Module: Rfc2047
- Defined in:
- lib/sup/rfc2047.rb
Overview
$Id: rfc2047.rb,v 1.4 2003/04/18 20:55:56 sam Exp $ MODIFIED slightly by William Morgan
An implementation of RFC 2047 decoding.
This module depends on the iconv library by Nobuyoshi Nakada, which I’ve heard may be distributed as a standard part of Ruby 1.8. Many thanks to him for helping with building and using iconv.
Thanks to “Josef ‘Jupp’ Schugt” <jupp / gmx.de> for pointing out an error with stateful character sets.
Copyright © Sam Roberts <sroberts / uniserve.com> 2004
This file is distributed under the same terms as Ruby.
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
-
.decode_to(target, from) ⇒ Object
Decodes a string,
from
, containing RFC 2047 encoded words into a target character set,target
. - .is_encoded?(s) ⇒ Boolean
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/sup/rfc2047.rb', line 29 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' #puts text text = text.unpack('m*')[0] #puts text.dump 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 text.transcode(target, charset) end end |