4158678b46
since it contains helpers mostly related to cryptographically secure random numbers and strings. BUG=webrtc:339300437 Change-Id: I10db939534b25dc792ac1600a4721d1b84521880 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/352620 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Philipp Hancke <phancke@meta.com> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42441}
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
/*
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* Copyright 2018 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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#include "rtc_base/unique_id_generator.h"
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#include <limits>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "rtc_base/crypto_random.h"
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#include "rtc_base/string_encode.h"
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#include "rtc_base/string_to_number.h"
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namespace rtc {
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UniqueRandomIdGenerator::UniqueRandomIdGenerator() : known_ids_() {}
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UniqueRandomIdGenerator::UniqueRandomIdGenerator(ArrayView<uint32_t> known_ids)
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: known_ids_(known_ids.begin(), known_ids.end()) {}
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UniqueRandomIdGenerator::~UniqueRandomIdGenerator() = default;
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uint32_t UniqueRandomIdGenerator::GenerateId() {
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webrtc::MutexLock lock(&mutex_);
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RTC_CHECK_LT(known_ids_.size(), std::numeric_limits<uint32_t>::max() - 1);
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while (true) {
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auto pair = known_ids_.insert(CreateRandomNonZeroId());
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if (pair.second) {
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return *pair.first;
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}
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}
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}
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bool UniqueRandomIdGenerator::AddKnownId(uint32_t value) {
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webrtc::MutexLock lock(&mutex_);
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return known_ids_.insert(value).second;
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}
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UniqueStringGenerator::UniqueStringGenerator() : unique_number_generator_() {}
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UniqueStringGenerator::UniqueStringGenerator(ArrayView<std::string> known_ids) {
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for (const std::string& str : known_ids) {
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AddKnownId(str);
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}
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}
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UniqueStringGenerator::~UniqueStringGenerator() = default;
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std::string UniqueStringGenerator::GenerateString() {
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return ToString(unique_number_generator_.GenerateNumber());
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}
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bool UniqueStringGenerator::AddKnownId(absl::string_view value) {
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// TODO(webrtc:13579): remove string copy here once absl::string_view version
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// of StringToNumber is available.
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absl::optional<uint32_t> int_value =
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StringToNumber<uint32_t>(std::string(value));
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// The underlying generator works for uint32_t values, so if the provided
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// value is not a uint32_t it will never be generated anyway.
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if (int_value.has_value()) {
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return unique_number_generator_.AddKnownId(int_value.value());
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}
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return false;
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}
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} // namespace rtc
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