Mark0's Forum
Software => TrID File Identifier => Topic started by: jenderek on March 08, 2023, 02:56:38 PM
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Hello trid users,
some days ago i looked at CD-ROM images to install Linux. On some
distribution like Knoppix using syslinux/isolinux as boot loader i found
graphical image used by loader during boot process. On
KNOPPIX_V9.1DVD-2021-01-25-DE.iso CD-ROM images this is named logo.16 and
found in isolinux sub directory. Such samples can also be found in
syslinux. In package syslinux-6.03.zip her such images are called
syslogo.lss and are located in sample sub directory.
When running TrID command on such examples these are described as "LSS16
SYSLINUX Splash image" by "bitmap-lss16.trid.xml". 2 possible file name
suffix are listed here "(.LSS/16)" (See appended output/trid-v.txt).
For comparison reason i also run file command (newest version 5.44) on such
samples. Here such samples are described as "SYSLINUX' LSS16 image data"
(See appended output/file-5.44.txt). But when running this with --extension
option no suffix is listed here (See appended output/file-ext-5.44.txt). But
when running with -i option a mime type is shown. That is image/x-lss16 (See
appended output/file-i-5.44.txt).
That information can also be found in x-lss16.xml inside the syslinux
package in path like mime/image. This file can be used as fragment for
shared-mime-info database. On my Raspberry Pi there this entry is missing in
mime database.
For comparison reason i also run the file format identification utility
DROID ( See https://sourceforge.net/projects/droid/). This does not
recognize such images.
So i update definition and now show mime type. That is expressed by line
like:
<Mime>image/x-lss16</Mime>
The suffix for such splash images is often lss or some times 16. That is
expressed by line like:
<Ext>LSS/16</Ext>
Unfortunately these 2 suffix are also used by other file types. So i also
found LSS for lynx.lss. That is a configuration file for Lynx text based web
browser. The 16 Suffix is also used for some font samples like hebrew.16.
So an unique mime type is especially needed, when you are interested that
the most best describing system will win.
With the new trid definitions now my syslinux splash images are still
described but now also the right mime type is shown (see appended
output/trid-v-new.txt). TrID definition and output are stored in archive
lss_16.zip.
I hope that my updated XML file can be used in future version of triddefs.
With best wishes
Jörg Jenderek
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Thanks Jörg!