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use crate::codec::decoder::Decoder;
use crate::codec::encoder::Encoder;
use bytes::{BufMut, Bytes, BytesMut};
use std::io;
/// A simple [`Decoder`] and [`Encoder`] implementation that just ships bytes around.
///
/// [`Decoder`]: crate::codec::Decoder
/// [`Encoder`]: crate::codec::Encoder
///
/// # Example
///
/// Turn an [`AsyncRead`] into a stream of `Result<`[`BytesMut`]`, `[`Error`]`>`.
///
/// [`AsyncRead`]: tokio::io::AsyncRead
/// [`BytesMut`]: bytes::BytesMut
/// [`Error`]: std::io::Error
///
/// ```
/// # mod hidden {
/// # #[allow(unused_imports)]
/// use tokio::fs::File;
/// # }
/// use tokio::io::AsyncRead;
/// use tokio_util::codec::{FramedRead, BytesCodec};
///
/// # enum File {}
/// # impl File {
/// # async fn open(_name: &str) -> Result<impl AsyncRead, std::io::Error> {
/// # use std::io::Cursor;
/// # Ok(Cursor::new(vec![0, 1, 2, 3, 4, 5]))
/// # }
/// # }
/// #
/// # #[tokio::main(flavor = "current_thread")]
/// # async fn main() -> Result<(), std::io::Error> {
/// let my_async_read = File::open("filename.txt").await?;
/// let my_stream_of_bytes = FramedRead::new(my_async_read, BytesCodec::new());
/// # Ok(())
/// # }
/// ```
///
#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Default)]
pub struct BytesCodec(());
impl BytesCodec {
/// Creates a new `BytesCodec` for shipping around raw bytes.
pub fn new() -> BytesCodec {
BytesCodec(())
}
}
impl Decoder for BytesCodec {
type Item = BytesMut;
type Error = io::Error;
fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<BytesMut>, io::Error> {
if !buf.is_empty() {
let len = buf.len();
Ok(Some(buf.split_to(len)))
} else {
Ok(None)
}
}
}
impl Encoder<Bytes> for BytesCodec {
type Error = io::Error;
fn encode(&mut self, data: Bytes, buf: &mut BytesMut) -> Result<(), io::Error> {
buf.reserve(data.len());
buf.put(data);
Ok(())
}
}
impl Encoder<BytesMut> for BytesCodec {
type Error = io::Error;
fn encode(&mut self, data: BytesMut, buf: &mut BytesMut) -> Result<(), io::Error> {
buf.reserve(data.len());
buf.put(data);
Ok(())
}
}