_HEAP_USERDATA_HEADER

Metadatacopy
struct _HEAP_USERDATA_HEADER {
    union {
        struct _SINGLE_LIST_ENTRY SFreeListEntry;/* 0x0  8 */
        struct _HEAP_SUBSEGMENT* SubSegment;/* 0x0  8 */
    };/* 0x0  8 */
    void* Reserved;/* 0x8  8 */
    unsigned __int64 SizeIndex;/* 0x10  8 */
    unsigned __int64 Signature;/* 0x18  8 */
};