union _HEAP_PAGE_SEGMENT// Size=0x2000
{
    struct _LIST_ENTRY ListEntry;// Offset=0x0 Size=0x10
    unsigned long long Signature;// Offset=0x10 Size=0x8
    union _HEAP_SEGMENT_MGR_COMMIT_STATE * SegmentCommitState;// Offset=0x18 Size=0x8
    unsigned char UnusedWatermark;// Offset=0x20 Size=0x1
    struct _HEAP_PAGE_RANGE_DESCRIPTOR DescArray[256];// Offset=0x0 Size=0x2000
};