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/usr/include/xsec/canon/XSECCanon.hpp is in libxml-security-c-dev 1.7.2-3+b1.

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/**
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*
 * XSEC
 *
 * XSECCanon := Base (abstract) class for canonicalisation objects
 *
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: XSECCanon.hpp 1125514 2011-05-20 19:08:33Z scantor $
 */

// XSEC includes
#include <xsec/framework/XSECDefs.hpp>
#include <xsec/utils/XSECSafeBuffer.hpp>

XSEC_DECLARE_XERCES_CLASS(DOMNode)
XSEC_DECLARE_XERCES_CLASS(DOMDocument)

// --------------------------------------------------------------------------------
//           Defines
// --------------------------------------------------------------------------------

#define XSECCANNON_BUFFER_START_SIZE		8192		/* Default size for the outBuffer */


// --------------------------------------------------------------------------------
//           XSECCanon Virtual Class definition
// --------------------------------------------------------------------------------

// Most of the interface work is done within this class.  However the actual
// processing is done via the processNextNode virtual function that must be
// implemented by all children classes.

class CANON_EXPORT XSECCanon {

protected:

	// Data structures

	XERCES_CPP_NAMESPACE_QUALIFIER DOMDocument	* mp_doc;		// Xerces DOM Node that defines the document
	XERCES_CPP_NAMESPACE_QUALIFIER DOMNode		* mp_startNode,	// Node to start processing from
										*mp_nextNode;	// Next Node to be processeed
	safeBuffer							m_buffer;		// Buffer holding parsed output
	xsecsize_t							m_bufferLength,	// Length of input currently in buffer
										m_bufferPoint;	// Next "character" to copy out
	bool								m_allNodesDone;	// Have we completed?


public:

	// Constructors

	XSECCanon();
	XSECCanon(XERCES_CPP_NAMESPACE_QUALIFIER DOMDocument *newDoc);
	XSECCanon(
		XERCES_CPP_NAMESPACE_QUALIFIER DOMDocument *newDoc, 
		XERCES_CPP_NAMESPACE_QUALIFIER DOMNode *newStartNode);

	// Destructors

	virtual ~XSECCanon();

	// Public Methods

	// outputBuffer is used by all canonicalisers to output the next numBytes bytes of
	// canonicalised XML to the nominated buffer

	xsecsize_t outputBuffer(unsigned char *outBuffer, xsecsize_t numBytes);
	
	// setStartNode sets the starting point for the output if it is a sub-document 
	// that needs canonicalisation and we want to re-start
	
	bool setStartNode(XERCES_CPP_NAMESPACE_QUALIFIER DOMNode *newStartNode);

protected:

	// processNextNode is the pure virtual function that must be implemented by all canons

	virtual xsecsize_t processNextNode() = 0;

};