Extend the IOBuffer to the disk cache.

net/base/io_buffer.h

 // Copyright (c) 2009 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_BASE_IO_BUFFER_H_
 #define NET_BASE_IO_BUFFER_H_
 
 #include "base/logging.h"
 #include "base/ref_counted.h"
 
 namespace net {
 
 // This is a simple wrapper around a buffer that provides ref counting for
 // easier asynchronous IO handling.
 class IOBuffer : public base::RefCountedThreadSafe<IOBuffer> {
  public:
   IOBuffer() : data_(NULL) {}
   explicit IOBuffer(int buffer_size) {
     DCHECK(buffer_size);
     data_ = new char[buffer_size];
   }
-  explicit IOBuffer(char* buffer) : data_(buffer) {}
+  explicit IOBuffer(char* data) : data_(data) {}
   virtual ~IOBuffer() {
     delete[] data_;
   }
 
   char* data() { return data_; }
 
  protected:
   char* data_;
 };
 
+// This class allows the creation of a temporary IOBuffer that doesn't really
+// owns the underlying buffer. Please use this class only as a last resort.

[darin (slow to review), 2009/02/10 04:40:27]

nit: s/owns/own/

maybe you could also more clearly state when it is OK to use this class.

+class WrappedIOBuffer : public net::IOBuffer {
+ public:
+  explicit WrappedIOBuffer(const char* data)
+      : net::IOBuffer(const_cast<char*>(data)) {}
+  ~WrappedIOBuffer() {
+    data_ = NULL;
+  }
+};
+
 }  // namespace net
 
 #endif  // NET_BASE_IO_BUFFER_H_