Needed to switch on solaris threads
+#ifdef __sun
+extern "C" void ChangeGlobalInit();
+#endif
+int main (int argc, char **argv)
+{
+
+    if( argc < 3) {
+        printf( "usage : saxdemo inputfile outputfile\n" );
+        exit( 0 );
+    }
+#ifdef __sun
+    // switch on threads in solaris
+    ChangeGlobalInit();
+#endif
+
+    // create service manager
+    Reference< XMultiServiceFactory > xSMgr = createRegistryServiceFactory(
+        OUString(  "applicat.rdb" ) );
+
+    Reference < XImplementationRegistration > xReg;
+    try
+    {
+        // Create registration service
+        Reference < XInterface > x = xSMgr->createInstance( "com.sun.star.registry.ImplementationRegistration" );
+        xReg.set( x , UNO_QUERY );
+    }
+    catch( Exception & ) {
+        printf( "Couldn't create ImplementationRegistration service\n" );
+        exit(1);
+    }
+
+    OString sTestName;
+    try
+    {
+        // Load dll for the tested component
+        OUString aDllName( "sax.uno" SAL_DLLEXTENSION );
+        xReg->registerImplementation(
+            OUString("com.sun.star.loader.SharedLibrary"),
+            aDllName,
+            Reference< XSimpleRegistry > ()  );
+    }
+    catch( Exception &e ) {
+        printf( "Couldn't reach sax dll\n" );
+        printf( "%s\n" , OUStringToOString( e.Message , RTL_TEXTENCODING_ASCII_US ).getStr() );
+
+        exit(1);
+    }
+
+
+    // parser demo
+    // read xml from a file and count elements
+
+    Reference< XInterface > x = xSMgr->createInstance( "com.sun.star.xml.sax.Parser" );
+    if( x.is() )
+    {
+        Reference< XParser > rParser( x , UNO_QUERY );
+
+        // create and connect the document handler to the parser
+        TestDocumentHandler *pDocHandler = new TestDocumentHandler( );
+
+        Reference < XDocumentHandler >  rDocHandler( (XDocumentHandler *) pDocHandler );
+        Reference< XEntityResolver > rEntityResolver( (XEntityResolver *) pDocHandler );
+
+        rParser->setDocumentHandler( rDocHandler );
+        rParser->setEntityResolver( rEntityResolver );
+
+        // create the input stream
+        InputSource source;
+        source.aInputStream = createStreamFromFile( argv[1] );
+        source.sSystemId    = OUString::createFromAscii( argv[1] );
+
+        try
+        {
+            // start parsing
+            rParser->parseStream( source );
+        }
+
+        catch( Exception & e )
+        {
+            OString o1 = OUStringToOString(e.Message, RTL_TEXTENCODING_UTF8 );
+            printf( "Exception during parsing : %s\n" ,  o1.getStr() );
+        }
+    }
+    else
+    {
+        printf( "couldn't create sax-parser component\n" );
+    }
+
+
+    // The SAX-Writer demo
+
+    x= xSMgr->createInstance("com.sun.star.xml.sax.Writer");
+    if( x.is() )
+    {
+        printf( "start writing to %s\n" , argv[2] );
+
+        OFileWriter *pw = new OFileWriter( argv[2] );
+        Reference< XActiveDataSource > source( x , UNO_QUERY );
+        source->setOutputStream( Reference< XOutputStream> ( (XOutputStream*) pw ) );
+
+        AttributeListImpl *pList = new AttributeListImpl;
+        Reference< XAttributeList > rList( (XAttributeList *) pList );
+
+        Reference< XExtendedDocumentHandler > r( x , UNO_QUERY );
+        r->startDocument();
+
+        pList->addAttribute( OUString( "Arg1" ),
+                             OUString( "CDATA") ,
+                             OUString( "foo\n   u") );
+        pList->addAttribute( OUString( "Arg2") ,
+                             OUString( "CDATA") ,
+                             OUString( "foo2") );
+
+        r->startElement( OUString( "tag1")  , rList );
+        // tells the writer to insert a linefeed
+        r->ignorableWhitespace( OUString() );
+
+        r->characters( OUString( "huhu") );
+        r->ignorableWhitespace( OUString() );
+
+        r->startElement( OUString( "hi") , rList );
