Simplify directory structure

bot.py

@@ -13,14 +13,14 @@ SERVER = os.environ['SERVER']
 
 import monkey_patch # must be before any possible pyCraft imports
 
-from custom.managers import DataManager, ChunksManager, ChatManager
 
 from minecraft import authentication
 from minecraft.exceptions import YggdrasilError
 from minecraft.networking.connection import Connection
 from minecraft.networking.packets import Packet, clientbound, serverbound
 
-from custom.networking.packets.clientbound.play.block_change_packet import BlockChangePacket
+from protocol.managers import DataManager, ChunksManager, ChatManager, ChunkNotLoadedException
+from protocol.packets import BlockChangePacket
 
 from bunch import Bunch
 from panda3d.core import LPoint3f, LVector3f
@@ -53,7 +53,7 @@ def tick(global_state):
 
     try:
         g.chunks.get_block_at(*utils.pint(p))
-    except chunks.ChunkNotLoadedException:
+    except ChunkNotLoadedException:
         return
 
     #l.jobstate.run()
@@ -161,7 +161,7 @@ def bot(global_state):
     g = global_state
     g.local_state = Bunch()
 
-    if 'mcdata' not in g:
+    if not g.mcdata:
         g.mcdata = DataManager('./mcdata')
 
     if not g.connection:
@@ -175,19 +175,16 @@ def bot(global_state):
         g.connection = Connection(SERVER, 25565, auth_token=auth_token)
 
         g.chunks = ChunksManager(g.mcdata)
-        g.chunks.register(g.connection)
-
-        g.chat = ChatManager()
-        g.chat.register(g.connection)
 
         g.connection.connect()
 
     def packet_wrapper(handler):
         def wrapper(packet):
-            print('Wrapper:', handler)
             handler(packet, g)
         return wrapper
 
+    g.chunks.register(g.connection)
+
     h1 = packet_wrapper(packet_handlers.handle_join_game)
     g.connection.register_packet_listener(h1, clientbound.play.JoinGamePacket)
 
@@ -197,6 +194,10 @@ def bot(global_state):
     h3 = packet_wrapper(packet_handlers.handle_block_change)
     g.connection.register_packet_listener(h3, BlockChangePacket)
 
+    g.chat = ChatManager(g)
+    h4 = packet_wrapper(packet_handlers.handle_chat)
+    g.chat.set_handler(h4)
+
     try:
         while not g.pos:
             time.sleep(TICK)
@@ -207,9 +208,7 @@ def bot(global_state):
             time.sleep(TICK)
         print('Chunks loaded.')
 
-        print('init..')
         init(g)
-        print('done init')
 
         while g.running:
             tick(g)

custom/managers/__init__.py

@@ -1,3 +0,0 @@
-from .data import DataManager
-from .chunks import ChunksManager
-from .chat import ChatManager

custom/managers/chat.py

@@ -1,36 +0,0 @@
-import json
-
-from minecraft.networking.packets import clientbound, serverbound
-
-class ChatManager:
-
-    def __init__(self):
-        return
-
-    def translate_chat(self, data):
-        if isinstance(data, str):
-            return data
-        elif 'extra' in data:
-            return "".join([self.translate_chat(x) for x in data['extra']])
-        elif 'text' in data:
-            return data['text']
-        else:
-            return "?"
-
-    def print_chat(self, chat_packet):
-        # TODO: Replace with handler
-        try:
-            print("[%s] %s"%(chat_packet.field_string('position'), self.translate_chat(json.loads(chat_packet.json_data))))
-        except Exception as ex:
-            print("Exception %r on message (%s): %s" % (ex, chat_packet.field_string('position'), chat_packet.json_data))
-    
-    def register(self, connection):
-        connection.register_packet_listener(self.print_chat, clientbound.play.ChatMessagePacket)
-    
-    def send(self, connection, text):
-        if not text:
-            # Prevents connection bug when sending empty chat message
-            return
-        packet = serverbound.play.ChatPacket()
-        packet.message = text
-        connection.write_packet(packet)

