97 lines
2.7 KiB
Rust
97 lines
2.7 KiB
Rust
use crate::object::ObjectId;
|
|
use crate::utils::buffd::buf_out::{BufFdOut, MsgFds};
|
|
use std::mem;
|
|
use std::mem::MaybeUninit;
|
|
use uapi::OwnedFd;
|
|
|
|
pub struct MsgFormatter<'a> {
|
|
buf: &'a mut BufFdOut,
|
|
pos: usize,
|
|
fds: &'a mut Vec<OwnedFd>,
|
|
}
|
|
|
|
impl<'a> MsgFormatter<'a> {
|
|
pub fn new(buf: &'a mut BufFdOut, fds: &'a mut Vec<OwnedFd>) -> Self {
|
|
Self {
|
|
pos: buf.out_pos,
|
|
buf,
|
|
fds,
|
|
}
|
|
}
|
|
|
|
pub fn int(&mut self, int: i32) -> &mut Self {
|
|
self.buf.write(uapi::as_maybe_uninit_bytes(&int));
|
|
self
|
|
}
|
|
|
|
pub fn uint(&mut self, int: u32) -> &mut Self {
|
|
self.buf.write(uapi::as_maybe_uninit_bytes(&int));
|
|
self
|
|
}
|
|
|
|
pub fn fixed(&mut self, fixed: f64) -> &mut Self {
|
|
let int = (fixed * 256.0) as i32;
|
|
self.buf.write(uapi::as_maybe_uninit_bytes(&int));
|
|
self
|
|
}
|
|
|
|
pub fn string(&mut self, s: &str) -> &mut Self {
|
|
let len = s.len() + 1;
|
|
let cap = (len + 3) & !3;
|
|
self.uint(len as u32);
|
|
self.buf.write(uapi::as_maybe_uninit_bytes(s.as_bytes()));
|
|
let none = [MaybeUninit::new(0); 4];
|
|
self.buf.write(&none[..cap - len + 1]);
|
|
self
|
|
}
|
|
|
|
pub fn fd(&mut self, fd: OwnedFd) -> &mut Self {
|
|
self.fds.push(fd);
|
|
self
|
|
}
|
|
|
|
pub fn object<T: Into<ObjectId>>(&mut self, obj: T) -> &mut Self {
|
|
self.uint(obj.into().raw())
|
|
}
|
|
|
|
pub fn header<T: Into<ObjectId>>(&mut self, obj: T, event: u32) -> &mut Self {
|
|
self.object(obj).uint(event)
|
|
}
|
|
|
|
pub fn array<F: FnOnce(&mut MsgFormatter<'_>)>(&mut self, f: F) -> &mut Self {
|
|
let pos = self.buf.out_pos;
|
|
self.uint(0);
|
|
let len = {
|
|
let mut fmt = MsgFormatter {
|
|
buf: self.buf,
|
|
pos,
|
|
fds: self.fds,
|
|
};
|
|
f(&mut fmt);
|
|
let len = self.buf.out_pos - pos + 4;
|
|
let none = [MaybeUninit::new(0); 4];
|
|
self.buf.write(&none[..self.buf.out_pos.wrapping_neg() & 3]);
|
|
len as u32
|
|
};
|
|
unsafe {
|
|
(*self.buf.out_buf)[pos..pos + 4].copy_from_slice(uapi::as_maybe_uninit_bytes(&len));
|
|
}
|
|
self
|
|
}
|
|
|
|
pub fn write_len(self) {
|
|
assert!(self.buf.out_pos - self.pos >= 8);
|
|
assert_eq!(self.pos % 4, 0);
|
|
unsafe {
|
|
let second_ptr = (self.buf.out_buf as *mut u8).add(self.pos + 4) as *mut u32;
|
|
let len = ((self.buf.out_pos - self.pos) as u32) << 16;
|
|
*second_ptr |= len;
|
|
}
|
|
if self.fds.len() > 0 {
|
|
self.buf.fds.push_back(MsgFds {
|
|
pos: self.pos,
|
|
fds: mem::take(self.fds),
|
|
})
|
|
}
|
|
}
|
|
}
|