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LibWeb: Implement the ReadableByteStreamControllerRespondWithNewView AO

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Timothy Flynn 2024-01-28 13:00:12 -05:00 committed by Andreas Kling
parent 5e5b42730c
commit ed1076d9ca
2 changed files with 56 additions and 0 deletions
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55
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
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@ -1581,6 +1581,61 @@ WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond(ReadableByteSt
return readable_byte_stream_controller_respond_internal(controller, bytes_written);
}
// https://streams.spec.whatwg.org/#readable-byte-stream-controller-respond-with-new-view
WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_with_new_view(JS::Realm& realm, ReadableByteStreamController& controller, WebIDL::ArrayBufferView& view)
{
// 1. Assert: controller.[[pendingPullIntos]] is not empty.
VERIFY(!controller.pending_pull_intos().is_empty());
// 2. Assert: ! IsDetachedBuffer(view.[[ViewedArrayBuffer]]) is false.
VERIFY(!view.viewed_array_buffer()->is_detached());
// 3. Let firstDescriptor be controller.[[pendingPullIntos]][0].
auto& first_descriptor = controller.pending_pull_intos().first();
// 4. Let state be controller.[[stream]].[[state]].
auto state = controller.stream()->state();
// 5. If state is "closed",
if (state == ReadableStream::State::Closed) {
// 1. If view.[[ByteLength]] is not 0, throw a TypeError exception.
if (view.byte_length() != 0)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Byte length is not zero for closed stream"sv };
}
// 6. Otherwise,
else {
// 1. Assert: state is "readable".
VERIFY(state == ReadableStream::State::Readable);
// 2. If view.[[ByteLength]] is 0, throw a TypeError exception.
if (view.byte_length() == 0)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Byte length is zero for stream which is not closed"sv };
}
// 7. If firstDescriptor’s byte offset + firstDescriptor’ bytes filled is not view.[[ByteOffset]], throw a RangeError exception.
if (first_descriptor.byte_offset + first_descriptor.bytes_filled != view.byte_offset())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Byte offset is not aligned with the pull request's byte offset"sv };
// 8. If firstDescriptor’s buffer byte length is not view.[[ViewedArrayBuffer]].[[ByteLength]], throw a RangeError exception.
if (first_descriptor.buffer_byte_length != view.viewed_array_buffer()->byte_length())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Buffer byte length is not aligned with the pull request's byte length"sv };
// 9. If firstDescriptor’s bytes filled + view.[[ByteLength]] > firstDescriptor’s byte length, throw a RangeError exception.
if (first_descriptor.bytes_filled + view.byte_length() > first_descriptor.byte_length)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Byte length is greater than the pull request's byte length"sv };
// 10. Let viewByteLength be view.[[ByteLength]].
auto view_byte_length = view.byte_length();
// 11. Set firstDescriptor’s buffer to ? TransferArrayBuffer(view.[[ViewedArrayBuffer]]).
first_descriptor.buffer = TRY(transfer_array_buffer(realm, *view.viewed_array_buffer()));
// 12. Perform ? ReadableByteStreamControllerRespondInternal(controller, viewByteLength).
TRY(readable_byte_stream_controller_respond_internal(controller, view_byte_length));
return {};
}
// https://streams.spec.whatwg.org/#readable-stream-default-controller-error
void readable_stream_default_controller_error(ReadableStreamDefaultController& controller, JS::Value error)
{

1
Userland/Libraries/LibWeb/Streams/AbstractOperations.h
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@ -87,6 +87,7 @@ WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_in_readable_st
void readable_byte_stream_controller_respond_in_closed_state(ReadableByteStreamController&, PullIntoDescriptor&);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_internal(ReadableByteStreamController&, u64 bytes_written);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond(ReadableByteStreamController&, u64 bytes_written);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_with_new_view(JS::Realm&, ReadableByteStreamController&, WebIDL::ArrayBufferView&);
WebIDL::ExceptionOr<void> readable_stream_enqueue(ReadableStreamController& controller, JS::Value chunk);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_enqueue(ReadableByteStreamController& controller, JS::Value chunk);