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

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

12 files changed, 3187 insertions, 0 deletions

diff --git a/xmlsecurity/source/framework/buffernode.cxx b/xmlsecurity/source/framework/buffernode.cxx
new file mode 100644
index 000000000..cc6c37c18
--- /dev/null
+++ b/xmlsecurity/source/framework/buffernode.cxx
@@ -0,0 +1,886 @@
+/* -*- 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 "elementmark.hxx"
+#include "elementcollector.hxx"
+#include "buffernode.hxx"
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+
+BufferNode::BufferNode( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement )
+    :m_pParent(nullptr),
+     m_pBlocker(nullptr),
+     m_bAllReceived(false),
+     m_xXMLElement(xXMLElement)
+{
+}
+
+bool BufferNode::isECOfBeforeModifyIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECOfBeforeModifyIncluded ********************************
+ *
+ *   NAME
+ *  isECOfBeforeModifyIncluded -- checks whether there is some
+ *  ElementCollector on this BufferNode, that has BEFORE-MODIFY priority.
+ *
+ *   SYNOPSIS
+ *  bExist = isECOfBeforeModifyIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each ElementCollector on this BufferNode, if all following
+ *  conditions are satisfied, then returns true:
+ *  1. the ElementCollector's priority is BEFOREMODIFY;
+ *  2. the ElementCollector's securityId can't be ignored.
+ *  otherwise, returns false.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise
+ ******************************************************************************/
+{
+    return std::any_of(m_vElementCollectors.cbegin(), m_vElementCollectors.cend(),
+        [nIgnoredSecurityId](const ElementCollector* pElementCollector) {
+            return (nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                    pElementCollector->getSecurityId() != nIgnoredSecurityId) &&
+                   (pElementCollector->getPriority() == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY);
+        });
+}
+
+void BufferNode::setReceivedAll()
+/****** BufferNode/setReceiveAll *********************************************
+ *
+ *   NAME
+ *  setReceivedAll -- indicates that the element in this BufferNode has
+ *  been completely buffered.
+ *
+ *   SYNOPSIS
+ *  setReceivedAll();
+ *
+ *   FUNCTION
+ *  sets the all-received flag and launches ElementCollector's notify
+ *  process.
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    m_bAllReceived = true;
+    elementCollectorNotify();
+}
+
+
+void BufferNode::addElementCollector(const ElementCollector* pElementCollector)
+/****** BufferNode/addElementCollector ***************************************
+ *
+ *   NAME
+ *  addElementCollector -- adds a new ElementCollector to this BufferNode.
+ *
+ *   SYNOPSIS
+ *  addElementCollector(pElementCollector);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pElementCollector - the ElementCollector to be added
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    m_vElementCollectors.push_back( pElementCollector );
+    const_cast<ElementCollector*>(pElementCollector)->setBufferNode(this);
+}
+
+void BufferNode::removeElementCollector(const ElementCollector* pElementCollector)
+/****** BufferNode/removeElementCollector ************************************
+ *
+ *   NAME
+ *  removeElementCollector -- removes an ElementCollector from this
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  removeElementCollector(pElementCollector);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pElementCollector - the ElementCollector to be removed
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    auto ii = std::find(m_vElementCollectors.begin(), m_vElementCollectors.end(), pElementCollector);
+    if (ii != m_vElementCollectors.end())
+    {
+        m_vElementCollectors.erase( ii );
+        const_cast<ElementCollector*>(pElementCollector)->setBufferNode(nullptr);
+    }
+}
+
+
+void BufferNode::setBlocker(const ElementMark* pBlocker)
+/****** BufferNode/setBlocker ************************************************
+ *
+ *   NAME
+ *  setBlocker -- adds a blocker to this BufferNode.
+ *
+ *   SYNOPSIS
+ *  setBlocker(pBlocker);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pBlocker - the new blocker to be attached
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  Because there is only one blocker permitted for a BufferNode, so the
+ *  old blocker on this BufferNode, if there is one, will be overcasted.
+ ******************************************************************************/
+{
+    OSL_ASSERT(!(m_pBlocker != nullptr && pBlocker != nullptr));
+
+    m_pBlocker = const_cast<ElementMark*>(pBlocker);
+    if (m_pBlocker != nullptr)
+    {
+        m_pBlocker->setBufferNode(this);
+    }
+}
+
+OUString BufferNode::printChildren() const
+/****** BufferNode/printChildren *********************************************
+ *
+ *   NAME
+ *  printChildren -- prints children information into a string.
+ *
+ *   SYNOPSIS
+ *  result = printChildren();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  result - the information string
+ ******************************************************************************/
+{
+    OUStringBuffer rc;
+
+    for( const ElementCollector* ii : m_vElementCollectors )
+    {
+        rc.append("BufID=" + OUString::number(ii->getBufferId()));
+
+        if (ii->getModify())
+        {
+            rc.append("[M]");
+        }
+
+        rc.append(",Pri=");
+
+        switch (ii->getPriority())
+        {
+            case css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY:
+                rc.append("BEFOREMODIFY");
+                break;
+            case css::xml::crypto::sax::ElementMarkPriority_AFTERMODIFY:
+                rc.append("AFTERMODIFY");
+                break;
+            default:
+                rc.append("UNKNOWN");
+                break;
+        }
+
+        rc.append("(SecID=" + OUString::number(ii->getSecurityId()) + ") ");
+    }
+
+    return rc.makeStringAndClear();
+}
+
+bool BufferNode::hasAnything() const
+/****** BufferNode/hasAnything ***********************************************
+ *
+ *   NAME
+ *  hasAnything -- checks whether there is any ElementCollector or blocker
+ *  on this BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = hasAnything();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  bExist - true if there is, false otherwise.
+ ******************************************************************************/
+{
+    return (m_pBlocker || !m_vElementCollectors.empty());
+}
+
+bool BufferNode::hasChildren() const
+/****** BufferNode/hasChildren ***********************************************
+ *
+ *   NAME
+ *  hasChildren -- checks whether this BufferNode has any child
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = hasChildren();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  bExist - true if there is, false otherwise.
+ ******************************************************************************/
+{
+    return (!m_vChildren.empty());
+}
+
+std::vector< std::unique_ptr<BufferNode> > const & BufferNode::getChildren() const
+{
+    return m_vChildren;
+}
+
+std::vector< std::unique_ptr<BufferNode> > BufferNode::releaseChildren()
+{
+    return std::move(m_vChildren);
+}
+
+const BufferNode* BufferNode::getFirstChild() const
+/****** BufferNode/getFirstChild *********************************************
+ *
+ *   NAME
+ *  getFirstChild -- retrieves the first child BufferNode.
+ *
+ *   SYNOPSIS
+ *  child = getFirstChild();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  child - the first child BufferNode, or NULL if there is no child
+ *          BufferNode.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (!m_vChildren.empty())
+    {
+        rc = m_vChildren.front().get();
+    }
+
+    return rc;
+}
+
+void BufferNode::addChild(std::unique_ptr<BufferNode> pChild, sal_Int32 nPosition)
+/****** BufferNode/addChild(pChild,nPosition) ********************************
+ *
+ *   NAME
+ *  addChild -- inserts a child BufferNode at specific position.
+ *
+ *   SYNOPSIS
+ *  addChild(pChild, nPosition);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild -    the child BufferNode to be added.
+ *  nPosition - the position where the new child locates.
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  If the nPosition is -1, then the new child BufferNode is appended
+ *  at the end.
+ ******************************************************************************/
+{
+    if (nPosition == -1)
+    {
+        m_vChildren.push_back( std::move(pChild) );
+    }
+    else
+    {
+        m_vChildren.insert(m_vChildren.begin() + nPosition, std::move(pChild));
+    }
+}
+
+void BufferNode::addChild(std::unique_ptr<BufferNode> pChild)
+/****** BufferNode/addChild() ************************************************
+ *
+ *   NAME
+ *  addChild -- add a new child BufferNode.
+ *
+ *   SYNOPSIS
+ *  addChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild -    the child BufferNode to be added.
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  The new child BufferNode is appended at the end.
+ ******************************************************************************/
+{
+    addChild(std::move(pChild), -1);
+}
+
+void BufferNode::removeChild(const BufferNode* pChild)
+/****** BufferNode/removeChild ***********************************************
+ *
+ *   NAME
+ *  removeChild -- removes and deletes a child BufferNode from the children list.
+ *
+ *   SYNOPSIS
+ *  removeChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode to be removed
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vChildren.begin(), m_vChildren.end(),
+                [pChild] (const std::unique_ptr<BufferNode>& i)
+                { return i.get() == pChild; });
+    if (ii != m_vChildren.end())
+        m_vChildren.erase( ii );
+}
+
+sal_Int32 BufferNode::indexOfChild(const BufferNode* pChild) const
+/****** BufferNode/indexOfChild **********************************************
+ *
+ *   NAME
+ *  indexOfChild -- gets the index of a child BufferNode.
+ *
+ *   SYNOPSIS
+ *  index = indexOfChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode whose index to be gotten
+ *
+ *   RESULT
+ *  index - the index of that child BufferNode. If that child BufferNode
+ *          is not found, -1 is returned.
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vChildren.begin(), m_vChildren.end(),
+            [pChild] (const std::unique_ptr<BufferNode>& i)
+            { return i.get() == pChild; });
+    if (ii == m_vChildren.end())
+        return -1;
+
+    return std::distance(m_vChildren.begin(), ii);
+}
+
+
+void BufferNode::setParent(const BufferNode* pParent)
+{
+    m_pParent = const_cast<BufferNode*>(pParent);
+}
+
+const BufferNode* BufferNode::getNextSibling() const
+/****** BufferNode/getNextSibling ********************************************
+ *
+ *   NAME
+ *  getNextSibling -- retrieves the next sibling BufferNode.
+ *
+ *   SYNOPSIS
+ *  sibling = getNextSibling();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  sibling - the next sibling BufferNode, or NULL if there is none.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (m_pParent != nullptr)
+    {
+        rc = const_cast<BufferNode*>(m_pParent->getNextChild(this));
+    }
+
+    return rc;
+}
+
+const BufferNode* BufferNode::isAncestor(const BufferNode* pDescendant) const
+/****** BufferNode/isAncestor ************************************************
+ *
+ *   NAME
+ *  isAncestor -- checks whether this BufferNode is an ancestor of another
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  bIs = isAncestor(pDescendant);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pDescendant -   the BufferNode to be checked as a descendant
+ *
+ *   RESULT
+ *  bIs -   true if this BufferNode is an ancestor of the pDescendant,
+ *          false otherwise.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (pDescendant != nullptr)
+    {
+        auto ii = std::find_if(m_vChildren.cbegin(), m_vChildren.cend(),
+            [&pDescendant](const std::unique_ptr<BufferNode>& pChild) {
+                return (pChild.get() == pDescendant) || (pChild->isAncestor(pDescendant) != nullptr);
+            });
+
+        if (ii != m_vChildren.end())
+            rc = ii->get();
+    }
+
+    return rc;
+}
+
+bool BufferNode::isPrevious(const BufferNode* pFollowing) const
+/****** BufferNode/isPrevious ************************************************
+ *
+ *   NAME
+ *  isPrevious -- checks whether this BufferNode is ahead of another
+ *  BufferNode in the tree order.
