Level rewrite middle step

src/pocketmine/level/format/anvil/Anvil.php

@@ -21,9 +21,9 @@
 
 namespace pocketmine\level\format\anvil;
 
-use pocketmine\level\format\LevelFormat;
+use pocketmine\level\format\generic\BaseLevelProvider;
 
-class Anvil implements LevelFormat{
+class Anvil extends BaseLevelProvider{
 	protected $basePath;
 
 	public function __construct($path, $levelName){

src/pocketmine/level/format/anvil/Chunk.php

@@ -22,6 +22,7 @@
 namespace pocketmine\level\format\anvil;
 
 use pocketmine\level\format\generic\BaseChunk;
+use pocketmine\level\format\generic\EmptyChunkSection;
 use pocketmine\level\Level;
 use pocketmine\nbt\NBT;
 use pocketmine\nbt\tag\Compound;
@@ -72,4 +73,34 @@ class Chunk extends BaseChunk{
 
 		parent::__construct($level, $this->nbt["xPos"], $this->nbt["zPos"], $sections);
 	}
+
+	public function getChunkSnapshot($includeMaxBlockY = true, $includeBiome = false, $includeBiomeTemp = false){
+		$blockId = "";
+		$blockData = "";
+		$blockSkyLight = "";
+		$blockLight = "";
+		$emptySections = [false, false, false, false, false, false, false, false];
+
+		$emptyBlocks = str_repeat("\x00", 4096);
+		$emptyHalf = str_repeat("\x00", 2048);
+
+		foreach($this->sections as $i => $section){
+			if($section instanceof EmptyChunkSection){
+				$blockId .= $emptyBlocks;
+				$blockData .= $emptyHalf;
+				$blockSkyLight .= $emptyHalf;
+				$blockLight .= $emptyHalf;
+				$emptySections[$i] = true;
+			}else{
+				$blockId .= $section->getIdArray();
+				$blockData .= $section->getDataArray();
+				$blockSkyLight .= $section->getSkyLightArray();
+				$blockLight .= $section->getLightArray();
+			}
+		}
+
+		//TODO: maxBlockY, biomeMap, biomeTemp
+
+		return new ChunkSnapshot($this->getX(), $this->getZ(), $this->getLevel()->getName(), $this->getLevel()->getTime(), $blockId, $blockData, $blockSkyLight, $blockLight, $emptySections, null, null, null, null);
+	}
 }

src/pocketmine/level/format/anvil/ChunkSection.php

@@ -150,4 +150,20 @@ class ChunkSection implements \pocketmine\level\format\ChunkSection{
 		return $column;
 	}
 
+	public function getIdArray(){
+		return $this->blocks;
+	}
+
+	public function getDataArray(){
+		return $this->data;
+	}
+
+	public function getSkyLightArray(){
+		return $this->skyLight;
+	}
+
+	public function getLightArray(){
+		return $this->blockLight;
+	}
+
 }

src/pocketmine/level/format/anvil/ChunkSnapshot.php

@@ -0,0 +1,78 @@
+<?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/
+ *
+ *
+*/
+
+namespace pocketmine\level\format\anvil;
+
+use pocketmine\level\format\generic\BaseChunkSnapshot;
+
+class ChunkSnapshot extends BaseChunkSnapshot{
+
+	public function getBlockId($x, $y, $z){
+		return ord($this->blockId{
+			(($y >> 4) << 12) //get section index
+			+ ($y << 8) + ($z << 4) + $x //get block index in section
+		});
+	}
+
+	public function getBlockData($x, $y, $z){
+		$data = ord($this->blockData{
+		(($y >> 4) << 11) //get section index
+		+ ($y << 7) + ($z << 3) + ($x >> 1) //get block index in section
+		});
+		if(($y & 1) === 0){
+			return $data & 0x0F;
+		}else{
+			return $data >> 4;
+		}
+	}
+
+	public function getBlockSkyLight($x, $y, $z){
+		$level = ord($this->skyLight{
+		(($y >> 4) << 11) //get section index
+		+ ($y << 7) + ($z << 3) + ($x >> 1) //get block index in section
+		});
+		if(($y & 1) === 0){
+			return $level & 0x0F;
+		}else{
+			return $level >> 4;
+		}
+	}
+
+	public function getBlockLight($x, $y, $z){
+		$level = ord($this->light{
+		(($y >> 4) << 11) //get section index
+		+ ($y << 7) + ($z << 3) + ($x >> 1) //get block index in section
+		});
+		if(($y & 1) === 0){
+			return $level & 0x0F;
+		}else{
+			return $level >> 4;
+		}
+	}
+
+	public function getBiome(){
+		return 0; //TODO
+	}
+
+	public function getHighestBlockAt($x, $z){
+		return 127; //TODO
+	}
+}