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diff --git a/xmlsecurity/source/framework/signatureengine.hxx b/xmlsecurity/source/framework/signatureengine.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _SIGNATUREENGINE_HXX
+#define _SIGNATUREENGINE_HXX
+
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedListener.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedBroadcaster.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/XKeyCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/XMissionTaker.hpp>
+#include <com/sun/star/xml/crypto/sax/XSAXEventKeeper.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+#include <com/sun/star/xml/crypto/XXMLSignature.hpp>
+#include <com/sun/star/xml/crypto/XUriBinding.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+
+#include <cppuhelper/implbase2.hxx>
+
+#include "securityengine.hxx"
+
+#ifndef INCLUDED_VECTOR
+#include <vector>
+#define INCLUDED_VECTOR
+#endif
+
+class SignatureEngine : public cppu::ImplInheritanceHelper2
+<
+    SecurityEngine,
+    com::sun::star::xml::crypto::sax::XReferenceCollector,
+    com::sun::star::xml::crypto::XUriBinding
+>
+/****** signatureengine.hxx/CLASS SignatureEngine *****************************
+ *
+ *   NAME
+ *  SignatureEngine -- Base class of SignatureCreator and SignatureVerifier
+ *
+ *   FUNCTION
+ *  Maintains common members and methods related with signature operation.
+ *
+ *   HISTORY
+ *  05.01.2004 -    Interface supported: XReferenceCollector
+ *
+ *   AUTHOR
+ *  Michael Mi
+ *  Email: michael.mi@sun.com
+ ******************************************************************************/
+{
+protected:
+
+    /*
+     * the Signature bridge component, which performs signature generation
+     * and verification based on xmlsec library.
+     */
+    com::sun::star::uno::Reference<
+        com::sun::star::xml::crypto::XXMLSignature > m_xXMLSignature;
+
+    /*
+     * a collection of ElementCollector's ids. Each ElementCollector
+     * represents one element signed by this signature.
+     */
+    std::vector< sal_Int32 > m_vReferenceIds;
+
+    /*
+     * remembers how many references this signature has.
+     */
+    sal_Int32 m_nTotalReferenceNumber;
+
+    /*
+     * a collection of Uri binding.
+     *
+     * the m_vUris is used to hold the Uri strings, and the m_vXInputStreams is used
+     * to hold corresponding binded XInputStream interface.
+     */
+    std::vector< rtl::OUString > m_vUris;
+    std::vector< com::sun::star::uno::Reference<
+        com::sun::star::io::XInputStream > > m_vXInputStreams;
+
+protected:
+    SignatureEngine( );
+    virtual ~SignatureEngine() {};
+
+    virtual void tryToPerform( )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+    virtual void clearUp( ) const;
+    virtual bool checkReady() const;
+
+    /*
+     * starts the main function. This method will be implemented by any sub-class.
+     * For a SignatureCreator, it performs signing operation;
+     * for a SignatureVerifier, verification operation is performed.
+     */
+    virtual void startEngine( const com::sun::star::uno::Reference<
+                              com::sun::star::xml::crypto::XXMLSignatureTemplate >&)
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException)
+        {};
+
+public:
+    /* XReferenceCollector */
+    virtual void SAL_CALL setReferenceCount( sal_Int32 count )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+
+    virtual void SAL_CALL setReferenceId( sal_Int32 id )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+
+    /* XUriBinding */
+    virtual void SAL_CALL setUriBinding(
+        const rtl::OUString& uri,
+        const com::sun::star::uno::Reference<
+            com::sun::star::io::XInputStream >& aInputStream )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+    virtual com::sun::star::uno::Reference< com::sun::star::io::XInputStream >
+        SAL_CALL getUriBinding( const rtl::OUString& uri )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */