public void Load(string fileName, bool replaceTiles)
        {
            if (!File.Exists(fileName))
            {
                throw new Exception(string.Format("File not found {0}.", fileName));
            }

            string spawnFile     = null;
            string houseFile     = null;
            var    tileLocations = new HashSet <ulong>();

            using (var reader = new OtFileReader(fileName)) {
                OtFileNode node = reader.GetRootNode();

                OtPropertyReader props = reader.GetPropertyReader(node);

                props.ReadByte(); // junk?

                var version = props.ReadUInt32();
                props.ReadUInt16();
                props.ReadUInt16();

                var majorVersionItems = props.ReadUInt32();
                var minorVersionItems = props.ReadUInt32();

                if (version <= 0)
                {
                    //In otbm version 1 the count variable after splashes/fluidcontainers and stackables
                    //are saved as attributes instead, this solves alot of problems with items
                    //that is changed (stackable/charges/fluidcontainer/splash) during an update.
                    throw new Exception(
                              "This map needs to be upgraded by using the latest map editor version to be able to load correctly.");
                }

                if (version > 3)
                {
                    throw new Exception("Unknown OTBM version detected.");
                }

                if (majorVersionItems < 3)
                {
                    throw new Exception(
                              "This map needs to be upgraded by using the latest map editor version to be able to load correctly.");
                }

                if (majorVersionItems > Items.MajorVersion)
                {
                    throw new Exception("The map was saved with a different items.otb version, an upgraded items.otb is required.");
                }

                if (minorVersionItems > Items.MinorVersion)
                {
                    Trace.WriteLine("This map needs an updated items.otb.");
                }

                node = node.Child;

                if ((OtMapNodeTypes)node.Type != OtMapNodeTypes.MAP_DATA)
                {
                    throw new Exception("Could not read data node.");
                }

                props = reader.GetPropertyReader(node);

                while (props.PeekChar() != -1)
                {
                    byte attribute = props.ReadByte();
                    switch ((OtMapAttribute)attribute)
                    {
                    case OtMapAttribute.DESCRIPTION:
                        var description = props.GetString();
                        //Descriptions.Add(description);
                        break;

                    case OtMapAttribute.EXT_SPAWN_FILE:
                        spawnFile = props.GetString();
                        break;

                    case OtMapAttribute.EXT_HOUSE_FILE:
                        houseFile = props.GetString();
                        break;

                    default:
                        throw new Exception("Unknown header node.");
                    }
                }

                OtFileNode nodeMapData = node.Child;

                while (nodeMapData != null)
                {
                    switch ((OtMapNodeTypes)nodeMapData.Type)
                    {
                    case OtMapNodeTypes.TILE_AREA:
                        ParseTileArea(reader, nodeMapData, replaceTiles, tileLocations);
                        break;

                    case OtMapNodeTypes.TOWNS:
                        ParseTowns(reader, nodeMapData);
                        break;
                    }
                    nodeMapData = nodeMapData.Next;
                }
            }
        }
        public void LoadOtb(string fileName)
        {
            if (!File.Exists(fileName))
            {
                throw new Exception(string.Format("File not found {0}.", fileName));
            }

            using (var reader = new OtFileReader(fileName)) {
                var node = reader.GetRootNode();
                OtPropertyReader props = reader.GetPropertyReader(node);

                props.ReadByte(); //junk?
                props.ReadUInt32();

                byte attr = props.ReadByte();
                if ((RootAttr)attr == RootAttr.ROOT_ATTR_VERSION)
                {
                    var datalen = props.ReadUInt16();

                    if (datalen != 140)
                    {
                        throw new Exception("Size of version header is invalid.");
                    }

                    MajorVersion = props.ReadUInt32();
                    MinorVersion = props.ReadUInt32();
                    BuildNumber  = props.ReadUInt32();
                }

                if (MajorVersion == 0xFFFFFFFF)
                {
                    Trace.WriteLine("[Warning] items.otb using generic client version.");
                }

                node = node.Child;

                while (node != null)
                {
                    props = reader.GetPropertyReader(node);

                    OtItemType item      = new OtItemType();
                    byte       itemGroup = (byte)node.Type;

                    switch ((OtbItemGroup)itemGroup)
                    {
                    case OtbItemGroup.NONE: item.Group = OtItemGroup.None; break;

                    case OtbItemGroup.GROUND: item.Group = OtItemGroup.Ground; break;

                    case OtbItemGroup.SPLASH: item.Group = OtItemGroup.Splash; break;

                    case OtbItemGroup.FLUID: item.Group = OtItemGroup.FluidContainer; break;

                    case OtbItemGroup.CONTAINER: item.Group = OtItemGroup.Container; break;

                    case OtbItemGroup.DEPRECATED: item.Group = OtItemGroup.Deprecated; break;

                    default: break;
                    }

                    OtbItemFlags flags = (OtbItemFlags)props.ReadUInt32();

