copy
//0x48 bytes (sizeof)
struct _HEAP_LFH_SUBSEGMENT
{
    struct _LIST_ENTRY ListEntry;                                           //0x0
    union _HEAP_LFH_SUBSEGMENT_STATE State;                                 //0x10
    union
    {
        struct _SINGLE_LIST_ENTRY OwnerFreeListEntry;                       //0x18
        struct
        {
            UCHAR CommitStateOffset;                                        //0x18
            UCHAR Spare0:4;                                                 //0x19
        };
    };
    USHORT FreeCount;                                                       //0x20
    USHORT BlockCount;                                                      //0x22
    UCHAR FreeHint;                                                         //0x24
    UCHAR WitheldBlockCount;                                                //0x25
    union
    {
        struct
        {
            UCHAR CommitUnitShift;                                          //0x26
            UCHAR CommitUnitCount;                                          //0x27
        };
        union _HEAP_LFH_COMMIT_UNIT_INFO CommitUnitInfo;                    //0x26
    };
    struct _HEAP_LFH_SUBSEGMENT_ENCODED_OFFSETS BlockOffsets;               //0x28
    USHORT BucketRef;                                                       //0x2c
    USHORT PrivateSlotMapRef;                                               //0x2e
    USHORT HighWatermarkBlockIndex;                                         //0x30
    UCHAR BitmapSearchWidth;                                                //0x32
    union
    {
        struct
        {
            UCHAR PrivateFormat:1;                                          //0x33
            UCHAR Spare1:7;                                                 //0x33
        };
        union _HEAP_LFH_SUBSEGMENT_UCHAR_FIELDS UChar;                      //0x33
    };
    ULONG Spare3;                                                           //0x34
    ULONGLONG CommitLock;                                                   //0x38
    ULONGLONG BlockBitmap[1];                                               //0x40
};