gemstone/bytes/
box_byte_slice.rs

1use super::*;
2use core::mem;
3use core::ops::{Deref, DerefMut};
4use std::alloc::{alloc_zeroed, dealloc, Layout};
5
6#[derive(Clone)]
7pub struct BoxByteSlice(mem::ManuallyDrop<Box<[u8]>>);
8
9impl BoxByteSlice {
10    #[inline]
11    pub fn new_zeroed(len: usize) -> Self {
12        let layout = Layout::from_size_align((len + 7) & !7, 8).unwrap();
13        unsafe {
14            BoxByteSlice(mem::ManuallyDrop::new(Box::from_raw(
15                core::slice::from_raw_parts_mut(alloc_zeroed(layout), len),
16            )))
17        }
18    }
19
20    #[inline]
21    pub fn as_byte_slice(&self) -> ByteSlice {
22        ByteSlice::new(&self[..])
23    }
24
25    #[inline]
26    pub fn as_byte_mut_slice(&mut self) -> ByteMutSlice {
27        ByteMutSlice::new(&mut self[..])
28    }
29}
30
31impl Deref for BoxByteSlice {
32    type Target = [u8];
33    #[inline]
34    fn deref(&self) -> &Self::Target {
35        &self.0
36    }
37}
38
39impl DerefMut for BoxByteSlice {
40    #[inline]
41    fn deref_mut(&mut self) -> &mut Self::Target {
42        &mut self.0
43    }
44}
45
46impl Drop for BoxByteSlice {
47    #[inline]
48    fn drop(&mut self) {
49        let layout = Layout::from_size_align((self.0.len() + 7) & !7, 8).unwrap();
50        unsafe {
51            dealloc(
52                Box::into_raw(mem::ManuallyDrop::take(&mut self.0)) as *mut u8,
53                layout,
54            )
55        }
56    }
57}
58
59impl_byteorder!(BoxByteSlice);
gemstone/bytes/box_byte_slice.rs

gemstone/bytes/
box_byte_slice.rs
