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