Package org.apache.poi.poifs.storage

Class HeaderBlock

java.lang.Object

org.apache.poi.poifs.storage.HeaderBlock

All Implemented Interfaces:

HeaderBlockConstants

public final class HeaderBlock
extends Object
implements HeaderBlockConstants

The block containing the archive header

Field Summary

Fields inherited from interface org.apache.poi.poifs.storage.HeaderBlockConstants

_bat_array_offset, _bat_count_offset, _max_bats_in_header, _property_start_offset, _sbat_block_count_offset, _sbat_start_offset, _signature, _signature_offset, _xbat_count_offset, _xbat_start_offset

Constructor Summary

Constructors

Constructor	Description
HeaderBlock(InputStream stream)	create a new HeaderBlockReader from an InputStream
HeaderBlock(ByteBuffer buffer)
HeaderBlock(POIFSBigBlockSize bigBlockSize)	Create a single instance initialized with default values

Method Summary

Modifier and Type	Method	Description
int[]	getBATArray()	Returns the offsets to the first (up to) 109 BAT sectors.
int	getBATCount()
POIFSBigBlockSize	getBigBlockSize()
int	getPropertyStart()	get start of Property Table
int	getSBATCount()
int	getSBATStart()
int	getXBATCount()
int	getXBATIndex()
void	setBATArray(int[] bat_array)	Sets the offsets of the first (up to) 109 BAT sectors.
void	setBATCount(int count)	Sets the number of BAT blocks that are used.
void	setPropertyStart(int startBlock)	Set start of Property Table
void	setSBATBlockCount(int count)	Set count of SBAT blocks
void	setSBATStart(int startBlock)	Set start of small block allocation table
void	setXBATCount(int count)	Sets the number of XBAT (DIFAT) blocks used
void	setXBATStart(int startBlock)	Sets the first XBAT (DIFAT) block location
void	writeData(OutputStream stream)	Write the block's data to an OutputStream

Methods inherited from class java.lang.Object

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

Constructor Detail

HeaderBlock

public HeaderBlock(InputStream stream)
            throws IOException

create a new HeaderBlockReader from an InputStream

Parameters:

stream - the source InputStream

Throws:

IOException - on errors or bad data

HeaderBlock

public HeaderBlock(ByteBuffer buffer)
            throws IOException

Throws:

IOException

HeaderBlock

public HeaderBlock(POIFSBigBlockSize bigBlockSize)

Create a single instance initialized with default values

Method Detail

getPropertyStart

public int getPropertyStart()

get start of Property Table

Returns:

the index of the first block of the Property Table

setPropertyStart

public void setPropertyStart(int startBlock)

Set start of Property Table

Parameters:

startBlock - the index of the first block of the Property Table

getSBATStart

public int getSBATStart()

Returns:

start of small block (MiniFAT) allocation table

getSBATCount

public int getSBATCount()

setSBATStart

public void setSBATStart(int startBlock)

Set start of small block allocation table

Parameters:

startBlock - the index of the first big block of the small block allocation table

setSBATBlockCount

public void setSBATBlockCount(int count)

Set count of SBAT blocks

Parameters:

count - the number of SBAT blocks

getBATCount

public int getBATCount()

Returns:

number of BAT blocks

setBATCount

public void setBATCount(int count)

Sets the number of BAT blocks that are used. This is the number used in both the BAT and XBAT.

getBATArray

public int[] getBATArray()

Returns the offsets to the first (up to) 109 BAT sectors. Any additional BAT sectors are held in the XBAT (DIFAT) sectors in a chain.

Returns:

BAT offset array

setBATArray

public void setBATArray(int[] bat_array)

Sets the offsets of the first (up to) 109 BAT sectors.

getXBATCount

public int getXBATCount()

Returns:

XBAT (DIFAT) count

setXBATCount

public void setXBATCount(int count)

Sets the number of XBAT (DIFAT) blocks used

getXBATIndex

public int getXBATIndex()

Returns:

XBAT (DIFAT) index

setXBATStart

public void setXBATStart(int startBlock)

Sets the first XBAT (DIFAT) block location

getBigBlockSize

public POIFSBigBlockSize getBigBlockSize()

Returns:

The Big Block size, normally 512 bytes, sometimes 4096 bytes

writeData

public void writeData(OutputStream stream)
               throws IOException

Write the block's data to an OutputStream

Parameters:

stream - the OutputStream to which the stored data should be written

Throws:

IOException - on problems writing to the specified stream