1/*
2 * libjingle
3 * Copyright 2004--2005, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_BASE_HELPERS_H_
29#define TALK_BASE_HELPERS_H_
30
31#include <string>
32#include "talk/base/basictypes.h"
33
34namespace talk_base {
35
36// For testing, we can return predictable data.
37void SetRandomTestMode(bool test);
38
39// Initializes the RNG, and seeds it with the specified entropy.
40bool InitRandom(int seed);
41bool InitRandom(const char* seed, size_t len);
42
43// Generates a (cryptographically) random string of the given length.
44// We generate base64 values so that they will be printable.
45// WARNING: could silently fail. Use the version below instead.
46std::string CreateRandomString(size_t length);
47
48// Generates a (cryptographically) random string of the given length.
49// We generate base64 values so that they will be printable.
50// Return false if the random number generator failed.
51bool CreateRandomString(size_t length, std::string* str);
52
53// Generates a (cryptographically) random string of the given length,
54// with characters from the given table. Return false if the random
55// number generator failed.
56bool CreateRandomString(size_t length, const std::string& table,
57                        std::string* str);
58
59// Generates a random id.
60uint32 CreateRandomId();
61
62// Generates a 64 bit random id.
63uint64 CreateRandomId64();
64
65// Generates a random id > 0.
66uint32 CreateRandomNonZeroId();
67
68// Generates a random double between 0.0 (inclusive) and 1.0 (exclusive).
69double CreateRandomDouble();
70
71}  // namespace talk_base
72
73#endif  // TALK_BASE_HELPERS_H_
74