rckrdmrd
97f407c661
- Prefijo v2: MCH - TRACEABILITY-MASTER.yml creado - Listo para integracion como submodulo Workspace: v2.0.0 | SIMCO: v4.0.0
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "Uuid.h"
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#include <array>
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#include <iomanip>
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#include <random>
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#include <sstream>
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namespace {
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std::mt19937& getThreadLocalEngine() {
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static thread_local std::random_device device;
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static thread_local std::mt19937 engine(device());
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return engine;
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}
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uint64_t randomUInt64(uint64_t max = std::numeric_limits<uint64_t>::max()) {
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std::uniform_int_distribution<uint64_t> distribution(0, max);
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return distribution(getThreadLocalEngine());
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}
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} // namespace
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namespace facebook::react {
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std::string generateRandomUuidString() {
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static constexpr uint8_t kUuidLength = 16;
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// see: https://tools.ietf.org/html/rfc4122#section-4.1.2 for reference
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static constexpr uint8_t kTimeLowSegBufEnd = sizeof(uint32_t);
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static constexpr uint8_t kTimeMidSegBufEnd =
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kTimeLowSegBufEnd + sizeof(uint16_t);
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static constexpr uint8_t kTimeHiAndVersionSegBufEnd =
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kTimeMidSegBufEnd + sizeof(uint16_t);
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static constexpr uint8_t kClockHiLoSegBufEnd =
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kTimeHiAndVersionSegBufEnd + sizeof(uint16_t);
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static constexpr uint8_t kNodeSegHiBufEnd =
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kClockHiLoSegBufEnd + sizeof(uint16_t);
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std::array<uint8_t, kUuidLength> uuidBytes;
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*(uint64_t*)uuidBytes.data() = randomUInt64();
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*(uint64_t*)(uuidBytes.data() + sizeof(uint64_t)) = randomUInt64();
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// Conforming to RFC 4122: https://www.cryptosys.net/pki/uuid-rfc4122.html
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uuidBytes[7] &= 0x0f;
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uuidBytes[7] |= 0x40;
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uuidBytes[9] &= 0x3f;
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uuidBytes[9] |= 0x80;
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std::stringstream ss;
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ss << std::setfill('0') << std::setw(8) << std::right << std::hex
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<< *(uint32_t*)uuidBytes.data() << "-" << std::setw(4)
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<< *(uint16_t*)(uuidBytes.data() + kTimeLowSegBufEnd) << "-"
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<< *(uint16_t*)(uuidBytes.data() + kTimeMidSegBufEnd) << "-"
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<< *(uint16_t*)(uuidBytes.data() + kTimeHiAndVersionSegBufEnd) << "-"
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<< std::setw(8) << *(uint32_t*)(uuidBytes.data() + kNodeSegHiBufEnd)
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<< std::setw(4) << *(uint16_t*)(uuidBytes.data() + kClockHiLoSegBufEnd);
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return ss.str();
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}
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} // namespace facebook::react
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