mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
// Copyright 2020 Google LLC
|
|
//
|
|
// 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
|
|
//
|
|
// https://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 "internal/platform/bluetooth_utils.h"
|
|
|
|
#include <algorithm>
|
|
#include <cstdint>
|
|
#include <string>
|
|
|
|
#include "absl/strings/ascii.h"
|
|
#include "absl/strings/escaping.h"
|
|
#include "absl/strings/str_cat.h"
|
|
#include "absl/strings/str_format.h"
|
|
#include "absl/strings/string_view.h"
|
|
#include "internal/platform/byte_array.h"
|
|
|
|
namespace nearby {
|
|
|
|
std::string BluetoothUtils::ToString(const ByteArray& bluetooth_mac_address) {
|
|
std::string colon_delimited_string;
|
|
|
|
if (bluetooth_mac_address.size() != kBluetoothMacAddressLength)
|
|
return colon_delimited_string;
|
|
|
|
if (IsBluetoothMacAddressUnset(bluetooth_mac_address))
|
|
return colon_delimited_string;
|
|
|
|
for (auto byte : std::string(bluetooth_mac_address)) {
|
|
if (!colon_delimited_string.empty())
|
|
absl::StrAppend(&colon_delimited_string, ":");
|
|
absl::StrAppend(&colon_delimited_string, absl::StrFormat("%02X", byte));
|
|
}
|
|
return colon_delimited_string;
|
|
}
|
|
|
|
ByteArray BluetoothUtils::FromString(absl::string_view bluetooth_mac_address) {
|
|
std::string bt_mac_address(bluetooth_mac_address);
|
|
|
|
bt_mac_address.erase(
|
|
std::remove(bt_mac_address.begin(), bt_mac_address.end(), ':'),
|
|
bt_mac_address.end());
|
|
|
|
if (bt_mac_address.length() != kBluetoothMacAddressLength * 2 ||
|
|
!std::all_of(bt_mac_address.begin(), bt_mac_address.end(),
|
|
absl::ascii_isxdigit)) {
|
|
return ByteArray();
|
|
}
|
|
auto bt_mac_address_string(absl::HexStringToBytes(bt_mac_address));
|
|
auto bt_mac_address_bytes =
|
|
ByteArray(bt_mac_address_string.data(), bt_mac_address_string.size());
|
|
if (IsBluetoothMacAddressUnset(bt_mac_address_bytes)) {
|
|
return ByteArray();
|
|
}
|
|
return bt_mac_address_bytes;
|
|
}
|
|
|
|
bool BluetoothUtils::IsBluetoothMacAddressUnset(
|
|
const ByteArray& bluetooth_mac_address_bytes) {
|
|
for (int i = 0; i < bluetooth_mac_address_bytes.size(); i++) {
|
|
if (bluetooth_mac_address_bytes.data()[i] != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
std::string BluetoothUtils::FromNumber(std::uint64_t address) {
|
|
// Gets byte `index` from `address`.
|
|
auto b = [&](int index) {
|
|
return (std::uint8_t)(address >> (56 - 8 * index));
|
|
};
|
|
return absl::StrFormat("%02X:%02X:%02X:%02X:%02X:%02X", b(2), b(3), b(4),
|
|
b(5), b(6), b(7));
|
|
}
|
|
|
|
std::uint64_t BluetoothUtils::ToNumber(absl::string_view address) {
|
|
ByteArray binary = FromString(address);
|
|
if (binary.size() != kBluetoothMacAddressLength) {
|
|
return 0;
|
|
}
|
|
std::uint64_t result = 0;
|
|
for (char ch : binary.AsStringView()) {
|
|
result <<= 8;
|
|
result |= static_cast<uint8_t>(ch);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
} // namespace nearby
|