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use std::{mem, slice, usize};
#[derive(Clone)]
pub struct WasmIoVec {
ptr: *const u8,
len: usize,
}
pub struct IoVec {
inner: [u8],
}
pub const MAX_LENGTH: usize = usize::MAX;
impl IoVec {
pub fn as_ref(&self) -> &[u8] {
unsafe {
let vec = self.iovec();
slice::from_raw_parts(vec.ptr as *const u8, vec.len)
}
}
pub fn as_mut(&mut self) -> &mut [u8] {
unsafe {
let vec = self.iovec();
slice::from_raw_parts_mut(vec.ptr as *mut u8, vec.len)
}
}
unsafe fn iovec(&self) -> WasmIoVec {
mem::transmute(&self.inner)
}
}
impl<'a> From<&'a [u8]> for &'a IoVec {
fn from(src: &'a [u8]) -> Self {
assert!(src.len() > 0);
unsafe {
mem::transmute(WasmIoVec {
ptr: src.as_ptr() as *mut _,
len: src.len(),
})
}
}
}
impl<'a> From<&'a mut [u8]> for &'a mut IoVec {
fn from(src: &'a mut [u8]) -> Self {
assert!(src.len() > 0);
unsafe {
mem::transmute(WasmIoVec {
ptr: src.as_ptr() as *mut _,
len: src.len(),
})
}
}
}