com.itextpdf.io.codec

Class TIFFLZWDecoder

java.lang.Object

com.itextpdf.io.codec.TIFFLZWDecoder

public class TIFFLZWDecoder
extends Object

A class for performing LZW decoding.

Constructor Summary

Constructors

Constructor and Description
TIFFLZWDecoder(int w, int predictor, int samplesPerPixel)

Method Summary

Modifier and Type	Method and Description
void	addStringToTable(byte[] str) Add a new string to the string table.
void	addStringToTable(byte[] oldString, byte newString) Add a new string to the string table.
byte[]	composeString(byte[] oldString, byte newString) Append newString to the end of oldString.
byte[]	decode(byte[] data, byte[] uncompData, int h) Method to decode LZW compressed data.
int	getNextCode()
void	initializeStringTable() Initialize the string table.
void	writeString(byte[] str) Write out the string just uncompressed.

Methods inherited from class java.lang.Object

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

Constructor Detail

TIFFLZWDecoder

public TIFFLZWDecoder(int w,
                      int predictor,
                      int samplesPerPixel)

Method Detail

decode

public byte[] decode(byte[] data,
                     byte[] uncompData,
                     int h)

Method to decode LZW compressed data.

Parameters:

data - The compressed data

uncompData - Array to return the uncompressed data in

h - The number of rows the compressed data contains

Returns:

The decoded data

initializeStringTable

public void initializeStringTable()

Initialize the string table.

writeString

public void writeString(byte[] str)

Write out the string just uncompressed.

Parameters:

str - the byte string for uncompressed write out

addStringToTable

public void addStringToTable(byte[] oldString,
                             byte newString)

Add a new string to the string table.

Parameters:

oldString - the byte string at the end of which the new string will be written and which will be added to the string table

newString - the byte to be written to the end of the old string

addStringToTable

public void addStringToTable(byte[] str)

Add a new string to the string table.

Parameters:

str - the byte string which will be added to the string table

composeString

public byte[] composeString(byte[] oldString,
                            byte newString)

Append newString to the end of oldString.

Parameters:

oldString - the byte string at the end of which the new string will be written

newString - the byte to be written to the end of the old string

Returns:

the byte string which is the sum of the new string and the old string

getNextCode

public int getNextCode()