Author: Andreas Schneider


socket_wrapper 1.3.0 and fd-passing

A new version of socket_wrapper has just been released. In short, socket_wrapper is a library passing all socket communications through unix sockets. It aims to help client/server software development teams willing to gain full functional test coverage. It makes possible to run several instances of the full software stack on the same machine and perform locally functional testing of complex network configurations. New in version...


OpenStreetMap for Garmin Fenix

I’ve recently bought a Garmin Fenix Multisport Smartwatch. The watch offers support for navigation and maps. By default it came with some topo maps for Europe. However I wanted to use more detailed maps from OpenStreetMap. After some search I’ve discovered the wonderful Freizeitkarte project, which is a project to offer maps for Garmin devices. The default maps work OKish on the device. However as...


AVIF (12/10/8-bit) image support for darktable

As I’m an amateur photographer, I’m using Open Source tools for developing my images. The software I use is called darktable. I think it is the best tool out there for editing RAW images. From time to time I contributed small code changes to darktable, mostly bug fixes. Now I nearly finished my first feature for darktable, support for the AVIF image format. For implementing...


Samba and GnuTLS

TL;DR SMB3 file transfer with encryption will be 4-6 times faster with Samba 4.12 Samba is getting out of the crypto business GnuTLS >= 3.4.7 required FIPS compliance ahead Introduction More or less since the beginning of Samba, it implemented the cryptography it needed to talk to Windows on its own. One reason is that Windows didn’t follow the standards or used ciphers nobody else...


cmocka version 1.1.2 released

I’m happy to announce version 1.1.2 of cmocka, a unit testing framework for C with mocking support. ChangeLog Added function to filter tests (cmocka_set_test_filter) Added new mocking example (uptime) Fixed fixture error reporting Fixed compiler flags detection Some improvement for API documentation


Profiling a camera with darktable-chart

I’ve written an article about “Profiling a camera with darktable-chart” which has been published at The article is about how to get the same color profile of you camera for your raw developing process. If you wonder what darktable is, it is a raw developer software for photographers.


Using AMD Open Source and the amdgpu-pro OpenCL driver for image processing

I have an AMD grahpics card and use the great Open Source driver which comes with my Linux distribution. However for image processing I want the OpenCL support of my graphics card. Currently that’s only provided by the amdgpu-pro driver. However it is possible to just extract the files needed for OpenCL and use them. Here is how to do this: Go to Select...


Samba 4.7.0 (Samba AD for the Enterprise)

Enterprise distributions like Red Hat or SUSE are required to ship with MIT Kerberos. The reason is that several institutions or governments have a hard requirement for a special Kerberos implementation. It is the reason why the distributions by these vendors (Fedora, RHEL, openSUSE, SLES) only package Samba FS and not the AD component. To get Samba AD into RHEL some day it was clear,...


Microsoft Catalog Files and Digital Signatures decoded

TL;DR: Parse and print .cat files: parsemscat Introduction Günther Deschner and myself are looking into the new Microsoft Printing Protocol [MS-PAR]. Printing always means you have to deal with drivers. Microsoft package-aware v3 print drivers and v4 print drivers contain Microsoft Catalog files. A Catalog file (.cat) is a digitally-signed file. To be more precise it is a PKCS7 certificate with embedded data. Before I...


A new cmocka release version 1.1.0

It took more than a year but finally Jakub and I released a new version of cmocka today. If you don’t know it yet, cmocka is a unit testing framework for C with support for mock objects! We set the version number to 1.1.0 because we have some new features: Support to catch multiple exceptions Support to verify call ordering (for mocking) Support to pass...