socketcan_alt/
frame.rs

1mod data;
2mod error;
3mod fd_data;
4mod id;
5mod remote;
6
7use crate::sys;
8pub use data::DataFrame;
9pub use error::ErrorFrame;
10pub use fd_data::FdDataFrame;
11pub use id::Id;
12pub use remote::RemoteFrame;
13use std::mem::{size_of, size_of_val, MaybeUninit};
14use std::os::raw::c_void;
15
16#[non_exhaustive]
17#[derive(Clone, Copy, Debug)]
18#[cfg_attr(test, derive(PartialEq))]
19pub enum Frame {
20    Data(DataFrame),
21    FdData(FdDataFrame),
22    Remote(RemoteFrame),
23    #[doc(hidden)]
24    Error(ErrorFrame),
25}
26
27impl Frame {
28    pub(crate) unsafe fn from_raw(
29        frame: MaybeUninit<sys::canfd_frame>,
30        size: usize,
31    ) -> Option<Self> {
32        if size == size_of::<sys::can_frame>() {
33            let inner = *(frame.as_ptr() as *const sys::can_frame);
34            if inner.can_id & sys::CAN_RTR_FLAG != 0 {
35                Some(Self::Remote(RemoteFrame(inner)))
36            } else if inner.can_id & sys::CAN_ERR_FLAG != 0 {
37                Some(Self::Error(ErrorFrame(inner)))
38            } else {
39                Some(Self::Data(DataFrame(inner)))
40            }
41        } else if size == size_of::<sys::canfd_frame>() {
42            let inner = frame.assume_init();
43            assert_eq!(inner.can_id & (sys::CAN_RTR_FLAG | sys::CAN_ERR_FLAG), 0);
44            Some(Self::FdData(FdDataFrame(inner)))
45        } else {
46            None
47        }
48    }
49
50    pub(crate) fn as_ptr(&self) -> *const c_void {
51        match self {
52            Self::Data(DataFrame(inner))
53            | Self::Remote(RemoteFrame(inner))
54            | Self::Error(ErrorFrame(inner)) => inner as *const _ as _,
55            Self::FdData(FdDataFrame(inner)) => inner as *const _ as _,
56        }
57    }
58
59    pub(crate) fn size(&self) -> usize {
60        match self {
61            Self::Data(DataFrame(inner))
62            | Self::Remote(RemoteFrame(inner))
63            | Self::Error(ErrorFrame(inner)) => size_of_val(inner),
64            Self::FdData(FdDataFrame(inner)) => size_of_val(inner),
65        }
66    }
67}
68
69#[cfg(test)]
70mod tests;
socketcan_alt/frame.rs

socketcan_alt/
frame.rs
