rossi.fstools.fs.ext2fs
Class Ext2FileSystem

java.lang.Object
  rossi.fstools.fs.ext2fs.Ext2FileSystem

All Implemented Interfaces:

FileSystem

public class Ext2FileSystem

extends java.lang.Object

implements FileSystem

Implementation of the EXT2 and EXT3 file systems.

Field Summary

static long	EXT2_BAD_INO Inode number of the bad blocks file.
static long	EXT2_ROOT_INO Inode number of the root directory.

Constructor Summary

Ext2FileSystem()

Method Summary

void	close() Close the underlying BlockReader used by this file system.
Device	createExt2Device(Ext2Inode inode) Create a device.
Directory	createExt2Directory(Ext2Inode inode) Create a directory.
File	createExt2File(Ext2Inode inode) Creates a file from an inode
SymLink	createExt2SymLink(Ext2Inode inode) Create a symlink.
Inode	getInode(InodePtr ptr) Gets an inode.
FsObject	getObject(Inode inode) Get the filesystem object represented by an inode.
InodePtr	getRootDir() Get a pointer to the root directory's inode.
SuperBlock	open(BlockReader br) Open a file system for reading.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EXT2_BAD_INO

public static final long EXT2_BAD_INO

Inode number of the bad blocks file.

See Also:

Constant Field Values

EXT2_ROOT_INO

public static final long EXT2_ROOT_INO

Inode number of the root directory.

See Also:

Constant Field Values

Constructor Detail

Ext2FileSystem

public Ext2FileSystem()

Method Detail

open

public SuperBlock open(BlockReader br)
                throws FsException,
                       java.io.IOException

Description copied from interface: FileSystem

Open a file system for reading. The BlockReader should be initialized to point to the phyical storage of the desired filesystem.

Specified by:

open in interface FileSystem

Parameters:

br - a BlockReader for accessing the physical filesystem.

Returns:

the filesystem's SuperBlock

Throws:

java.io.IOException

FsException - if the superblock cannot be parsed.

close

public void close()
           throws java.io.IOException

Description copied from interface: FileSystem

Close the underlying BlockReader used by this file system.

Specified by:

close in interface FileSystem

Throws:

java.io.IOException

getRootDir

public InodePtr getRootDir()

Description copied from interface: FileSystem

Get a pointer to the root directory's inode.

Specified by:

getRootDir in interface FileSystem

Returns:

InodePtr pointing to the root directory.

getInode

public Inode getInode(InodePtr ptr)
               throws FsException,
                      java.io.IOException

Gets an inode. Uses the inode pointer supplied to load an inode.

Specified by:

getInode in interface FileSystem

Parameters:

ptr - an InodePtr

Returns:

Inode pointed to by ptr

Throws:

FsException - if the Inode cannot be parsed.

java.io.IOException - if an IO error occurs

createExt2File

public File createExt2File(Ext2Inode inode)
                    throws FsException,
                           java.io.IOException

Creates a file from an inode

Parameters:

inode - the inode

Returns:

the file

Throws:

java.io.IOException - in case of an IO error

FSException - in case of a FS format error

FsException

createExt2Directory

public Directory createExt2Directory(Ext2Inode inode)
                              throws FsException,
                                     java.io.IOException

Create a directory.

Parameters:

inode - a Ext2Inode

Returns:

Directory

Throws:

FsException

java.io.IOException

createExt2Device

public Device createExt2Device(Ext2Inode inode)

Create a device.

Parameters:

inode - a Ext2Inode

Returns:

Device

createExt2SymLink

public SymLink createExt2SymLink(Ext2Inode inode)
                          throws FsException,
                                 java.io.IOException

Create a symlink. Note the blocks field of the inode controls whether it is a fast or slow symlink.

Parameters:

inode - a Ext2Inode

Returns:

SymLink

Throws:

FsException

java.io.IOException

getObject

public FsObject getObject(Inode inode)
                   throws FsException,
                          java.io.IOException

Description copied from interface: FileSystem

Get the filesystem object represented by an inode.

Specified by:

getObject in interface FileSystem

Parameters:

inode - an Inode

Returns:

FsObject that is represented by the inode

Throws:

FsException - if the object cannot be parsed.

java.io.IOException - if an IO error occurs.