/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.fat;
import java.io.IOException;
import java.util.HashMap;
import org.jnode.driver.Device;
import org.jnode.driver.block.BlockDeviceAPI;
import org.jnode.fs.FSDirectory;
import org.jnode.fs.FSEntry;
import org.jnode.fs.FSFile;
import org.jnode.fs.FileSystemException;
import org.jnode.fs.spi.AbstractFileSystem;
/**
* @author epr
*/
public class FatFileSystem extends AbstractFileSystem<FatRootEntry> {
private BootSector bs;
private Fat fat;
private final FatDirectory rootDir;
private final FatRootEntry rootEntry;
private final HashMap<FatDirEntry, FatFile> files = new HashMap<FatDirEntry, FatFile>();
/**
* Constructor for FatFileSystem in specified readOnly mode
*/
public FatFileSystem(Device device, boolean readOnly, FatFileSystemType type) throws FileSystemException {
super(device, readOnly, type); // false = read/write mode
try {
bs = new BootSector(512);
bs.read(getApi());
// if (!bs.isaValidBootSector()) throw new FileSystemException(
// "Can't mount this partition: Invalid BootSector");
// System.out.println(bs);
Fat[] fats = new Fat[bs.getNrFats()];
rootDir = new FatLfnDirectory(this, bs.getNrRootDirEntries());
FatType bitSize;
if (bs.getMediumDescriptor() == 0xf8) {
bitSize = FatType.FAT16;
} else {
bitSize = FatType.FAT12;
}
for (int i = 0; i < fats.length; i++) {
Fat fat = new Fat(bitSize, bs.getMediumDescriptor(), bs.getSectorsPerFat(), bs.getBytesPerSector());
fats[i] = fat;
fat.read(getApi(), FatUtils.getFatOffset(bs, i));
}
for (int i = 1; i < fats.length; i++) {
if (!fats[0].equals(fats[i])) {
System.out.println("FAT " + i + " differs from FAT 0");
}
}
fat = fats[0];
rootDir.read(getApi(), FatUtils.getRootDirOffset(bs));
rootEntry = new FatRootEntry(rootDir);
// files = new FatFile[fat.getNrEntries()];
} catch (IOException ex) {
throw new FileSystemException(ex);
} catch (Exception e) { // something bad happened in the FAT boot
// sector... just ignore this FS
throw new FileSystemException(e);
}
}
/**
* Flush all changed structures to the device.
*
* @throws IOException
*/
public void flush() throws IOException {
final BlockDeviceAPI api = getApi();
if (bs.isDirty()) {
bs.write(api);
}
for (FatFile f : files.values()) {
f.flush();
}
if (fat.isDirty()) {
for (int i = 0; i < bs.getNrFats(); i++) {
fat.write(api, FatUtils.getFatOffset(bs, i));
}
}
if (rootDir.isDirty()) {
rootDir.flush();
}
}
/**
* Gets the root entry of this filesystem. This is usually a directory, but this is not required.
*/
public FatRootEntry getRootEntry() {
return rootEntry;
}
/**
* Gets the file for the given entry.
*
* @param entry
*/
public synchronized FatFile getFile(FatDirEntry entry) {
FatFile file = files.get(entry);
if (file == null) {
file = new FatFile(this, entry, entry.getStartCluster(), entry.getLength(), entry.isDirectory());
files.put(entry, file);
}
return file;
}
public int getClusterSize() {
return bs.getBytesPerSector() * bs.getSectorsPerCluster();
}
/**
* Returns the fat.
*
* @return Fat
*/
public Fat getFat() {
return fat;
}
/**
* Returns the bootsector.
*
* @return BootSector
*/
public BootSector getBootSector() {
return bs;
}
/**
* Returns the rootDir.
*
* @return RootDirectory
*/
public FatDirectory getRootDir() {
return rootDir;
}
/**
*
*/
protected FSFile createFile(FSEntry entry) throws IOException {
// TODO Auto-generated method stub
return null;
}
/**
*
*/
protected FSDirectory createDirectory(FSEntry entry) throws IOException {
// TODO Auto-generated method stub
return null;
}
/**
*
*/
protected FatRootEntry createRootEntry() throws IOException {
// TODO Auto-generated method stub
return null;
}
public long getFreeSpace() {
// TODO implement me
return -1;
}
public long getTotalSpace() {
// TODO implement me
return -1;
}
public long getUsableSpace() {
// TODO implement me
return -1;
}
@Override
public String getVolumeName() throws IOException {
return ""; // TODO implement me
}
}