[Proj] NADCON

[Patrick van Dijk]

I am wondering how the NAD datum conversion is implemented in Proj.4
>From the NADCON site I have learned there are .laa and .loa ASCII files
with .las  and .los as their binary counterparts.
And the NADCON source code is written in Fortran.

But Proj.4 is using .lla files and the source code is in C.

Have the .lla files been converted from .laa and .loa?
Is the C code a conversion from the Fortran implementation?

Thanks,

Patrick