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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.
44 lines
3.0 KiB
Diff
44 lines
3.0 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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