use std::{slice, ptr};
use std::mem;
#[inline(always)]
pub unsafe fn unsafe_slice<'a>(buf: &'a [u8], start: usize, new_len: usize) -> &'a [u8] {
debug_assert!(start <= buf.len());
debug_assert!(new_len <= (buf.len() - start));
slice::from_raw_parts(buf.as_ptr().offset(start as isize), new_len)
}
#[inline(always)]
pub unsafe fn unsafe_slice_mut<'a>(buf: &'a mut [u8], start: usize, new_len: usize) -> &'a mut [u8] {
debug_assert!(start <= buf.len());
debug_assert!(new_len <= (buf.len() - start));
slice::from_raw_parts_mut(buf.as_mut_ptr().offset(start as isize), new_len)
}
#[inline(always)]
pub unsafe fn copy_and_advance(dest: &mut *mut u8, src: &[u8]) {
ptr::copy_nonoverlapping(src.as_ptr(), *dest, src.len());
*dest = dest.offset(src.len() as isize)
}
#[inline(always)]
pub unsafe fn copy_lifetime_mut<'a, S: ?Sized, T: ?Sized + 'a>
(_ptr: &'a mut S, ptr: &mut T) -> &'a mut T {
mem::transmute(ptr)
}
#[inline(always)]
pub unsafe fn copy_lifetime<'a, S: ?Sized, T: ?Sized + 'a>
(_ptr: &'a S, ptr: &T) -> &'a T {
mem::transmute(ptr)
}
#[derive(Copy, Clone)]
pub struct NonZeroUsize(&'static u8);
impl NonZeroUsize {
#[inline]
pub unsafe fn new(value: usize) -> Self {
debug_assert!(value != 0);
NonZeroUsize(&*(value as *const u8))
}
#[inline]
pub fn get(self) -> usize {
self.0 as *const u8 as usize
}
}