103 lines
2.7 KiB
Rust
103 lines
2.7 KiB
Rust
use {
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crate::buf_out::{MsgFds, OUT_BUF_SIZE, OutBuffer, OutBufferMeta},
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jay_wire_types::EiObjectId,
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std::{mem, rc::Rc},
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uapi::OwnedFd,
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};
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pub struct EiMsgFormatter<'a> {
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buf: &'a mut [u8],
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meta: &'a mut OutBufferMeta,
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pos: usize,
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fds: &'a mut Vec<Rc<OwnedFd>>,
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}
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impl<'a> EiMsgFormatter<'a> {
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pub fn new(buf: &'a mut OutBuffer, fds: &'a mut Vec<Rc<OwnedFd>>) -> Self {
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Self {
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pos: buf.meta.write_pos,
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buf: &mut buf.buf[..],
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fds,
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meta: &mut buf.meta,
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}
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}
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fn write(&mut self, bytes: &[u8]) {
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if bytes.len() > OUT_BUF_SIZE - self.meta.write_pos {
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panic!("Out buffer overflow");
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}
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self.buf[self.meta.write_pos..self.meta.write_pos + bytes.len()].copy_from_slice(bytes);
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self.meta.write_pos += bytes.len();
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}
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pub fn int(&mut self, int: i32) -> &mut Self {
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self.write(uapi::as_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.write(uapi::as_bytes(&int));
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self
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}
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pub fn long(&mut self, int: i64) -> &mut Self {
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self.write(uapi::as_bytes(&int));
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self
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}
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pub fn ulong(&mut self, int: u64) -> &mut Self {
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self.write(uapi::as_bytes(&int));
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self
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}
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pub fn float(&mut self, f: f32) -> &mut Self {
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self.write(uapi::as_bytes(&f));
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self
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}
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pub fn optstr<S: AsRef<[u8]> + ?Sized>(&mut self, s: Option<&S>) -> &mut Self {
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match s {
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Some(s) => self.string(s),
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_ => self.uint(0),
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}
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}
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pub fn string<S: AsRef<[u8]> + ?Sized>(&mut self, s: &S) -> &mut Self {
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let s = s.as_ref();
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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.write(uapi::as_bytes(s));
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let none = [0; 4];
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self.write(&none[..cap - len + 1]);
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self
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}
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pub fn fd(&mut self, fd: Rc<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<T: Into<EiObjectId>>(&mut self, obj: T) -> &mut Self {
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self.ulong(obj.into().raw())
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}
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pub fn header<T: Into<EiObjectId>>(&mut self, obj: T, event: u32) -> &mut Self {
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self.object(obj).uint(0).uint(event)
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}
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pub fn write_len(self) {
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assert!(self.meta.write_pos - self.pos >= 16);
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assert_eq!(self.pos % 4, 0);
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unsafe {
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let second_ptr = self.buf.as_ptr().add(self.pos + 8) as *mut u32;
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*second_ptr = (self.meta.write_pos - self.pos) as u32;
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}
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if self.fds.len() > 0 {
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self.meta.fds.push_back(MsgFds {
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pos: self.pos,
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fds: mem::take(self.fds),
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})
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}
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}
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}
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