custom/managers/chunks.py

@@ -1,97 +0,0 @@
-from math import floor
-
-from ..networking.packets.clientbound.play import block_change_packet, chunk_data
-
-class ChunksManager:
-
-    def __init__(self, data_manager):
-        self.data = data_manager
-        self.chunks = {}
-        self.biomes = {}
-        
-    def handle_block(self, block_packet):
-        self.set_block_at(block_packet.location.x, block_packet.location.y, block_packet.location.z, block_packet.block_state_id)
-        #self.print_chunk(self.get_chunk(floor(block_packet.location.x/16), floor(block_packet.location.y/16), floor(block_packet.location.z/16)), block_packet.location.y%16)
-        #print('Block %s at %s'%(blocks_states[block_packet.block_state_id], block_packet.location))
-
-    def handle_multiblock(self, multiblock_packet):
-        for b in multiblock_packet.records:
-            self.handle_block(b)
-
-    def handle_chunk(self, chunk_packet):
-        for i in chunk_packet.chunks:
-            self.chunks[(chunk_packet.x, i, chunk_packet.z)] = chunk_packet.chunks[i]        
-        self.biomes[(chunk_packet.x, None, chunk_packet.z)] = chunk_packet.biomes # FIXME
-
-    def register(self, connection):
-        connection.register_packet_listener(self.handle_block, block_change_packet.BlockChangePacket)
-        connection.register_packet_listener(self.handle_multiblock, block_change_packet.MultiBlockChangePacket)
-        connection.register_packet_listener(self.handle_chunk, chunk_data.ChunkDataPacket)
-
-    def get_chunk(self, x, y, z):
-        index = (x, y, z)
-        if not index in self.chunks:
-            raise ChunkNotLoadedException(index)
-        return self.chunks[index]
-
-    def get_loaded_area(self, ignore_empty=False):
-        first = next(iter(self.chunks.keys()))
-        x0 = x1 = first[0]
-        y0 = y1 = first[1]
-        z0 = z1 = first[2]
-        for k in self.chunks.keys():
-            if ignore_empty and self.chunks[k].empty:
-                continue
-            x0 = min(x0, k[0])
-            x1 = max(x1, k[0])
-            y0 = min(y0, k[1])
-            y1 = max(y1, k[1])
-            z0 = min(z0, k[2])
-            z1 = max(z1, k[2])
-        return ((x0,y0,z0),(x1,y1,z1))
-
-    def get_block_at(self, x, y, z):
-        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
-        return c.get_block_at(x%16, y%16, z%16)
-
-    def set_block_at(self, x, y, z, block):
-        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
-        c.set_block_at(x%16, y%16, z%16, block)
-
-    def print_chunk(self, chunk, y_slice):
-        print("This is chunk %d %d %d at slice %d:"%(chunk.x, chunk.y, chunk.z, y_slice))
-        print("+%s+"%("-"*16))
-        for z in range(16):
-            missing = []
-            print("|", end="")
-            for x in range(16):
-                sid = chunk.get_block_at(x, y_slice, z)
-                bloc = self.data.blocks_states[sid]
-                if bloc == "minecraft:air" or bloc == "minecraft:cave_air":
-                    c = " "
-                elif bloc == "minecraft:grass_block" or bloc == "minecraft:dirt":
-                    c = "-"
-                elif bloc == "minecraft:water":
-                    c = "~"
-                elif bloc == "minecraft:lava":
-                    c = "!"
-                elif bloc == "minecraft:bedrock":
-                    c = "_"
-                elif bloc == "minecraft:stone":
-                    c = "X"
-                else:
-                    missing.append(bloc)
-                    c = "?"
-
-                print(c, end="")
-            print("|  %s"%(",".join(missing)))
-        print("+%s+"%("-"*16))
-        if chunk.entities:
-            print("Entities in slice: %s"%(", ".join([x['id'].decode() for x in chunk.entities])))
-
-
-class ChunkNotLoadedException(Exception):
-    def __str__(self):
-        pos = self.args[0]
-        return "Chunk at %d %d %d not loaded (yet?)"%(pos[0], pos[1], pos[2])
-

custom/managers/data.py

@@ -1,32 +0,0 @@
-import os
-import json
-
-class DataManager:
-
-    def __init__(self, directory):
-        self.blocks = {}
-        self.blocks_states = {}
-        self.blocks_properties = {}
-        self.registries = {}
-        self.biomes = {}
-        self.entity_type = {}
-        
-        if not os.path.isdir(directory):
-            raise FileNotFoundError("%s is not a valid directory")
-
-        if not os.path.isfile("%s/registries.json"%(directory)):
-            raise FileNotFoundError("%s is not a valid minecraft data directory")
-        
-        with open("%s/blocks.json"%(directory)) as f:
-            blocks = json.loads(f.read())
-        for x in blocks:
-            for s in blocks[x]['states']:
-                self.blocks_states[s['id']] = x
-                self.blocks_properties[s['id']] = s.get('properties', {})
-
-        with open("%s/registries.json"%(directory)) as f:
-            registries = json.loads(f.read())
-        #for x in registries["minecraft:biome"]["entries"]:
-        #    self.biomes[registries["minecraft:biome"]["entries"][x]["protocol_id"]] = x
-        for x in registries["minecraft:entity_type"]["entries"]:
-            self.entity_type[registries["minecraft:entity_type"]["entries"][x]["protocol_id"]] = x

custom/networking/packets/clientbound/play/block_change_packet.py

@@ -1,112 +0,0 @@
-from minecraft.networking.packets import Packet
-from minecraft.networking.types import (
-    VarInt, Integer, UnsignedByte, Position, Vector, MutableRecord,
-    attribute_alias, multi_attribute_alias, Long, Boolean, VarLong,
-)
-
-
-class BlockChangePacket(Packet):
-    id = 0x0B
-    packet_name = 'block change'
-    definition = [
-        {'location': Position},
-        {'block_state_id': VarInt}]
-    block_state_id = 0
-
-    # For protocols < 347: an accessor for (block_state_id >> 4).
-    @property
-    def blockId(self):
-        return self.block_state_id >> 4
-
-    @blockId.setter
-    def blockId(self, block_id):
-        self.block_state_id = (self.block_state_id & 0xF) | (block_id << 4)
-
-    # For protocols < 347: an accessor for (block_state_id & 0xF).
-    @property
-    def blockMeta(self):
-        return self.block_state_id & 0xF
-
-    @blockMeta.setter
-    def blockMeta(self, meta):
-        self.block_state_id = (self.block_state_id & ~0xF) | (meta & 0xF)
-
-    # This alias is retained for backward compatibility.
-    blockStateId = attribute_alias('block_state_id')
-
-
-class MultiBlockChangePacket(Packet):
-    id = 0x3B
-    packet_name = 'multi block change'
-
-    fields = 'chunk_x', 'chunk_z', 'records'
-
-    # Access the 'chunk_x' and 'chunk_z' fields as a tuple.
-    chunk_pos = multi_attribute_alias(tuple, 'chunk_x', 'chunk_z')
-
-    class Record(MutableRecord):
-        __slots__ = 'x', 'y', 'z', 'block_state_id', 'location'
-
-        def __init__(self, **kwds):
-            self.block_state_id = 0
-            super(MultiBlockChangePacket.Record, self).__init__(**kwds)
-
-        # Access the 'x', 'y', 'z' fields as a Vector of ints.
-        position = multi_attribute_alias(Vector, 'x', 'y', 'z')
-
-        # For protocols < 347: an accessor for (block_state_id >> 4).
-        @property
-        def blockId(self):
-            return self.block_state_id >> 4
-
-        @blockId.setter
-        def blockId(self, block_id):
-            self.block_state_id = self.block_state_id & 0xF | block_id << 4
-
-        # For protocols < 347: an accessor for (block_state_id & 0xF).
-        @property
-        def blockMeta(self):
-            return self.block_state_id & 0xF
-
-        @blockMeta.setter
-        def blockMeta(self, meta):
-            self.block_state_id = self.block_state_id & ~0xF | meta & 0xF
-
-        # This alias is retained for backward compatibility.
-        blockStateId = attribute_alias('block_state_id')
-
-        def read(self, file_object, parent):
-            data = VarLong.read(file_object)
-            self.block_state_id = int(data >> 12)
-            self.x = int(data >> 8 & 0xf)
-            self.z = int(data >> 4 & 0xf)
-            self.y = int(data & 0xf)
-            # Absolute position in world to be compatible with BlockChangePacket
-            self.location = Vector(self.position.x + parent.chunk_x*16, self.position.y, self.position.z + parent.chunk_z*16)
-
-        def write(self, packet_buffer):
-            raise
-            UnsignedByte.send(self.x << 4 | self.z & 0xF, packet_buffer)
-            UnsignedByte.send(self.y, packet_buffer)
-            VarInt.send(self.block_state_id, packet_buffer)
-
-    def read(self, file_object):
-        coords = Long.read(file_object)
-        self.chunk_x = int(coords >> 42 & 0x3fffff)
-        self.chunk_z = int(coords >> 20 & 0x3fffff)
-        self.chunk_y = int(coords & 0xfffff)
-        self.unknown = Boolean.read(file_object)
-        array_size = VarInt.read(file_object)
-        self.records = []
-        for i in range(array_size):
-            record = self.Record()
-            record.read(file_object, self)
-            self.records.append(record)
-
-    def write_fields(self, packet_buffer):
-        raise
-        Integer.send(self.chunk_x, packet_buffer)
-        Integer.send(self.chunk_z, packet_buffer)
-        VarInt.send(len(self.records), packet_buffer)
-        for record in self.records:
-            record.write(packet_buffer)

