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protocol18092.py
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# Copyright (c) 2013 Blizzard Entertainment
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from decoders import *
# Decoding instructions for each protocol type.
typeinfos = [
('_int',[(0,7)]), #0
('_int',[(0,4)]), #1
('_int',[(0,6)]), #2
('_int',[(0,14)]), #3
('_int',[(0,22)]), #4
('_int',[(0,32)]), #5
('_choice',[(0,2),{0:('m_uint6',2),1:('m_uint14',3),2:('m_uint22',4),3:('m_uint32',5)}]), #6
('_int',[(0,5)]), #7
('_struct',[[('m_playerId',7,-1)]]), #8
('_blob',[(0,8)]), #9
('_int',[(0,8)]), #10
('_struct',[[('m_flags',10,0),('m_major',10,1),('m_minor',10,2),('m_revision',10,3),('m_build',5,4),('m_baseBuild',5,5)]]), #11
('_int',[(0,3)]), #12
('_struct',[[('m_signature',9,0),('m_version',11,1),('m_type',12,2),('m_elapsedGameLoops',5,3)]]), #13
('_fourcc',[]), #14
('_blob',[(0,7)]), #15
('_int',[(0,64)]), #16
('_struct',[[('m_region',10,0),('m_programId',14,1),('m_realm',5,2),('m_name',15,3),('m_id',16,4)]]), #17
('_struct',[[('m_a',10,0),('m_r',10,1),('m_g',10,2),('m_b',10,3)]]), #18
('_int',[(0,2)]), #19
('_struct',[[('m_name',9,0),('m_toon',17,1),('m_race',9,2),('m_color',18,3),('m_control',10,4),('m_teamId',1,5),('m_handicap',0,6),('m_observe',19,7),('m_result',19,8)]]), #20
('_array',[(0,5),20]), #21
('_optional',[21]), #22
('_blob',[(0,10)]), #23
('_blob',[(0,11)]), #24
('_struct',[[('m_file',24,0)]]), #25
('_bool',[]), #26
('_int',[(-9223372036854775808,64)]), #27
('_blob',[(0,12)]), #28
('_blob',[(40,0)]), #29
('_array',[(0,4),29]), #30
('_optional',[30]), #31
('_struct',[[('m_playerList',22,0),('m_title',23,1),('m_difficulty',9,2),('m_thumbnail',25,3),('m_isBlizzardMap',26,4),('m_timeUTC',27,5),('m_timeLocalOffset',27,6),('m_description',28,7),('m_imageFilePath',24,8),('m_mapFileName',24,9),('m_cacheHandles',31,10),('m_miniSave',26,11),('m_gameSpeed',12,12),('m_defaultDifficulty',2,13)]]), #32
('_optional',[10]), #33
('_struct',[[('m_race',33,-1)]]), #34
('_struct',[[('m_team',33,-1)]]), #35
('_struct',[[('m_name',9,-7),('m_randomSeed',5,-6),('m_racePreference',34,-5),('m_teamPreference',35,-4),('m_testMap',26,-3),('m_testAuto',26,-2),('m_observe',19,-1)]]), #36
('_array',[(0,5),36]), #37
('_struct',[[('m_lockTeams',26,-11),('m_teamsTogether',26,-10),('m_advancedSharedControl',26,-9),('m_randomRaces',26,-8),('m_battleNet',26,-7),('m_amm',26,-6),('m_ranked',26,-5),('m_noVictoryOrDefeat',26,-4),('m_fog',19,-3),('m_observers',19,-2),('m_userDifficulty',19,-1)]]), #38
('_int',[(1,4)]), #39
('_int',[(1,8)]), #40
('_bitarray',[(0,6)]), #41
('_bitarray',[(0,8)]), #42
('_bitarray',[(0,2)]), #43
('_struct',[[('m_allowedColors',41,-5),('m_allowedRaces',42,-4),('m_allowedDifficulty',41,-3),('m_allowedControls',42,-2),('m_allowedObserveTypes',43,-1)]]), #44
