class Mail::Encodings::QuotedPrintable

def self.can_encode?(str) 

def self.can_encode?(str)
  EightBit.can_encode? str
end

def self.cost(str) 

def self.cost(str)
  # These bytes probably do not need encoding
  c = str.count("\x9\xA\xD\x20-\x3C\x3E-\x7E")
  # Everything else turns into =XX where XX is a 
  # two digit hex number (taking 3 bytes)
  total = (str.bytesize - c)*3 + c
  total.to_f/str.bytesize
end

def self.decode(str)

that were incorrectly encoded as hex instead of literal CRLF.
Decode the string from Quoted-Printable. Cope with hard line breaks 
def self.decode(str)
  str.gsub(/(?:=0D=0A|=0D|=0A)\r\n/, "\r\n").unpack("M*").first.to_lf
end

def self.encode(str) 

def self.encode(str)
  [str.to_lf].pack("M").to_crlf
end