mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 15:16:12 -04:00
Alexey Polyudov
c3a89bb894
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I8ca8ef4727e289f3c6ea62ad73008ad718096e5d
115 lines
4.3 KiB
C++
115 lines
4.3 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/api/hash_utils.h"
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#include "platform/ptr.h"
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namespace location {
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namespace nearby {
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namespace connections {
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template <typename Platform>
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UUID<Platform>::UUID(const string& 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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ScopedPtr<Ptr<HashUtils> > scoped_hash_utils(Platform::createHashUtils());
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ScopedPtr<ConstPtr<ByteArray> > scoped_md5_bytes(
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scoped_hash_utils->md5(data));
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data_.assign(scoped_md5_bytes->getData(), scoped_md5_bytes->size());
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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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template <typename Platform>
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UUID<Platform>::UUID(std::int64_t most_sig_bits, std::int64_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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template <typename Platform>
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UUID<Platform>::~UUID() {}
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template <typename Platform>
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string UUID<Platform>::str() {
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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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// The masking with 0x0ff is essential because we're taking 8-bit bytes and
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// casting them to integers (which, depending on the platform, are 16- or
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// 32-bits wide); without that, we get a leading FF (16-bit) or FFFFFF
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// (32-bit) when the MSB of the 8-bit byte is 1.
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//
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// And the cast to an integer is required because std::hex only takes effect
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// on integral types (and no, uint8_t doesn't activate it).
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#define BYTE_TO_HEX(b) \
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std::setfill('0') << std::setw(2) << std::hex \
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<< (static_cast<unsigned int>(b) & 0x0ff)
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std::ostringstream md5_hex;
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md5_hex << BYTE_TO_HEX(data_[0]);
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md5_hex << BYTE_TO_HEX(data_[1]);
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md5_hex << BYTE_TO_HEX(data_[2]);
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md5_hex << BYTE_TO_HEX(data_[3]);
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md5_hex << "-";
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md5_hex << BYTE_TO_HEX(data_[4]);
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md5_hex << BYTE_TO_HEX(data_[5]);
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md5_hex << "-";
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md5_hex << BYTE_TO_HEX(data_[6]);
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md5_hex << BYTE_TO_HEX(data_[7]);
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md5_hex << "-";
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md5_hex << BYTE_TO_HEX(data_[8]);
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md5_hex << BYTE_TO_HEX(data_[9]);
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md5_hex << "-";
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md5_hex << BYTE_TO_HEX(data_[10]);
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md5_hex << BYTE_TO_HEX(data_[11]);
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md5_hex << BYTE_TO_HEX(data_[12]);
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md5_hex << BYTE_TO_HEX(data_[13]);
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md5_hex << BYTE_TO_HEX(data_[14]);
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md5_hex << BYTE_TO_HEX(data_[15]);
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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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