+ *
+ *   SYNOPSIS
+ *  bIs = isPrevious(pFollowing);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pFollowing -    the BufferNode to be checked as a following
+ *
+ *   RESULT
+ *  bIs -   true if this BufferNode is ahead in the tree order, false
+ *          otherwise.
+ ******************************************************************************/
+{
+    bool rc = false;
+
+    BufferNode* pNextBufferNode = const_cast<BufferNode*>(getNextNodeByTreeOrder());
+    while (pNextBufferNode != nullptr)
+    {
+        if (pNextBufferNode == pFollowing)
+        {
+            rc = true;
+            break;
+        }
+
+        pNextBufferNode = const_cast<BufferNode*>(pNextBufferNode->getNextNodeByTreeOrder());
+    }
+
+    return rc;
+}
+
+const BufferNode* BufferNode::getNextNodeByTreeOrder() const
+/****** BufferNode/getNextNodeByTreeOrder ************************************
+ *
+ *   NAME
+ *  getNextNodeByTreeOrder -- retrieves the next BufferNode in the tree
+ *  order.
+ *
+ *   SYNOPSIS
+ *  next = getNextNodeByTreeOrder();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  next -  the BufferNode following this BufferNode in the tree order,
+ *          or NULL if there is none.
+ *
+ *   NOTES
+ *  The "next" node in tree order is defined as:
+ *  1. If a node has children, then the first child is;
+ *  2. otherwise, if it has a following sibling, then this sibling node is;
+ *  3. otherwise, if it has a parent node, the parent's next sibling
+ *     node is;
+ *  4. otherwise, no "next" node exists.
+ ******************************************************************************/
+{
+    /*
+     * If this buffer node has m_vChildren, then return the first
+     * child.
+     */
+    if (hasChildren())
+    {
+        return getFirstChild();
+    }
+
+    /*
+     * Otherwise, it this buffer node has a following sibling,
+     * then return that sibling.
+     */
+    BufferNode* pNextSibling = const_cast<BufferNode*>(getNextSibling());
+    if (pNextSibling != nullptr)
+    {
+        return pNextSibling;
+    }
+
+    /*
+     * Otherwise, it this buffer node has parent, then return
+     * its parent's following sibling.
+     */
+    BufferNode* pNode = const_cast<BufferNode*>(this);
+    BufferNode* pParent;
+    BufferNode* pNextSiblingParent = nullptr;
+
+    do
+    {
+        if (pNode == nullptr)
+        {
+            break;
+        }
+
+        pParent = const_cast<BufferNode*>(pNode->getParent());
+        if (pParent != nullptr)
+        {
+            pNextSiblingParent = const_cast<BufferNode*>(pParent->getNextSibling());
+        }
+        pNode = pParent;
+
+    } while (pNextSiblingParent == nullptr);
+
+    return pNextSiblingParent;
+}
+
+
+void BufferNode::setXMLElement( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement )
+{
+    m_xXMLElement = xXMLElement;
+}
+
+void BufferNode::notifyBranch()
+/****** BufferNode/notifyBranch **********************************************
+ *
+ *   NAME
+ *  notifyBranch -- notifies each BufferNode in the branch of this
+ *  BufferNode in the tree order.
+ *
+ *   SYNOPSIS
+ *  notifyBranch();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    for( std::unique_ptr<BufferNode>& pBufferNode : m_vChildren )
+    {
+        pBufferNode->elementCollectorNotify();
+        pBufferNode->notifyBranch();
+    }
+}
+
+void BufferNode::elementCollectorNotify()
+/****** BufferNode/elementCollectorNotify ************************************
+ *
+ *   NAME
+ *  elementCollectorNotify -- notifies this BufferNode.
+ *
+ *   SYNOPSIS
+ *  elementCollectorNotify();
+ *
+ *   FUNCTION
+ *  Notifies this BufferNode if the notification is not suppressed.
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  child - the first child BufferNode, or NULL if there is no child
+ *          BufferNode.
+ ******************************************************************************/
+{
+    if (m_vElementCollectors.empty())
+        return;
+
+    css::xml::crypto::sax::ElementMarkPriority nMaxPriority = css::xml::crypto::sax::ElementMarkPriority_MINIMUM;
+    css::xml::crypto::sax::ElementMarkPriority nPriority;
+
+    /*
+     * get the max priority among ElementCollectors on this BufferNode
+     */
+    for( const ElementCollector* pElementCollector : m_vElementCollectors )
+    {
+        nPriority = pElementCollector->getPriority();
+        if (nPriority > nMaxPriority)
+        {
+            nMaxPriority = nPriority;
+        }
+    }
+
+    std::vector< const ElementCollector* > vElementCollectors( m_vElementCollectors );
+
+    for( const ElementCollector* ii : vElementCollectors )
+    {
+        ElementCollector* pElementCollector = const_cast<ElementCollector*>(ii);
+        nPriority = pElementCollector->getPriority();
+        bool bToModify = pElementCollector->getModify();
+
+        /*
+         * Only ElementCollector with the max priority can
+         * perform notify operation.
+         * Moreover, if any blocker exists in the subtree of
+         * this BufferNode, this ElementCollector can't do notify
+         * unless its priority is BEFOREMODIFY.
+         */
+        if (nPriority == nMaxPriority &&
+            (nPriority == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY ||
+             !isBlockerInSubTreeIncluded(pElementCollector->getSecurityId())))
+        {
+            /*
+             * If this ElementCollector will modify the buffered element, then
+             * special attention must be paid.
+             *
+             * If there is any ElementCollector in the subtree or any ancestor
+             * ElementCollector with PRI_BEFPREMODIFY priority, this
+             * ElementCollector can't perform notify operation, otherwise, it
+             * will destroy the buffered element, in turn, ElementCollectors
+             * mentioned above can't perform their mission.
+             */
+            //if (!(nMaxPriority == css::xml::crypto::sax::ElementMarkPriority_PRI_MODIFY &&
+            if (!(bToModify &&
+                 (isECInSubTreeIncluded(pElementCollector->getSecurityId()) ||
+                  isECOfBeforeModifyInAncestorIncluded(pElementCollector->getSecurityId()))
+               ))
+            {
+                pElementCollector->notifyListener();
+            }
+        }
+    }
+}
+
+bool BufferNode::isECInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECInSubTreeIncluded *************************************
+ *
+ *   NAME
+ *  isECInSubTreeIncluded -- checks whether there is any ElementCollector
+ *  in the branch of this BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = isECInSubTreeIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each BufferNode in the branch of this BufferNode, if there is
+ *  an ElementCollector whose signatureId is not ignored, then return
+ *  true, otherwise, false returned.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    bool rc = std::any_of(m_vElementCollectors.begin(), m_vElementCollectors.end(),
+        [nIgnoredSecurityId](const ElementCollector* pElementCollector) {
+            return nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                pElementCollector->getSecurityId() != nIgnoredSecurityId;
+    });
+
+    if ( !rc )
+    {
+        rc = std::any_of(m_vChildren.begin(), m_vChildren.end(),
+            [nIgnoredSecurityId](const std::unique_ptr<BufferNode>& pBufferNode) {
+                return pBufferNode->isECInSubTreeIncluded(nIgnoredSecurityId);
+        });
+    }
+
+    return rc;
+}
+
+bool BufferNode::isECOfBeforeModifyInAncestorIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECOfBeforeModifyInAncestorIncluded **********************
+ *
+ *   NAME
+ *  isECOfBeforeModifyInAncestorIncluded -- checks whether there is some
+ *  ancestor BufferNode which has ElementCollector with PRI_BEFPREMODIFY
+ *  priority.
+ *
+ *   SYNOPSIS
+ *  bExist = isECOfBeforeModifyInAncestorIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each ancestor BufferNode through the parent link, if there is
+ *  an ElementCollector with PRI_BEFPREMODIFY priority and its
+ *  signatureId is not ignored, then return true, otherwise, false
+ *  returned.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    bool rc = false;
+
+    BufferNode* pParentNode = m_pParent;
+    while (pParentNode != nullptr)
+    {
+        if (pParentNode->isECOfBeforeModifyIncluded(nIgnoredSecurityId))
+        {
+            rc = true;
+            break;
+        }
+
+        pParentNode = const_cast<BufferNode*>(pParentNode->getParent());
+    }
+
+    return rc;
+}
+
+bool BufferNode::isBlockerInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isBlockerInSubTreeIncluded ********************************
+ *
+ *   NAME
+ *  isBlockerInSubTreeIncluded -- checks whether there is some BufferNode
+ *  which has blocker on it
+ *
+ *   SYNOPSIS
+ *  bExist = isBlockerInSubTreeIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each BufferNode in the branch of this BufferNode, if one has
+ *  a blocker on it, and the blocker's securityId is not ignored, then
+ *  returns true; otherwise, false returns.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    return std::any_of(m_vChildren.begin(), m_vChildren.end(),
+        [nIgnoredSecurityId](const std::unique_ptr<BufferNode>& pBufferNode) {
+            ElementMark* pBlocker = pBufferNode->getBlocker();
+            return (pBlocker != nullptr &&
+                (nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                 pBlocker->getSecurityId() != nIgnoredSecurityId )) ||
+                pBufferNode->isBlockerInSubTreeIncluded(nIgnoredSecurityId);
+    });
+}
+
+const BufferNode* BufferNode::getNextChild(const BufferNode* pChild) const
+/****** BufferNode/getNextChild **********************************************
+ *
+ *   NAME
+ *  getNextChild -- get the next child BufferNode.
+ *
+ *   SYNOPSIS
+ *  nextChild = getNextChild();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode whose next node is retrieved.
+ *
+ *   RESULT
+ *  nextChild - the next child BufferNode after the pChild, or NULL if
+ *  there is none.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+    bool bChildFound = false;
+
+    for( std::unique_ptr<BufferNode> const & i : m_vChildren )
+    {
+        if (bChildFound)
+        {
+            rc = i.get();
+            break;
+        }
+
+        if( i.get() == pChild )
+        {
+            bChildFound = true;
+        }
+    }
+
+    return rc;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/buffernode.hxx b/xmlsecurity/source/framework/buffernode.hxx
new file mode 100644
index 000000000..0202195de
--- /dev/null
+++ b/xmlsecurity/source/framework/buffernode.hxx
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <memory>
+#include <vector>
+
+namespace com::sun::star::xml::wrapper
+{
+class XXMLElementWrapper;
+}
+
+class ElementMark;
+class ElementCollector;
+
+class BufferNode final
+/****** buffernode.hxx/CLASS BufferNode ***************************************
+ *
+ *   NAME
+ *  BufferNode -- Class to maintain the tree of buffered elements
+ *
+ *   FUNCTION
+ *  One BufferNode object represents a buffered element in the document
+ *  wrapper component.
+ *  All BufferNode objects construct a tree which has the same structure
+ *  of all buffered elements. That is to say, if one buffered element is
+ *  an ancestor of another buffered element, then the corresponding
+ *  BufferNode objects are also in ancestor/descendant relationship.
+ *  This class is used to manipulate the tree of buffered elements.
