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use std::cell::RefCell;
use std::vec::Vec;
use std::rc::Rc;
use std::io;
use Error;
use super::{sys, Device};
#[derive(Debug)]
pub struct TapInterface {
lower: Rc<RefCell<sys::TapInterfaceDesc>>,
mtu: usize
}
impl TapInterface {
pub fn new(name: &str) -> io::Result<TapInterface> {
let mut lower = try!(sys::TapInterfaceDesc::new(name));
try!(lower.attach_interface());
Ok(TapInterface {
lower: Rc::new(RefCell::new(lower)),
mtu: 1536
})
}
}
impl Device for TapInterface {
type RxBuffer = Vec<u8>;
type TxBuffer = TxBuffer;
fn mtu(&self) -> usize { self.mtu }
fn receive(&mut self) -> Result<Self::RxBuffer, Error> {
let mut lower = self.lower.borrow_mut();
let mut buffer = vec![0; self.mtu];
let size = lower.recv(&mut buffer[..]).unwrap();
buffer.resize(size, 0);
Ok(buffer)
}
fn transmit(&mut self, length: usize) -> Result<Self::TxBuffer, Error> {
Ok(TxBuffer {
lower: self.lower.clone(),
buffer: vec![0; length]
})
}
}
#[doc(hidden)]
pub struct TxBuffer {
lower: Rc<RefCell<sys::TapInterfaceDesc>>,
buffer: Vec<u8>
}
impl AsRef<[u8]> for TxBuffer {
fn as_ref(&self) -> &[u8] { self.buffer.as_ref() }
}
impl AsMut<[u8]> for TxBuffer {
fn as_mut(&mut self) -> &mut [u8] { self.buffer.as_mut() }
}
impl Drop for TxBuffer {
fn drop(&mut self) {
let mut lower = self.lower.borrow_mut();
lower.send(&mut self.buffer[..]).unwrap();
}
}