com.itextpdf.text.pdf.codec.JBIG2Image Maven / Gradle / Ivy
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*
* This file is part of the iText (R) project.
Copyright (c) 1998-2020 iText Group NV
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package com.itextpdf.text.pdf.codec;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Image;
import com.itextpdf.text.ImgJBIG2;
import com.itextpdf.text.pdf.RandomAccessFileOrArray;
import com.itextpdf.text.error_messages.MessageLocalization;
/**
* Support for JBIG2 Images.
* This class assumes that we are always embedding into a pdf.
*
* @since 2.1.5
*/
public class JBIG2Image {
/**
* Gets a byte array that can be used as a /JBIG2Globals,
* or null if not applicable to the given jbig2.
* @param ra an random access file or array
* @return a byte array
*/
public static byte[] getGlobalSegment(RandomAccessFileOrArray ra ) {
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
return sr.getGlobal(true);
} catch (Exception e) {
return null;
}
}
/**
* returns an Image representing the given page.
* @param ra the file or array containing the image
* @param page the page number of the image
* @return an Image object
*/
public static Image getJbig2Image(RandomAccessFileOrArray ra, int page) {
if (page < 1)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.page.number.must.be.gt.eq.1"));
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
JBIG2SegmentReader.JBIG2Page p = sr.getPage(page);
Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.getData(true), sr.getGlobal(true));
return img;
} catch (Exception e) {
throw new ExceptionConverter(e);
}
}
/***
* Gets the number of pages in a JBIG2 image.
* @param ra a random acces file array containing a JBIG2 image
* @return the number of pages
*/
public static int getNumberOfPages(RandomAccessFileOrArray ra) {
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
return sr.numberOfPages();
} catch (Exception e) {
throw new ExceptionConverter(e);
}
}
}