+ ******************************************************************************/
+{
+private:
+    /* the parent BufferNode */
+    BufferNode* m_pParent;
+
+    /* all child BufferNodes */
+    std::vector<std::unique_ptr<BufferNode>> m_vChildren;
+
+    /* all ElementCollector holding this BufferNode */
+    std::vector<const ElementCollector*> m_vElementCollectors;
+
+    /*
+     * the blocker holding this BufferNode, one BufferNode can have one
+     * blocker at most
+     */
+    ElementMark* m_pBlocker;
+
+    /*
+     * whether the element has completely buffered by the document wrapper
+     * component
+     */
+    bool m_bAllReceived;
+
+    /* the XMLElementWrapper of the buffered element */
+    css::uno::Reference<css::xml::wrapper::XXMLElementWrapper> m_xXMLElement;
+
+private:
+    bool isECInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isECOfBeforeModifyInAncestorIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isBlockerInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    const BufferNode* getNextChild(const BufferNode* pChild) const;
+
+public:
+    explicit BufferNode(
+        const css::uno::Reference<css::xml::wrapper::XXMLElementWrapper>& xXMLElement);
+
+    bool isECOfBeforeModifyIncluded(sal_Int32 nIgnoredSecurityId) const;
+    void setReceivedAll();
+    bool isAllReceived() const { return m_bAllReceived; }
+    void addElementCollector(const ElementCollector* pElementCollector);
+    void removeElementCollector(const ElementCollector* pElementCollector);
+    ElementMark* getBlocker() const { return m_pBlocker; }
+    void setBlocker(const ElementMark* pBlocker);
+    OUString printChildren() const;
+    bool hasAnything() const;
+    bool hasChildren() const;
+    std::vector<std::unique_ptr<BufferNode>> const& getChildren() const;
+    std::vector<std::unique_ptr<BufferNode>> releaseChildren();
+    const BufferNode* getFirstChild() const;
+    void addChild(std::unique_ptr<BufferNode> pChild, sal_Int32 nPosition);
+    void addChild(std::unique_ptr<BufferNode> pChild);
+    void removeChild(const BufferNode* pChild);
+    sal_Int32 indexOfChild(const BufferNode* pChild) const;
+    const BufferNode* getParent() const { return m_pParent; }
+    void setParent(const BufferNode* pParent);
+    const BufferNode* getNextSibling() const;
+    const BufferNode* isAncestor(const BufferNode* pDescendant) const;
+    bool isPrevious(const BufferNode* pFollowing) const;
+    const BufferNode* getNextNodeByTreeOrder() const;
+    const css::uno::Reference<css::xml::wrapper::XXMLElementWrapper>& getXMLElement() const
+    {
+        return m_xXMLElement;
+    }
+    void
+    setXMLElement(const css::uno::Reference<css::xml::wrapper::XXMLElementWrapper>& xXMLElement);
+    void notifyBranch();
+    void elementCollectorNotify();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementcollector.cxx b/xmlsecurity/source/framework/elementcollector.cxx
new file mode 100644
index 000000000..7801d6328
--- /dev/null
+++ b/xmlsecurity/source/framework/elementcollector.cxx
@@ -0,0 +1,137 @@
+/* -*- 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 "elementmark.hxx"
+#include "elementcollector.hxx"
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedListener.hpp>
+
+ElementCollector::ElementCollector(
+    sal_Int32 nBufferId,
+    css::xml::crypto::sax::ElementMarkPriority nPriority,
+    bool bToModify,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+    :ElementMark(css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID, nBufferId),
+     m_nPriority(nPriority),
+     m_bToModify(bToModify),
+     m_bAbleToNotify(false),
+     m_bNotified(false),
+     m_xReferenceResolvedListener(xReferenceResolvedListener)
+/****** ElementCollector/ElementCollector *************************************
+ *
+ *   NAME
+ *  ElementCollector -- constructor method
+ *
+ *   SYNOPSIS
+ *  ElementCollector(nSecurityId, nBufferId, nPriority, bToModify
+ *                   xReferenceResolvedListener);
+ *
+ *   FUNCTION
+ *  construct an ElementCollector object.
+ *
+ *   INPUTS
+ *  nSecurityId -   represents which security entity the buffer node is
+ *          related with. Either a signature or an encryption is
+ *          a security entity.
+ *  nBufferId - the id of the element buffered in the document
+ *          wrapper component. The document wrapper component
+ *          uses this id to search the particular buffered
+ *          element.
+ *  nPriority - the priority value. ElementCollector with lower
+ *          priority value can't notify until all ElementCollectors
+ *          with higher priority value have notified.
+ *  bToModify - A flag representing whether this ElementCollector
+ *          notification will cause the modification of its working
+ *                  element.
+ *  xReferenceResolvedListener
+ *            - the listener that this ElementCollector notifies to.
+ ******************************************************************************/
+{
+    m_type = css::xml::crypto::sax::ElementMarkType_ELEMENTCOLLECTOR;
+}
+
+
+void ElementCollector::notifyListener()
+/****** ElementCollector/notifyListener ***************************************
+ *
+ *   NAME
+ *  notifyListener -- enable the ability to notify the listener
+ *
+ *   SYNOPSIS
+ *  notifyListener();
+ *
+ *   FUNCTION
+ *  enable the ability to notify the listener and try to notify then.
+ ******************************************************************************/
+{
+    m_bAbleToNotify = true;
+    doNotify();
+}
+
+void ElementCollector::setReferenceResolvedListener(
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+/****** ElementCollector/setReferenceResolvedListener *************************
+ *
+ *   NAME
+ *  setReferenceResolvedListener -- configures a listener for the buffer
+ *  node in this object
+ *
+ *   SYNOPSIS
+ *  setReferenceResolvedListener(xReferenceResolvedListener);
+ *
+ *   FUNCTION
+ *  configures a new listener and try to notify then.
+ *
+ *   INPUTS
+ *  xReferenceResolvedListener - the new listener
+ ******************************************************************************/
+{
+    m_xReferenceResolvedListener = xReferenceResolvedListener;
+    doNotify();
+}
+
+void ElementCollector::doNotify()
+/****** ElementCollector/doNotify *********************************************
+ *
+ *   NAME
+ *  doNotify -- tries to notify the listener
+ *
+ *   SYNOPSIS
+ *  doNotify();
+ *
+ *   FUNCTION
+ *  notifies the listener when all below conditions are satisfied:
+ *  the listener has not been notified;
+ *  the notify right is granted;
+ *  the listener has already been configured;
+ *  the security id has already been configure
+ ******************************************************************************/
+{
+    if (!m_bNotified &&
+        m_bAbleToNotify &&
+        m_xReferenceResolvedListener.is() &&
+        m_nSecurityId != css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID)
+    {
+        m_bNotified = true;
+        m_xReferenceResolvedListener->referenceResolved(m_nBufferId);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementcollector.hxx b/xmlsecurity/source/framework/elementcollector.hxx
new file mode 100644
index 000000000..0f797572a
--- /dev/null
+++ b/xmlsecurity/source/framework/elementcollector.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 .
+ */
+
+#pragma once
+
+#include "elementmark.hxx"
+#include <com/sun/star/xml/crypto/sax/ElementMarkPriority.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star::xml::crypto::sax { class XReferenceResolvedListener; }
+
+class ElementCollector : public ElementMark
+/****** elementcollector.hxx/CLASS ElementCollector ***************************
+ *
+ *   NAME
+ *  ElementCollector -- Class to manipulate an element collector
+ *
+ *   FUNCTION
+ *  This class is derived from the ElementMark class. Beyond the function
+ *  of the ElementMark class, this class also maintains the priority, and
+ *  manages the notify process
+ ******************************************************************************/
+{
+private:
+    /*
+     * the notify priority, is one of following values:
+     * AFTERMODIFY  - this ElementCollector will notify after all
+     *                    internal modifications have finished.
+     * BEFOREMODIFY - this ElementCollector must notify before any
+     *                    internal modification happens.
+     */
+    css::xml::crypto::sax::ElementMarkPriority const m_nPriority;
+
+    /*
+     * the modify flag, representing whether which elementcollector will
+     * modify its data.
+     */
+    bool const m_bToModify;
+
+    /* the notify enable flag, see notifyListener method */
+    bool m_bAbleToNotify;
+
+    /* whether the listener has been notified */
+    bool m_bNotified;
+
+    /* the listener to be notified */
+    css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > m_xReferenceResolvedListener;
+
+public:
+    ElementCollector(
+        sal_Int32 nBufferId,
+        css::xml::crypto::sax::ElementMarkPriority nPriority,
+        bool bToModify,
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener);
+
+    css::xml::crypto::sax::ElementMarkPriority getPriority() const { return m_nPriority;}
+    bool getModify() const { return m_bToModify;}
+    void notifyListener();
+    void setReferenceResolvedListener(
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& referenceResolvedListener);
+    void doNotify();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementmark.cxx b/xmlsecurity/source/framework/elementmark.cxx
new file mode 100644
index 000000000..71444d7cd
--- /dev/null
+++ b/xmlsecurity/source/framework/elementmark.cxx
@@ -0,0 +1,64 @@
+/* -*- 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 "elementmark.hxx"
+
+ElementMark::ElementMark(sal_Int32 nSecurityId, sal_Int32 nBufferId)
+    :m_pBufferNode(nullptr),
+     m_nSecurityId(nSecurityId),
+     m_nBufferId(nBufferId),
+     m_type(css::xml::crypto::sax::ElementMarkType_ELEMENTMARK)
+/****** ElementMark/ElementMark ***********************************************
+ *
+ *   NAME
+ *  ElementMark -- constructor method
+ *
+ *   SYNOPSIS
+ *  ElementMark(nSecurityId, nBufferId);
+ *
+ *   FUNCTION
+ *  construct an ElementMark object.
+ *
+ *   INPUTS
+ *  nSecurityId -   represents which security entity the buffer node is
+ *          related with. Either a signature or an encryption is
+ *          a security entity.
+ *  nBufferId - the id of the element buffered in the document
+ *          wrapper component. The document wrapper component
+ *          uses this id to search the particular buffered
+ *          element.
+ ******************************************************************************/
+{
+}
+
+
+void ElementMark::setBufferNode(const BufferNode* pBufferNode)
+{
+    m_pBufferNode = const_cast<BufferNode*>(pBufferNode);
+}
+
+
+void ElementMark::setSecurityId(sal_Int32 nSecurityId)
+{
+    m_nSecurityId = nSecurityId;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementmark.hxx b/xmlsecurity/source/framework/elementmark.hxx
new file mode 100644
index 000000000..94ca71fdf
--- /dev/null
+++ b/xmlsecurity/source/framework/elementmark.hxx
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <com/sun/star/xml/crypto/sax/ElementMarkType.hpp>
+
+class BufferNode;
+
+class ElementMark
+/****** elementmark.hxx/CLASS ElementMark *************************************
+ *
+ *   NAME
+ *  ElementMark -- Class to manipulate an element mark
+ *
+ *   FUNCTION
+ *  This class maintains the security id, buffer id and its type for a
+ *  buffer node.
