Application: gvSIG desktop » gvSIG data provider for DWG

/*

 * Created on 09-ene-2007

 *

 * gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib��ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: IDwg2FMap.java 29001 2009-05-26 15:32:46Z jmvivo $

* $Log$

* Revision 1.2.2.2  2007-03-21 19:49:16  azabala

* implementation of dwg 12, 13, 14.

*

* Revision 1.3  2007/03/20 19:55:27  azabala

* source code cleaning

*

* Revision 1.2  2007/01/18 13:35:22  azabala

* Refactoring general para evitar dar tantas pasadas en la carga, y para incrementar

* la legibilidad del codigo (demasiados if-else-if en vez de usar polimorfismo)

*

* Revision 1.1  2007/01/12 19:29:58  azabala

* first version in cvs

*

*

*/

package org.gvsig.dwg.lib;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

/**

 * All dwg objects that are drawing entities

 * and that can be converted to a fmap geometry

 * implements this interface.

 *

 * */

/*

 * TODO

 * Esta solucion tiene el problema de que es mas simple

 * (cada entidad dwg se ocupa de su conversion a fmap),pero acopla

 * libDwg con fmap

 * (una clase Dwg2FMap lo desacoplar�a, pero llenar�a el codigo de

 * infinitos if(dwg instanceof ...) else if.....

 *

 * */

public interface IDwg2FMap {

	public Geometry toFMapGeometry(boolean is3DFile) throws CreateGeometryException;

	public String toFMapString(boolean is3DFile);

	public int getGeometryType();

	public int getGeometrySubType(boolean is3DFile);

	public String toString();

}

/* jdwglib. Java Library for reading Dwg files.

 *

 * Author: Jose Morell Rama (jose.morell@gmail.com).

 * Port from the Pythoncad Dwg library by Art Haas.

 *

 * Copyright (C) 2005 Jose Morell, IVER TI S.A. and Generalitat Valenciana

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * Jose Morell (jose.morell@gmail.com)

 *

 * or

 *

 * IVER TI S.A.

 *  C/Salamanca, 50

 *  46005 Valencia

 *  Spain

 *  +34 963163400

 *  dac@iver.es

 */

package org.gvsig.dwg.lib;

import java.awt.geom.Point2D;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.gvsig.dwg.lib.objects.DwgBlockHeader;

import org.gvsig.dwg.lib.objects.DwgInsert;

import org.gvsig.dwg.lib.objects.DwgLayer;

import org.gvsig.dwg.lib.readers.DwgFileV12Reader;

import org.gvsig.dwg.lib.readers.DwgFileV14Reader;

import org.gvsig.dwg.lib.readers.DwgFileV15Reader;

import org.gvsig.dwg.lib.readers.DwgFileVR2004Reader;

import org.gvsig.dwg.lib.readers.IDwgFileReader;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * The DwgFile class provides a revision-neutral interface for reading and handling

 * DWG files

 * Reading methods are useful for reading DWG files, and handling methods like

 * calculateDwgPolylines() are useful for handling more complex

 * objects in the DWG file

 *

 * @author jmorell

 * @author azabala

 */

public class DwgFile {

	/**

	 * It has all known DWG version's header.

	 * Extracted from Autodesk web.

	 */

	private static HashMap acadVersions = new HashMap();

	static{

		acadVersions.put("AC1004", "Autocad R9");

		acadVersions.put("AC1006", "Autocad R10");

		acadVersions.put("AC1007", "Autocad pre-R11");

		acadVersions.put("AC1007", "Autocad pre-R11");

		acadVersions.put("AC1008", "Autocad pre-R11b");

		acadVersions.put("AC1009", "Autocad R12");

		acadVersions.put("AC1010", "Autocad pre-R13 a");

		acadVersions.put("AC1011", "Autocad pre-R13 b");

		acadVersions.put("AC1012", "Autocad R13");

		acadVersions.put("AC1013", "Autocad pre-R14");

		acadVersions.put("AC1014", "Autocad R14");

		acadVersions.put("AC1500", "Autocad pre-2000");

		acadVersions.put("AC1015", "Autocad R2000, R2000i, R2002");

		acadVersions.put("AC402a", "Autocad pre-2004a");

		acadVersions.put("AC402b", "Autocad pre-2004b");

		acadVersions.put("AC1018", "Autocad R2004, R2005, R2006");

		acadVersions.put("AC1021", "Autocad R2007");

	}

	private static Logger logger = LoggerFactory.getLogger(DwgFile.class.getName());

	/**

	 * Path and name of the dwg file

	 * */

	private String fileName;

	/**

	 * DWG version of the file (AC1013, AC1018, etc.)

	 * */

	private String dwgVersion;

	/**

	 * Offsets to the DWG sections

	 */

	private ArrayList dwgSectionOffsets;

	/**

	 * Header vars readed from the HEADER section of the DWG file

	 * */

	private Map headerVars;

	/**

	 * This list contains what in OpenDWG specification is called

	 * the object map ( a collection of entries where each entry contains

	 * the seek of each object, and its size)

	 * */

	private ArrayList dwgObjectOffsets;

	/**

	 * For each entry in dwgObjectOffsets, we have an instance of

	 * DwgObject in the dwgObjects collection

	 *

	 * */

	private List dwgObjects;

	private HashMap handle_objects;

	private ArrayList dwgClasses;

	/**

	 * hash map that indexes all DwgLayer objects

	 * by its handle property

	 * */

	private HashMap layerTable;

	/**

	 * Specific reader of the DWG file version (12, 13, 14, 2000, etc., each

	 * version will have an specific reader)

	 * */

	private IDwgFileReader dwgReader;

	private boolean dwg3DFile = false;

	/**

	 * Memory mapped byte buffer of the whole DWG file

	 * */

	private ByteBuffer bb;

	/*

	 * Optimizaciones para evitar leer el fichero completo en cada

	 * pasada.

