net.sourceforge.jiu.codecs.tiff

Class TIFFDecoderDeflated


public class TIFFDecoderDeflated
extends TIFFDecoder

A TIFF decoder for files compressed with the Deflated method. This compression algorithm has the values 31946 (TIFFConstants.COMPRESSION_DEFLATED_INOFFICIAL) and 8 (TIFFConstants.COMPRESSION_DEFLATED_OFFICIAL) in the compression tag of an image file directory. All types of image data can be compressed with this method.

This decoder makes use of the package java.util.zip which comes with an Inflater class that does most of the work. All the decoder has to do is feed the Inflater object with compressed data from the input file and give decompressed data received from the Inflater to the putBytes method.

Author:
Marco Schmidt
Since:
0.9.0

Field Summary

private int
compressedSize
private DataInput
in

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

bottomRow, bufferIndex, codec, currentRow, ifd, leftColumn, processedTileRows, rightColumn, rowBuffer, tileIndex, topRow, totalTileRows

Method Summary

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

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

decode, getBytesPerRow, getCodec, getCompressionTypes, getImageFileDirectory, getInput, getTileIndex, getX1, getX2, getY1, getY2, initialize, putBytes, setCodec, setImageFileDirectory, setTileIndex, storeRow

Field Details

compressedSize

private int compressedSize

in

private DataInput in

Method Details

decode

public void decode()
            throws InvalidFileStructureException,
                   IOException
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.
Overrides:
decode in interface TIFFDecoder

getCompressionTypes

public Integer[] getCompressionTypes()
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.
Overrides:
getCompressionTypes in interface TIFFDecoder
Returns:
array with Integer objects of all TIFF compression constants supported by this decoder

initialize

public void initialize()
            throws IOException,
                   MissingParameterException
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 interface TIFFDecoder