+ ******************************************************************************/
+{
+protected:
+    /* the BufferNode maintained by this object */
+    BufferNode* m_pBufferNode;
+
+    /* the security Id */
+    sal_Int32 m_nSecurityId;
+
+    /* the buffer Id */
+    sal_Int32 const m_nBufferId;
+
+    /*
+     * the type value, is one of following values:
+     * TYPEOFELEMENTMARK - the default value, represents a blocker if
+     *                     not changed
+     * TYPEOFELEMENTCOLLECTOR - represents an ElementCollector
+     */
+    css::xml::crypto::sax::ElementMarkType m_type;
+
+public:
+    ElementMark(sal_Int32 nSecurityId, sal_Int32 nBufferId);
+    virtual ~ElementMark(){};
+
+    BufferNode* getBufferNode() const { return m_pBufferNode; }
+    void setBufferNode(const BufferNode* pBufferNode);
+    sal_Int32 getSecurityId() const { return m_nSecurityId; }
+    void setSecurityId(sal_Int32 nSecurityId);
+    css::xml::crypto::sax::ElementMarkType getType() const { return m_type; }
+    sal_Int32 getBufferId() const { return m_nBufferId; }
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/saxeventkeeperimpl.cxx b/xmlsecurity/source/framework/saxeventkeeperimpl.cxx
new file mode 100644
index 000000000..b5a7f0272
--- /dev/null
+++ b/xmlsecurity/source/framework/saxeventkeeperimpl.cxx
@@ -0,0 +1,1152 @@
+/* -*- 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 <framework/saxeventkeeperimpl.hxx>
+#include "buffernode.hxx"
+#include "elementmark.hxx"
+#include "elementcollector.hxx"
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <com/sun/star/xml/wrapper/XXMLDocumentWrapper.hpp>
+#include <com/sun/star/xml/csax/XCompressedDocumentHandler.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+
+#include <algorithm>
+
+SAXEventKeeperImpl::SAXEventKeeperImpl( )
+    :m_pCurrentBufferNode(nullptr),
+     m_nNextElementMarkId(1),
+     m_pNewBlocker(nullptr),
+     m_pCurrentBlockingBufferNode(nullptr),
+     m_bIsReleasing(false),
+     m_bIsForwarding(false)
+{
+    m_vElementMarkBuffers.reserve(2);
+    m_vNewElementCollectors.reserve(2);
+    m_vReleasedElementMarkBuffers.reserve(2);
+}
+
+SAXEventKeeperImpl::~SAXEventKeeperImpl()
+{
+    /*
+     * delete the BufferNode tree
+     */
+    m_pRootBufferNode.reset();
+
+    m_pCurrentBufferNode = m_pCurrentBlockingBufferNode = nullptr;
+
+    /*
+     * delete all unfreed ElementMarks
+     */
+    m_vNewElementCollectors.clear();
+    m_pNewBlocker = nullptr;
+}
+
+void SAXEventKeeperImpl::setCurrentBufferNode(BufferNode* pBufferNode)
+/****** SAXEventKeeperImpl/setCurrentBufferNode ******************************
+ *
+ *   NAME
+ *  setCurrentBufferNode -- set a new active BufferNode.
+ *
+ *   SYNOPSIS
+ *  setCurrentBufferNode( pBufferNode );
+ *
+ *   FUNCTION
+ *  connects this BufferNode into the BufferNode tree as a child of the
+ *  current active BufferNode. Then makes this BufferNode as the current
+ *  active BufferNode.
+ *  If the previous active BufferNode points to the root
+ *  BufferNode, which means that no buffering operation was proceeding,
+ *  then notifies the status change listener that buffering  operation
+ *  will begin at once.
+ *
+ *   INPUTS
+ *  pBufferNode - a BufferNode which will be the new active BufferNode
+ ******************************************************************************/
+{
+    if (pBufferNode == m_pCurrentBufferNode)
+        return;
+
+    if ( m_pCurrentBufferNode == m_pRootBufferNode.get() &&
+         m_xSAXEventKeeperStatusChangeListener.is())
+    {
+        m_xSAXEventKeeperStatusChangeListener->collectionStatusChanged(true);
+    }
+
+    if (pBufferNode->getParent() == nullptr)
+    {
+        m_pCurrentBufferNode->addChild(std::unique_ptr<BufferNode>(pBufferNode));
+        pBufferNode->setParent(m_pCurrentBufferNode);
+    }
+
+    m_pCurrentBufferNode = pBufferNode;
+}
+
+BufferNode* SAXEventKeeperImpl::addNewElementMarkBuffers()
+/****** SAXEventKeeperImpl/addNewElementMarkBuffers **************************
+ *
+ *   NAME
+ *  addNewElementMarkBuffers -- add new ElementCollectors and new Blocker.
+ *
+ *   SYNOPSIS
+ *  pBufferNode = addNewElementMarkBuffers( );
+ *
+ *   FUNCTION
+ *  if there are new ElementCollector or new Blocker to be added, then
+ *  connect all of them with the current BufferNode. In case of the
+ *  current BufferNode doesn't exist, creates one.
+ *  Clears up the new ElementCollector list and the new Blocker pointer.
+ *
+ *   RESULT
+ *  pBufferNode - the BufferNode that has been connected with both new
+ *                ElementCollectors and new Blocker.
+ ******************************************************************************/
+{
+    BufferNode* pBufferNode = nullptr;
+
+    if (m_pNewBlocker || !m_vNewElementCollectors.empty() )
+    {
+        /*
+         * When the current BufferNode is right pointing to the current
+         * working element in the XMLDocumentWrapper component, then
+         * no new BufferNode is needed to create.
+         * This situation can only happen in the "Forwarding" mode.
+         */
+        if ( (m_pCurrentBufferNode != nullptr) &&
+             (m_xXMLDocument->isCurrent(m_pCurrentBufferNode->getXMLElement())))
+        {
+            pBufferNode = m_pCurrentBufferNode;
+        }
+        else
+        {
+            pBufferNode = new BufferNode(m_xXMLDocument->getCurrentElement());
+        }
+
+        if (m_pNewBlocker != nullptr)
+        {
+            pBufferNode->setBlocker(m_pNewBlocker);
+
+            /*
+             * If no blocking before, then notify the status change listener that
+             * the SAXEventKeeper has entered "blocking" status, during which, no
+             * SAX events will be forwarded to the next document handler.
+             */
+            if (m_pCurrentBlockingBufferNode == nullptr)
+            {
+                m_pCurrentBlockingBufferNode = pBufferNode;
+
+                if (m_xSAXEventKeeperStatusChangeListener.is())
+                {
+                    m_xSAXEventKeeperStatusChangeListener->blockingStatusChanged(true);
+                }
+            }
+
+            m_pNewBlocker = nullptr;
+        }
+
+        for( const auto& i : m_vNewElementCollectors )
+        {
+            pBufferNode->addElementCollector(i);
+        }
+        m_vNewElementCollectors.clear();
+    }
+
+    return pBufferNode;
+}
+
+ElementMark* SAXEventKeeperImpl::findElementMarkBuffer(sal_Int32 nId) const
+/****** SAXEventKeeperImpl/findElementMarkBuffer *****************************
+ *
+ *   NAME
+ *  findElementMarkBuffer -- finds an ElementMark.
+ *
+ *   SYNOPSIS
+ *  pElementMark = findElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  searches an ElementMark with the particular Id in the ElementMark
+ *  list.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark to be searched.
+ *
+ *   RESULT
+ *  pElementMark - the ElementMark with the particular Id, or NULL when
+ *                 no such Id exists.
+ ******************************************************************************/
+{
+    ElementMark* pElementMark = nullptr;
+
+    for( auto&& ii : m_vElementMarkBuffers )
+    {
+        if ( nId == ii->getBufferId())
+        {
+            pElementMark = const_cast<ElementMark*>(ii.get());
+            break;
+        }
+    }
+
+    return pElementMark;
+}
+
+void SAXEventKeeperImpl::removeElementMarkBuffer(sal_Int32 nId)
+/****** SAXEventKeeperImpl/removeElementMarkBuffer ***************************
+ *
+ *   NAME
+ *  removeElementMarkBuffer -- removes an ElementMark
+ *
+ *   SYNOPSIS
+ *  removeElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  removes an ElementMark with the particular Id in the ElementMark list.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark to be removed.
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vElementMarkBuffers.begin(), m_vElementMarkBuffers.end(),
+        [nId](std::unique_ptr<const ElementMark>& rElementMark) { return nId == rElementMark->getBufferId(); }
+    );
+    if (ii == m_vElementMarkBuffers.end())
+        return;
+
+    /*
+     * checks whether this ElementMark still in the new ElementCollect array
+     */
+    auto jj = std::find_if(m_vNewElementCollectors.begin(), m_vNewElementCollectors.end(),
+        [&ii](const ElementCollector* pElementCollector) { return ii->get() == pElementCollector; }
+    );
+    if (jj != m_vNewElementCollectors.end())
+        m_vNewElementCollectors.erase(jj);
+
+    /*
+     * checks whether this ElementMark is the new Blocker
+     */
+    if (ii->get() == m_pNewBlocker)
+    {
+        m_pNewBlocker = nullptr;
+    }
+
+    m_vElementMarkBuffers.erase( ii );
+}
+
+OUString SAXEventKeeperImpl::printBufferNode(
+    BufferNode const * pBufferNode, sal_Int32 nIndent) const
+/****** SAXEventKeeperImpl/printBufferNode ***********************************
+ *
+ *   NAME
+ *  printBufferNode -- retrieves the information of a BufferNode and its
+ *  branch.
+ *
+ *   SYNOPSIS
+ *  info = printBufferNode( pBufferNode, nIndent );
+ *
+ *   FUNCTION
+ *  all retrieved information includes:
+ *  1. whether it is the current BufferNode;
+ *  2. whether it is the current blocking BufferNode;
+ *  3. the name of the parent element;
+ *  4. the name of this element;
+ *  5. all ElementCollectors working on this BufferNode;
+ *  6. the Blocker working on this BufferNode;
+ *  7. all child BufferNodes' information.
+ *
+ *   INPUTS
+ *  pBufferNode -   the BufferNode from where information will be retrieved.
+ *  nIndent -   how many space characters prefixed before the output
+ *              message.
+ *
+ *   RESULT
+ *  info - the information string
+ ******************************************************************************/
+{
+    OUStringBuffer rc;
+
+    for ( int i=0; i<nIndent; ++i )
+    {
+        rc.append(" ");
+    }
+
+    if (pBufferNode == m_pCurrentBufferNode)
+    {
+        rc.append("[%]");
+    }
+
+    if (pBufferNode == m_pCurrentBlockingBufferNode)
+    {
+        rc.append("[B]");
+    }
+
+    rc.append(" " + m_xXMLDocument->getNodeName(pBufferNode->getXMLElement()));
+
+    BufferNode* pParent = const_cast<BufferNode*>(pBufferNode->getParent());
+    if (pParent != nullptr)
+    {
+        rc.append("[" + m_xXMLDocument->getNodeName(pParent->getXMLElement()) + "]");
+    }
+
+    rc.append(":EC=" + pBufferNode->printChildren() + " BR=");
+
+    ElementMark * pBlocker = pBufferNode->getBlocker();
+    if (pBlocker != nullptr)
+    {
+        rc.append( OUString::number(pBlocker->getBufferId()) +
+            "(SecId=" + OUString::number( pBlocker->getSecurityId() ) + ") ");
+    }
+    rc.append("\n");
+
+    std::vector< std::unique_ptr<BufferNode> > const & vChildren = pBufferNode->getChildren();
+    for( const auto& jj : vChildren )
+    {
+        rc.append(printBufferNode(jj.get(), nIndent+4));
+    }
+
+    return rc.makeStringAndClear();
+}
+
+css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+    SAXEventKeeperImpl::collectChildWorkingElement(BufferNode const * pBufferNode)
+/****** SAXEventKeeperImpl/collectChildWorkingElement ************************
+ *
+ *   NAME
+ *  collectChildWorkingElement -- collects a BufferNode's all child
+ *  Elements.
