duct tape for block ID remapping

src/pocketmine/block/BlockFactory.php

@@ -25,6 +25,7 @@ namespace pocketmine\block;
 
 use pocketmine\item\Item;
 use pocketmine\level\Position;
+use pocketmine\utils\MainLogger;
 
 /**
  * Manages block registration and instance creation
@@ -50,6 +51,14 @@ class BlockFactory{
 	/** @var \SplFixedArray<float> */
 	public static $blastResistance = null;
 
+	/**
+	 * @var int[]
+	 */
+	public static $staticRuntimeIdMap = [];
+
+	/** @var int[] */
+	public static $legacyIdMap = [];
+
 	/**
 	 * Initializes the block factory. By default this is called only once on server start, however you may wish to use
 	 * this if you need to reset the block factory back to its original defaults for whatever reason.
@@ -326,6 +335,13 @@ class BlockFactory{
 				}
 			}
 		}
+
+		$runtimeIdMap = json_decode(file_get_contents(\pocketmine\RESOURCE_PATH . "runtimeid_table.json"), true);
+		foreach($runtimeIdMap as $obj){
+			self::$staticRuntimeIdMap[$obj["id"] << 4 | $obj["data"]] = $obj["runtimeID"];
+		}
+
+		self::$legacyIdMap = array_flip(self::$staticRuntimeIdMap);
 	}
 
 	/**
@@ -417,4 +433,34 @@ class BlockFactory{
 		$b = self::$list[$id];
 		return $b !== null and !($b instanceof UnknownBlock);
 	}
+
+	/**
+	 * @internal
+	 *
+	 * @param int $id
+	 * @param int $meta
+	 *
+	 * @return int
+	 */
+	public static function toStaticRuntimeId(int $id, int $meta = 0) : int{
+		$index = ($id << 4) | $meta;
+		if(!isset(self::$staticRuntimeIdMap[$index])){
+			MainLogger::getLogger()->error("ID $id meta $meta does not have a corresponding block runtime ID, returning AIR (0)");
+			return 0;
+		}
+
+		return self::$staticRuntimeIdMap[$index];
+	}
+
+	/**
+	 * @internal
+	 *
+	 * @param int $runtimeId
+	 *
+	 * @return int[] [id, meta]
+	 */
+	public static function fromStaticRuntimeId(int $runtimeId) : array{
+		$v = self::$legacyIdMap[$runtimeId];
+		return [$v >> 4, $v & 0xf];
+	}
 }