org.apache.poi.hdgf.streams

Class CompressedStreamStore

java.lang.Object

org.apache.poi.hdgf.streams.StreamStore

org.apache.poi.hdgf.streams.CompressedStreamStore

public final class CompressedStreamStore
extends StreamStore

A StreamStore where the data on-disk is compressed, using the crazy Visio LZW

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompressedStreamStore(byte[] data, int offset, int length) Creates a new compressed StreamStore, which will handle the decompression.

Method Summary

Methods

Modifier and Type	Method and Description
protected byte[]	_getBlockHeader()
protected byte[]	_getCompressedContents()
protected void	copyBlockHeaderToContents() Some kinds of streams expect their 4 byte header to be on the front of the contents.
static byte[][]	decompress(byte[] data, int offset, int length) Decompresses the given data, returning it as header + contents

Methods inherited from class org.apache.poi.hdgf.streams.StreamStore

_getContents, getContents, prependContentsWith

Methods inherited from class java.lang.Object

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

Constructor Detail

CompressedStreamStore

protected CompressedStreamStore(byte[] data,
                     int offset,
                     int length)
                         throws IOException

Creates a new compressed StreamStore, which will handle the decompression.

Throws:

IOException

Method Detail

_getCompressedContents

protected byte[] _getCompressedContents()

_getBlockHeader

protected byte[] _getBlockHeader()

copyBlockHeaderToContents

protected void copyBlockHeaderToContents()

Some kinds of streams expect their 4 byte header to be on the front of the contents. They can call this to have it sorted.

Overrides:

copyBlockHeaderToContents in class StreamStore

decompress

public static byte[][] decompress(byte[] data,
                  int offset,
                  int length)
                           throws IOException

Decompresses the given data, returning it as header + contents

Throws:

IOException