Subversion Repositories mkgmap

/*
 * Copyright (C) 2009.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * 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.
 */
package uk.me.parabola.imgfmt.app.mdr;

import java.nio.ByteBuffer;

import uk.me.parabola.imgfmt.app.BufferedImgFileWriter;
import uk.me.parabola.imgfmt.app.ImgFileWriter;

/**
 * Each map has one of these and it is used to provide a list of records
 * in the various sections that actually belong to this map.
 *
 * @author Steve Ratcliffe
 */
public class Mdr1MapIndex {
        private final Mdr1SubHeader subHeader = new Mdr1SubHeader();
        private final BufferedImgFileWriter subWriter = new BufferedImgFileWriter(null);

        private int pointerSize;

        public Mdr1MapIndex() {
                // skip over where the header will be
                this.subWriter.position(subHeader.getHeaderLen());
        }

        public void startSection(int n) {
        }

        public void endSection(int n) {
                int sn = sectionToSubsection(n);
                if (sn != 0)
                        subHeader.setEndSubsection(sn, subWriter.position());
        }

        public void addPointer(int recordNumber) {
                switch (pointerSize) {
                case 4:
                        subWriter.putInt(recordNumber);
                        break;
                case 3:
                        subWriter.put3(recordNumber);
                        break;
                case 2:
                        subWriter.putChar((char) recordNumber);
                        break;
                case 1:
                        subWriter.put((byte) recordNumber);
                        break;
                default:
                        assert false;
                }
        }
       
        private int sectionToSubsection(int n) {
                int sn;
                switch (n) {
                case 11: sn = 1; break;
                case 10: sn = 2; break;
                case 7:  sn = 3; break;
                case 5:  sn = 4; break;
                case 6:  sn = 5; break;
                case 20:  sn = 6; break;
                case 21:  sn = 7; break;
                case 22:  sn = 8; break;
                default: sn = 0; break;
                }
                return sn;
        }

        public void writeSubSection(ImgFileWriter writer) {
                subHeader.writeFileHeader(writer);

                ByteBuffer buffer = subWriter.getBuffer();
                byte[] bytes = buffer.array();
                int hl = (int) subHeader.getHeaderLen();
                writer.put(bytes, hl, buffer.position() - hl);
        }

        public void setPointerSize(int sectionNumber, int pointerSize) {
                this.pointerSize = pointerSize;
                int sn = sectionToSubsection(sectionNumber);
                if (sn != 0)
                        subHeader.setItemSize(sn, pointerSize);
        }
}