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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
43 lines
3 KiB
Diff
43 lines
3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
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Date: Thu, 9 Dec 2021 00:08:11 -0800
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Subject: [PATCH] Fix ChunkSnapshot#isSectionEmpty(int) and optimize
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PalettedContainer copying by not using codecs
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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index bfde7573acb6d84accfd3f7fee877bbfb3b0852f..260ca4a9c170567b27488466f802c91212997f91 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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@@ -337,13 +337,17 @@ public class CraftChunk implements Chunk {
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PalettedContainerRO<Holder<net.minecraft.world.level.biome.Biome>>[] biome = (includeBiome || includeBiomeTempRain) ? new PalettedContainer[cs.length] : null;
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Registry<net.minecraft.world.level.biome.Biome> iregistry = this.worldServer.registryAccess().registryOrThrow(Registries.BIOME);
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- Codec<PalettedContainerRO<Holder<net.minecraft.world.level.biome.Biome>>> biomeCodec = PalettedContainer.codecRO(iregistry.asHolderIdMap(), iregistry.holderByNameCodec(), PalettedContainer.Strategy.SECTION_BIOMES, iregistry.getHolderOrThrow(Biomes.PLAINS));
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for (int i = 0; i < cs.length; i++) {
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- CompoundTag data = new CompoundTag();
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- data.put("block_states", ChunkSerializer.BLOCK_STATE_CODEC.encodeStart(NbtOps.INSTANCE, cs[i].getStates()).get().left().get());
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- sectionBlockIDs[i] = ChunkSerializer.BLOCK_STATE_CODEC.parse(NbtOps.INSTANCE, data.getCompound("block_states")).get().left().get();
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+ // Paper start - Fix ChunkSnapshot#isSectionEmpty(int); and remove codec usage
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+ sectionEmpty[i] = cs[i].hasOnlyAir(); // fix sectionEmpty array not being filled
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+ if (!sectionEmpty[i]) {
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+ sectionBlockIDs[i] = cs[i].getStates().copy(); // use copy instead of round tripping with codecs
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+ } else {
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+ sectionBlockIDs[i] = CraftChunk.emptyBlockIDs; // use cached instance for empty block sections
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+ }
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+ // Paper end - Fix ChunkSnapshot#isSectionEmpty(int)
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LevelLightEngine lightengine = this.worldServer.getLightEngine();
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DataLayer skyLightArray = lightengine.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(this.x, chunk.getSectionYFromSectionIndex(i), this.z)); // SPIGOT-7498: Convert section index
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@@ -362,8 +366,7 @@ public class CraftChunk implements Chunk {
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}
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if (biome != null) {
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- data.put("biomes", biomeCodec.encodeStart(NbtOps.INSTANCE, cs[i].getBiomes()).get().left().get());
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- biome[i] = biomeCodec.parse(NbtOps.INSTANCE, data.getCompound("biomes")).get().left().get();
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+ biome[i] = ((PalettedContainer<Holder<net.minecraft.world.level.biome.Biome>>) cs[i].getBiomes()).copy(); // Paper - Perf: use copy instead of round tripping with codecs
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}
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}
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