| // Copyright 2015 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 FlexibleArrayBufferView_h |
| #define FlexibleArrayBufferView_h |
| |
| #include "core/CoreExport.h" |
| #include "core/dom/DOMArrayBufferView.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/Noncopyable.h" |
| |
| namespace blink { |
| |
| class CORE_EXPORT FlexibleArrayBufferView { |
| STACK_ALLOCATED(); |
| WTF_MAKE_NONCOPYABLE(FlexibleArrayBufferView); |
| |
| public: |
| FlexibleArrayBufferView() : m_smallData(nullptr), m_smallLength(0) {} |
| |
| void setFull(DOMArrayBufferView* full) { m_full = full; } |
| void setSmall(void* data, size_t length) { |
| m_smallData = data; |
| m_smallLength = length; |
| } |
| |
| void clear() { |
| m_full = nullptr; |
| m_smallData = nullptr; |
| m_smallLength = 0; |
| } |
| |
| bool isEmpty() const { return !m_full && !m_smallData; } |
| bool isFull() const { return m_full; } |
| |
| DOMArrayBufferView* full() const { |
| DCHECK(isFull()); |
| return m_full; |
| } |
| |
| // WARNING: The pointer returned by baseAddressMaybeOnStack() may point to |
| // temporary storage that is only valid during the life-time of the |
| // FlexibleArrayBufferView object. |
| void* baseAddressMaybeOnStack() const { |
| DCHECK(!isEmpty()); |
| return isFull() ? m_full->baseAddress() : m_smallData; |
| } |
| |
| unsigned byteOffset() const { |
| DCHECK(!isEmpty()); |
| return isFull() ? m_full->byteOffset() : 0; |
| } |
| |
| unsigned byteLength() const { |
| DCHECK(!isEmpty()); |
| return isFull() ? m_full->byteLength() : m_smallLength; |
| } |
| |
| operator bool() const { return !isEmpty(); } |
| |
| private: |
| Member<DOMArrayBufferView> m_full; |
| |
| void* m_smallData; |
| size_t m_smallLength; |
| }; |
| |
| } // namespace blink |
| |
| #endif // FlexibleArrayBufferView_h |