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1 /*
2  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_BASE_HELPERS_H_
12 #define WEBRTC_BASE_HELPERS_H_
13 
14 #include <string>
15 #include "webrtc/base/basictypes.h"
16 
17 namespace rtc {
18 
19 // For testing, we can return predictable data.
20 void SetRandomTestMode(bool test);
21 
22 // Initializes the RNG, and seeds it with the specified entropy.
23 bool InitRandom(int seed);
24 bool InitRandom(const char* seed, size_t len);
25 
26 // Generates a (cryptographically) random string of the given length.
27 // We generate base64 values so that they will be printable.
28 // WARNING: could silently fail. Use the version below instead.
29 std::string CreateRandomString(size_t length);
30 
31 // Generates a (cryptographically) random string of the given length.
32 // We generate base64 values so that they will be printable.
33 // Return false if the random number generator failed.
34 bool CreateRandomString(size_t length, std::string* str);
35 
36 // Generates a (cryptographically) random string of the given length,
37 // with characters from the given table. Return false if the random
38 // number generator failed.
39 bool CreateRandomString(size_t length, const std::string& table,
40                         std::string* str);
41 
42 // Generates a random id.
43 uint32 CreateRandomId();
44 
45 // Generates a 64 bit random id.
46 uint64 CreateRandomId64();
47 
48 // Generates a random id > 0.
49 uint32 CreateRandomNonZeroId();
50 
51 // Generates a random double between 0.0 (inclusive) and 1.0 (exclusive).
52 double CreateRandomDouble();
53 
54 }  // namespace rtc
55 
56 #endif  // WEBRTC_BASE_HELPERS_H_
57