The Graphical Fragment Assembly (GFA) is a proposed format which allow to describe the product of sequence assembly and is implemented in the RGFA class defined in the rgfa gem. The GFA format is a text format. This gem defines a complementary binary format, BFA. The methods in this class allow to write a BFA file from a RGFA object, and to parse a BFA file into a RGFA object. This also allows the conversion from/to GFA format. This gem depends on the "rgfa" gem.