SubChunkPacketEntryCommon.php

<?php
 
/*
 * This file is part of BedrockProtocol.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
 *
 * BedrockProtocol 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.
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe\protocol\types;
 
use pocketmine\network\mcpe\protocol\PacketDecodeException;
use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
 
final class SubChunkPacketEntryCommon{
 
    public function __construct(
        private SubChunkPositionOffset $offset,
        private int $requestResult,
        private string $terrainData,
        private ?SubChunkPacketHeightMapInfo $heightMap
    ){}
 
    public function getOffset() : SubChunkPositionOffset{ return $this->offset; }
 
    public function getRequestResult() : int{ return $this->requestResult; }
 
    public function getTerrainData() : string{ return $this->terrainData; }
 
    public function getHeightMap() : ?SubChunkPacketHeightMapInfo{ return $this->heightMap; }
 
    public static function read(PacketSerializer $in, bool $cacheEnabled) : self{
        $offset = SubChunkPositionOffset::read($in);
 
        $requestResult = $in->getByte();
 
        $data = !$cacheEnabled || $requestResult !== SubChunkRequestResult::SUCCESS_ALL_AIR ? $in->getString() : "";
 
        $heightMapDataType = $in->getByte();
        $heightMapData = match ($heightMapDataType) {
            SubChunkPacketHeightMapType::NO_DATA => null,
            SubChunkPacketHeightMapType::DATA => SubChunkPacketHeightMapInfo::read($in),
            SubChunkPacketHeightMapType::ALL_TOO_HIGH => SubChunkPacketHeightMapInfo::allTooHigh(),
            SubChunkPacketHeightMapType::ALL_TOO_LOW => SubChunkPacketHeightMapInfo::allTooLow(),
            default => throw new PacketDecodeException("Unknown heightmap data type $heightMapDataType")
        };
 
        return new self(
            $offset,
            $requestResult,
            $data,
            $heightMapData
        );
    }
 
    public function write(PacketSerializer $out, bool $cacheEnabled) : void{
        $this->offset->write($out);
 
        $out->putByte($this->requestResult);
 
        if(!$cacheEnabled || $this->requestResult !== SubChunkRequestResult::SUCCESS_ALL_AIR){
            $out->putString($this->terrainData);
        }
 
        if($this->heightMap === null){
            $out->putByte(SubChunkPacketHeightMapType::NO_DATA);
        }elseif($this->heightMap->isAllTooLow()){
            $out->putByte(SubChunkPacketHeightMapType::ALL_TOO_LOW);
        }elseif($this->heightMap->isAllTooHigh()){
            $out->putByte(SubChunkPacketHeightMapType::ALL_TOO_HIGH);
        }else{
            $heightMapData = $this->heightMap; //avoid PHPStan purity issue
            $out->putByte(SubChunkPacketHeightMapType::DATA);
            $heightMapData->write($out);
        }
    }
}