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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_BUFFER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_BUFFER_H_
#include "base/allocator/partition_allocator/oom.h"
#include "base/containers/span.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/typed_arrays/array_buffer/array_buffer_contents.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer_base.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class CORE_EXPORT DOMArrayBuffer final : public DOMArrayBufferBase {
DEFINE_WRAPPERTYPEINFO();
public:
static DOMArrayBuffer* Create(ArrayBufferContents contents) {
return MakeGarbageCollected<DOMArrayBuffer>(std::move(contents));
}
static DOMArrayBuffer* Create(size_t num_elements, size_t element_byte_size) {
ArrayBufferContents contents(num_elements, element_byte_size,
ArrayBufferContents::kNotShared,
ArrayBufferContents::kZeroInitialize);
if (UNLIKELY(!contents.Data())) {
OOM_CRASH(num_elements * element_byte_size);
}
return Create(std::move(contents));
}
static DOMArrayBuffer* Create(const void* source, size_t byte_length) {
ArrayBufferContents contents(byte_length, 1,
ArrayBufferContents::kNotShared,
ArrayBufferContents::kDontInitialize);
if (UNLIKELY(!contents.Data())) {
OOM_CRASH(byte_length);
}
memcpy(contents.Data(), source, byte_length);
return Create(std::move(contents));
}
static DOMArrayBuffer* Create(scoped_refptr<SharedBuffer>);
static DOMArrayBuffer* Create(const Vector<base::span<const char>>&);
static DOMArrayBuffer* CreateOrNull(size_t num_elements,
size_t element_byte_size);
// Only for use by XMLHttpRequest::responseArrayBuffer,
// Internals::serializeObject, and
// FetchDataLoaderAsArrayBuffer::OnStateChange.
static DOMArrayBuffer* CreateUninitializedOrNull(size_t num_elements,
size_t element_byte_size);
explicit DOMArrayBuffer(ArrayBufferContents contents)
: DOMArrayBufferBase(std::move(contents)) {}
DOMArrayBuffer* Slice(size_t begin, size_t end) const;
bool IsDetachable(v8::Isolate*);
// Transfer the ArrayBuffer if it is detachable, otherwise make a copy and
// transfer that.
bool Transfer(v8::Isolate*, ArrayBufferContents& result);
// Share the ArrayBuffer, even if it is non-shared. Such sharing is necessary
// for e.g. WebAudio which uses a separate thread for processing the
// ArrayBuffer while at the same time exposing a NonShared Float32Array.
bool ShareNonSharedForInternalUse(ArrayBufferContents& result) {
if (!Content()->BackingStore()) {
result.Detach();
return false;
}
Content()->ShareNonSharedForInternalUse(result);
return true;
}
v8::MaybeLocal<v8::Value> Wrap(ScriptState*) override;
private:
bool TransferDetachable(v8::Isolate*, ArrayBufferContents& result);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_BUFFER_H_
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