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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_RAND_UTIL_H_
#define BASE_RAND_UTIL_H_
#include <stddef.h>
#include <stdint.h>
#include <string>
#include "base/base_export.h"
#include "build/build_config.h"
namespace base {
// Returns a random number in range [0, UINT64_MAX]. Thread-safe.
BASE_EXPORT uint64_t RandUint64();
// Returns a random number between min and max (inclusive). Thread-safe.
BASE_EXPORT int RandInt(int min, int max);
// Returns a random number in range [0, range). Thread-safe.
//
// Note that this can be used as an adapter for std::random_shuffle():
// Given a pre-populated |std::vector<int> myvector|, shuffle it as
// std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator);
BASE_EXPORT uint64_t RandGenerator(uint64_t range);
// Returns a random double in range [0, 1). Thread-safe.
BASE_EXPORT double RandDouble();
// Given input |bits|, convert with maximum precision to a double in
// the range [0, 1). Thread-safe.
BASE_EXPORT double BitsToOpenEndedUnitInterval(uint64_t bits);
// Fills |output_length| bytes of |output| with random data.
//
// WARNING:
// Do not use for security-sensitive purposes.
// See crypto/ for cryptographically secure random number generation APIs.
BASE_EXPORT void RandBytes(void* output, size_t output_length);
// Fills a string of length |length| with random data and returns it.
// |length| should be nonzero.
//
// Note that this is a variation of |RandBytes| with a different return type.
// The returned string is likely not ASCII/UTF-8. Use with care.
//
// WARNING:
// Do not use for security-sensitive purposes.
// See crypto/ for cryptographically secure random number generation APIs.
BASE_EXPORT std::string RandBytesAsString(size_t length);
#if defined(OS_POSIX)
BASE_EXPORT int GetUrandomFD();
#endif
} // namespace base
#endif // BASE_RAND_UTIL_H_
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