fidl_next_codec/wire/vec/
raw.rs

1// Copyright 2024 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use core::mem::MaybeUninit;
6use core::ptr::slice_from_raw_parts_mut;
7
8use munge::munge;
9
10use crate::{WirePointer, WireU64, ZeroPadding};
11
12#[repr(C)]
13pub struct RawWireVector<T> {
14    pub len: WireU64,
15    pub ptr: WirePointer<T>,
16}
17
18unsafe impl<T> ZeroPadding for RawWireVector<T> {
19    #[inline]
20    fn zero_padding(_: &mut MaybeUninit<Self>) {
21        // Wire vectors have no padding bytes
22    }
23}
24
25// SAFETY: `RawWireVector` doesn't add any restrictions on sending across thread boundaries, and so
26// is `Send` if `T` is `Send`.
27unsafe impl<T: Send> Send for RawWireVector<T> {}
28
29// SAFETY: `RawWireVector` doesn't add any interior mutability, so it is `Sync` if `T` is `Sync`.
30unsafe impl<T: Sync> Sync for RawWireVector<T> {}
31
32impl<T> RawWireVector<T> {
33    pub fn encode_present(out: &mut MaybeUninit<Self>, len: u64) {
34        munge!(let Self { len: encoded_len, ptr } = out);
35        encoded_len.write(WireU64(len));
36        WirePointer::encode_present(ptr);
37    }
38
39    pub fn encode_absent(out: &mut MaybeUninit<Self>) {
40        munge!(let Self { len, ptr } = out);
41        len.write(WireU64(0));
42        WirePointer::encode_absent(ptr);
43    }
44
45    pub fn len(&self) -> u64 {
46        *self.len
47    }
48
49    pub fn as_ptr(&self) -> *mut T {
50        self.ptr.as_ptr()
51    }
52
53    pub fn as_slice_ptr(&self) -> *mut [T] {
54        slice_from_raw_parts_mut(self.as_ptr(), self.len() as usize)
55    }
56}
fidl_next_codec/wire/vec/raw.rs

fidl_next_codec/wire/vec/
raw.rs
