Those images match the signature of a central directory.
unzip -t 01-0557-3.jpg
> warning [01-0557-3.jpg]: zipfile claims to be last disk of a multi-part
> archive;
> attempting to process anyway, assuming all parts have been concatenated
> together in order. Expect "errors" and warnings...true multi-part support
> doesn't exist yet (coming soon).
> error [01-0557-3.jpg]: missing 1852006951 bytes in zipfile
> (attempting to process anyway)
> error [01-0557-3.jpg]: attempt to seek before beginning of zipfile
> (please check that you have transferred or created the zipfile in the
> appropriate BINARY mode and that you have compiled UnZip properly)
unzip -t 05-0995-2.jpg
> warning [05-0995-2.jpg]: zipfile claims to be last disk of a multi-part
> archive;
> attempting to process anyway, assuming all parts have been concatenated
> together in order. Expect "errors" and warnings...true multi-part support
> doesn't exist yet (coming soon).
> error [05-0995-2.jpg]: missing 1689894850 bytes in zipfile
> (attempting to process anyway)
> error [05-0995-2.jpg]: attempt to seek before beginning of zipfile
> (please check that you have transferred or created the zipfile in the
> appropriate BINARY mode and that you have compiled UnZip properly)
Whereas with a normal file:
unzip -t 01-0557-2.jpg
> Archive: 01-0557-2.jpg
> End-of-central-directory signature not found. Either this file is not
> a zipfile, (...)
01-0557-3.jpg contains "50 4B 05 06" at offset 0x4E24B and 05-0995-2.jpg
at 0x309DE. Since they're just 4 bytes at an arbitrary offset amongst
"random" data, it's apparently a statistical false positive.
In fact, the more throughly ZipDirectoryReader detects it as 'zip-bad',
'trailing bytes after the end of the file comment'.
Maybe we should strength the checks at MimeMagic.php
What were you changing in the db? I don't get that "magic change back"
that you report. Perhaps it was metadata update was triggering it.
Setting these values you should be safe:
> img_name img_size img_width img_height img_metadata
> img_bits img_media_type img_major_mime img_minor_mime img_sha1
> 01-0557-3.jpg 377382 599 800
> a:1:{s:22:"MEDIAWIKI_EXIF_VERSION";i:2;} 8 BITMAP image jpeg
> 1fyq01rqsw47yhvl4sqg66gr4d60j0f
> 05-0995-2.jpg 220187 800 565
> a:1:{s:22:"MEDIAWIKI_EXIF_VERSION";i:2;} 8 BITMAP image jpeg
> ghuv3z91zq81vub5v8zj9tmjziojzrh
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