Extend the IOBuffer to the disk cache....

net/disk_cache/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_ENTRY_IMPL_H__
 #define NET_DISK_CACHE_ENTRY_IMPL_H__
 
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/storage_block.h"
 #include "net/disk_cache/storage_block-inl.h"
 
 namespace disk_cache {
 
 class BackendImpl;
 
 // This class implements the Entry interface. An object of this
 // class represents a single entry on the cache.
 class EntryImpl : public Entry, public base::RefCounted<EntryImpl> {
   friend class base::RefCounted<EntryImpl>;
  public:
   EntryImpl(BackendImpl* backend, Addr address);
 
   // 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);
 
   inline CacheEntryBlock* entry() {
     return &entry_;
   }
 
   inline CacheRankingsBlock* rankings() {
     return &node_;
   }
@@ skipping 98 matching lines @@
   int unreported_size_[NUM_STREAMS];  // Bytes not reported yet to the backend.
   bool doomed_;               // True if this entry was removed from the cache.
 
   DISALLOW_EVIL_CONSTRUCTORS(EntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_ENTRY_IMPL_H__