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https://issues.apache.org/jira/browse/PDFBOX-742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler resolved PDFBOX-742.
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Fix Version/s: 1.2.0
Resolution: Fixed
I've replaced the System.out/err as proposed (there is no patch attached) with
version 954269.
getUnfilteredStream returns the decoded stream of a COSStream as mentioned in
the javadoc description.
> [patch] Please don't print logging statements to System.err
> -----------------------------------------------------------
>
> Key: PDFBOX-742
> URL: https://issues.apache.org/jira/browse/PDFBOX-742
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 1.1.0
> Reporter: Antoni Mylka
> Fix For: 1.2.0
>
>
> There are three org.apache.pdfbox.filter.Filter implementations which are
> unimplemented. These are:
> CCITTFaxDecodeFilter
> DCTFilter
> RunLengthDecodeFilter
> They all contain calls to System.err with messages like
> Warning: DCTFilter.decode is not implemented yet, skipping this stream.
> In my code I iterate over all images in a PDF and try to obtain their raw,
> undecoded content. I use code like this:
> private byte [] getUnDecodedImageBytes(COSStream st) throws IOException {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> IOUtil.writeStream(st.getUnfilteredStream(), baos);
> return baos.toByteArray();
> }
> The getUnfilteredStream() method, when called on JPG embedded images seems to
> try to invoke the DCTFilter. If I have a large ebook file with lots of JPG
> images - this yields LOTS of text to the Standard error output which can't be
> suppressed.
> PDFBox uses commons-logging all over the place. Why not push those warnings
> to the log. They are non-critical. In my particular case when I use the above
> method I get an empty array. If I do, I resort to another method:
> private byte [] getDecodedImageBytes(COSStream st) throws IOException {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> PDXObjectImage ximage = (PDXObjectImage)PDXObject.createXObject( st );
> ximage.write2OutputStream(baos);
> return baos.toByteArray();
> }
> This seems to work, even for those images where getUnfilteredStream returns
> an empty stream.
> I don't quite understand what's the difference, since I would expect a method
> labelled 'getUnfilteredStream' to return the stream as-it-is in the PDF file,
> without using any Filters. Moreover such a failure would imply that the
> library simply cannot process JPG images in PDF files, which is not the case
> because write2OutputStream works OK. So I don't know where the real problem
> lies. Maybe someone with more PDFBox knowledge could take a look.
> Still, my patch only moves those warnings to the log, where I can suppress
> them. This is simple and fixes the immediate problem in my application.
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