pkt

%% Copyright (c) 2013-2015, Michael Santos <michael.santos@gmail.com>
%% All rights reserved.
%%
%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions
%% are met:
%%
%% Redistributions of source code must retain the above copyright
%% notice, this list of conditions and the following disclaimer.
%%
%% Redistributions in binary form must reproduce the above copyright
%% notice, this list of conditions and the following disclaimer in the
%% documentation and/or other materials provided with the distribution.
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%% Neither the name of the author nor the names of its contributors
%% may be used to endorse or promote products derived from this software
%% without specific prior written permission.
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%% "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
%% LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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%% INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
%% BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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%% POSSIBILITY OF SUCH DAMAGE.
-module(pkt_ipv6_dstopts).

%% RFC 2460: Internet Protocol, Version 6 (IPv6) Specification

-include("pkt_ipproto.hrl").
-include("pkt_ipv6.hrl").

-export([codec/1]).

codec(
    <<Next:8, Len:8, Rest/binary>>
) ->
    % Length of the Destination Options header in 8-octet units, not
    % including the first 8 octets
    OptLen = 6 + (Len * 8),
    <<Opt:OptLen/bytes, Payload/binary>> = Rest,
    {#ipv6_dstopts{
            next = Next,
            len = Len,
            opt = Opt
            }, Payload};
codec(#ipv6_dstopts{
            next = Next,
            len = Len,
            opt = Opt
        }) ->
    <<Next:8, Len:8, Opt/binary>>.