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Copy pathrandom.cpp
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47 lines (39 loc) · 1.31 KB
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/*
* Tencent is pleased to support the open source community by making Pebble available.
* Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*
*/
#include <fcntl.h>
#include <unistd.h>
#include "common/random.h"
namespace common {
TrueRandom::TrueRandom()
: m_fd(-1) {
m_fd = open("/dev/urandom", O_RDONLY, 0);
if (m_fd < 0) {
abort();
}
}
TrueRandom::~TrueRandom() {
close(m_fd);
m_fd = -1;
}
bool TrueRandom::NextBytes(void* buffer, size_t size) {
return read(m_fd, buffer, size) == static_cast<int32_t>(size);
}
uint32_t TrueRandom::NextUInt32() {
uint32_t random = -1;
NextBytes(&random, sizeof(random));
return random;
}
uint32_t TrueRandom::NextUInt32(uint32_t max_random) {
return NextUInt32() % max_random;
}
} // namespace common