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https://issues.apache.org/jira/browse/TIKA-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18138237#comment-18138237
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ASF GitHub Bot commented on TIKA-5036:
--------------------------------------
dschmidt opened a new pull request, #3539:
URL: https://github.com/apache/tika/pull/3539
[TIKA-5036](https://issues.apache.org/jira/browse/TIKA-5036), Blender part
(SketchUp follows separately).
Blender stores a preview of the scene in every `.blend` file it saves with a
UI: a 128 px RGBA bitmap in the `TEST` block, right after `REND`.
`BlenderParser` (cad module) emits it as a PNG `THUMBNAIL`. Both block header
layouts are read, the old one and the 64-bit one of Blender 5.0.
`application/x-blender` is new, with the globs and magic of
shared-mime-info. Blender can save gzip- (up to 2.9x) or zstd-compressed (3.0
and later) files, which their magic would make `application/gzip` or
`application/zstd`. `BlenderDetector` looks for `BLENDER` behind the
compression, as `GZipSpecializationDetector` does for WARC. zstd needs zstd-jni
on the classpath, optional as it is for `CompressorParser`; without it a
zstd-compressed file stays `application/zstd`, and a test hides zstd-jni from a
class loader to cover that.
Checked against 41 real files from public repositories: 19 from Blender 2.77
to 4.2 (plain, gzip, zstd) and 22 from Blender 5.0 to 5.2. All are detected
with and without a file name, and every preview they hold comes out upright.
Files saved without a UI (`blender -b`) have no preview; files saved by scripts
keep the one they were opened with.
> Blender and SketchUp: emit the embedded preview
> -----------------------------------------------
>
> Key: TIKA-5036
> URL: https://issues.apache.org/jira/browse/TIKA-5036
> Project: Tika
> Issue Type: Improvement
> Components: mime, parser
> Reporter: Dominik Schmidt
> Priority: Major
>
> {{.blend}} files carry a {{TEST}} block with an RGBA preview, {{.skp}} files
> an embedded PNG. Emitting it as THUMBNAIL gives both a preview.
> Both need media types first, see TIKA-3992. Note that {{.skp}} is registered
> as {{application/vnd.koan}} (SSEYO Koan), which SketchUp files collide with.
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