	 * */

	/**

	 * Contains all IDwgPolyline implementations

	 * */

	private List dwgPolylines;

	/**

	 * Contains all INSERT entities of the dwg file

	 * (these entities must be processed in a second pass)

	 *

	 * */

	private List insertList;

	private List blockList;

	/**

	 * Constructor.

	 * @param fileName an absolute path to the DWG file

	 */

	public DwgFile(String fileName) {

		this.fileName = fileName;

		dwgSectionOffsets = new ArrayList();

		dwgObjectOffsets = new ArrayList();

		headerVars = new HashMap();

		dwgClasses = new ArrayList();

		dwgObjects = new ArrayList();

		handle_objects = new HashMap();

		layerTable = new HashMap();

		dwgPolylines = new ArrayList();

		insertList = new ArrayList();

		blockList = new ArrayList();

	}

	public String getDwgVersion() {

		return dwgVersion;

	}

	/**

	 * Reads a DWG file and put its objects in the dwgObjects Vector

	 * This method is version independent

	 *

	 * @throws IOException If the file location is wrong

	 */

	public void read() throws IOException,

				DwgVersionNotSupportedException

	{

		setDwgVersion();

		if (dwgVersion.equalsIgnoreCase("Autocad R2000, R2000i, R2002")) {

			dwgReader = new DwgFileV15Reader();

		}else if (dwgVersion.equalsIgnoreCase("Autocad pre-R14")||

				dwgVersion.equalsIgnoreCase("Autocad R14") ||

				dwgVersion.equalsIgnoreCase("Autocad R13")) {

			dwgReader = new DwgFileV14Reader();

		}else if (dwgVersion.equalsIgnoreCase("Autocad R2004, R2005, R2006")){

			dwgReader = new DwgFileVR2004Reader();

		} else if (dwgVersion.equalsIgnoreCase("Autocad R12")||

				dwgVersion.equalsIgnoreCase("Autocad pre-R13 a") ||

				dwgVersion.equalsIgnoreCase("Autocad pre-R13 b")) {

			boolean isR13 = true;

			if(dwgVersion.equalsIgnoreCase("Autocad R12"))

					isR13 = false;

			dwgReader = new DwgFileV12Reader(isR13);

		}else {

			DwgVersionNotSupportedException exception =

				new DwgVersionNotSupportedException("Version de DWG no soportada");

			exception.setDwgVersion(dwgVersion);

			throw exception;

		}

		try{

		dwgReader.read(this, bb);

		}catch(Throwable t){

			t.printStackTrace();

			throw new IOException("Error leyendo dwg");

		}

	}

	private void setDwgVersion() throws IOException {

		File file = new File(fileName);

		FileInputStream fileInputStream = new FileInputStream(file);

		FileChannel fileChannel = fileInputStream.getChannel();

		long channelSize = fileChannel.size();

		bb = fileChannel.map(FileChannel.MapMode.READ_ONLY, 0, channelSize);

		byte[] versionBytes = {bb.get(0),

								bb.get(1),

								bb.get(2),

								bb.get(3),

								bb.get(4),

								bb.get(5)};

		ByteBuffer versionByteBuffer = ByteBuffer.wrap(versionBytes);

		String[] bs = new String[versionByteBuffer.capacity()];

		String versionString = "";

		for (int i=0; i<versionByteBuffer.capacity(); i++) {

			bs[i] = new String(new byte[]{(byte)(versionByteBuffer.get(i))});

			versionString = versionString + bs[i];

		}

		String version = (String) acadVersions.get(versionString);

		if(version == null)

			version = "Unknown Dwg format";

		this.dwgVersion = version;

	}

	public void setHeader(String key, Object value){

		headerVars.put(key, value);

	}

	public Object getHeader(String key){

		return headerVars.get(key);

	}

	/*

	 * A DwgLayer is a DWG drawing entity, so all DwgLayer objects are

	 * saved in dwgObjects collection.

	 * Instead of iterate over the full collection, is faster check every object

	 * and save all the DwgLayer instances in their own collection.

