exfat/io/
mod.rs

1#[cfg(all(feature = "async", not(feature = "std")))]
2use alloc::boxed::Box;
3
4#[cfg(feature = "async")]
5use async_trait::async_trait;
6
7use crate::error::Error;
8use crate::types::SectorID;
9
10pub type Block = [u8; 512];
11
12pub(crate) fn flatten(sector: &[Block]) -> &[u8] {
13    unsafe { core::slice::from_raw_parts(&sector[0][0], sector.len() * 512) }
14}
15
16#[cfg_attr(feature = "async", async_trait)]
17#[cfg_attr(not(feature = "async"), deasync::deasync)]
18pub trait IO {
19    type Error: core::fmt::Debug;
20    /// Default to 9, which means 512B
21    fn set_sector_size_shift(&mut self, shift: u8) -> Result<(), Self::Error>;
22    async fn read<'a>(&'a mut self, id: SectorID) -> Result<&'a [Block], Self::Error>;
23    /// Caller guarantees bytes.len() <= SECTOR_SIZE - offset
24    async fn write(&mut self, id: SectorID, offset: usize, data: &[u8]) -> Result<(), Self::Error>;
25    async fn flush(&mut self) -> Result<(), Self::Error>;
26}
27
28pub(crate) struct IOWrapper<IO>(IO);
29
30impl<IO> IOWrapper<IO> {
31    pub(crate) fn new(io: IO) -> Self {
32        Self(io)
33    }
34
35    pub(crate) fn unwrap(self) -> IO {
36        self.0
37    }
38}
39
40#[cfg_attr(not(feature = "async"), deasync::deasync)]
41impl<E, T: IO<Error = E>> IOWrapper<T> {
42    pub(crate) async fn read<'a>(&'a mut self, sector: SectorID) -> Result<&'a [Block], Error<E>> {
43        self.0.read(sector).await.map_err(|e| Error::IO(e))
44    }
45
46    pub(crate) async fn write(
47        &mut self,
48        id: SectorID,
49        offset: usize,
50        data: &[u8],
51    ) -> Result<(), Error<E>> {
52        let result = self.0.write(id, offset, data).await;
53        result.map_err(|e| Error::IO(e))
54    }
55
56    pub(crate) async fn flush(&mut self) -> Result<(), Error<E>> {
57        self.0.flush().await.map_err(|e| Error::IO(e))
58    }
59}
60
61#[cfg(feature = "std")]
62pub mod std;
exfat/io/mod.rs

exfat/io/
mod.rs
