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com.sun.imageio.plugins.common

public Class LZWCompressor

Class Inheritance

extends Object

java.lang.Object
com.sun.imageio.plugins.common.LZWCompressor

Imports

java.io.IOException, .PrintStream, javax.imageio.stream.ImageOutputStream

Field Summary

Modifier and Type	Field and Description
pack-priv BitFile	bf output destination for bit codes
pack-priv int	clearCode reserved clear code based on code size
pack-priv int	codeSize base underlying code size of data being compressed 8 for TIFF, 1 to 8 for GIF
pack-priv int	endOfInfo reserved end of data code based on code size
pack-priv int	limit limit at which current number of bits code size has to be increased
pack-priv LZWStringTable	lzss general purpose LZW string table
pack-priv int	numBits current number bits output for each code
pack-priv short	prefix the prefix code which represents the predecessor string to current input point
pack-priv boolean	tiffFudge modify the limits of the code values in LZW encoding due to TIFF bug / feature

Constructor Summary

Access	Constructor and Description
public	LZWCompressor(ImageOutputStream destination for compressed data out, int the initial code size for the LZW compressor codeSize, boolean flag indicating that TIFF lzw fudge needs to be applied TIFF)

Method Summary

Modifier and Type	Method and Description
public void	compress(byte[] data to be compressed to output stream buf, int offset, int length)
public void	dump(PrintStream out)
public void	flush()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

bf	back to summary
pack-priv BitFile bf output destination for bit codes

clearCode	back to summary
pack-priv int clearCode reserved clear code based on code size

codeSize	back to summary
pack-priv int codeSize base underlying code size of data being compressed 8 for TIFF, 1 to 8 for GIF

endOfInfo	back to summary
pack-priv int endOfInfo reserved end of data code based on code size

limit	back to summary
pack-priv int limit limit at which current number of bits code size has to be increased

lzss	back to summary
pack-priv LZWStringTable lzss general purpose LZW string table

numBits	back to summary
pack-priv int numBits current number bits output for each code

prefix	back to summary
pack-priv short prefix the prefix code which represents the predecessor string to current input point

tiffFudge	back to summary
pack-priv boolean tiffFudge modify the limits of the code values in LZW encoding due to TIFF bug / feature

Constructor Detail

LZWCompressor	back to summary
public LZWCompressor(ImageOutputStream out, int codeSize, boolean TIFF) throws IOException Parameters out:ImageOutputStream destination for compressed data codeSize:int the initial code size for the LZW compressor TIFF:boolean flag indicating that TIFF lzw fudge needs to be applied Exceptions IOException: if underlying output stream error

Method Detail

compress	back to summary
public void compress(byte[] buf, int offset, int length) throws IOException Parameters buf:byte[] data to be compressed to output stream Exceptions IOException: if underlying output stream error

dump	back to summary
public void dump(PrintStream out)

flush	back to summary
public void flush() throws IOException