com.webcodepro.shrinkit.io

Class NufxLzw2InputStream

java.lang.Object

java.io.InputStream

com.webcodepro.shrinkit.io.NufxLzw2InputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class NufxLzw2InputStream
extends java.io.InputStream

The NufxLzw2InputStream reads a data fork or resource fork written in the NuFX LZW/2 format.

The layout of the LZW/2 data is as follows:

"Fork" Header
+0	Byte	Low-level volume number used to format 5.25" disks
+1	Byte	RLE character used to decode this thread
Each subsequent 4K chunk of data
+0	Word	Bits 0-12: Length after RLE compression Bit 15: LZW flag (set to 1 if LZW used)
+2	Word	If LZW flag = 1, total bytes in chunk Else (flag = 0) start of data

The LZW/2 dictionary is only cleared when the table becomes full and is indicated in the input stream by 0x100. It is also cleared whenever a chunk that is not LZW encoded is encountered.

Constructor Summary

Constructors

Constructor and Description
NufxLzw2InputStream(LittleEndianByteInputStream dataStream) Create the LZW/2 input stream.

Method Summary

Modifier and Type	Method and Description
long	getDataCrc()
int	getRleCharacter()
int	getVolumeNumber()
int	read() Read the next byte in the decompressed data stream.
void	setRleCharacter(int rleCharacter)
void	setVolumeNumber(int volumeNumber)

Methods inherited from class java.io.InputStream

available, close, mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

NufxLzw2InputStream

public NufxLzw2InputStream(LittleEndianByteInputStream dataStream)

Create the LZW/2 input stream.

Method Detail

read

public int read()
         throws java.io.IOException

Read the next byte in the decompressed data stream.

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

getVolumeNumber

public int getVolumeNumber()

setVolumeNumber

public void setVolumeNumber(int volumeNumber)

getRleCharacter

public int getRleCharacter()

setRleCharacter

public void setRleCharacter(int rleCharacter)

getDataCrc

public long getDataCrc()