Decode 3d embedded file data

Hi,
is there a way to decode the 3d embedded data to the original source, using python?
I am attaching a minimal pcb file with a 3d file embedded as source.
the data field contains I think a base64 encoded and ZSTD zipped version of the data:

	(embedded_files
		(file
			(name "R_0805_2012Metric.step")
			(type model)
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			)
			(checksum "187B861B0B474345E1BCE9B239E77C44")
		)

I would need to obtain the original ‘step’ file using python (i.e. w/ base64 and zstd code)
minimal-embed-kv9.kicad_pcb (16.6 KB)

I have got some tips here:
https://docs.kicad.org/doxygen/classEMBEDDED__FILES.html#a62801917cd127462b9da71f494198a02

I copied your data section, pasted it into a file and removed the alphabetic stuff before the data so that it starts at | and removed the stuff after the closing |.

Then I fed it into the Linux program base64:

$ base64 -d -i < b64.in > b64.out
$ file b64.out
b64.out: Zstandard compressed data (v0.8+), Dictionary ID: None
$ man -k Zstandard
zstdgrep (1)         - print lines matching a pattern in zstandard-compressed files
zstdless (1)         - view zstandard-compressed files
$ zstdless b64.out
ISO-10303-21;
HEADER;
/* R_0805_2012Metric.step 3D STEP model for use in ECAD systems
 * Copyright (C) 2018, kicad StepUp
 * 
 * This work is licensed under the [Creative Commons CC-BY-SA 4.0 License](https://creativecommons.org/licenses/by-sa/4.0/legalcode), 
 * with the following exception:
 * To the extent that the creation of electronic designs that use 'Licensed Material' can be considered to be 'Adapted Material', 
 * then the copyright holder waives article 3 of the license with respect to these designs and any generated files which use data provided 
 * as part of the 'Licensed Material'.
 * You are free to use the library data in your own projects without the obligation to share your project files under this or any other license agreement.
 * However, if you wish to redistribute these libraries, or parts thereof (including in modified form) as a collection then the exception above does not apply. 
 * Please refer to https://github.com/KiCad/kicad-packages3D/blob/master/LICENSE.md for further clarification of the exception.
 * Disclaimer of Warranties and Limitation of Liability.
 * These libraries are provided in the hope that they will be useful, but are provided without warranty of any kind, express or implied.
 * *USE 3D CAD DATA AT YOUR OWN RISK*
 * *DO NOT RELY UPON ANY INFORMATION FOUND HERE WITHOUT INDEPENDENT VERIFICATION.*
 * 
 */

FILE_DESCRIPTION(
/* description */ ('model of R_0805_2012Metric'),
/* implementation_level */ '2;1');
...

I’m sure you can code up something in Python.

1 Like

thank you very much, this should be more than enough :smiley:

And in case there are lazy people reading this who want to know how easy it is with python but don’t want to do a simple google search…

the b64 part was easy, but the zstd didn’t work on my test, so I posted here.
I’m not at pc atm

@retiredfeline
I solved w/ python base64 and zstandard libs… zstd was not enough…
thanks again for your solution :slight_smile: