Detect file system errors during downloads.

content/browser/download/download_manager.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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 94 matching lines @@
   // Returns all non-temporary downloads matching |query|. Empty query matches
   // everything.
   void SearchDownloads(const string16& query, DownloadVector* result);
 
   // Returns true if initialized properly.
   bool Init(content::BrowserContext* browser_context);
 
   // Notifications sent from the download thread to the UI thread
   void StartDownload(int32 id);
   void UpdateDownload(int32 download_id, int64 size);
+
+  // |download_id| is the ID of the download.
+  // |size| is the number of bytes that have been downloaded.
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
-  void OnResponseCompleted(int32 download_id, int64 size, int os_error,
+  void OnResponseCompleted(int32 download_id, int64 size,
                            const std::string& hash);
 
   // Offthread target for cancelling a particular download.  Will be a no-op
   // if the download has already been cancelled.
   void CancelDownload(int32 download_id);
 
+  // Called when there is an error in the download.
+  // |download_id| is the ID of the download.
+  // |size| is the number of bytes that are currently downloaded.
+  // |error| is a download error code.  Indicates what caused the interruption.
+  void OnDownloadError(int32 download_id, int64 size, int error);
+
   // Called from DownloadItem to handle the DownloadManager portion of a
   // Cancel; should not be called from other locations.
   void DownloadCancelledInternal(DownloadItem* download);
 
   // Called from a view when a user clicks a UI button or link.
   void RemoveDownload(int64 download_handle);
 
   // Determine if the download is ready for completion, i.e. has had
   // all data saved, and completed the filename determination and
   // history insertion.
@@ skipping 149 matching lines @@
   // determined, either automatically based on the suggested file name, or by
   // the user in a Save As dialog box.
   void ContinueDownloadWithPath(DownloadItem* download,
                                 const FilePath& chosen_file);
 
   // All data has been downloaded.
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
   void OnAllDataSaved(int32 download_id, int64 size, const std::string& hash);
 
-  // An error occurred in the download.
-  void OnDownloadError(int32 download_id, int64 size, int os_error);
+  // Retrieves the download from the |download_id|.
+  // Returns NULL if the download is not active.
+  DownloadItem* GetActiveDownload(int32 download_id);
+
+  // Removes |download| from the active and in progress maps.
+  // Called when the download is cancelled or has an error.
+  // Does nothing if the download is not in the history DB.
+  void RemoveFromActiveList(DownloadItem* download);
 
   // Updates the delegate about the overall download progress.
   void UpdateDownloadProgress();
 
   // Inform observers that the model has changed.
   void NotifyModelChanged();
 
   // Debugging routine to confirm relationship between below
   // containers; no-op if NDEBUG.
   void AssertContainersConsistent() const;
@@ skipping 77 matching lines @@
   DownloadManagerDelegate* delegate_;
 
   // TODO(rdsmith): Remove when http://crbug.com/84508 is fixed.
   // For debugging only.
   int64 largest_db_handle_in_history_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_