| 1 |
|
%%%---------------------------------------------------------------------- |
| 2 |
|
%%% File : mongoose_bin.erl |
| 3 |
|
%%% Author : Piotr Nosek <piotr.nosek@erlang-solutions.com> |
| 4 |
|
%%% Purpose : Binaries manipulation and generation |
| 5 |
|
%%% Created : 24 Jul 2018 by Piotr Nosek <piotr.nosek@erlang-solutions.com> |
| 6 |
|
%%%---------------------------------------------------------------------- |
| 7 |
|
|
| 8 |
|
-module(mongoose_bin). |
| 9 |
|
-author('piotr.nosek@erlang-solutions.com'). |
| 10 |
|
|
| 11 |
|
-export([tokens/2, |
| 12 |
|
join/2, |
| 13 |
|
gen_from_crypto/0, |
| 14 |
|
gen_from_timestamp/0, |
| 15 |
|
string_to_binary/1]). |
| 16 |
|
|
| 17 |
|
%% --------------------------------------------------- |
| 18 |
|
%% API |
| 19 |
|
%% --------------------------------------------------- |
| 20 |
|
|
| 21 |
|
%% tokens/2 and join/2 functions from original str.erl module |
| 22 |
|
%% (C) Evgeniy Khramtsov <ekhramtsov@process-one.net> |
| 23 |
|
|
| 24 |
|
%% Each byte in second argument is treated as distinct, one-character separator |
| 25 |
|
-spec tokens(Subject :: binary(), BinaryWithSeparators :: binary()) -> [binary()]. |
| 26 |
|
tokens(B1, B2) -> |
| 27 |
462 |
[list_to_binary(T) || |
| 28 |
462 |
T <- string:tokens(binary_to_list(B1), binary_to_list(B2))]. |
| 29 |
|
|
| 30 |
|
-spec join(BinsToJoin :: [binary()], Separator :: binary() | char()) -> binary(). |
| 31 |
|
join(L, Sep) -> |
| 32 |
26 |
iolist_to_binary(join_s(L, Sep)). |
| 33 |
|
|
| 34 |
|
-spec gen_from_crypto() -> binary(). |
| 35 |
|
gen_from_crypto() -> |
| 36 |
7807 |
base16:encode(crypto:strong_rand_bytes(8)). |
| 37 |
|
|
| 38 |
|
-spec gen_from_timestamp() -> binary(). |
| 39 |
|
gen_from_timestamp() -> |
| 40 |
862 |
{Mega, Secs, Micro} = os:timestamp(), |
| 41 |
862 |
MegaB = integer_to_binary(Mega), |
| 42 |
862 |
SecsB = integer_to_binary(Secs), |
| 43 |
862 |
MicroB = integer_to_binary(Micro), |
| 44 |
862 |
<<MegaB/binary, $-, SecsB/binary, $-, MicroB/binary>>. |
| 45 |
|
|
| 46 |
|
-spec string_to_binary(binary() | list()) -> binary(). |
| 47 |
|
string_to_binary(S) when is_list(S) -> |
| 48 |
|
% If list is in Erlang representation of Unicode, we must use `unicode` module |
| 49 |
|
% If it's not or is already converted, we must use list_to_binary |
| 50 |
|
% since input can be from `file:consult/1` and prior to 17.0 |
| 51 |
|
% this function returned bytes in a list instead of proper unicode string |
| 52 |
|
% so it is already like after a call to `unicode`. |
| 53 |
40 |
case lists:any(fun(C) -> C > 255 end, S) of |
| 54 |
6 |
true -> unicode:characters_to_binary(S); |
| 55 |
34 |
false -> list_to_binary(S) |
| 56 |
|
end; |
| 57 |
|
string_to_binary(B) when is_binary(B) -> |
| 58 |
:-( |
B. |
| 59 |
|
|
| 60 |
|
%% --------------------------------------------------- |
| 61 |
|
%% Internal functions |
| 62 |
|
%% --------------------------------------------------- |
| 63 |
|
join_s([], _Sep) -> |
| 64 |
:-( |
[]; |
| 65 |
|
join_s([H|T], Sep) -> |
| 66 |
26 |
[H, [[Sep, X] || X <- T]]. |