Package org.apache.pdfbox.filter

Class CCITTFaxDecoderStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.apache.pdfbox.filter.CCITTFaxDecoderStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

final class CCITTFaxDecoderStream
extends java.io.FilterInputStream

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

Version:

$Id: CCITTFaxDecoderStream.java,v 1.0 23.05.12 15:55 haraldk Exp$ Taken from commit 24c6682236e5a02151359486aa4075ddc5ab1534 of 18.08.2018 from twelvemonkeys/imageio/plugins/tiff/CCITTFaxDecoderStream.java Initial changes for PDFBox, discussed in PDFBOX-3338: - removed Validate() usages - catch VALUE_EOL in decode1D()

Nested Class Summary

Nested Classes

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

Field Summary

Fields

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

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
CCITTFaxDecoderStream(java.io.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()
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 java.io.FilterInputStream

available, close, mark, read

Methods inherited from class java.lang.Object

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

Field Detail

columns

private final int columns

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 Detail

CCITTFaxDecoderStream

CCITTFaxDecoderStream(java.io.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).

Method Detail

fetch

private void fetch()
            throws java.io.IOException

Throws:

java.io.IOException

decode1D

private void decode1D()
               throws java.io.IOException

Throws:

java.io.IOException

decode2D

private void decode2D()
               throws java.io.IOException

Throws:

java.io.IOException

getNextChangingElement

private int getNextChangingElement(int a0,
                                   boolean white)

decodeRowType2

private void decodeRowType2()
                     throws java.io.IOException

Throws:

java.io.IOException

decodeRowType4

private void decodeRowType4()
                     throws java.io.IOException

Throws:

java.io.IOException

decodeRowType6

private void decodeRowType6()
                     throws java.io.IOException

Throws:

java.io.IOException

decodeRow

private void decodeRow()
                throws java.io.IOException

Throws:

java.io.IOException

decodeRun

private int decodeRun(CCITTFaxDecoderStream.Tree tree)
               throws java.io.IOException

Throws:

java.io.IOException

resetBuffer

private void resetBuffer()

readBit

private boolean readBit()
                 throws java.io.IOException

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Overrides:

read in class java.io.FilterInputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.FilterInputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.FilterInputStream

Throws:

java.io.IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.FilterInputStream

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class java.io.FilterInputStream

Throws:

java.io.IOException