custom/networking/types/basic.py

@@ -1,12 +0,0 @@
-from minecraft.networking.types.basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray
-
-class IntegerPrefixedByteArray(Type):
-    @staticmethod
-    def read(file_object):
-        length = Integer.read(file_object)
-        return struct.unpack(str(length) + "s", file_object.read(length))[0]
-
-    @staticmethod
-    def send(value, socket):
-        Integer.send(len(value), socket)
-        socket.send(value)

main.py

@@ -1,6 +1,7 @@
 import importlib
 import threading
 import time
+import traceback
 
 from flask import Flask
 app = Flask(__name__)
@@ -15,6 +16,7 @@ global_state = Bunch()
 g = global_state
 g.local_state = False
 g.connection = False
+g.mcdata = False
 g.pos = False
 
 @app.route('/')
@@ -42,9 +44,16 @@ def main():
 
     try:
         while True:
-            g.running = True
-            bot.bot(global_state)
-            importlib.reload(bot)
+            try:
+                g.running = True
+                bot.bot(global_state)
+                importlib.reload(bot)
+            except BaseException as e:
+                g.running = True
+                traceback.print_exc()
+                print('Locking...')
+                while g.running:
+                    time.sleep(1)
     except KeyboardInterrupt:
         observer.stop()
     observer.join()

monkey_patch.py

@@ -1,17 +1,17 @@
 import minecraft.networking.packets
-from custom.networking.packets.clientbound.play import chunk_data, block_change_packet
+from protocol import packets
 
 def get_packets(old_get_packets):
     def wrapper(func, context):
         print('Monkey-patch worked.')
-        packets = func(context)
+        mc_packets = func(context)
 
         # add any custom packets here
-        packets.add(chunk_data.ChunkDataPacket)
-        packets.add(block_change_packet.BlockChangePacket)
-        packets.add(block_change_packet.MultiBlockChangePacket)
+        mc_packets.add(packets.ChunkDataPacket)
+        mc_packets.add(packets.BlockChangePacket)
+        mc_packets.add(packets.MultiBlockChangePacket)
 
-        return packets
+        return mc_packets
     return lambda x: wrapper(old_get_packets, x)
 
 minecraft.networking.packets.clientbound.play.get_packets = get_packets(minecraft.networking.packets.clientbound.play.get_packets)

packet_handlers.py

@@ -1,8 +1,11 @@
+import re
 import time
 import importlib
 
 from panda3d.core import LPoint3f
 
+from minecraft.networking.packets import Packet, clientbound, serverbound
+
 import utils
 importlib.reload(utils)
 import path
@@ -15,8 +18,6 @@ def handle_join_game(packet, g):
 
 def handle_block_change(packet, g):
     l = g.local_state
-    print('block change:')
-    print(packet)
 
