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From "Jeremias Maerki (JIRA)" <j...@apache.org>
Subject [jira] [Created] (XGC-85) JPEGFile fails to handle the records boundaries of some problematic JPEG files
Date Tue, 03 Sep 2013 09:43:51 GMT
Jeremias Maerki created XGC-85:
----------------------------------

             Summary: JPEGFile fails to handle the records boundaries of some problematic
JPEG files
                 Key: XGC-85
                 URL: https://issues.apache.org/jira/browse/XGC-85
             Project: XMLGraphicsCommons
          Issue Type: Bug
    Affects Versions: 1.4
            Reporter: Jeremias Maerki
            Assignee: Jeremias Maerki


Unfortunately, I cannot share the two JPEG images that trigger this bug report but JPEGFile
from the image loaded framework is too strict about the record structure for some JPEGs. Two
cases:

1. One JPEG simply has multiple 0xFF pad bytes before the actual record marker. These are
legal and just need to be skipped.

2. I got a JPEG file that has an XMP packet embedded. Its record length shows the actual number
of the bytes for the packet but that doesn't match the number of bytes until the start of
the next record. The only thing that can be done here is to continue reading until the first
0xFF record marker which is not perfect but much better than to fail immediately with an IOException
as happens now ("Stream not positioned at a marker segment header").

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