mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
Alexey Polyudov
ce4807935e
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: Ic2bdb234e89f3c5860d1b483dd4bce689f13d057
90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
// Copyright 2020 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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#include "core/internal/mediums/uuid.h"
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#include <iomanip>
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#include <sstream>
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#include "platform/public/crypto.h"
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namespace location {
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namespace nearby {
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namespace connections {
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namespace {
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std::ostream& write_hex(std::ostream& os, absl::string_view data) {
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for (const auto b : data) {
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os << std::setfill('0')
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<< std::setw(2)
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<< std::hex
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<< (static_cast<unsigned int>(b) & 0x0ff);
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}
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return os;
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}
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} // namespace
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Uuid::Uuid(absl::string_view data) : data_(Crypto::Md5(data)) {
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// Based on the Java counterpart at
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// http://androidxref.com/8.0.0_r4/xref/libcore/ojluni/src/main/java/java/util/UUID.java#162.
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data_[6] &= 0x0f; // Clear version.
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data_[6] |= 0x30; // Set to version 3.
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data_[8] &= 0x3f; // Clear variant.
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data_[8] |= 0x80; // Set to IETF variant.
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}
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Uuid::Uuid(std::uint64_t most_sig_bits, std::uint64_t least_sig_bits) {
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// Base on the Java counterpart at
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// http://androidxref.com/8.0.0_r4/xref/libcore/ojluni/src/main/java/java/util/UUID.java#104.
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data_.reserve(sizeof(most_sig_bits) + sizeof(least_sig_bits));
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data_[0] = static_cast<char>((most_sig_bits >> 56) & 0x0ff);
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data_[1] = static_cast<char>((most_sig_bits >> 48) & 0x0ff);
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data_[2] = static_cast<char>((most_sig_bits >> 40) & 0x0ff);
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data_[3] = static_cast<char>((most_sig_bits >> 32) & 0x0ff);
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data_[4] = static_cast<char>((most_sig_bits >> 24) & 0x0ff);
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data_[5] = static_cast<char>((most_sig_bits >> 16) & 0x0ff);
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data_[6] = static_cast<char>((most_sig_bits >> 8) & 0x0ff);
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data_[7] = static_cast<char>((most_sig_bits >> 0) & 0x0ff);
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data_[8] = static_cast<char>((least_sig_bits >> 56) & 0x0ff);
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data_[9] = static_cast<char>((least_sig_bits >> 48) & 0x0ff);
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data_[10] = static_cast<char>((least_sig_bits >> 40) & 0x0ff);
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data_[11] = static_cast<char>((least_sig_bits >> 32) & 0x0ff);
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data_[12] = static_cast<char>((least_sig_bits >> 24) & 0x0ff);
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data_[13] = static_cast<char>((least_sig_bits >> 16) & 0x0ff);
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data_[14] = static_cast<char>((least_sig_bits >> 8) & 0x0ff);
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data_[15] = static_cast<char>((least_sig_bits >> 0) & 0x0ff);
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}
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Uuid::operator std::string() const {
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// Based on the Java counterpart at
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// http://androidxref.com/8.0.0_r4/xref/libcore/ojluni/src/main/java/java/util/UUID.java#375.
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std::ostringstream md5_hex;
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write_hex(md5_hex, absl::string_view(&data_[0], 4));
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md5_hex << "-";
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write_hex(md5_hex, absl::string_view(&data_[4], 2));
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md5_hex << "-";
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write_hex(md5_hex, absl::string_view(&data_[6], 2));
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md5_hex << "-";
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write_hex(md5_hex, absl::string_view(&data_[8], 2));
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md5_hex << "-";
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write_hex(md5_hex, absl::string_view(&data_[10], 6));
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return md5_hex.str();
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}
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} // namespace connections
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} // namespace nearby
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} // namespace location
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