74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_HELPERS_H_
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#define RTC_BASE_HELPERS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include "rtc_base/system/rtc_export.h"
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namespace rtc {
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// For testing, we can return predictable data.
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void SetRandomTestMode(bool test);
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// Initializes the RNG, and seeds it with the specified entropy.
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bool InitRandom(int seed);
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bool InitRandom(const char* seed, size_t len);
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// Generates a (cryptographically) random string of the given length.
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// We generate base64 values so that they will be printable.
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RTC_EXPORT std::string CreateRandomString(size_t length);
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// Generates a (cryptographically) random string of the given length.
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// We generate base64 values so that they will be printable.
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// Return false if the random number generator failed.
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RTC_EXPORT bool CreateRandomString(size_t length, std::string* str);
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// Generates a (cryptographically) random string of the given length,
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// with characters from the given table. Return false if the random
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// number generator failed.
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// For ease of implementation, the function requires that the table
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// size evenly divide 256; otherwise, it returns false.
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RTC_EXPORT bool CreateRandomString(size_t length,
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const std::string& table,
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std::string* str);
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// Generates (cryptographically) random data of the given length.
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// Return false if the random number generator failed.
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bool CreateRandomData(size_t length, std::string* data);
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// Generates a (cryptographically) random UUID version 4 string.
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std::string CreateRandomUuid();
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// Generates a random id.
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uint32_t CreateRandomId();
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// Generates a 64 bit random id.
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RTC_EXPORT uint64_t CreateRandomId64();
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// Generates a random id > 0.
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uint32_t CreateRandomNonZeroId();
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// Generates a random double between 0.0 (inclusive) and 1.0 (exclusive).
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double CreateRandomDouble();
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// Compute moving average with the given ratio between the previous average
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// value and the current value.
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double GetNextMovingAverage(double prev_average, double cur, double ratio);
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} // namespace rtc
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#endif // RTC_BASE_HELPERS_H_
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