source: binary-improvements/7dtd-server-fixes/src/PersistentData/Inventory.cs

using System;
using System.Collections.Generic;

namespace AllocsFixes.PersistentData {
        [Serializable]
        public class Inventory {
                public List<InvItem> bag;
                public List<InvItem> belt;
                public InvItem[] equipment;

                public Inventory () {
                        bag = new List<InvItem> ();
                        belt = new List<InvItem> ();
                        equipment = null;
                }

                public void Update (PlayerDataFile _pdf) {
                        lock (this) {
                                //Log.Out ("Updating player inventory - player id: " + pdf.id);
                                ProcessInv (bag, _pdf.bag, _pdf.id);
                                ProcessInv (belt, _pdf.inventory, _pdf.id);
                                ProcessEqu (_pdf.equipment, _pdf.id);
                        }
                }

                private void ProcessInv (ICollection<InvItem> _target, IReadOnlyList<ItemStack> _sourceFields, int _id) {
                        _target.Clear ();
                        for (int i = 0; i < _sourceFields.Count; i++) {
                                InvItem item = CreateInvItem (_sourceFields [i].itemValue, _sourceFields [i].count, _id);
                                if (item != null && _sourceFields [i].itemValue.Modifications != null) {
                                        ProcessParts (_sourceFields [i].itemValue.Modifications, item, _id);
                                }

                                _target.Add (item);
                        }
                }

                private void ProcessEqu (Equipment _sourceEquipment, int _playerId) {
                        equipment = new InvItem[_sourceEquipment.GetSlotCount ()];
                        for (int i = 0; i < _sourceEquipment.GetSlotCount (); i++) {
                                equipment [i] = CreateInvItem (_sourceEquipment.GetSlotItem (i), 1, _playerId);
                        }
                }

                private void ProcessParts (IReadOnlyList<ItemValue> _parts, InvItem _item, int _playerId) {
                        InvItem[] itemParts = new InvItem[_parts.Count];
                        for (int i = 0; i < _parts.Count; i++) {
                                InvItem partItem = CreateInvItem (_parts [i], 1, _playerId);
                                if (partItem != null && _parts [i].Modifications != null) {
                                        ProcessParts (_parts [i].Modifications, partItem, _playerId);
                                }

                                itemParts [i] = partItem;
                        }

                        _item.parts = itemParts;
                }

                private InvItem CreateInvItem (ItemValue _itemValue, int _count, int _playerId) {
                        if (_count <= 0 || _itemValue == null || _itemValue.Equals (ItemValue.None)) {
                                return null;
                        }

                        ItemClass itemClass = ItemClass.list [_itemValue.type];
                        int maxAllowed = itemClass.Stacknumber.Value;
                        string name = itemClass.GetItemName ();

                        if (_count > maxAllowed) {
                                Log.Out ($"Player with ID {_playerId} has stack for \"{name}\" greater than allowed ({_count} > {maxAllowed})");
                        }

                        InvItem item;
                        if (_itemValue.HasQuality) {
                                item = new InvItem (name, _count, _itemValue.Quality, _itemValue.MaxUseTimes, _itemValue.UseTimes);
                        } else {
                                item = new InvItem (name, _count, -1, _itemValue.MaxUseTimes, _itemValue.UseTimes);
                        }

                        item.icon = itemClass.GetIconName ();

                        item.iconcolor = AllocsUtils.ColorToHex (itemClass.GetIconTint ());

                        return item;
                }
        }
}