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Diffstat (limited to 'src/randoms.erl')
-rw-r--r-- | src/randoms.erl | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/src/randoms.erl b/src/randoms.erl deleted file mode 100644 index 101241a3c..000000000 --- a/src/randoms.erl +++ /dev/null @@ -1,91 +0,0 @@ -%%%---------------------------------------------------------------------- -%%% File : randoms.erl -%%% Author : Alexey Shchepin <alexey@process-one.net> -%%% Purpose : Random generation number wrapper -%%% Created : 13 Dec 2002 by Alexey Shchepin <alexey@process-one.net> -%%% -%%% -%%% ejabberd, Copyright (C) 2002-2018 ProcessOne -%%% -%%% This program is free software; you can redistribute it and/or -%%% modify it under the terms of the GNU General Public License as -%%% published by the Free Software Foundation; either version 2 of the -%%% License, or (at your option) any later version. -%%% -%%% This program is distributed in the hope that it will be useful, -%%% but WITHOUT ANY WARRANTY; without even the implied warranty of -%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -%%% General Public License for more details. -%%% -%%% You should have received a copy of the GNU General Public License along -%%% with this program; if not, write to the Free Software Foundation, Inc., -%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. -%%% -%%%---------------------------------------------------------------------- - --module(randoms). - --author('alexey@process-one.net'). - --export([get_string/0, uniform/0, uniform/1, uniform/2, bytes/1, - round_robin/1, get_alphanum_string/1]). - --define(THRESHOLD, 16#10000000000000000). - --ifdef(RAND_UNIFORM). -get_string() -> - R = rand:uniform(?THRESHOLD), - integer_to_binary(R). - -uniform() -> - rand:uniform(). - -uniform(N) -> - rand:uniform(N). - -uniform(N, M) -> - rand:uniform(M-N+1) + N-1. --else. -get_string() -> - R = crypto:rand_uniform(0, ?THRESHOLD), - integer_to_binary(R). - -uniform() -> - crypto:rand_uniform(0, ?THRESHOLD)/?THRESHOLD. - -uniform(N) -> - crypto:rand_uniform(1, N+1). - -uniform(N, M) -> - crypto:rand_uniform(N, M+1). --endif. - --ifdef(STRONG_RAND_BYTES). -bytes(N) -> - crypto:strong_rand_bytes(N). --else. -bytes(N) -> - crypto:rand_bytes(N). --endif. - --spec round_robin(pos_integer()) -> non_neg_integer(). -round_robin(N) -> - p1_time_compat:unique_integer([monotonic, positive]) rem N. - --spec get_alphanum_string(non_neg_integer()) -> binary(). -get_alphanum_string(Length) -> - list_to_binary(get_alphanum_string([], Length)). - --spec get_alphanum_string(string(), non_neg_integer()) -> string(). -get_alphanum_string(S, 0) -> S; -get_alphanum_string(S, N) -> - get_alphanum_string([make_rand_char() | S], N - 1). - --spec make_rand_char() -> char(). -make_rand_char() -> - map_int_to_char(uniform(0, 61)). - --spec map_int_to_char(0..61) -> char(). -map_int_to_char(N) when N =< 9 -> N + 48; % Digit. -map_int_to_char(N) when N =< 35 -> N + 55; % Upper-case character. -map_int_to_char(N) when N =< 61 -> N + 61. % Lower-case character. |