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PaperMC/patches/server/Fix-possible-StackOverflowError-and-NPE-for-some-dis.patch
Nassim Jahnke 2c2dadf75b More more more more work
2024-12-03 20:34:55 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sat, 29 Oct 2022 17:02:42 -0700
Subject: [PATCH] Fix possible StackOverflowError and NPE for some dispenses
For saddles, carpets, horse armor, and chests for horse-likes
a BlockDispenseEvent handler that always mutated the item without
changing the type would result in a SO error because when it went
to find the replacement dispense behavior (since the item "changed")
it didn't properly handle if the replacement was the same instance
of dispense behavior.
Additionally equippable mob heads, wither skulls, and carved pumpkins
are subject to the same possible error.
Furthermore since 1.21.2, the DISPENSER_REGISTRY map doesn't have a default
return value anymore and some dispense behaviors like equippable and
regular items will not have a defined behavior in that map and might throw
a NPE in that case.
diff --git a/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/BoatDispenseItemBehavior.java
@@ -0,0 +0,0 @@ public class BoatDispenseItemBehavior extends DefaultDispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
diff --git a/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
@@ -0,0 +0,0 @@ public class DefaultDispenseItemBehavior implements DispenseItemBehavior {
if (!dropper && !event.getItem().getType().equals(craftItem.getType())) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(sourceblock, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior.getClass() != DefaultDispenseItemBehavior.class) {
idispensebehavior.dispense(sourceblock, eventStack);
} else {
diff --git a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != EquipmentDispenseItemBehavior.INSTANCE) {
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
idispensebehavior.dispense(pointer, eventStack);
return stack;
}
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != EquipmentDispenseItemBehavior.INSTANCE) {
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
idispensebehavior.dispense(pointer, eventStack);
return stack;
}
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.shrink(1);
this.setSuccess(true);
} else {
- this.setSuccess(EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack));
+ this.setSuccess(EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack, this)); // Paper - fix possible StackOverflowError
}
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
stack.shrink(1);
this.setSuccess(true);
} else {
- this.setSuccess(EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack));
+ this.setSuccess(EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack, this)); // Paper - fix possible StackOverflowError
}
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
@@ -0,0 +0,0 @@ public interface DispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != EquipmentDispenseItemBehavior.INSTANCE) {
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
idispensebehavior.dispense(pointer, eventStack);
return stack;
}
diff --git a/src/main/java/net/minecraft/core/dispenser/EquipmentDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/EquipmentDispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/EquipmentDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/EquipmentDispenseItemBehavior.java
@@ -0,0 +0,0 @@ public class EquipmentDispenseItemBehavior extends DefaultDispenseItemBehavior {
@Override
protected ItemStack execute(BlockSource pointer, ItemStack stack) {
- return EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack) ? stack : super.execute(pointer, stack);
+ return EquipmentDispenseItemBehavior.dispenseEquipment(pointer, stack, this) ? stack : super.execute(pointer, stack); // Paper - fix possible StackOverflowError
}
- public static boolean dispenseEquipment(BlockSource pointer, ItemStack stack) {
+ @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper
+ public static boolean dispenseEquipment(BlockSource pointer, ItemStack armor) {
+ // Paper start
+ return dispenseEquipment(pointer, armor, null);
+ }
+ public static boolean dispenseEquipment(BlockSource pointer, ItemStack stack, @javax.annotation.Nullable DispenseItemBehavior currentBehavior) {
BlockPos blockposition = pointer.pos().relative((Direction) pointer.state().getValue(DispenserBlock.FACING));
List<LivingEntity> list = pointer.level().getEntitiesOfClass(LivingEntity.class, new AABB(blockposition), (entityliving) -> {
return entityliving.canEquipWithDispenser(stack);
@@ -0,0 +0,0 @@ public class EquipmentDispenseItemBehavior extends DefaultDispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != EquipmentDispenseItemBehavior.INSTANCE) {
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
+ if (idispensebehavior != DispenseItemBehavior.NOOP && (currentBehavior == null || idispensebehavior != currentBehavior)) { // Paper - fix possible StackOverflowError
idispensebehavior.dispense(pointer, eventStack);
return true;
}
diff --git a/src/main/java/net/minecraft/core/dispenser/MinecartDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/MinecartDispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/MinecartDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/MinecartDispenseItemBehavior.java
@@ -0,0 +0,0 @@ public class MinecartDispenseItemBehavior extends DefaultDispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
diff --git a/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java b/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ProjectileDispenseBehavior.java
@@ -0,0 +0,0 @@ public class ProjectileDispenseBehavior extends DefaultDispenseItemBehavior {
stack.grow(1);
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
diff --git a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -0,0 +0,0 @@ public class ShearsDispenseItemBehavior extends OptionalDispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
diff --git a/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShulkerBoxDispenseBehavior.java
@@ -0,0 +0,0 @@ public class ShulkerBoxDispenseBehavior extends OptionalDispenseItemBehavior {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ DispenseItemBehavior idispensebehavior = DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
idispensebehavior.dispense(pointer, eventStack);
return stack;
diff --git a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
@@ -0,0 +0,0 @@ public class DispenserBlock extends BaseEntityBlock {
}
}
+ // Paper start - Fix NPE with equippable and items without behavior
+ public static DispenseItemBehavior getDispenseBehavior(BlockSource pointer, ItemStack stack) {
+ return ((DispenserBlock) pointer.state().getBlock()).getDispenseMethod(pointer.level(), stack);
+ }
+ // Paper end - Fix NPE with equippable and items without behavior
+
protected DispenseItemBehavior getDispenseMethod(Level world, ItemStack stack) {
if (!stack.isItemEnabled(world.enabledFeatures())) {
return DispenserBlock.DEFAULT_BEHAVIOR;
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -0,0 +0,0 @@ public class CraftEventFactory {
if (!event.getItem().equals(craftItem)) {
// Chain to handler for new item
ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
- net.minecraft.core.dispenser.DispenseItemBehavior itemBehavior = net.minecraft.world.level.block.DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+ net.minecraft.core.dispenser.DispenseItemBehavior itemBehavior = net.minecraft.world.level.block.DispenserBlock.getDispenseBehavior(pointer, eventStack); // Paper - Fix NPE with equippable and items without behavior
if (itemBehavior != net.minecraft.core.dispenser.DispenseItemBehavior.NOOP && itemBehavior != instance) {
itemBehavior.dispense(pointer, eventStack);
return itemStack;
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