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From "Bruno P. Kinoshita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IMAGING-198) Error while parsing JPEG with EXIF metadata with Imaging 1.0 (Sony DSC-R1)
Date Sat, 04 Nov 2017 12:30:00 GMT

    [ https://issues.apache.org/jira/browse/IMAGING-198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238960#comment-16238960
] 

Bruno P. Kinoshita commented on IMAGING-198:
--------------------------------------------

Had some spare time today in a library nearby, and spent the day recapping the JPEG format
(haven't looked at it since uni). Then spent some time in the evening debugging the code.

So far I found `jhead -v 99f.jpg` a helpful command, showing the segments found, and displaying
the metadata hierarchically. The image attached to this issue is a JPEG/EXIF image. It contains
the APP1 marker, which is parsed with Commons Imaging TiffReader.

This reader finds the initial directory, with 16 entries. All parsed successfully.

Then the TiffReader reads another directory. And here's where I will have to continue investigating
it later.

This next directory starts with offset 0, and the ByteSource that it has reference is the
initial ByteSource used for the first directory. This ByteSource has 764 bytes. But this second
directory has 9128 bytes. And hence we have an exception in one of the if's that are used
to prevent array out of bounds issues.

Just need to re-read about the EXIF format, and its directories. See how TIFF differs in regards
to EXIF, directories, ordering. Could be that TIFF expects this second directory, as after
that some code is iterating subdirectories...

> Error while parsing JPEG with EXIF metadata with Imaging 1.0 (Sony DSC-R1)
> --------------------------------------------------------------------------
>
>                 Key: IMAGING-198
>                 URL: https://issues.apache.org/jira/browse/IMAGING-198
>             Project: Commons Imaging
>          Issue Type: Bug
>          Components: Format: JPEG
>    Affects Versions: 1.0
>         Environment: Windows and Java 7u80
>            Reporter: Samuel
>            Assignee: Bruno P. Kinoshita
>            Priority: Major
>              Labels: EXIF, JPEG
>         Attachments: 99f.jpg
>
>
> An example of a JPEG image with EXIF metadata, coming from a Sony DSC-R1 camera, that
will not be parsed with commons-imaging 1.0.
> http://imgur.com/a/fl9D9



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