| 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(), |
| }) |
| } |
| } |
| } |