+ *
+ *   SYNOPSIS
+ *  list = collectChildWorkingElement( pBufferNode );
+ *
+ *   INPUTS
+ *  pBufferNode - the BufferNode whose child Elements will be collected.
+ *
+ *   RESULT
+ *  list - the child Elements list.
+ ******************************************************************************/
+{
+    std::vector< std::unique_ptr<BufferNode> > const & vChildren = pBufferNode->getChildren();
+
+    css::uno::Sequence < css::uno::Reference<
+        css::xml::wrapper::XXMLElementWrapper > > aChildrenCollection ( vChildren.size());
+
+    std::transform(vChildren.begin(), vChildren.end(), aChildrenCollection.getArray(),
+                   [](const auto& i) { return i->getXMLElement(); });
+
+    return aChildrenCollection;
+}
+
+void SAXEventKeeperImpl::smashBufferNode(
+    BufferNode* pBufferNode, bool bClearRoot) const
+/****** SAXEventKeeperImpl/smashBufferNode ***********************************
+ *
+ *   NAME
+ *  smashBufferNode -- removes a BufferNode along with its working
+ *  element.
+ *
+ *   SYNOPSIS
+ *  smashBufferNode( pBufferNode, bClearRoot );
+ *
+ *   FUNCTION
+ *  removes the BufferNode's working element from the DOM document, while
+ *  reserves all ancestor paths for its child BufferNodes.
+ *  when any of the BufferNode's ancestor element is useless, removes it
+ *  too.
+ *  removes the BufferNode from the BufferNode tree.
+ *
+ *   INPUTS
+ *  pBufferNode -   the BufferNode to be removed
+ *  bClearRoot -    whether the root element also needs to be cleared up.
+ *
+ *   NOTES
+ *  when removing a Blocker's BufferNode, the bClearRoot flag should be
+ *  true. Because a Blocker can buffer many SAX events which are not used
+ *  by any other ElementCollector or Blocker.
+ *  When the bClearRoot is set to true, the root BufferNode will be first
+ *  cleared, with a stop flag setting at the next Blocking BufferNode. This
+ *  operation can delete all useless buffered SAX events which are only
+ *  needed by the Blocker to be deleted.
+ ******************************************************************************/
+{
+    if (pBufferNode->hasAnything())
+        return;
+
+    BufferNode* pParent = const_cast<BufferNode*>(pBufferNode->getParent());
+
+    /*
+     * delete the XML data
+     */
+    if (pParent == m_pRootBufferNode.get())
+    {
+        bool bIsNotBlocking = (m_pCurrentBlockingBufferNode == nullptr);
+        bool bIsBlockInside = false;
+        bool bIsBlockingAfterward = false;
+
+        /*
+         * If this is a blocker, then remove any out-element data
+         * which caused by blocking. The removal process will stop
+         * at the next blocker to avoid removing any useful data.
+         */
+        if (bClearRoot)
+        {
+            css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+                aChildElements = collectChildWorkingElement(m_pRootBufferNode.get());
+
+            /*
+             * the clearUselessData only clearup the content in the
+             * node, not the node itself.
+             */
+            m_xXMLDocument->clearUselessData(m_pRootBufferNode->getXMLElement(),
+                aChildElements,
+                bIsNotBlocking?nullptr:
+                               (m_pCurrentBlockingBufferNode->getXMLElement()));
+
+            /*
+             * remove the node if it is empty, then if its parent is also
+             * empty, remove it, then if the next parent is also empty,
+             * remove it,..., until parent become null.
+             */
+            m_xXMLDocument->collapse( m_pRootBufferNode->getXMLElement() );
+        }
+
+        /*
+         * if blocking, check the relationship between this BufferNode and
+         * the current blocking BufferNode.
+         */
+        if ( !bIsNotBlocking )
+        {
+            /*
+             * the current blocking BufferNode is a descendant of this BufferNode.
+             */
+            bIsBlockInside = (nullptr != pBufferNode->isAncestor(m_pCurrentBlockingBufferNode));
+
+            /*
+             * the current blocking BufferNode locates behind this BufferNode in tree
+             * order.
+             */
+            bIsBlockingAfterward = pBufferNode->isPrevious(m_pCurrentBlockingBufferNode);
+        }
+
+        /*
+         * this BufferNode's working element needs to be deleted only when
+         * 1. there is no blocking, or
+         * 2. the current blocking BufferNode is a descendant of this BufferNode,
+         *    (then in the BufferNode's working element, the useless data before the blocking
+         *     element should be deleted.) or
+         * 3. the current blocking BufferNode is locates behind this BufferNode in tree,
+         *    (then the useless data between the blocking element and the working element
+         *     should be deleted.).
+         * Otherwise, this working element should not be deleted.
+         */
+        if ( bIsNotBlocking || bIsBlockInside || bIsBlockingAfterward )
+        {
+            css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+                aChildElements = collectChildWorkingElement(pBufferNode);
+
+            /*
+             * the clearUselessData only clearup the content in the
+             * node, not the node itself.
+             */
+            m_xXMLDocument->clearUselessData(pBufferNode->getXMLElement(),
+                aChildElements,
+                bIsBlockInside?(m_pCurrentBlockingBufferNode->getXMLElement()):
+                           nullptr);
+
+            /*
+             * remove the node if it is empty, then if its parent is also
+             * empty, remove it, then if the next parent is also empty,
+             * remove it,..., until parent become null.
+             */
+            m_xXMLDocument->collapse( pBufferNode->getXMLElement() );
+        }
+    }
+
+    sal_Int32 nIndex = pParent->indexOfChild(pBufferNode);
+
+    std::vector< std::unique_ptr<BufferNode> > vChildren = pBufferNode->releaseChildren();
+    pParent->removeChild(pBufferNode); // delete buffernode
+
+    for( auto& i : vChildren )
+    {
+        i->setParent(pParent);
+        pParent->addChild(std::move(i), nIndex);
+        nIndex++;
+    }
+}
+
+BufferNode* SAXEventKeeperImpl::findNextBlockingBufferNode(
+    BufferNode* pStartBufferNode)
+/****** SAXEventKeeperImpl/findNextBlockingBufferNode ************************
+ *
+ *   NAME
+ *  findNextBlockingBufferNode -- finds the next blocking BufferNode
+ *  behind the particular BufferNode.
+ *
+ *   SYNOPSIS
+ *  pBufferNode = findNextBlockingBufferNode( pStartBufferNode );
+ *
+ *   INPUTS
+ *  pStartBufferNode - the BufferNode from where to search the next
+ *                     blocking BufferNode.
+ *
+ *   RESULT
+ *  pBufferNode - the next blocking BufferNode, or NULL if no such
+ *                BufferNode exists.
+ ******************************************************************************/
+{
+    BufferNode* pNext = nullptr;
+
+    if (pStartBufferNode != nullptr)
+    {
+        pNext = pStartBufferNode;
+
+        while (nullptr != (pNext = const_cast<BufferNode*>(pNext->getNextNodeByTreeOrder())))
+        {
+            if (pNext->getBlocker() != nullptr)
+            {
+                break;
+            }
+        }
+    }
+
+    return pNext;
+}
+
+void SAXEventKeeperImpl::diffuse(BufferNode* pBufferNode)
+/****** SAXEventKeeperImpl/diffuse *******************************************
+ *
+ *   NAME
+ *  diffuse -- diffuse the notification.
+ *
+ *   SYNOPSIS
+ *  diffuse( pBufferNode );
+ *
+ *   FUNCTION
+ *  diffuse the collecting completion notification from the specific
+ *  BufferNode along its parent link, until an ancestor which is not
+ *  completely received is met.
+ *
+ *   INPUTS
+ *  pBufferNode - the BufferNode from which the notification will be
+ *                diffused.
+ ******************************************************************************/
+{
+    BufferNode* pParent = pBufferNode;
+
+    while(pParent->isAllReceived())
+    {
+        pParent->elementCollectorNotify();
+        pParent = const_cast<BufferNode*>(pParent->getParent());
+    }
+}
+
+void SAXEventKeeperImpl::releaseElementMarkBuffer()
+/****** SAXEventKeeperImpl/releaseElementMarkBuffer **************************
+ *
+ *   NAME
+ *  releaseElementMarkBuffer -- releases useless ElementMarks
+ *
+ *   SYNOPSIS
+ *  releaseElementMarkBuffer( );
+ *
+ *   FUNCTION
+ *  releases each ElementMark in the releasing list
+ *  m_vReleasedElementMarkBuffers.
+ *  The operation differs between an ElementCollector and a Blocker.
+ ******************************************************************************/
+{
+    m_bIsReleasing = true;
+    while (!m_vReleasedElementMarkBuffers.empty())
+    {
+        auto pId = m_vReleasedElementMarkBuffers.begin();
+        sal_Int32 nId = *pId;
+        m_vReleasedElementMarkBuffers.erase( pId );
+
+        ElementMark* pElementMark = findElementMarkBuffer(nId);
+
+        if (pElementMark != nullptr)
+        {
+            if (css::xml::crypto::sax::ElementMarkType_ELEMENTCOLLECTOR
+                == pElementMark->getType())
+            /*
+             * it is a EC
+             */
+            {
+                ElementCollector* pElementCollector = static_cast<ElementCollector*>(pElementMark);
+
+                css::xml::crypto::sax::ElementMarkPriority nPriority = pElementCollector->getPriority();
+                /*
+                 * Delete the EC from the buffer node.
+                 */
+                BufferNode* pBufferNode = pElementCollector->getBufferNode();
+                pBufferNode->removeElementCollector(pElementCollector);
+
+                if ( nPriority == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY)
+                {
+                    pBufferNode->notifyBranch();
+                }
+
+                /*
+                 * delete the ElementMark
+                 */
+                pElementCollector = nullptr;
+                pElementMark = nullptr;
+                removeElementMarkBuffer(nId);
+
+                /*
+                 * delete the BufferNode
+                 */
+                diffuse(pBufferNode);
+                smashBufferNode(pBufferNode, false);
+            }
+            else
+            /*
+             * it is a Blocker
+             */
+            {
+                /*
+                 * Delete the TH from the buffer node.
+                 */
+                BufferNode *pBufferNode = pElementMark->getBufferNode();
+                pBufferNode->setBlocker(nullptr);
+
+                /*
+                 * If there is a following handler and no blocking now, then
+                 * forward this event
+                 */
+                if (m_pCurrentBlockingBufferNode == pBufferNode)
+                {
+                    /*
+                     * Before forwarding, the next blocking point needs to be
+                     * found.
+                     */
+                    m_pCurrentBlockingBufferNode = findNextBlockingBufferNode(pBufferNode);
+
+                    /*
+                     * Forward the blocked events between these two STHs.