+        r->ignorableWhitespace( OUString() );
+
+        // the enpassant must be converted & -> &amp;
+        r->characters( OUString( "&#252;") );
+        r->ignorableWhitespace( OUString() );
+
+        // '>' must not be converted
+        r->startCDATA();
+        r->characters( OUString( " > foo < ")  );
+        r->endCDATA();
+        r->ignorableWhitespace( OUString() );
+
+        OUString testParagraph = OUString(
+            "This is only a test to check, if the writer inserts line feeds "
+            "if needed or if the writer puts the whole text into one line." );
+        writeParagraphHelper( r , testParagraph );
+
+        r->ignorableWhitespace( OUString() );
+        r->comment( OUString( "This is a comment !") );
+        r->ignorableWhitespace( OUString() );
+
+        r->startElement( OUString( "emptytagtest")  , rList );
+        r->endElement( OUString( "emptytagtest") );
+        r->ignorableWhitespace( OUString() );
+
+        r->endElement( OUString( "hi") );
+        r->ignorableWhitespace( OUString() );
+
+        r->endElement( OUString( "tag1") );
+        r->endDocument();
+
+        printf( "finished writing\n" );
+    }
+    else
+    {
+        printf( "couldn't create sax-writer component\n" );
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sax/test/testcomponent.cxx b/sax/test/testcomponent.cxx
new file mode 100644
index 0000000000..51f8f244e0
--- /dev/null
+++ b/sax/test/testcomponent.cxx
@@ -0,0 +1,223 @@
+/* -*- 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 .
+ */
+
+
+// testcomponent - Loads a service and its testcomponent from dlls performs a test.
+// Expands the dll-names depending on the actual environment.
+// Example : testcomponent com.sun.star.io.Pipe stm
+
+// Therefore the testcode must exist in teststm and the testservice must be named com.sun.star.io.Pipe
+
+
+#include <stdio.h>
+#include <com/sun/star/registry/XImplementationRegistration.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+
+#include <com/sun/star/test/XSimpleTest.hpp>
+
+#include <cppuhelper/servicefactory.hxx>
+
+
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::test;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::registry;
+
+// Needed to switch on solaris threads
+#ifdef __sun
+extern "C" void ChangeGlobalInit();
+#endif
+
+int main (int argc, char **argv)
+{
+
+    if( argc < 3) {
+        printf( "usage : testcomponent service dll [additional dlls]\n" );
+        exit( 0 );
+    }
+#ifdef __sun
+    // switch on threads in solaris
+    ChangeGlobalInit();
+#endif
+
+    // create service manager
+    Reference< XMultiServiceFactory > xSMgr =
+        createRegistryServiceFactory( OUString( "applicat.rdb") );
+
+    Reference < XImplementationRegistration > xReg;
+    Reference < XSimpleRegistry > xSimpleReg;
+
+    try
+    {
+        // Create registration service
+        Reference < XInterface > x = xSMgr->createInstance( "com.sun.star.registry.ImplementationRegistration" );
+        xReg.set( x , UNO_QUERY );
+    }
+    catch (const Exception&)
+    {
+        printf( "Couldn't create ImplementationRegistration service\n" );
+        exit(1);
+    }
+
+    char szBuf[1024];
+    OString sTestName;
+
+    try
+    {
+        // Load dll for the tested component
+        for( int n = 2 ; n <argc ; n ++ ) {
+#ifdef _WIN32
+            OUString aDllName = OStringToOUString( argv[n] , RTL_TEXTENCODING_ASCII_US );
+#else
+            OUString aDllName = "lib";
+            aDllName += OStringToOUString( argv[n] , RTL_TEXTENCODING_ASCII_US );
+            aDllName += ".so";
+#endif
+            xReg->registerImplementation(
+                OUString("com.sun.star.loader.SharedLibrary"),
+                aDllName,
+                xSimpleReg );
+        }
+    }
+    catch (const Exception &e)
+    {
+        printf( "Couldn't reach dll %s\n" , szBuf );
+        printf( "%s\n" , OUStringToOString( e.Message , RTL_TEXTENCODING_ASCII_US ).getStr() );
