_HEAP_VS_CHUNK_HEADER_SIZE

Metadatacopy
union _HEAP_VS_CHUNK_HEADER_SIZE {
    struct {
        unsigned long MemoryCost : 1;/* 0x0:0  4 */
        unsigned long UnsafeSize : 15;/* 0x0:1  4 */
        unsigned long UnsafePrevSize : 15;/* 0x0:16  4 */
        unsigned long Allocated : 1;/* 0x0:31  4 */
    };/* 0x0  4 */
    unsigned short KeyUShort;/* 0x0  2 */
    unsigned long KeyULong;/* 0x0  4 */
    unsigned long HeaderBits;/* 0x0  4 */
};