     if packet.block_state_id == 3887:
         try:
@@ -47,3 +48,52 @@ def handle_position_and_look(packet, g):
     print(packet)
     p = LPoint3f(x=packet.x, y=packet.y, z=packet.z)
     g.pos = p
+
+def handle_chat(message, g):
+    source, text = message
+    reply = None
+
+    match = re.match(r'<(\w+)> (.*)', text)
+    if match:
+        sender, text = match.groups()
+    else:
+        return
+
+    if text.startswith('! '):
+        text = text[2:]
+    elif text.startswith('!'):
+        text = text[1:]
+    else:
+        return
+
+    if ' ' in text:
+        command = text.split(' ', 1)[0]
+        data = text.split(' ', 1)[1]
+    else:
+        command = text
+
+    if command == 'ping':
+        reply = 'pong'
+
+    if command == 'echo' and data:
+        reply = data
+
+    if command == 'respawn':
+        packet = serverbound.play.ClientStatusPacket()
+        packet.action_id = serverbound.play.ClientStatusPacket.RESPAWN
+        g.connection.write_packet(packet)
+        reply = 'ok'
+
+    if command == 'pos':
+        reply = str(utils.pint(g.pos))[1:-1]
+
+    if command == 'afk':
+        reply = '/afk'
+
+    if command == 'error':
+        reply = 'ok'
+        raise
+
+    if reply:
+        print(reply)
+        g.chat.send(reply)

protocol/managers.py

@@ -0,0 +1,140 @@
+import os
+from math import floor
+import json
+
+from minecraft.networking.packets import clientbound, serverbound
+from protocol import packets
+
+class DataManager:
+    def __init__(self, directory):
+        self.blocks = {}
+        self.blocks_states = {}
+        self.blocks_properties = {}
+        self.registries = {}
+        self.biomes = {}
+        self.entity_type = {}
+        
+        if not os.path.isdir(directory):
+            raise FileNotFoundError("%s is not a valid directory")
+
+        if not os.path.isfile("%s/registries.json"%(directory)):
+            raise FileNotFoundError("%s is not a valid minecraft data directory")
+        
+        with open("%s/blocks.json"%(directory)) as f:
+            blocks = json.loads(f.read())
+        for x in blocks:
+            for s in blocks[x]['states']:
+                self.blocks_states[s['id']] = x
+                self.blocks_properties[s['id']] = s.get('properties', {})
+
+        with open("%s/registries.json"%(directory)) as f:
+            registries = json.loads(f.read())
+        #for x in registries["minecraft:biome"]["entries"]:
+        #    self.biomes[registries["minecraft:biome"]["entries"][x]["protocol_id"]] = x
+        for x in registries["minecraft:entity_type"]["entries"]:
+            self.entity_type[registries["minecraft:entity_type"]["entries"][x]["protocol_id"]] = x
+
+
+class ChunksManager:
+    def __init__(self, data_manager):
+        self.data = data_manager
+        self.chunks = {}
+        self.biomes = {}
+
+    def handle_block(self, block_packet):
+        self.set_block_at(block_packet.location.x, block_packet.location.y, block_packet.location.z, block_packet.block_state_id)
+        #self.print_chunk(self.get_chunk(floor(block_packet.location.x/16), floor(block_packet.location.y/16), floor(block_packet.location.z/16)), block_packet.location.y%16)
+        #print('Block %s at %s'%(blocks_states[block_packet.block_state_id], block_packet.location))
+
