%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(asn1rtt_per_common).

-include("asn1_records.hrl").

-export([decode_fragmented/3]).
-define('16K',16384).

decode_fragmented(SegSz0, Buf0, Unit) ->
    SegSz = SegSz0 * Unit * ?'16K',
    <<Res:SegSz/bitstring,Buf/bitstring>> = Buf0,
    decode_fragmented_1(Buf, Unit, Res).

decode_fragmented_1(<<0:1,N:7,Buf0/bitstring>>, Unit, Res) ->
    Sz = N*Unit,
    <<S:Sz/bitstring,Buf/bitstring>> = Buf0,
    {<<Res/bitstring,S/bitstring>>,Buf};
decode_fragmented_1(<<1:1,0:1,N:14,Buf0/bitstring>>, Unit, Res) ->
    Sz = N*Unit,
    <<S:Sz/bitstring,Buf/bitstring>> = Buf0,
    {<<Res/bitstring,S/bitstring>>,Buf};
decode_fragmented_1(<<1:1,1:1,SegSz0:6,Buf0/bitstring>>, Unit, Res0) ->
    SegSz = SegSz0 * Unit * ?'16K',
    <<Frag:SegSz/bitstring,Buf/bitstring>> = Buf0,
    Res = <<Res0/bitstring,Frag/bitstring>>,
    decode_fragmented_1(Buf, Unit, Res).