Disk cache v3 ref2

net/disk_cache/storage_block.h

 // Copyright (c) 2012 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.
 
 // See net/disk_cache/disk_cache.h for the public interface.
 
 #ifndef NET_DISK_CACHE_STORAGE_BLOCK_H_
 #define NET_DISK_CACHE_STORAGE_BLOCK_H_
 
 #include "net/disk_cache/addr.h"
@@ skipping 12 matching lines @@
 //    StorageBlock<TypeB> b(file, address);
 //    a.Load();
 //    DoSomething(a.Data());
 //    b.SetData(a.Data());
 //    ModifySomething(b.Data());
 //    // Data modified on the previous call will be saved by b's destructor.
 //    b.set_modified();
 template<typename T>
 class StorageBlock : public FileBlock {
  public:
+  StorageBlock();
   StorageBlock(MappedFile* file, Addr address);
   virtual ~StorageBlock();
 
   // FileBlock interface.
   virtual void* buffer() const;
   virtual size_t size() const;
   virtual int offset() const;
 
   // Allows the overide of dummy values passed on the constructor.
   bool LazyInit(MappedFile* file, Addr address);
@@ skipping 10 matching lines @@
 
   // Sets the object to lazily save the in-memory data on destruction.
   void set_modified();
 
   // Forgets that the data was modified, so it's not lazily saved.
   void clear_modified();
 
   // Gets a pointer to the internal storage (allocates storage if needed).
   T* Data();
 
+  // Returns the internal storage, if any.
+  T* ReleaseData();
+
   // Returns true if there is data associated with this object.
   bool HasData() const;
 
   // Returns true if the internal hash is correct.
   bool VerifyHash() const;
 
+  // Updates the internal hash value.
+  void UpdateHash();
+
   // Returns true if this object owns the data buffer, false if it is shared.
   bool own_data() const;
 
   const Addr address() const;
 
   // Loads and store the data.
   bool Load();
   bool Store();
   bool Load(FileIOCallback* callback, bool* completed);
   bool Store(FileIOCallback* callback, bool* completed);
 
  private:
   void AllocateData();
   void DeleteData();
   uint32 CalculateHash() const;
 
   T* data_;
   MappedFile* file_;
   Addr address_;
   bool modified_;
   bool own_data_;  // Is data_ owned by this object or shared with someone else.
   bool extended_;  // Used to store an entry of more than one block.
 
   DISALLOW_COPY_AND_ASSIGN(StorageBlock);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_STORAGE_BLOCK_H_