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LibWeb: Implement AO ReadableByteStreamControllerRespondInReadableState
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@ -1107,6 +1107,58 @@ void readable_stream_default_controller_clear_algorithms(ReadableStreamDefaultCo
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// controller.set_strategy_size_algorithm({});
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}
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// https://streams.spec.whatwg.org/#readable-byte-stream-controller-respond-in-readable-state
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WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_in_readable_state(ReadableByteStreamController& controller, u64 bytes_written, PullIntoDescriptor& pull_into_descriptor)
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{
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// 1. Assert: pullIntoDescriptor’s bytes filled + bytesWritten ≤ pullIntoDescriptor’s byte length.
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VERIFY(pull_into_descriptor.bytes_filled + bytes_written <= pull_into_descriptor.byte_length);
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// 2. Perform ! ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor).
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readable_byte_stream_controller_fill_head_pull_into_descriptor(controller, bytes_written, pull_into_descriptor);
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// 3. If pullIntoDescriptor’s reader type is "none",
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if (pull_into_descriptor.reader_type == ReaderType::None) {
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// 1. Perform ? ReadableByteStreamControllerEnqueueDetachedPullIntoToQueue(controller, pullIntoDescriptor).
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TRY(readable_byte_stream_controller_enqueue_detached_pull_into_queue(controller, pull_into_descriptor));
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// 2. Perform ! ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller).
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readable_byte_stream_controller_process_pull_into_descriptors_using_queue(controller);
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// 3. Return.
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return {};
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}
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// 4. If pullIntoDescriptor’s bytes filled < pullIntoDescriptor’s minimum fill, return.
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// FIXME: Support minimum fill.
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if (pull_into_descriptor.bytes_filled < pull_into_descriptor.element_size)
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return {};
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// NOTE: A descriptor for a read() request that is not yet filled up to its minimum length will stay at the head of the queue, so the underlying source can keep filling it.
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// 5. Perform ! ReadableByteStreamControllerShiftPendingPullInto(controller).
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// NOTE: We need to take a copy of pull_into_descriptor here as the shift destroys the pull into descriptor we are given.
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auto pull_into_descriptor_copy = readable_byte_stream_controller_shift_pending_pull_into(controller);
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// 6. Let remainderSize be the remainder after dividing pullIntoDescriptor’s bytes filled by pullIntoDescriptor’s element size.
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auto remainder_size = pull_into_descriptor_copy.bytes_filled % pull_into_descriptor_copy.element_size;
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// 7. If remainderSize > 0,
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if (remainder_size > 0) {
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// 1. Let end be pullIntoDescriptor’s byte offset + pullIntoDescriptor’s bytes filled.
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auto end = pull_into_descriptor_copy.byte_offset + pull_into_descriptor_copy.bytes_filled;
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// 2. Perform ? ReadableByteStreamControllerEnqueueClonedChunkToQueue(controller, pullIntoDescriptor’s buffer, end − remainderSize, remainderSize).
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TRY(readable_byte_stream_controller_enqueue_cloned_chunk_to_queue(controller, *pull_into_descriptor_copy.buffer, end - remainder_size, remainder_size));
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}
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// 8. Set pullIntoDescriptor’s bytes filled to pullIntoDescriptor’s bytes filled − remainderSize.
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pull_into_descriptor_copy.bytes_filled -= remainder_size;
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// 9. Perform ! ReadableByteStreamControllerCommitPullIntoDescriptor(controller.[[stream]], pullIntoDescriptor).
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readable_byte_stream_controller_commit_pull_into_descriptor(*controller.stream(), pull_into_descriptor_copy);
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return {};
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}
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// https://streams.spec.whatwg.org/#readable-stream-default-controller-error
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void readable_stream_default_controller_error(ReadableStreamDefaultController& controller, JS::Value error)
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{
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