win: Add UUID::InitializeFromSystemUUID()

client/crash_report_database_win.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 566 matching lines @@
   return nullptr;
 }
 
 OperationStatus CrashReportDatabaseWin::PrepareNewCrashReport(
     NewReport** report) {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
 
   ::UUID system_uuid;
   if (UuidCreate(&system_uuid) != RPC_S_OK)
     return kFileSystemError;
-  static_assert(sizeof(system_uuid) == 16, "unexpected system uuid size");
-  static_assert(offsetof(::UUID, Data1) == 0, "unexpected uuid layout");
-  UUID uuid(reinterpret_cast<const uint8_t*>(&system_uuid.Data1));
+  UUID uuid;
+  uuid.InitializeFromSystemUUID(&system_uuid);
 
   scoped_ptr<NewReportDisk> new_report(new NewReportDisk());
   new_report->uuid = uuid;
   new_report->path =
       base_dir_.Append(kReportsDirectory)
           .Append(uuid.ToString16() + L"." + kCrashReportFileExtension);
   new_report->handle = LoggingOpenFileForWrite(new_report->path,
                                                FileWriteMode::kCreateOrFail,
                                                FilePermissions::kOwnerOnly);
   if (new_report->handle == INVALID_HANDLE_VALUE)
@@ skipping 160 matching lines @@
 // static
 scoped_ptr<CrashReportDatabase> CrashReportDatabase::Initialize(
     const base::FilePath& path) {
   scoped_ptr<CrashReportDatabaseWin> database_win(
       new CrashReportDatabaseWin(path));
   return database_win->Initialize() ? database_win.Pass()
                                     : scoped_ptr<CrashReportDatabaseWin>();
 }
 
 }  // namespace crashpad