	 *

	 */

	protected void addDwgLayer(DwgLayer dwgLayer){

		layerTable.put(new Integer(dwgLayer.getHandle().getOffset()),

				dwgLayer);

	}

	private void printInfoOfAObject (DwgObject entity){

		logger.info("index = "+entity.getIndex() + " entity.type = " + entity.type + " entityClassName = "+ entity.getClass().getName());

		logger.info("handleCode = "+entity.getHandle().getCode());

		logger.info("entityLayerHandle = "+entity.getHandle().getOffset());

		if(entity.hasLayerHandle()){

			logger.info("layerHandleCode = "+entity.getLayerHandle().getCode());

			logger.info("layerHandle = "+entity.getLayerHandle().getOffset());

		}

		if(entity.hasSubEntityHandle()){

			logger.info("subEntityHandleCode = "+entity.getSubEntityHandle().getCode());

			logger.info("subEntityHandle = "+entity.getSubEntityHandle().getOffset());

		}

		if(entity.hasNextHandle()){

			logger.info("nextHandleCode = "+entity.getNextHandle().getCode());

			logger.info("nextHandle = "+entity.getNextHandle().getOffset());

		}

		if(entity.hasPreviousHandle()){

			logger.info ("previousHandleCode = "+entity.getPreviousHandle().getCode());

			logger.info ("previousHandle = "+entity.getPreviousHandle().getOffset());

		}

		if(entity.hasXDicObjHandle()){

			logger.info ("xDicObjHandleCode = "+entity.getXDicObjHandle());

			logger.info ("xDicObjHandle = "+entity.getXDicObjHandle());

		}

		if(entity.hasReactorsHandles()){

			ArrayList reactorsHandles = entity.getReactorsHandles();

			int size = reactorsHandles.size();

			logger.info ("NUMERO DE reactors = "+size);

			DwgHandleReference hr;

			for(int i=0; i<size; i++){

				hr=(DwgHandleReference)reactorsHandles.get(i);

				logger.info ("reactorHandleCode = "+hr.getCode());

				logger.info (" reactorHandle = "+hr.getOffset());

			}

		}

	}

	public DwgLayer getDwgLayer(DwgObject entity){

		DwgHandleReference handle = entity.getLayerHandle();

		if(handle == null){

			return null;

		}

		int	handleCode = handle.getCode();

		int	entityLayerHandle = entity.getLayerHandle().getOffset();

		int layerHandle = -1;

		int entityRecord;

		DwgObject object;

		/*

		 * OpenDWG spec, v3, page 11. HANDLE REFERENCES

		 *

		 * A handle is formed by this fields:

		 * a) CODE (4 bits)

		 * b) COUNTER (4 bits)

		 * c) OFFSET of the object (handle itself).

		 *

		 * CODE could take these values:

		 * 1) 0x2, 0x3, 0x4, 0x5 -> offset is the handle of the layer

		 * 2) 0x6 -> offset is the next object handle

		 * 3) 0x8 -> offset is the previous object handle

		 * 4) 0xA -> result is reference handle plus offset

 		 * 5) 0xC -> result is reference handle minus offset

		 *

		 * */

		// FIXME: Esto no esta terminado. Falta considerar los codigo

		// 0x2, 0x3, 0x6, 0xA que no han aparecido en los archivos de prueba.

		switch(handleCode){

		case 0x4:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO: No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getLayerHandle().getOffset();

			}

			break;

		case 0x5:

			layerHandle = entity.getLayerHandle().getOffset();

			break;

		case 0x8:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getHandle().getOffset() - 1;

			}

			break;

		case 0xC:

			if (entity.hasNextHandle()){

				int nextHandleCode = entity.getNextHandle().getCode();

				if (nextHandleCode == 0x5) {

					layerHandle = entity.getNextHandle().getOffset();

				} else {

					//TODO: No se han previsto nextHandleCode != 0x5

//					System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+

//							" con nextHandleCode "+ nextHandleCode +" no implementado.");

				}

			} else {

				layerHandle = entity.getHandle().getOffset() - entity.getLayerHandle().getOffset() + 1;

			}

			break;

		default:

//			System.out.println ("DwgFile.getDwgLayer: handleCode "+handleCode+" no implementado. entityLayerHandle="+entityLayerHandle);

		}

		if(layerHandle != -1){

			Iterator lyrIterator = layerTable.values().iterator();

			while(lyrIterator.hasNext()){

				DwgLayer lyr = (DwgLayer) lyrIterator.next();

				int lyrHdl = lyr.getHandle().getOffset();

				if (lyrHdl == layerHandle){

					return lyr;

				}

			}

		}

//		System.out.println("NO SE HA ENCONTRADO UNA CAPA CON HANDLE " + layerHandle);

//		printInfoOfAObject(entity);

		return null;

	}

	public DwgObject getDwgSuperEntity(DwgObject entity) {

		if(entity.hasSubEntityHandle()){

			int handleCode = entity.subEntityHandle.getCode();

			int offset = entity.subEntityHandle.getOffset();

			int handle = -1;

			DwgObject object;

			switch(handleCode){

			// TODO: case 0x2:

			// TODO: case 0x3:

			case 0x4:

			case 0x5:

				handle = offset;

				break;

			// TODO: case 0x6:

			case 0x8:

				handle=entity.getHandle().getOffset() - 1;

				break;

			case 0xA:

				handle = entity.getHandle().getOffset() + offset;

				break;

			case 0xC:

				handle = entity.getHandle().getOffset() - offset;

				break;

			default:

				logger.warn ("DwgObject.getDwgSuperEntity: handleCode "+handleCode+" no implementado. offset = "+offset);

			}

			if(handle != -1){

				object = getDwgObjectFromHandle(handle);

				if(object != null)

					return object;

			}

		}

		return null;

	}

	public String getLayerName(DwgObject entity) {

		DwgLayer dwgLayer = getDwgLayer(entity);

		if(dwgLayer == null){

			return "";

		}else{

			return dwgLayer.getName();

		}

	}

	/**

     * Returns the color of the layer of a DWG object

	 *

     * @param entity DWG object which we want to know its layer color

	 * @return int Layer color of the DWG object in the Autocad color code

	 */

	public int getColorByLayer(DwgObject entity) {

		int colorByLayer;

		DwgLayer dwgLyr = getDwgLayer(entity);

		if(dwgLyr == null)

			colorByLayer = 0;

		else

			colorByLayer = dwgLyr.getColor();

		return colorByLayer;

	}

	/**

	 * Configure the geometry of the polylines in a DWG file from the vertex list in

	 * this DWG file. This geometry is given by an array of Points.

