win: fixes for Windows x64

minidump/test/minidump_rva_list_test_util.cc

 // Copyright 2014 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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "minidump/test/minidump_rva_list_test_util.h"
 
 #include <windows.h>
 #include <dbghelp.h>
 
 #include "minidump/minidump_extensions.h"
 #include "minidump/test/minidump_writable_test_util.h"
 
 namespace crashpad {
 namespace test {
 
 const MinidumpRVAList* MinidumpRVAListAtStart(const std::string& file_contents,
                                               size_t count) {
   MINIDUMP_LOCATION_DESCRIPTOR location_descriptor;
-  location_descriptor.DataSize = sizeof(MinidumpRVAList) + count * sizeof(RVA);
+  location_descriptor.DataSize =
+      static_cast<uint32_t>(sizeof(MinidumpRVAList) + count * sizeof(RVA));
   location_descriptor.Rva = 0;
 
   const MinidumpRVAList* list =
       MinidumpWritableAtLocationDescriptor<MinidumpRVAList>(
           file_contents, location_descriptor);
   if (!list) {
     return nullptr;
   }
 
   if (list->count != count) {
     EXPECT_EQ(count, list->count);
     return nullptr;
   }
 
   return list;
 }
 
 }  // namespace test
 }  // namespace crashpad