FONTLIB provides some routines for font format conversions. This is mostly needed in the exports (see Export). For example, in order to include a TrueType font inside a PostScript file, it must be converted into a Type42 font. Similar rules apply to PFB Type1 fonts.
The conversion routines are realized in the font/convert.c source file. The converters are also available as standalone utilities, each with its simple wrapper around the FONTLIB.