78 lines
2 KiB
Rust
78 lines
2 KiB
Rust
use crate::object::ObjectId;
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use crate::utils::buffd::buf_out::{BufFdOut, MsgFds};
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use std::mem;
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use std::mem::MaybeUninit;
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use uapi::OwnedFd;
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pub struct WlFormatter<'a> {
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buf: &'a mut BufFdOut,
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pos: usize,
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fds: Vec<OwnedFd>,
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}
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impl<'a> WlFormatter<'a> {
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pub fn new(buf: &'a mut BufFdOut) -> Self {
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Self {
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pos: buf.out_pos,
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buf,
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fds: vec![],
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}
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}
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pub fn int(&mut self, int: i32) -> &mut Self {
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self.buf.write(uapi::as_maybe_uninit_bytes(&int));
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self
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}
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pub fn uint(&mut self, int: u32) -> &mut Self {
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self.buf.write(uapi::as_maybe_uninit_bytes(&int));
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self
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}
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pub fn fixed(&mut self, fixed: f64) -> &mut Self {
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let int = (fixed * 256.0) as i32;
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self.buf.write(uapi::as_maybe_uninit_bytes(&int));
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self
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}
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pub fn string(&mut self, s: &str) -> &mut Self {
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let len = s.len() + 1;
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let cap = (len + 3) & !3;
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self.uint(len as u32);
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self.buf.write(uapi::as_maybe_uninit_bytes(s.as_bytes()));
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let none = [MaybeUninit::new(0); 4];
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self.buf.write(&none[..cap - len + 1]);
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self
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}
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pub fn fd(&mut self, fd: OwnedFd) -> &mut Self {
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self.fds.push(fd);
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self
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}
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pub fn object(&mut self, obj: ObjectId) -> &mut Self {
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self.uint(obj.raw())
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}
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pub fn header(&mut self, obj: ObjectId, event: u32) -> &mut Self {
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self.object(obj).uint(event)
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}
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}
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impl<'a> Drop for WlFormatter<'a> {
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fn drop(&mut self) {
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assert!(self.buf.out_pos - self.pos >= 8);
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assert_eq!(self.pos % 4, 0);
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unsafe {
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let second_ptr = (self.buf.out_buf as *mut u8).add(self.pos + 4) as *mut u32;
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let len = ((self.buf.out_pos - self.pos) as u32) << 16;
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*second_ptr |= len;
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}
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if self.fds.len() > 0 {
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self.buf.fds.push_back(MsgFds {
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pos: self.pos,
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fds: mem::take(&mut self.fds),
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})
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}
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}
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}
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