LibWeb: Implement read a chunk concept for ReadableStreamDefaultReader

Author: https://github.com/kennethmyhra
Commit: https://github.com/SerenityOS/serenity/commit/34ecc59508
Pull-request: https://github.com/SerenityOS/serenity/pull/24132
Reviewed-by: https://github.com/shannonbooth
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.cpp

@@ -15,6 +15,7 @@
 #include <LibWeb/Bindings/ExceptionOrUtils.h>
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/Bindings/ReadableStreamDefaultReaderPrototype.h>
+#include <LibWeb/Fetch/Infrastructure/IncrementalReadLoopReadRequest.h>
 #include <LibWeb/Streams/AbstractOperations.h>
 #include <LibWeb/Streams/ReadableStream.h>
 #include <LibWeb/Streams/ReadableStreamDefaultReader.h>
@@ -187,6 +188,13 @@ JS::NonnullGCPtr<JS::Promise> ReadableStreamDefaultReader::read()
     return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise()) };
 }
 
+void ReadableStreamDefaultReader::read_a_chunk(Fetch::Infrastructure::IncrementalReadLoopReadRequest& read_request)
+{
+    // To read a chunk from a ReadableStreamDefaultReader reader, given a read request readRequest,
+    // perform ! ReadableStreamDefaultReaderRead(reader, readRequest).
+    readable_stream_default_reader_read(*this, read_request);
+}
+
 // https://streams.spec.whatwg.org/#readablestreamdefaultreader-read-all-bytes
 void ReadableStreamDefaultReader::read_all_bytes(ReadLoopReadRequest::SuccessSteps success_steps, ReadLoopReadRequest::FailureSteps failure_steps)
 {

Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.h

@@ -79,6 +79,7 @@ public:
 
     JS::NonnullGCPtr<JS::Promise> read();
 
+    void read_a_chunk(Fetch::Infrastructure::IncrementalReadLoopReadRequest& read_request);
     void read_all_bytes(ReadLoopReadRequest::SuccessSteps, ReadLoopReadRequest::FailureSteps);
     void read_all_chunks(ReadLoopReadRequest::ChunkSteps, ReadLoopReadRequest::SuccessSteps, ReadLoopReadRequest::FailureSteps);
     JS::NonnullGCPtr<WebIDL::Promise> read_all_bytes_deprecated();