From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Mariell Hoversholm Date: Thu, 30 Apr 2020 16:56:54 +0200 Subject: [PATCH] Add Raw Byte ItemStack Serialization Serializes using NBT which is safer for server data migrations than bukkits format. diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java index d11773ed44936f8836f2f8e582d5e9573af5b439..ef4b15e0ae11a54ec49e40f1d694dae58ae95e03 100644 --- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java +++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java @@ -473,6 +473,53 @@ public final class CraftMagicNumbers implements UnsafeValues { public com.destroystokyo.paper.util.VersionFetcher getVersionFetcher() { return new com.destroystokyo.paper.PaperVersionFetcher(); } + + @Override + public byte[] serializeItem(ItemStack item) { + Preconditions.checkNotNull(item, "null cannot be serialized"); + Preconditions.checkArgument(item.getType() != Material.AIR, "air cannot be serialized"); + + return serializeNbtToBytes((item instanceof CraftItemStack ? ((CraftItemStack) item).handle : CraftItemStack.asNMSCopy(item)).save(new CompoundTag())); + } + + @Override + public ItemStack deserializeItem(byte[] data) { + Preconditions.checkNotNull(data, "null cannot be deserialized"); + Preconditions.checkArgument(data.length > 0, "cannot deserialize nothing"); + + CompoundTag compound = deserializeNbtFromBytes(data); + final int dataVersion = compound.getInt("DataVersion"); + compound = (CompoundTag) MinecraftServer.getServer().fixerUpper.update(References.ITEM_STACK, new Dynamic<>(NbtOps.INSTANCE, compound), dataVersion, this.getDataVersion()).getValue(); + return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.of(compound)); + } + + private byte[] serializeNbtToBytes(CompoundTag compound) { + compound.putInt("DataVersion", getDataVersion()); + java.io.ByteArrayOutputStream outputStream = new java.io.ByteArrayOutputStream(); + try { + net.minecraft.nbt.NbtIo.writeCompressed( + compound, + outputStream + ); + } catch (IOException ex) { + throw new RuntimeException(ex); + } + return outputStream.toByteArray(); + } + + private CompoundTag deserializeNbtFromBytes(byte[] data) { + CompoundTag compound; + try { + compound = net.minecraft.nbt.NbtIo.readCompressed( + new java.io.ByteArrayInputStream(data), net.minecraft.nbt.NbtAccounter.unlimitedHeap() + ); + } catch (IOException ex) { + throw new RuntimeException(ex); + } + int dataVersion = compound.getInt("DataVersion"); + Preconditions.checkArgument(dataVersion <= getDataVersion(), "Newer version! Server downgrades are not supported!"); + return compound; + } // Paper end /**