ˈɛkszˈɛŋkoʊd ɹᵻpˈiːɾᵻdli tˈeɪks ɪn ɡɹˈuːps ʌv θɹˈiː bˈaɪts, ˈædɪŋ tɹˈeɪlɪŋ zˈiəɹoʊz ɪf ðɛɹˌɑːɹ fjˈuːɚ ðɐn θɹˈiː bˈaɪts lˈɛft.
xxencode repeatedly takes in groups of three bytes, adding trailing zeroes if there are fewer than three bytes left.