Class MyLzwCompressor

java.lang.Object

org.apache.commons.imaging.mylzw.MyLzwCompressor

public class MyLzwCompressor
extends Object

Nested Class Summary

Nested Classes

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

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
MyLzwCompressor(int initialCodeSize, ByteOrder byteOrder, boolean earlyLimit)
MyLzwCompressor(int initialCodeSize, 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 Object

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

Field Details

codeSize

private int codeSize

initialCodeSize

private final int initialCodeSize

codes

private int codes

byteOrder

private final 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 Map<MyLzwCompressor.ByteArray, Integer> map

Constructor Details

MyLzwCompressor

public MyLzwCompressor(int initialCodeSize,
 ByteOrder byteOrder,
 boolean earlyLimit)

MyLzwCompressor

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

Method Details

addTableEntry

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

Throws:

IOException

addTableEntry

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

Throws:

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 IOException

Throws:

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 IOException

Throws:

IOException

writeCode

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

Throws:

IOException

writeDataCode

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

Throws:

IOException

writeEoiCode

private void writeEoiCode(MyBitOutputStream bos)
                   throws IOException

Throws:

IOException