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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use std::ops::Deref;
use std::ops::DerefMut;
use std::sync::Mutex;
use super::transl8::FromV8;
use super::transl8::ToV8;
use super::zero_copy_buf::ZeroCopyBuf;
use crate::magic::transl8::impl_magic;
// An asymmetric wrapper around ZeroCopyBuf,
// allowing us to use a single type for familiarity
pub enum MagicBuffer {
FromV8(ZeroCopyBuf),
ToV8(Mutex<Option<Box<[u8]>>>),
// Variant of the MagicBuffer than is never exposed to the JS.
// Generally used to pass Vec<u8> backed buffers to resource methods.
Temp(Vec<u8>),
}
impl_magic!(MagicBuffer);
impl MagicBuffer {
pub fn empty() -> Self {
MagicBuffer::ToV8(Mutex::new(Some(vec![0_u8; 0].into_boxed_slice())))
}
pub fn new_temp(vec: Vec<u8>) -> Self {
MagicBuffer::Temp(vec)
}
// TODO(@littledivy): Temporary, this needs a refactor.
pub fn to_temp(self) -> Vec<u8> {
match self {
MagicBuffer::Temp(vec) => vec,
_ => unreachable!(),
}
}
}
impl Clone for MagicBuffer {
fn clone(&self) -> Self {
match self {
Self::FromV8(zbuf) => Self::FromV8(zbuf.clone()),
Self::Temp(vec) => Self::Temp(vec.clone()),
Self::ToV8(_) => panic!("Don't Clone a MagicBuffer sent to v8"),
}
}
}
impl AsRef<[u8]> for MagicBuffer {
fn as_ref(&self) -> &[u8] {
&*self
}
}
impl AsMut<[u8]> for MagicBuffer {
fn as_mut(&mut self) -> &mut [u8] {
&mut *self
}
}
impl Deref for MagicBuffer {
type Target = [u8];
fn deref(&self) -> &[u8] {
match self {
Self::FromV8(buf) => &*buf,
Self::Temp(vec) => &*vec,
Self::ToV8(_) => panic!("Don't Deref a MagicBuffer sent to v8"),
}
}
}
impl DerefMut for MagicBuffer {
fn deref_mut(&mut self) -> &mut [u8] {
match self {
Self::FromV8(buf) => &mut *buf,
Self::Temp(vec) => &mut *vec,
Self::ToV8(_) => panic!("Don't Deref a MagicBuffer sent to v8"),
}
}
}
impl From<Box<[u8]>> for MagicBuffer {
fn from(buf: Box<[u8]>) -> Self {
MagicBuffer::ToV8(Mutex::new(Some(buf)))
}
}
impl From<Vec<u8>> for MagicBuffer {
fn from(vec: Vec<u8>) -> Self {
vec.into_boxed_slice().into()
}
}
impl ToV8 for MagicBuffer {
fn to_v8<'a>(
&self,
scope: &mut v8::HandleScope<'a>,
) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
let buf: Box<[u8]> = match self {
Self::FromV8(buf) => {
let value: &[u8] = buf;
value.into()
}
Self::Temp(_) => unreachable!(),
Self::ToV8(x) => x.lock().unwrap().take().expect("MagicBuffer 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 = 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(),
)
}
}
impl FromV8 for MagicBuffer {
fn from_v8(
scope: &mut v8::HandleScope,
value: v8::Local<v8::Value>,
) -> Result<Self, crate::Error> {
Ok(Self::FromV8(ZeroCopyBuf::from_v8(scope, value)?))
}
}
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