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 34 namespace talk_base { 35 36 // For testing, we can return predictable data. 37 void SetRandomTestMode(bool test); 38 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); 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. 46 std::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. 51 bool 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. 56 bool CreateRandomString(size_t length, const std::string& table, 57 std::string* str); 58 59 // Generates a random id. 60 uint32 CreateRandomId(); 61 62 // Generates a 64 bit random id. 63 uint64 CreateRandomId64(); 64 65 // Generates a random id > 0. 66 uint32 CreateRandomNonZeroId(); 67 68 // Generates a random double between 0.0 (inclusive) and 1.0 (exclusive). 69 double CreateRandomDouble(); 70 71 } // namespace talk_base 72 73 #endif // TALK_BASE_HELPERS_H_ 74
