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#![deny(
missing_docs,
trivial_numeric_casts,
unstable_features,
unused_extern_crates,
unused_features
)]
#![warn(unused_import_braces, unused_parens)]
#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
#![cfg_attr(
feature = "cargo-clippy",
allow(clippy::new_without_default, clippy::new_without_default)
)]
#![cfg_attr(
feature = "cargo-clippy",
warn(
clippy::float_arithmetic,
clippy::mut_mut,
clippy::nonminimal_bool,
clippy::option_map_unwrap_or,
clippy::option_map_unwrap_or_else,
clippy::unicode_not_nfc,
clippy::use_self
)
)]
use std::io;
use std::io::Result;
pub struct Comm {
id: i32,
}
impl io::Read for Comm {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
read(self.id, buf)
}
}
impl io::Write for Comm {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
write(self.id, buf)
}
fn flush(&mut self) -> Result<()> {
Ok(())
}
}
#[cfg(all(target_arch = "wasm32"))]
extern "C" {
fn _read(id: i32, payload: *const u8, payload_len: u32, ln: *mut i32) -> u32;
fn _write(id: i32, payload: *const u8, payload_len: u32, ln: *mut i32) -> u32;
}
#[cfg(not(target_arch = "wasm32"))]
unsafe fn _read(_id: i32, _payload: *const u8, payload_len: u32, ln: *mut i32) -> u32 {
*ln = payload_len as i32;
return 0;
}
#[cfg(not(target_arch = "wasm32"))]
unsafe fn _write(_id: i32, _payload: *const u8, payload_len: u32, ln: *mut i32) -> u32 {
*ln = payload_len as i32;
return 0;
}
fn read(id: i32, payload: &mut [u8]) -> Result<usize> {
let mut ln: i32 = 0;
let ln_ptr: *mut i32 = &mut ln;
let err = unsafe { _read(id, payload.as_ptr(), payload.len() as u32, ln_ptr) };
println!("read err {:?}", err);
Ok(ln as usize)
}
fn write(id: i32, payload: &[u8]) -> Result<usize> {
let mut ln: i32 = 0;
let ln_ptr: *mut i32 = &mut ln;
let err = unsafe { _write(id, payload.as_ptr(), payload.len() as u32, ln_ptr) };
println!("read err {:?}", err);
Ok(ln as usize)
}
pub fn run(to_run: fn(Comm) -> io::Result<()>) {
let c = Comm { id: 1 };
to_run(c).unwrap();
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}