Kristian Jörg created PDFBOX-3990:
-------------------------------------
Summary: Rendering will never complete
Key: PDFBOX-3990
URL: https://issues.apache.org/jira/browse/PDFBOX-3990
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.7
Environment: Java 1.8
Reporter: Kristian Jörg
Priority: Critical
Attachments: D90296482_20171102.PDF
I have a PDF file that I am attempting to render with:
{code:java}
PDFRenderer renderer = new PDFRenderer(document);
for (int i = 0; i < 2; i++ ) { // the document is two pages, code simplified
BufferedImage image = renderer.renderImageWithDPI(i, dpi, ImageType.RGB);
}
{code}
However, the code never returns. When I pause execution (in Eclipse) I see that
execution never leaves the decode() method of
org.apache.pdfbox.filter.RunLengthDecodeFilter.
The problem is that the inner loop of while (amountToCopy > 0) in bold below is
never executed because the stream has come to EOF! That means that the int
compressedRead get a negative value and amountToCopy is _*added *_to instead of
being subtracted from.
The loop seems to eventually step out of itself, Probably when the integer
warps around when reaching it's max (?)
The problem is easy to catch if setting a conditional breakpoint on
compressedRead == -1.
I'll include the PDF. The problem arises on page 2.
{code:java}
public DecodeResult decode(InputStream encoded, OutputStream decoded,
COSDictionary parameters, int index)
throws IOException
{
int dupAmount;
byte[] buffer = new byte[128];
while ((dupAmount = encoded.read()) != -1 && dupAmount !=
RUN_LENGTH_EOD)
{
if (dupAmount <= 127)
{
int amountToCopy = dupAmount + 1;
int compressedRead;
* while(amountToCopy > 0)
{
compressedRead = encoded.read(buffer, 0, amountToCopy);
decoded.write(buffer, 0, compressedRead);
amountToCopy -= compressedRead;
}*
}
else
{
int dupByte = encoded.read();
for (int i = 0; i < 257 - dupAmount; i++)
{
decoded.write(dupByte);
}
}
}
return new DecodeResult(parameters);
}
{code}
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