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https://issues.apache.org/jira/browse/PDFBOX-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fredrik Kjellberg updated PDFBOX-1582:
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Attachment: TestRandomAccessFileInputStream_diff.txt
> Issues with available() and skip() on RandomAccessFileInputStream
> -----------------------------------------------------------------
>
> Key: PDFBOX-1582
> URL: https://issues.apache.org/jira/browse/PDFBOX-1582
> Project: PDFBox
> Issue Type: Test
> Components: Parsing
> Affects Versions: 1.8.1
> Reporter: Fredrik Kjellberg
> Priority: Minor
> Attachments: TestRandomAccessFileInputStream_diff.txt
>
>
> I'm trying to track down a strange bug when parsing PDF files on the IBM JDK
> that sometimes is giving me stack traces from RandomAccessFile classes. I
> started by writing unit tests for the PDFBox classes to verify their behavior
> and found a few issues. Can someone more familiar with the PDFBox code base
> please check the unit test I wrote and give advise on how it is supposed to
> work? I've added a TODO for each line where I'm in doubt what should be
> returned.
> This unit test is for RandomAccessFileInputStream where I've found a few
> issues. The first is what available() is supposed to return if the input
> stream tries to go beyond the EOF of the underlying file? When reading single
> bytes it count down while still returning -1 and when reading a buffer, it is
> returning what it think is left. The JDK documentation states that
> available() may not return the absolute truth, so perhaps returning what it
> think is left is okay, but it shouldn't count down in single reads beyond
> EOF? Maybe it should be set to zero once a read beyond the EOF is detected?
> Another issue is with skip() where the JDK documentation states that it
> should return the actual number of bytes skipped. When skipping beyond the
> EOF of the file, it does not return the actual number of skipped bytes. Also
> the underlying file is not updated with the new position. Is this correct
> behavior?
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