+                     */
+                    if (m_xNextHandler.is())
+                    {
+                        BufferNode* pTempCurrentBufferNode = m_pCurrentBufferNode;
+                        BufferNode* pTempCurrentBlockingBufferNode = m_pCurrentBlockingBufferNode;
+
+                        m_pCurrentBufferNode = pBufferNode;
+                        m_pCurrentBlockingBufferNode = nullptr;
+
+                        m_bIsForwarding = true;
+
+                        m_xXMLDocument->generateSAXEvents(
+                            m_xNextHandler,
+                            this,
+                            pBufferNode->getXMLElement(),
+                            (pTempCurrentBlockingBufferNode == nullptr)?nullptr:(pTempCurrentBlockingBufferNode->getXMLElement()));
+
+                        m_bIsForwarding = false;
+
+                        m_pCurrentBufferNode = pTempCurrentBufferNode;
+                        if (m_pCurrentBlockingBufferNode == nullptr)
+                        {
+                            m_pCurrentBlockingBufferNode = pTempCurrentBlockingBufferNode;
+                        }
+                    }
+
+                    if (m_pCurrentBlockingBufferNode == nullptr &&
+                        m_xSAXEventKeeperStatusChangeListener.is())
+                    {
+                        m_xSAXEventKeeperStatusChangeListener->blockingStatusChanged(false);
+                    }
+                }
+
+                /*
+                 * delete the ElementMark
+                 */
+                pElementMark = nullptr;
+                removeElementMarkBuffer(nId);
+
+                /*
+                 * delete the BufferNode
+                 */
+                diffuse(pBufferNode);
+                smashBufferNode(pBufferNode, true);
+            }
+        }
+    }
+
+    m_bIsReleasing = false;
+
+    if (!m_pRootBufferNode->hasAnything() &&
+        !m_pRootBufferNode->hasChildren() &&
+        m_xSAXEventKeeperStatusChangeListener.is())
+    {
+        m_xSAXEventKeeperStatusChangeListener->bufferStatusChanged(true);
+    }
+}
+
+void SAXEventKeeperImpl::markElementMarkBuffer(sal_Int32 nId)
+/****** SAXEventKeeperImpl/markElementMarkBuffer *****************************
+ *
+ *   NAME
+ *  markElementMarkBuffer -- marks an ElementMark to be released
+ *
+ *   SYNOPSIS
+ *  markElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  puts the ElementMark with the particular Id into the releasing list,
+ *  checks whether the releasing process is running, if not then launch
+ *  this process.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark which will be released
+ ******************************************************************************/
+{
+    m_vReleasedElementMarkBuffers.push_back( nId );
+    if ( !m_bIsReleasing )
+    {
+        releaseElementMarkBuffer();
+    }
+}
+
+sal_Int32 SAXEventKeeperImpl::createElementCollector(
+    css::xml::crypto::sax::ElementMarkPriority nPriority,
+    bool bModifyElement,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+/****** SAXEventKeeperImpl/createElementCollector ****************************
+ *
+ *   NAME
+ *  createElementCollector -- creates a new ElementCollector on the
+ *  incoming element.
+ *
+ *   SYNOPSIS
+ *  nId = createElementCollector( nSecurityId, nPriority,
+ *                               bModifyElement,
+ *                               xReferenceResolvedListener );
+ *
+ *   FUNCTION
+ *  allocs a new Id, then create an ElementCollector with this Id value.
+ *  Add the new created ElementCollector to the new ElementCollecotor list.
+ *
+ *   INPUTS
+ *  nPriority -     the priority of the new ElementCollector
+ *  bModifyElement -whether this BufferNode will modify the content of
+ *                  the corresponding element it works on
+ *  xReferenceResolvedListener - the listener for the new ElementCollector.
+ *
+ *   RESULT
+ *  nId - the Id of the new ElementCollector
+ ******************************************************************************/
+{
+    sal_Int32 nId = m_nNextElementMarkId;
+    m_nNextElementMarkId ++;
+
+    ElementCollector* pElementCollector
+        = new ElementCollector(
+            nId,
+            nPriority,
+            bModifyElement,
+            xReferenceResolvedListener);
+
+    m_vElementMarkBuffers.push_back(
+        std::unique_ptr<const ElementMark>(pElementCollector));
+
+    /*
+     * All the new EC to initial EC array.
+     */
+    m_vNewElementCollectors.push_back( pElementCollector );
+
+    return nId;
+}
+
+
+sal_Int32 SAXEventKeeperImpl::createBlocker()
+/****** SAXEventKeeperImpl/createBlocker *************************************
+ *
+ *   NAME
+ *  createBlocker -- creates a new Blocker on the incoming element.
+ *
+ *   SYNOPSIS
+ *  nId = createBlocker( nSecurityId );
+ *
+ *   RESULT
+ *  nId - the Id of the new Blocker
+ ******************************************************************************/
+{
+    sal_Int32 nId = m_nNextElementMarkId;
+    m_nNextElementMarkId ++;
+
+    OSL_ASSERT(m_pNewBlocker == nullptr);
+
+    m_pNewBlocker = new ElementMark(css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID, nId);
+    m_vElementMarkBuffers.push_back(
+        std::unique_ptr<const ElementMark>(m_pNewBlocker));
+
+    return nId;
+}
+
+/* XSAXEventKeeper */
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addElementCollector(  )
+{
+    return createElementCollector(
+        css::xml::crypto::sax::ElementMarkPriority_AFTERMODIFY,
+        false,
+        nullptr);
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeElementCollector( sal_Int32 id )
+{
+    markElementMarkBuffer(id);
+}
+
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addBlocker(  )
+{
+    return createBlocker();
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeBlocker( sal_Int32 id )
+{
+    markElementMarkBuffer(id);
+}
+
+sal_Bool SAL_CALL SAXEventKeeperImpl::isBlocking(  )
+{
+    return (m_pCurrentBlockingBufferNode != nullptr);
+}
+
+css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL
+    SAXEventKeeperImpl::getElement( sal_Int32 id )
+{
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > rc;
+
+    ElementMark* pElementMark = findElementMarkBuffer(id);
+    if (pElementMark != nullptr)
+    {
+        rc = pElementMark->getBufferNode()->getXMLElement();
+    }
+
+    return rc;
+}
+
+void SAL_CALL SAXEventKeeperImpl::setElement(
+    sal_Int32 id,
+    const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& aElement )
+{
+    if (aElement.is())
+    {
+        m_xXMLDocument->rebuildIDLink(aElement);
+
+        ElementMark* pElementMark = findElementMarkBuffer(id);
+
+        if (pElementMark != nullptr)
+        {
+            BufferNode* pBufferNode = pElementMark->getBufferNode();
+            if (pBufferNode != nullptr)
+            {
+                const bool bIsCurrent = m_xXMLDocument->isCurrent(pBufferNode->getXMLElement());
+                pBufferNode->setXMLElement(aElement);
+
+                if (bIsCurrent)
+                {
+                    m_xXMLDocument->setCurrentElement(aElement);
+                }
+            }
+        }
+    }
+    else
+    {
+        removeElementCollector( id );
+    }
+}
+
+css::uno::Reference< css::xml::sax::XDocumentHandler > SAL_CALL SAXEventKeeperImpl::setNextHandler(
+    const css::uno::Reference< css::xml::sax::XDocumentHandler >& xNewHandler )
+{
+    css::uno::Reference< css::xml::sax::XDocumentHandler > xOldHandler = m_xNextHandler;
+
+    m_xNextHandler = xNewHandler;
+    return xOldHandler;
+}
+
+OUString SAL_CALL SAXEventKeeperImpl::printBufferNodeTree()
+{
+    OUString rc = "ElementMarkBuffers: size = "
+        + OUString::number(m_vElementMarkBuffers.size())
+        + "\nCurrentBufferNode: "
+        + m_xXMLDocument->getNodeName(m_pCurrentBufferNode->getXMLElement())
+        + "\n" + printBufferNode(m_pRootBufferNode.get(), 0);
+
+    return rc;
+}
+
+css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL SAXEventKeeperImpl::getCurrentBlockingNode()
+{
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > rc;
+
+    if (m_pCurrentBlockingBufferNode != nullptr)
+    {
+        rc = m_pCurrentBlockingBufferNode->getXMLElement();
+    }
+
+    return rc;
+}
+
+/* XSecuritySAXEventKeeper */
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addSecurityElementCollector(
+    css::xml::crypto::sax::ElementMarkPriority priority,
+    sal_Bool modifyElement )
+{
+    return createElementCollector(
+        priority,
+        modifyElement,
+        nullptr);
+}
+
+void SAL_CALL SAXEventKeeperImpl::setSecurityId( sal_Int32 id, sal_Int32 securityId )
+{
+    ElementMark* pElementMark = findElementMarkBuffer(id);
+    if (pElementMark != nullptr)
+    {
+        pElementMark->setSecurityId(securityId);
+    }
+}
+
+
+/* XReferenceResolvedBroadcaster */
+void SAL_CALL SAXEventKeeperImpl::addReferenceResolvedListener(
+    sal_Int32 referenceId,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& listener )
+{
+    ElementCollector* pElementCollector = static_cast<ElementCollector*>(findElementMarkBuffer(referenceId));
+    if (pElementCollector != nullptr)
+    {
+        pElementCollector->setReferenceResolvedListener(listener);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeReferenceResolvedListener(
+    sal_Int32 /*referenceId*/,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >&)
+{
+}
+
+/* XSAXEventKeeperStatusChangeBroadcaster */
+void SAL_CALL SAXEventKeeperImpl::addSAXEventKeeperStatusChangeListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >& listener )
+{
+    m_xSAXEventKeeperStatusChangeListener = listener;
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeSAXEventKeeperStatusChangeListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >&)
+{
+}
+
+/* XDocumentHandler */
+void SAL_CALL SAXEventKeeperImpl::startDocument(  )
+{
+    if ( m_xNextHandler.is())
+    {
+        m_xNextHandler->startDocument();
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::endDocument(  )
+{
+    if ( m_xNextHandler.is())
+    {
+        m_xNextHandler->endDocument();
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::startElement(
+    const OUString& aName,
+    const css::uno::Reference< css::xml::sax::XAttributeList >& xAttribs )
+{
+    /*
+     * If there is a following handler and no blocking now, then
+     * forward this event
+     */
+    if ((m_pCurrentBlockingBufferNode == nullptr) &&
+        (m_xNextHandler.is()) &&
+        (!m_bIsForwarding) &&
+        (m_pNewBlocker == nullptr))
+    {
+        m_xNextHandler->startElement(aName, xAttribs);
+    }
+    /*
+     * If not forwarding, buffer this startElement.
