fxjs/cfx_v8_array_buffer_allocator.h

// Copyright 2021 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#ifndef FXJS_CFX_V8_ARRAY_BUFFER_ALLOCATOR_H_
#define FXJS_CFX_V8_ARRAY_BUFFER_ALLOCATOR_H_

#include <stddef.h>

#include <memory>

#include "v8/include/v8-array-buffer.h"

class CFX_V8ArrayBufferAllocator final : public v8::ArrayBuffer::Allocator {
 public:
  static const size_t kMaxAllowedBytes = 0x10000000;

  // Deliberately leaked. This allocator is used outside of the library
  // initialization / destruction lifecycle, and the caller does not take
  // ownership of the object. Thus there is no existing way to delete this.
  static CFX_V8ArrayBufferAllocator* GetSharedInstance();

  CFX_V8ArrayBufferAllocator();
  CFX_V8ArrayBufferAllocator(const CFX_V8ArrayBufferAllocator&) = delete;
  CFX_V8ArrayBufferAllocator(CFX_V8ArrayBufferAllocator&&) = delete;
  ~CFX_V8ArrayBufferAllocator() override;

  void* Allocate(size_t length) override;
  void* AllocateUninitialized(size_t length) override;
  void Free(void* data, size_t length) override;

 private:
  std::unique_ptr<v8::ArrayBuffer::Allocator> wrapped_;
};

#endif  // FXJS_CFX_V8_ARRAY_BUFFER_ALLOCATOR_H_