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https://issues.apache.org/jira/browse/PDFBOX-574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andreas Lehmkühler reassigned PDFBOX-574:
-----------------------------------------
Assignee: Andreas Lehmkühler
> PDFBox image extraction fails with an ArrayOutOfBoundsException in
> PDPixelMap.getRGBImage()
> -------------------------------------------------------------------------------------------
>
> Key: PDFBOX-574
> URL: https://issues.apache.org/jira/browse/PDFBOX-574
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 0.8.0-incubator
> Environment: Java
> Reporter: Ian Kaplan
> Assignee: Andreas Lehmkühler
> Attachments: omv_overview.pdf
>
>
> The project that I'm working on has been using PDFBox for both text
> extraction and image extraction from PDF documents. We wrote a class,
> PDFImageStripper, which extends PDFStreamEngine:
> public class PDFImageStripper extends PDFStreamEngine
> public List<ExtractedImage> getImages(PDDocument document, String
> documentFilename, File targetDirectory) throws IOException {
> resetEngine();
>
> this.document = document;
> this.documentFilename = documentFilename;
> this.targetDirectory = targetDirectory;
>
> currentImageNumber = 1;
>
> images.clear();
> writeImages();
> return images;
> }
> private void writeImages() throws IOException {
> List<PDPage> pages = (List<PDPage>)
> document.getDocumentCatalog().getAllPages();
> for (PDPage page : pages) {
> if (page != null) {
> processStream(page, page.findResources(),
> page.getContents().getStream());
> }
> }
> }
> The call chain is shown below:
> None.decode(byte[], byte[]) line: 57
> PDPixelMap.getRGBImage() line: 182
> PDPixelMap.write2OutputStream(OutputStream) line: 209
> PDPixelMap(PDXObjectImage).write2file(File) line: 142
> PDFImageStripper.saveImage(PDXObjectImage, String, File) line: 208
> PDFImageStripper.processOperator(PDFOperator, List) line: 155
> PDFImageStripper(PDFStreamEngine).processSubStream(PDPage, PDResources,
> COSStream) line: 229
> PDFImageStripper(PDFStreamEngine).processStream(PDPage, PDResources,
> COSStream) line: 188
> PDFImageStripper.writeImages() line: 113
> There is an ArrayOutOfBoundsException in the decode method. The decode
> method is nothing more than a wrapper for a call to System.arraycopy():
> public void decode(byte[] src, byte[] dest)
> {
> System.arraycopy(src,0,dest,0,src.length);
> }
> The problem is, the source array is larger than the destination array. This
> is show (from the Eclipse debugger) below:
> src byte[455112] (id=171)
> dest byte[435456] (id=175)
> The code that seems to be causing the problem is shown below. The branch
> that this bug shows up on is the LZW_DECODE branch. Note that in the other
> code branch, the code makes sure that there is no size problem.
> if( predictor < 10 ||
> filters == null || !(filters.contains(
> COSName.LZW_DECODE.getName()) ||
> filters.contains( COSName.FLATE_DECODE.getName()) ) )
> {
> PredictorAlgorithm filter =
> PredictorAlgorithm.getFilter(predictor);
> filter.setWidth(width);
> filter.setHeight(height);
> filter.setBpp((bpc * 3) / 8);
> filter.decode(array, bufferData);
> }
> else
> {
> System.arraycopy( array, 0,bufferData, 0,
> (array.length<bufferData.length?array.length:
> bufferData.length) );
> }
> One fix may be to simply change the code as follows (again, recall that the
> "decode" method is nothing but a wrapper for System.arraycopy()):
> if( predictor < 10 ||
> filters == null || !(filters.contains(
> COSName.LZW_DECODE.getName()) ||
> filters.contains( COSName.FLATE_DECODE.getName()) ) )
> {
> PredictorAlgorithm filter =
> PredictorAlgorithm.getFilter(predictor);
> filter.setWidth(width);
> filter.setHeight(height);
> filter.setBpp((bpc * 3) / 8);
> }
> System.arraycopy( array, 0,bufferData, 0,
> (array.length<bufferData.length?array.length:
> bufferData.length) );
> If Jira allows me to attach a file that causes this problem I will do so.
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