Removed pocketmine subdirectory, map PSR-4 style

src/world/format/io/region/LegacyAnvilChunkTrait.php

@@ -0,0 +1,99 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\world\format\io\region;
+
+use pocketmine\nbt\BigEndianNbtSerializer;
+use pocketmine\nbt\NbtDataException;
+use pocketmine\nbt\tag\CompoundTag;
+use pocketmine\nbt\tag\IntArrayTag;
+use pocketmine\nbt\tag\ListTag;
+use pocketmine\world\format\Chunk;
+use pocketmine\world\format\io\ChunkUtils;
+use pocketmine\world\format\io\exception\CorruptedChunkException;
+use pocketmine\world\format\SubChunk;
+
+/**
+ * Trait containing I/O methods for handling legacy Anvil-style chunks.
+ *
+ * Motivation: In the future PMAnvil will become a legacy read-only format, but Anvil will continue to exist for the sake
+ * of handling worlds in the PC 1.13 format. Thus, we don't want PMAnvil getting accidentally influenced by changes
+ * happening to the underlying Anvil, because it only uses the legacy part.
+ *
+ * @internal
+ */
+trait LegacyAnvilChunkTrait{
+
+	protected function serializeChunk(Chunk $chunk) : string{
+		throw new \RuntimeException("Unsupported");
+	}
+
+	/**
+	 * @param string $data
+	 *
+	 * @return Chunk
+	 * @throws CorruptedChunkException
+	 */
+	protected function deserializeChunk(string $data) : Chunk{
+		$nbt = new BigEndianNbtSerializer();
+		try{
+			$chunk = $nbt->readCompressed($data)->getTag();
+		}catch(NbtDataException $e){
+			throw new CorruptedChunkException($e->getMessage(), 0, $e);
+		}
+		if(!$chunk->hasTag("Level")){
+			throw new CorruptedChunkException("'Level' key is missing from chunk NBT");
+		}
+
+		$chunk = $chunk->getCompoundTag("Level");
+
+		$subChunks = [];
+		$subChunksTag = $chunk->getListTag("Sections") ?? [];
+		foreach($subChunksTag as $subChunk){
+			if($subChunk instanceof CompoundTag){
+				$subChunks[$subChunk->getByte("Y")] = $this->deserializeSubChunk($subChunk);
+			}
+		}
+
+		if($chunk->hasTag("BiomeColors", IntArrayTag::class)){
+			$biomeIds = ChunkUtils::convertBiomeColors($chunk->getIntArray("BiomeColors")); //Convert back to original format
+		}else{
+			$biomeIds = $chunk->getByteArray("Biomes", "", true);
+		}
+
+		$result = new Chunk(
+			$chunk->getInt("xPos"),
+			$chunk->getInt("zPos"),
+			$subChunks,
+			$chunk->hasTag("Entities", ListTag::class) ? $chunk->getListTag("Entities")->getValue() : [],
+			$chunk->hasTag("TileEntities", ListTag::class) ? $chunk->getListTag("TileEntities")->getValue() : [],
+			$biomeIds
+		);
+		$result->setPopulated($chunk->getByte("TerrainPopulated", 0) !== 0);
+		$result->setGenerated();
+		return $result;
+	}
+
+	abstract protected function deserializeSubChunk(CompoundTag $subChunk) : SubChunk;
+
+}