dktapps

Minecraft PE crashdump decoder

Setting up environment

Install depot_tools and make sure the tools are available in your PATH variable. You might need to add them to your path manually.

Getting a crashdump file

Requirements:

• A rooted Android device with MCPE installed.

1. Trigger the crash you want to debug. When your game crashes, DON'T RESTART IT.

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Building PocketMine-MP from source (Linux/Mac)

Pre-requisites

• Install git
• Download and install PHP >= 7.2.0 ZTS with the required extensions
  • PMMP-provided binaries
    • Prebuilt binaries for each supported platform are distributed from here.
    • If desired, our PHP build scripts can be used to build your own binary.
    • See notes about prebuilt binaries for binary paths.
  • This document will not cover the process of compiling PHP with the required extensions manually, but if you do you will need to:
• enable CLI (--enable-cli)

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{
    "minecraft:air": 0,
    "minecraft:stone": 1,
    "minecraft:grass": 2,
    "minecraft:dirt": 3,
    "minecraft:cobblestone": 4,
    "minecraft:planks": 5,
    "minecraft:sapling": 6,
    "minecraft:bedrock": 7,
    "minecraft:flowing_water": 8,

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Enabling chemistry blocks on a PocketMine-MP server

Chemistry blocks (the ones that are implemented, that is) are already present OOB with PocketMine-MP unconditionally. Unfortunately, they don't render correctly due to weirdness in the way Mojang handles the resources.

TL;DR

1. Download the manifest.json file from this gist.
2. Add it to a zip file (on Windows, right click -> Send to -> Compressed (zipped) folder)
3. Place the zip file in PocketMine-MP's resource pack folder and enable it like a normal resource pack.
4. Profit!

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#!/usr/bin/bash

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

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ListTag: value={
  CompoundTag: value={
    CompoundTag: name='old', value={
      StringTag: name='name', value='minecraft:acacia_button'
      ShortTag: name='val', value='0'
    }
    CompoundTag: name='new', value={
      StringTag: name='name', value='minecraft:acacia_button'
      CompoundTag: name='states', value={
        ByteTag: name='button_pressed_bit', value='0'

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This tool is used to generate the data found in BedrockData.

Usage

Place the script in the root of a PocketMine-MP source code repository. Make sure the composer autoloader has been appropriately generated.

php decoder.php input_file.txt

Input file

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calculating required block table diff
matched 3029 states
16 old states removed: 
CompoundTag: value={
  CompoundTag: name='block', value={
    StringTag: name='name', value='minecraft:kelp'
    CompoundTag: name='states', value={
      IntTag: name='age', value='12'
    }
  }

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This script operates on a packet dump between a vanilla client and server.

A dump like this can be obtained in various ways - a proxy, my frida tracer, etc. However you get it, the file provided should have one packet per line, starting with read: or write: and ending with a base64-encoded packet (including the packet ID).

A quick example grabbed from one of my old log files:

read:kAHwoMpB4PUgQQAAAD8g17NAAAAAPwAAAAAAAAAA4PUgQQABAg==
write:CQ==
write:CQIBG8KnZSVtdWx0aXBsYXllci5wbGF5ZXIubGVmdAELbWN0ZXN0RHlsYW4AAA==

dktapps

<?php

$opts = getopt("", ["directed", "path:"]);

$directed = isset($opts["directed"]);
$nodes = [];

class Node{
        public $name;
        public function __construct(string $name){