/* * Copyright (C) 2019 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * 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 "perfetto/ext/base/uuid.h" #include #include "perfetto/base/time.h" namespace perfetto { namespace base { namespace { constexpr char kHexmap[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; } // namespace // See https://www.ietf.org/rfc/rfc4122.txt Uuid Uuidv4() { static std::minstd_rand rng(static_cast(GetBootTimeNs().count())); Uuid uuid; auto& data = *uuid.data(); for (size_t i = 0; i < 16; ++i) data[i] = static_cast(rng()); // version: data[6] = (data[6] & 0x0f) | 0x40; // clock_seq_hi_and_reserved: data[8] = (data[8] & 0x3f) | 0x80; return uuid; } Uuid::Uuid() {} Uuid::Uuid(const std::string& s) { PERFETTO_CHECK(s.size() == data_.size()); memcpy(data_.data(), s.data(), s.size()); } Uuid::Uuid(int64_t lsb, int64_t msb) { set_lsb_msb(lsb, msb); } std::string Uuid::ToString() const { return std::string(reinterpret_cast(data_.data()), data_.size()); } std::string Uuid::ToPrettyString() const { std::string s(data_.size() * 2 + 4, '-'); // Format is 123e4567-e89b-12d3-a456-426655443322. size_t j = 0; for (size_t i = 0; i < data_.size(); ++i) { if (i == 4 || i == 6 || i == 8 || i == 10) j++; s[2 * i + j] = kHexmap[(data_[data_.size() - i - 1] & 0xf0) >> 4]; s[2 * i + 1 + j] = kHexmap[(data_[data_.size() - i - 1] & 0x0f)]; } return s; } } // namespace base } // namespace perfetto