Package com.itextpdf.io.codec
Class TIFFLZWDecoder
- java.lang.Object
-
- com.itextpdf.io.codec.TIFFLZWDecoder
-
public class TIFFLZWDecoder extends java.lang.Object
A class for performing LZW decoding.
-
-
Field Summary
Fields Modifier and Type Field Description (package private) int[]
andTable
(package private) int
bitPointer
(package private) int
bitsToGet
(package private) int
bytePointer
(package private) byte[]
data
(package private) int
dstIndex
(package private) int
h
(package private) int
nextBits
(package private) int
nextData
(package private) int
predictor
(package private) int
samplesPerPixel
(package private) byte[][]
stringTable
(package private) int
tableIndex
(package private) byte[]
uncompData
(package private) int
w
-
Constructor Summary
Constructors Constructor Description TIFFLZWDecoder(int w, int predictor, int samplesPerPixel)
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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)
AppendnewString
to the end ofoldString
.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.
-
-
-
Field Detail
-
stringTable
byte[][] stringTable
-
data
byte[] data
-
uncompData
byte[] uncompData
-
tableIndex
int tableIndex
-
bitsToGet
int bitsToGet
-
bytePointer
int bytePointer
-
bitPointer
int bitPointer
-
dstIndex
int dstIndex
-
w
int w
-
h
int h
-
predictor
int predictor
-
samplesPerPixel
int samplesPerPixel
-
nextData
int nextData
-
nextBits
int nextBits
-
andTable
int[] andTable
-
-
Method Detail
-
decode
public byte[] decode(byte[] data, byte[] uncompData, int h)
Method to decode LZW compressed data.- Parameters:
data
- The compressed datauncompData
- Array to return the uncompressed data inh
- 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 tablenewString
- 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)
AppendnewString
to the end ofoldString
.- Parameters:
oldString
- the byte string at the end of which the new string will be writtennewString
- 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()
-
-