Another format that puts DOS onto an 800K device.

src/com/webcodepro/applecommander/storage/OzDosFormatDisk.java

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+/*
+ * AppleCommander - An Apple ][ image utility.
+ * Copyright (C) 2002 by Robert Greene
+ * robgreene at users.sourceforge.net
+ *
+ * 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., 
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package com.webcodepro.applecommander.storage;
+
+/**
+ * Manages a disk that is in OzDOS format.
+ * This is basically DOS 3.3 except that the disk has two volumes of
+ * each 400K.  Logical disk one takes the first part of the block
+ * (bytes $000-$0FF) while the second logical disk takes the second
+ * part of a block (bytes $100-$1FF).
+ * <br>
+ * Created on Dec 16, 2002.
+ * @author Rob Greene
+ */
+public class OzDosFormatDisk extends DosFormatDisk {
+	/**
+	 * Use this indicator to work with logical disk #1.
+	 * It is essentially the offset into the block.
+	 */
+	public static final int OZDOS_DISK_1 = 0x0;
+	/**
+	 * Use this indicator to work with logical disk #2.
+	 * It is essentially the offset into the block.
+	 */
+	public static final int OZDOS_DISK_2 = 0x100;
+	/**
+	 * Indicates which logical disk to work with (by offset
+	 * into the block).
+	 */
+	private int logicalOffset;
+	/**
+	 * Constructor for OzDosFormatDisk.
+	 * @param filename
+	 * @param diskImage
+	 */
+	public OzDosFormatDisk(String filename, byte[] diskImage, int logicalOffset) {
+		super(filename, diskImage);
+		this.logicalOffset = logicalOffset;
+	}
+	/**
+	 * Create a OzDosFormatDisk.
+	 */
+	public static DosFormatDisk[] create(String filename) {
+		byte[] diskImage = new byte[APPLE_800KB_2IMG_DISK];
+		OzDosFormatDisk disk1 = new OzDosFormatDisk(filename,
+			diskImage, OZDOS_DISK_1);
+		disk1.format();
+		OzDosFormatDisk disk2 = new OzDosFormatDisk(filename,
+			diskImage, OZDOS_DISK_2);
+		disk2.format();
+		return new OzDosFormatDisk[] { disk1, disk2 };
+	}
+	/**
+	 * Answer with the name of this disk.
+	 * @see com.webcodepro.applecommander.storage.FormattedDisk#getDiskName()
+	 */
+	public String getDiskName() {
+		if (logicalOffset == OZDOS_DISK_1) {
+			return super.getDiskName() + " (Disk 1)";
+		} else if (logicalOffset == OZDOS_DISK_2) {
+			return super.getDiskName() + " (Disk 2)";
+		} else {
+			return super.getDiskName();
+		}
+	}
+	/**
+	 * Returns the logical disk number.  This can be used to identify
+	 * between disks when a format supports multiple logical volumes.
+	 */
+	public int getLogicalDiskNumber() {
+		if (logicalOffset == OZDOS_DISK_1) {
+			return 1;
+		} else if (logicalOffset == OZDOS_DISK_2) {
+			return 2;
+		} else {
+			return 0;
+		}
+	}
+	/**
+	 * Compute the track and sector offset into the disk image.
+	 * This varies with OzDOS.
+	 */
+	protected int getOffset(int track, int sector) throws IllegalArgumentException {
+		if ((track * 32 + sector) * SECTOR_SIZE > getPhysicalSize()) {
+			throw new IllegalArgumentException(
+				"The track (" + track + ") and sector (" + sector 
+				+ ") do not match the disk image size.");
+		} else if (isProdosOrder()) {
+			return ((track * 32) + sector) * BLOCK_SIZE + logicalOffset;
+		} else {
+			// Note that DOS format is unexpected.
+			throw new IllegalArgumentException(
+				"Unknown disk format.");
+		}
+	}
+	/**
+	 * Format the disk as OzDOS.
+	 * @see com.webcodepro.applecommander.storage.FormattedDisk#format()
+	 */
+	public void format() {
+		format(31, 50, 32);
+	}
+}