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diff --git a/xmlsecurity/source/xmlsec/xmlstreamio.cxx b/xmlsecurity/source/xmlsec/xmlstreamio.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+/*
+ * Implementation of the I/O interfaces based on stream and URI binding
+ */
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/uri.hxx>
+#include <comphelper/scopeguard.hxx>
+
+#include <com/sun/star/xml/crypto/XUriBinding.hpp>
+
+static bool g_bInputCallbacksEnabled = false;
+static bool g_bInputCallbacksRegistered = false;
+
+static css::uno::Reference< css::xml::crypto::XUriBinding > m_xUriBinding ;
+
+extern "C" {
+
+static int xmlStreamMatch( const char* uri )
+{
+ css::uno::Reference< css::io::XInputStream > xInputStream ;
+
+ if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+ {
+ if( uri == nullptr || !m_xUriBinding.is() )
+ return 0 ;
+ //XMLSec first unescapes the uri and calls this function. For example, we pass the Uri
+ //ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
+ //first. If this failed it would try this
+ //again with the original escaped string. However, it does not get this far, because there
+ //is another callback registered by libxml which claims to be able to handle this uri.
+ OUString sUri =
+ ::rtl::Uri::encode( OUString::createFromAscii( uri ),
+ rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
+ xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
+ if (!xInputStream.is())
+ {
+ //Try the passed in uri directly.
+ //For old documents prior OOo 3.0. We did not use URIs then.
+ xInputStream = m_xUriBinding->getUriBinding(
+ OUString::createFromAscii(uri));
+ }
+ }
+ if (xInputStream.is())
+ return 1;
+ else
+ return 0 ;
+}
+
+static void* xmlStreamOpen( const char* uri )
+{
+ css::uno::Reference< css::io::XInputStream > xInputStream ;
+
+ if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+ {
+ if( uri == nullptr || !m_xUriBinding.is() )
+ return nullptr ;
+
+ //see xmlStreamMatch
+ OUString sUri =
+ ::rtl::Uri::encode( OUString::createFromAscii( uri ),
+ rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
+ xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
+ if (!xInputStream.is())
+ {
+ //For old documents.
+ //try the passed in uri directly.
+ xInputStream = m_xUriBinding->getUriBinding(
+ OUString::createFromAscii(uri));
+ }
+
+ if( xInputStream.is() ) {
+ css::io::XInputStream* pInputStream ;
+ pInputStream = xInputStream.get() ;
+ pInputStream->acquire() ;
+ return static_cast<void*>(pInputStream) ;
+ }
+ }
+
+ return nullptr ;
+}
+
+static int xmlStreamRead( void* context, char* buffer, int len )
+{
+ int numbers ;
+ css::uno::Reference< css::io::XInputStream > xInputStream ;
+ css::uno::Sequence< sal_Int8 > outSeqs( len ) ;
+
+ numbers = 0 ;
+ if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+ {
+ if( context != nullptr ) {
+ xInputStream = static_cast<css::io::XInputStream*>(context);
+ if( !xInputStream.is() )
+ return 0 ;
+
+ numbers = xInputStream->readBytes( outSeqs, len ) ;
+ const sal_Int8* readBytes = outSeqs.getArray() ;
+ for( int i = 0 ; i < numbers ; i ++ )
+ *( buffer + i ) = *( readBytes + i ) ;
+ }
+ }
+
+ return numbers ;
+}
+
+static int xmlStreamClose( void * context )
+{
+ if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+ {
+ if( context != nullptr ) {
+ css::io::XInputStream* pInputStream ;
+ pInputStream = static_cast<css::io::XInputStream*>(context);
+ pInputStream->release() ;
+ }
+ }
+
+ return 0 ;
+}
+
+}
+
+int xmlEnableStreamInputCallbacks()
+{
+ if (!g_bInputCallbacksEnabled)
+ {
+ //Register the callbacks into xmlSec
+ //In order to make the xmlsec io finding the callbacks firstly,
+ //I put the callbacks at the very beginning.
+
+ //Cleanup the older callbacks.
+ //Notes: all none default callbacks will lose.
+ xmlSecIOCleanupCallbacks() ;
+
+ // Make sure that errors are reported via SAL_WARN().
+ setErrorRecorder();
+ comphelper::ScopeGuard g([] { clearErrorRecorder(); });
+
+ // Newer xmlsec wants the callback order in the opposite direction.
+ if (xmlSecCheckVersionExt(1, 2, 26, xmlSecCheckVersionABICompatible))
+ {
+ //Register the default callbacks.
+ //Notes: the error will cause xmlsec working problems.
+ int cbs = xmlSecIORegisterDefaultCallbacks() ;
+ if( cbs < 0 ) {
+ return -1 ;
+ }
+
+ //Register my classbacks.
+ cbs = xmlSecIORegisterCallbacks(
+ xmlStreamMatch,
+ xmlStreamOpen,
+ xmlStreamRead,
+ xmlStreamClose ) ;
+ if( cbs < 0 ) {
+ return -1 ;
+ }
+ }
+ else
+ {
+ //Register my classbacks.
+ int cbs = xmlSecIORegisterCallbacks(
+ xmlStreamMatch,
+ xmlStreamOpen,
+ xmlStreamRead,
+ xmlStreamClose ) ;
+ if( cbs < 0 ) {
+ return -1 ;
+ }
+
+ //Register the default callbacks.
+ //Notes: the error will cause xmlsec working problems.
+ cbs = xmlSecIORegisterDefaultCallbacks() ;
+ if( cbs < 0 ) {
+ return -1 ;
+ }
+ }
+
+ g_bInputCallbacksEnabled = true;
+ }
+
+ return 0 ;
+}
+
+int xmlRegisterStreamInputCallbacks(
+ css::uno::Reference< css::xml::crypto::XUriBinding > const & aUriBinding
+) {
+ if (!g_bInputCallbacksEnabled)
+ {
+ if( xmlEnableStreamInputCallbacks() < 0 )
+ return -1 ;
+ }
+
+ if (!g_bInputCallbacksRegistered)
+ g_bInputCallbacksRegistered = true;
+
+ m_xUriBinding = aUriBinding ;
+
+ return 0 ;
+}
+
+int xmlUnregisterStreamInputCallbacks()
+{
+ if (g_bInputCallbacksRegistered)
+ {
+ //Clear the uri-stream binding
+ m_xUriBinding.clear() ;
+
+ //disable the registered flag
+ g_bInputCallbacksRegistered = false;
+ }
+
+ return 0 ;
+}
+
+void xmlDisableStreamInputCallbacks() {
+ xmlUnregisterStreamInputCallbacks() ;
+ g_bInputCallbacksEnabled = false;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */