rossi.fstools.fs.ext2fs
Class GroupDesc

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

All Implemented Interfaces:

DiskStructure

public class GroupDesc

extends java.lang.Object

implements DiskStructure

Representation of ext2/3 group descriptor.

  On disk the superblock looks like this:

        31        24        16       8       0
        --------------------------------------
  0000  |        Block Bitmap Block          |
        --------------------------------------
  0004  |        Inode Bitmap Block          |
        --------------------------------------
  0008  |        Inode table                 |
        --------------------------------------
  000C  | Free Blocks   |  Free Inodes       |
        --------------------------------------
  0010  |  Used Dirs    |  Pad               |
        --------------------------------------
  0014  |        Reserved                    |
        --------------------------------------
  0018  |        Reserved                    |
        --------------------------------------
  001C  |        Reserved                    |
        --------------------------------------












Field Summary




protected  long
blockBitmap



           



protected  int
freeBlocks



           



protected  int
freeInodes



           



protected  long
inodeBitmap



           



protected  long
inodeTable



           



protected  int
usedDirs



           


 



Constructor Summary
GroupDesc()



           
 



Method Summary




 long
getBlockBitmap()



          Get the location of the block bitmap block for this group.



 int
getDataSize()



          Get the size in bytes of the structure.



 int
getFreeBlocks()



          Get the number of free blocks in this group.



 int
getFreeInodes()



          Get the number of free inodes in this group.



 long
getInodeBitmap()



          Get the location of the inode bitmap block for this group.



 long
getInodeTable()



          Get the location of the inode table for this group.



 int
getUsedDirs()



          Get the number of directories in this group.



 void
loadFromBuffer(byte[] buffer,
               int offset)



          Loads the object from a memory buffer



 void
setBlockBitmap(long aBlockBitmap)



           



 void
setFreeBlocks(int aFreeBlocks)



           



 void
setFreeInodes(int aFreeInodes)



           



 void
setInodeBitmap(long aInodeBitmap)



           



 void
setInodeTable(long aInodeTable)



           



 void
setUsedDirs(int aUsedDirs)



           


 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 





Field Detail



blockBitmap
protected long blockBitmap







inodeBitmap
protected long inodeBitmap







inodeTable
protected long inodeTable







freeBlocks
protected int freeBlocks







freeInodes
protected int freeInodes







usedDirs
protected int usedDirs








Constructor Detail



GroupDesc
public GroupDesc()






Method Detail



getDataSize
public int getDataSize()

Description copied from interface: DiskStructure
Get the size in bytes of the structure.  For variable length sturctures
 this may represent the minimum length rather than the actual length.


Specified by:
getDataSize in interface DiskStructure



Returns:
the size of the structure.





getBlockBitmap
public long getBlockBitmap()

Get the location of the block bitmap block for this group.






Returns:
long





setBlockBitmap
public void setBlockBitmap(long aBlockBitmap)











getInodeBitmap
public long getInodeBitmap()

Get the location of the inode bitmap block for this group.






Returns:
long





setInodeBitmap
public void setInodeBitmap(long aInodeBitmap)











getInodeTable
public long getInodeTable()

Get the location of the inode table for this group.






Returns:
long





setInodeTable
public void setInodeTable(long aInodeTable)











getFreeBlocks
public int getFreeBlocks()

Get the number of free blocks in this group.






Returns:
long





setFreeBlocks
public void setFreeBlocks(int aFreeBlocks)











getFreeInodes
public int getFreeInodes()

Get the number of free inodes in this group.






Returns:
long





setFreeInodes
public void setFreeInodes(int aFreeInodes)











getUsedDirs
public int getUsedDirs()

Get the number of directories in this group.






Returns:
long





setUsedDirs
public void setUsedDirs(int aUsedDirs)











loadFromBuffer
public void loadFromBuffer(byte[] buffer,
                           int offset)
                    throws FsException

Description copied from interface: DiskStructure
Loads the object from a memory buffer


Specified by:
loadFromBuffer in interface DiskStructure


Parameters:
buffer - a byte[] containing data to be read in populating the object
offset - a int indicating the offset within the buffer to start parsing.
Throws:
FsException - if a parse error occurs.