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 233 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(

[benjhayden, 2012/10/15 17:59:37]

Could this move to download_utils?

+    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 = browser::FindLastActiveWithProfile(profile_);
@@ skipping 640 matching lines @@
     int32 download_id, int64 db_handle) {
   // It's not immediately obvious, but HistoryBackend::CreateDownload() can
   // call this function with an invalid |db_handle|. For instance, this can
   // happen when the history database is offline. We cannot have multiple
   // DownloadItems with the same invalid db_handle, so we need to assign a
   // unique |db_handle| here.
   if (db_handle == DownloadItem::kUninitializedHandle)
     db_handle = download_history_->GetNextFakeDbHandle();
   download_manager_->OnItemAddedToPersistentStore(download_id, db_handle);
 }