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-module(ss7_helper).
-author('Daniel Mende <mail@c0decafe.de>').
-include("ss7MAPer.hrl").
-export([encode_phonenumber/4,
decode_phonenumber/1,
encode_msisdn/4,
decode_imsi/1,
encode_imsi/1,
remove_firstN/2,
tup2bin/1]).
decode_imsi(<<>>) ->
[];
decode_imsi(Imsi) ->
<<First:4,Second:4,Rest/bits>> = Imsi,
Dec = decode_imsi(Rest),
if
First==15 -> lists:append([Second], Dec);
true -> lists:append([Second,First], Dec)
end.
encode_imsi([]) ->
<<>>;
encode_imsi([Last]) ->
<<15:4, Last:4>>;
encode_imsi([First,Second|Tail]) ->
EncImsi = encode_imsi(Tail),
<<Second:4, First:4, EncImsi/binary>>.
%% ===================================================================
%% Phone Number helper
%% ===================================================================
encode_phonenumber(Extension, NatureOfNumber, NumberPlan, Number) ->
{EncNumber, Digits} = encode_phonenumber(Number),
<<Digits:8, Extension:1, NatureOfNumber:3, NumberPlan:4, EncNumber/binary>>.
encode_phonenumber([First,Second|Tail]) ->
{EncNumber, Digits} = encode_phonenumber(Tail),
{<<Second:4, First:4, EncNumber/binary>>, Digits + 2};
encode_phonenumber([Last]) ->
{<<15:4, Last:4>>, 1};
encode_phonenumber([]) ->
{<<>>, 0}.
decode_phonenumber(<<_Extension:1, _NatureOfNumber:1, _NumberPlan:4, Number/binary>>) ->
decode_imsi(Number).
encode_msisdn(Extension, NatureOfNumber, NumberPlan, Number) ->
{EncNumber, _} = encode_phonenumber(Number),
<<Extension:1, NatureOfNumber:3, NumberPlan:4, EncNumber/binary>>.
%% ===================================================================
%% List helper
%% ===================================================================
remove_firstN(_, []) -> [];
remove_firstN(1, [_|T]) -> T;
remove_firstN(N, [_|T]) -> remove_firstN(N-1, T).
tup2bin(Tupel) ->
binary:list_to_bin([element(I,Tupel) || I <- lists:seq(1,tuple_size(Tupel))]).
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