veloren/plugin/rt/src/lib.rs

#![feature(const_fn)]

pub use plugin_api as api;
pub use plugin_derive::*;

use serde::de::DeserializeOwned;
use serde::Serialize;

extern "C" {
    fn send_action(ptr: *const u8, len: usize);
}

pub fn send_actions(action: Vec<api::Action>) {
    let ret = bincode::serialize(&action).unwrap();
    unsafe {
        send_action(ret.as_ptr(), ret.len());
    }
}

pub fn read_input<T>(ptr: i32, len: u32) -> Result<T, &'static str> where T: DeserializeOwned{
    let slice = unsafe {
        ::std::slice::from_raw_parts(ptr as _, len as _)
    };
    bincode::deserialize(slice).map_err(|_|"Failed to deserialize function input")
}

pub fn write_output(value: impl Serialize) -> i32 {
    let ret = bincode::serialize(&value).unwrap();
    let len = ret.len() as u32;
    unsafe {
        ::std::ptr::write(1 as _, len);
    }
    ret.as_ptr() as _
}