Add LoggingSeekFile

util/file/file_io_win.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,
@@ skipping 85 matching lines @@
       disposition = CREATE_NEW;
       break;
   }
   HANDLE file = CreateFile(path.value().c_str(), GENERIC_WRITE, 0, nullptr,
                            disposition, FILE_ATTRIBUTE_NORMAL, nullptr);
   PLOG_IF(ERROR, file == INVALID_HANDLE_VALUE) << "CreateFile "
                                                << path.value().c_str();
   return file;
 }
 
+FileOffset LoggingSeekFile(FileHandle file, FileOffset offset, int whence) {
+  DWORD method = 0;
+  switch (whence) {
+    case SEEK_SET:
+      method = FILE_BEGIN;
+      break;
+    case SEEK_CUR:
+      method = FILE_CURRENT;
+      break;
+    case SEEK_END:
+      method = FILE_END;
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+
+  LARGE_INTEGER distance_to_move;
+  distance_to_move.QuadPart = offset;
+  LARGE_INTEGER new_offset;
+  BOOL result = SetFilePointerEx(file, distance_to_move, &new_offset, method);
+  if (!result) {
+    PLOG(ERROR) << "SetFilePointerEx";
+    return -1;
+  }
+  return new_offset.QuadPart;
+}
+
 bool LoggingCloseFile(FileHandle file) {
   BOOL rv = CloseHandle(file);
   PLOG_IF(ERROR, !rv) << "CloseHandle";
   return rv;
 }
 
 }  // namespace crashpad