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// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::collections::VecDeque;
use std::io::{self, Read, Write};
use std::iter::ExactSizeIterator;
use std::os::unix::io::{AsRawFd, RawFd};
use std::os::unix::net::UnixStream;
const EVENT_SIZE: usize = 4;
const EVENT_BUFFER_LEN_MAX: usize = 16 * EVENT_SIZE;
const EV_SYN: u16 = 0x00;
const EV_KEY: u16 = 0x01;
const EV_REL: u16 = 0x02;
const EV_ABS: u16 = 0x03;
const SYN_REPORT: u16 = 0;
const REL_X: u16 = 0x00;
const REL_Y: u16 = 0x01;
const ABS_X: u16 = 0x00;
const ABS_Y: u16 = 0x01;
// /// Half-way build `EventDevice` with only the `event_socket` defined. Finish building the
// /// `EventDevice` by using `status_socket`.
// pub struct PartialEventDevice(UnixStream);
// impl PartialEventDevice {
// /// Finish build `EventDevice` by providing the `status_socket`.
// pub fn status_socket(self, status_socket: UnixStream) -> EventDevice {
// EventDevice {
// event_socket: self.0,
// status_socket,
// }
// }
// }
#[derive(Copy, Clone, PartialEq, Eq)]
pub enum EventDeviceKind {
/// Produces relative mouse motions, wheel, and button clicks while the real mouse is captured.
Mouse,
/// Produces absolute motion and touch events from the display window's events.
Touchscreen,
/// Produces key events while the display window has focus.
Keyboard,
}
#[derive(Copy, Clone, Default, PartialEq, Eq, Debug)]
pub struct EventEncoded {
pub type_: u16,
pub code: u16,
pub value: u32,
}
impl EventEncoded {
#[inline]
pub fn syn() -> EventEncoded {
EventEncoded {
type_: EV_SYN,
code: SYN_REPORT,
value: 0,
}
}
#[inline]
pub fn absolute(code: u16, value: u32) -> EventEncoded {
EventEncoded {
type_: EV_ABS,
code,
value,
}
}
#[inline]
pub fn absolute_x(x: u32) -> EventEncoded {
Self::absolute(ABS_X, x)
}
#[inline]
pub fn absolute_y(y: u32) -> EventEncoded {
Self::absolute(ABS_Y, y)
}
#[inline]
pub fn key(code: u16, pressed: bool) -> EventEncoded {
EventEncoded {
type_: EV_KEY,
code,
value: if pressed { 1 } else { 0 },
}
}
#[inline]
pub fn from_bytes(v: [u8; 8]) -> EventEncoded {
EventEncoded {
type_: u16::from_le_bytes([v[0], v[1]]),
code: u16::from_le_bytes([v[2], v[3]]),
value: u32::from_le_bytes([v[4], v[5], v[6], v[7]]),
}
}
#[inline]
pub fn to_bytes(&self) -> [u8; 8] {
let a = self.type_.to_le_bytes();
let b = self.code.to_le_bytes();
let c = self.value.to_le_bytes();
[a[0], a[1], b[0], b[1], c[0], c[1], c[2], c[3]]
}
}
/// Encapsulates a virtual event device, such as a mouse or keyboard
pub struct EventDevice {
kind: EventDeviceKind,
event_buffer: VecDeque<u8>,
event_socket: UnixStream,
}
impl EventDevice {
pub fn new(kind: EventDeviceKind, event_socket: UnixStream) -> EventDevice {
let _ = event_socket.set_nonblocking(true);
EventDevice {
kind,
event_buffer: Default::default(),
event_socket,
}
}
#[inline]
pub fn mouse(event_socket: UnixStream) -> EventDevice {
Self::new(EventDeviceKind::Mouse, event_socket)
}
#[inline]
pub fn touchscreen(event_socket: UnixStream) -> EventDevice {
Self::new(EventDeviceKind::Touchscreen, event_socket)
}
#[inline]
pub fn keyboard(event_socket: UnixStream) -> EventDevice {
Self::new(EventDeviceKind::Keyboard, event_socket)
}
#[inline]
pub fn kind(&self) -> EventDeviceKind {
self.kind
}
/// Flushes the buffered events that did not fit into the underlying transport, if any.
///
/// Returns `Ok(true)` if, after this function returns, there all the buffer of events is
/// empty.
pub fn flush_buffered_events(&mut self) -> io::Result<bool> {
while !self.event_buffer.is_empty() {
let written = self.event_socket.write(&self.event_buffer.as_slices().0)?;
if written == 0 {
return Ok(false);
}
self.event_buffer.drain(..written);
}
Ok(true)
}
pub fn is_buffered_events_empty(&self) -> bool {
self.event_buffer.is_empty()
}
pub fn send_report<E: IntoIterator<Item = EventEncoded>>(
&mut self,
events: E,
) -> io::Result<bool>
where
E::IntoIter: ExactSizeIterator,
{
let it = events.into_iter();
if self.event_buffer.len() > (EVENT_BUFFER_LEN_MAX - EVENT_SIZE * (it.len() + 1)) {
return Ok(false);
}
for event in it {
let bytes = event.to_bytes();
self.event_buffer.extend(bytes.iter());
}
self.event_buffer
.extend(EventEncoded::syn().to_bytes().iter());
self.flush_buffered_events()
}
/// Sends the given `event`, returning `Ok(true)` if, after this function returns, there are no
/// buffered events remaining.
pub fn send_event_encoded(&mut self, event: EventEncoded) -> io::Result<bool> {
if !self.flush_buffered_events()? {
return Ok(false);
}
let bytes = event.to_bytes();
let written = self.event_socket.write(&bytes)?;
if written == bytes.len() {
return Ok(true);
}
if self.event_buffer.len() <= (EVENT_BUFFER_LEN_MAX - EVENT_SIZE) {
self.event_buffer.extend(bytes[written..].iter());
}
Ok(false)
}
pub fn recv_event_encoded(&self) -> io::Result<EventEncoded> {
let mut event_bytes = [0; 8];
(&self.event_socket).read_exact(&mut event_bytes)?;
Ok(EventEncoded::from_bytes(event_bytes))
}
}
impl AsRawFd for EventDevice {
fn as_raw_fd(&self) -> RawFd {
self.event_socket.as_raw_fd()
}
}
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