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https://issues.apache.org/jira/browse/PDFBOX-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16840356#comment-16840356
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Bhavesh Kharwa commented on PDFBOX-4547:
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Hi,
today i have investigate more on this and found that the above code will no
into infinite loop but it took 45 mins to rendered that image. I have tested
with jdk version 1.8.0_163
After that I have installed jdk version 1.8.0_191 and process the same file. at
that time it took 10 second to process.
> PDFRendtion : Infinite loop
> ---------------------------
>
> Key: PDFBOX-4547
> URL: https://issues.apache.org/jira/browse/PDFBOX-4547
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.15
> Reporter: Bhavesh Kharwa
> Priority: Critical
>
> while processing pdf file for generate rendtion, the following method
> _processStreamOperators_ of *org.apache.pdfbox.contentstream.PDFStreamEngine*
> class goes into infinite loop. I am using library pdfbox-2.0.15
> {code:java}
> private void processStreamOperators(PDContentStream contentStream) throws
> IOException
> {
> List<COSBase> arguments = new ArrayList<COSBase>();
> PDFStreamParser parser = new PDFStreamParser(contentStream);
> Object token = parser.parseNextToken();
> while (token != null)
> {
> if (token instanceof COSObject)
> {
> arguments.add(((COSObject) token).getObject());
> }
> else if (token instanceof Operator)
> {
> processOperator((Operator) token, arguments);
> arguments = new ArrayList<COSBase>();
> }
> else
> {
> arguments.add((COSBase) token);
> }
> token = parser.parseNextToken();
> }
> }
> {code}
> Generate rendition code for pdf as below:
> {code:java}
> try (final PDDocument pdf = PDDocument.load(imageBytes)) {
> if (pdf != null && pdf.getNumberOfPages() > 0) {
> PDFRenderer renderer = new PDFRenderer(pdf);
> BufferedImage image = renderer.renderImage(0, 1);
> final BufferedImage scaledImage;
> if (image.getWidth() > rendition.getWidth()) {
> scaledImage =
> Thumbnails.of(image).width(rendition.getWidth()).asBufferedImage();
> } else {
> scaledImage = image;
> }
> outputBytes =
> ImageUtils.writeBufferedImageToBytes(scaledImage, mimeType);
> }
> }
> {code}
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