_HEAP_VS_CHUNK_HEADER_SIZE

Metadatacopy
union _HEAP_VS_CHUNK_HEADER_SIZE {
    struct {
        unsigned long MemoryCost : 16;/* 0x0:0  4 */
        unsigned long UnsafeSize : 16;/* 0x0:16  4 */
        unsigned long UnsafePrevSize : 16;/* 0x4:0  4 */
        unsigned long Allocated : 8;/* 0x4:16  4 */
    };/* 0x0  8 */
    unsigned short KeyUShort;/* 0x0  2 */
    unsigned long KeyULong;/* 0x0  4 */
    unsigned __int64 HeaderBits;/* 0x0  8 */
};