FTP Transaction code for new Portable FTP(Patch SET-3)

net/ftp/ftp_transaction.h

 // Copyright (c) 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_FTP_FTP_TRANSACTION_H_
 #define NET_FTP_FTP_TRANSACTION_H_
 
 #include "net/base/completion_callback.h"
+#include "net/base/io_buffer.h"
 #include "net/base/load_states.h"
 
+
 namespace net {
 
 class FtpRequestInfo;
 class FtpResponseInfo;
-
 // Represents a single FTP transaction.
 class FtpTransaction {
  public:
   // Stops any pending IO and destroys the transaction object.
-  virtual void Destroy() = 0;
+  virtual ~FtpTransaction() {}
 
   // Starts the FTP transaction (i.e., sends the FTP request).
   //
   // Returns OK if the transaction could be started synchronously, which means
   // that the request was served from the cache (only supported for directory
   // listings).  ERR_IO_PENDING is returned to indicate that the
   // CompletionCallback will be notified once response info is available or if
   // an IO error occurs.  Any other return value indicates that the transaction
   // could not be started.
   //
@@ skipping 16 matching lines @@
   // Response data is copied into the given buffer and the number of bytes
   // copied is returned.  ERR_IO_PENDING is returned if response data is not
   // yet available.  The CompletionCallback is notified when the data copy
   // completes, and it is passed the number of bytes that were successfully
   // copied.  Or, if a read error occurs, the CompletionCallback is notified of
   // the error.  Any other negative return value indicates that the transaction
   // could not be read.
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
   //
-  virtual int Read(char* buf, int buf_len, CompletionCallback* callback) = 0;
+  virtual int Read(IOBuffer* buf, int buf_len,
+      CompletionCallback* callback) = 0;
 
   // Returns the response info for this transaction or NULL if the response
   // info is not available.
   virtual const FtpResponseInfo* GetResponseInfo() const = 0;
 
   // Returns the load state for this transaction.
   virtual LoadState GetLoadState() const = 0;
 
   // Returns the upload progress in bytes.  If there is no upload data,
-  // zero will be returned.  This does not include the request headers.
+  // zero will be returned.
   virtual uint64 GetUploadProgress() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_FTP_FTP_TRANSACTION_H_