Class TMail::Unquoter < Object

# File rails/actionmailer/lib/action_mailer/vendor/tmail/quoting.rb, line 86
def convert_to(text, to, from)
  return text unless to && from
  text ? Iconv.iconv(to, from, text).first : ""
rescue Iconv::IllegalSequence, Iconv::InvalidEncoding, Errno::EINVAL
  # the 'from' parameter specifies a charset other than what the text
  # actually is...not much we can do in this case but just return the
  # unconverted text.
  #
  # Ditto if either parameter represents an unknown charset, like
  # X-UNKNOWN.
  text
end

# File rails/actionmailer/lib/action_mailer/vendor/tmail/quoting.rb, line 50
def unquote_and_convert_to(text, to_charset, from_charset = "iso-8859-1", preserve_underscores=false)
  return "" if text.nil?
  text.gsub(%r(.*?)(?:(?:=\?(.*?)\?(.)\?(.*?)\?=)|$)/) do
    before = $1
    from_charset = $2
    quoting_method = $3
    text = $4

    before = convert_to(before, to_charset, from_charset) if before.length > 0
    before + case quoting_method
        when "q", "Q" then
          unquote_quoted_printable_and_convert_to(text, to_charset, from_charset, preserve_underscores)
        when "b", "B" then
          unquote_base64_and_convert_to(text, to_charset, from_charset)
        when nil then
          # will be nil at the end of the string, due to the nature of
          # the regex used.
          ""
        else
          raise "unknown quoting method #{quoting_method.inspect}"
      end
  end
end

# File rails/actionmailer/lib/action_mailer/vendor/tmail/quoting.rb, line 80
def unquote_base64_and_convert_to(text, to, from)
  convert_to(Base64.decode(text).first, to, from)
end

# File rails/actionmailer/lib/action_mailer/vendor/tmail/quoting.rb, line 74
def unquote_quoted_printable_and_convert_to(text, to, from, preserve_underscores=false)
  text = text.gsub(%r_/, " ") unless preserve_underscores
  text = text.gsub(%r\r\n|\r/, "\n") # normalize newlines
  convert_to(text.unpack("M*").first, to, from)
end