	 * Besides, manage closed polylines and polylines with bulges in a GIS Data model.

     * It means that the arcs of the polylines will be done through a set of points and

     * a distance between these points.

	 */

	public void calculateGisModelDwgPolylines() {

		/*

		 * In Dwg 12 format, all vertices of a polyline are between polyline entity

		 * and endsec entity. Also, polylines dont save any handle of their vertices (first and last).

		 *

		 * After Dwg 12 version, we have the opposite case: polylines have handles/pointers to their

		 * first and last vertices.

		 *

		 * If dwg file is not V12, we must look for all polyline vertices (and we must to wait until

		 * all entities are readed).

		 * If dwg file is V12, all polylines already have their vertices.

		 * */

		if(! (dwgReader instanceof DwgFileV12Reader)){

			for (int i = 0; i < dwgPolylines.size(); i++){

				DwgObject pol = (DwgObject)dwgPolylines.get(i);

				if (pol instanceof IDwgPolyline) {

					((IDwgPolyline)pol).calculateGisModel(this);

				}//if

			}//for

		}

	}

    /**

     * Configure the geometry of the polylines in a DWG file from the vertex list in

     * this DWG file. This geometry is given by an array of Points

     * Besides, manage closed polylines and polylines with bulges in a GIS Data model.

     * It means that the arcs of the polylines will be done through a curvature

     * parameter called bulge associated with the points of the polyline.

     */

	//TODO Refactorizar para que solo se aplique a las Polilineas

//	public void calculateCadModelDwgPolylines() {

//		for (int i=0;i<dwgObjects.size();i++) {

//			DwgObject pol = (DwgObject)dwgObjects.get(i);

//			if (pol instanceof DwgPolyline2D) {

//				int flags = ((DwgPolyline2D)pol).getFlags();

//				int firstHandle = ((DwgPolyline2D)pol).getFirstVertexHandle().getOffset();

//				int lastHandle = ((DwgPolyline2D)pol).getLastVertexHandle().getOffset();

//				ArrayList pts = new ArrayList();

//				ArrayList bulges = new ArrayList();

//				double[] pt = new double[3];

//				for (int j=0;j<dwgObjects.size();j++) {

//					DwgObject firstVertex = (DwgObject)dwgObjects.get(j);

//					if (firstVertex instanceof DwgVertex2D) {

//						int vertexHandle = firstVertex.getHandle().getOffset();

//						if (vertexHandle==firstHandle) {

//							int k=0;

//							while (true) {

//								DwgObject vertex = (DwgObject)dwgObjects.get(j+k);

//								int vHandle = vertex.getHandle().getOffset();

//								if (vertex instanceof DwgVertex2D) {

//									pt = ((DwgVertex2D)vertex).getPoint();

//									pts.add(new Point2D.Double(pt[0], pt[1]));

//									double bulge = ((DwgVertex2D)vertex).getBulge();

//									bulges.add(new Double(bulge));

//									k++;

//									if (vHandle==lastHandle && vertex instanceof DwgVertex2D) {

//										break;

//									}

//								} else if (vertex instanceof DwgSeqend) {

//									break;

//								}

//							}

//						}

//					}

//				}

//				if (pts.size()>0) {

//					/*Point2D[] newPts = new Point2D[pts.size()];

//					if ((flags & 0x1)==0x1) {

//						newPts = new Point2D[pts.size()+1];

//						for (int j=0;j<pts.size();j++) {

//							newPts[j] = (Point2D)pts.get(j);

//						}

//						newPts[pts.size()] = (Point2D)pts.get(0);

//						bulges.add(new Double(0));

//					} else {

//						for (int j=0;j<pts.size();j++) {

//							newPts[j] = (Point2D)pts.get(j);

//						}

//					}*/

//					double[] bs = new double[bulges.size()];

//					for (int j=0;j<bulges.size();j++) {

//						bs[j] = ((Double)bulges.get(j)).doubleValue();

//					}

//					((DwgPolyline2D)pol).setBulges(bs);

//					//Point2D[] points = GisModelCurveCalculator.calculateGisModelBulge(newPts, bs);

//					Point2D[] points = new Point2D[pts.size()];

//					for (int j=0;j<pts.size();j++) {

//					    points[j] = (Point2D)pts.get(j);

//					}

//					((DwgPolyline2D)pol).setPts(points);

//				} else {

////					System.out.println("Encontrada polil�nea sin puntos ...");

//					// TODO: No se debe mandar nunca una polil�nea sin puntos, si esto

//					// ocurre es porque existe un error que hay que corregir ...

