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28 #ifndef TALK_BASE_HELPERS_H_
29 #define TALK_BASE_HELPERS_H_
32 #include "talk/base/basictypes.h"
36 // For testing, we can return predictable data.
37 void SetRandomTestMode(bool test);
39 // Initializes the RNG, and seeds it with the specified entropy.
40 bool InitRandom(int seed);
41 bool InitRandom(const char* seed, size_t len);
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.
46 std::string CreateRandomString(size_t length);
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.
51 bool CreateRandomString(size_t length, std::string* str);
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.
56 bool CreateRandomString(size_t length, const std::string& table,
59 // Generates a random id.
60 uint32 CreateRandomId();
62 // Generates a 64 bit random id.
63 uint64 CreateRandomId64();
65 // Generates a random id > 0.
66 uint32 CreateRandomNonZeroId();
68 // Generates a random double between 0.0 (inclusive) and 1.0 (exclusive).
69 double CreateRandomDouble();
71 } // namespace talk_base
73 #endif // TALK_BASE_HELPERS_H_