Wrap large IndexedDB values into Blobs before writing to LevelDB.

third_party/WebKit/Source/modules/indexeddb/IDBValue.h

 // 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 IDBValue_h
 #define IDBValue_h
 
 #include <memory>
 #include "modules/ModulesExport.h"
 #include "modules/indexeddb/IDBKey.h"
 #include "modules/indexeddb/IDBKeyPath.h"
 #include "platform/SharedBuffer.h"
+#include "platform/wtf/PassRefPtr.h"
 #include "platform/wtf/RefPtr.h"
 #include "public/platform/WebVector.h"
 
 namespace blink {
 
 class BlobDataHandle;
 class SerializedScriptValue;
 class WebBlobInfo;
 struct WebIDBValue;
 
 class MODULES_EXPORT IDBValue final : public RefCounted<IDBValue> {
  public:
   static PassRefPtr<IDBValue> Create();
   static PassRefPtr<IDBValue> Create(const WebIDBValue&, v8::Isolate*);
   static PassRefPtr<IDBValue> Create(const IDBValue*,
                                      IDBKey*,
                                      const IDBKeyPath&);
   ~IDBValue();
 
   bool IsNull() const;
   Vector<String> GetUUIDs() const;
   RefPtr<SerializedScriptValue> CreateSerializedValue() const;
   Vector<WebBlobInfo>* BlobInfo() const { return blob_info_.get(); }
   const IDBKey* PrimaryKey() const { return primary_key_; }
   const IDBKeyPath& KeyPath() const { return key_path_; }
 
  private:
+  friend class IDBValueUnwrapper;
+
   IDBValue();
   IDBValue(const WebIDBValue&, v8::Isolate*);
   IDBValue(PassRefPtr<SharedBuffer>,
            const WebVector<WebBlobInfo>&,
            IDBKey*,
            const IDBKeyPath&);
   IDBValue(const IDBValue*, IDBKey*, const IDBKeyPath&);
 
+  // Used by IDBValueUnwrapper.
+  IDBValue(PassRefPtr<SharedBuffer> unwrapped_data,
+           std::unique_ptr<Vector<RefPtr<BlobDataHandle>>>,
+           std::unique_ptr<Vector<WebBlobInfo>>);
+
   // Keep this private to prevent new refs because we manually bookkeep the
   // memory to V8.
   const RefPtr<SharedBuffer> data_;
   const std::unique_ptr<Vector<RefPtr<BlobDataHandle>>> blob_data_;
   const std::unique_ptr<Vector<WebBlobInfo>> blob_info_;
   const Persistent<IDBKey> primary_key_;
   const IDBKeyPath key_path_;
   int64_t external_allocated_size_ = 0;
   // Used to register memory externally allocated by the WebIDBValue, and to
   // unregister that memory in the destructor. Unused in other construction
   // paths.
   v8::Isolate* isolate_ = nullptr;
 };
 
 }  // namespace blink
 
 #endif