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