Package org.apache.commons.imaging.mylzw

Class MyLzwCompressor

java.lang.Object

org.apache.commons.imaging.mylzw.MyLzwCompressor

public class MyLzwCompressor
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	MyLzwCompressor.ByteArray
static interface	MyLzwCompressor.Listener

Field Summary

Fields

Modifier and Type	Field	Description
private java.nio.ByteOrder	byteOrder
private int	clearCode
private int	codes
private int	codeSize
private boolean	earlyLimit
private int	eoiCode
private int	initialCodeSize
private MyLzwCompressor.Listener	listener
private java.util.Map<MyLzwCompressor.ByteArray,java.lang.Integer>	map

Constructor Summary

Constructors

Constructor	Description
MyLzwCompressor(int initialCodeSize, java.nio.ByteOrder byteOrder, boolean earlyLimit)
MyLzwCompressor(int initialCodeSize, java.nio.ByteOrder byteOrder, boolean earlyLimit, MyLzwCompressor.Listener listener)

Method Summary

Modifier and Type	Method	Description
private boolean	addTableEntry(MyBitOutputStream bos, byte[] bytes, int start, int length)
private boolean	addTableEntry(MyBitOutputStream bos, MyLzwCompressor.ByteArray key)
private MyLzwCompressor.ByteArray	arrayToKey(byte b)
private MyLzwCompressor.ByteArray	arrayToKey(byte[] bytes, int start, int length)
private void	clearTable()
private int	codeFromString(byte[] bytes, int start, int length)
byte[]	compress(byte[] bytes)
private void	incrementCodeSize()
private void	initializeStringTable()
private boolean	isInTable(byte[] bytes, int start, int length)
private void	writeClearCode(MyBitOutputStream bos)
private void	writeCode(MyBitOutputStream bos, int code)
private void	writeDataCode(MyBitOutputStream bos, int code)
private void	writeEoiCode(MyBitOutputStream bos)

Methods inherited from class java.lang.Object

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

Field Detail

codeSize

private int codeSize

initialCodeSize

private final int initialCodeSize

codes

private int codes

byteOrder

private final java.nio.ByteOrder byteOrder

earlyLimit

private final boolean earlyLimit

clearCode

private final int clearCode

eoiCode

private final int eoiCode

listener

private final MyLzwCompressor.Listener listener

map

private final java.util.Map<MyLzwCompressor.ByteArray,java.lang.Integer> map

Constructor Detail

MyLzwCompressor

public MyLzwCompressor(int initialCodeSize,
                       java.nio.ByteOrder byteOrder,
                       boolean earlyLimit)

MyLzwCompressor

public MyLzwCompressor(int initialCodeSize,
                       java.nio.ByteOrder byteOrder,
                       boolean earlyLimit,
                       MyLzwCompressor.Listener listener)

Method Detail

addTableEntry

private boolean addTableEntry(MyBitOutputStream bos,
                              byte[] bytes,
                              int start,
                              int length)
                       throws java.io.IOException

Throws:

java.io.IOException

addTableEntry

private boolean addTableEntry(MyBitOutputStream bos,
                              MyLzwCompressor.ByteArray key)
                       throws java.io.IOException

Throws:

java.io.IOException

arrayToKey

private MyLzwCompressor.ByteArray arrayToKey(byte b)

arrayToKey

private MyLzwCompressor.ByteArray arrayToKey(byte[] bytes,
                                             int start,
                                             int length)

clearTable

private void clearTable()

codeFromString

private int codeFromString(byte[] bytes,
                           int start,
                           int length)
                    throws ImagingException

Throws:

ImagingException

compress

public byte[] compress(byte[] bytes)
                throws java.io.IOException

Throws:

java.io.IOException

incrementCodeSize

private void incrementCodeSize()

initializeStringTable

private void initializeStringTable()

isInTable

private boolean isInTable(byte[] bytes,
                          int start,
                          int length)

writeClearCode

private void writeClearCode(MyBitOutputStream bos)
                     throws java.io.IOException

Throws:

java.io.IOException

writeCode

private void writeCode(MyBitOutputStream bos,
                       int code)
                throws java.io.IOException

Throws:

java.io.IOException

writeDataCode

private void writeDataCode(MyBitOutputStream bos,
                           int code)
                    throws java.io.IOException

Throws:

java.io.IOException

writeEoiCode

private void writeEoiCode(MyBitOutputStream bos)
                   throws java.io.IOException

Throws:

java.io.IOException