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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use core::ops::Range;use std::ops::Deref;use std::ops::DerefMut;
use super::transl8::FromV8;use super::transl8::ToV8;use super::v8slice::to_ranged_buffer;use super::v8slice::V8Slice;use crate::magic::transl8::impl_magic;
// A buffer that detaches when deserialized from JSpub struct DetachedBuffer(V8Slice);impl_magic!(DetachedBuffer);
impl AsRef<[u8]> for DetachedBuffer {  fn as_ref(&self) -> &[u8] {    self.0.as_ref()  }}
impl AsMut<[u8]> for DetachedBuffer {  fn as_mut(&mut self) -> &mut [u8] {    self.0.as_mut()  }}
impl Deref for DetachedBuffer {  type Target = [u8];  fn deref(&self) -> &[u8] {    self.0.deref()  }}
impl DerefMut for DetachedBuffer {  fn deref_mut(&mut self) -> &mut [u8] {    self.0.deref_mut()  }}
impl ToV8 for DetachedBuffer {  fn to_v8<'a>(    &mut self,    scope: &mut v8::HandleScope<'a>,  ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {    let buffer = v8::ArrayBuffer::with_backing_store(scope, &self.0.store);    let Range { start, end } = self.0.range;    let (off, len) = (start, end - start);    let v = v8::Uint8Array::new(scope, buffer, off, len).unwrap();    Ok(v.into())  }}
impl FromV8 for DetachedBuffer {  fn from_v8(    scope: &mut v8::HandleScope,    value: v8::Local<v8::Value>,  ) -> Result<Self, crate::Error> {    let (b, range) =      to_ranged_buffer(scope, value).or(Err(crate::Error::ExpectedBuffer))?;    if !b.is_detachable() {      return Err(crate::Error::ExpectedDetachable);    }    let store = b.get_backing_store();    b.detach(v8::undefined(scope).into()); // Detach    Ok(Self(V8Slice { store, range }))  }}