//				}

//			} else if (pol instanceof DwgPolyline3D) {

//			} else if (pol instanceof DwgLwPolyline && ((DwgLwPolyline)pol).getVertices()!=null) {

//			}

//		}

//	}

	/*

	 * TODO Revisar los bloques que son XREF

	 * */

	public void blockManagement2(){

		Iterator it = null;

		//dwg v12 blocks already has their entities added

		//for the rest of versions, we add block entities to their owner block

		if(! (dwgReader instanceof DwgFileV12Reader)){

			//once we have read all dwg entities, we look for all of them

			//that has a superentity that is a block (to fill in the entity list

			//of each block

			it = dwgObjects.iterator();

			int i = 0;

			while(it.hasNext()){

				DwgObject entity = (DwgObject)it.next();

				DwgObject superEnt = getDwgSuperEntity(entity);

				if(superEnt instanceof DwgBlockHeader){

					DwgBlockHeader blk = (DwgBlockHeader)superEnt;

					blk.addObject(entity);

					it.remove();//TODO Creo que esto es lento, mejor

					//el metodo original (en java solo se duplican las referencias)

					i++;

				}

			}//while

		}//if dwgfilev12

		//after that, we process the INSERTs

		it = insertList.iterator();

		while(it.hasNext()){

			DwgInsert insert = (DwgInsert) it.next();

			if(insert.isProcessed()){

				//It has been processed nexted to other insert

				continue;

			}

			insert.setProcessed(true);

			double[] p = insert.getInsertionPoint();

			Point2D point = new Point2D.Double(p[0], p[1]);

			double[] scale = insert.getScale();

			double rot = insert.getRotation();

			int blockHandle = insert.getBlockHeaderHandle().getOffset();

			manageInsert2(point, scale,

					rot, blockHandle,

					dwgObjects, handle_objects);

		}

}

	public void manageInsert2(Point2D insPoint, double[] scale,

			double rot, int bHandle,

			List dwgObjectsWithoutBlocks,

			Map handleObjectsWithoutBlocks) {

		DwgObject object = (DwgObject) handle_objects.get(new Integer(bHandle));

		if(object == null){

			logger.error("No hemos encontrado el BlockHeader cuyo handle es "+bHandle);

			return;

		}else if(! (object instanceof DwgBlockHeader)){

			//Hay un problema con la asignaci�n de handle

			//Un INSERT tiene como handle de Block una entidad que no es block

			logger.error("handle incorrecto." + object.getClass().getName() + " no es un blockheader");

			return;

		}

		DwgBlockHeader blockHeader = (DwgBlockHeader)object;

		double[] bPoint = blockHeader.getBasePoint();

		String bname = blockHeader.getName();

		if (bname.startsWith("*"))

			return;

		//TODO Cambiar por List. Done.

		List entities = blockHeader.getObjects();

		if(entities.size() == 0){

			logger.warn("El bloque "+blockHeader.getName()+" no tiene ninguna entidad");

		}

		Iterator blkEntIt = entities.iterator();

		while(blkEntIt.hasNext()){

			DwgObject obj = (DwgObject) blkEntIt.next();

			 manageBlockEntity(obj, bPoint,

			 		  insPoint, scale,

			 		  rot, dwgObjectsWithoutBlocks,

			 		  handleObjectsWithoutBlocks);

		}//while

	}

	public int getIndexOf(DwgObject dwgObject){

		return dwgObjects.indexOf(dwgObject);

	}

    /**

     * Changes the location of an object extracted from a block. This location will be

     * obtained through the insertion parameters from the block and the corresponding

     * insert.

     * @param entity, the entity extracted from the block.

     * @param bPoint, offset for the coordinates of the entity.

     * @param insPoint, coordinates of the insertion point for the entity.

     * @param scale, scale for the entity.

     * @param rot, rotation angle for the entity.

     * @param id, a count as a id.

     * @param dwgObjectsWithoutBlocks, a object list with the elements extracted from

     * the blocks.

     */

	private void manageBlockEntity(DwgObject entity,

									double[] bPoint,

									Point2D insPoint,

									double[] scale,

									double rot,

									List dwgObjectsWithoutBlocks,

									Map handleObjectsWithoutBlocks) {

		if(entity instanceof IDwgBlockMember){

			IDwgBlockMember blockMember = (IDwgBlockMember)entity;

			blockMember.transform2Block(bPoint, insPoint, scale, rot,

					dwgObjectsWithoutBlocks,

					handleObjectsWithoutBlocks,this);

		}

	}

	/**

	 * Add a DWG section offset to the dwgSectionOffsets vector

	 *

	 * @param key Define the DWG section

	 * @param seek Offset of the section

	 * @param size Size of the section

	 */

	public void addDwgSectionOffset(String key, int seek, int size) {

		DwgSectionOffset dso = new DwgSectionOffset(key, seek, size);

		dwgSectionOffsets.add(dso);

	}

	/**

     * Returns the offset of DWG section given by its key

	 *

     * @param key Define the DWG section

	 * @return int Offset of the section in the DWG file

	 */

	public int getDwgSectionOffset(String key) {

		int offset = 0;

		for (int i=0; i<dwgSectionOffsets.size(); i++) {

			DwgSectionOffset dso = (DwgSectionOffset)dwgSectionOffsets.get(i);

			String ikey = dso.getKey();

			if (key.equals(ikey)) {

				offset = dso.getSeek();

				break;

			}

		}

		return offset;

