net.sourceforge.jiu.codecs.tiff.TIFFDecoder

net.sourceforge.jiu.codecs.tiff.TIFFDecoderModifiedHuffman

public class TIFFDecoderModifiedHuffman extends TIFFDecoder

A TIFF decoder for files compresseed with the Modified Huffman method (also known as CCITT 1D Modified Huffman Run Length Encoding). This compression algorithm has the value 2 in the compression tag of an image file directory. Only bilevel images can be encoded with that method.

Since:: 0.9.0
Author:: Marco Schmidt

Field Summary

Fields

Modifier and Type

Field

Description

private int

bitBuffer

private DataInput

in

private int

numBufferedBits
Constructor Summary

Constructors

Constructor

Description

TIFFDecoderModifiedHuffman()
Method Summary

Modifier and Type

Method

Description

void

decode()

Decode data from input and write the decompressed pixel data to the image associated with this decoder.

private int

decodeBlackRun()

private void

decodeRow(byte[] row)

private int

decodeRun(int[][][] codes, int minCodeSize)

private int

decodeWhiteRun()

Integer[]

getCompressionTypes()

Returns an array with Integer values of all compression types supported by this decoder (see the COMPRESSION_xyz constants in TIFFConstants.

void

initialize()

Check if all necessary parameters have been given to this decoder and initialize several internal fields from them.

private int

readBit()

private int

readBits(int number)

private void

reset()

Methods inherited from class net.sourceforge.jiu.codecs.tiff.TIFFDecoder
getBytesPerRow, getCodec, getImageFileDirectory, getInput, getTileIndex, getX1, getX2, getY1, getY2, putBytes, setCodec, setImageFileDirectory, setTileIndex

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- in
  
  private DataInput in
- bitBuffer
  
  private int bitBuffer
- numBufferedBits
  
  private int numBufferedBits
Constructor Details
- TIFFDecoderModifiedHuffman
  
  public TIFFDecoderModifiedHuffman()
Method Details
- decode
  
  public void decode() throws InvalidFileStructureException, IOException
  
  Description copied from class: TIFFDecoder
  
  Decode data from input and write the decompressed pixel data to the image associated with this decoder. Child classes must override this method to implement the decoding for a particular compression type.
  
  Specified by:
  
  decode in class TIFFDecoder
  
  Throws:
  
  InvalidFileStructureException
  
  IOException
- decodeBlackRun
  
  private int decodeBlackRun() throws InvalidFileStructureException, IOException
  
  Throws:
  
  InvalidFileStructureException
  
  IOException
- decodeRow
  
  private void decodeRow(byte[] row) throws InvalidFileStructureException, IOException
  
  Throws:
  
  InvalidFileStructureException
  
  IOException
- decodeRun
  
  private int decodeRun(int[][][] codes, int minCodeSize) throws InvalidFileStructureException, IOException
  
  Throws:
  
  InvalidFileStructureException
  
  IOException
- decodeWhiteRun
  
  private int decodeWhiteRun() throws InvalidFileStructureException, IOException
  
  Throws:
  
  InvalidFileStructureException
  
  IOException
- getCompressionTypes
  
  public Integer[] getCompressionTypes()
  
  Description copied from class: TIFFDecoder
  
  Returns an array with Integer values of all compression types supported by this decoder (see the COMPRESSION_xyz constants in TIFFConstants. Normally, this is only one value, but some compression types got assigned more than one constant (e.g. deflated). Also, a decoder could be capable of dealing with more than one type of compression if the compression types are similar enough to justify that. However, typically a decoder can only deal with one type of compression.
  
  Specified by:
  
  getCompressionTypes in class TIFFDecoder
  
  Returns:
  
  array with Integer objects of all TIFF compression constants supported by this decoder
- initialize
  
  public void initialize() throws IOException, MissingParameterException
  
  Description copied from class: TIFFDecoder
  
  Check if all necessary parameters have been given to this decoder and initialize several internal fields from them. Required parameters are a TIFFCodec object, a TIFFImageFileDirectory object and a tile index.
  
  Overrides:
  
  initialize in class TIFFDecoder
  
  Throws:
  
  IOException
  
  MissingParameterException
- readBit
  
  private int readBit() throws IOException
  
  Throws:
  
  IOException
- readBits
  
  private int readBits(int number) throws IOException
  
  Throws:
  
  IOException
- reset
  
  private void reset()

Class TIFFDecoderModifiedHuffman

Field Summary

Constructor Summary

Method Summary

Methods inherited from class net.sourceforge.jiu.codecs.tiff.TIFFDecoder

Methods inherited from class java.lang.Object

Field Details

in

bitBuffer

numBufferedBits

Constructor Details

TIFFDecoderModifiedHuffman

Method Details

decode

decodeBlackRun

decodeRow

decodeRun

decodeWhiteRun

getCompressionTypes

initialize

readBit

readBits

reset