Added member data to classes to support download resumption.

content/browser/download/download_resource_handler.cc

 // 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.
 
 #include "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 35 matching lines @@
       global_id_(render_process_host_id, request_id),
       render_view_id_(render_view_id),
       content_length_(0),
       download_file_manager_(download_file_manager),
       request_(request),
       save_as_(save_as),
       started_cb_(started_cb),
       save_info_(save_info),
       buffer_(new content::DownloadBuffer),
       rdh_(rdh),
-      is_paused_(false) {
+      is_paused_(false),
+      start_offset_(0) {
   DCHECK(dl_id.IsValid());
   download_stats::RecordDownloadCount(download_stats::UNTHROTTLED_COUNT);
 }
 
 bool DownloadResourceHandler::OnUploadProgress(int request_id,
                                                uint64 position,
                                                uint64 size) {
   return true;
 }
 
@@ skipping 26 matching lines @@
     ResourceDispatcherHost::InfoForRequest(request_);
 
   // Deleted in DownloadManager.
   DownloadCreateInfo* info = new DownloadCreateInfo(FilePath(), GURL(),
       base::Time::Now(), 0, content_length_, DownloadItem::IN_PROGRESS,
       download_id_, request_info->has_user_gesture(),
       request_info->transition_type());
   info->url_chain = request_->url_chain();
   info->referrer_url = GURL(request_->referrer());
   info->start_time = base::Time::Now();
-  info->received_bytes = 0;
+  info->received_bytes = start_offset_;
   info->total_bytes = content_length_;
   info->state = DownloadItem::IN_PROGRESS;
   info->download_id = download_id_;
   info->has_user_gesture = request_info->has_user_gesture();
   info->content_disposition = content_disposition_;
   info->mime_type = response->response_head.mime_type;
   download_stats::RecordDownloadMimeType(info->mime_type);
 
   DownloadRequestHandle request_handle(rdh_, global_id_.child_id,
                                        render_view_id_, global_id_.request_id);
 
-  // TODO(ahendrickson) -- Get the last modified time and etag, so we can
-  // resume downloading.
+  // Get the last modified time and etag.
+  const net::HttpResponseHeaders* headers = request_->response_headers();
+  if (headers) {
+    std::string last_modified_hdr;
+    std::string etag;
+    if (headers->EnumerateHeader(NULL, "Last-Modified", &last_modified_hdr))
+      info->last_modified = last_modified_hdr;
+    if (headers->EnumerateHeader(NULL, "ETag", &etag))
+      info->etag = etag;
+  }
 
   CallStartedCB(net::OK);
 
   std::string content_type_header;
   if (!response->response_head.headers ||
       !response->response_head.headers->GetMimeType(&content_type_header))
     content_type_header = "";
   info->original_mime_type = content_type_header;
 
   info->prompt_user_for_save_location =
@@ skipping 181 matching lines @@
                             " render_view_id_ = " "%d"
                             " save_info_.file_path = \"%" PRFilePath "\""
                             " }",
                             request_->url().spec().c_str(),
                             download_id_.local(),
                             global_id_.child_id,
                             global_id_.request_id,
                             render_view_id_,
                             save_info_.file_path.value().c_str());
 }