add Block Change Packet (client bound)

minecraft/networking/packets.py

@@ -3,7 +3,7 @@ from zlib import compress
 
 from .types import (
     VarInt, Integer, Float, Double, UnsignedShort, Long, Byte, UnsignedByte,
-    String, VarIntPrefixedByteArray, Boolean, UUID, Short
+    String, VarIntPrefixedByteArray, Boolean, UUID, Short, UnsignedLong, Position
 )
 
 
@@ -1007,6 +1007,26 @@ class ClientSpawnObject(Packet):
     def write(self, socket, compression_threshold=None):
         raise NotImplementedError
 
+class ClientBlockChange(Packet):
+    @staticmethod
+    def get_id(context):
+        return 0x0B if context.protocol_version >= 332 else \
+               0x0C if context.protocol_version >= 318 else \
+               0x0B if context.protocol_version >= 67 else \
+               0x24 if context.protocol_version >= 62 else \
+               0x23
+
+    packet_name = 'block change'
+
+    def read(self, file_object):
+        self.location = Position.read(file_object)
+        blockData = VarInt.read(file_object)
+        self.blockId = (blockData >> 4)
+        self.blockMeta = (blockData & 0xF)
+
+    def write(self, socket, compression_threshold=None):
+        raise NotImplementedError
+
 def state_playing_clientbound(context):
     packets = {
         KeepAlivePacketClientbound,
@@ -1022,6 +1042,7 @@ def state_playing_clientbound(context):
         ClientCombatEvent,
         ClientExplosion,
         ClientSpawnObject,
+        ClientBlockChange,
     }
     if context.protocol_version <= 47:
         packets |= {

minecraft/networking/types.py

@@ -147,6 +147,14 @@ class Long(Type):
     def send(value, socket):
         socket.send(struct.pack('>q', value))
 
+class UnsignedLong(Type):
+    @staticmethod
+    def read(file_object):
+        return struct.unpack('>Q', file_object.read(8))[0]
+
+    @staticmethod
+    def send(value, socket):
+        socket.send(struct.pack('>Q', value))
 
 class Float(Type):
     @staticmethod
@@ -213,3 +221,31 @@ class UUID(Type):
     @staticmethod
     def send(value, socket):
         socket.send(uuid.UUID(value).bytes)
+
+class Position(Type):
+    @staticmethod
+    def read(file_object):
+        location = UnsignedLong.read(file_object) # 64-bit value
+        x = int(location >> 38)             # 26 MSBs
+        y = int((location >> 26) & 0xFFF)   # 12 bits between them
+        z = int(location & 0x3FFFFFF)       # 26 LSBs
+
+        if x >= pow(2,25):
+            x -= pow(2,26)
+
+        if y >= pow(2,11):
+            y -= pow(2,12)
+
+        if z >= pow(2,25):
+            z -= pow(2,26)
+
+        return {'x': x, 'y': y, 'z': z}
+
+    @staticmethod
+    def send(value, socket):
+        # Position is a single encoded long value; use encode method to encode position properly
+        UnsignedLong.send(value, socket)
+
+    @staticmethod
+    def encode(x,y,z):
+        return ((x & 0x3FFFFFF) << 38) | ((y & 0xFFF) << 26) | (z & 0x3FFFFFF)