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//0x20 bytes (sizeof)
struct _HEAP_VAMGR_RANGE
{
    union
    {
        struct _RTL_BALANCED_NODE RbNode;                                   //0x0
        struct _SINGLE_LIST_ENTRY Next;                                     //0x0
        struct
        {
            UCHAR Allocated:1;                                              //0x0
            UCHAR Internal:1;                                               //0x0
            UCHAR Standalone:1;                                             //0x0
            UCHAR Spare0:5;                                                 //0x0
            UCHAR AllocatorIndex;                                           //0x1
            USHORT CommitBitmap;                                            //0x2
            ULONGLONG OwnerCtx[2];                                          //0x8
        };
    };
    union
    {
        ULONGLONG SizeInChunks;                                             //0x18
        struct
        {
            USHORT ChunkCount;                                              //0x18
            USHORT PrevChunkCount;                                          //0x1a
        };
        ULONGLONG Signature;                                                //0x18
    };
};