AU: Changes for deltas on traditional bios machines.

libcurl_http_fetcher.h

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 
 #include <map>
 #include <string>
 #include <curl/curl.h>
@@ skipping 51 matching lines @@
   // These two methods are for glib main loop callbacks. They are called
   // when either a file descriptor is ready for work or when a timer
   // has fired. The static versions are shims for libcurl which has a C API.
   bool FDCallback(GIOChannel *source, GIOCondition condition);
   static gboolean StaticFDCallback(GIOChannel *source,
                                    GIOCondition condition,
                                    gpointer data) {
     return reinterpret_cast<LibcurlHttpFetcher*>(data)->FDCallback(source,
                                                                    condition);
   }
-  bool TimeoutCallback();
+  gboolean TimeoutCallback();
   static gboolean StaticTimeoutCallback(gpointer data) {
     return reinterpret_cast<LibcurlHttpFetcher*>(data)->TimeoutCallback();
   }
 
   // Calls into curl_multi_perform to let libcurl do its work. Returns after
   // curl_multi_perform is finished, which may actually be after more than
   // one call to curl_multi_perform. This method will set up the glib run
   // loop with sources for future work that libcurl will do.
   // This method will not block.
-  void CurlPerformOnce();
+  // Returns true if we should resume immediately after this call.
+  bool CurlPerformOnce();
 
   // Sets up glib main loop sources as needed by libcurl. This is generally
   // the file descriptor of the socket and a timer in case nothing happens
   // on the fds.
   void SetupMainloopSources();
 
   // Callback called by libcurl when new data has arrived on the transfer
   size_t LibcurlWrite(void *ptr, size_t size, size_t nmemb);
   static size_t StaticLibcurlWrite(void *ptr, size_t size,
                                    size_t nmemb, void *stream) {
@@ skipping 30 matching lines @@
   // new connection.  0 otherwise.
   off_t resume_offset_;
 
   long idle_ms_;
   DISALLOW_COPY_AND_ASSIGN(LibcurlHttpFetcher);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__