drawing a Barcode without a Barcode font

[Matthias Rebbe]

Hi,

at the moment i am using a special barcode font “2of5interleaved” to draw/create a Code25/2of5interleaved  barcode. 
The code itself is calcualted by script and then displayed using that barcode font

The font only has 4 characters  2 black bars (1one them is twice the width of the other) and 2 blank bars(also 1 twice the width of the other)
When printed, the smaller bars should have a width of at least  0,5mm  and the wider one at least 1mm. 

How would i create the bars? Should i use vertical lines or SVGs?
Did anyone have done something similar already?

Regards,
Matthias