240 lines
6.7 KiB
Java
240 lines
6.7 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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import java.text.NumberFormat;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Handle RDOS file entry format.
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* <p>
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* Since I was unable to locate the file entries on the internet, it is documented here:
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* <tt>
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* Offset Description<br>
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* ====== ====================================================<br>
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* $00-$17 File name; space-filled. If the first byte is $00, that is the end of the<br>
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* directory. If the first byte is $80, the file is deleted.<br>
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* $18 File type. Appears to be actual letter ('A'=Applesoft, etc)<br>
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* $19 File length in blocks (block = sector = 256 bytes)<br>
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* $1A-$1B Address of application. For Applesoft and binary; others may vary.<br>
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* $1C-$1D Length in bytes of file.<br>
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* $1E-$1F Starting block of application.<br>
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* </tt>
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* <p>
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* Date created: Oct 7, 2002 1:36:56 PM
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* @author: Rob Greene
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*/
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public class RdosFileEntry implements FileEntry {
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private byte[] fileEntry;
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private RdosFormatDisk disk;
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/**
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* Constructor for RdosFileEntry.
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*/
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public RdosFileEntry(byte[] fileEntry, RdosFormatDisk disk) {
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super();
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this.fileEntry = fileEntry;
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this.disk = disk;
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}
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/**
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* Return the number of blocks this file uses.
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*/
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public int getSizeInBlocks() {
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return AppleUtil.getUnsignedByte(fileEntry[0x19]);
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}
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/**
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* Return the starting block of this application.
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*/
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public int getStartingBlock() {
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return AppleUtil.getWordValue(fileEntry, 0x1e);
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}
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/**
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* Return the address of application.
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*/
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public int getAddress() {
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return AppleUtil.getWordValue(fileEntry, 0x1a);
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}
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/**
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* Return the name of this file.
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*/
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public String getFilename() {
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return isDeleted() ? "<NOT IN USE> " : AppleUtil.getString(fileEntry, 0, 24);
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}
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/**
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* Return the filetype of this file.
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*/
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public String getFiletype() {
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return isDeleted() ? " " : AppleUtil.getString(fileEntry, 0x18, 1);
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}
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/**
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* Locked doesn't appear to be a concept under RDOS.
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*/
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public boolean isLocked() {
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return false;
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}
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/**
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* Compute the size of this file (in bytes).
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*/
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public int getSize() {
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return AppleUtil.getWordValue(fileEntry, 0x1c);
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}
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/**
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* RDOS does not support directories.
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*/
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public boolean isDirectory() {
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return false;
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}
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/**
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* Retrieve the list of files in this directory.
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* Since RDOS does not support directories, this will always return null.
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*/
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public List getFiles() {
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return null;
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}
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/**
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* Identify if this file has been deleted.
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*/
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public boolean isDeleted() {
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return AppleUtil.getUnsignedByte(fileEntry[0]) == 0x80;
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}
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/**
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* Get the standard file column header information.
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* This default implementation is intended only for standard mode.
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* displayMode is specified in FormattedDisk.
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*/
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public List getFileColumnData(int displayMode) {
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NumberFormat numberFormat = NumberFormat.getNumberInstance();
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List list = new ArrayList();
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switch (displayMode) {
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case FormattedDisk.FILE_DISPLAY_NATIVE:
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list.add(getFiletype());
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numberFormat.setMinimumIntegerDigits(3);
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list.add(numberFormat.format(getSizeInBlocks()));
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list.add(getFilename());
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numberFormat.setMinimumIntegerDigits(1);
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list.add(numberFormat.format(getSize()));
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numberFormat.setMinimumIntegerDigits(3);
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list.add(numberFormat.format(getStartingBlock()));
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break;
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case FormattedDisk.FILE_DISPLAY_DETAIL:
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list.add(getFiletype());
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numberFormat.setMinimumIntegerDigits(3);
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list.add(numberFormat.format(getSizeInBlocks()));
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list.add(getFilename());
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numberFormat.setMinimumIntegerDigits(1);
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list.add(numberFormat.format(getSize()));
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numberFormat.setMinimumIntegerDigits(3);
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list.add(numberFormat.format(getStartingBlock()));
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list.add("$" + AppleUtil.getFormattedWord(getAddress()));
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list.add(isDeleted() ? "Deleted" : "");
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break;
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default: // FILE_DISPLAY_STANDARD
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list.add(getFilename());
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list.add(getFiletype());
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list.add(numberFormat.format(getSize()));
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list.add(isLocked() ? "Locked" : "");
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break;
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}
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return list;
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}
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/**
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* Get file data. This handles any operating-system specific issues.
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* Currently, the disk itself handles this.
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*/
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public byte[] getFileData() {
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byte[] rawdata = disk.getFileData(this);
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byte[] filedata = new byte[getSize()];
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System.arraycopy(rawdata, 0, filedata, 0, filedata.length);
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return filedata;
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}
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/**
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* Get the suggested FileFilter. This appears to be operating system
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* specific, so each operating system needs to implement some manner
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* of guessing the appropriate filter.
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* FIXME - this code should be a helper class for DOS and RDOS!
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*/
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public FileFilter getSuggestedFilter() {
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if (isApplesoftBasicFile()) {
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return new ApplesoftFileFilter();
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} else if (isIntegerBasicFile()) {
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return new IntegerBasicFileFilter();
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} else if (isTextFile()) {
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return new TextFileFilter();
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} else if (isBinaryFile()) {
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int size = getSize();
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// the minimum size is guessed a bit - I don't remember, but maybe there
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// are 8 spare bytes at the end of the graphics screen
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GraphicsFileFilter filter = new GraphicsFileFilter();
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if (size >= 8185 && size <= 8192) {
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filter.setMode(GraphicsFileFilter.MODE_HGR_COLOR);
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return filter;
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} else if (size >= 16377 && size <= 16384) {
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filter.setMode(GraphicsFileFilter.MODE_DHR_COLOR);
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return filter;
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}
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// fall through to BinaryFileFilter...
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}
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return new BinaryFileFilter();
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}
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/**
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* Determine if this is a text file.
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*/
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public boolean isTextFile() {
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return "T".equals(getFiletype());
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}
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/**
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* Determine if this is an Applesoft BASIC file.
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*/
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public boolean isApplesoftBasicFile() {
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return "A".equals(getFiletype());
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}
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/**
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* Determine if this is an Integer BASIC file.
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*/
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public boolean isIntegerBasicFile() {
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return "I".equals(getFiletype());
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}
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/**
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* Determine if this is a binary file.
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*/
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public boolean isBinaryFile() {
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return "B".equals(getFiletype());
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}
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}
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