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 7739b98398ee08b10c545cee6f9bd2c698a38fe2..6c2d35ab30285ffdd0e2ceda8af1293cb140f4d0 100644 --- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java +++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java @@ -422,6 +422,53 @@ public final class CraftMagicNumbers implements UnsafeValues { public boolean isSupportedApiVersion(String apiVersion) { return apiVersion != null && SUPPORTED_API.contains(apiVersion); } + + @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); + int dataVersion = compound.getInt("DataVersion"); + Dynamic converted = DataFixers.getDataFixer().update(References.ITEM_STACK, new Dynamic(NbtOps.INSTANCE, compound), dataVersion, getDataVersion()); + return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.of((CompoundTag) converted.getValue())); + } + + 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) + ); + } 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 /**