#--
# rbmh/header.rb : rbmhshow 0.4.2
#
# Copyright (C) 2004--2005  Merlin Hughes  <ruby AT merlin DOT org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#++
# Header decoding

module RBMH
  class Header
  end

  # http://www.ietf.org/rfc/rfc2047.txt
  # I don't follow the rules for spacing of words
  # and I am slack with [^?] instead of [^ ?] because
  # of some erroneous implementations
  # I just ignore charset for now... assume iso-8859-1
  # TODO: Do this better, use it for all appropriate headers
  def Header.nationalize(value)
    value.gsub(InternationalRE) {
      charset, encoding, string = $1, $2[0], $3
      if encoding == 66 or encoding == 98 # `B' or `b'
        string.unpack("m*")
      else
        string.tr('_', ' ').unpack("M*")
      end
    }
  end

  InternationalRE = /=\?(.*)\?([bBqQ])\?(([^?]|\?[^=])*)\?=/ # $1: charset, $2: encoding, $3: string
end # module RBMH