+    def handle_multiblock(self, multiblock_packet):
+        for b in multiblock_packet.records:
+            self.handle_block(b)
+
+    def handle_chunk(self, chunk_packet):
+        for i in chunk_packet.chunks:
+            self.chunks[(chunk_packet.x, i, chunk_packet.z)] = chunk_packet.chunks[i]        
+        self.biomes[(chunk_packet.x, None, chunk_packet.z)] = chunk_packet.biomes # FIXME
+
+    def register(self, connection):
+        connection.register_packet_listener(self.handle_block, packets.BlockChangePacket)
+        connection.register_packet_listener(self.handle_multiblock, packets.MultiBlockChangePacket)
+        connection.register_packet_listener(self.handle_chunk, packets.ChunkDataPacket)
+
+    def get_chunk(self, x, y, z):
+        index = (x, y, z)
+        if not index in self.chunks:
+            raise ChunkNotLoadedException(index)
+        return self.chunks[index]
+
+    def get_loaded_area(self, ignore_empty=False):
+        first = next(iter(self.chunks.keys()))
+        x0 = x1 = first[0]
+        y0 = y1 = first[1]
+        z0 = z1 = first[2]
+        for k in self.chunks.keys():
+            if ignore_empty and self.chunks[k].empty:
+                continue
+            x0 = min(x0, k[0])
+            x1 = max(x1, k[0])
+            y0 = min(y0, k[1])
+            y1 = max(y1, k[1])
+            z0 = min(z0, k[2])
+            z1 = max(z1, k[2])
+        return ((x0,y0,z0),(x1,y1,z1))
+
+    def get_block_at(self, x, y, z):
+        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
+        return c.get_block_at(x%16, y%16, z%16)
+
+    def set_block_at(self, x, y, z, block):
+        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
+        c.set_block_at(x%16, y%16, z%16, block)
+
+
+class ChunkNotLoadedException(Exception):
+    def __str__(self):
+        pos = self.args[0]
+        return "Chunk at %d %d %d not loaded (yet?)"%(pos[0], pos[1], pos[2])
+
+
+class ChatManager:
+    def __init__(self, global_state):
+        self.g = global_state
+        self.handler = None
+
+        self.g.connection.register_packet_listener(self.print_chat, clientbound.play.ChatMessagePacket)
+
+    def translate_chat(self, data):
+        if isinstance(data, str):
+            return data
+        elif 'extra' in data:
+            return ''.join([self.translate_chat(x) for x in data['extra']])
+        elif 'text' in data:
+            return data['text']
+        elif 'translate' in data:
+            return data['translate']
+        else:
+            print(data)
+            return '?'
+
+    def print_chat(self, chat_packet):
+        try:
+            source = chat_packet.field_string('position')
+            text = self.translate_chat(json.loads(chat_packet.json_data))
+            print('[%s] %s'%(source, text))
+        except Exception as ex:
+            print('Exception %r on message (%s): %s' % (ex, chat_packet.field_string('position'), chat_packet.json_data))
+
+        if self.handler:
+            self.handler((source, text))
+
+    def set_handler(self, func):
+        self.handler = func
+
+    def send(self, text):
+        if not text:
+            # Prevents connection bug when sending empty chat message
+            return
+        packet = serverbound.play.ChatPacket()
+        packet.message = text
+        self.g.connection.write_packet(packet)

