How to Parse Figlet Font File .FLF

Hey, i'm interested in writing a pure Ruby implementation of filglet for fun. Do you have any specs for the figlet font files .FLF ? If not how did you figure out how to parse them? Did you just look at another project? If so what project?

The issue concerns parsing Figlet .FLF font files and asks for a specification or an existing project to study. No files, tests, or entry points are named, so begin by locating any font-parsing code or references in the repository. Done would require a concrete documented parsing reference or implementation scope, which this issue does not define.

Written by the indexing model from the issue text.