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use crate::{Decoder, Encoder};
use bytes::{BufMut, BytesMut};
use std::io::{Error, ErrorKind};
use memchr::memchr;
pub struct LinesCodec {}
impl Encoder for LinesCodec {
type Item = String;
type Error = Error;
fn encode(&mut self, item: Self::Item, dst: &mut BytesMut) -> Result<(), Self::Error> {
dst.reserve(item.len());
dst.put(item);
Ok(())
}
}
impl Decoder for LinesCodec {
type Item = String;
type Error = Error;
fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
match memchr(b'\n', src) {
Some(pos) => {
let buf = src.split_to(pos + 1);
String::from_utf8(buf.to_vec())
.map(Some)
.map_err(|e| Error::new(ErrorKind::InvalidData, e))
}
_ => Ok(None),
}
}
}