struct VolumeData {
UINT volumeGuidHash;
DWORD getVolumeInformationError;
DWORD fileSystemFlags;
DWORD volumeSerialNumber;
UINT volumeNameHash;
UINT fileSystemNameHash;
WORD driveType;
WORD volumePathNameLength;
DWORD volumePathNameHash;
}; // sizeof(VolumeData) == 32

struct VacProcessMonitorMapping {
DWORD magic; // when initialized - 0x30004
PVOID vacProcessMonitor;
}; // sizeof(VacProcessMonitorMapping) == 8

if (method_ptr & 0xFFFF0000 != steamservice_base)
hook_detected();