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use std::{io::Read, sync::Arc};
use crate::DEFAULT_BUFFER_LEN;
macro_rules! impl_decode {
($type: ty) => {
impl Decode for $type {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized,
{
const BYTES: usize = (<$type>::BITS / 8) as usize;
let mut bytes = [0; BYTES];
reader.read_exact(&mut bytes)?;
Ok(<$type>::from_be_bytes(bytes))
}
}
};
}
pub trait Decode {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized;
}
impl Decode for bool {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized,
{
let mut byte = [0_u8];
reader.read_exact(&mut byte)?;
Ok(byte[0] != 0)
}
}
impl Decode for Arc<[u8]> {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self> {
let mut buf = Vec::with_capacity(DEFAULT_BUFFER_LEN);
reader.read_to_end(&mut buf)?;
Ok(Arc::<[u8]>::from(buf.into_boxed_slice()))
}
}
impl<const S: usize> Decode for [u8; S] {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized,
{
let mut slice = [0_u8; S];
reader.read_exact(&mut slice)?;
Ok(slice)
}
}
impl_decode!(u8);
impl_decode!(u16);
impl_decode!(u32);
impl_decode!(u64);
impl_decode!(u128);
impl_decode!(usize);
impl_decode!(i8);
impl_decode!(i16);
impl_decode!(i32);
impl_decode!(i64);
impl_decode!(i128);
impl_decode!(isize);
impl Decode for f64 {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized,
{
let bits = u64::decode(reader)?;
let value = f64::from_bits(bits);
Ok(value)
}
}
impl Decode for f32 {
fn decode(reader: &mut dyn Read) -> crate::codec::error::Result<Self>
where
Self: Sized,
{
let bits = u32::decode(reader)?;
let value = f32::from_bits(bits);
Ok(value)
}
}
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