86 lines
1.8 KiB
Rust
86 lines
1.8 KiB
Rust
use crate::marker::PhantomData;
|
|
use crate::slice;
|
|
|
|
#[repr(transparent)]
|
|
pub struct IoSlice<'a> {
|
|
vec: wasi::Ciovec,
|
|
_p: PhantomData<&'a [u8]>,
|
|
}
|
|
|
|
impl<'a> IoSlice<'a> {
|
|
#[inline]
|
|
pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
|
|
IoSlice {
|
|
vec: wasi::Ciovec {
|
|
buf: buf.as_ptr(),
|
|
buf_len: buf.len(),
|
|
},
|
|
_p: PhantomData,
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn advance(&mut self, n: usize) {
|
|
if self.vec.buf_len < n {
|
|
panic!("advancing IoSlice beyond its length");
|
|
}
|
|
|
|
unsafe {
|
|
self.vec.buf_len -= n;
|
|
self.vec.buf = self.vec.buf.add(n);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn as_slice(&self) -> &[u8] {
|
|
unsafe {
|
|
slice::from_raw_parts(self.vec.buf as *const u8, self.vec.buf_len)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[repr(transparent)]
|
|
pub struct IoSliceMut<'a> {
|
|
vec: wasi::Iovec,
|
|
_p: PhantomData<&'a mut [u8]>,
|
|
}
|
|
|
|
impl<'a> IoSliceMut<'a> {
|
|
#[inline]
|
|
pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
|
|
IoSliceMut {
|
|
vec: wasi::Iovec {
|
|
buf: buf.as_mut_ptr(),
|
|
buf_len: buf.len()
|
|
},
|
|
_p: PhantomData,
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn advance(&mut self, n: usize) {
|
|
if self.vec.buf_len < n {
|
|
panic!("advancing IoSlice beyond its length");
|
|
}
|
|
|
|
unsafe {
|
|
self.vec.buf_len -= n;
|
|
self.vec.buf = self.vec.buf.add(n);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn as_slice(&self) -> &[u8] {
|
|
unsafe {
|
|
slice::from_raw_parts(self.vec.buf as *const u8, self.vec.buf_len)
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn as_mut_slice(&mut self) -> &mut [u8] {
|
|
unsafe {
|
|
slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.buf_len)
|
|
}
|
|
}
|
|
}
|