+
+        exit(1);
+    }
+
+
+    try
+    {
+        // Load dll for the test component
+        sTestName = "test";
+        sTestName += argv[2];
+
+#ifdef _WIN32
+        OUString aDllName = OStringToOUString( sTestName , RTL_TEXTENCODING_ASCII_US );
+#else
+        OUString aDllName = "lib";
+        aDllName += OStringToOUString( sTestName , RTL_TEXTENCODING_ASCII_US );
+        aDllName += ".so";
+#endif
+
+        xReg->registerImplementation(
+            OUString("com.sun.star.loader.SharedLibrary") ,
+            aDllName,
+            xSimpleReg );
+    }
+    catch (const Exception&)
+    {
+        printf( "Couldn't reach dll %s\n" , szBuf );
+        exit(1);
+    }
+
+
+    // Instantiate test service
+    sTestName = "test.";
+    sTestName += argv[1];
+
+    Reference < XInterface > xIntTest =
+        xSMgr->createInstance( OStringToOUString( sTestName , RTL_TEXTENCODING_ASCII_US ) );
+    Reference< XSimpleTest > xTest( xIntTest , UNO_QUERY );
+
+    if( ! xTest.is() ) {
+        printf( "Couldn't instantiate test service \n" );
+        exit( 1 );
+    }
+
+
+    sal_Int32 nHandle = 0;
+    sal_Int32 nNewHandle;
+    sal_Int32 nErrorCount = 0;
+    sal_Int32 nWarningCount = 0;
+
+    // loop until all test are performed
+    while( nHandle != -1 )
+    {
+        // Instantiate service
+        Reference< XInterface > x =
+            xSMgr->createInstance( OStringToOUString( argv[1] , RTL_TEXTENCODING_ASCII_US ) );
+        if( ! x.is() )
+        {
+            printf( "Couldn't instantiate service !\n" );
+            exit( 1 );
+        }
+
+        // do the test
+        try
+        {
+            nNewHandle = xTest->test(
+                OStringToOUString( argv[1] , RTL_TEXTENCODING_ASCII_US ) , x , nHandle );
+        }
+        catch (const Exception &e)
+        {
+            OString o  = OUStringToOString( e.Message, RTL_TEXTENCODING_ASCII_US );
+            printf( "testcomponent : uncaught exception %s\n" , o.getStr() );
+            exit(1);
+        }
+        catch (...)
+        {
+            printf( "testcomponent : uncaught unknown exception\n"  );
+            exit(1);
+        }
+
+
+        // print errors and warning
+        Sequence<OUString> seqErrors = xTest->getErrors();
+        Sequence<OUString> seqWarnings = xTest->getWarnings();
+        if( seqWarnings.getLength() > nWarningCount )
+        {
+            printf( "Warnings during test %" SAL_PRIxUINT32 "!\n" , nHandle );
+            for( ; nWarningCount < seqWarnings.getLength() ; nWarningCount ++ )
+            {
+                OString o = OUStringToOString(
+                    seqWarnings.getArray()[nWarningCount], RTL_TEXTENCODING_ASCII_US );
+                printf( "Warning\n%s\n---------\n" , o.getStr() );
+            }
+        }
+
+
+        if( seqErrors.getLength() > nErrorCount ) {
+            printf( "Errors during test %" SAL_PRIxUINT32 "!\n" , nHandle );
+            for( ; nErrorCount < seqErrors.getLength() ; nErrorCount ++ ) {
+                OString o = OUStringToOString(
+                    seqErrors.getArray()[nErrorCount], RTL_TEXTENCODING_ASCII_US );
+                printf( "%s\n" , o.getStr() );
+            }
+        }
+
+        nHandle = nNewHandle;
+    }
+
+    if( xTest->testPassed() ) {
+        printf( "Test passed !\n" );
+    }
+    else {
+        printf( "Test failed !\n" );
+    }
+
+    Reference <XComponent >  rComp( xSMgr , UNO_QUERY );
+    rComp->dispose();
+    return 0;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-15 05:54:39 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-15 05:54:39 +0000
commit	267c6f2ac71f92999e969232431ba04678e7437e (patch)
tree	358c9467650e1d0a1d7227a21dac2e3d08b622b2 /sax
parent	Initial commit. (diff)
download	libreoffice-267c6f2ac71f92999e969232431ba04678e7437e.tar.xz libreoffice-267c6f2ac71f92999e969232431ba04678e7437e.zip