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141 lines
4.7 KiB
Java
141 lines
4.7 KiB
Java
/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2002 by Robert Greene
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* robgreene at users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.webcodepro.applecommander.storage.os.dos33;
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import com.webcodepro.applecommander.storage.StorageBundle;
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import com.webcodepro.applecommander.storage.physical.ImageOrder;
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import com.webcodepro.applecommander.util.TextBundle;
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/**
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* Manages a disk that is in OzDOS format.
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* This is basically DOS 3.3 except that the disk has two volumes of
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* each 400K. Logical disk one takes the first part of the block
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* (bytes $000-$0FF) while the second logical disk takes the second
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* part of a block (bytes $100-$1FF).
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* <br>
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* Created on Dec 16, 2002.
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* @author Rob Greene
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*/
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public class OzDosFormatDisk extends DosFormatDisk {
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private TextBundle textBundle = StorageBundle.getInstance();
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/**
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* Use this indicator to work with logical disk #1.
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* It is essentially the offset into the block.
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*/
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public static final int OZDOS_DISK_1 = 0x0;
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/**
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* Use this indicator to work with logical disk #2.
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* It is essentially the offset into the block.
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*/
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public static final int OZDOS_DISK_2 = 0x100;
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/**
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* Indicates which logical disk to work with (by offset
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* into the block).
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*/
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private int logicalOffset;
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/**
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* Constructor for OzDosFormatDisk.
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*/
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public OzDosFormatDisk(String filename, ImageOrder imageOrder, int logicalOffset) {
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super(filename, imageOrder);
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this.logicalOffset = logicalOffset;
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}
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/**
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* Create a OzDosFormatDisk.
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*/
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public static DosFormatDisk[] create(String filename, ImageOrder imageOrder) {
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OzDosFormatDisk disk1 = new OzDosFormatDisk(filename, imageOrder, OZDOS_DISK_1);
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OzDosFormatDisk disk2 = new OzDosFormatDisk(filename, imageOrder, OZDOS_DISK_2);
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disk1.format();
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disk2.format();
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return new OzDosFormatDisk[] { disk1, disk2 };
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}
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/**
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* Answer with the name of this disk.
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* @see com.webcodepro.applecommander.storage.FormattedDisk#getDiskName()
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*/
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public String getDiskName() {
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if (logicalOffset == OZDOS_DISK_1) {
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return textBundle.format("DiskNameN", super.getDiskName(), 1); //$NON-NLS-1$
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} else if (logicalOffset == OZDOS_DISK_2) {
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return textBundle.format("DiskNameN", super.getDiskName(), 2); //$NON-NLS-1$
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} else {
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return super.getDiskName();
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}
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}
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/**
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* Returns the logical disk number. This can be used to identify
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* between disks when a format supports multiple logical volumes.
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*/
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public int getLogicalDiskNumber() {
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if (logicalOffset == OZDOS_DISK_1) {
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return 1;
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} else if (logicalOffset == OZDOS_DISK_2) {
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return 2;
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} else {
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return 0;
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}
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}
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/**
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* Format the disk as OzDOS.
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* @see com.webcodepro.applecommander.storage.FormattedDisk#format()
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*/
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public void format() {
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final int tracksPerDisk = 50;
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final int sectorsPerTrack = 32;
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final int firstCatalogSector = 31;
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// We can't use the ImageLayout to format this disk since that actually wipes the entire
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// 800K volume (that is, both disk1 and disk2 get cleared).
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byte[] data = new byte[SECTOR_SIZE];
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for (int t = 0; t < tracksPerDisk; t++) {
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for (int s = 0; s < sectorsPerTrack; s++) {
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writeSector(t, s, data);
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}
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}
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// Lay down the catalog track...
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format(firstCatalogSector, tracksPerDisk, sectorsPerTrack);
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}
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/**
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* Retrieve the specified sector.
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*/
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public byte[] readSector(int track, int sector) throws IllegalArgumentException {
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byte[] blockData = readBlock(getBlockNumber(track,sector));
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byte[] sectorData = new byte[SECTOR_SIZE];
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System.arraycopy(blockData, logicalOffset, sectorData, 0, SECTOR_SIZE);
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return sectorData;
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}
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/**
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* Write the specified sector.
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*/
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public void writeSector(int track, int sector, byte[] bytes)
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throws IllegalArgumentException {
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int blockNumber = getBlockNumber(track,sector);
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byte[] blockData = readBlock(blockNumber);
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System.arraycopy(bytes, 0, blockData, logicalOffset, SECTOR_SIZE);
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getImageOrder().writeBlock(blockNumber, blockData);
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}
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/**
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* Compute the block number.
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*/
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protected int getBlockNumber(int track, int sector) {
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return (track * 32) + sector;
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}
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}
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