1 //
2 //
3 // Copyright 2023 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #include "src/core/util/uuid_v4.h"
20
21 #include <grpc/support/port_platform.h>
22
23 #include "absl/strings/str_format.h"
24
25 namespace grpc_core {
26
GenerateUUIDv4(uint64_t hi,uint64_t lo)27 std::string GenerateUUIDv4(uint64_t hi, uint64_t lo) {
28 uint32_t time_low = hi >> 32;
29 uint16_t time_mid = hi >> 16;
30 uint16_t time_hi_and_version = (hi & 0x0fff) | 0x4000;
31 uint16_t clock_seq_hi_low = ((lo >> 48) & 0x3fff) | 0x8000;
32 uint64_t node = lo & 0xffffffffffff;
33 return absl::StrFormat("%08x-%04x-%04x-%04x-%012x", time_low, time_mid,
34 time_hi_and_version, clock_seq_hi_low, node);
35 }
36
37 } // namespace grpc_core
38