Jeremy Soller
39 lines
1.0 KiB
Rust
39 lines
1.0 KiB
Rust
use std::io::{Read, Seek, SeekFrom, Write};
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use syscall::error::{Error, Result, EIO};
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use crate::disk::Disk;
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use crate::BLOCK_SIZE;
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macro_rules! try_disk {
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($expr:expr) => {
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match $expr {
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Ok(val) => val,
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Err(err) => {
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eprintln!("Disk I/O Error: {}", err);
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return Err(Error::new(EIO));
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}
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}
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};
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}
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pub struct DiskIo<T>(pub T);
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impl<T: Read + Write + Seek> Disk for DiskIo<T> {
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unsafe fn read_at(&mut self, block: u64, buffer: &mut [u8]) -> Result<usize> {
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try_disk!(self.0.seek(SeekFrom::Start(block * BLOCK_SIZE)));
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let count = try_disk!(self.0.read(buffer));
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Ok(count)
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}
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unsafe fn write_at(&mut self, block: u64, buffer: &[u8]) -> Result<usize> {
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try_disk!(self.0.seek(SeekFrom::Start(block * BLOCK_SIZE)));
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let count = try_disk!(self.0.write(buffer));
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Ok(count)
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}
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fn size(&mut self) -> Result<u64> {
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let size = try_disk!(self.0.seek(SeekFrom::End(0)));
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Ok(size)
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}
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}
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