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cocdecoder.py
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cocdecoder.py
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from cocdp.cocutils import *
from cocdp.cocmessages import *
import codecs
"""
PacketDecoder can be used to print decoded messages: 'display'
or to decode and dispatch using 'processmessage'
"""
class empty:
pass
class PacketDecoder:
def decodesimple(self, data, name, decoder): # cap
if decoder:
f, o= unpackmessage(decoder, data)
print("%s: %s" % (name, f))
else:
o= 0
print("%s" % (name))
if o<len(data):
print("WARNING: rest: %s" % (codecs.encode(data[o:],"hex")))
def versioned(self, msg):
if type(msg)==str:
return msg
for k,v in list(msg.items()):
if self.versionmatch(k):
return v
print("TODO: scan version list %s in %s" % (self.version, msg))
def versionmatch(self, spec):
if spec==self.version:
return True
ix= spec.find("..")
if ix==0:
vermin= 0.0
vermax= float(spec[2:])
elif ix==len(spec)-2:
vermin= float(spec[:ix])
vermax= 99.999
else:
vermin= float(spec[:ix])
vermax= float(spec[ix+2:])
return vermin <= float(self.version) <= vermax
def processmessage(self, msgid, unk, data, delegate=None):
"""
the delegate object can be used to call specific handlers for messages, or commands.
"""
#print data.encode("hex")
msgname="?"
obj= None
o= 0
try:
if msgid in msgtypes:
msg= msgtypes[msgid]
msgname= msg["name"]
# format self delegate
# N N N -> print name + hex msg
# N N Y -> call delegate with pkt, None
# N Y N -> call self with pkt, None
# N Y Y -> first call self, then pass result to delegate
# Y N N -> simpledecode
# Y N Y -> simpledecode + pass result to delegate
# Y Y N -> simpledecode + pass result to self
# Y Y Y
if "format" in msg:
obj, o= unpackobject(self.versioned(msg["format"]), self.versioned(msg.get("fields", "")), data, o)
if hasattr(self, "decode_"+msg["name"]):
obj, o= getattr(self, "decode_"+msg["name"])(data, o, obj)
if delegate and hasattr(delegate, "handle_"+msg["name"]):
getattr(delegate, "handle_"+msg["name"])(data, obj)
if o==0 and len(data)>0:
print("TODO: %s(%d): %s" % (msg["name"], msgid, codecs.encode(data,"hex")))
elif o<len(data):
print("WARNING: unprocessed(%d): %s" % (msgid, codecs.encode(data[o:],"hex")))
if obj:
obj.__= msgname
else:
print("WARNING: unknown msg: %d: %s" % (msgid, codecs.encode(data,"hex")))
obj= None
except Exception as e:
print("ERROR: %s: in %s(%d) at offset %d in %s" % (e, msgname, msgid, o, codecs.encode(data,"hex")))
#raise
return obj, o
def display(self, msgid, obj):
if not msgid in msgtypes:
print("WARNING: Strange - unknown msgid(%d) in display" % (msgid))
return
msg= msgtypes[msgid]
if type(obj)==str:
obj, o= self.processmessage(msgid, 0, obj)
# todo: handle arrays
# todo: handle special values, like globalid's
# or named constants
if "display" in msg:
print("%s %s" % (msg["name"], msg["displayformat"] % getfields(obj, msg["display"])))
else:
dumpobj(obj)
def decode_AvailableServerCommand(self, data, o, obj):
if not obj: obj= empty()
obj.cmd, o= self.decode_Command(data, o)
return obj, o
def decode_Command(self, data, o):
hdr, o= unpackmessage("d", data, o)
cmdid,= hdr
if cmdid in cmdtypes:
cmd= cmdtypes[cmdid]
if "format" in cmd:
item, o= unpackobject(self.versioned(cmd["format"]), self.versioned(cmd.get("fields", "")), data, o)
else:
item= None
if hasattr(self, "decodecmd_"+cmd["name"]):
item, o= getattr(self, "decodecmd_"+cmd["name"])(data, o, item)
# if delegate and hasattr(delegate, "handlecmd_"+cmd["name"]):
# getattr(delegate, "handlecmd_"+cmd["name"])(data, item)
item.__= cmd["name"]
return item, o
else:
print("WARNING: unknown cmd: %d: %s" % (cmdid, codecs.encode(data[o:],"hex")))
return None, o
def decode_EndClientTurn(self, data, o, obj):
o=0
"""
hdr:
0: d time in 1/60 seconds since login
1: d checksum
2: d nr of actions
when hdr[1] has the wrong value, the server responds with a 'OutOfSync' message
containing the right value.
