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LibJS+LibWeb: Implement resizable ArrayBuffer support for DataView

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This is (part of) a normative change in the ECMA-262 spec. See:
a9ae96e
This commit is contained in:
Timothy Flynn 2023-10-15 09:46:09 -04:00 • committed by Andreas Kling
parent 29ac6e3689
commit c7fec9424c
12 changed files with 377 additions and 94 deletions
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10
Userland/Libraries/LibWeb/WebIDL/AbstractOperations.cpp
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@ -49,6 +49,12 @@ ErrorOr<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source)
} else if (is<JS::DataView>(buffer_source)) {
auto const& es_buffer_source = static_cast<JS::DataView const&>(buffer_source);
auto view_record = JS::make_data_view_with_buffer_witness_record(es_buffer_source, JS::ArrayBuffer::Order::SeqCst);
// AD-HOC: The WebIDL spec has not been updated for resizable ArrayBuffer objects. This check follows the behavior of step 7.
if (JS::is_view_out_of_bounds(view_record))
return ByteBuffer {};
// 1. Set esArrayBuffer to esBufferSource.[[ViewedArrayBuffer]].
es_array_buffer = es_buffer_source.viewed_array_buffer();
@ -56,13 +62,13 @@ ErrorOr<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source)
offset = es_buffer_source.byte_offset();
// 3. Set length to esBufferSource.[[ByteLength]].
length = es_buffer_source.byte_length();
length = JS::get_view_byte_length(view_record);
}
// 6. Otherwise:
else {
// 1. Assert: esBufferSource is an ArrayBuffer or SharedArrayBuffer object.
auto const& es_buffer_source = static_cast<JS::ArrayBuffer const&>(buffer_source);
es_array_buffer = &const_cast<JS ::ArrayBuffer&>(es_buffer_source);
es_array_buffer = &const_cast<JS::ArrayBuffer&>(es_buffer_source);
// 2. Set length to esBufferSource.[[ArrayBufferByteLength]].
length = es_buffer_source.byte_length();