Download resumption - Preliminary

chrome/browser/download/chrome_download_manager_delegate.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 238 matching lines @@
       l10n_util::GetStringUTF8(IDS_DOWNLOAD_UNCONFIRMED_PREFIX);
 #endif
   base::SStringPrintf(
       &file_name,
       unconfirmed_prefix.append(
           FILE_PATH_LITERAL(" %d.crdownload")).c_str(),
       base::RandInt(0, 1000000));
   return dir.Append(file_name);
 }
 
+int64 ChromeDownloadManagerDelegate::GetIntermediateFileLength(
+    const FilePath& path, bool temporary) {
+  // Get the intermediate file name.
+  FilePath crpath = path;
+
+  if (!temporary)
+    crpath = download_util::GetCrDownloadPath(path);
+
+  // Validate the start offset.
+  int64 end = 0;
+  if (file_util::GetFileSize(crpath, &end))
+    return end;
+
+  return 0;
+}
+
 WebContents* ChromeDownloadManagerDelegate::
     GetAlternativeWebContentsToNotifyForDownload() {
 #if defined(OS_ANDROID)
   // Android does not implement BrowserList or any other way to get an
   // alternate web contents.
   return NULL;
 #else
   // Start the download in the last active browser. This is not ideal but better
   // than fully hiding the download from the user.
   Browser* last_active = chrome::FindLastActiveWithProfile(profile_);
@@ skipping 589 matching lines @@
     // TODO(asanka): This logic is a hack. DownloadFilePicker should give us a
     //               directory to persist. Or perhaps, if the Drive path
     //               substitution logic is moved here, then we would have a
     //               persistable path after the DownloadFilePicker is done.
     if (disposition == DownloadItem::TARGET_DISPOSITION_PROMPT &&
         !download->IsTemporary())
       last_download_path_ = target_path.DirName();
   }
   callback.Run(target_path, disposition, danger_type, intermediate_path);
 }