Differential updates for components.

chrome/browser/component_updater/component_updater_configurator.cc

Index: chrome/browser/component_updater/component_updater_configurator.cc
diff --git a/chrome/browser/component_updater/component_updater_configurator.cc b/chrome/browser/component_updater/component_updater_configurator.cc
index 16fa3e9619752730b02326dba994faf4c14aef10..43e90725a1a59ad428f20f9156162e07581c1fb8 100644
--- a/chrome/browser/component_updater/component_updater_configurator.cc
+++ b/chrome/browser/component_updater/component_updater_configurator.cc
@@ -14,31 +14,39 @@
 #include "base/strings/string_util.h"
 #include "base/win/windows_version.h"
 #include "build/build_config.h"
+#include "chrome/browser/component_updater/component_patcher.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/omaha_query_params/omaha_query_params.h"
 #include "net/url_request/url_request_context_getter.h"
 
+#if defined(OS_WIN)
+#include "chrome/browser/component_updater/component_patcher_win.h"
+#endif
+
 namespace {
+
 // Default time constants.
 const int kDelayOneMinute = 60;
 const int kDelayOneHour = kDelayOneMinute * 60;
 
 // Debug values you can pass to --component-updater-debug=value1,value2.
 // Speed up component checking.
-const char kDebugFastUpdate[] = "fast-update";
+const char kSwitchFastUpdate[] = "fast-update";
 // Force out-of-process-xml parsing.
-const char kDebugOutOfProcess[] = "out-of-process";
+const char kSwitchOutOfProcess[] = "out-of-process";
 // Add "testrequest=1" parameter to the update check query.
-const char kDebugRequestParam[] = "test-request";
+const char kSwitchRequestParam[] = "test-request";
+// Disables differential updates.
+const char kSwitchDisableDeltaUpdates[] = "disable-delta-updates";
 
 // The urls from which an update manifest can be fetched.
 const char* kUrlSources[] = {
   "http://clients2.google.com/service/update2/crx",       // BANDAID
   "http://omaha.google.com/service/update2/crx",          // CWS_PUBLIC
-  "http://omaha.sandbox.google.com/service/update2/crx"   // CWS_SANDBOX
+  "http://omaha.sandbox.google.com/service/update2/crx",   // CWS_SANDBOX
 };
 
-bool HasDebugValue(const std::vector<std::string>& vec, const char* test) {
+bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   if (vec.empty())
     return 0;
   return (std::find(vec.begin(), vec.end(), test) != vec.end());
@@ -64,25 +72,36 @@ class ChromeConfigurator : public ComponentUpdateService::Configurator {
   virtual net::URLRequestContextGetter* RequestContext() OVERRIDE;
   virtual bool InProcess() OVERRIDE;
   virtual void OnEvent(Events event, int val) OVERRIDE;
+  virtual ComponentPatcher* CreateComponentPatcher() OVERRIDE;
+  virtual bool DeltasEnabled() const OVERRIDE;
 
  private:
   net::URLRequestContextGetter* url_request_getter_;
   std::string extra_info_;
   bool fast_update_;
   bool out_of_process_;
+  bool deltas_enabled_;
 };
 
 ChromeConfigurator::ChromeConfigurator(const CommandLine* cmdline,
     net::URLRequestContextGetter* url_request_getter)
       : url_request_getter_(url_request_getter),
         extra_info_(chrome::OmahaQueryParams::Get(
-            chrome::OmahaQueryParams::CHROME)) {
+            chrome::OmahaQueryParams::CHROME)),
+        fast_update_(false),
+        out_of_process_(false),
+        deltas_enabled_(false) {
   // Parse comma-delimited debug flags.
-  std::vector<std::string> debug_values;
-  Tokenize(cmdline->GetSwitchValueASCII(switches::kComponentUpdaterDebug),
-      ",", &debug_values);
-  fast_update_ = HasDebugValue(debug_values, kDebugFastUpdate);
-  out_of_process_ = HasDebugValue(debug_values, kDebugOutOfProcess);
+  std::vector<std::string> switch_values;
+  Tokenize(cmdline->GetSwitchValueASCII(switches::kComponentUpdater),
+      ",", &switch_values);
+  fast_update_ = HasSwitchValue(switch_values, kSwitchFastUpdate);
+  out_of_process_ = HasSwitchValue(switch_values, kSwitchOutOfProcess);
+#if defined(OS_WIN)
+  deltas_enabled_ = !HasSwitchValue(switch_values, kSwitchDisableDeltaUpdates);
+#else
+  deltas_enabled_ = false;
+#endif
 
   // Make the extra request params, they are necessary so omaha does
   // not deliver components that are going to be rejected at install time.
@@ -91,7 +110,7 @@ ChromeConfigurator::ChromeConfigurator(const CommandLine* cmdline,
       base::win::OSInfo::WOW64_ENABLED)
     extra_info_ += "&wow64=1";
 #endif
-  if (HasDebugValue(debug_values, kDebugRequestParam))
+  if (HasSwitchValue(switch_values, kSwitchRequestParam))
     extra_info_ += "&testrequest=1";
 }
 
@@ -161,6 +180,18 @@ void ChromeConfigurator::OnEvent(Events event, int val) {
   }
 }
 
+ComponentPatcher* ChromeConfigurator::CreateComponentPatcher() {
+#if defined(OS_WIN)
+  return new ComponentPatcherWin();
+#else
+  return new ComponentPatcherCrossPlatform();
+#endif
+}
+
+bool ChromeConfigurator::DeltasEnabled() const {
+  return deltas_enabled_;
+}
+
 ComponentUpdateService::Configurator* MakeChromeComponentUpdaterConfigurator(
     const CommandLine* cmdline, net::URLRequestContextGetter* context_getter) {
   return new ChromeConfigurator(cmdline, context_getter);