Application: gvSIG desktop

/* DielmoOpenLiDAR

 *

 * Copyright (C) 2008 DIELMO 3D S.L. (DIELMO) and Infrastructures  

 * and Transports Department of the Valencian Government (CIT)

 * 

 * 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., 51 Franklin Street, Fifth Floor, Boston, 

 * MA  02110-1301, USA.

 *

 * For more information, contact:

 *

 * DIELMO 3D S.L.

 * Plaza Vicente Andr?s Estell?s 1 Bajo E

 * 46950 Xirivella, Valencia

 * SPAIN

 *   

 * +34 963137212

 * dielmo@dielmo.com

 * www.dielmo.com

 * 

 * or

 * 

 * Generalitat Valenciana

 * Conselleria d'Infraestructures i Transport

 * Av. Blasco Ib??ez, 50

 * 46010 VALENCIA

 * SPAIN

 *

 * +34 963862235

 * gvsig@gva.es

 * www.gvsig.gva.es

 */

/*

 * AUTHORS (In addition to DIELMO and CIT):

 *  

 */

package com.dielmo.lidar;

import java.io.*;

import java.nio.ByteBuffer;

import javax.swing.JOptionPane;

public class LASVariableLengthRecord_V10 extends LASVariableLengthRecord_1X {        

        /**

         * file Signature, must contain AABB (43707 in decimal) in version LAS1.0, while in version LAS1.1

         * it is a reserved field.

         */

        private int recordSignature;

        /**

         * Default constructor, without arguments.

         * Initializes all components to zero.

         */ 

        public LASVariableLengthRecord_V10() {

                super();

                recordSignature = 43707; // 43707 decimal = AABB hexadecimal

        }

        /**

         * Return record signature. This must be always "AABB" (43707 in decimal) in version LAS1.0

         * 

         * @return record signature

         */

        public int getRecordSignature() {        

                return recordSignature;

        }

        /**

         * set record signature. This must be always "AABB" in version LAS1.0 (43707 in decimal)

         * 

         * @param r new record signature

         */

        public void setRecordSignature() {        

                recordSignature = 43707;

        }

        /**

         * Read the variable length record data

         * 

         * @param input input file to read

         * @param VarLengthRecord buffer into which the data is read 

         * @return true if success else return false 

         */

        protected boolean readVarLegthRecordData(InputStream input) {

                if(RecordLengthAfterHeader <= 0) {

                        return false;

                }

                try {

                        data = new byte[RecordLengthAfterHeader];

                        int offset=0,numRead=0;

                        while (offset < RecordLengthAfterHeader && (numRead = input.read(data, offset, RecordLengthAfterHeader-offset) ) >= 0) {

                             offset += numRead;

                        }

                    if (offset < RecordLengthAfterHeader) {

                            JOptionPane.showMessageDialog(null, "Bad input format");

                            return false;

                        }

                } catch(IOException e) {

                        e.printStackTrace();

                        return false;

                }

                return true;                        

        }

        /**

         * Read the Variable length record header of LAS file

         * 

         * @param input input file to read

         * @return true if success else return false 

         */

        public boolean readVarLegthRecord(InputStream input) {

                int offset=0,numRead=0, j; 

                byte[] VarLengthRecord = new byte[54];

                //read VarLenhRecord

              try {

                        while (offset < 54 && (numRead = input.read(VarLengthRecord, offset, VarLengthRecord.length-offset) ) >= 0) {

                             offset += numRead;

                        }

                    if (offset < VarLengthRecord.length) {

                            JOptionPane.showMessageDialog(null, "Bad input format");

                            return false;

                        }

                    recordSignature = ByteUtilities.arr2Unsignedshort(VarLengthRecord, 0);

                    if(recordSignature != 43707) {

                            return false;

                    }

                    for(j=0;j<16;j++)

                                userID[j] = (char)(VarLengthRecord[j+2] & 0xFF);

                        recordID = ByteUtilities.arr2Unsignedshort(VarLengthRecord, 18);

                        RecordLengthAfterHeader = ByteUtilities.arr2Unsignedshort(VarLengthRecord, 20);

                        for(j=0;j<32;j++)

                                description[j] = (char)(VarLengthRecord[j+22] & 0xFF);

                        readVarLegthRecordData(input);

                } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                        return false;

                }

                return true;

        }

        public boolean writeVarLegthRecord(ByteBuffer bb) {

                int i;

                int index=0;

                byte[] VL_Buffer = new byte[54];

            if(recordSignature != 43707) {

                        return false;

                }

            // recordSignature bytes 0-2

            ByteUtilities.unsignedShort2Arr(getRecordSignature(), VL_Buffer, 0);

                // userID bytes 2-18

                i = 0;

                for(index=2;index<18;index++) {

                        VL_Buffer[index] = ((byte)(userID[i] & 0XFF));

                        i++;

                }

                // recordID bytes 18-20

                ByteUtilities.unsignedShort2Arr(getRecordID(), VL_Buffer, 18);

                // RecordLengthAfterHeader bytes 20-22

                ByteUtilities.unsignedShort2Arr(getRecordLengthAfterHeader(), VL_Buffer, 20);

                // description bytes 22-54

                i = 0;

                for(index=22;index<54;index++) {

                        VL_Buffer[index] = ((byte)(description[i] & 0XFF));

                        i++;

                }

                // write header VLR

                bb.put(VL_Buffer);

                // write data VLR

                bb.put(getData());

                return true;

        }

}