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parse(Data) ->
io:format("~p~n", [Data]),
<<A:8, B:8, C/binary>> = Data,
FinalMark = case (bit_nth(0, A)) of 1 -> true; 0 -> false end,
MaskMark = case (bit_nth(0, B)) of 1 -> true; 0 -> false end,
Result1 = [{final, FinalMark}, {masked, MaskMark}],
Opcode = case <<A:4>> of
<<16#0:4>> -> continuation_frame;
<<16#1:4>> -> text_frame;
<<16#2:4>> -> binary_frame;
<<16#8:4>> -> connection_closed;
<<16#9:4>> -> ping;
<<16#a:4>> -> pong;
<<_:4>> -> unknown
end,
Result2 = Result1 ++ [{opcode, Opcode}],
<<LengthSign:7>> = <<B:7>>,
Length = if
LengthSign =< 125 ->
C1 = C,
LengthSign;
LengthSign == 126 ->
<<L0:16, C1/binary>> = C, L0;
LengthSign == 127 ->
<<L0:64, C1/binary>> = C, L0
end,
Result3 = Result2 ++ [{length, Length}],
case MaskMark of
true ->
<<MaskingKey0:8, MaskingKey1:8, MaskingKey2:8, MaskingKey3:8, C2/binary>> = C1,
MaskingKey = [MaskingKey0, MaskingKey1, MaskingKey2, MaskingKey3],
Result4 = Result3 ++ [{masking_key, MaskingKey}],
Payload = binary_to_list(C2),
TX = decode(Payload, lists:reverse(MaskingKey), 0, []);
false -> C2 = C1, Result4 = Result3,
Payload = binary_to_list(C2), TX = Payload
end,
Result = Result4 ++ [{msg, TX}],
Result.
Пишу модуль для работы с веб-сокетами на Эрланге. Эта функция парсит и декодирует пакет, присылаемый клиентом.
Функцию я уже переписал.
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