# File lib/mail/encodings.rb, line 207 def Encodings.b_value_encode(str, encoding = nil) return str if str.to_s.ascii_only? string, encoding = RubyVer.b_value_encode(str, encoding) map_lines(string) do |str| "=?#{encoding}?B?#{str.chomp}?=" end.join(" ") end