union _HEAP_VS_CHUNK_HEADER_SIZE// Size=0x4
{
    unsigned long MemoryCost:1;// Offset=0x0 Size=0x4 BitOffset=0x0 BitSize=0x1
    unsigned long UnsafeSize:15;// Offset=0x0 Size=0x4 BitOffset=0x1 BitSize=0xf
    unsigned long UnsafePrevSize:15;// Offset=0x0 Size=0x4 BitOffset=0x10 BitSize=0xf
    unsigned long Allocated:1;// Offset=0x0 Size=0x4 BitOffset=0x1f BitSize=0x1
    unsigned short KeyUShort;// Offset=0x0 Size=0x2
    unsigned long KeyULong;// Offset=0x0 Size=0x4
    unsigned long HeaderBits;// Offset=0x0 Size=0x4
};