Some time vcard may have 'ENCODING=QUOTED-PRINTABLE:' and lines look like

LABEL;TYPE=WORK;ENCODING=QUOTED-PRINTABLE:123 Privet Drive SE=0D=0A=
City Province ZIP=0D=0A=
Country=0D=0A=

module Vpim
  def self.unfold(card)
    unfolded = []
    card.each do |line|
      line.chomp!
      # If it's a continuation line, add it to the last.
      # If it's an empty line, drop it from the input.
      if( line =~ /^[ \t]/ )
        unfolded[-1] << line[1, line.size-1]
      elsif (unfolded.last && unfolded.last =~ /;ENCODING=QUOTED-PRINTABLE:.*?=0D=0A=$/)
        unfolded.last << line
      elsif( line =~ /^$/ )
      else
        unfolded << line
      end
    end
    unfolded
  end
end