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feat: ArrayBuffer 载荷状态位与 byteLength 原型访问器

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This commit is contained in:
彭俊皓
2026-09-22 19:00:51 +00:00
parent 183e99b4b7
commit b5b456346c
6 changed files with 358 additions and 93 deletions
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crates/oxide_builtins/src/data_view.rs
+17 -7
View File
@@ -5,7 +5,7 @@ use oxide_types::value::JsValue;
use num_bigint::BigInt;
use num_traits::ToPrimitive;
use crate::array_buffer::array_buffer_data_ptr;
use crate::array_buffer::array_buffer_payload;
use oxide_runtime_api::{NativeResult, VmHost};
@@ -121,8 +121,11 @@ fn checked_absolute_offset<H: VmHost>(
/// GetViewValue 后半：按已校验的视图与偏移读 N 字节（越界抛 RangeError）。
fn read_bytes_at<const N: usize, H: VmHost>(vm: &mut H, view: DataViewData, offset: usize) -> Result<[u8; N], JsValue> {
let abs = checked_absolute_offset(vm, view, offset, N)?;
let buffer_ptr = array_buffer_data_ptr(vm, view.buffer)?;
let buffer = unsafe { &*buffer_ptr };
let payload_ptr = array_buffer_payload(vm, view.buffer)?;
// SAFETY: payload_ptr 经 array_buffer_payload 校验为合法 ArrayBuffer 载荷。
let Some(buffer) = unsafe { &*payload_ptr }.data.as_deref() else {
return Err(crate::error::create_type_error(vm, "ArrayBuffer internal state invalid"));
};
if abs + N > buffer.len() {
return Err(crate::error::create_range_error(vm, "DataView offset out of bounds"));
}
@@ -136,8 +139,11 @@ fn write_bytes<const N: usize, H: VmHost>(
vm: &mut H, view: DataViewData, offset: usize, bytes: [u8; N],
) -> Result<(), JsValue> {
let abs = checked_absolute_offset(vm, view, offset, N)?;
let buffer_ptr = array_buffer_data_ptr(vm, view.buffer)?;
let buffer = unsafe { &mut *buffer_ptr };
let payload_ptr = array_buffer_payload(vm, view.buffer)?;
// SAFETY: payload_ptr 经 array_buffer_payload 校验为合法 ArrayBuffer 载荷。
let Some(buffer) = unsafe { &mut *payload_ptr }.data.as_deref_mut() else {
return Err(crate::error::create_type_error(vm, "ArrayBuffer internal state invalid"));
};
if abs + N > buffer.len() {
return Err(crate::error::create_range_error(vm, "DataView offset out of bounds"));
}
@@ -195,8 +201,12 @@ pub fn data_view_constructor<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult
return NativeResult::Err(crate::error::create_type_error(vm, "DataView requires an ArrayBuffer"));
}
let buffer = vm.reg(args[1]);
let buffer_ptr = native_try!(array_buffer_data_ptr(vm, buffer));
let buffer_len = unsafe { (*buffer_ptr).len() };
let payload_ptr = native_try!(array_buffer_payload(vm, buffer));
// SAFETY: payload_ptr 经 array_buffer_payload 校验为合法 ArrayBuffer 载荷。
let Some(data) = unsafe { &*payload_ptr }.data.as_ref() else {
return NativeResult::Err(crate::error::create_type_error(vm, "ArrayBuffer internal state invalid"));
};
let buffer_len = data.len();
let byte_offset = if args.len() > 2 {
native_try!(to_index(vm, vm.reg(args[2]), "DataView byteOffset out of bounds"))
} else {