android_device_xiaomi_sm8450-common/sensors/sensor-notifier/utils/SensorNotifierUtils.cpp

/*
 * Copyright (C) 2024 The LineageOS Project
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define LOG_TAG "SensorNotifierUtils"

#include "SensorNotifierUtils.h"

#include <android-base/logging.h>

bool readBool(int fd) {
    char c;
    int rc;

    rc = lseek(fd, 0, SEEK_SET);
    if (rc) {
        LOG(ERROR) << "failed to seek fd, err: " << rc;
        return false;
    }

    rc = read(fd, &c, sizeof(char));
    if (rc != 1) {
        LOG(ERROR) << "failed to read bool from fd, err: " << rc;
        return false;
    }

    return c != '0';
}

disp_event_resp* parseDispEvent(int fd) {
    disp_event header;
    ssize_t headerSize = read(fd, &header, sizeof(header));
    if (headerSize < sizeof(header)) {
        LOG(ERROR) << "unexpected display event header size: " << headerSize;
        return nullptr;
    }

    struct disp_event_resp* response =
            reinterpret_cast<struct disp_event_resp*>(malloc(header.length));
    response->base = header;

    int dataLength = response->base.length - sizeof(response->base);
    if (dataLength < 0) {
        LOG(ERROR) << "invalid data length: " << response->base.length;
        return nullptr;
    }

    ssize_t dataSize = read(fd, &response->data, dataLength);
    if (dataSize < dataLength) {
        LOG(ERROR) << "unexpected display event data size: " << dataSize;
        return nullptr;
    }

    return response;
}