Class CCITTFaxDecoderStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.twelvemonkeys.imageio.plugins.tiff.CCITTFaxDecoderStream

All Implemented Interfaces:

Closeable, AutoCloseable

final class CCITTFaxDecoderStream
extends FilterInputStream

CCITT Modified Huffman RLE, Group 3 (T4) and Group 4 (T6) fax compression.

Version:

$Id: CCITTFaxDecoderStream.java,v 1.0 23.05.12 15:55 haraldk Exp$

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	CCITTFaxDecoderStream.Node
private static final class	CCITTFaxDecoderStream.Tree

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final short[][]	BLACK_CODES
(package private) static final short[][]	BLACK_RUN_LENGTHS
(package private) static final CCITTFaxDecoderStream.Tree	blackRunTree
(package private) int	buffer
(package private) int	bufferPos
private int[]	changesCurrentRow
private int	changesCurrentRowCount
private int[]	changesReferenceRow
private int	changesReferenceRowCount
(package private) static final CCITTFaxDecoderStream.Tree	codeTree
private final int	columns
private int	decodedLength
private int	decodedPos
private final byte[]	decodedRow
(package private) static final CCITTFaxDecoderStream.Node	EOL
(package private) static final CCITTFaxDecoderStream.Tree	eolOnlyTree
(package private) static final CCITTFaxDecoderStream.Node	FILL
private int	lastChangingElement
private final boolean	optionByteAligned
private final boolean	optionG32D
private final boolean	optionG3Fill
private final boolean	optionUncompressed
private int	rowsLeft
private final int	type
(package private) static final int	VALUE_EOL
(package private) static final int	VALUE_FILL
(package private) static final int	VALUE_HMODE
(package private) static final int	VALUE_PASSMODE
static final short[][]	WHITE_CODES
static final short[][]	WHITE_RUN_LENGTHS
(package private) static final CCITTFaxDecoderStream.Tree	whiteRunTree

Fields inherited from class FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
CCITTFaxDecoderStream(InputStream stream, int columns, int rows, int type, long options, boolean byteAligned)
CCITTFaxDecoderStream(InputStream stream, int columns, int type, long options)	Creates a CCITTFaxDecoderStream.
CCITTFaxDecoderStream(InputStream stream, int columns, int type, long options, boolean byteAligned)	Creates a CCITTFaxDecoderStream.

Method Summary

Modifier and Type	Method	Description
private void	decode1D()
private void	decode2D()
private void	decodeRow()
private void	decodeRowType2()
private void	decodeRowType4()
private void	decodeRowType6()
private int	decodeRun(CCITTFaxDecoderStream.Tree tree)
private void	fetch()
(package private) static int	findCompressionType(int encodedType, InputStream stream)
private int	getNextChangingElement(int a0, boolean white)
boolean	markSupported()
int	read()
int	read(byte[] b, int off, int len)
private boolean	readBit()
void	reset()
private void	resetBuffer()
long	skip(long n)

Methods inherited from class FilterInputStream

available, close, mark, read

Methods inherited from class InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class Object

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

Field Details

columns

private final int columns

rowsLeft

private int rowsLeft

decodedRow

private final byte[] decodedRow

optionG32D

private final boolean optionG32D

optionG3Fill

private final boolean optionG3Fill

optionUncompressed

private final boolean optionUncompressed

optionByteAligned

private final boolean optionByteAligned

type

private final int type

decodedLength

private int decodedLength

decodedPos

private int decodedPos

changesReferenceRow

private int[] changesReferenceRow

changesCurrentRow

private int[] changesCurrentRow

changesReferenceRowCount

private int changesReferenceRowCount

changesCurrentRowCount

private int changesCurrentRowCount

lastChangingElement

private int lastChangingElement

buffer

int buffer

bufferPos

int bufferPos

BLACK_CODES

static final short[][] BLACK_CODES

BLACK_RUN_LENGTHS

static final short[][] BLACK_RUN_LENGTHS

WHITE_CODES

public static final short[][] WHITE_CODES

WHITE_RUN_LENGTHS

public static final short[][] WHITE_RUN_LENGTHS

EOL

static final CCITTFaxDecoderStream.Node EOL

FILL

static final CCITTFaxDecoderStream.Node FILL

blackRunTree

static final CCITTFaxDecoderStream.Tree blackRunTree

whiteRunTree

static final CCITTFaxDecoderStream.Tree whiteRunTree

eolOnlyTree

static final CCITTFaxDecoderStream.Tree eolOnlyTree

codeTree

static final CCITTFaxDecoderStream.Tree codeTree

VALUE_EOL

static final int VALUE_EOL

See Also:

• Constant Field Values

VALUE_FILL

static final int VALUE_FILL

See Also:

• Constant Field Values

VALUE_PASSMODE

static final int VALUE_PASSMODE

See Also:

• Constant Field Values

VALUE_HMODE

static final int VALUE_HMODE

See Also:

• Constant Field Values

Constructor Details

CCITTFaxDecoderStream

public CCITTFaxDecoderStream(InputStream stream,
 int columns,
 int type,
 long options)

Creates a CCITTFaxDecoderStream.

Parameters:

stream - the compressed CCITT stream.

columns - the number of columns in the stream.

type - the type of stream, must be one of COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE, COMPRESSION_CCITT_T4 or COMPRESSION_CCITT_T6.

options - CCITT T.4 or T.6 options.

CCITTFaxDecoderStream

public CCITTFaxDecoderStream(InputStream stream,
 int columns,
 int type,
 long options,
 boolean byteAligned)

Creates a CCITTFaxDecoderStream. This constructor may be used for CCITT streams embedded in PDF files, which use EncodedByteAlign.

Parameters:

stream - the compressed CCITT stream.

columns - the number of columns in the stream.

type - the type of stream, must be one of COMPRESSION_CCITT_MODIFIED_HUFFMAN_RLE, COMPRESSION_CCITT_T4 or COMPRESSION_CCITT_T6.

options - CCITT T.4 or T.6 options.

byteAligned - enable byte alignment used in PDF files (EncodedByteAlign).

CCITTFaxDecoderStream

CCITTFaxDecoderStream(InputStream stream,
 int columns,
 int rows,
 int type,
 long options,
 boolean byteAligned)

Method Details

findCompressionType

static int findCompressionType(int encodedType,
 InputStream stream)
                        throws IOException

Throws:

IOException

fetch

private void fetch()
            throws IOException

Throws:

IOException

decode1D

private void decode1D()
               throws IOException

Throws:

IOException

decode2D

private void decode2D()
               throws IOException

Throws:

IOException

getNextChangingElement

private int getNextChangingElement(int a0,
 boolean white)

decodeRowType2

private void decodeRowType2()
                     throws IOException

Throws:

IOException

decodeRowType4

private void decodeRowType4()
                     throws IOException

Throws:

IOException

decodeRowType6

private void decodeRowType6()
                     throws IOException

Throws:

IOException

decodeRow

private void decodeRow()
                throws IOException

Throws:

IOException

decodeRun

private int decodeRun(CCITTFaxDecoderStream.Tree tree)
               throws IOException

Throws:

IOException

resetBuffer

private void resetBuffer()
                  throws IOException

Throws:

IOException

readBit

private boolean readBit()
                 throws IOException

Throws:

IOException

read

public int read()
         throws IOException

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(byte[] b,
 int off,
 int len)
         throws IOException

Overrides:

read in class FilterInputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class FilterInputStream

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class FilterInputStream

reset

public void reset()
           throws IOException

Overrides:

reset in class FilterInputStream

Throws:

IOException