class Mail::ParameterHash

:nodoc:
Parameters are defined in RFC2045. Split keys are in RFC2231.
to make that happen
a single key called name=“blahbleh” and do any required un-encoding
have the name*0=“blah”, name*1=“bleh” keys, and will just return
parameter values including the MIME extension paramaters that
ParameterHash is an intelligent Hash that allows you to add

def [](key_name)

:nodoc:
Parameters are defined in RFC2045. Split keys are in RFC2231.

to make that happen
a single key called name="blahbleh" and do any required un-encoding
have the name*0="blah", name*1="bleh" keys, and will just return
parameter values including the MIME extension paramaters that
ParameterHash is an intelligent Hash that allows you to add 
def [](key_name)
  key_pattern = Regexp.escape(key_name.to_s)
  pairs = []
  exact = nil
  each do |k,v|
    if k =~ /^#{key_pattern}(\*|$)/i
      if $1 == Constants::ASTERISK
        pairs << [k, v]
      else
        exact = k
      end
    end
  end
  if pairs.empty? # Just dealing with a single value pair
    super(exact || key_name)
  else # Dealing with a multiple value pair or a single encoded value pair
    string = pairs.sort { |a,b| a.first.to_s <=> b.first.to_s }.map { |v| v.last }.join('')
    if mt = string.match(/([\w\-]+)?'(\w\w)?'(.*)/)
      string = mt[3]
      encoding = mt[1]
    else
      encoding = nil
    end
    Mail::Encodings.param_decode(string, encoding)
  end
end

def decoded 

def decoded
  map.sort_by { |a| a.first.to_s }.map! do |key_name, value|
    %Q{#{key_name}=#{Utilities.quote_token(value)}}
  end.join("; ")
end

def encoded 

def encoded
  map.sort_by { |a| a.first.to_s }.map! do |key_name, value|
    unless value.ascii_only?
      value = Mail::Encodings.param_encode(value)
      key_name = "#{key_name}*"
    end
    %Q{#{key_name}=#{Utilities.quote_token(value)}}
  end.join(";\r\n\s")
end