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use crate::constants::EventType;
use crate::inputid::{BusType, InputId};
use crate::{sys, AttributeSetRef, InputEvent, Key, RelativeAxisType, SwitchType};
use libc::O_NONBLOCK;
use std::fs::{File, OpenOptions};
use std::io::{self, Write};
use std::os::unix::{fs::OpenOptionsExt, io::AsRawFd};
const UINPUT_PATH: &str = "/dev/uinput";
#[derive(Debug)]
pub struct VirtualDeviceBuilder<'a> {
file: File,
name: &'a [u8],
id: Option<libc::input_id>,
}
impl<'a> VirtualDeviceBuilder<'a> {
pub fn new() -> io::Result<Self> {
let mut options = OpenOptions::new();
let file = options
.write(true)
.custom_flags(O_NONBLOCK)
.open(UINPUT_PATH)?;
Ok(VirtualDeviceBuilder {
file,
name: Default::default(),
id: None,
})
}
#[inline]
pub fn name<S: AsRef<[u8]> + ?Sized>(mut self, name: &'a S) -> Self {
self.name = name.as_ref();
self
}
#[inline]
pub fn input_id(mut self, id: InputId) -> Self {
self.id = Some(id.0);
self
}
pub fn with_keys(self, keys: &AttributeSetRef<Key>) -> io::Result<Self> {
unsafe {
sys::ui_set_evbit(
self.file.as_raw_fd(),
crate::EventType::KEY.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
for bit in keys.iter() {
unsafe {
sys::ui_set_keybit(
self.file.as_raw_fd(),
bit.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
}
Ok(self)
}
pub fn with_relative_axes(self, axes: &AttributeSetRef<RelativeAxisType>) -> io::Result<Self> {
unsafe {
sys::ui_set_evbit(
self.file.as_raw_fd(),
crate::EventType::RELATIVE.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
for bit in axes.iter() {
unsafe {
sys::ui_set_relbit(
self.file.as_raw_fd(),
bit.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
}
Ok(self)
}
pub fn with_switches(self, switches: &AttributeSetRef<SwitchType>) -> io::Result<Self> {
unsafe {
sys::ui_set_evbit(
self.file.as_raw_fd(),
crate::EventType::SWITCH.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
for bit in switches.iter() {
unsafe {
sys::ui_set_swbit(
self.file.as_raw_fd(),
bit.0 as nix::sys::ioctl::ioctl_param_type,
)?;
}
}
Ok(self)
}
pub fn build(self) -> io::Result<VirtualDevice> {
let mut usetup = libc::uinput_setup {
id: self.id.unwrap_or(DEFAULT_ID),
name: [0; libc::UINPUT_MAX_NAME_SIZE],
ff_effects_max: 0,
};
let name_bytes = unsafe { &*(self.name as *const [u8] as *const [libc::c_char]) };
assert!(name_bytes.len() + 1 < libc::UINPUT_MAX_NAME_SIZE);
usetup.name[..name_bytes.len()].copy_from_slice(name_bytes);
VirtualDevice::new(self.file, &usetup)
}
}
const DEFAULT_ID: libc::input_id = libc::input_id {
bustype: BusType::BUS_USB.0,
vendor: 0x1234,
product: 0x5678,
version: 0x111,
};
pub struct VirtualDevice {
file: File,
}
impl VirtualDevice {
fn new(file: File, usetup: &libc::uinput_setup) -> io::Result<Self> {
unsafe { sys::ui_dev_setup(file.as_raw_fd(), usetup)? };
unsafe { sys::ui_dev_create(file.as_raw_fd())? };
Ok(VirtualDevice { file })
}
#[inline]
fn write_raw(&mut self, messages: &[InputEvent]) -> io::Result<()> {
let bytes = unsafe { crate::cast_to_bytes(messages) };
self.file.write_all(bytes)
}
pub fn emit(&mut self, messages: &[InputEvent]) -> io::Result<()> {
self.write_raw(messages)?;
let syn = InputEvent::new(EventType::SYNCHRONIZATION, 0, 0);
self.write_raw(&[syn])?;
Ok(())
}
}