Class JBIG2SegmentReader

java.lang.Object

com.aowagie.text.pdf.codec.JBIG2SegmentReader

class JBIG2SegmentReader
extends Object

Class to read a JBIG2 file at a basic level: understand all the segments, understand what segments belong to which pages, how many pages there are, what the width and height of each page is, and global segments if there are any. Or: the minimum required to be able to take a normal sequential or random-access organized file, and be able to embed JBIG2 pages as images in a PDF. TODO: the indeterminate-segment-size value of dataLength, else?

Since:

2.1.5

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	JBIG2SegmentReader.JBIG2Page	Inner class that holds information about a JBIG2 page.
private static class	JBIG2SegmentReader.JBIG2Segment	Inner class that holds information about a JBIG2 segment.

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	END_OF_FILE
private static final int	END_OF_PAGE
private final SortedSet	globals
private int	number_of_pages
private boolean	number_of_pages_known
private static final int	PAGE_INFORMATION
private final SortedMap	pages
private final RandomAccessFileOrArray	ra
private boolean	read
private final SortedMap	segments
private boolean	sequential

Constructor Summary

Constructors

Constructor	Description
JBIG2SegmentReader(RandomAccessFileOrArray ra)

Method Summary

Modifier and Type	Method	Description
private static byte[]	copyByteArray(byte[] b)
(package private) byte[]	getGlobal(boolean for_embedding)
(package private) JBIG2SegmentReader.JBIG2Page	getPage(int page)
private int	numberOfPages()
void	read()
private void	readFileHeader()
private JBIG2SegmentReader.JBIG2Segment	readHeader()
private void	readSegment(JBIG2SegmentReader.JBIG2Segment s)
String	toString()

Methods inherited from class Object

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

Field Details

PAGE_INFORMATION

private static final int PAGE_INFORMATION

See Also:

• Constant Field Values

END_OF_PAGE

private static final int END_OF_PAGE

See Also:

• Constant Field Values

END_OF_FILE

private static final int END_OF_FILE

See Also:

• Constant Field Values

segments

private final SortedMap segments

pages

private final SortedMap pages

globals

private final SortedSet globals

ra

private final RandomAccessFileOrArray ra

sequential

private boolean sequential

number_of_pages_known

private boolean number_of_pages_known

number_of_pages

private int number_of_pages

read

private boolean read

Constructor Details

JBIG2SegmentReader

public JBIG2SegmentReader(RandomAccessFileOrArray ra)
                   throws IOException

Throws:

IOException

Method Details

copyByteArray

private static byte[] copyByteArray(byte[] b)

read

public void read()
          throws IOException

Throws:

IOException

readSegment

private void readSegment(JBIG2SegmentReader.JBIG2Segment s)
                  throws IOException

Throws:

IOException

readHeader

private JBIG2SegmentReader.JBIG2Segment readHeader()
                                            throws IOException

Throws:

IOException

readFileHeader

private void readFileHeader()
                     throws IOException

Throws:

IOException

numberOfPages

private int numberOfPages()

getPage

JBIG2SegmentReader.JBIG2Page getPage(int page)

getGlobal

byte[] getGlobal(boolean for_embedding)

toString

public String toString()

Overrides:

toString in class Object