mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
131 lines
4.2 KiB
C++
131 lines
4.2 KiB
C++
// Copyright 2022 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/implementation/wifi_utils.h"
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#include <string>
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#include <vector>
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_format.h"
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#include "absl/strings/str_join.h"
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#include "absl/strings/str_split.h"
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#include "absl/strings/string_view.h"
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namespace nearby {
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// Utility function to convert channel number to frequency in MHz
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// @param channel to convert
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// @return center frequency in Mhz of the channel, return "kUnspecified" if no
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// match
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// Add band support later
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int WifiUtils::ConvertChannelToFrequencyMhz(int channel, WifiBandType band) {
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if (band == WifiBandType::kUnknown || band == WifiBandType::kBand24Ghz ||
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band == WifiBandType::kBand5Ghz) {
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if (channel == 14) {
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return 2484;
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} else if (channel >= kBand24GhzFirstChNum &&
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channel <= kBand24GhzLastChNum) {
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return ((channel - kBand24GhzFirstChNum) * 5) + kBand24GhzStartFreqMhz;
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} else if (channel >= kBand5GhzFirstChNum &&
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channel <= kBand5GhzLastChNum) {
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return ((channel - kBand5GhzFirstChNum) * 5) + kBand5GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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if (band == WifiBandType::kBand6Ghz) {
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if (channel >= kBand6GhzFirstChNum && channel <= kBand6GhzLastChNum) {
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if (channel == 2) {
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return kBand6GhzOpClass136Ch2FreqMhz;
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}
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return ((channel - kBand6GhzFirstChNum) * 5) + kBand6GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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if (band == WifiBandType::kBand60Ghz) {
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if (channel >= kBand60GhzFirstChNum && channel <= kBand60GhzLastChNum) {
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return ((channel - kBand60GhzFirstChNum) * 2160) + kBand60GhzStartFreqMhz;
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} else {
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return kUnspecified;
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}
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}
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return kUnspecified;
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}
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// Utility function to convert frequency in MHz to channel number
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// @param freqMhz frequency in MHz
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// @return channel number associated with given frequency, return "kUnspecified"
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// if no match
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int WifiUtils::ConvertFrequencyMhzToChannel(int freq_mhz) {
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// Special case
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if (freq_mhz == kBand24GhzEndFreqMhz) {
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return 14;
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} else if (freq_mhz >= kBand24GhzStartFreqMhz &&
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freq_mhz <= kBand24GhzEndFreqMhz) {
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return (freq_mhz - kBand24GhzStartFreqMhz) / 5 + kBand24GhzFirstChNum;
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} else if (freq_mhz >= kBand5GhzStartFreqMhz &&
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freq_mhz <= kBand5GhzEndFreqMhz) {
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return (freq_mhz - kBand5GhzStartFreqMhz) / 5 + kBand5GhzFirstChNum;
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} else if (freq_mhz >= kBand6GhzStartFreqMhz &&
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freq_mhz <= kBand6GhzEndFreqMhz) {
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if (freq_mhz == kBand6GhzOpClass136Ch2FreqMhz) {
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return 2;
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}
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return (freq_mhz - kBand6GhzStartFreqMhz) / 5 + kBand6GhzFirstChNum;
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} else if (freq_mhz >= kBand60GhzStartFreqMhz &&
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freq_mhz <= kBand60GhzEndFreqMhz) {
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return (freq_mhz - kBand60GhzStartFreqMhz) / 2160 + kBand60GhzFirstChNum;
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}
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return kUnspecified;
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}
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// Function to validate an IP address
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bool WifiUtils::ValidateIPV4(std::string ipv4) {
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int result;
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// split the string into tokens
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std::vector<absl::string_view> list = absl::StrSplit(ipv4, '.');
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// if the token size is not equal to four
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if (list.size() != 4) {
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return false;
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}
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// validate each token
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for (absl::string_view str : list) {
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// verify that the string is a number or not, and the numbers are in the
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// valid range
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if (!absl::SimpleAtoi(str, &result)) return false;
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if (result > 255 || result < 0) return false;
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}
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return true;
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}
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std::string WifiUtils::GetHumanReadableIpAddress(
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absl::string_view binary_address) {
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std::vector<std::string> parts;
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for (unsigned int b : binary_address) {
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parts.push_back(absl::StrFormat("%d", b));
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}
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return absl::StrJoin(parts, ".");
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}
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} // namespace nearby
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