122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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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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* http://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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*/
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#include "DeviceFileReader.h"
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namespace android {
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namespace hardware {
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namespace gnss {
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namespace common {
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void DeviceFileReader::getDataFromDeviceFile(const std::string& command, int mMinIntervalMs) {
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char inputBuffer[INPUT_BUFFER_SIZE];
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std::string deviceFilePath = "";
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if (command == CMD_GET_LOCATION) {
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deviceFilePath = ReplayUtils::getFixedLocationPath();
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} else if (command == CMD_GET_RAWMEASUREMENT) {
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deviceFilePath = ReplayUtils::getGnssPath();
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} else {
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// Invalid command
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return;
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}
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int gnss_fd, epoll_fd;
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if ((gnss_fd = open(deviceFilePath.c_str(), O_RDWR | O_NONBLOCK)) == -1) {
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return;
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}
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if (write(gnss_fd, command.c_str(), command.size()) <= 0) {
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close(gnss_fd);
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return;
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}
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// Create an epoll instance.
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if ((epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
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close(gnss_fd);
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return;
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}
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// Add file descriptor to epoll instance.
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struct epoll_event ev, events[1];
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memset(&ev, 0, sizeof(ev));
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ev.data.fd = gnss_fd;
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ev.events = EPOLLIN;
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if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, gnss_fd, &ev) == -1) {
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close(gnss_fd);
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close(epoll_fd);
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return;
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}
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// Wait for device file event.
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if (epoll_wait(epoll_fd, events, 1, mMinIntervalMs) == -1) {
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close(gnss_fd);
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close(epoll_fd);
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return;
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}
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// Handle event and write data to string buffer.
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int bytes_read = -1;
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std::string inputStr = "";
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while (true) {
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memset(inputBuffer, 0, INPUT_BUFFER_SIZE);
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bytes_read = read(gnss_fd, &inputBuffer, INPUT_BUFFER_SIZE);
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if (bytes_read <= 0) {
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break;
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}
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s_buffer_ += std::string(inputBuffer, bytes_read);
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}
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close(gnss_fd);
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close(epoll_fd);
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// Trim end of file mark(\n\n\n\n).
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auto pos = s_buffer_.find("\n\n\n\n");
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if (pos != std::string::npos) {
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inputStr = s_buffer_.substr(0, pos);
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s_buffer_ = s_buffer_.substr(pos + 4);
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} else {
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return;
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}
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// Cache the injected data.
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if (command == CMD_GET_LOCATION) {
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// TODO validate data
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data_[CMD_GET_LOCATION] = inputStr;
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} else if (command == CMD_GET_RAWMEASUREMENT) {
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if (ReplayUtils::isGnssRawMeasurement(inputStr)) {
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data_[CMD_GET_RAWMEASUREMENT] = inputStr;
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}
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}
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}
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std::string DeviceFileReader::getLocationData() {
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std::unique_lock<std::mutex> lock(mMutex);
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getDataFromDeviceFile(CMD_GET_LOCATION, 20);
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return data_[CMD_GET_LOCATION];
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}
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std::string DeviceFileReader::getGnssRawMeasurementData() {
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std::unique_lock<std::mutex> lock(mMutex);
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getDataFromDeviceFile(CMD_GET_RAWMEASUREMENT, 20);
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return data_[CMD_GET_RAWMEASUREMENT];
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}
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DeviceFileReader::DeviceFileReader() {}
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DeviceFileReader::~DeviceFileReader() {}
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} // namespace common
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} // namespace gnss
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} // namespace hardware
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} // namespace android
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