115 lines
3.4 KiB
Java
115 lines
3.4 KiB
Java
/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2003 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.physical;
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import com.webcodepro.applecommander.storage.Disk;
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import com.webcodepro.applecommander.storage.StorageBundle;
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import com.webcodepro.applecommander.util.TextBundle;
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/**
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* Supports disk images stored in ProDOS physical order.
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* <p>
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* @author Rob Greene (RobGreene@users.sourceforge.net)
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*/
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public class ProdosOrder extends ImageOrder {
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private TextBundle textBundle = StorageBundle.getInstance();
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/**
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* This table contains the block offset for a particular DOS sector.
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*/
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private static final int[] blockInterleave = {
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0, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 7
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};
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/**
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* Defines the location within a block in which the DOS sector resides.
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* (0 = 0-255 and 1 = 256-511.)
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*/
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private static final int[] blockOffsets = {
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0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1
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};
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/**
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* Construct a ProdosOrder.
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*/
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public ProdosOrder(ByteArrayImageLayout diskImageManager) {
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super(diskImageManager);
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}
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/**
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* Indicates that this device is block ordered.
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*/
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public boolean isBlockDevice() {
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return true;
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}
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/**
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* Indicates that this device is track and sector ordered.
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*/
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public boolean isTrackAndSectorDevice() {
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return false;
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}
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/**
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* Read the block from the disk image.
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* Note: Defined in terms of reading sectors.
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*/
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public byte[] readBlock(int block) {
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return readBytes(block * Disk.BLOCK_SIZE, Disk.BLOCK_SIZE);
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}
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/**
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* Write the block to the disk image.
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* Note: Defined in terms of reading sectors.
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*/
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public void writeBlock(int block, byte[] data) {
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writeBytes(block * Disk.BLOCK_SIZE, data);
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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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int block = track * 8 + blockInterleave[sector];
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byte[] blockData = readBlock(block);
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int offset = blockOffsets[sector];
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byte[] sectorData = new byte[Disk.SECTOR_SIZE];
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System.arraycopy(blockData, offset * Disk.SECTOR_SIZE,
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sectorData, 0, Disk.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) throws IllegalArgumentException {
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int block = track * 8 + blockInterleave[sector];
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byte[] blockData = readBlock(block);
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int offset = blockOffsets[sector];
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System.arraycopy(bytes, 0, blockData, offset * Disk.SECTOR_SIZE, bytes.length);
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writeBlock(block, blockData);
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}
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/**
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* Return the name of this image order.
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*/
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public String getName() {
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return textBundle.get("ProdosOrder.OrderName"); //$NON-NLS-1$
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}
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}
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