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59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use crate::error::value_to_type_str;
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use crate::Error;
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use super::transl8::impl_magic;
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use super::transl8::impl_wrapper;
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use super::transl8::FromV8;
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use super::transl8::ToV8;
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impl_wrapper!(
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pub struct U16String(Vec<u16>);
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);
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impl_magic!(U16String);
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impl ToV8 for U16String {
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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 maybe_v =
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v8::String::new_from_two_byte(scope, self, v8::NewStringType::Normal);
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// 'new_from_two_byte' can return 'None' if buffer length > kMaxLength.
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if let Some(v) = maybe_v {
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Ok(v.into())
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} else {
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Err(Error::Message(String::from(
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"Cannot allocate String from UTF-16: buffer exceeds maximum length.",
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)))
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}
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}
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}
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impl FromV8 for U16String {
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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(value_to_type_str(value)))?;
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let len = v8str.length();
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let mut buffer = Vec::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(
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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(buffer.into())
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}
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}
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