Package org.jpedal.io.filter

Class LZW

java.lang.Object

com.idrsolutions.image.filter.Filter

com.idrsolutions.image.filter.PredictorFilter

org.jpedal.io.filter.LZW

public class LZW
extends PredictorFilter

Class for the decoding of LZW encoded data from PDFs

Constructor Summary

Constructors

Constructor	Description
LZW(FilterOptions options, int width, int height)

Method Summary

Modifier and Type	Method	Description
byte[]	decode(byte[] data)	LZW decode
void	decode(BufferedInputStream bis, BufferedOutputStream streamCache, String cacheName, Map<String,String> cachedObjects)	LZW decode
byte[]	decompress(byte[] input, boolean earlyChange)
void	decompress(byte[] output, byte[] input, boolean earlyChange)
void	decompress(BufferedOutputStream output, BufferedInputStream input, boolean earlyChange)
byte[]	encode(byte[] buffer)	LZW encode
void	encode(BufferedInputStream bis, BufferedOutputStream bos)	LZW encode

Methods inherited from class com.idrsolutions.image.filter.Filter

hasError, setEncHash, setupCachedObjectForDecoding

Methods inherited from class java.lang.Object

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

Constructor Details

LZW

public LZW(FilterOptions options,
 int width,
 int height)

Method Details

decode

public byte[] decode(byte[] data)
              throws Exception

LZW decode

Specified by:

decode in class Filter

Parameters:

data - byte[] to be decoded

Returns:

the decoded byte[]

Throws:

Exception - if data cannot be read

decode

public void decode(BufferedInputStream bis,
 BufferedOutputStream streamCache,
 String cacheName,
 Map<String,String> cachedObjects)
            throws Exception

LZW decode

Specified by:

decode in class Filter

Parameters:

bis - BufferedInputStream to be decoded

streamCache - the decoded stream

cacheName - the name of the cache object

cachedObjects - Map of the cache object

Throws:

Exception - if data cannot be read

encode

public void encode(BufferedInputStream bis,
 BufferedOutputStream bos)
            throws Exception

LZW encode

Specified by:

encode in class Filter

Parameters:

bis - BufferedInputStream to be encoded

bos - the encoded stream

Throws:

Exception - if the stream cannot be read

encode

public byte[] encode(byte[] buffer)

LZW encode

Specified by:

encode in class Filter

Parameters:

buffer - Byte[] to be encoded

Returns:

byte[] of the encoded data

decompress

public byte[] decompress(byte[] input,
 boolean earlyChange)
                  throws IOException

Throws:

IOException

decompress

public void decompress(byte[] output,
 byte[] input,
 boolean earlyChange)

decompress

public void decompress(BufferedOutputStream output,
 BufferedInputStream input,
 boolean earlyChange)
                throws IOException

Throws:

IOException