IO Extensions

FFI

Crate features: [ffi, io_extensions].
https://crates.io/crates/deno_ffi

Populates the Deno.dlopen, Deno.UnsafeCallback, Deno.UnsafePointer, Deno.UnsafePointerView, Deno.UnsafeFnPointer globals.
Not sandbox safe. Off by default

Permissions

This extension is affected by the following methods in the permissions trait:

• check_exec - Check if FFI execution is allowed
• check_read - Of FFI exec is allowed, check if a specific file is allowed to be read

Usage Example

const buffer = new ArrayBuffer(1024);
const baseAddress = Deno.UnsafePointer.value(Deno.UnsafePointer.of(buffer));

const throwCb = () => throw new Error("Error");
const cb = new Deno.UnsafeCallback({
    parameters: [],
    result: "void",
}, throwCb);

const fnPointer = new Deno.UnsafeFnPointer(cb.pointer, {
    parameters: [],
    result: "void",
});

assertThrows(() => fnPointer.call());
cb.close();