ItemIO.cs

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using System;
using System.Collections.Generic;
using System.IO;
using Terraria.ID;
using Terraria.ModLoader.Default;
using Terraria.ModLoader.Exceptions;

namespace Terraria.ModLoader.IO
{
    public static class ItemIO
    {
        //replace netID writes in Terraria.Player.SavePlayer
        //in Terraria.IO.WorldFile.SaveChests include IsModItem for no-item check
        internal static void WriteVanillaID(Item item, BinaryWriter writer) {
            writer.Write(item.modItem != null ? 0 : item.netID);
        }

        public static TagCompound Save(Item item) {
            var tag = new TagCompound();
            if (item.type <= 0)
                return tag;

            if (item.modItem == null) {
                tag.Set("mod", "Terraria");
                tag.Set("id", item.netID);
            }
            else {
                tag.Set("mod", item.modItem.mod.Name);
                tag.Set("name", item.modItem.Name);
                tag.Set("data", item.modItem.Save());
            }

            if (item.prefix != 0 && item.prefix < PrefixID.Count)
                tag.Set("prefix", item.prefix);

            if (item.prefix >= PrefixID.Count) {
                ModPrefix modPrefix = ModPrefix.GetPrefix(item.prefix);
                if (modPrefix != null) {
                    tag.Set("modPrefixMod", modPrefix.mod.Name);
                    tag.Set("modPrefixName", modPrefix.Name);
                }
            }

            if (item.stack > 1)
                tag.Set("stack", item.stack);

            if (item.favorited)
                tag.Set("fav", true);

            tag.Set("globalData", SaveGlobals(item));

            return tag;
        }

        public static void Load(Item item, TagCompound tag)
        {
            string modName = tag.GetString("mod");
            if (modName == "") {
                item.netDefaults(0);
                return;
            }

            if (modName == "Terraria") {
                item.netDefaults(tag.GetInt("id"));
                if (tag.ContainsKey("legacyData"))
                    LoadLegacyModData(item, tag.GetByteArray("legacyData"), tag.GetBool("hasGlobalSaving"));
            }
            else {
                int type = ModLoader.GetMod(modName)?.ItemType(tag.GetString("name")) ?? 0;
                if (type > 0) {
                    item.netDefaults(type);
                    if (tag.ContainsKey("legacyData"))
                        LoadLegacyModData(item, tag.GetByteArray("legacyData"), tag.GetBool("hasGlobalSaving"));
                    else
                        item.modItem.Load(tag.GetCompound("data"));
                }
                else {
                    item.netDefaults(ModContent.ItemType<MysteryItem>());
                    ((MysteryItem)item.modItem).Setup(tag);
                }
            }

            if (tag.ContainsKey("modPrefixMod") && tag.ContainsKey("modPrefixName")) {
                string prefixMod = tag.GetString("modPrefixMod");
                string prefixName = tag.GetString("modPrefixName");
                item.Prefix(ModLoader.GetMod(prefixMod)?.PrefixType(prefixName) ?? 0);
            }
            else if (tag.ContainsKey("prefix")) {
                item.Prefix(tag.GetByte("prefix"));
            }
            item.stack = tag.Get<int?>("stack") ?? 1;
            item.favorited = tag.GetBool("fav");

            if (!(item.modItem is MysteryItem))
                LoadGlobals(item, tag.GetList<TagCompound>("globalData"));
        }

        public static Item Load(TagCompound tag) {
            var item = new Item();
            Load(item, tag);
            return item;
        }

        internal static List<TagCompound> SaveGlobals(Item item) {
            if (item.modItem is MysteryItem)
                return null; //MysteryItems cannot have global data

            var list = new List<TagCompound>();
            foreach (var globalItem in ItemLoader.globalItems) {
                var globalItemInstance = globalItem.Instance(item);
                if (!globalItemInstance.NeedsSaving(item))
                    continue;

                list.Add(new TagCompound {
                    ["mod"] = globalItemInstance.mod.Name,
                    ["name"] = globalItemInstance.Name,
                    ["data"] = globalItemInstance.Save(item)
                });
            }
            return list.Count > 0 ? list : null;
        }

        internal static void LoadGlobals(Item item, IList<TagCompound> list) {
            foreach (var tag in list) {
                var mod = ModLoader.GetMod(tag.GetString("mod"));
                var globalItem = mod?.GetGlobalItem(tag.GetString("name"));
                if (globalItem != null) {
                    var globalItemInstance = globalItem.Instance(item);
                    try {
                        globalItemInstance.Load(item, tag.GetCompound("data"));
                    }
                    catch (Exception e) {
                        throw new CustomModDataException(mod,
                            "Error in reading custom player data for " + mod.Name, e);
                    }
                }
                else {
                    item.GetGlobalItem<MysteryGlobalItem>().data.Add(tag);
                }
            }
        }

        public static void Send(Item item, BinaryWriter writer, bool writeStack = false, bool writeFavourite = false) {
            writer.Write((short)item.netID);
            writer.Write(item.prefix);
            if (writeStack) writer.Write((short)item.stack);
            if (writeFavourite) writer.Write(item.favorited);
            SendModData(item, writer);
        }

        public static void Receive(Item item, BinaryReader reader, bool readStack = false, bool readFavorite = false) {
            item.netDefaults(reader.ReadInt16());
            item.Prefix(reader.ReadByte());
            if (readStack) item.stack = reader.ReadInt16();
            if (readFavorite) item.favorited = reader.ReadBoolean();
            ReceiveModData(item, reader);
        }

        public static Item Receive(BinaryReader reader, bool readStack = false, bool readFavorite = false) {
            var item = new Item();
            Receive(item, reader, readStack, readFavorite);
            return item;
        }

        public static void SendModData(Item item, BinaryWriter writer) {
            if (item.IsAir) return;
            writer.SafeWrite(w => item.modItem?.NetSend(w));
            foreach (var globalItem in ItemLoader.NetGlobals)
                writer.SafeWrite(w => globalItem.Instance(item).NetSend(item, w));
        }

        public static void ReceiveModData(Item item, BinaryReader reader) {
            if (item.IsAir) return;
            try {
                reader.SafeRead(r => item.modItem?.NetRecieve(r));
            }
            catch (IOException e) {
                if (FrameworkVersion.Framework == Framework.Mono) {
                    Logging.tML.Error(e);
                }

                Logging.tML.Error($"Above IOException error caused by {item.modItem.Name} from the {item.modItem.mod.Name} mod.");
            }

            foreach (var globalItem in ItemLoader.NetGlobals) {
                try {
                    reader.SafeRead(r => globalItem.Instance(item).NetReceive(item, r));
                }
                catch (IOException e) {
                    if (FrameworkVersion.Framework == Framework.Mono) {
                        Logging.tML.Error(e);
                    }

                    Logging.tML.Error($"Above IOException error caused by {globalItem.Name} from the {globalItem.mod.Name} mod while reading {item.Name}.");
                }
            }
        }

        public static void LoadLegacy(Item item, BinaryReader reader, bool readStack = false, bool readFavorite = false) {
            string modName = reader.ReadString();
            bool hasGlobalSaving = false;
            if (modName.Length == 0) {
                hasGlobalSaving = true;
                modName = reader.ReadString();
            }
            if (modName == "Terraria") {
                item.netDefaults(reader.ReadInt32());
                LoadLegacyModData(item, LegacyModData(item.type, reader, hasGlobalSaving), hasGlobalSaving);
            }
            else {
                string itemName = reader.ReadString();
                int type = ModLoader.GetMod(modName)?.ItemType(itemName) ?? 0;
                byte[] data = LegacyModData(type == 0 ? int.MaxValue : type, reader, hasGlobalSaving);
                if (type != 0) {
                    item.netDefaults(type);
                    LoadLegacyModData(item, data, hasGlobalSaving);
                }
                else {
                    item.netDefaults(ModContent.ItemType<MysteryItem>());
                    var tag = new TagCompound {
                        ["mod"] = modName,
                        ["name"] = itemName,
                        ["hasGlobalSaving"] = hasGlobalSaving,
                        ["legacyData"] = data
                    };
                    ((MysteryItem)item.modItem).Setup(tag);
                }
            }

