Module: Rfc2047

Defined in:
lib/whisper/rfc2047.rb

Constant Summary collapse

WORD =

:nodoc: ‘stupid ruby-mode

%r{=\?([!\#$%&'*+-/0-9A-Z\\^\`a-z{|}~]+)\?([BbQq])\?([!->@-~]+)\?=}
WORDSEQ = 
%r{(#{WORD.source})\s+(?=#{WORD.source})}

Class Method Summary collapse

Class Method Details

.decode_to(target, from) ⇒ Object

Decodes a string, from, containing RFC 2047 encoded words into a target character set, target. See iconv_open(3) for information on the supported target encodings. If one of the encoded words cannot be converted to the target encoding, it is left in its encoded form.



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# File 'lib/whisper/rfc2047.rb', line 50

def Rfc2047.decode_to(target, from)
  from = from.gsub(WORDSEQ, '\1')
  out = from.gsub(WORD) do |word|
    charset, encoding, text = $1, $2, $3

    # B64 or QP decode, as necessary:
    case encoding
      when 'b', 'B'
        text = text.unpack('m*')[0]

      when 'q', 'Q'
        # RFC 2047 has a variant of quoted printable where a ' ' character
        # can be represented as an '_', rather than =32, so convert
        # any of these that we find before doing the QP decoding.
        text = text.tr("_", " ")
        text = text.unpack('M*')[0]

      # Don't need an else, because no other values can be matched in a
      # WORD.
    end

    begin
      Iconv.easy_decode target, charset, text
    rescue Iconv::InvalidCharacter => e
      puts "ICONV ERROR: #{e.message}"
      text
    end
  end
end

.is_encoded?(s) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/whisper/rfc2047.rb', line 44

def Rfc2047.is_encoded? s; s =~ WORD end