	}

	/**

	 * Add a DWG object offset to the dwgObjectOffsets vector

	 *

	 * @param handle Object handle

	 * @param offset Offset of the object data in the DWG file

	 */

	public void addDwgObjectOffset(int handle, int offset) {

		DwgObjectOffset doo = new DwgObjectOffset(handle, offset);

		dwgObjectOffsets.add(doo);

	}

	/**

	 *

	 * Add a DWG object to the dwgObject vector

	 *

	 * @param dwgObject DWG object

	 */

	public void addDwgObject(DwgObject dwgObject){

		//TODO Ver si puedo inicializar las listas especificas

		//(IDwgPolyline, etc) aqu?

		dwgObjects.add(dwgObject);

		/*

		 * TODO Quitar todos estos if-then y sustituirlos por un metodo callback

		 *

		 *

		 * (dwgObject.init(this), y que cada objeto haga lo que tenga que hacer

		 * */

		if(dwgObject instanceof DwgLayer){

			this.addDwgLayer((DwgLayer) dwgObject);

		}

		//Probamos a no aplicar las extrusiones

		if(dwgObject instanceof IDwgExtrusionable){

			((IDwgExtrusionable)dwgObject).applyExtrussion();

		}

		if(dwgObject instanceof IDwgPolyline){

			dwgPolylines.add(dwgObject);

		}

		if(dwgObject instanceof IDwg3DTestable){

			if(!isDwg3DFile()){//if its true, we dont check again

				setDwg3DFile(((IDwg3DTestable)dwgObject).has3DData());

			}

		}

		if(dwgObject instanceof DwgInsert){

			insertList.add(dwgObject);

		}

		if(dwgObject instanceof DwgBlockHeader){

			blockList.add(dwgObject);

		}

		handle_objects.put(new Integer(dwgObject.getHandle().getOffset()), dwgObject);

	}

	/**

	 * Returns dwgObjects from its insertion order (position

	 * in the dwg file)

	 *

	 * @param index order in the dwg file

	 * @return position

	 * */

	public DwgObject getDwgObject(int index){

		return (DwgObject) dwgObjects.get(index);

	}

	public DwgObject getDwgObjectFromHandle(int handle){

		return (DwgObject) handle_objects.get(new Integer(handle));

	}

	/**

	 * Add a DWG class to the dwgClasses vector

	 *

	 * @param dwgClass DWG class

	 */

	public void addDwgClass(DwgClass dwgClass){

		dwgClasses.add(dwgClass);

	}

	/**

	 * Add a DWG class to the dwgClasses vector

	 *

	 * @param dwgClass DWG class

	 */

	public void addDwgClass(DwgClass2004 dwgClass){

		dwgClasses.add(dwgClass);

	}

	public void printClasses(){

		logger.info("#### CLASSES ####");

		for(int i = 0; i < dwgClasses.size(); i++){

			DwgClass clazz = (DwgClass) dwgClasses.get(i);

			logger.info(clazz.toString());

		}

		logger.info("#############");

	}

	public List getDwgClasses(){

		return dwgClasses;

	}

    /**

     * @return Returns the dwgObjectOffsets.

     */

    public ArrayList getDwgObjectOffsets() {

        return dwgObjectOffsets;

    }

    /**

     * @return Returns the dwgObjects.

     */

    public List getDwgObjects() {

        return dwgObjects;

    }

    /**

     * @return Returns the fileName.

     */

    public String getFileName() {

        return fileName;

    }

    /**

     * @return Returns the dwg3DFile.

     */

    public boolean isDwg3DFile() {

        return dwg3DFile;

    }

    /**

     * @param dwg3DFile The dwg3DFile to set.

     */

    public void setDwg3DFile(boolean dwg3DFile) {

        this.dwg3DFile = dwg3DFile;

    }

}

/* gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib��ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.dwg.lib;

import java.math.BigInteger;

/**

 * Clase que engloba m�todos para trabajar con bytes. 

 *

 * @author Vicente Caballero Navarro

 */

public class ByteUtils {

	public static final int SIZE_BOOL = 1;

	public static final int SIZE_SHORT = 2;

	public static final int SIZE_INT = 4;

	public static final int SIZE_LONG = 8;

	public static final int SIZE_DOUBLE = 8;

	/** A nibble->char mapping for printing out bytes. */

	public static final char[] digits = {

			'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',

			'e', 'f'

		};

	/**

	 * Return the <code>int</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes read.

	 *

	 * @return the value of the <code>int</code> decoded

	 */

	public static final int bytesToInt(byte[] data, int[] offset) {

		/**

		 * TODO: We use network-order within OceanStore, but temporarily

		 * supporting intel-order to work with some JNI code until JNI code is

		 * set to interoperate with network-order.

		 */

		int result = 0;

		for (int i = 0; i < SIZE_INT; ++i) {

			result <<= 8;

			result |= byteToUnsignedInt(data[offset[0]++]);

		}

		return result;

	}

	/**

	 * Write the bytes representing <code>i</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param i the <code>int</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void intToBytes(int i, byte[] data, int[] offset) {

		/**

		 * TODO: We use network-order within OceanStore, but temporarily

		 * supporting intel-order to work with some JNI code until JNI code is

		 * set to interoperate with network-order.

