%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%% Generate random iolists to be used by crypto_SUITE.erl
%%
-module(random_iolist).
-export([run/3, standard_seed/0, compare/3,
random_iolist/1]).
run(Iter,Fun1,Fun2) ->
standard_seed(),
compare(Iter,Fun1,Fun2).
random_byte() ->
rand:uniform(256) - 1.
random_list(0,Acc) ->
Acc;
random_list(N,Acc) ->
random_list(N-1,[random_byte() | Acc]).
random_binary(N) ->
B = list_to_binary(random_list(N,[])),
case {rand:uniform(2),size(B)} of
{2,M} when M > 1 ->
S = M-1,
<<_:3,C:S/binary,_:5>> = B,
C;
_ ->
B
end.
random_list(N) ->
random_list(N,[]).
front() ->
case rand:uniform(10) of
10 ->
false;
_ ->
true
end.
any_type() ->
case rand:uniform(10) of
1 ->
list;
2 ->
binary;
3 ->
iolist;
_ ->
byte
end.
tail_type() ->
case rand:uniform(5) of
1 ->
list;
2 ->
iolist;
_ ->
binary
end.
random_length(N) ->
UpperLimit = 255,
case N of
M when M > UpperLimit ->
rand:uniform(UpperLimit+1) - 1;
_ ->
rand:uniform(N+1) - 1
end.
random_iolist(0,Acc) ->
Acc;
random_iolist(N,Acc) ->
case front() of
true ->
case any_type() of
list ->
X = random_length(N),
L = random_list(X),
random_iolist(N-X,[L|Acc]);
binary ->
X = random_length(N),
B = random_binary(X),
random_iolist(N-X,[B|Acc]);
iolist ->
X = random_length(N),
B = random_iolist(X),
random_iolist(N-X,[B|Acc]);
byte ->
C = random_byte(),
random_iolist(N-1,[C|Acc])
end;
false ->
case tail_type() of
list ->
X = random_length(N),
L = random_list(X),
random_iolist(N-X,[Acc|L]);
binary ->
X = random_length(N),
B = random_binary(X),
random_iolist(N-X,[Acc|B]);
iolist ->
X = random_length(N),
B = random_iolist(X),
random_iolist(N-X,[Acc|B])
end
end.
random_iolist(N) ->
random_iolist(N,[]).
standard_seed() ->
rand:seed(exsplus, {1201,855653,380975}).
do_comp(List,F1,F2) ->
X = F1(List),
Y = F2(List),
case X =:= Y of
false ->
exit({not_matching,List,X,Y});
_ ->
true
end.
compare(0,Fun1,Fun2) ->
do_comp(<<>>,Fun1,Fun2),
do_comp([],Fun1,Fun2),
do_comp([[]|<<>>],Fun1,Fun2),
do_comp([<<>>,[]|<<>>],Fun1,Fun2),
true;
compare(N,Fun1,Fun2) ->
L = random_iolist(N),
do_comp(L,Fun1,Fun2),
compare(N-1,Fun1,Fun2).