            item.Prefix(reader.ReadByte());

            if (readStack)
                item.stack = reader.ReadInt32();

            if (readFavorite)
                item.favorited = reader.ReadBoolean();
        }

        internal static byte[] LegacyModData(int type, BinaryReader reader, bool hasGlobalSaving = true) {
            using (MemoryStream memoryStream = new MemoryStream()) {
                using (BinaryWriter writer = new BinaryWriter(memoryStream)) {
                    if (type >= ItemID.Count) {
                        ushort length = reader.ReadUInt16();
                        writer.Write(length);
                        writer.Write(reader.ReadBytes(length));
                    }
                    if (hasGlobalSaving) {
                        ushort count = reader.ReadUInt16();
                        writer.Write(count);
                        for (int k = 0; k < count; k++) {
                            writer.Write(reader.ReadString());
                            writer.Write(reader.ReadString());
                            ushort length = reader.ReadUInt16();
                            writer.Write(length);
                            writer.Write(reader.ReadBytes(length));
                        }
                    }
                }
                return memoryStream.ToArray();
            }
        }

        internal static void LoadLegacyModData(Item item, byte[] data, bool hasGlobalSaving = true) {
            using (BinaryReader reader = new BinaryReader(new MemoryStream(data))) {
                if (item.modItem != null) {
                    byte[] modData = reader.ReadBytes(reader.ReadUInt16());
                    if (modData.Length > 0) {
                        using (BinaryReader customReader = new BinaryReader(new MemoryStream(modData))) {
                            try {
                                item.modItem.LoadLegacy(customReader);
                            }
                            catch (Exception e) {
                                throw new CustomModDataException(item.modItem.mod,
                                    "Error in reading custom item data for " + item.modItem.mod.Name, e);
                            }
                        }
                    }
                }
                if (hasGlobalSaving) {
                    int count = reader.ReadUInt16();
                    for (int k = 0; k < count; k++) {
                        string modName = reader.ReadString();
                        string globalName = reader.ReadString();
                        byte[] globalData = reader.ReadBytes(reader.ReadUInt16());
                        GlobalItem globalItem = ModLoader.GetMod(modName)?.GetGlobalItem(globalName);
                        //could support legacy global data in mystery globals but eh...
                        if (globalItem != null && globalData.Length > 0) {
                            using (BinaryReader customReader = new BinaryReader(new MemoryStream(globalData))) {
                                try {
                                    globalItem.LoadLegacy(item, customReader);
                                }
                                catch (Exception e) {
                                    throw new CustomModDataException(globalItem.mod,
                                        "Error in reading custom global item data for " + globalItem.mod.Name, e);
                                }
                            }
                        }
                    }
                }
            }
        }

        public static void LoadLegacyInventory(Item[] inv, BinaryReader reader, bool readStack = false, bool readFavorite = false) {
            int count = reader.ReadUInt16();
            for (int k = 0; k < count; k++) {
                LoadLegacy(inv[reader.ReadUInt16()], reader, readStack, readFavorite);
            }
        }

        public static string ToBase64(Item item) {
            MemoryStream ms = new MemoryStream();
            TagIO.ToStream(ItemIO.Save(item), ms, true);
            return Convert.ToBase64String(ms.ToArray());
        }

        public static Item FromBase64(string base64) {
            MemoryStream ms = new MemoryStream(Convert.FromBase64String(base64));
            return ItemIO.Load(TagIO.FromStream(ms, true));
        }
    }
}