# File lib/mail/encodings.rb, line 213 def Encodings.b_value_encode(encoded_str, encoding = nil) return encoded_str if encoded_str.to_s.ascii_only? string, encoding = RubyVer.b_value_encode(encoded_str, encoding) map_lines(string) do |str| "=?#{encoding}?B?#{str.chomp}?=" end.join(" ") end