+     */
+    if (!m_bIsForwarding)
+    {
+        sal_Int32 nLength = xAttribs->getLength();
+        css::uno::Sequence< css::xml::csax::XMLAttribute > aAttributes (nLength);
+        auto aAttributesRange = asNonConstRange(aAttributes);
+
+        for ( int i = 0; i<nLength; ++i )
+        {
+            aAttributesRange[i].sName = xAttribs->getNameByIndex(static_cast<short>(i));
+            aAttributesRange[i].sValue =xAttribs->getValueByIndex(static_cast<short>(i));
+        }
+
+        m_xCompressedDocumentHandler->compressedStartElement(aName, aAttributes);
+    }
+
+    BufferNode* pBufferNode = addNewElementMarkBuffers();
+    if (pBufferNode != nullptr)
+    {
+        setCurrentBufferNode(pBufferNode);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::endElement( const OUString& aName )
+{
+    const bool bIsCurrent = m_xXMLDocument->isCurrent(m_pCurrentBufferNode->getXMLElement());
+
+    /*
+     * If there is a following handler and no blocking now, then
+     * forward this event
+     */
+    if ((m_pCurrentBlockingBufferNode == nullptr) &&
+        (m_xNextHandler.is()) &&
+        (!m_bIsForwarding))
+    {
+        m_xNextHandler->endElement(aName);
+    }
+
+    if ((m_pCurrentBlockingBufferNode != nullptr) ||
+        (m_pCurrentBufferNode != m_pRootBufferNode.get()) ||
+        (!m_xXMLDocument->isCurrentElementEmpty()))
+    {
+        if (!m_bIsForwarding)
+        {
+            m_xCompressedDocumentHandler->compressedEndElement(aName);
+        }
+
+        /*
+        * If the current buffer node has not notified yet, and
+        * the current buffer node is waiting for the current element,
+        * then let it notify.
+        */
+        if (bIsCurrent && (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+        {
+            BufferNode* pOldCurrentBufferNode = m_pCurrentBufferNode;
+            m_pCurrentBufferNode = const_cast<BufferNode*>(m_pCurrentBufferNode->getParent());
+
+            pOldCurrentBufferNode->setReceivedAll();
+
+            if ((m_pCurrentBufferNode == m_pRootBufferNode.get()) &&
+                m_xSAXEventKeeperStatusChangeListener.is())
+            {
+                m_xSAXEventKeeperStatusChangeListener->collectionStatusChanged(false);
+            }
+        }
+    }
+    else
+    {
+        if (!m_bIsForwarding)
+        {
+            m_xXMLDocument->removeCurrentElement();
+        }
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::characters( const OUString& aChars )
+{
+    if (m_bIsForwarding)
+        return;
+
+    if ((m_pCurrentBlockingBufferNode == nullptr) && m_xNextHandler.is())
+    {
+        m_xNextHandler->characters(aChars);
+    }
+
+    if ((m_pCurrentBlockingBufferNode != nullptr) ||
+        (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+    {
+        m_xCompressedDocumentHandler->compressedCharacters(aChars);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    characters( aWhitespaces );
+}
+
+void SAL_CALL SAXEventKeeperImpl::processingInstruction(
+    const OUString& aTarget, const OUString& aData )
+{
+    if (m_bIsForwarding)
+        return;
+
+    if ((m_pCurrentBlockingBufferNode == nullptr) && m_xNextHandler.is())
+    {
+        m_xNextHandler->processingInstruction(aTarget, aData);
+    }
+
+    if ((m_pCurrentBlockingBufferNode != nullptr) ||
+        (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+    {
+        m_xCompressedDocumentHandler->compressedProcessingInstruction(aTarget, aData);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::setDocumentLocator( const css::uno::Reference< css::xml::sax::XLocator >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SAXEventKeeperImpl::initialize( const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 1);
+
+    aArguments[0] >>= m_xXMLDocument;
+    m_xDocumentHandler.set( m_xXMLDocument, css::uno::UNO_QUERY );
+    m_xCompressedDocumentHandler.set( m_xXMLDocument, css::uno::UNO_QUERY );
+
+    m_pRootBufferNode.reset( new BufferNode(m_xXMLDocument->getCurrentElement()) );
+    m_pCurrentBufferNode = m_pRootBufferNode.get();
+}
+
+OUString SAXEventKeeperImpl_getImplementationName ()
+{
+    return "com.sun.star.xml.security.framework.SAXEventKeeperImpl";
+}
+
+css::uno::Sequence< OUString > SAXEventKeeperImpl_getSupportedServiceNames(  )
+{
+    return { "com.sun.star.xml.crypto.sax.SAXEventKeeper" };
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SAXEventKeeperImpl::getImplementationName(  )
+{
+    return SAXEventKeeperImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SAXEventKeeperImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SAXEventKeeperImpl::getSupportedServiceNames(  )
+{
+    return SAXEventKeeperImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/securityengine.cxx b/xmlsecurity/source/framework/securityengine.cxx
new file mode 100644
index 000000000..e276163d4
--- /dev/null
+++ b/xmlsecurity/source/framework/securityengine.cxx
@@ -0,0 +1,67 @@
+/* -*- 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 <framework/securityengine.hxx>
+
+
+SecurityEngine::SecurityEngine()
+    :m_nIdOfTemplateEC(-1),
+     m_nNumOfResolvedReferences(0),
+     m_nIdOfKeyEC(-1),
+     m_bMissionDone(false),
+     m_nSecurityId(-1),
+     m_nStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN)
+{
+}
+
+/* XReferenceResolvedListener */
+void SAL_CALL SecurityEngine::referenceResolved( sal_Int32 /*referenceId*/)
+{
+    m_nNumOfResolvedReferences++;
+    tryToPerform();
+}
+
+/* XKeyCollector */
+void SAL_CALL SecurityEngine::setKeyId( sal_Int32 id )
+{
+    m_nIdOfKeyEC = id;
+    tryToPerform();
+}
+
+/* XMissionTaker */
+sal_Bool SAL_CALL SecurityEngine::endMission(  )
+{
+    bool rc = m_bMissionDone;
+
+    if (!rc)
+    {
+        clearUp( );
+
+        notifyResultListener();
+        m_bMissionDone = true;
+    }
+
+    m_xResultListener = nullptr;
+    m_xSAXEventKeeper = nullptr;
+
+    return rc;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signaturecreatorimpl.cxx b/xmlsecurity/source/framework/signaturecreatorimpl.cxx
new file mode 100644
index 000000000..4371b7ae6
--- /dev/null
+++ b/xmlsecurity/source/framework/signaturecreatorimpl.cxx
@@ -0,0 +1,175 @@
+/* -*- 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 <framework/signaturecreatorimpl.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <com/sun/star/xml/crypto/XXMLSignatureTemplate.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+
+namespace com::sun::star::xml::wrapper { class XXMLElementWrapper; }
+
+using namespace com::sun::star::uno;
+
+SignatureCreatorImpl::SignatureCreatorImpl()
+    :  m_nIdOfBlocker(-1)
+{
+}
+
+SignatureCreatorImpl::~SignatureCreatorImpl( )
+{
+}
+
+void SignatureCreatorImpl::notifyResultListener() const
+/****** SignatureCreatorImpl/notifyResultListener *****************************
+ *
+ *   NAME
+ *  notifyResultListener -- notifies the listener about the signature
+ *  creation result.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >
+        xSignatureCreationResultListener ( m_xResultListener , css::uno::UNO_QUERY ) ;
+
+    xSignatureCreationResultListener->signatureCreated( m_nSecurityId, m_nStatus );
+}
+
+void SignatureCreatorImpl::startEngine(const rtl::Reference<XMLSignatureTemplateImpl>& xSignatureTemplate)
+/****** SignatureCreatorImpl/startEngine *************************************
+ *
+ *   NAME
+ *  startEngine -- generates the signature.
+ *
+ *   FUNCTION
+ *  generates the signature element, then if succeeds, updates the link
+ *  of old template element to the new signature element in
+ *  SAXEventKeeper.
+ *
+ *   INPUTS
+ *  xSignatureTemplate - the signature template (along with all referenced
+ *  elements) to be signed.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > xResultTemplate;
+    try
+    {
+        xResultTemplate = m_xXMLSignature->generate(css::uno::Reference<css::xml::crypto::XXMLSignatureTemplate>(xSignatureTemplate), m_xSecurityEnvironment);
+        m_nStatus = xResultTemplate->getStatus();
+    }
+    catch( css::uno::Exception& )
+    {
+        m_nStatus = css::xml::crypto::SecurityOperationStatus_RUNTIMEERROR_FAILED;
+    }
+
+    if (m_nStatus == css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED)
+    {
+        css::uno::Reference < css::xml::wrapper::XXMLElementWrapper > xResultSignature = xResultTemplate->getTemplate();
+        m_xSAXEventKeeper->setElement(m_nIdOfTemplateEC, xResultSignature);
+    }
+}
+
+void SignatureCreatorImpl::clearUp() const
+/****** SignatureCreatorImpl/clearUp *****************************************
+ *
+ *   NAME
+ *  clearUp -- clear up all resources used by the signature generation.
+ *
+ *   SYNOPSIS
+ *  clearUp( );
+ *
+ *   FUNCTION
+ *  cleaning resources up includes:
+ *  1. SignatureEngine's clearing up;
+ *  2. releases the Blocker for the signature template element.
+ ******************************************************************************/
+{
+    SignatureEngine::clearUp();
+
+    if (m_nIdOfBlocker != -1)
+    {
+        m_xSAXEventKeeper->removeBlocker(m_nIdOfBlocker);
+    }
+}
+
+/* XBlockerMonitor */
+void SAL_CALL SignatureCreatorImpl::setBlockerId( sal_Int32 id )
+{
+    m_nIdOfBlocker = id;
+    tryToPerform();
+}
+
+/* XSignatureCreationResultBroadcaster */
+void SAL_CALL SignatureCreatorImpl::addSignatureCreationResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >& listener )
+{
+    m_xResultListener = listener;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureCreatorImpl::removeSignatureCreationResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SignatureCreatorImpl::initialize( const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 5);
+
+    OUString ouTempString;
+
+    aArguments[0] >>= ouTempString;
+    m_nSecurityId = ouTempString.toInt32();
+    aArguments[1] >>= m_xSAXEventKeeper;
+    aArguments[2] >>= ouTempString;
+    m_nIdOfTemplateEC = ouTempString.toInt32();
+    aArguments[3] >>= m_xSecurityEnvironment;
+    aArguments[4] >>= m_xXMLSignature;
+}
+
+
+OUString SignatureCreatorImpl_getImplementationName ()
+{
+    return "com.sun.star.xml.security.framework.SignatureCreatorImpl";
+}
+
+css::uno::Sequence< OUString > SignatureCreatorImpl_getSupportedServiceNames(  )
+{
+    return { "com.sun.star.xml.crypto.sax.SignatureCreator" };
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SignatureCreatorImpl::getImplementationName(  )
+{
+    return SignatureCreatorImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SignatureCreatorImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SignatureCreatorImpl::getSupportedServiceNames(  )
+{
+    return SignatureCreatorImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signatureengine.cxx b/xmlsecurity/source/framework/signatureengine.cxx
new file mode 100644
index 000000000..0390ea7e6
--- /dev/null
+++ b/xmlsecurity/source/framework/signatureengine.cxx
@@ -0,0 +1,197 @@
+/* -*- 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 <framework/signatureengine.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <rtl/ref.hxx>
+
+namespace com::sun::star::xml::wrapper { class XXMLElementWrapper; }
+
+using namespace com::sun::star::uno;
+
+SignatureEngine::SignatureEngine()
+    : m_nTotalReferenceNumber(-1)
+{
+}
+
+bool SignatureEngine::checkReady() const
+/****** SignatureEngine/checkReady *******************************************
+ *
+ *   NAME
+ *  checkReady -- checks the conditions for the main operation.
