Differential updates for components.

chrome/installer/setup/setup_util.cc

Index: chrome/installer/setup/setup_util.cc
===================================================================
--- chrome/installer/setup/setup_util.cc	(revision 201835)
+++ chrome/installer/setup/setup_util.cc	(working copy)
@@ -22,12 +22,19 @@
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/work_item.h"
 #include "courgette/courgette.h"
+#include "courgette/third_party/bsdiff.h"
 #include "third_party/bspatch/mbspatch.h"
 
 namespace installer {
 
 namespace {
 
+// The range of error values for the installer, Courgette, and bsdiff is
+// overlapping. These offset values disambiguate between different sets
+// of errors by shifting the values up with the specified offset.
+const int kCourgetteErrorOffset = 300;
+const int kBsdiffErrorOffset = 600;
+
 // Launches |setup_exe| with |command_line|, save --install-archive and its
 // value if present. Returns false if the process failed to launch. Otherwise,
 // waits indefinitely for it to exit and populates |exit_code| as expected. On
@@ -84,6 +91,51 @@
 
 }  // namespace
 
+int CourgettePatchFiles(const base::FilePath& src,
+                        const base::FilePath& patch,
+                        const base::FilePath& dest) {
+  VLOG(1) << "Applying Courgette patch " << patch.value() << " to file "
+          << src.value() << " and generating file " << dest.value();
+
+  if (src.empty() || patch.empty() || dest.empty()) {
+     return installer::PATCH_INVALID_ARGUMENTS;
+  }
+
+  const courgette::Status patch_status =
+      courgette::ApplyEnsemblePatch(src.value().c_str(),
+                                    patch.value().c_str(),
+                                    dest.value().c_str());
+  const int exit_code = (patch_status != courgette::C_OK) ?
+      static_cast<int>(patch_status) + kCourgetteErrorOffset  : 0;
+  if (exit_code) {
+     VLOG(1) << "Failed to apply patch " << patch.value()
+             << ". err=" << exit_code;
+  }
+
+  return exit_code;
+}
+
+int BsdiffPatchFiles(const base::FilePath& src,
+                     const base::FilePath& patch,
+                     const base::FilePath& dest) {
+  VLOG(1) << "Applying bsdiff patch " << patch.value() << " to file "
+          << src.value() << " and generating file " << dest.value();
+
+  if (src.empty() || patch.empty() || dest.empty()) {
+     return installer::PATCH_INVALID_ARGUMENTS;
+  }
+
+  const int patch_status = courgette::ApplyBinaryPatch(src, patch, dest);
+  const int exit_code = patch_status ?
+                        patch_status + kBsdiffErrorOffset : 0;
+  if (exit_code) {
+     VLOG(1) << "Failed to apply patch " << patch.value()
+             << ". err=" << exit_code;
+  }
+
+  return exit_code;
+}
+
 int ApplyDiffPatch(const base::FilePath& src,
                    const base::FilePath& patch,
                    const base::FilePath& dest,
@@ -117,8 +169,14 @@
   if (installer_state != NULL)
     installer_state->UpdateStage(installer::BINARY_PATCHING);
 
-  return ApplyBinaryPatch(src.value().c_str(), patch.value().c_str(),
-                          dest.value().c_str());
+  int binary_patch_status = ApplyBinaryPatch(src.value().c_str(),
+                                             patch.value().c_str(),
+                                             dest.value().c_str());
+
+  VLOG(1) << "Failed to apply patch " << patch.value()
+          << " using bsdiff. err=" << binary_patch_status;
+
+  return binary_patch_status;
 }
 
 Version* GetMaxVersionFromArchiveDir(const base::FilePath& chrome_path) {