Class NufxLzw2InputStream

java.lang.Object

java.io.InputStream

org.applecommander.shrinkit.io.NufxLzw2InputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class NufxLzw2InputStream
extends 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:

  Offset	Size	Description
  +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:

  Offset	Size	Description
  +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	Description
NufxLzw2InputStream(LittleEndianByteInputStream dataStream)	Create the LZW/2 input stream.

Method Summary

Modifier and Type	Method	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 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

NufxLzw2InputStream

public NufxLzw2InputStream(LittleEndianByteInputStream dataStream)

Create the LZW/2 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

getVolumeNumber

public int getVolumeNumber()

setVolumeNumber

public void setVolumeNumber(int volumeNumber)

getRleCharacter

public int getRleCharacter()

setRleCharacter

public void setRleCharacter(int rleCharacter)

getDataCrc

public long getDataCrc()