lzfse_rust/ops/
patch_into.rs

1use crate::types::Idx;
2
3use super::pos::Pos;
4
5pub trait PatchInto: Pos {
6    /// Expose `len` bytes at `pos` allowing us to write directly into the writer.
7    /// Bounds violations panic.
8    /// Patching to greater than `i32::MAX` relative to `self.pos()` is undefined.
9    ///
10    /// * `S::SHORT_LIMIT <= Self::SHORT_LIMIT`
11    #[must_use]
12    fn patch_into(&mut self, pos: Idx, len: usize) -> &mut [u8];
13
14    #[inline(always)]
15    fn patch_bytes(&mut self, pos: Idx, bytes: &[u8]) {
16        self.patch_into(pos, bytes.len()).copy_from_slice(bytes);
17    }
18}
19
20impl PatchInto for Vec<u8> {
21    #[inline(always)]
22    fn patch_into(&mut self, pos: Idx, len: usize) -> &mut [u8] {
23        let delta = self.pos() - pos;
24        let position = (self.len() as isize - delta as isize) as usize;
25        &mut self[position..position + len]
26    }
27}
28
29impl<T: PatchInto + ?Sized> PatchInto for &mut T {
30    #[inline(always)]
31    fn patch_into(&mut self, pos: Idx, len: usize) -> &mut [u8] {
32        (**self).patch_into(pos, len)
33    }
34
35    #[inline(always)]
36    fn patch_bytes(&mut self, pos: Idx, bytes: &[u8]) {
37        (**self).patch_bytes(pos, bytes)
38    }
39}
lzfse_rust/ops/patch_into.rs

lzfse_rust/ops/
patch_into.rs