"""
ahdr, o= unpackmessage("ddd", data, o)
curtick, checksum, nractions= ahdr
obj= empty()
obj.curtick= curtick
obj.checksum= checksum
obj.cmds=[]
count= 0
while o<len(data) and count<nractions:
item, o= self.decode_Command(data, o)
if not item:
break
obj.cmds.append(item)
count += 1
if count!=nractions:
print("WARNING: Too few Actions(%d), expected(%d)" % (count, nractions))
return obj, o
def decode_AllianceStreamMessage(self, data, o):
hdr, o= unpackmessage("d", data, o)
stmid,= hdr
if stmid in lstmtypes:
stm= lstmtypes[stmid]
if "format" in stm:
#print "%d: %s %s" % (stmid, stm["format"], data[o:].encode("hex"))
item, o= unpackobject(self.versioned(stm["format"]), self.versioned(stm.get("fields", "")), data, o)
else:
item= None
if hasattr(self, "decodestm_"+stm["name"]):
item, o= getattr(self, "decodestm_"+stm["name"])(data, o, item)
# if delegate and hasattr(delegate, "handlestm_"+stm["name"]):
# getattr(delegate, "handlestm_"+stm["name"])(data, item)
item.__= stm["name"]
return item, o
else:
print("WARNING: unknown lstm: %d: %s" % (stmid, codecs.encode(data[o:],"hex")))
return None, o
def decode_AllianceStream(self, data, o, obj):
hdr, o= unpackmessage("d", data, o)
nrmsgs,= hdr
obj= empty()
obj.msgs=[]
count= 0
while o<len(data) and count<nrmsgs:
item, o= self.decode_AllianceStreamMessage(data, o)
if not item:
break
obj.msgs.append(item)
count += 1
if count!=nrmsgs:
print("WARNING: Too few Messages(%d), expected(%d)" % (count, nrmsgs))
return obj, o
def decode_AvatarStreamMessage(self, data, o):
hdr, o= unpackmessage("d", data, o)
stmid,= hdr
if stmid in vstmtypes:
stm= vstmtypes[stmid]
if "format" in stm:
#print "%d: %s %s" % (stmid, stm["format"], data[o:].encode("hex"))
item, o= unpackobject(self.versioned(stm["format"]), self.versioned(stm.get("fields", "")), data, o)
else:
item= None
if hasattr(self, "decodestm_"+stm["name"]):
item, o= getattr(self, "decodestm_"+stm["name"])(data, o, item)
# if delegate and hasattr(delegate, "handlestm_"+stm["name"]):
# getattr(delegate, "handlestm_"+stm["name"])(data, item)
item.__= stm["name"]
return item, o
else:
print("WARNING: unknown vstm: %d: %s" % (stmid, codecs.encode(data[o:],"hex")))
return None, o
def decode_AvatarStream(self, data, o, obj):
hdr, o= unpackmessage("d", data, o)
nrmsgs,= hdr
obj= empty()
obj.msgs=[]
count= 0
while o<len(data) and count<nrmsgs:
item, o= self.decode_AvatarStreamMessage(data, o)
if not item:
break
obj.msgs.append(item)
count += 1
if count!=nrmsgs:
print("WARNING: Too few Messages(%d), expected(%d)" % (count, nrmsgs))
return obj, o
def decodecmd_BuyResources(self, data, o, obj):
if not obj: obj= empty()
obj.cmd, o= self.decode_Command(data, o)
(obj.cmdtick,), o= unpackmessage("d", data, o)
return obj, o