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https://github.com/denoland/deno.git
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10e4b2e140
Yearly tradition of creating extra noise in git.
69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use core::ops::Range;
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use std::ops::Deref;
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use std::ops::DerefMut;
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use super::transl8::FromV8;
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use super::transl8::ToV8;
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use super::v8slice::to_ranged_buffer;
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use super::v8slice::V8Slice;
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use crate::magic::transl8::impl_magic;
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// A buffer that detaches when deserialized from JS
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pub struct DetachedBuffer(V8Slice);
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impl_magic!(DetachedBuffer);
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impl AsRef<[u8]> for DetachedBuffer {
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fn as_ref(&self) -> &[u8] {
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self.0.as_ref()
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}
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}
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impl AsMut<[u8]> for DetachedBuffer {
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fn as_mut(&mut self) -> &mut [u8] {
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self.0.as_mut()
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}
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}
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impl Deref for DetachedBuffer {
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type Target = [u8];
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fn deref(&self) -> &[u8] {
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self.0.deref()
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}
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}
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impl DerefMut for DetachedBuffer {
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fn deref_mut(&mut self) -> &mut [u8] {
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self.0.deref_mut()
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}
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}
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impl ToV8 for DetachedBuffer {
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fn to_v8<'a>(
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&mut self,
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scope: &mut v8::HandleScope<'a>,
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) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
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let buffer = v8::ArrayBuffer::with_backing_store(scope, &self.0.store);
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let Range { start, end } = self.0.range;
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let (off, len) = (start, end - start);
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let v = v8::Uint8Array::new(scope, buffer, off, len).unwrap();
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Ok(v.into())
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}
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}
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impl FromV8 for DetachedBuffer {
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fn from_v8(
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scope: &mut v8::HandleScope,
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value: v8::Local<v8::Value>,
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) -> Result<Self, crate::Error> {
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let (b, range) =
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to_ranged_buffer(scope, value).or(Err(crate::Error::ExpectedBuffer))?;
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if !b.is_detachable() {
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return Err(crate::Error::ExpectedDetachable);
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}
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let store = b.get_backing_store();
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b.detach(None); // Detach
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Ok(Self(V8Slice { store, range }))
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}
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}
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