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https://github.com/pmmp/PocketMine-MP.git
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84 lines
2.5 KiB
PHP
84 lines
2.5 KiB
PHP
<?php
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/*
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*
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* ____ _ _ __ __ _ __ __ ____
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* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
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* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
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* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
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* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* @author PocketMine Team
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* @link http://www.pocketmine.net/
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*
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*
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*/
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declare(strict_types=1);
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namespace pocketmine\network\mcpe\compression;
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use pocketmine\utils\SingletonTrait;
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use pocketmine\utils\Utils;
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use function function_exists;
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use function libdeflate_deflate_compress;
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use function strlen;
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use function zlib_decode;
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use function zlib_encode;
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use const ZLIB_ENCODING_RAW;
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final class ZlibCompressor implements Compressor{
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use SingletonTrait;
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public const DEFAULT_LEVEL = 7;
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public const DEFAULT_THRESHOLD = 256;
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public const DEFAULT_MAX_DECOMPRESSION_SIZE = 2 * 1024 * 1024;
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/**
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* @see SingletonTrait::make()
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*/
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private static function make() : self{
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return new self(self::DEFAULT_LEVEL, self::DEFAULT_THRESHOLD, self::DEFAULT_MAX_DECOMPRESSION_SIZE);
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}
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public function __construct(
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private int $level,
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private ?int $minCompressionSize,
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private int $maxDecompressionSize
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){}
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public function getCompressionThreshold() : ?int{
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return $this->minCompressionSize;
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}
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/**
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* @throws DecompressionException
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*/
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public function decompress(string $payload) : string{
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$result = @zlib_decode($payload, $this->maxDecompressionSize);
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if($result === false){
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throw new DecompressionException("Failed to decompress data");
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}
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return $result;
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}
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private static function zlib_encode(string $data, int $level) : string{
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return Utils::assumeNotFalse(zlib_encode($data, ZLIB_ENCODING_RAW, $level), "ZLIB compression failed");
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}
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public function compress(string $payload) : string{
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$compressible = $this->minCompressionSize !== null && strlen($payload) >= $this->minCompressionSize;
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if(function_exists('libdeflate_deflate_compress')){
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return $compressible ?
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libdeflate_deflate_compress($payload, $this->level) :
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self::zlib_encode($payload, 0);
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}
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return self::zlib_encode($payload, $compressible ? $this->level : 0);
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}
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}
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