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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use super::transl8::{FromV8, ToV8};
use crate::magic::transl8::{impl_magic, impl_wrapper};
use crate::Error;
impl_wrapper! { pub struct ByteString(Vec<u8>); }
impl_magic!(ByteString);
impl ToV8 for ByteString {
fn to_v8<'a>(
&self,
scope: &mut v8::HandleScope<'a>,
) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
let v =
v8::String::new_from_one_byte(scope, self, v8::NewStringType::Normal)
.unwrap();
Ok(v.into())
}
}
impl FromV8 for ByteString {
fn from_v8(
scope: &mut v8::HandleScope,
value: v8::Local<v8::Value>,
) -> Result<Self, crate::Error> {
let v8str = v8::Local::<v8::String>::try_from(value)
.map_err(|_| Error::ExpectedString)?;
if !v8str.contains_only_onebyte() {
return Err(Error::ExpectedLatin1);
}
let len = v8str.length();
let mut buffer = Vec::with_capacity(len);
// SAFETY: we set length == capacity (see previous line),
// before immediately writing into that buffer and sanity check with an assert
#[allow(clippy::uninit_vec)]
unsafe {
buffer.set_len(len);
let written = v8str.write_one_byte(
scope,
&mut buffer,
0,
v8::WriteOptions::NO_NULL_TERMINATION,
);
assert!(written == len);
}
Ok(buffer.into())
}
}
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