From adbf56d7545f9f24fc4eb5c963d2540214498602 Mon Sep 17 00:00:00 2001
From: Shoghi Cervantes Pueyo <shoghicp@gmail.com>
Date: Tue, 18 Dec 2012 17:05:28 +0100
Subject: [PATCH] Implemented Java String.hashCode() for level seed

---
 classes/API/ServerAPI.php |  10 +++
 classes/Java.class.php    | 126 ++++++++++++++++++++++++++++++++++++++
 common/dependencies.php   |   1 +
 3 files changed, 137 insertions(+)
 create mode 100644 classes/Java.class.php

diff --git a/classes/API/ServerAPI.php b/classes/API/ServerAPI.php
index c5259f9b2..f6520ae49 100644
--- a/classes/API/ServerAPI.php
+++ b/classes/API/ServerAPI.php
@@ -241,6 +241,16 @@ class ServerAPI extends stdClass{ //Yay! I can add anything to this class in run
 					$v = (int) $v;
 					break;
 				case "seed":
+					$v = trim($v);
+					if($v == "false"){
+						$v = false;
+					}elseif(preg_match("/[^0-9\-]/", $v) > 0){
+						$str = new Java_String($v);
+						$v = $str->hashCode();
+					}else{
+						$v = (int) $v;
+					}
+					break;
 				case "server-id":
 					$v = trim($v);
 					$v = $v == "false" ? false:(preg_match("/[^0-9\-]/", $v) > 0 ? Utils::readInt(substr(md5($v, true), 0, 4)):$v);
diff --git a/classes/Java.class.php b/classes/Java.class.php
new file mode 100644
index 000000000..b7c9564bf
--- /dev/null
+++ b/classes/Java.class.php
@@ -0,0 +1,126 @@
+<?php
+
+/*
+
+           -
+         /   \
+      /         \
+   /    POCKET     \
+/    MINECRAFT PHP    \
+|\     @shoghicp     /|
+|.   \           /   .|
+| ..     \   /     .. |
+|    ..    |    ..    |
+|       .. | ..       |
+\          |          /
+   \       |       /
+      \    |    /
+         \ | /
+
+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.
+
+
+*/
+
+
+class Java_String{
+	private $value = "", $count = 0, $hash = 0;
+	
+	public function __construct($string = false){
+		if($string !== false){
+			$this->value = (string) $string;
+			$this->count = strlen($this->value);
+		}
+	}
+	
+	public function __toString(){
+		return $this->value;
+	}
+	
+	public function lenght(){
+		return $this->count;
+	}
+	
+	public function isEmpty(){
+		return $this->count === 0;
+	}
+	
+	public function charAt($index){
+		$index = (int) $index;
+		if($index < 0 or $index >= $this->count){
+			trigger_error("Undefined offset $index", E_USER_WARNING);
+			return false;
+		}
+		return $this->value{$index};
+	}
+	
+	public function hashCode(){
+		$h = $this->hash;
+		if($h === 0 and $this->count > 0){
+			for($i = 0; $i < $this->count; ++$i){
+				$h = (($h << 5) - $h) + ord($this->charAt($i));
+				$h = $h & $h;
+				$this->hash = $h;
+			}
+			$this->hash = $h;
+		}
+		return $h;
+	}	
+}
+
+
+class Java_Random{
+	private $haveNextNextGaussian, $nextNextGaussian, $seed, $n1, $n2, $n3, $zero;
+	
+	public function __construct($seed = false){
+		$this->n1 = new Math_BigInteger(0x5DEECE66D);
+		$this->n2 = new Math_BigInteger(1);
+		$this->n2 = $this->n2->bitwise_leftShift(48)->subtract($this->n2);
+		$this->n3 = new Math_BigInteger(0xB);
+		$this->zero = new Math_BigInteger(0);
+		if($seed === false){
+			$seed = microtime(true) * 1000000;
+		}
+		$this->setSeed($seed);
+	}
+	
+	public function setSeed($seed){
+		$seed = new Math_BigInteger($seed);
+		$this->seed = $seed->bitwise_xor($this->n1)->bitwise_and($this->n2);
+		$this->haveNextNextGaussian = false;
+	}
+	
+	protected function next($bits){
+		$bits = (int) $bits;
+		$this->seed = $this->seed->multiply($this->n1)->add($this->n3)->bitwise_and($this->n2);
+		return $this->_tripleRightShift($this->seed, (48 - $bits));
+	}
+	
+	private function _tripleRightShift($number, $places){
+		if($number->compare($this->zero) >= 0){
+			return $number->bitwise_rightShift($places);
+		}
+		$n1 = new Math_BigInteger(2);
+		return $number->bitwise_rightShift($places)->add($n1->bitwise_leftShift(~$places));
+	}
+	
+	public function nextBytes($bytes){
+		$bytes = (int) $bytes;
+		$b = b"";
+		$max = $bytes & ~0x3;
+		for($i = 0; $i < $max; $i += 4){
+			$b .= $this->next(32)->toBytes();
+		}
+		if($max < $bytes){
+			$random = $this->next(32)->toBytes();
+			for($j = $max; $j < $bytes; ++$j){
+				$b .= $random{$j-$max};
+			}
+		}
+		return $b;
+	}
+
+}
\ No newline at end of file
diff --git a/common/dependencies.php b/common/dependencies.php
index ab18b0826..4808204d6 100644
--- a/common/dependencies.php
+++ b/common/dependencies.php
@@ -74,6 +74,7 @@ require_once("classes/Packet.class.php");
 require_once("classes/Entity.class.php");
 require_once("classes/ChunkParser.class.php");
 require_once("classes/NBT.class.php");
+require_once("classes/Java.class.php");
 require_once("classes/SerializedPacketHandler.class.php");
 require_once("classes/CustomPacketHandler.class.php");
 require_once("classes/MinecraftInterface.class.php");