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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2016. 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%
%%
-module(bs_match_tail_SUITE).
-author('[email protected]').
-export([all/0, suite/0,
aligned/1,unaligned/1,zero_tail/1]).
-include_lib("common_test/include/ct.hrl").
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[aligned, unaligned, zero_tail].
%% Test aligned tails.
aligned(Config) when is_list(Config) ->
Tail1 = mkbin([]),
{258,Tail1} = al_get_tail_used(mkbin([1,2])),
Tail2 = mkbin(lists:seq(1, 127)),
{35091,Tail2} = al_get_tail_used(mkbin([137,19|Tail2])),
64896 = al_get_tail_unused(mkbin([253,128])),
64895 = al_get_tail_unused(mkbin([253,127|lists:seq(42, 255)])),
Tail3 = mkbin(lists:seq(0, 19)),
{0,Tail1} = get_dyn_tail_used(Tail1, 0),
{0,Tail3} = get_dyn_tail_used(mkbin([Tail3]), 0),
{73,Tail3} = get_dyn_tail_used(mkbin([73|Tail3]), 8),
0 = get_dyn_tail_unused(mkbin([]), 0),
233 = get_dyn_tail_unused(mkbin([233]), 8),
23 = get_dyn_tail_unused(mkbin([23,22,2]), 8),
ok.
al_get_tail_used(<<A:16,T/binary>>) -> {A,T}.
al_get_tail_unused(<<A:16,_/binary>>) -> A.
%% Test that an non-aligned tail cannot be matched out.
unaligned(Config) when is_list(Config) ->
{'EXIT',{function_clause,_}} = (catch get_tail_used(mkbin([42]))),
{'EXIT',{{badmatch,_},_}} = (catch get_dyn_tail_used(mkbin([137]), 3)),
{'EXIT',{function_clause,_}} = (catch get_tail_unused(mkbin([42,33]))),
{'EXIT',{{badmatch,_},_}} = (catch get_dyn_tail_unused(mkbin([44]), 7)),
ok.
get_tail_used(<<A:1,T/binary>>) -> {A,T}.
get_tail_unused(<<A:15,_/binary>>) -> A.
get_dyn_tail_used(Bin, Sz) ->
<<A:Sz,T/binary>> = Bin,
{A,T}.
get_dyn_tail_unused(Bin, Sz) ->
<<A:Sz,_/binary>> = Bin,
A.
%% Test that zero tails are tested correctly.
zero_tail(Config) when is_list(Config) ->
7 = (catch test_zero_tail(mkbin([7]))),
{'EXIT',{function_clause,_}} = (catch test_zero_tail(mkbin([1,2]))),
{'EXIT',{function_clause,_}} = (catch test_zero_tail2(mkbin([1,2,3]))),
ok.
test_zero_tail(<<A:8>>) -> A.
test_zero_tail2(<<_A:4,_B:4>>) -> ok.
mkbin(L) when is_list(L) -> list_to_binary(L).
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