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%% TODO: deduplicate code in parse/2 once there's proper tests
-module(p11p_rpc).
-export([parse/2, new/0, new/1, serialise/1]).
-include("p11p-rpc.hrl").
parse(M) ->
parse(M, <<>>).
-spec parse(p11rpc_msg(), binary()) -> {done, p11rpc_msg()} | {needmore, p11rpc_msg()} | {err, term()}.
parse(#p11rpc_msg{buffer = Buf} = M, Data) when M#p11rpc_msg.state == header ->
%% NOTE: Does _not_ consume buffer until it has at least 12 octets.
NewBuf = <<Buf/binary, Data/binary>>,
Msg = M#p11rpc_msg{buffer = NewBuf},
if
size(NewBuf) < 12 ->
{needmore, Msg};
true ->
parse(consume_header(Msg))
end;
parse(#p11rpc_msg{buffer = Buf} = M, Data) when M#p11rpc_msg.state == opts ->
NewBuf = <<Buf/binary, Data/binary>>,
Msg = consume_opts(M#p11rpc_msg{buffer = NewBuf}),
case Msg#p11rpc_msg.state of
opts ->
{needmore, Msg};
data ->
parse(Msg)
end;
parse(#p11rpc_msg{buffer = Buf} = M, Data) when M#p11rpc_msg.state == data ->
NewBuf = <<Buf/binary, Data/binary>>,
Msg = consume_data(M#p11rpc_msg{buffer = NewBuf}),
case Msg#p11rpc_msg.state of
data ->
{needmore, Msg};
done ->
{done, Msg}
end.
-spec serialise(p11rpc_msg()) -> binary().
serialise(_M) ->
<<"fixme">>.
%% Private
new() ->
new(<<>>).
new(Buffer) ->
#p11rpc_msg{buffer = Buffer}.
consume_header(#p11rpc_msg{buffer = Buf} = Msg) ->
Msg#p11rpc_msg{call_code = binary:decode_unsigned(binary:part(Buf, 0, 4)),
opt_len = binary:decode_unsigned(binary:part(Buf, 4, 4)),
data_len = binary:decode_unsigned(binary:part(Buf, 8, 4)),
state = opts,
buffer = binary:part(Buf, 12, size(Buf) - 12)}.
consume_opts(#p11rpc_msg{opt_len = Len, options = Opts, buffer = Buf} = Msg) ->
{NewData, NewBuf} = move_between_binaries(Opts, Buf, Len - size(Opts)),
NewState = case size(NewData) == Len of
true ->
data;
false ->
opts
end,
Msg#p11rpc_msg{options = NewData, buffer = NewBuf, state = NewState}.
consume_data(#p11rpc_msg{data_len = Len, data = Data, buffer = Buf} = Msg) ->
{NewData, NewBuf} = move_between_binaries(Data, Buf, Len - size(Data)),
NewState = case size(NewData) == Len of
true ->
done;
false ->
data
end,
Msg#p11rpc_msg{data = NewData, buffer = NewBuf, state = NewState}.
move_between_binaries(Dst, Src, N) when N == 0 ->
{Dst, Src};
move_between_binaries(Dst, Src, NAsk) ->
N = min(NAsk, size(Src)),
FromSrc = binary:part(Src, 0, N),
NewDst = <<Dst/binary, FromSrc/binary>>,
NewSrc = binary:part(Src, N, size(Src) - N),
{NewDst, NewSrc}.
%%%%%%%%%%%%%%
%% Unit tests.
-include_lib("eunit/include/eunit.hrl").
consume_data_test_() ->
{setup,
fun() ->
Msg = #p11rpc_msg{
data_len = 3,
data = <<"a">>,
buffer = <<"bcde">>},
consume_data(Msg) end,
fun(_) ->
ok end,
fun(Msg) ->
[?_assertEqual(
{p11rpc_msg, -1, -1, 3, <<>>, <<"abc">>, <<"de">>, done},
Msg)]
end}.
%% TODO: generate these, to make them exhaustive
parse1_test_() ->
{setup,
fun() ->
Buf0 = <<0:32/integer, 0:32/integer, 3:32/integer, "a">>,
{needmore, #p11rpc_msg{buffer = Buf1} = M1} = parse(new(Buf0)),
{needmore, #p11rpc_msg{buffer = Buf2} = M2} = parse(M1#p11rpc_msg{buffer = <<Buf1/binary, "b">>}),
{done, MDone} = parse(M2#p11rpc_msg{buffer = <<Buf2/binary, "cde">>}),
MDone
end,
fun(_) ->
ok end,
fun(Msg) ->
[?_assertEqual(
{p11rpc_msg, 0, 0, 3, <<>>, <<"abc">>, <<"de">>, done},
Msg)]
end}.
parse2_test_() ->
{setup,
fun() ->
Buf0 = <<47:32/integer, 2:32/integer, 3:32/integer, "o1d">>,
{needmore, #p11rpc_msg{buffer = Buf1} = M1} = parse(new(Buf0)),
{done, MDone} = parse(M1#p11rpc_msg{buffer = <<Buf1/binary, "12rest">>}),
MDone
end,
fun(_) ->
ok end,
fun(Msg) ->
[?_assertEqual(
{p11rpc_msg, 47, 2, 3, <<"o1">>, <<"d12">>, <<"rest">>, done},
Msg)]
end}.
parse3_test_() ->
{setup,
fun() ->
Buf0 = <<47:32/integer>>,
{needmore, #p11rpc_msg{buffer = Buf1} = M1} = parse(new(Buf0)),
{needmore, #p11rpc_msg{buffer = Buf2} = M2} = parse(M1#p11rpc_msg{buffer = <<Buf1/binary, 2:32/integer>>}),
{needmore, #p11rpc_msg{buffer = Buf3} = M3} = parse(M2#p11rpc_msg{buffer = <<Buf2/binary, 3:32/integer>>}),
{needmore, #p11rpc_msg{buffer = Buf4} = M4} = parse(M3#p11rpc_msg{buffer = <<Buf3/binary, "o1">>}),
{done, MDone} = parse(M4#p11rpc_msg{buffer = <<Buf4/binary, "d12rest">>}),
MDone
end,
fun(_) ->
ok end,
fun(Msg) ->
[?_assertEqual(
{p11rpc_msg, 47, 2, 3, <<"o1">>, <<"d12">>, <<"rest">>, done},
Msg)]
end}.
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