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#![doc(html_root_url = "https://docs.rs/wasm_plugin_guest/0.1.0")]
#![deny(missing_docs)]
#[no_mangle]
static mut MESSAGE_BUFFER: [u8; 1024 * 10] = [0; 1024 * 10];
#[cfg(feature = "inject_getrandom")]
mod getrandom_shim {
use getrandom::register_custom_getrandom;
use getrandom::Error;
extern "C" {
fn __getrandom(ptr: i32, len: i32);
}
#[allow(clippy::unnecessary_wraps)]
fn external_getrandom(buf: &mut [u8]) -> Result<(), Error> {
let len = buf.len();
let ptr = buf.as_ptr();
unsafe {
__getrandom(ptr as i32, len as i32);
}
Ok(())
}
register_custom_getrandom!(external_getrandom);
}
pub fn read_message<T: serde::de::DeserializeOwned>() -> T {
let buf = unsafe { &mut MESSAGE_BUFFER };
bincode::deserialize(buf).unwrap()
}
pub fn write_message<U>(message: &U) -> i32
where
U: serde::Serialize,
{
let buf = unsafe { &mut MESSAGE_BUFFER };
let message: Vec<u8> = bincode::serialize(message).unwrap();
let len = message.len();
buf[0..len].copy_from_slice(&message);
len as i32
}
#[macro_export]
macro_rules! export_plugin_function_with_no_input {
($name:ident, $function:path) => {
const _: () = {
#[no_mangle]
pub extern "C" fn $name() -> i32 {
wasm_plugin_guest::write_message(&$function())
}
};
};
}
#[macro_export]
macro_rules! export_plugin_function_with_input_message {
($name:ident, $function:path) => {
const _: () = {
#[no_mangle]
pub extern "C" fn $name() -> i32 {
let message = wasm_plugin_guest::read_message();
wasm_plugin_guest::write_message(&$function(message))
}
};
};
}