PVRTPrint3Ddat font textures

Hi, I want to know what format uses this PVRTPrint3Ddat.cpp… as far as I know are
bitmaps (unsigned char) of 255x255, but what format are used?  how can I make
this kind of data. I have seen font textures but are always different, the number of
characters per “row”, all this, how can be generated? or how can I replace that reading
I don’t know, a .fon file and map to a font textures?