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%%% Copyright (c) 2019, Sunet.
%%% See LICENSE for licensing information.
%% 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 = MsgBuf} = M, DataIn)
when M#p11rpc_msg.state == header ->
Buf = <<MsgBuf/binary, DataIn/binary>>,
Msg = M#p11rpc_msg{buffer = Buf},
if
size(Buf) < 12 ->
{needmore, Msg};
true ->
parse(consume_header(Msg))
end;
parse(#p11rpc_msg{buffer = MsgBuf} = M, DataIn)
when M#p11rpc_msg.state == opts ->
Buf = <<MsgBuf/binary, DataIn/binary>>,
Msg = consume_opts(M#p11rpc_msg{buffer = Buf}),
case Msg#p11rpc_msg.state of
opts ->
{needmore, Msg};
data ->
parse(Msg)
end;
parse(#p11rpc_msg{buffer = MsgBuf} = M, DataIn)
when M#p11rpc_msg.state == data ->
Buf = <<MsgBuf/binary, DataIn/binary>>,
Msg = consume_data(M#p11rpc_msg{buffer = Buf}),
case Msg#p11rpc_msg.state of
data ->
{needmore, Msg};
done ->
{done, Msg}
end.
-spec serialise(p11rpc_msg()) -> binary().
serialise(M) when M#p11rpc_msg.state == done,
M#p11rpc_msg.call_code > -1,
M#p11rpc_msg.opt_len > -1,
M#p11rpc_msg.data_len > -1 ->
CallCode = M#p11rpc_msg.call_code,
OptLen = M#p11rpc_msg.opt_len,
DataLen = M#p11rpc_msg.data_len,
Options = M#p11rpc_msg.options,
Data = M#p11rpc_msg.data,
<<CallCode:32/integer,
OptLen:32/integer, DataLen:32/integer,
Options/binary, Data/binary>>.
%% 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 = MsgBuf} = M) ->
{Data, Buf} = move_between_binaries(Opts, MsgBuf, Len - size(Opts)),
State = case size(Data) == Len of
true ->
data;
false ->
opts
end,
M#p11rpc_msg{options = Data, buffer = Buf, state = State}.
consume_data(#p11rpc_msg{data_len = Len, data = DataIn, buffer = MsgBuf} = M) ->
{Data, Buf} = move_between_binaries(DataIn, MsgBuf, Len - size(DataIn)),
State = case size(Data) == Len of
true ->
done;
false ->
data
end,
M#p11rpc_msg{data = Data, buffer = Buf, state = State}.
move_between_binaries(DstIn, SrcIn, 0) ->
{DstIn, SrcIn};
move_between_binaries(DstIn, SrcIn, NBytes) ->
N = min(NBytes, size(SrcIn)),
FromSrc = binary:part(SrcIn, 0, N),
Dst = <<DstIn/binary, FromSrc/binary>>,
Src = binary:part(SrcIn, N, size(SrcIn) - N),
{Dst, Src}.
%%%%%%%%%%%%%%
%% 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 tests 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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