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use crate::{api, prelude::*};
use std::{mem::MaybeUninit, os::raw::c_char};
#[derive(Copy, Clone, Debug)]
pub struct JsBuffer<const N: usize>(pub(crate) JsValue);
impl<const N: usize> JsBuffer<N> {
pub(crate) fn from_value(value: JsValue) -> JsBuffer<N> {
JsBuffer(value)
}
/// This API allocates a node::Buffer object. While this is still a fully-supported data
/// structure, in most cases using a TypedArray will suffice.
pub fn create(env: NapiEnv) -> NapiResult<JsBuffer<N>> {
let buffer = napi_call!(=napi_create_buffer, env, N, std::ptr::null_mut());
Ok(JsBuffer::<N>::from_raw(env, buffer))
}
/// This API allocates a node::Buffer object and initializes it with data copied from the
/// passed-in buffer. While this is still a fully-supported data structure, in most cases using
/// a TypedArray will suffice.
pub fn create_copy(env: NapiEnv, data: [u8; N]) -> NapiResult<JsBuffer<N>> {
let buffer = napi_call!(
=napi_create_buffer_copy,
env,
N,
data.as_ref().as_ptr() as _,
std::ptr::null_mut(),
);
Ok(JsBuffer::<N>::from_raw(env, buffer))
}
// pub fn create_external(
// env: NapiEnv,
// data: impl AsRef<[u8]>,
// finalizer: impl FnOnce(NapiEnv, [u8; N]) -> NapiResult<()> + 'static,
// ) -> NapiResult<JsBuffer<N>>
// {
// type FnOnceBoxed<const N: usize> = Box<dyn FnOnce(NapiEnv, [u8; N]) -> NapiResult<()>>;
//
// unsafe extern "C" fn finalize<const N: usize>(
// env: NapiEnv,
// data: DataPointer,
// hint: DataPointer,
// ) {
// let ext: [u8; N] = *(data as *const [u8; N]);
// let finalizer: Box<FnOnceBoxed::<N>> = Box::from_raw(hint as _);
// if let Err(e) = finalizer(env, ext) {
// log::error!("JsExternal::<T>::finalize: {}", e);
// }
// std::ptr::drop_in_place(data as *mut [u8; N]);
// }
//
// let finalizer: Box<FnOnceBoxed::<N>> = Box::new(Box::new(finalizer));
// let data = std::mem::ManuallyDrop::new([10; 10]);
//
// let buffer = napi_call!(
// =napi_create_external_buffer,
// env,
// N,
// data.as_ptr() as DataPointer,
// Some(finalize::<N>),
// Box::into_raw(finalizer) as DataPointer,
// );
//
// Ok(JsBuffer::from_raw(env, buffer))
// }
/// Get the underlaying array
pub fn get(&self) -> NapiResult<&[u8]> {
let mut data = MaybeUninit::uninit();
let length = napi_call!(=napi_get_buffer_info, self.env(), self.raw(), data.as_mut_ptr());
if length != N {
return Err(NapiStatus::InvalidArg);
}
unsafe {
let data = data.assume_init();
Ok(std::slice::from_raw_parts(data as *mut u8, N))
}
}
/// Get the underlaying array (mut)
pub fn get_mut(&mut self) -> NapiResult<&mut [u8]> {
let mut data = MaybeUninit::uninit();
let length = napi_call!(=napi_get_buffer_info, self.env(), self.raw(), data.as_mut_ptr());
if length != N {
return Err(NapiStatus::InvalidArg);
}
unsafe {
let data = data.assume_init();
Ok(std::slice::from_raw_parts_mut(data as *mut u8, N))
}
}
/// The length of current buffer.
pub const fn len(&self) -> usize {
N
}
/// The buffer is empty
pub const fn is_empty(&self) -> bool {
N == 0
}
}
impl<const N: usize> NapiValueT for JsBuffer<N> {
fn from_raw(env: NapiEnv, raw: napi_value) -> JsBuffer<N> {
JsBuffer(JsValue(env, raw))
}
fn value(&self) -> JsValue {
self.0
}
}
impl<const N: usize> std::ops::Index<usize> for JsBuffer<N> {
type Output = u8;
fn index(&self, idx: usize) -> &Self::Output {
&self.get().unwrap()[idx]
}
}
impl<const N: usize> NapiValueCheck for JsBuffer<N> {
fn check(&self) -> NapiResult<bool> {
Ok(napi_call!(=napi_is_buffer, self.env(), self.raw()))
}
}