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use std::{ffi::OsStr, os::unix::ffi::OsStrExt};
use crate::{proto, util::OutputChain};
use crate::fuse::{private_trait::Sealed, Done, Operation, Reply, Request};
use super::FromRequest;
pub enum Readlink {}
pub enum Read {}
pub enum Write {}
pub enum Flush {}
pub struct WriteState {
size: u32,
}
impl Sealed for Readlink {}
impl Sealed for Read {}
impl Sealed for Write {}
impl Sealed for Flush {}
impl<'o> Operation<'o> for Readlink {
type RequestBody = ();
type ReplyTail = ();
}
impl<'o> Operation<'o> for Read {
type RequestBody = &'o proto::ReadIn;
type ReplyTail = ();
}
impl<'o> Operation<'o> for Write {
type RequestBody = (&'o proto::WriteIn, &'o [u8]);
type ReplyTail = WriteState;
}
impl<'o> Operation<'o> for Flush {
type RequestBody = &'o proto::FlushIn;
type ReplyTail = ();
}
impl<'o> Reply<'o, Readlink> {
/// This inode corresponds to a symbolic link pointing to the given target path.
pub fn target<T: AsRef<OsStr>>(self, target: T) -> Done<'o> {
self.chain(OutputChain::tail(&[target.as_ref().as_bytes()]))
}
/// Same as [`Reply::target()`], except that the target path is taken from disjoint
/// slices. This involves no additional allocation.
pub fn gather_target(self, target: &[&[u8]]) -> Done<'o> {
self.chain(OutputChain::tail(target))
}
}
impl<'o> Request<'o, Read> {
pub fn handle(&self) -> u64 {
self.body.fh
}
pub fn offset(&self) -> u64 {
self.body.offset
}
pub fn size(&self) -> u32 {
self.body.size
}
}
impl<'o> Reply<'o, Read> {
pub fn slice(self, data: &[u8]) -> Done<'o> {
self.chain(OutputChain::tail(&[data]))
}
}
impl<'o> Request<'o, Write> {
pub fn handle(&self) -> u64 {
self.body.0.fh
}
pub fn offset(&self) -> u64 {
self.body.0.offset
}
pub fn data(&self) -> &[u8] {
self.body.1
}
}
impl<'o> Reply<'o, Write> {
pub fn all(self) -> Done<'o> {
let size = self.tail.size;
self.single(&proto::WriteOut {
size,
padding: Default::default(),
})
}
}
impl<'o> Request<'o, Flush> {
pub fn handle(&self) -> u64 {
self.body.fh
}
}
impl<'o> Reply<'o, Flush> {
pub fn ok(self) -> Done<'o> {
self.empty()
}
}
impl<'o> FromRequest<'o, Write> for WriteState {
fn from_request(request: &Request<'o, Write>) -> Self {
let (body, data) = request.body;
if body.size as usize != data.len() {
log::warn!(
"Write size={} differs from data.len={}",
body.size,
data.len()
);
}
WriteState { size: body.size }
}
}
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