org.apache.pdfbox.filter

Class LZWFilter

java.lang.Object

org.apache.pdfbox.filter.Filter

org.apache.pdfbox.filter.LZWFilter

public class LZWFilter
extends Filter

This is the filter used for the LZWDecode filter.

Author:

Ben Litchfield, Tilman Hausherr

Field Summary

Fields

Modifier and Type	Field and Description
static long	CLEAR_TABLE The LZW clear table code.
static long	EOD The LZW end of data code.

Constructor Summary

Constructors

Constructor and Description
LZWFilter()

Method Summary

Methods

Modifier and Type	Method and Description
DecodeResult	decode(InputStream encoded, OutputStream decoded, COSDictionary parameters, int index) Decodes data, producing the original non-encoded data.
protected void	encode(InputStream rawData, OutputStream encoded, COSDictionary parameters)

Methods inherited from class org.apache.pdfbox.filter.Filter

encode, findImageReader, getDecodeParams

Methods inherited from class java.lang.Object

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

Field Detail

CLEAR_TABLE

public static final long CLEAR_TABLE

The LZW clear table code.

See Also:

Constant Field Values

EOD

public static final long EOD

The LZW end of data code.

See Also:

Constant Field Values

Constructor Detail

LZWFilter

public LZWFilter()

Method Detail

decode

public DecodeResult decode(InputStream encoded,
                  OutputStream decoded,
                  COSDictionary parameters,
                  int index)
                    throws IOException

Decodes data, producing the original non-encoded data.

Specified by:

decode in class Filter

Parameters:

encoded - the encoded byte stream

decoded - the stream where decoded data will be written

parameters - the parameters used for decoding

index - the index to the filter being decoded

Returns:

repaired parameters dictionary, or the original parameters dictionary

Throws:

IOException - if the stream cannot be decoded

encode

protected void encode(InputStream rawData,
          OutputStream encoded,
          COSDictionary parameters)
               throws IOException

Specified by:

encode in class Filter

Throws:

IOException