/
writer.rs
73 lines (60 loc) · 2.42 KB
/
writer.rs
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use std::io::{Result, Write};
use crate::fixed::FixedInt;
use crate::varint::VarInt;
#[cfg(feature = "tokio_async")]
use tokio::io::{AsyncWrite, AsyncWriteExt};
#[cfg(feature = "futures_async")]
use futures_util::{io::AsyncWrite, io::AsyncWriteExt};
/// A trait for writing integers in VarInt encoding to any `Write` type. This packs encoding and
/// writing into one step.
pub trait VarIntWriter {
fn write_varint<VI: VarInt>(&mut self, n: VI) -> Result<usize>;
}
/// Like VarIntWriter, but asynchronous.
#[cfg(any(feature = "tokio_async", feature = "futures_async"))]
#[async_trait::async_trait]
pub trait VarIntAsyncWriter {
/// Write a VarInt integer to an asynchronous writer.
async fn write_varint_async<VI: VarInt + Send>(&mut self, n: VI) -> Result<usize>;
}
#[cfg(any(feature = "tokio_async", feature = "futures_async"))]
#[async_trait::async_trait]
impl<AW: AsyncWrite + Send + Unpin> VarIntAsyncWriter for AW {
async fn write_varint_async<VI: VarInt + Send>(&mut self, n: VI) -> Result<usize> {
let mut buf = [0 as u8; 10];
let b = n.encode_var(&mut buf);
self.write(&buf[0..b]).await
}
}
impl<Inner: Write> VarIntWriter for Inner {
fn write_varint<VI: VarInt>(&mut self, n: VI) -> Result<usize> {
let mut buf = [0 as u8; 10];
let used = n.encode_var(&mut buf[..]);
self.write(&buf[0..used])
}
}
/// A trait for writing integers without encoding (i.e. `FixedInt`) to any `Write` type.
pub trait FixedIntWriter {
fn write_fixedint<FI: FixedInt>(&mut self, n: FI) -> Result<usize>;
}
#[cfg(any(feature = "tokio_async", feature = "futures_async"))]
#[async_trait::async_trait]
pub trait FixedIntAsyncWriter {
async fn write_fixedint_async<FI: FixedInt + Send>(&mut self, n: FI) -> Result<usize>;
}
#[cfg(any(feature = "tokio_async", feature = "futures_async"))]
#[async_trait::async_trait]
impl<AW: AsyncWrite + Unpin + Send> FixedIntAsyncWriter for AW {
async fn write_fixedint_async<FI: FixedInt + Send>(&mut self, n: FI) -> Result<usize> {
let mut buf = [0 as u8; 8];
n.encode_fixed(&mut buf[0..FI::required_space()]);
self.write(&buf[0..FI::required_space()]).await
}
}
impl<W: Write> FixedIntWriter for W {
fn write_fixedint<FI: FixedInt>(&mut self, n: FI) -> Result<usize> {
let mut buf = [0 as u8; 8];
n.encode_fixed(&mut buf[0..FI::required_space()]);
self.write(&buf[0..FI::required_space()])
}
}