From ce9ace2a7ac7709d8af5324e5b3dffed19c13ba3 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 21 Oct 2020 05:05:41 +0200
Subject: Fix client crash when accessing stats on non-parquet clients

---
 src/main/java/re/jag/parquet/ParquetSettings.java  |  2 +
 .../parquet/mixin/StatisticsS2CPacketMixin.java    | 61 ++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 src/main/java/re/jag/parquet/mixin/StatisticsS2CPacketMixin.java

(limited to 'src/main/java')

diff --git a/src/main/java/re/jag/parquet/ParquetSettings.java b/src/main/java/re/jag/parquet/ParquetSettings.java
index 030306d..203c648 100644
--- a/src/main/java/re/jag/parquet/ParquetSettings.java
+++ b/src/main/java/re/jag/parquet/ParquetSettings.java
@@ -14,6 +14,7 @@ public class ParquetSettings {
 	public final boolean dispenser_custom_behavior;
 
 	public final boolean stats_villager_trades;
+	public final boolean stats_send_to_client;
 
 	public final boolean command_cameramode;
 	public final boolean command_stats;
@@ -30,6 +31,7 @@ public class ParquetSettings {
 		this.dispenser_custom_behavior = get_boolean("dispenser-custom-behavior", true);
 
 		this.stats_villager_trades = get_boolean("stats-villager-trades", true);
+		this.stats_send_to_client = get_boolean("stats-send-to-client", false);
 
 		this.command_cameramode = get_boolean("command-cameramode", true);
 		this.command_stats = get_boolean("command-stats", true);
diff --git a/src/main/java/re/jag/parquet/mixin/StatisticsS2CPacketMixin.java b/src/main/java/re/jag/parquet/mixin/StatisticsS2CPacketMixin.java
new file mode 100644
index 0000000..173edcb
--- /dev/null
+++ b/src/main/java/re/jag/parquet/mixin/StatisticsS2CPacketMixin.java
@@ -0,0 +1,61 @@
+package re.jag.parquet.mixin;
+
+import it.unimi.dsi.fastutil.objects.Object2IntMap;
+import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectIterator;
+import net.minecraft.network.PacketByteBuf;
+import net.minecraft.network.packet.s2c.play.StatisticsS2CPacket;
+import net.minecraft.stat.Stat;
+import net.minecraft.util.registry.Registry;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import re.jag.parquet.CustomStats;
+import re.jag.parquet.Parquet;
+
+@Mixin(StatisticsS2CPacket.class)
+public class StatisticsS2CPacketMixin {
+	@Shadow
+	private Object2IntMap<Stat<?>> stats;
+
+	@Shadow
+	private <T> int getStatId(Stat<T> stat) { return 0; }
+
+	/*
+	 * Opening the statistics menu on client causes crash with custom stats enabled.
+	 * This new write() removes all custom stats from the list sent to the client.
+	 */
+	@Inject(method="write", at=@At("HEAD"), cancellable = true)
+	protected void onWrite(PacketByteBuf buf, CallbackInfo ci){
+		if (Parquet.get_settings().stats_send_to_client)
+			return;
+
+		Object2IntMap<Stat<?>> copy = ((Object2IntOpenHashMap)stats).clone();
+
+		ObjectIterator iter = copy.object2IntEntrySet().iterator();
+
+		while (iter.hasNext()) {
+			Object2IntMap.Entry<Stat<?>> entry = (Object2IntMap.Entry)iter.next();
+			Stat<?> stat = (Stat)entry.getKey();
+
+			if( Parquet.get_settings().stats_villager_trades && stat.getType() == CustomStats.TRADED )
+				copy.removeInt(stat);
+		}
+
+		iter = copy.object2IntEntrySet().iterator();
+		buf.writeVarInt(copy.size());
+
+		while(iter.hasNext()) {
+			Object2IntMap.Entry<Stat<?>> entry = (Object2IntMap.Entry)iter.next();
+			Stat<?> stat = (Stat)entry.getKey();
+
+			buf.writeVarInt(Registry.STAT_TYPE.getRawId(stat.getType()));
+			buf.writeVarInt(this.getStatId(stat));
+			buf.writeVarInt(entry.getIntValue());
+		}
+
+		ci.cancel();
+	}
+}
-- 
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