protocol/packets.py

@@ -6,7 +6,120 @@ from minecraft.networking.types import (
     multi_attribute_alias, Vector, UnsignedLong
 )
 
-from ....types.nbt import Nbt
+from protocol.types import Nbt
+from minecraft.networking.packets import Packet
+from minecraft.networking.types import (
+    VarInt, Integer, UnsignedByte, Position, Vector, MutableRecord,
+    attribute_alias, multi_attribute_alias, Long, Boolean, VarLong,
+)
+
+
+class BlockChangePacket(Packet):
+    id = 0x0B
+    packet_name = 'block change'
+    definition = [
+        {'location': Position},
+        {'block_state_id': VarInt}]
+    block_state_id = 0
+
+    # For protocols < 347: an accessor for (block_state_id >> 4).
+    @property
+    def blockId(self):
+        return self.block_state_id >> 4
+
+    @blockId.setter
+    def blockId(self, block_id):
+        self.block_state_id = (self.block_state_id & 0xF) | (block_id << 4)
+
+    # For protocols < 347: an accessor for (block_state_id & 0xF).
+    @property
+    def blockMeta(self):
+        return self.block_state_id & 0xF
+
+    @blockMeta.setter
+    def blockMeta(self, meta):
+        self.block_state_id = (self.block_state_id & ~0xF) | (meta & 0xF)
+
+    # This alias is retained for backward compatibility.
+    blockStateId = attribute_alias('block_state_id')
+
+
+class MultiBlockChangePacket(Packet):
+    id = 0x3B
+    packet_name = 'multi block change'
+
+    fields = 'chunk_x', 'chunk_z', 'records'
+
+    # Access the 'chunk_x' and 'chunk_z' fields as a tuple.
+    chunk_pos = multi_attribute_alias(tuple, 'chunk_x', 'chunk_z')
+
+    class Record(MutableRecord):
+        __slots__ = 'x', 'y', 'z', 'block_state_id', 'location'
+
+        def __init__(self, **kwds):
+            self.block_state_id = 0
+            super(MultiBlockChangePacket.Record, self).__init__(**kwds)
+
+        # Access the 'x', 'y', 'z' fields as a Vector of ints.
+        position = multi_attribute_alias(Vector, 'x', 'y', 'z')
+
+        # For protocols < 347: an accessor for (block_state_id >> 4).
+        @property
+        def blockId(self):
+            return self.block_state_id >> 4
+
+        @blockId.setter
+        def blockId(self, block_id):
+            self.block_state_id = self.block_state_id & 0xF | block_id << 4
+
+        # For protocols < 347: an accessor for (block_state_id & 0xF).
+        @property
+        def blockMeta(self):
+            return self.block_state_id & 0xF
+
+        @blockMeta.setter
+        def blockMeta(self, meta):
+            self.block_state_id = self.block_state_id & ~0xF | meta & 0xF
+
+        # This alias is retained for backward compatibility.
+        blockStateId = attribute_alias('block_state_id')
+
+        def read(self, file_object, parent):
+            data = VarLong.read(file_object)
+            self.block_state_id = int(data >> 12)
+            self.x = int(data >> 8 & 0xf)
+            self.z = int(data >> 4 & 0xf)
+            self.y = int(data & 0xf)
+            # Absolute position in world to be compatible with BlockChangePacket
+            self.location = Vector(self.position.x + parent.chunk_x*16, self.position.y, self.position.z + parent.chunk_z*16)
+
+        def write(self, packet_buffer):
+            raise
+            UnsignedByte.send(self.x << 4 | self.z & 0xF, packet_buffer)
+            UnsignedByte.send(self.y, packet_buffer)
+            VarInt.send(self.block_state_id, packet_buffer)
+
+    def read(self, file_object):
+        coords = Long.read(file_object)
+        self.chunk_x = int(coords >> 42 & 0x3fffff)
+        self.chunk_z = int(coords >> 20 & 0x3fffff)
+        self.chunk_y = int(coords & 0xfffff)
+        self.unknown = Boolean.read(file_object)
+        array_size = VarInt.read(file_object)
+        self.records = []
+        for i in range(array_size):
+            record = self.Record()
+            record.read(file_object, self)
+            self.records.append(record)
+
+    def write_fields(self, packet_buffer):
+        raise
+        Integer.send(self.chunk_x, packet_buffer)
+        Integer.send(self.chunk_z, packet_buffer)
+        VarInt.send(len(self.records), packet_buffer)
+        for record in self.records:
+            record.write(packet_buffer)
+
 
 class ChunkDataPacket(Packet):
     id = 0x20

protocol/types.py

@@ -1,16 +1,23 @@
-"""Contains definition for minecraft's NBT format.
-"""
 from __future__ import division
+
+from minecraft.networking.types.basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray
+
 import struct
 
 from minecraft.networking.types.utility import Vector
 from minecraft.networking.types.basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray
 
-from .basic import IntegerPrefixedByteArray
 
-__all__ = (
-    'Nbt',
-)
+class IntegerPrefixedByteArray(Type):
+    @staticmethod
+    def read(file_object):
+        length = Integer.read(file_object)
+        return struct.unpack(str(length) + "s", file_object.read(length))[0]
+
+    @staticmethod
+    def send(value, socket):
+        Integer.send(len(value), socket)
+        socket.send(value)
 
 TAG_End = 0
 TAG_Byte = 1
@@ -26,9 +33,7 @@ TAG_Compound = 10
 TAG_Int_Array = 11
 TAG_Long_Array = 12
 
-
 class Nbt(Type):
-
     @staticmethod
     def read(file_object):
         type_id = Byte.read(file_object)
@@ -91,5 +96,3 @@ class Nbt(Type):
     def send(value, socket):
         # TODO
         pass
-
-