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use std::{borrow::Cow, convert::TryFrom, fmt, time::Duration};
use crate::error::{RequestError, ResponseError};
pub trait Device {
type Info: DeviceInfo;
fn send(&self, data: &[u8]) -> Result<(), RequestError>;
fn receive<'a>(
&self,
buffer: &'a mut [u8],
timeout: Option<Duration>,
) -> Result<&'a [u8], ResponseError>;
}
#[cfg(feature = "hidapi")]
impl Device for hidapi::HidDevice {
type Info = hidapi::DeviceInfo;
fn send(&self, data: &[u8]) -> Result<(), RequestError> {
let n = self
.write(data)
.map_err(|err| RequestError::PacketSendingFailed(err.into()))?;
if n == data.len() {
Ok(())
} else {
Err(RequestError::IncompleteWrite)
}
}
fn receive<'a>(
&self,
buffer: &'a mut [u8],
timeout: Option<Duration>,
) -> Result<&'a [u8], ResponseError> {
let duration = if let Some(timeout) = timeout {
i32::try_from(timeout.as_millis())
.map_err(|err| ResponseError::PacketReceivingFailed(err.into()))?
} else {
-1
};
let n = self
.read_timeout(buffer, duration)
.map_err(|err| ResponseError::PacketReceivingFailed(err.into()))?;
if n == buffer.len() {
Ok(&buffer[1..n])
} else if n == 0 {
Err(ResponseError::Timeout)
} else {
Ok(&buffer[..n])
}
}
}
pub trait DeviceInfo: fmt::Debug {
fn packet_size(&self) -> usize {
64
}
fn vendor_id(&self) -> u16;
fn product_id(&self) -> u16;
fn path(&self) -> Cow<'_, str>;
}
#[cfg(feature = "hidapi")]
impl DeviceInfo for hidapi::DeviceInfo {
fn vendor_id(&self) -> u16 {
hidapi::DeviceInfo::vendor_id(self)
}
fn product_id(&self) -> u16 {
hidapi::DeviceInfo::product_id(self)
}
fn path(&self) -> Cow<'_, str> {
String::from_utf8_lossy(hidapi::DeviceInfo::path(self).to_bytes())
}
}