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LibWeb: Implement Blob::bytes()

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Implements https://w3c.github.io/FileAPI/#dom-blob-bytes.
This commit is contained in:
Kemal Zebari 2024-07-23 23:48:01 -07:00 • committed by Andreas Kling
parent 1ce9bbdd6d
commit c5f1e47883
Notes: github-actions[bot] 2024-07-26 08:22:29 +00:00
12 changed files with 52 additions and 10 deletions
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28
Userland/Libraries/LibWeb/FileAPI/Blob.cpp
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@ -107,7 +107,7 @@ ErrorOr<ByteBuffer> process_blob_parts(Vector<BlobPart> const& blob_parts, Optio
},
// 3. If element is a Blob, append the bytes it represents to bytes.
[&](JS::Handle<Blob> const& blob) -> ErrorOr<void> {
return bytes.try_append(blob->bytes());
return bytes.try_append(blob->raw_bytes());
}));
}
// 3. Return bytes.
@ -413,4 +413,30 @@ JS::NonnullGCPtr<JS::Promise> Blob::array_buffer()
}));
}
// https://w3c.github.io/FileAPI/#dom-blob-bytes
JS::NonnullGCPtr<JS::Promise> Blob::bytes()
{
auto& realm = this->realm();
// 1. Let stream be the result of calling get stream on this.
auto stream = get_stream();
// 2. Let reader be the result of getting a reader from stream. If that threw an exception, return a new promise rejected with that exception.
auto reader_or_exception = acquire_readable_stream_default_reader(*stream);
if (reader_or_exception.is_exception())
return WebIDL::create_rejected_promise_from_exception(realm, reader_or_exception.release_error());
auto reader = reader_or_exception.release_value();
// 3. Let promise be the result of reading all bytes from stream with reader.
auto promise = reader->read_all_bytes_deprecated();
// 4. Return the result of transforming promise by a fulfillment handler that returns a new Uint8Array wrapping an ArrayBuffer containing its first argument.
return WebIDL::upon_fulfillment(*promise, JS::create_heap_function(heap(), [&realm](JS::Value first_argument) -> WebIDL::ExceptionOr<JS::Value> {
auto& object = first_argument.as_object();
VERIFY(is<JS::ArrayBuffer>(object));
auto& array_buffer = static_cast<JS::ArrayBuffer&>(object);
return JS::Uint8Array::create(realm, array_buffer.byte_length(), array_buffer);
}));
}
}