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LibWeb: Partially implement the ReadableStream pull-from-bytes AO

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We do not handle BYOB request views yet, as they are not needed for the
upcoming usage of this AO.
This commit is contained in:
Timothy Flynn 2024-05-25 16:54:32 -04:00 • committed by Andreas Kling
parent 9cc186b929
commit 2a2c59e74b
Notes: sideshowbarker 2024-07-17 06:09:44 +09:00
2 changed files with 44 additions and 0 deletions
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43
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
View file

@ -3221,6 +3221,49 @@ WebIDL::ExceptionOr<void> readable_byte_stream_controller_enqueue(ReadableByteSt
return {};
}
// https://streams.spec.whatwg.org/#readablestream-pull-from-bytes
WebIDL::ExceptionOr<void> readable_stream_pull_from_bytes(ReadableStream& stream, ByteBuffer bytes)
{
// 1. Assert: stream.[[controller]] implements ReadableByteStreamController.
auto controller = stream.controller()->get<JS::NonnullGCPtr<ReadableByteStreamController>>();
// 2. Let available be bytes’s length.
auto available = bytes.size();
// 3. Let desiredSize be available.
auto desired_size = available;
// FIXME: 4. If stream’s current BYOB request view is non-null, then set desiredSize to stream’s current BYOB request
// view's byte length.
// 5. Let pullSize be the smaller value of available and desiredSize.
auto pull_size = min(available, desired_size);
// 6. Let pulled be the first pullSize bytes of bytes.
auto pulled = pull_size == available ? move(bytes) : MUST(bytes.slice(0, pull_size));
// 7. Remove the first pullSize bytes from bytes.
if (pull_size != available)
bytes = MUST(bytes.slice(pull_size, available - pull_size));
// FIXME: 8. If stream’s current BYOB request view is non-null, then:
// 1. Write pulled into stream’s current BYOB request view.
// 2. Perform ? ReadableByteStreamControllerRespond(stream.[[controller]], pullSize).
// 9. Otherwise,
{
auto& realm = HTML::relevant_realm(stream);
// 1. Set view to the result of creating a Uint8Array from pulled in stream’s relevant Realm.
auto array_buffer = JS::ArrayBuffer::create(realm, move(pulled));
auto view = JS::Uint8Array::create(realm, array_buffer->byte_length(), *array_buffer);
// 2. Perform ? ReadableByteStreamControllerEnqueue(stream.[[controller]], view).
TRY(readable_byte_stream_controller_enqueue(controller, view));
}
return {};
}
// https://streams.spec.whatwg.org/#transfer-array-buffer
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::ArrayBuffer>> transfer_array_buffer(JS::Realm& realm, JS::ArrayBuffer& buffer)
{

1
Userland/Libraries/LibWeb/Streams/AbstractOperations.h
View file

@ -94,6 +94,7 @@ WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_with_new_view(
WebIDL::ExceptionOr<void> readable_stream_enqueue(ReadableStreamController& controller, JS::Value chunk);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_enqueue(ReadableByteStreamController& controller, JS::Value chunk);
WebIDL::ExceptionOr<void> readable_stream_pull_from_bytes(ReadableStream&, ByteBuffer bytes);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::ArrayBuffer>> transfer_array_buffer(JS::Realm& realm, JS::ArrayBuffer& buffer);
WebIDL::ExceptionOr<void> readable_byte_stream_controller_enqueue_detached_pull_into_queue(ReadableByteStreamController& controller, PullIntoDescriptor& pull_into_descriptor);
void readable_byte_stream_controller_commit_pull_into_descriptor(ReadableStream&, PullIntoDescriptor const&);