This is a C# project I worked on with my late Godfather, James "Walter" Boyle. He wrote some sophisticated software to handle analogue tachographs and report on working hours, compliance to speed limits, etc, and needed to add support for the digital tachograph system that was introduced in around 2002 (EEC 3821/85).

Usage is quite simple. There is a main class DataFileReader and two subclasses: VehicleUnitDataFile and DriverCardDataFile. You can create an instance of one of the sublasses using the following methods:

DataFile vudf=VehicleUnitDataFile.Create();
DataFile dcdf=DriverCardDataFile.Create();

Once you have a reader instance you can give it a binary file to read and an XML Writer:

vudf.Process("file.ddd", writer);

Most of the sections/features of both data file formats are catered for. It's possible to modify the data file formats using DriverCardData.config and VehicleUnitData.config. These are two XML files defining the structure of the data with features specific to the standard (such as cyclic buffer support).

The standard is not particularly well written and it took quite a bit of work to decipher it. This project encapsulates that learning in a reasonably succint form, mainly in the XML config files. Some code comments refer to pages in the specification Contribution guidelines for this project which is available in this repository for convenience.

It's amusing that the authors of the standard went to great pains to fit the data in the space available on the cards of the time... a very cheap USB stick would now hold a lifetime's worth of driver data!

The code does not validate the digital signatures in a file, so it's possible someone could provide a fraudulent data file and we would not detect it. If this is important to you, you are probably stuck with using the available commercial software to process your data files.

I am distributing the code in the hope that someone finds it useful but without any warranty of any kind.

If you have issues or questions I may be able to help - time permitting - so please raise an issue. Even better, create a pull request!

Copyright (C) 2014-2017 Alfie Kirkpatrick

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.