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Created crate, interface and failing test.

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[package]
name = "framed"
version = "0.1.0"
description = "Send and receive frames (arrays of bytes of varied size) over streams of bytes."
authors = ["Alex Helfet <alex.helfet@gmail.com>"]
categories = ["embedded", "encoding", "network-programming"]
keywords = ["no_std", "networking", "datalink", "protocol", "embedded"]
readme = "README.md"
license = "MIT OR Apache-2.0"
repository = "https://github.com/fluffysquirrels/framed"
[dependencies]
error-chain = "^0.11.0"

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Copyright (c) 2016 Alex Helfet
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# framed-rs
Rust crate to send and receive frames over streams of bytes.
# `framed`
Rust crate to send and receive frames (arrays of bytes of varied size)
over streams of bytes.
See [rustdoc on docs.rs](https://docs.rs/crate/framed)
## License
Licensed under either of
- Apache License, Version 2.0 (<LICENSE-APACHE> or
<http://www.apache.org/licenses/LICENSE-2.0>)
- MIT license (<LICENSE-MIT> or <http://opensource.org/licenses/MIT>)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the
Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.

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//! Representations of errors returned by this crate.
use std::io;
error_chain! {
foreign_links {
Io(io::Error);
}
errors {
UnknownHeader(b: u8) {
description("unknown header byte"),
display("unknown header byte: {:x}", b),
}
EofDuringPacket {
description("end of file during packet"),
display("end of file during packet"),
}
EofBeforePacket {
description("end of file before packet"),
display("end of file before packet"),
}
}
}

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//! Sending and receiving frames (slices of bytes of varied length).
//!
//! Conforming to / inspired by the [data link layer][dll] or layer 2
//! in the OSI networking model, this module enables sending slices of
//! bytes of definite length over an underlying transport that only
//! supports sending an unstructured stream of bytes (a [physical
//! layer][pl], such as ITM, UART or SPI).
//!
//! [dll]: https://en.wikipedia.org/wiki/Data_link_layer
//! [pl]: https://en.wikipedia.org/wiki/Physical_layer
// TODO: Make this work when no_std.
#![deny(warnings)]
#![feature(conservative_impl_trait)]
#[macro_use]
extern crate error_chain;
pub mod error;
use error::{Result};
use std::io::{Read, Write};
/// Sends frames over an underlying `io::Write` instance.
pub struct Sender<W: Write> {
_w: W,
}
impl<W: Write> Sender<W> {
pub fn new(w: W) -> Sender<W> {
Sender::<W> {
_w: w,
}
}
pub fn send(&mut self, _f: &[u8]) -> Result<()> {
unimplemented!();
}
}
/// Receives frames from an underlying `io::Read` instance.
pub struct Receiver<R: Read> {
_r: R,
}
impl<R: Read> Receiver<R> {
pub fn new(r: R) -> Receiver<R> {
Receiver::<R> {
_r: r,
}
}
pub fn recv(&mut self) -> Result<Vec<u8>> {
unimplemented!();
}
}
#[cfg(test)]
mod tests {
use std::io::{Read, Write};
use super::{Receiver, Sender};
#[test]
fn one_frame() {
let (mut tx, mut rx) = pair();
let sent = [0x00, 0x01, 0x02];
tx.send(&sent).unwrap();
let recvd = rx.recv().unwrap();
assert_eq!(recvd, sent);
}
fn pair() -> (Sender<impl Write>, Receiver<impl Read>) {
let c = Channel::new();
let tx = Sender::new(c.writer());
let rx = Receiver::new(c.reader());
(tx, rx)
}
use self::channel::Channel;
mod channel {
use std::io::{Read, Result, Write};
use std::rc::Rc;
/// A Vec-backed buffer that can be read from and written to.
pub struct Channel {
inner: Rc<Inner>,
}
struct Inner {
_v: Vec<u8>,
_read_pos: usize,
}
pub struct Reader {
_inner: Rc<Inner>,
}
pub struct Writer {
_inner: Rc<Inner>,
}
impl Channel {
pub fn new() -> Channel {
Channel {
inner: Rc::new(Inner {
_v: Vec::new(),
_read_pos: 0
})
}
}
pub fn reader(&self) -> Reader {
Reader {
_inner: self.inner.clone(),
}
}
pub fn writer(&self) -> Writer {
Writer {
_inner: self.inner.clone(),
}
}
}
impl Read for Reader {
fn read(&mut self, _buf: &mut [u8]) -> Result<usize> {
unimplemented!()
}
}
impl Write for Writer {
fn write(&mut self, _buf: &[u8]) -> Result<usize> {
unimplemented!()
}
fn flush(&mut self) -> Result<()> {
unimplemented!()
}
}
}
}