116 lines
2.8 KiB
Java
116 lines
2.8 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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/**
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* Manages the layout of the physical disk. This hides implementation details,
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* such as if the disk is in 2IMG 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 ByteArrayImageLayout {
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/**
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* This is the physical copy of the disk image which a particular
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* implementation of ImageOrder will interpret.
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*/
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private byte[] diskImage;
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/**
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* Indicates if the disk image has changed.
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*/
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private boolean changed;
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/**
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* Construct a ByteArrayImageLayout.
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*/
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public ByteArrayImageLayout(byte[] diskImage) {
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setDiskImage(diskImage);
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}
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/**
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* Construct a ByteArrayImageLayout.
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*/
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public ByteArrayImageLayout(byte[] diskImage, boolean changed) {
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setDiskImage(diskImage);
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this.changed = changed;
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}
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/**
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* Construct a ByteArrayImageLayout.
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*/
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public ByteArrayImageLayout(int size) {
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diskImage = new byte[size];
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changed = true;
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}
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/**
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* Get the physical disk image.
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*/
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public byte[] getDiskImage() {
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return diskImage;
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}
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/**
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* Set the physical disk image.
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*/
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public void setDiskImage(byte[] diskImage) {
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this.diskImage = diskImage;
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changed = true;
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}
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/**
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* Answer with the physical size of this disk volume.
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*/
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public int getPhysicalSize() {
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return (diskImage != null) ? diskImage.length : 0;
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}
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/**
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* Extract a portion of the disk image.
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*/
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public byte[] readBytes(int start, int length) {
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byte[] buffer = new byte[length];
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System.arraycopy(diskImage, start, buffer, 0, length);
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return buffer;
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}
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/**
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* Write data to the disk image.
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*/
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public void writeBytes(int start, byte[] bytes) {
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changed = true;
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System.arraycopy(bytes, 0, diskImage, start, bytes.length);
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}
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/**
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* Indicates if the disk has changed. Triggered when data is
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* written and cleared when data is saved.
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*/
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public boolean hasChanged() {
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return changed;
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}
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/**
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* Set the changed indicator.
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*/
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public void setChanged(boolean changed) {
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this.changed = changed;
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}
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}
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