		 */

		if (data != null) {

			for (int j = (offset[0] + SIZE_INT) - 1; j >= offset[0]; --j) {

				data[j] = (byte) i;

				i >>= 8;

			}

		}

		offset[0] += SIZE_INT;

	}

	/**

	 * Return the <code>short</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes read.

	 *

	 * @return the value of the <code>short</code> decoded

	 */

	public static final short bytesToShort(byte[] data, int[] offset) {

		/**

		 * TODO: We use network-order within OceanStore, but temporarily

		 * supporting intel-order to work with some JNI code until JNI code is

		 * set to interoperate with network-order.

		 */

		short result = 0;

		for (int i = 0; i < SIZE_SHORT; ++i) {

			result <<= 8;

			result |= (short) byteToUnsignedInt(data[offset[0]++]);

		}

		return result;

	}

	/**

	 * Write the bytes representing <code>s</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param s the <code>short</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void shortToBytes(short s, byte[] data, int[] offset) {

		/**

		 * TODO: We use network-order within OceanStore, but temporarily

		 * supporting intel-order to work with some JNI code until JNI code is

		 * set to interoperate with network-order.

		 */

		if (data != null) {

			data[offset[0] + 1] = (byte) s;

			data[offset[0]] = (byte) (s >> 8);

		}

		offset[0] += SIZE_SHORT;

	}

	/**

	 * Return the <code>long</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on  function entry, and which

	 * 		  on function exit has been incremented by the number of bytes

	 * 		  read.

	 *

	 * @return the value of the <code>long</code> decoded

	 */

	public static final long bytesToLong(byte[] data, int[] offset) {

		long result = 0;

		for (int i = 0; i < SIZE_LONG; ++i) {

			result <<= 8;

			int res = byteToUnsignedInt(data[offset[0]++]);

			result = result | res;

		}

		return result;

	}

	/**

	 * Write the bytes representing <code>l</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param l the <code>long</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void longToBytes(long l, byte[] data, int[] offset) {

		/**

		 * TODO: We use network-order within OceanStore, but temporarily

		 * supporting intel-order to work with some JNI code until JNI code is

		 * set to interoperate with network-order.

		 */

		if (data != null) {

			for (int j = (offset[0] + SIZE_LONG) - 1; j >= offset[0]; --j) {

				data[j] = (byte) l;

				l >>= 8;

			}

		}

		offset[0] += SIZE_LONG;

	}

	/**

	 * Return the <code>double</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on  function entry, and which

	 * 		  on function exit has been incremented by the number of bytes

	 * 		  read.

	 *

	 * @return the value of the <code>double</code> decoded

	 */

	public static final double bytesToDouble(byte[] data, int[] offset) {

		long bits = bytesToLong(data, offset);

		return Double.longBitsToDouble(bits);

	}

	/**

	 * Write the bytes representing <code>d</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param d the <code>double</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void doubleToBytes(double d, byte[] data, int[] offset) {

		long bits = Double.doubleToLongBits(d);

		longToBytes(bits, data, offset);

	}

	/**

	 * Return the <code>String</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>. This method

	 * relies on the user using the corresponding <code>stringToBytes</code>

	 * method to encode the <code>String</code>, so that it may properly

	 * retrieve the <code>String</code> length.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes read.

	 *

	 * @return the value of the <code>String</code> decoded

	 */

	public static final String bytesToString(byte[] data, int[] offset) {

		offset[0] = 0;

		int length = bytesToInt(data, offset);

		String st = null;

		if ((length < 0) || (length > data.length)) {

			st = new String(data);

		} else {

			st = new String(data, offset[0], length);

		}

		offset[0] += length;

		return st;

	}

	/**

	 * Write the bytes representing <code>s</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param s the <code>String</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void stringToBytes(String s, byte[] data, int[] offset) {

		byte[] s_bytes = s.getBytes();

		if (data != null) {

			intToBytes(s_bytes.length, data, offset);

			memcpy(data, offset[0], s_bytes, 0, s_bytes.length);

		} else {

			offset[0] += SIZE_INT;

		}

		offset[0] += s_bytes.length;

	}

	/**

	 * Return the <code>boolean</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on  function entry, and which

	 * 		  on function exit has been incremented by the number of bytes

	 * 		  read.

	 *

	 * @return the value of the <code>boolean</code> decoded

	 */

	public static final boolean bytesToBool(byte[] data, int[] offset) {

		boolean result = true;

		if (data[offset[0]] == 0) {

			result = false;

		}

		offset[0] += SIZE_BOOL;

		return result;

	}

	/**

	 * Write the bytes representing <code>b</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param b the <code>boolean</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void boolToBytes(boolean b, byte[] data, int[] offset) {

		if (data != null) {

			data[offset[0]] = (byte) (b ? 1 : 0);

		}

		offset[0] += SIZE_BOOL;

	}

	/**

	 * Return the <code>BigInteger</code> represented by the bytes in

	 * <code>data</code> staring at offset <code>offset[0]</code>.

	 *

	 * @param data the array from which to read

	 * @param offset A single element array whose first element is the index in

	 * 		  data from which to begin reading on  function entry, and which

	 * 		  on function exit has been incremented by the number of bytes

	 * 		  read.

