/
DataTypes.py
248 lines (212 loc) · 6.57 KB
/
DataTypes.py
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#
# Copyright 2014 Epsilon232 <2014ryan@student.ncc.vic.edu.au>
#
# Dennis is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import struct
import Misc
import zlib
import math
import traceback;
from Location import Location
compress = False
class Buffer():
def __init__(self):
self.string = ""
def read(self, count):
if count > len(self.string):
raise Exception("Reading " + str(count) + ", buffer contains " + str(len(self.string)))
string = self.string[:count]
self.string = self.string[count:]
return string
def readBuffer(self, count, source=None):
buffer = Buffer()
if source == None:
buffer.addRaw(self.read(count))
else:
buffer.addRaw(source.recv(count));
return buffer
def addRaw(self, string):
if string != None:
self.string += string
def getRaw(self):
return self.string
def getNextPacket(self, compression=-1, source=None):
if self.string == "" and source == None:
return None;
tmp = self.string;
length = self.readVarInt(source);
if source != None or length > 0:
packet = self.readBuffer(length, source);
if compression == -1:
return packet;
uncompressedSize = packet.readVarInt();
if uncompressedSize >= compression:
packet.string = zlib.decompress(packet.string);
return packet;
else:
self.string = tmp
#print("no source");
return None;
def readObjectData(self):
objectData = {}
objectData["id"] = self.readInt()
if objectData["id"] == 0: return None
objectData["speedX"] = self.readShort()
objectData["speedY"] = self.readShort()
objectData["speedZ"] = self.readShort()
return objectData
def readSlot(self):
slot = Misc.Slot()
slot.dataValue = self.readShort()
if slot.dataValue == -1: return None
slot.count = self.readByte()
slot.damage = self.readShort()
nbtSize = self.readByte()
if nbtSize == 0: return slot
slot.nbt = self.read(nbtSize)
return slot
def readMetadata(self):
metadata = {}
key = self.readUnsignedByte()
while key != 0x7f:
index = key & 0x1f
dataType = key >> 5
if (dataType == 0): metadata[index]= self.readByte()
elif (dataType == 1): metadata[index] = self.readShort()
elif (dataType == 2): metadata[index] = self.readInt()
elif (dataType == 3): metadata[index] = self.readFloat()
elif (dataType == 4): metadata[index] = self.readString()
elif (dataType == 5): metadata[index] = self.readSlot()
elif (dataType == 6): metadata[index] = (self.readInt(), self.readInt(), self.readInt())
elif (dataType == 7): metadata[index] = (self.readFloat(), self.readFloat(), self.readFloat())
else: raise Exception("Unknown enitiy metadata type.")
key = self.readUnsignedByte()
return metadata
def readVarInt(self, source=None):
tmp = self.string
#try:
number = 0
reference = 0
byte = self.readUnsignedByte(source)
number += byte & 0x7f
while byte >> 7 == 1 and reference < 4:
reference += 1
byte = self.readUnsignedByte(source)
number += (byte & 0x7f) << (7 * reference)
return number
#except TypeError:
# self.string = tmp
# return None
def readVarIntandSize(self):
number = 0
reference = 0
byte = self.readUnsignedByte()
number += byte & 0x7f
while(byte >> 7 == 1):
reference += 1
byte = self.readUnsignedByte()
number += (byte & 0x7f) << (7 * reference)
return number, reference + 1
def readPosition(self):
val = self.readLong()
x = (val >> 38) & 0x3FFFFFF
y = (val >> 26) & 0xFFF
z = val & 0x3FFFFFF;
location = Location();
location.set(x, y, z);
return location;
def readString(self):
length = self.readVarInt()
return self.read(length)
def readShort(self):
return struct.unpack("!h", self.read(2))[0]
def readInt(self):
return struct.unpack("!i", self.read(4))[0]
def readLong(self):
return struct.unpack("!q", self.read(8))[0]
def readBool(self):
return struct.unpack("!?", self.read(1))[0]
def readFloat(self):
return struct.unpack("!f", self.read(4))[0]
def readDouble(self):
return struct.unpack("!d", self.read(8))[0]
def readByte(self):
return struct.unpack("!b", self.read(1))[0]
def readUnsignedByte(self, source=None):
if source == None:
return struct.unpack("!B", self.read(1))[0];
else:
data = source.recv(1);
return struct.unpack("!B", data)[0];
def writeSlot(self, slot):
print "data value", slot.dataValue
if slot == None:
self.writeShort(-1);
return;
self.writeShort(slot.dataValue);
self.writeByte(slot.count);
self.writeShort(slot.damage);
if slot.nbt == "":
self.writeShort(-1);
return;
self.writeShort(len(slot.nbt))
self.writeInt(slot.nbt);
def writeDouble(self, number):
self.string += struct.pack("!d", number);
def writeBool(self, number):
self.string += struct.pack("!?", number)
def writeFloat(self, number):
self.string += struct.pack("!f", number)
def writeVarInt(self, number):
string = ""
char = number & 0x7f
number = number >> 7
while(number != 0):
char = char | 0x80
string += chr(char)
char = number & 0x7f
number = number >> 7
string += chr(char)
self.string += string
def writeInt(self, number):
self.string += struct.pack("!i", number)
def writeString(self, string):
self.writeVarInt(len(string));
self.string += struct.pack("!" + str(len(string)) + "s", string);
def writeByte(self, number):
self.string += chr(number)
def writeUnsignedByte(self, number):
self.string += struct.pack("!B", number)
def writeShort(self, number):
self.string += struct.pack("!h", number)
def writeUnsignedShort(self, number):
self.string += struct.pack("!H", number)
def networkFormat(self, compressionThreshold=-1):
string = self.string;
self.string = "";
if compressionThreshold != -1:
if len(string) >= compressionThreshold:
afterSize = len(string)
string = zlib.compress(string)
beforeSize = len(string) + math.floor(math.log(afterSize, 128)) + 1
else:
afterSize = 0
beforeSize = len(string) + 1
self.writeVarInt(beforeSize)
self.writeVarInt(afterSize)
self.addRaw(string)
else:
self.writeVarInt(len(string));
self.addRaw(string);