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https://issues.apache.org/jira/browse/TIKA-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18126952#comment-18126952
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Kyubin Park commented on TIKA-4394:
-----------------------------------
Hi, my name is Kyubin Park. I'm part of a five-student group at the Australian
National University considering contributing to this issue, subject to tutor
approval. Is anyone currently working on it, and would a focused fix with
regression tests be welcome? Any guidance on the intended scope would be
appreciated.
> DXF files with a comment in the first two lines are sometimes detected as
> text/plain
> ------------------------------------------------------------------------------------
>
> Key: TIKA-4394
> URL: https://issues.apache.org/jira/browse/TIKA-4394
> Project: Tika
> Issue Type: Bug
> Affects Versions: 2.9.3, 3.1.0
> Reporter: Sandro Lackner
> Priority: Major
> Attachments: testDXF_long_top_comment-1.dxf, testDXF_no_comment.dxf,
> testDXF_original_comment.dxf, testDXF_short_top_comment.dxf,
> testDXF_shorter_top_comment.dxf
>
>
> When working with DXF files i realized that Tika fails to detect the correct
> MIME type for some of them. Instead of "image/vnd.dxf;format=ascii" Tika
> detects them as "text/plain".
> After some analysis I found out that longer comments in the beginning of the
> DXF files lead to this behaviour. Attached you'll find my test files from
> which only the "shorter" and "no_comment" ones are detected correctly.
> The "original" DXF file contains the comment which lead to this finding in
> the first place. We got it from a customer who uses the GEONIS framework for
> DXF file creation, which is a ESRI ArcGIS-Desktop extension. It seems to use
> the netDXF framework for creation, which writes this comment in the first
> line.
> {noformat}
> Dxf file generated by netDxf https://netdxf.codeplex.com, Copyright(C)
> 2009-2016 Daniel Carvajal, Licensed under LGPL
> {noformat}
> Looking through the Tika GitHub I realized that the tika-mimetypes.xml
> contains a regular expression in the magic match for the mime type
> "image/vnd.dxf;format=ascii" that limits the length of a comment at the
> beginning of the file to 64 characters.
> This regex was added for TIKA-3550 with the following
> [commit|https://github.com/apache/tika/commit/e9f36cb7425f25a768eb58936505277ccbecfedf].
> In my opinion the limit of 64 characters should be removed and replaced by a
> more fitting regular expression for ascii dxf file detection.
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