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|
use std::time::Duration;
use libc::c_int;
use sys::*;
use error::{self, Error};
/// A device handle.
pub struct Handle {
ptr: *mut hid_device,
}
impl Handle {
#[doc(hidden)]
pub unsafe fn new(ptr: *mut hid_device) -> Self {
Handle {
ptr: ptr,
}
}
#[doc(hidden)]
pub unsafe fn as_ptr(&self) -> *const hid_device {
self.ptr as *const _
}
#[doc(hidden)]
pub unsafe fn as_mut_ptr(&mut self) -> *mut hid_device {
self.ptr
}
}
impl Handle {
/// Set the handle in blocking or non-blocking mode.
pub fn blocking(&mut self, value: bool) -> error::Result<&mut Self> {
unsafe {
match hid_set_nonblocking(self.as_mut_ptr(), if value { 1 } else { 0 }) {
0 =>
Ok(self),
_ =>
Err(Error::General)
}
}
}
/// The data accessor.
pub fn data(&mut self) -> Data {
unsafe {
Data::new(self)
}
}
/// The feature accessor.
pub fn feature(&mut self) -> Feature {
unsafe {
Feature::new(self)
}
}
}
/// The data accessor.
pub struct Data<'a> {
handle: &'a mut Handle,
}
impl<'a> Data<'a> {
#[doc(hidden)]
pub unsafe fn new(handle: &mut Handle) -> Data {
Data { handle: handle }
}
/// Write data to the device.
///
/// The first byte must be the report ID.
pub fn write<T: AsRef<[u8]>>(&mut self, data: T) -> error::Result<usize> {
let data = data.as_ref();
unsafe {
match hid_write(self.handle.as_mut_ptr(), data.as_ptr(), data.len()) {
-1 =>
Err(Error::Write),
length =>
Ok(length as usize)
}
}
}
/// Write data to the device with the given report ID.
pub fn write_to<T: AsRef<[u8]>>(&mut self, id: u8, data: T) -> error::Result<usize> {
let data = data.as_ref();
let mut buffer = vec![0u8; data.len() + 1];
buffer[0] = id;
(&mut buffer[1 ..]).copy_from_slice(data);
self.write(&buffer)
}
/// Read data from the device.
///
/// If the device supports reports the first byte will contain the report ID.
///
/// Returns the amount of read bytes or `None` if there was a timeout.
pub fn read<T: AsMut<[u8]>>(&mut self, mut data: T, timeout: Duration) -> error::Result<Option<usize>> {
let data = data.as_mut();
let result = if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
unsafe {
hid_read(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len())
}
}
else {
unsafe {
// Timeout is in milliseconds.
hid_read_timeout(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len(),
timeout.as_secs() as c_int * 1_000 + timeout.subsec_nanos() as c_int / 1_000_000)
}
};
match result {
-1 =>
Err(Error::Read),
0 =>
Ok(None),
v =>
Ok(Some(v as usize))
}
}
/// Read data from the device.
///
/// Returns the report ID and the amount of read bytes or `None` if there was a timeout.
pub fn read_from<T: AsMut<[u8]>>(&mut self, mut data: T, timeout: Duration) -> error::Result<Option<(u8, usize)>> {
let data = data.as_mut();
let mut buffer = Vec::with_capacity(data.len() + 1);
if let Some(length) = self.read(&mut buffer, timeout)? {
data[0..length - 1].copy_from_slice(&buffer[1..length]);
Ok(Some((buffer[0], length - 1)))
}
else {
Ok(None)
}
}
}
/// The feature accessor.
pub struct Feature<'a> {
handle: &'a mut Handle,
}
impl<'a> Feature<'a> {
#[doc(hidden)]
pub unsafe fn new(handle: &mut Handle) -> Feature {
Feature { handle: handle }
}
/// Send a feature request.
///
/// The first byte must be the report ID.
pub fn send<T: AsRef<[u8]>>(&mut self, data: T) -> error::Result<usize> {
let data = data.as_ref();
unsafe {
match hid_send_feature_report(self.handle.as_mut_ptr(), data.as_ptr(), data.len()) {
-1 =>
Err(Error::Write),
length =>
Ok(length as usize)
}
}
}
/// Send a feature request to the given report ID.
pub fn send_to<T: AsRef<[u8]>>(&mut self, id: u8, data: T) -> error::Result<usize> {
let data = data.as_ref();
let mut buffer = Vec::with_capacity(data.len() + 1);
buffer.push(id);
buffer.extend(data);
self.send(&buffer).map(|v| v - 1)
}
/// Get a feature request.
///
/// The first byte must be the report ID.
pub fn get<T: AsMut<[u8]>>(&mut self, mut data: T) -> error::Result<usize> {
let data = data.as_mut();
unsafe {
match hid_get_feature_report(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len()) {
-1 =>
Err(Error::Read),
length =>
Ok(length as usize)
}
}
}
/// Get a feature request from the given report ID.
pub fn get_from<T: AsMut<[u8]>>(&mut self, id: u8, mut data: T) -> error::Result<usize> {
let data = data.as_mut();
let mut buffer = vec![0u8; data.len() + 1];
buffer[0] = id;
let length = self.get(&mut buffer)?;
data[0..length - 1].copy_from_slice(&buffer[1..length]);
Ok(length - 1)
}
}
impl Drop for Handle {
fn drop(&mut self) {
unsafe {
hid_close(self.as_mut_ptr());
}
}
}
|
