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From "Nick Burch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-1039) Raw image file detected as audio/mpeg
Date Mon, 04 Feb 2013 17:06:12 GMT

    [ https://issues.apache.org/jira/browse/TIKA-1039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570390#comment-13570390
] 

Nick Burch commented on TIKA-1039:
----------------------------------

I'm not sure there's much that we can do about this, as the starting "magic" for MP3 files
are a little generic. It's possible we could try to add a second check for another frame header
of a similar type (VBR means the first two frame headers may differ) within a frame's size
distance, but the mime magic checking for that would be pretty icky given the current structure.
http://www.mars.org/pipermail/mad-dev/2002-January/000425.html indicates how many bytes an
audio frame could be (ID3 frames can be much much larger, and one of those could be the first)
                
> Raw image file detected as audio/mpeg
> -------------------------------------
>
>                 Key: TIKA-1039
>                 URL: https://issues.apache.org/jira/browse/TIKA-1039
>             Project: Tika
>          Issue Type: Bug
>          Components: mime
>    Affects Versions: 1.2
>            Reporter: Oliver Boldt
>         Attachments: SimpleTestFile.raw
>
>
> A raw image file that starts with a long sequence of FFFF.... is recognised as audio/mpeg.
> The problem is that the raw file does not have a magic number itself and the FF...-pixeldata
is wrongly interpreted as an mpeg file. The bug seems to be a general problem, because other
image data could be misinterpreted as other magic numbers.

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