Package com.ribs.pdf

Class RBCodecCCITTFaxDecode

java.lang.Object

com.ribs.pdf.RBCodec

com.ribs.pdf.RBCodecCCITTFaxDecode

public class RBCodecCCITTFaxDecode
extends RBCodec

Field Summary

Fields

Modifier and Type	Field	Description
static final int	EndOfTheLine
static final int	Horizontal
static final int	PassMode
static final int	UncompressedMode
static final int	Vertical0
static final int	VerticalLeft1
static final int	VerticalLeft2
static final int	VerticalLeft3
static final int	VerticalRight1
static final int	VerticalRight2
static final int	VerticalRight3

Constructor Summary

Constructors

Constructor	Description
RBCodecCCITTFaxDecode(byte[] bits, int offset, int k, int rows, int columns, int numdamagedrows, boolean aligned, boolean eolrequired, boolean eoblockrequired, boolean blackisone)	main constructor

Method Summary

Modifier and Type	Method	Description
void	backup()	Back the stream up to the marked position
void	byteAlignStream()	Skips over any extra padding bits at the end of a byte.
static byte[]	bytesForCCITTFaxDecode(byte[] bytes, int offset, int len, int K, int rows, int columns, boolean byteAligned, boolean eolRequired, boolean eoblockRequired, boolean blackIsOne, int allowedDamagedRows)	convenience method to decode a single image
boolean	decodeScanline1D(byte[] outdata)
boolean	decodeScanline2D(byte[] outdata)	2D decoder.
byte[]	decodeStream()	Decode the entire image
int	getNextCodeword(int[] table)
int	getNextInt(int[] table)	Interprets next n codewords as an integer.
void	locateReferenceMarks(byte[] scanline, int a0, byte a0color, int[] b)
void	mark()	Mark the current point in the bitstream.
void	writeScanline(OutputStream out, byte[] scanline)	Write the decoded scanline to a stream.

Methods inherited from class com.ribs.pdf.RBCodec

bytesForASCII85, bytesForASCIIHex, bytesForASCIIHex

Methods inherited from class java.lang.Object

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

Field Details

EndOfTheLine

public static final int EndOfTheLine

See Also:

• Constant Field Values

PassMode

public static final int PassMode

See Also:

• Constant Field Values

Horizontal

public static final int Horizontal

See Also:

• Constant Field Values

Vertical0

public static final int Vertical0

See Also:

• Constant Field Values

VerticalRight1

public static final int VerticalRight1

See Also:

• Constant Field Values

VerticalRight2

public static final int VerticalRight2

See Also:

• Constant Field Values

VerticalRight3

public static final int VerticalRight3

See Also:

• Constant Field Values

VerticalLeft1

public static final int VerticalLeft1

See Also:

• Constant Field Values

VerticalLeft2

public static final int VerticalLeft2

See Also:

• Constant Field Values

VerticalLeft3

public static final int VerticalLeft3

See Also:

• Constant Field Values

UncompressedMode

public static final int UncompressedMode

See Also:

• Constant Field Values

Constructor Details

RBCodecCCITTFaxDecode

public RBCodecCCITTFaxDecode(byte[] bits,
 int offset,
 int k,
 int rows,
 int columns,
 int numdamagedrows,
 boolean aligned,
 boolean eolrequired,
 boolean eoblockrequired,
 boolean blackisone)

main constructor

Method Details

bytesForCCITTFaxDecode

public static byte[] bytesForCCITTFaxDecode(byte[] bytes,
 int offset,
 int len,
 int K,
 int rows,
 int columns,
 boolean byteAligned,
 boolean eolRequired,
 boolean eoblockRequired,
 boolean blackIsOne,
 int allowedDamagedRows)

convenience method to decode a single image

getNextCodeword

public int getNextCodeword(int[] table)

getNextInt

public int getNextInt(int[] table)

Interprets next n codewords as an integer. Rules are: numbers less than 64 are low digits. numbers between 64 and 2559 require one additional low digit. 2560 requires an additional number, containing any number of digits.

byteAlignStream

public void byteAlignStream()

Skips over any extra padding bits at the end of a byte.

mark

public void mark()

Mark the current point in the bitstream. Use backup() to return to this point.

backup

public void backup()

Back the stream up to the marked position

decodeStream

public byte[] decodeStream()

Decode the entire image

decodeScanline1D

public boolean decodeScanline1D(byte[] outdata)

locateReferenceMarks

public void locateReferenceMarks(byte[] scanline,
 int a0,
 byte a0color,
 int[] b)

decodeScanline2D

public boolean decodeScanline2D(byte[] outdata)

2D decoder. outdata is a buffer which the new scanline will be written to. On input, however, outdata should have the bits for the previous scanline. The 2D encoder will include codewords which make reference to the previous scanline. For the very first scaneline, outdata should be initialized to all white.

writeScanline

public void writeScanline(OutputStream out,
 byte[] scanline)
                   throws IOException

Write the decoded scanline to a stream.

Throws:

IOException