1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #include "detector.h"
17 
18 #include <iostream>
19 #include <cstdio>
20 #include <cstdlib>
21 #include <sys/stat.h>
22 
23 using namespace std;
24 namespace DetectorTest {
25     const int HALF = 2;
26     const int START_INDEX = 3;
27 }
28 
29 namespace {
IsPrime(int n)30 bool IsPrime(int n)
31 {
32     if (n <= 1) {
33         return false;
34     }
35 
36     if (!(n % DetectorTest::HALF)) {
37         return n == DetectorTest::HALF;
38     }
39 
40     for (int i = DetectorTest::START_INDEX;; i += DetectorTest::HALF) {
41         if (i > (n / i)) {
42             break;
43         }
44         if (!(n % i)) {
45             return false;
46         }
47     }
48 
49     return true;
50 }
51 
FileExist(const char* fileName)52 bool FileExist(const char* fileName)
53 {
54     if (fileName == nullptr) {
55         return false;
56     }
57     struct stat myStat;
58     return (!stat(fileName, &myStat));
59 }
60 }
61