mirror of
https://github.com/kidfromjupiter/nearby.git
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58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_WEAVE_SOCKETS_INITIAL_DATA_PROVIDER_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_WEAVE_SOCKETS_INITIAL_DATA_PROVIDER_H_
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#include <cstdint>
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#include <string>
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#include "absl/random/random.h"
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#include "absl/strings/str_format.h"
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namespace nearby {
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namespace weave {
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class InitialDataProvider {
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public:
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virtual ~InitialDataProvider() = default;
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virtual std::string Provide() { return ""; }
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};
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class RandomDataProvider : public InitialDataProvider {
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public:
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explicit RandomDataProvider(int number_of_bytes)
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: number_of_bytes_(number_of_bytes) {}
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std::string Provide() override {
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// We multiply by 4, because while multiplying by 8 would give us a
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// 64-bit number, the hex string would be double the length due to two
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// hex characters representing one byte.
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uint32_t power = number_of_bytes_ * 4;
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uint64_t res = absl::uniform_int_distribution<uint64_t>(
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1, 1ULL << power)(prng_);
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std::string res_str = absl::StrFormat("%0*x", number_of_bytes_, res);
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res_str.resize(number_of_bytes_);
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return res_str;
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}
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private:
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int number_of_bytes_;
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absl::BitGen prng_;
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};
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} // namespace weave
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_INTERNAL_WEAVE_SOCKETS_INITIAL_DATA_PROVIDER_H_
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