Added member data to classes to support download resumption.

content/browser/download/download_item.h

 // Copyright (c) 2011 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.
 //
 // Each download is represented by a DownloadItem, and all DownloadItems
 // are owned by the DownloadManager which maintains a global list of all
 // downloads. DownloadItems are created when a user initiates a download,
 // and exist for the duration of the browser life time.
 //
 // Download observers:
@@ skipping 106 matching lines @@
   // Open the file associated with this download (wait for the download to
   // complete if it is in progress).
   virtual void OpenDownload() = 0;
 
   // Show the download via the OS shell.
   virtual void ShowDownloadInShell() = 0;
 
   // Called when the user has validated the download of a dangerous file.
   virtual void DangerousDownloadValidated() = 0;
 
-  // Received a new chunk of data
-  virtual void Update(int64 bytes_so_far) = 0;
+  // Received a new chunk of data.
+  // |bytes_so_far| is the number of bytes received so far.
+  // |hash_state| is the current hash state.
+  virtual void Update(int64 bytes_so_far, const std::string& hash_state) = 0;
 
   // Cancel the download operation. We need to distinguish between cancels at
   // exit (DownloadManager destructor) from user interface initiated cancels
   // because at exit, the history system may not exist, and any updates to it
   // require AddRef'ing the DownloadManager in the destructor which results in
   // a DCHECK failure. Set |user_cancel| to false when canceling from at
   // exit to prevent this crash. This may result in a difference between the
   // downloaded file's size on disk, and what the history system's last record
   // of it is. At worst, we'll end up re-downloading a small portion of the file
   // when resuming a download (assuming the server supports byte ranges).
   virtual void Cancel(bool user_cancel) = 0;
 
   // Called by external code (SavePackage) using the DownloadItem interface
   // to display progress when the DownloadItem should be considered complete.
   virtual void MarkAsComplete() = 0;
 
   // Called by the delegate after it delayed opening the download in
   // DownloadManagerDelegate::ShouldOpenDownload.
   virtual void DelayedDownloadOpened() = 0;
 
   // Called when all data has been saved. Only has display effects.
   virtual void OnAllDataSaved(int64 size, const std::string& final_hash) = 0;
 
   // Called when the downloaded file is removed.
   virtual void OnDownloadedFileRemoved() = 0;
 
   // Download operation had an error.
   // |size| is the amount of data received at interruption.
+  // |hash_state| is the current hash state at interruption.
   // |reason| is the download interrupt reason code that the operation received.
-  virtual void Interrupted(int64 size, InterruptReason reason) = 0;
+  virtual void Interrupted(int64 size,
+                           const std::string& hash_state,
+                           InterruptReason reason) = 0;
 
   // Deletes the file from disk and removes the download from the views and
   // history.  |user| should be true if this is the result of the user clicking
   // the discard button, and false if it is being deleted for other reasons like
   // browser shutdown.
   virtual void Delete(DeleteReason reason) = 0;
 
   // Removes the download from the views and history.
   virtual void Remove() = 0;
 
@@ skipping 64 matching lines @@
   virtual const GURL& GetOriginalUrl() const = 0;
   virtual const GURL& GetReferrerUrl() const = 0;
   virtual std::string GetSuggestedFilename() const = 0;
   virtual std::string GetContentDisposition() const = 0;
   virtual std::string GetMimeType() const = 0;
   virtual std::string GetOriginalMimeType() const = 0;
   virtual std::string GetReferrerCharset() const = 0;
   virtual int64 GetTotalBytes() const = 0;
   virtual void SetTotalBytes(int64 total_bytes) = 0;
   virtual int64 GetReceivedBytes() const = 0;
+  virtual const std::string& GetHashState() const = 0;
   virtual int32 GetId() const = 0;
   virtual DownloadId GetGlobalId() const = 0;
   virtual base::Time GetStartTime() const = 0;
   virtual base::Time GetEndTime() const = 0;
   virtual void SetDbHandle(int64 handle) = 0;
   virtual int64 GetDbHandle() const = 0;
   virtual DownloadManager* GetDownloadManager() = 0;
   virtual bool IsPaused() const = 0;
   virtual bool GetOpenWhenComplete() const = 0;
   virtual void SetOpenWhenComplete(bool open) = 0;
   virtual bool GetFileExternallyRemoved() const = 0;
   virtual SafetyState GetSafetyState() const = 0;
   // Why |safety_state_| is not SAFE.
   virtual DownloadStateInfo::DangerType GetDangerType() const = 0;
   virtual bool IsDangerous() const = 0;
   virtual void MarkContentDangerous() = 0;
   virtual void MarkFileDangerous() = 0;
   virtual void MarkUrlDangerous() = 0;
 
   virtual bool GetAutoOpened() = 0;
   virtual const FilePath& GetTargetName() const = 0;
   virtual bool PromptUserForSaveLocation() const = 0;
   virtual bool IsOtr() const = 0;
   virtual const FilePath& GetSuggestedPath() const = 0;
   virtual bool IsTemporary() const = 0;
   virtual void SetOpened(bool opened) = 0;
   virtual bool GetOpened() const = 0;
 
+  virtual const std::string& GetLastModifiedTime() const = 0;
+  virtual const std::string& GetETag() const = 0;
+
   virtual InterruptReason GetLastReason() const = 0;
   virtual DownloadPersistentStoreInfo GetPersistentStoreInfo() const = 0;
   virtual DownloadStateInfo GetStateInfo() const = 0;
   virtual TabContents* GetTabContents() const = 0;
 
   // Returns the final target file path for the download.
   virtual FilePath GetTargetFilePath() const = 0;
 
   // Returns the file-name that should be reported to the user, which is
   // target_name possibly with the uniquifier number.
@@ skipping 14 matching lines @@
   // DownloadManager::FileSelectionCancelled() without doing some
   // rewrites of the DownloadManager queues.
   virtual void OffThreadCancel(DownloadFileManager* file_manager) = 0;
 
   virtual std::string DebugString(bool verbose) const = 0;
 
   virtual void MockDownloadOpenForTesting() = 0;
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_H_