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use crate::io::{AsyncRead, ReadBuf};
use bytes::Buf;
use pin_project_lite::pin_project;
use std::future::Future;
use std::io;
use std::io::ErrorKind::UnexpectedEof;
use std::marker::PhantomPinned;
use std::mem::size_of;
use std::pin::Pin;
use std::task::{Context, Poll};
macro_rules! reader {
($name:ident, $ty:ty, $reader:ident) => {
reader!($name, $ty, $reader, size_of::<$ty>());
};
($name:ident, $ty:ty, $reader:ident, $bytes:expr) => {
pin_project! {
#[doc(hidden)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct $name<R> {
#[pin]
src: R,
buf: [u8; $bytes],
read: u8,
// Make this future `!Unpin` for compatibility with async trait methods.
#[pin]
_pin: PhantomPinned,
}
}
impl<R> $name<R> {
pub(crate) fn new(src: R) -> Self {
$name {
src,
buf: [0; $bytes],
read: 0,
_pin: PhantomPinned,
}
}
}
impl<R> Future for $name<R>
where
R: AsyncRead,
{
type Output = io::Result<$ty>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut me = self.project();
if *me.read == $bytes as u8 {
return Poll::Ready(Ok(Buf::$reader(&mut &me.buf[..])));
}
while *me.read < $bytes as u8 {
let mut buf = ReadBuf::new(&mut me.buf[*me.read as usize..]);
*me.read += match me.src.as_mut().poll_read(cx, &mut buf) {
Poll::Pending => return Poll::Pending,
Poll::Ready(Err(e)) => return Poll::Ready(Err(e.into())),
Poll::Ready(Ok(())) => {
let n = buf.filled().len();
if n == 0 {
return Poll::Ready(Err(UnexpectedEof.into()));
}
n as u8
}
};
}
let num = Buf::$reader(&mut &me.buf[..]);
Poll::Ready(Ok(num))
}
}
};
}
macro_rules! reader8 {
($name:ident, $ty:ty) => {
pin_project! {
/// Future returned from `read_u8`
#[doc(hidden)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct $name<R> {
#[pin]
reader: R,
// Make this future `!Unpin` for compatibility with async trait methods.
#[pin]
_pin: PhantomPinned,
}
}
impl<R> $name<R> {
pub(crate) fn new(reader: R) -> $name<R> {
$name {
reader,
_pin: PhantomPinned,
}
}
}
impl<R> Future for $name<R>
where
R: AsyncRead,
{
type Output = io::Result<$ty>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let me = self.project();
let mut buf = [0; 1];
let mut buf = ReadBuf::new(&mut buf);
match me.reader.poll_read(cx, &mut buf) {
Poll::Pending => Poll::Pending,
Poll::Ready(Err(e)) => Poll::Ready(Err(e.into())),
Poll::Ready(Ok(())) => {
if buf.filled().len() == 0 {
return Poll::Ready(Err(UnexpectedEof.into()));
}
Poll::Ready(Ok(buf.filled()[0] as $ty))
}
}
}
}
};
}
reader8!(ReadU8, u8);
reader8!(ReadI8, i8);
reader!(ReadU16, u16, get_u16);
reader!(ReadU32, u32, get_u32);
reader!(ReadU64, u64, get_u64);
reader!(ReadU128, u128, get_u128);
reader!(ReadI16, i16, get_i16);
reader!(ReadI32, i32, get_i32);
reader!(ReadI64, i64, get_i64);
reader!(ReadI128, i128, get_i128);
reader!(ReadF32, f32, get_f32);
reader!(ReadF64, f64, get_f64);
reader!(ReadU16Le, u16, get_u16_le);
reader!(ReadU32Le, u32, get_u32_le);
reader!(ReadU64Le, u64, get_u64_le);
reader!(ReadU128Le, u128, get_u128_le);
reader!(ReadI16Le, i16, get_i16_le);
reader!(ReadI32Le, i32, get_i32_le);
reader!(ReadI64Le, i64, get_i64_le);
reader!(ReadI128Le, i128, get_i128_le);
reader!(ReadF32Le, f32, get_f32_le);
reader!(ReadF64Le, f64, get_f64_le);