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