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use crate::marker::PhantomData;
use crate::slice;
use crate::sys::c;
#[derive(Copy, Clone)]
#[repr(transparent)]
pub struct IoSlice<'a> {
vec: c::WSABUF,
_p: PhantomData<&'a [u8]>,
}
impl<'a> IoSlice<'a> {
#[inline]
pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
assert!(buf.len() <= c::ULONG::MAX as usize);
IoSlice {
vec: c::WSABUF {
len: buf.len() as c::ULONG,
buf: buf.as_ptr() as *mut u8 as *mut c::CHAR,
},
_p: PhantomData,
}
}
#[inline]
pub fn advance(&mut self, n: usize) {
if (self.vec.len as usize) < n {
panic!("advancing IoSlice beyond its length");
}
unsafe {
self.vec.len -= n as c::ULONG;
self.vec.buf = self.vec.buf.add(n);
}
}
#[inline]
pub fn as_slice(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize) }
}
}
#[repr(transparent)]
pub struct IoSliceMut<'a> {
vec: c::WSABUF,
_p: PhantomData<&'a mut [u8]>,
}
impl<'a> IoSliceMut<'a> {
#[inline]
pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
assert!(buf.len() <= c::ULONG::MAX as usize);
IoSliceMut {
vec: c::WSABUF { len: buf.len() as c::ULONG, buf: buf.as_mut_ptr() as *mut c::CHAR },
_p: PhantomData,
}
}
#[inline]
pub fn advance(&mut self, n: usize) {
if (self.vec.len as usize) < n {
panic!("advancing IoSliceMut beyond its length");
}
unsafe {
self.vec.len -= n as c::ULONG;
self.vec.buf = self.vec.buf.add(n);
}
}
#[inline]
pub fn as_slice(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self.vec.buf as *mut u8, self.vec.len as usize) }
}
#[inline]
pub fn as_mut_slice(&mut self) -> &mut [u8] {
unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.len as usize) }
}
}
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