Extend the IOBuffer to the disk cache....

net/disk_cache/mem_entry_impl.h

 // Copyright (c) 2006-2008 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 NET_DISK_CACHE_MEM_ENTRY_IMPL_H__
 #define NET_DISK_CACHE_MEM_ENTRY_IMPL_H__
 
 #include "net/disk_cache/disk_cache.h"
 
 namespace disk_cache {
 
 class MemBackendImpl;
 
 // This class implements the Entry interface for the memory-only cache. An
 // object of this class represents a single entry on the cache.
 class MemEntryImpl : public Entry {
  public:
   explicit MemEntryImpl(MemBackendImpl* backend);
 
   // Entry interface.
   virtual void Doom();
   virtual void Close();
   virtual std::string GetKey() const;
   virtual base::Time GetLastUsed() const;
   virtual base::Time GetLastModified() const;
   virtual int32 GetDataSize(int index) const;
-  virtual int ReadData(int index, int offset, char* buf, int buf_len,
+  virtual int ReadData(int index, int offset, net::IOBuffer* buf, int buf_len,
                        net::CompletionCallback* completion_callback);
-  virtual int WriteData(int index, int offset, const char* buf, int buf_len,
+  virtual int WriteData(int index, int offset, net::IOBuffer* buf, int buf_len,
                         net::CompletionCallback* completion_callback,
                         bool truncate);
 
   // Performs the initialization of a EntryImpl that will be added to the
   // cache.
   bool CreateEntry(const std::string& key);
 
   // Permamently destroys this entry
   void InternalDoom();
 
@@ skipping 41 matching lines @@
   MemBackendImpl* backend_;    // Back pointer to the cache.
   bool doomed_;                // True if this entry was removed from the cache.
 
   DISALLOW_EVIL_CONSTRUCTORS(MemEntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_MEM_ENTRY_IMPL_H__