+ *
+ *   SYNOPSIS
+ *  bReady = checkReady( );
+ *
+ *   FUNCTION
+ *  checks whether all following conditions are satisfied:
+ *  1. the main operation has't begun yet;
+ *  2. the key material is known;
+ *  3. the amount of reference is known;
+ *  4. all of referenced elements, the key element and the signature
+ *     template are buffered.
+ *
+ *   RESULT
+ *  bReady - true if all conditions are satisfied, false otherwise
+ ******************************************************************************/
+{
+    bool rc = true;
+
+    sal_Int32 nKeyInc = 0;
+    if (m_nIdOfKeyEC != 0)
+    {
+        nKeyInc = 1;
+    }
+
+    if (m_bMissionDone ||
+        m_nIdOfKeyEC == -1 ||
+        m_nTotalReferenceNumber == -1 ||
+        m_nTotalReferenceNumber+1+nKeyInc > m_nNumOfResolvedReferences)
+    {
+        rc = false;
+    }
+
+    return rc;
+}
+
+void SignatureEngine::tryToPerform( )
+/****** SignatureEngine/tryToPerform *****************************************
+ *
+ *   NAME
+ *  tryToPerform -- tries to perform the signature operation.
+ *
+ *   FUNCTION
+ *  if the situation is ready, perform following operations.
+ *  1. prepares a signature template;
+ *  2. calls the signature bridge component;
+ *  3. clears up all used resources;
+ *  4. notifies the result listener;
+ *  5. sets the "accomplishment" flag.
+ ******************************************************************************/
+{
+    if (!checkReady())
+        return;
+
+    rtl::Reference<XMLSignatureTemplateImpl> xSignatureTemplate = new XMLSignatureTemplateImpl();
+
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >
+        xXMLElement = m_xSAXEventKeeper->getElement( m_nIdOfTemplateEC );
+
+    xSignatureTemplate->setTemplate(xXMLElement);
+
+    for( const auto i : m_vReferenceIds )
+    {
+        xXMLElement = m_xSAXEventKeeper->getElement( i );
+        xSignatureTemplate->setTarget(xXMLElement);
+    }
+
+    /*
+     * set the Uri binding
+     */
+    xSignatureTemplate->setBinding( this );
+
+    startEngine(xSignatureTemplate);
+
+    /*
+     * done
+     */
+    clearUp( );
+
+    notifyResultListener();
+
+    m_bMissionDone = true;
+}
+
+void SignatureEngine::clearUp( ) const
+/****** SignatureEngine/clearUp **********************************************
+ *
+ *   NAME
+ *  clearUp -- clear up all resources used by this operation.
+ *
+ *   FUNCTION
+ *  cleaning resources up includes:
+ *  1. releases the ElementCollector for the signature template element;
+ *  2. releases ElementCollectors for referenced elements;
+ *  3. releases the ElementCollector for the key element, if there is one.
+ ******************************************************************************/
+{
+    css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedBroadcaster >
+        xReferenceResolvedBroadcaster( m_xSAXEventKeeper, css::uno::UNO_QUERY );
+    xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
+        m_nIdOfTemplateEC,
+        static_cast<const css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedListener > >(static_cast<SecurityEngine *>(const_cast<SignatureEngine *>(this))));
+
+    m_xSAXEventKeeper->removeElementCollector(m_nIdOfTemplateEC);
+
+    for( const auto& i : m_vReferenceIds )
+    {
+        xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
+            i,
+            static_cast<const css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedListener > >(static_cast<SecurityEngine *>(const_cast<SignatureEngine *>(this))));
+        m_xSAXEventKeeper->removeElementCollector(i);
+    }
+
+    if (m_nIdOfKeyEC != 0 && m_nIdOfKeyEC != -1)
+    {
+        m_xSAXEventKeeper->removeElementCollector(m_nIdOfKeyEC);
+    }
+}
+
+/* XReferenceCollector */
+void SAL_CALL SignatureEngine::setReferenceCount( sal_Int32 count )
+{
+    m_nTotalReferenceNumber = count;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureEngine::setReferenceId( sal_Int32 id )
+{
+    m_vReferenceIds.push_back( id );
+}
+
+/* XUriBinding */
+void SAL_CALL SignatureEngine::setUriBinding(
+    const OUString& uri,
+    const css::uno::Reference< css::io::XInputStream >& aInputStream )
+{
+    m_vUris.push_back(uri);
+    m_vXInputStreams.push_back(aInputStream);
+}
+
+css::uno::Reference< css::io::XInputStream > SAL_CALL SignatureEngine::getUriBinding( const OUString& uri )
+{
+    css::uno::Reference< css::io::XInputStream > xInputStream;
+
+    int size = m_vUris.size();
+
+    for( int i=0; i<size; ++i)
+    {
+        if (m_vUris[i] == uri)
+        {
+            xInputStream = m_vXInputStreams[i];
+            break;
+        }
+    }
+
+    return xInputStream;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signatureverifierimpl.cxx b/xmlsecurity/source/framework/signatureverifierimpl.cxx
new file mode 100644
index 000000000..44e9e4c0a
--- /dev/null
+++ b/xmlsecurity/source/framework/signatureverifierimpl.cxx
@@ -0,0 +1,130 @@
+/* -*- 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 <framework/signatureverifierimpl.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <com/sun/star/xml/crypto/XXMLSignatureTemplate.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+
+
+SignatureVerifierImpl::SignatureVerifierImpl()
+{
+}
+
+SignatureVerifierImpl::~SignatureVerifierImpl()
+{
+}
+
+void SignatureVerifierImpl::notifyResultListener() const
+/****** SignatureVerifierImpl/notifyResultListener ***************************
+ *
+ *   NAME
+ *  notifyResultListener -- notifies the listener about the verify result.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >
+        xSignatureVerifyResultListener ( m_xResultListener , css::uno::UNO_QUERY ) ;
+
+    xSignatureVerifyResultListener->signatureVerified( m_nSecurityId, m_nStatus );
+}
+
+void SignatureVerifierImpl::startEngine( const rtl::Reference<XMLSignatureTemplateImpl>& xSignatureTemplate)
+/****** SignatureVerifierImpl/startEngine ************************************
+ *
+ *   NAME
+ *  startEngine -- verifies the signature.
+ *
+ *   INPUTS
+ *  xSignatureTemplate - the signature template (along with all referenced
+ *  elements) to be verified.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > xResultTemplate;
+    try
+    {
+        xResultTemplate = m_xXMLSignature->validate(css::uno::Reference<css::xml::crypto::XXMLSignatureTemplate>(xSignatureTemplate), m_xXMLSecurityContext);
+        m_nStatus = xResultTemplate->getStatus();
+    }
+    catch( css::uno::Exception& )
+    {
+        m_nStatus = css::xml::crypto::SecurityOperationStatus_RUNTIMEERROR_FAILED;
+    }
+}
+
+/* XSignatureVerifyResultBroadcaster */
+void SAL_CALL SignatureVerifierImpl::addSignatureVerifyResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >& listener )
+{
+    m_xResultListener = listener;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureVerifierImpl::removeSignatureVerifyResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SignatureVerifierImpl::initialize(
+    const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 5);
+
+    OUString ouTempString;
+
+    aArguments[0] >>= ouTempString;
+    m_nSecurityId = ouTempString.toInt32();
+    aArguments[1] >>= m_xSAXEventKeeper;
+    aArguments[2] >>= ouTempString;
+    m_nIdOfTemplateEC = ouTempString.toInt32();
+    aArguments[3] >>= m_xXMLSecurityContext;
+    aArguments[4] >>= m_xXMLSignature;
+}
+
+
+OUString SignatureVerifierImpl_getImplementationName ()
+{
+    return "com.sun.star.xml.security.framework.SignatureVerifierImpl";
+}
+
+css::uno::Sequence< OUString > SignatureVerifierImpl_getSupportedServiceNames(  )
+{
+    return { "com.sun.star.xml.crypto.sax.SignatureVerifier" };
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SignatureVerifierImpl::getImplementationName(  )
+{
+    return SignatureVerifierImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SignatureVerifierImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SignatureVerifierImpl::getSupportedServiceNames(  )
+{
+    return SignatureVerifierImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx b/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx
new file mode 100644
index 000000000..203f0fea2
--- /dev/null
+++ b/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx
@@ -0,0 +1,113 @@
+/* -*- 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 <rtl/ustring.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <comphelper/sequence.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::com::sun::star::uno ;
+using ::com::sun::star::lang::XMultiServiceFactory ;
+
+using ::com::sun::star::xml::wrapper::XXMLElementWrapper ;
+using ::com::sun::star::xml::crypto::XXMLSignatureTemplate ;
+
+XMLSignatureTemplateImpl::XMLSignatureTemplateImpl()
+    :m_nStatus ( css::xml::crypto::SecurityOperationStatus_UNKNOWN )
+{
+}
+
+XMLSignatureTemplateImpl::~XMLSignatureTemplateImpl() {
+}
+
+/* XXMLSignatureTemplate */
+void SAL_CALL XMLSignatureTemplateImpl::setTemplate( const Reference< XXMLElementWrapper >& aTemplate )
+{
+    m_xTemplate = aTemplate ;
+}
+
+/* XXMLSignatureTemplate */
+Reference< XXMLElementWrapper > SAL_CALL XMLSignatureTemplateImpl::getTemplate()
+{
+    return m_xTemplate ;
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setTarget( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& aXmlElement )
+{
+    targets.push_back( aXmlElement );
+}
+
+css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > > SAL_CALL XMLSignatureTemplateImpl::getTargets()
+{
+    return comphelper::containerToSequence(targets);
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setBinding(
+    const css::uno::Reference< css::xml::crypto::XUriBinding >& aUriBinding )
+{
+    m_xUriBinding = aUriBinding;
+}
+
+css::uno::Reference< css::xml::crypto::XUriBinding > SAL_CALL XMLSignatureTemplateImpl::getBinding()
+{
+    return m_xUriBinding;
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setStatus(
+    css::xml::crypto::SecurityOperationStatus status )
+{
+    m_nStatus = status;
+}
+
+css::xml::crypto::SecurityOperationStatus SAL_CALL XMLSignatureTemplateImpl::getStatus(  )
+{
+    return m_nStatus;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignatureTemplateImpl::getImplementationName() {
+    return impl_getImplementationName() ;
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignatureTemplateImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSignatureTemplateImpl::getSupportedServiceNames() {
+    return impl_getSupportedServiceNames() ;
+}
+
+//Helper for XServiceInfo
+Sequence< OUString > XMLSignatureTemplateImpl::impl_getSupportedServiceNames() {
+    Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSignatureTemplate" };
+    return seqServiceNames ;
+}
+
+OUString XMLSignatureTemplateImpl::impl_getImplementationName() {
+    return "com.sun.star.xml.security.framework.XMLSignatureTemplateImpl" ;
+}
+
+//Helper for registry
+Reference< XInterface > XMLSignatureTemplateImpl::impl_createInstance( const Reference< XMultiServiceFactory >&  ) {
+    return Reference< XInterface >( *new XMLSignatureTemplateImpl ) ;
+}
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */