RtlAreBitsSetEx

BOOL __fastcall RtlAreBitsSetEx(_RTL_BITMAP_EX *BitMapHeader, UINT64 StartingIndex, UINT64 Length){
  unsigned __int64 *Buffer; 
  char v6; 
  unsigned __int64 *v7; 
  unsigned __int64 v8; 
  unsigned __int64 *v9; 

  if( StartingIndex >= BitMapHeader->SizeOfBitMap )
    return 0;
  if( Length <= 1 )
  {
    if( Length == 1 )
      return _bittest64((const signed __int64 *)BitMapHeader->Buffer, StartingIndex);
    return 0;
  }
  if( BitMapHeader->SizeOfBitMap - StartingIndex < Length )
    return 0;
  Buffer = BitMapHeader->Buffer;
  v6 = StartingIndex + Length - 1;
  v7 = &Buffer[StartingIndex >> 6];
  v8 = *v7;
  v9 = &Buffer[(StartingIndex + Length - 1) >> 6];
  if( v7 == v9 )
    return((0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)Length) << StartingIndex) & v8) == 0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)Length) << StartingIndex;
  if( ((-1i64 << StartingIndex) & v8) != -1i64 << StartingIndex )
    return 0;
  while( ++v7 != v9 )
  {
    if( *v7 != -1i64 )
      return 0;
  }
  return((0xFFFFFFFFFFFFFFFFui64 >> ~v6) & *v7) == 0xFFFFFFFFFFFFFFFFui64 >> ~v6;
}

Referenced by: