/* * 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; import java.util.ArrayList; import java.util.BitSet; import java.util.Date; import java.util.Iterator; import java.util.List; /** * Manages a disk that is in the Pascal format. *
* Date created: Oct 4, 2002 11:56:50 PM
* @author: Rob Greene
*/
public class PascalFormatDisk extends FormattedDisk {
/**
* The size of the Pascal file entry.
*/
public static final int ENTRY_SIZE = 26;
/**
* The number of Pascal blocks on a 140K disk.
*/
public static final int PASCAL_BLOCKS_ON_140K_DISK = 280;
/**
* Use this inner interface for managing the disk usage data.
* This offloads format-specific implementation to the implementing class.
* A BitSet is used to track all blocks, as Pascal disks do not have a
* bitmap stored on the disk. This is safe since we know the number of blocks
* that exist. (BitSet length is of last set bit - unset bits at the end are
* "lost".)
*/
private class PascalDiskUsage implements DiskUsage {
private int location = -1;
private BitSet bitmap = null;
public boolean hasNext() {
return location == -1 || location < getBlocksOnDisk() - 1;
}
public void next() {
if (bitmap == null) {
bitmap = new BitSet(getBlocksOnDisk());
// assume all blocks are unused
for (int block=6; block