	 *

	 * @return the <code>BigInteger</code> decoded

	 */

	public static final BigInteger bytesToBigInteger(byte[] data, int[] offset) {

		int length = bytesToInt(data, offset);

		byte[] bytes = new byte[length];

		offset[0] += memcpy(bytes, 0, data, offset[0], length);

		return new BigInteger(bytes);

	}

	/**

	 * Write the bytes representing <code>n</code> into the byte array

	 * <code>data</code>, starting at index <code>offset [0]</code>, and

	 * increment <code>offset [0]</code> by the number of bytes written; if

	 * <code>data == null</code>, increment <code>offset [0]</code> by the

	 * number of bytes that would have been written otherwise.

	 *

	 * @param n the <code>BigInteger</code> to encode

	 * @param data The byte array to store into, or <code>null</code>.

	 * @param offset A single element array whose first element is the index in

	 * 		  data to begin writing at on function entry, and which on

	 * 		  function exit has been incremented by the number of bytes

	 * 		  written.

	 */

	public static final void bigIntegerToBytes(BigInteger n, byte[] data,

		int[] offset) {

		byte[] bytes = n.toByteArray();

		intToBytes(bytes.length, data, offset);

		offset[0] += memcpy(data, offset[0], bytes, 0, bytes.length);

	}

	/**

	 * Convert an array of <code>bytes</code>s into an array of

	 * <code>ints</code>.

	 *

	 * @param dst the array to write

	 * @param dst_offset the start offset in <code>dst</code>, times 4. This

	 * 		  measures the offset as if <code>dst</code> were an array of

	 * 		  <code>byte</code>s (rather than <code>int</code>s).

	 * @param src the array to read

	 * @param src_offset the start offset in <code>src</code>

	 * @param length the number of <code>byte</code>s to copy.

	 */

	public static final void bytesToInts(int[] dst, int dst_offset, byte[] src,

		int src_offset, int length) {

		if ((src == null) || (dst == null) ||

				((src_offset + length) > src.length) ||

				((dst_offset + length) > (dst.length * 4)) ||

				((dst_offset % 4) != 0) || ((length % 4) != 0)) {

			croak("bytesToInts parameters are invalid" + " src==" + src +

				" dst==" + dst +

				(((src == null) || (dst == null)) ? " "

												  : (" (src_offset+length)>src.length==" +

				(src_offset + length) + ">" + src.length +

				" (dst_offset+length)>(dst.length*4)==" +

				(dst_offset + length) + ">" + (dst.length * 4) +

				" (dst_offset%4)==" + (dst_offset % 4) + " (length%4)==" +

				(length % 4) + " dest.length==" + dst.length + " length==" +

				length)));

		}

		// Convert parameters to normal format

		int[] offset = new int[1];

		offset[0] = src_offset;

		int int_dst_offset = dst_offset / 4;

		for (int i = 0; i < (length / 4); ++i) {

			dst[int_dst_offset++] = bytesToInt(src, offset);

		}

	}

	/**

	 * Convert an array of <code>int</code>s into an array of

	 * <code>bytes</code>.

	 *

	 * @param dst the array to write

	 * @param dst_offset the start offset in <code>dst</code>

	 * @param src the array to read

	 * @param src_offset the start offset in <code>src</code>, times 4. This

	 * 		  measures the offset as if <code>src</code> were an array of

	 * 		  <code>byte</code>s (rather than <code>int</code>s).

	 * @param length the number of <code>byte</code>s to copy.

	 */

	public static final void intsToBytes(byte[] dst, int dst_offset, int[] src,

		int src_offset, int length) {

		if ((src == null) || (dst == null) ||

				((dst_offset + length) > dst.length) ||

				((src_offset + length) > (src.length * 4)) ||

				((src_offset % 4) != 0) || ((length % 4) != 0)) {

			croak("intsToBytes parameters are invalid:" + " src=" + src +

				" dst=" + dst + " (dst_offset=" + dst_offset + " + length=" +

				length + ")=" + (dst_offset + length) + " > dst.length=" +

				((dst == null) ? 0 : dst.length) + " (src_offset=" +

				src_offset + " + length=" + length + ")=" +

				(src_offset + length) + " > (src.length=" +

				((src == null) ? 0 : src.length) + "*4)=" +

				((src == null) ? 0 : (src.length * 4)) + " (src_offset=" +

				src_offset + " % 4)=" + (src_offset % 4) + " != 0" +

				" (length=" + length + " % 4)=" + (length % 4) + " != 0");

		}

		// Convert parameters to normal format

		int[] offset = new int[1];

		offset[0] = dst_offset;

		int int_src_offset = src_offset / 4;

		for (int i = 0; i < (length / 4); ++i) {

			intToBytes(src[int_src_offset++], dst, offset);

		}

	}

	/**

	 * Convert a <code>byte</code> into an unsigned integer.

	 *

	 * @param b the <code>byte</code> to cast

	 *

	 * @return a postiive <code>int</code> whose lowest byte contains the bits

	 * 		   of <code>b</code>.

	 */

	public static final int byteToUnsignedInt(byte b) {

		return ((int) b) & 0xff;

	}

	/**

	 * Copy contents of one array of <code>bytes</code> into another. If either

	 * array is <code>null</code>, simply return the <code>length</code>

	 * parameter directly.

	 *

	 * @param dst the array to write, or <code>null</code>

	 * @param dst_offset the start offset in <code>dst</code>

	 * @param src the array to read, or <code>null</code>

	 * @param src_offset the start offset in <code>src</code>