Example usage for com.itextpdf.text.pdf PdfIndirectReference getNumber

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf PdfIndirectReference getNumber.

Prototype

public int getNumber() 

Source Link

Document

Returns the number of the object.

Usage

From source file:cz.muni.pdfjbim.PdfImageExtractor.java

License:Apache License

/**
 * Extracts JBIG2Images from Input stream even if they are stored together with global dictionary in separate PDF object
 * doesn't work yet, its in development stage
 * @param is/*from   www .j  a  va 2s  . co m*/
 * @throws PdfRecompressionException 
 * @deprecated 
 */
public void extractJbig2Images(InputStream is) throws PdfRecompressionException {
    if (is == null) {
        throw new IllegalArgumentException("InputStream not given");
    }

    PdfReader pdfReader = null;
    try {
        pdfReader = new PdfReader(is);

        for (int i = 0; i <= pdfReader.getNumberOfPages(); i++) {
            PdfDictionary d = pdfReader.getPageN(i);
            PdfIndirectReference ir = d.getAsIndirectObject(PdfName.CONTENTS);
            PdfObject o = pdfReader.getPdfObject(ir.getNumber());
            PdfStream stream = (PdfStream) o;
            PdfObject pdfsubtype = stream.get(PdfName.SUBTYPE);
            if (pdfsubtype != null && pdfsubtype.toString().equals(PdfName.IMAGE.toString())) {
                byte[] img = PdfReader.getStreamBytesRaw((PRStream) stream);
                OutputStream out = new FileOutputStream(
                        new File("pdfRecompressor", String.format("%1$05d", i) + ".jpg"));
                out.write(img);
                out.flush();
                out.close();
            }

        }

    } catch (IOException ex) {
        log.error("IOException caught while trying to extract jbig2 images from PDF", ex);
        throw new PdfRecompressionException("IOException caught while trying to extract jbig2 images from PDF",
                ex);
    } finally {
        if (pdfReader != null) {
            pdfReader.close();
        }
    }

}

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