100 lines
3.0 KiB
Java
100 lines
3.0 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;
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/**
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* Manages a disk that is in UniDOS 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.
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* <br>
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* Created on Dec 13, 2002.
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* @author Rob
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*/
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public class UniDosFormatDisk extends DosFormatDisk {
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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 disk image.
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*/
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public static final int UNIDOS_DISK_1 = 0;
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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 disk image.
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*/
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public static final int UNIDOS_DISK_2 = 409600;
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/**
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* Indicates which logical disk to work with (by offset
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* into the disk image itself).
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*/
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private int logicalOffset;
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/**
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* Constructor for UniDosFormatDisk.
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* @param filename
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* @param diskImage
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*/
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public UniDosFormatDisk(String filename, byte[] diskImage, int logicalOffset) {
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super(filename, diskImage);
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this.logicalOffset = logicalOffset;
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}
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/**
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* Constructor for UniDosFormatDisk.
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* @param filename
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*/
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public UniDosFormatDisk(String filename, int logicalOffset) {
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super(filename);
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this.logicalOffset = logicalOffset;
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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 == UNIDOS_DISK_1) {
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return super.getDiskName() + " (Disk 1)";
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} else if (logicalOffset == UNIDOS_DISK_2) {
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return super.getDiskName() + " (Disk 2)";
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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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* Modify the disk offset by the logical disk offset. This allows
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* simple support for two DOS volumes on a UniDOS disk.
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* @see com.webcodepro.applecommander.storage.Disk#getOffset(int, int)
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*/
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protected int getOffset(int track, int sector) throws IllegalArgumentException {
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return super.getOffset(track, sector) + logicalOffset;
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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 == UNIDOS_DISK_1) {
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return 1;
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} else if (logicalOffset == UNIDOS_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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