Class NufxLzw1InputStream

java.lang.Object

java.io.InputStream

com.webcodepro.shrinkit.io.NufxLzw1InputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class NufxLzw1InputStream
extends InputStream

The NufxLzw1InputStream reads a data fork or resource fork written in the NuFX LZW/1 format.

The layout of the LZW/1 data is as follows:

"Fork" Header
+0	Word	CRC-16 of the uncompressed data within the thread
+2	Byte	Low-level volume number use to format 5.25" disks
+3	Byte	RLE character used to decode this thread
Each subsequent 4K chunk of data
+0	Word	Length after RLE compression (if RLE is not used, length will be 4096
+2	Byte	A $01 indicates LZW applied to this chunk; $00 that LZW was not applied to this chunk

Note that the LZW string table is cleared after every chunk.

Constructor Summary

Constructors

Constructor	Description
NufxLzw1InputStream(LittleEndianByteInputStream dataStream)	Create the LZW/1 input stream.

Method Summary

Modifier and Type	Method	Description
long	getDataCrc()
int	getGivenCrc()
int	getRleCharacter()
int	getVolumeNumber()
boolean	isCrcValid()	Indicates if the computed CRC matches the CRC given in the data stream.
int	read()	Read the next byte in the decompressed data stream.
void	setGivenCrc(int givenCrc)
void	setRleCharacter(int rleCharacter)
void	setVolumeNumber(int volumeNumber)

Methods inherited from class InputStream

available, close, mark, markSupported, nullInputStream, read, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class Object

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

Constructor Details

NufxLzw1InputStream

public NufxLzw1InputStream(LittleEndianByteInputStream dataStream)

Create the LZW/1 input stream.

Method Details

read

public int read()
         throws IOException

Read the next byte in the decompressed data stream.

Specified by:

read in class InputStream

Throws:

IOException

isCrcValid

public boolean isCrcValid()

Indicates if the computed CRC matches the CRC given in the data stream.

getGivenCrc

public int getGivenCrc()

setGivenCrc

public void setGivenCrc(int givenCrc)

getVolumeNumber

public int getVolumeNumber()

setVolumeNumber

public void setVolumeNumber(int volumeNumber)

getRleCharacter

public int getRleCharacter()

setRleCharacter

public void setRleCharacter(int rleCharacter)

getDataCrc

public long getDataCrc()