If you know the protocol and the Device Code, you can generate a set of functions using MakeHex and NEC1.irp source file by editing the Device and supplying a decimal number. For example C2 (Hexadecimal) = 194 (decimal). You will want functions 0 to 255.
To get a better understanding of this IR protocol and how you might go about using MakeHex to generate a full set of codes for you, you can review the document in the Classic Pronto Files Section under User Documentation. The doc you want is entitles "Pronto Hex IR Format" by Mr. Barry Gordon.