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use std::{mem, slice, u32};
// declare the types we need directly here to avoid bringing
// in the old and slow winapi 0.2 dependency.
type DWORD = u32;
type ULONG = u32;
type CHAR = i8;
#[repr(C)]
struct WSABUF {
pub len: ULONG,
pub buf: *mut CHAR,
}
pub struct IoVec {
inner: [u8],
}
pub const MAX_LENGTH: usize = u32::MAX as usize;
impl IoVec {
pub fn as_ref(&self) -> &[u8] {
unsafe {
let vec = self.wsabuf();
slice::from_raw_parts(vec.buf as *const u8, vec.len as usize)
}
}
pub fn as_mut(&mut self) -> &mut [u8] {
unsafe {
let vec = self.wsabuf();
slice::from_raw_parts_mut(vec.buf as *mut u8, vec.len as usize)
}
}
unsafe fn wsabuf(&self) -> WSABUF {
mem::transmute(&self.inner)
}
}
impl<'a> From<&'a [u8]> for &'a IoVec {
fn from(src: &'a [u8]) -> Self {
assert!(src.len() > 0);
assert!(src.len() <= MAX_LENGTH);
unsafe {
mem::transmute(WSABUF {
buf: src.as_ptr() as *mut _,
len: src.len() as DWORD,
})
}
}
}
impl<'a> From<&'a mut [u8]> for &'a mut IoVec {
fn from(src: &'a mut [u8]) -> Self {
assert!(src.len() > 0);
assert!(src.len() <= MAX_LENGTH);
unsafe {
mem::transmute(WSABUF {
buf: src.as_ptr() as *mut _,
len: src.len() as DWORD,
})
}
}
}
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