struct _HEAP_VIRTUAL_ALLOC_ENTRY// Size=0x20
{
    struct _LIST_ENTRY Entry;// Offset=0x0 Size=0x8
    struct _HEAP_ENTRY_EXTRA ExtraStuff;// Offset=0x8 Size=0x8
    unsigned long CommitSize;// Offset=0x10 Size=0x4
    unsigned long ReserveSize;// Offset=0x14 Size=0x4
    struct _HEAP_ENTRY BusyBlock;// Offset=0x18 Size=0x8
};