com.webcodepro.applecommander.storage.os.prodos.ProdosCommonDirectoryHeader Maven / Gradle / Ivy
Show all versions of AppleCommander Show documentation
/*
* AppleCommander - An Apple ][ image utility.
* Copyright (C) 2002-2022 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.os.prodos;
import com.webcodepro.applecommander.util.AppleUtil;
/**
* Provide common directory header attributes.
*
* Date created: Oct 5, 2002 11:17:00 PM
* @author Rob Greene
*/
public class ProdosCommonDirectoryHeader extends ProdosCommonEntry {
/**
* Constructor for ProdosCommonDirectoryHeader.
*/
public ProdosCommonDirectoryHeader(ProdosFormatDisk disk, int block) {
super(disk, block, 4); // directory entries are always offset 4, right?
}
/**
* Get the length of each entry. Expected to be 0x27.
*/
public int getEntryLength() {
return AppleUtil.getUnsignedByte(readFileEntry()[0x1f]);
}
/**
* Set the length of each entry.
*/
public void setEntryLength() {
byte[] data = readFileEntry();
data[0x1f] = (byte) ENTRY_LENGTH;
writeFileEntry(data);
}
/**
* Get the number of entries per block. Expected to be 0x0d.
*/
public int getEntriesPerBlock() {
return AppleUtil.getUnsignedByte(readFileEntry()[0x20]);
}
/**
* Set the number of entries per block.
*/
public void setEntriesPerBlock() {
byte[] data = readFileEntry();
data[0x20] = 0x0d;
writeFileEntry(data);
}
/**
* Get the number of active entries in the directory.
*/
public int getFileCount() {
return AppleUtil.getWordValue(readFileEntry(), 0x21);
}
/**
* Set the number of active entries in the directory.
*/
public void setFileCount(int fileCount) {
byte[] data = readFileEntry();
AppleUtil.setWordValue(data, 0x21, fileCount);
writeFileEntry(data);
}
/**
* Increment the number of active entries by one.
*/
public void incrementFileCount() {
byte[] data = readFileEntry();
data[0x21]++;
writeFileEntry(data);
}
/**
* Decrement the number of active entries by one.
*/
public void decrementFileCount() {
byte[] data = readFileEntry();
if (data[0x21] != 0) data[0x21]--;
writeFileEntry(data);
}
/**
* Get the block number of the bit map.
*/
public int getBitMapPointer() {
return AppleUtil.getWordValue(readFileEntry(), 0x23);
}
/**
* Set the block number of the bit map.
*/
public void setBitMapPointer(int blockNumber) {
byte[] data = readFileEntry();
AppleUtil.setWordValue(data, 0x23, blockNumber);
writeFileEntry(data);
}
/**
* Get the total number of blocks on this volume (only valid for volume directory block).
*/
public int getTotalBlocks() {
return AppleUtil.getWordValue(readFileEntry(), 0x25);
}
/**
* Set the total number of blocks on this volume (only valid for volume directory block).
*/
public void setTotalBlocks(int totalBlocks) {
byte[] data = readFileEntry();
AppleUtil.setWordValue(data, 0x25, totalBlocks);
writeFileEntry(data);
}
}