fidl_next_protocol/
wire.rs

Help
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 fidl_next_codec::{
6    Decode, DecodeError, Encodable, Encode, EncodeError, Slot, WireU32, WireU64, ZeroPadding,
7};
8
9use zerocopy::IntoBytes;
10
11/// A FIDL protocol message header
12#[derive(Clone, Copy, Debug, IntoBytes)]
13#[repr(C)]
14pub struct WireMessageHeader {
15    /// The transaction ID of the message header
16    pub txid: WireU32,
17    /// Flags
18    pub flags: [u8; 3],
19    /// Magic number
20    pub magic_number: u8,
21    /// The ordinal of the message following this header
22    pub ordinal: WireU64,
23}
24
25unsafe impl ZeroPadding for WireMessageHeader {
26    #[inline]
27    unsafe fn zero_padding(_: *mut Self) {
28        // Wire message headers have no padding
29    }
30}
31
32/// The flag 0 bit indicating that the wire format is v2.
33pub const FLAG_0_WIRE_FORMAT_V2_BIT: u8 = 0b0000_0010;
34
35/// The magic number indicating FIDL protocol compatibility.
36pub const MAGIC_NUMBER: u8 = 0x01;
37
38impl Encodable for WireMessageHeader {
39    type Encoded = WireMessageHeader;
40}
41
42impl<E: ?Sized> Encode<E> for WireMessageHeader {
43    #[inline]
44    fn encode(&mut self, _: &mut E, mut slot: Slot<'_, Self::Encoded>) -> Result<(), EncodeError> {
45        slot.write(*self);
46        Ok(())
47    }
48}
49
50unsafe impl<D: ?Sized> Decode<D> for WireMessageHeader {
51    #[inline]
52    fn decode(_: Slot<'_, Self>, _: &mut D) -> Result<(), DecodeError> {
53        Ok(())
54    }
55}
fidl_next_protocol/wire.rs

fidl_next_protocol/
wire.rs
