Migrate Carpet Mixin names to mojang mappings

src/main/java/carpet/mixins/ServerboundSetStructureBlockPacketMixin.java

@@ -0,0 +1,52 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Vec3i;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.protocol.game.ServerboundSetStructureBlockPacket;
+import net.minecraft.util.Mth;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
+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;
+
+@Mixin(ServerboundSetStructureBlockPacket.class)
+public class ServerboundSetStructureBlockPacketMixin {
+    @Mutable @Final @Shadow
+    private BlockPos offset;
+    @Mutable @Final @Shadow
+    private Vec3i size;
+
+    @Inject(
+            method = "<init>(Lnet/minecraft/network/FriendlyByteBuf;)V",
+            at = @At("TAIL")
+    )
+    private void structureBlockLimitsRead(FriendlyByteBuf buf, CallbackInfo ci) {
+        if (buf.readableBytes() == 6*4) {
+            // This will throw an exception if carpet is not installed on client
+            offset = new BlockPos(Mth.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit), Mth.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit), Mth.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit));
+            size = new Vec3i(Mth.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit), Mth.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit), Mth.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit));
+        }
+    }
+
+    @Inject(
+            method = "write",
+            at = @At("TAIL")
+    )
+    private void structureBlockLimitsWrite(FriendlyByteBuf buf, CallbackInfo ci) {
+        //client method, only applicable if with carpet is on the server, or running locally
+        if (CarpetSettings.structureBlockLimit != CarpetSettings.vanillaStructureBlockLimit)
+        {
+            buf.writeInt(this.offset.getX());
+            buf.writeInt(this.offset.getY());
+            buf.writeInt(this.offset.getZ());
+            buf.writeInt(this.size.getX());
+            buf.writeInt(this.size.getY());
+            buf.writeInt(this.size.getZ());
+        }
+    }
+}