ExpWnfGenerateStateName

ntfs-wnf-8.c

__int64 __fastcall ExpWnfGenerateStateName(unsigned __int64 *StateName, int NameLifetime, int DataScope, char PersistData)
{
  char v5; // si
  __int64 v8; // rbx
  __int64 v9; // rax
  signed __int64 v10; // rdx
  bool v11; // zf
  unsigned __int64 Sequence; // rdx
  __int64 result; // rax
  unsigned __int64 v14[3]; // [rsp+20h] [rbp-18h] BYREF

  v14[0] = 0i64;
  v5 = DataScope;
  if ( (unsigned int)(DataScope - 4) > 1 )
  {
    v8 = PsGetCurrentServerSilo();
    v9 = PsGetCurrentServerSiloGlobals();
  }
  else
  {
    v8 = HalSystemVectorDispatchEntry();
    v9 = PsGetServerSiloGlobals(v8);
  }
  if ( (unsigned int)(NameLifetime - 2) > 1 )
  {
    result = ExpWnfAllocateNextPersistentNameSequence(v8, v14);
    if ( (int)result < 0 )
      return result;
    Sequence = v14[0];
  }
  else
  {
    do
    {
      v10 = _InterlockedExchangeAdd64((volatile signed __int64 *)(v9 + 960), 1ui64);
      v11 = v10 == -1;
      Sequence = v10 + 1;
      v14[0] = Sequence;
    }
    while ( v11 );
  }
  if ( (Sequence & 0xFFE0000000000000ui64) != 0 )
    return 0xC0000001i64;
  *StateName = (16 * ((Sequence << 7) | NameLifetime & 3)) | ((PersistData != 0 ? 0x400 : 0) | ((v5 & 0xF) << 6)) & 0x7FE | 1;
  return 0i64;
}