                    item.BlockObject     = ((flags & OtbItemFlags.BLOCK_SOLID) == OtbItemFlags.BLOCK_SOLID);
                    item.BlockProjectile = ((flags & OtbItemFlags.BLOCK_PROJECTILE) == OtbItemFlags.BLOCK_PROJECTILE);
                    item.BlockPathFind   = ((flags & OtbItemFlags.BLOCK_PATHFIND) == OtbItemFlags.BLOCK_PATHFIND);
                    item.IsPickupable    = ((flags & OtbItemFlags.PICKUPABLE) == OtbItemFlags.PICKUPABLE);
                    item.IsMoveable      = ((flags & OtbItemFlags.MOVEABLE) == OtbItemFlags.MOVEABLE);
                    item.IsStackable     = ((flags & OtbItemFlags.STACKABLE) == OtbItemFlags.STACKABLE);
                    item.AlwaysOnTop     = ((flags & OtbItemFlags.ALWAYSONTOP) == OtbItemFlags.ALWAYSONTOP);
                    item.IsVertical      = ((flags & OtbItemFlags.VERTICAL) == OtbItemFlags.VERTICAL);
                    item.IsHorizontal    = ((flags & OtbItemFlags.HORIZONTAL) == OtbItemFlags.HORIZONTAL);
                    item.IsHangable      = ((flags & OtbItemFlags.HANGABLE) == OtbItemFlags.HANGABLE);
                    item.IsRotatable     = ((flags & OtbItemFlags.ROTABLE) == OtbItemFlags.ROTABLE);
                    item.IsReadable      = ((flags & OtbItemFlags.READABLE) == OtbItemFlags.READABLE);
                    item.HasUseWith      = ((flags & OtbItemFlags.USEABLE) == OtbItemFlags.USEABLE);
                    item.HasHeight       = ((flags & OtbItemFlags.HAS_HEIGHT) == OtbItemFlags.HAS_HEIGHT);
                    item.LookThrough     = ((flags & OtbItemFlags.LOOKTHROUGH) == OtbItemFlags.LOOKTHROUGH);
                    item.AllowDistRead   = ((flags & OtbItemFlags.ALLOWDISTREAD) == OtbItemFlags.ALLOWDISTREAD);
                    item.IsAnimation     = ((flags & OtbItemFlags.ANIMATION) == OtbItemFlags.ANIMATION);
                    item.WalkStack       = ((flags & OtbItemFlags.WALKSTACK) == OtbItemFlags.WALKSTACK);

                    while (props.PeekChar() != -1)
                    {
                        byte   attribute = props.ReadByte();
                        UInt16 datalen   = props.ReadUInt16();

                        switch ((OtbItemAttr)attribute)
                        {
                        case OtbItemAttr.ITEM_ATTR_SERVERID:
                            if (datalen != sizeof(UInt16))
                            {
                                throw new Exception("Unexpected data length of server id block (Should be 2 bytes)");
                            }

                            item.Id = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_CLIENTID:
                            if (datalen != sizeof(UInt16))
                            {
                                throw new Exception("Unexpected data length of client id block (Should be 2 bytes)");
                            }

                            item.SpriteId = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_WAREID:
                            if (datalen != sizeof(UInt16))
                            {
                                throw new Exception("Unexpected data length of ware id block (Should be 2 bytes)");
                            }

                            item.WareId = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_SPEED:
                            if (datalen != sizeof(UInt16))
                            {
                                throw new Exception("Unexpected data length of speed block (Should be 2 bytes)");
                            }

                            item.GroundSpeed = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_NAME:
                            item.Name = new string(props.ReadChars(datalen));
                            break;

                        case OtbItemAttr.ITEM_ATTR_SPRITEHASH:
                            if (datalen != 16)
                            {
                                throw new Exception("Unexpected data length of sprite hash (Should be 16 bytes)");
                            }

                            item.SpriteHash = props.ReadBytes(16);
                            break;

                        case OtbItemAttr.ITEM_ATTR_MINIMAPCOLOR:
                            if (datalen != 2)
                            {
                                throw new Exception("Unexpected data length of minimap color (Should be 2 bytes)");
                            }

                            item.MinimapColor = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_07:
                            //read/write-able
                            if (datalen != 2)
                            {
                                throw new Exception("Unexpected data length of attr 07 (Should be 2 bytes)");
                            }

                            item.MaxReadWriteChars = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_08:
                            //readable
                            if (datalen != 2)
                            {
                                throw new Exception("Unexpected data length of attr 08 (Should be 2 bytes)");
                            }

                            item.MaxReadChars = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_LIGHT2:
                            if (datalen != sizeof(UInt16) * 2)
                            {
                                throw new Exception("Unexpected data length of item light (2) block");
                            }

                            item.LightLevel = props.ReadUInt16();
                            item.LightColor = props.ReadUInt16();
                            break;

                        case OtbItemAttr.ITEM_ATTR_TOPORDER:
                            if (datalen != sizeof(byte))
                            {
                                throw new Exception("Unexpected data length of item toporder block (Should be 1 byte)");
                            }

                            item.AlwaysOnTopOrder = props.ReadByte();
                            break;

                        default:
                            //skip unknown attributes
                            props.ReadBytes(datalen);
                            break;
                        }
                    }

                    AddItem(item);
                    node = node.Next;
                }
            }
        }