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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use std::fmt::Debug;
use std::ops::Deref;
use std::ops::DerefMut;
use super::transl8::FromV8;
use super::transl8::ToV8;
use super::v8slice::V8Slice;
use crate::magic::transl8::impl_magic;
pub struct JsBuffer(V8Slice);
impl_magic!(JsBuffer);
impl Debug for JsBuffer {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_list().entries(self.0.as_ref().iter()).finish()
}
}
impl Clone for JsBuffer {
fn clone(&self) -> Self {
Self(self.0.clone())
}
}
impl AsRef<[u8]> for JsBuffer {
fn as_ref(&self) -> &[u8] {
&self.0
}
}
impl AsMut<[u8]> for JsBuffer {
fn as_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
impl Deref for JsBuffer {
type Target = [u8];
fn deref(&self) -> &[u8] {
&self.0
}
}
impl DerefMut for JsBuffer {
fn deref_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
impl FromV8 for JsBuffer {
fn from_v8(
scope: &mut v8::HandleScope,
value: v8::Local<v8::Value>,
) -> Result<Self, crate::Error> {
Ok(Self(V8Slice::from_v8(scope, value)?))
}
}
impl From<JsBuffer> for bytes::Bytes {
fn from(zbuf: JsBuffer) -> bytes::Bytes {
zbuf.0.into()
}
}
// NOTE(bartlomieju): we use Option here, because `to_v8()` uses `&mut self`
// instead of `self` which is dictated by the `serde` API.
#[derive(Debug)]
pub struct ToJsBuffer(Option<Box<[u8]>>);
impl_magic!(ToJsBuffer);
impl ToJsBuffer {
pub fn empty() -> Self {
ToJsBuffer(Some(vec![0_u8; 0].into_boxed_slice()))
}
}
impl From<Box<[u8]>> for ToJsBuffer {
fn from(buf: Box<[u8]>) -> Self {
ToJsBuffer(Some(buf))
}
}
impl From<Vec<u8>> for ToJsBuffer {
fn from(vec: Vec<u8>) -> Self {
vec.into_boxed_slice().into()
}
}
impl ToV8 for ToJsBuffer {
fn to_v8<'a>(
&mut self,
scope: &mut v8::HandleScope<'a>,
) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
let buf: Box<[u8]> = self.0.take().expect("RustToV8Buf was empty");
if buf.is_empty() {
let ab = v8::ArrayBuffer::new(scope, 0);
return Ok(
v8::Uint8Array::new(scope, ab, 0, 0)
.expect("Failed to create Uint8Array")
.into(),
);
}
let buf_len: usize = buf.len();
let backing_store =
v8::ArrayBuffer::new_backing_store_from_boxed_slice(buf);
let backing_store_shared = backing_store.make_shared();
let ab = v8::ArrayBuffer::with_backing_store(scope, &backing_store_shared);
Ok(
v8::Uint8Array::new(scope, ab, 0, buf_len)
.expect("Failed to create Uint8Array")
.into(),
)
}
}
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