_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 */
    union {
        unsigned long SizeIndexAndPadding;/* 0x10  4 */
        struct {
            unsigned char SizeIndex;/* 0x10  1 */
            unsigned char GuardPagePresent;/* 0x11  1 */
            unsigned short PaddingBytes;/* 0x12  2 */
        };/* 0x10  4 */
    };/* 0x10  4 */
    unsigned long Signature;/* 0x14  4 */
    struct _HEAP_USERDATA_OFFSETS EncodedOffsets;/* 0x18  4 */
    /* 4 bytes padding */
    struct _RTL_BITMAP_EX BusyBitmap;/* 0x20  16 */
    unsigned __int64 BitmapData[1];/* 0x30  8 */
};