fusio 0.6.0

Fusio provides lean, minimal cost abstraction and extensible Read / Write trait to multiple storage on multiple poll-based / completion-based async runtime.
Documentation 
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//! Implementations of the traits in the `fusio` crate.

pub mod buffered;
#[cfg(feature = "fs")]
pub mod disk;
#[cfg(feature = "fs")]
pub mod mem;
pub mod remotes;

use std::{future::Future, io::Cursor};

use crate::{error::Error, IoBufMut, MaybeSend, Read};

pub trait SeqRead: MaybeSend {
    fn read_exact<B: IoBufMut>(
        &mut self,
        buf: B,
    ) -> impl Future<Output = (Result<(), Error>, B)> + MaybeSend;
}

impl<R: SeqRead> SeqRead for &mut R {
    fn read_exact<B: IoBufMut>(
        &mut self,
        buf: B,
    ) -> impl Future<Output = (Result<(), Error>, B)> + MaybeSend {
        R::read_exact(self, buf)
    }
}

impl<R: Read> SeqRead for Cursor<R> {
    async fn read_exact<B: IoBufMut>(&mut self, buf: B) -> (Result<(), Error>, B) {
        let pos = self.position();
        let result = self.get_mut().read_exact_at(buf, pos).await;
        self.set_position(pos + result.1.bytes_init() as u64);
        result
    }
}