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d5634164cb
Closes https://github.com/denoland/deno/issues/2699 Closes https://github.com/denoland/deno/issues/2347 Uses unstable rustfmt features. Since dprint invokes `rustfmt` we do not need to switch the cargo toolchain to nightly. Do we care about formatting stability of our codebase across Rust versions? (I don't)
108 lines
2.6 KiB
Rust
108 lines
2.6 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use super::transl8::FromV8;
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use super::transl8::ToV8;
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use crate::magic::transl8::impl_magic;
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use crate::Error;
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use smallvec::SmallVec;
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use std::mem::size_of;
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const USIZE2X: usize = size_of::<usize>() * 2;
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#[derive(
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PartialEq,
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Eq,
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Clone,
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Debug,
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Default,
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derive_more::Deref,
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derive_more::DerefMut,
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derive_more::AsRef,
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derive_more::AsMut,
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)]
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#[as_mut(forward)]
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#[as_ref(forward)]
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pub struct ByteString(SmallVec<[u8; USIZE2X]>);
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impl_magic!(ByteString);
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// const-assert that Vec<u8> and SmallVec<[u8; size_of::<usize>() * 2]> have a same size.
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// Note from https://docs.rs/smallvec/latest/smallvec/#union -
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// smallvec can still be larger than Vec if the inline buffer is
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// larger than two machine words.
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const _: () =
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assert!(size_of::<Vec<u8>>() == size_of::<SmallVec<[u8; USIZE2X]>>());
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impl ToV8 for ByteString {
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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 v =
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v8::String::new_from_one_byte(scope, self, v8::NewStringType::Normal)
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.unwrap();
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Ok(v.into())
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}
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}
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impl FromV8 for ByteString {
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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 v8str = v8::Local::<v8::String>::try_from(value)
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.map_err(|_| Error::ExpectedString)?;
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if !v8str.contains_only_onebyte() {
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return Err(Error::ExpectedLatin1);
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}
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let len = v8str.length();
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let mut buffer = SmallVec::with_capacity(len);
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#[allow(clippy::uninit_vec)]
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// SAFETY: we set length == capacity (see previous line),
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// before immediately writing into that buffer and sanity check with an assert
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unsafe {
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buffer.set_len(len);
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let written = v8str.write_one_byte(
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scope,
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&mut buffer,
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0,
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v8::WriteOptions::NO_NULL_TERMINATION,
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);
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assert!(written == len);
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}
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Ok(Self(buffer))
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}
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}
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// smallvec does not impl From/Into traits
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// like Vec<u8> does. So here we are.
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impl From<Vec<u8>> for ByteString {
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fn from(vec: Vec<u8>) -> Self {
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ByteString(SmallVec::from_vec(vec))
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}
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}
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#[allow(clippy::from_over_into)]
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impl Into<Vec<u8>> for ByteString {
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fn into(self) -> Vec<u8> {
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self.0.into_vec()
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}
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}
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impl From<&[u8]> for ByteString {
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fn from(s: &[u8]) -> Self {
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ByteString(SmallVec::from_slice(s))
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}
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}
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impl From<&str> for ByteString {
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fn from(s: &str) -> Self {
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let v: Vec<u8> = s.into();
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ByteString::from(v)
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}
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}
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impl From<String> for ByteString {
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fn from(s: String) -> Self {
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ByteString::from(s.into_bytes())
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}
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}
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