_HEAP_LARGE_ALLOC_DATA

Metadatacopy
struct _HEAP_LARGE_ALLOC_DATA {
    struct _RTL_BALANCED_NODE TreeNode;/* 0x0  24 */
    union {
        unsigned __int64 VirtualAddress;/* 0x18  8 */
        unsigned __int64 UnusedBytes : 16;/* 0x18:0  8 */
    };/* 0x18  8 */
    unsigned __int64 ExtraPresent : 1;/* 0x20:0  8 */
    unsigned __int64 GuardPageCount : 1;/* 0x20:1  8 */
    unsigned __int64 GuardPageAlignment : 6;/* 0x20:2  8 */
    unsigned __int64 Spare : 4;/* 0x20:8  8 */
    unsigned __int64 AllocatedPages : 52;/* 0x20:12  8 */
};