Subversion Repositories mkgmap

/*
 * Copyright (C) 2008 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 23-Jun-2008
 */
package uk.me.parabola.tdbfmt;

import java.io.IOException;

import uk.me.parabola.io.FileBlock;
import uk.me.parabola.io.StructuredOutputStream;

/**
 * @author Steve Ratcliffe
 */
public class TBlock extends FileBlock {
        private static final int BLOCK_ID = 'T';

        private long sum;

        public TBlock() {
                super(BLOCK_ID);
        }

        /**
         * This is to overridden in a subclass.
         */
        protected void writeBody(StructuredOutputStream os) throws IOException {
                // If you change A,B,C or D the maps
                // will not load, you can change the rest without easily visible
                // problems although I suppose they must do something.
                //
                // A,B,C,D is a standard crc32 sum of the rest of the file.
                // (Andrzej Popowsk)
                os.write2(0);
                os.write((int) (sum >> 24)); // A
                os.write3(0);
                os.write3(0);
                os.write((int) (sum >> 16)); // B
                os.write2(0);
                os.write((int) (sum >> 8)); // C
                os.write4(0);
                os.write((int) sum); // D
                os.write2(0);
        }

        public void setSum(long sum) {
                this.sum = sum;
        }
}