72 lines
1.8 KiB
Rust
72 lines
1.8 KiB
Rust
use {
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crate::xcon::Message,
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std::rc::Rc,
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uapi::{AssertPacked, OwnedFd, Packed},
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};
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pub struct Formatter<'a> {
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fds: &'a mut Vec<Rc<OwnedFd>>,
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buf: &'a mut Vec<u8>,
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ext_opcode: u8,
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}
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impl<'a> Formatter<'a> {
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pub fn new(fds: &'a mut Vec<Rc<OwnedFd>>, buf: &'a mut Vec<u8>, ext_opcode: u8) -> Self {
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Self {
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fds,
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buf,
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ext_opcode,
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}
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}
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pub fn ext_opcode(&self) -> u8 {
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self.ext_opcode
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}
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pub fn pad(&mut self, pad: usize) {
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static BUF: [u8; 8] = [0; 8];
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self.buf.extend_from_slice(&BUF[..pad]);
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}
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pub fn pad_to(&mut self, size: usize) {
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static BUF: [u8; 8] = [0; 8];
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while self.buf.len() < size {
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let len = (size - self.buf.len()).min(8);
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self.buf.extend_from_slice(&BUF[..len]);
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}
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}
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pub fn align(&mut self, alignment: usize) {
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static BUF: [u8; 8] = [0; 8];
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let len = self.buf.len().wrapping_neg() & (alignment - 1);
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self.buf.extend_from_slice(&BUF[..len]);
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}
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pub fn write_packed<T: Packed + ?Sized>(&mut self, t: &T) {
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self.buf.extend_from_slice(uapi::as_bytes(t));
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}
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pub fn write_list<'b, T: Message<'b>>(&mut self, t: &[T]) {
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if T::IS_POD {
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self.buf
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.extend_from_slice(uapi::as_bytes(unsafe { AssertPacked::new(t) }));
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} else {
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for t in t {
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t.serialize(self);
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}
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}
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}
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pub fn write_bytes(&mut self, b: &[u8]) {
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self.buf.extend_from_slice(b);
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}
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pub fn write_request_length(&mut self) {
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let len: u16 = (self.buf.len() / 4) as u16;
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self.buf[2..4].copy_from_slice(&len.to_ne_bytes());
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}
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pub fn add_fd(&mut self, fd: &Rc<OwnedFd>) {
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self.fds.push(fd.clone());
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}
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}
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