edu.harvard.hul.ois.jhove.module.pdf

Class ObjectStream

java.lang.Object

edu.harvard.hul.ois.jhove.module.pdf.ObjectStream

public class ObjectStream
extends Object

This class implements the Object Stream, a new way of storing objects starting in PDF 1.4. An object stream can contain one or more objects, as described in Section 3.4 of the PostScript manual. JHOVE supports only FlateDecode as a filter for cross-reference streams. This is consistent with the implementation limitation described in Appendix H of the PDF manual for Acrobat 6 and earlier.

Author:

Gary McGath

Constructor Summary

Constructors

Constructor and Description
ObjectStream(PdfStream ostrm, RandomAccessFile raf) Constructor.

Method Summary

Modifier and Type	Method and Description
PdfObject	getObject(int objnum) Extracts an object from the stream.
boolean	isValid() Checks the validity of the stream dictionary, and extracts information necessary for subsequent reading.
void	readIndex() Reads the index of the object stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectStream

public ObjectStream(PdfStream ostrm,
                    RandomAccessFile raf)

Constructor.

Method Detail

isValid

public boolean isValid()

Checks the validity of the stream dictionary, and extracts information necessary for subsequent reading.

readIndex

public void readIndex()
               throws PdfException,
                      IOException

Reads the index of the object stream.

Throws:

PdfException

IOException

getObject

public PdfObject getObject(int objnum)
                    throws PdfException

Extracts an object from the stream.

Throws:

PdfException