('_array',[(0,5),44]), #45
('_struct',[[('m_randomValue',5,-23),('m_gameCacheName',23,-22),('m_gameOptions',38,-21),('m_gameSpeed',12,-20),('m_gameType',12,-19),('m_maxUsers',7,-18),('m_maxObservers',7,-17),('m_maxPlayers',7,-16),('m_maxTeams',39,-15),('m_maxColors',2,-14),('m_maxRaces',40,-13),('m_maxControls',40,-12),('m_mapSizeX',10,-11),('m_mapSizeY',10,-10),('m_mapFileSyncChecksum',5,-9),('m_mapFileName',24,-8),('m_mapAuthorName',9,-7),('m_modFileSyncChecksum',5,-6),('m_slotDescriptions',45,-5),('m_defaultDifficulty',2,-4),('m_cacheHandles',30,-3),('m_isBlizzardMap',26,-2),('m_isPremadeFFA',26,-1)]]), #46
('_optional',[1]), #47
('_optional',[7]), #48
('_struct',[[('m_color',48,-1)]]), #49
('_array',[(0,5),5]), #50
('_struct',[[('m_control',10,-10),('m_userId',47,-9),('m_teamId',1,-8),('m_colorPref',49,-7),('m_racePref',34,-6),('m_difficulty',2,-5),('m_handicap',0,-4),('m_observe',19,-3),('m_rewards',50,-2),('m_toonHandle',15,-1)]]), #51
('_array',[(0,5),51]), #52
('_struct',[[('m_phase',12,-9),('m_maxUsers',7,-8),('m_maxObservers',7,-7),('m_slots',52,-6),('m_randomSeed',5,-5),('m_hostUserId',47,-4),('m_isSinglePlayer',26,-3),('m_gameDuration',5,-2),('m_defaultDifficulty',2,-1)]]), #53
('_struct',[[('m_userInitialData',37,-3),('m_gameDescription',46,-2),('m_lobbyState',53,-1)]]), #54
('_struct',[[('m_syncLobbyState',54,-1)]]), #55
('_struct',[[('m_name',15,-1)]]), #56
('_blob',[(0,6)]), #57
('_struct',[[('m_name',57,-1)]]), #58
('_struct',[[('m_name',57,-3),('m_type',5,-2),('m_data',15,-1)]]), #59
('_struct',[[('m_type',5,-3),('m_name',57,-2),('m_data',28,-1)]]), #60
('_array',[(0,5),10]), #61
('_struct',[[('m_signature',61,-1)]]), #62
('_struct',[[('m_developmentCheatsEnabled',26,-4),('m_multiplayerCheatsEnabled',26,-3),('m_syncChecksummingEnabled',26,-2),('m_isMapToMapTransition',26,-1)]]), #63
('_struct',[[]]), #64
('_struct',[[('m_fileName',24,-5),('m_automatic',26,-4),('m_overwrite',26,-3),('m_name',9,-2),('m_description',23,-1)]]), #65
('_int',[(-2147483648,32)]), #66
('_struct',[[('x',66,-2),('y',66,-1)]]), #67
('_struct',[[('m_point',67,-4),('m_time',66,-3),('m_verb',23,-2),('m_arguments',23,-1)]]), #68
('_struct',[[('m_data',68,-1)]]), #69
('_int',[(0,17)]), #70
('_int',[(0,16)]), #71
('_struct',[[('m_abilLink',71,-3),('m_abilCmdIndex',7,-2),('m_abilCmdData',33,-1)]]), #72
('_optional',[72]), #73
('_null',[]), #74
('_int',[(0,20)]), #75
('_struct',[[('x',75,-3),('y',75,-2),('z',66,-1)]]), #76
('_struct',[[('m_targetUnitFlags',10,-6),('m_timer',10,-5),('m_tag',5,-4),('m_snapshotUnitLink',71,-3),('m_snapshotPlayerId',47,-2),('m_snapshotPoint',76,-1)]]), #77
('_choice',[(0,2),{0:('None',74),1:('TargetPoint',76),2:('TargetUnit',77),3:('Data',5)}]), #78
('_optional',[5]), #79
('_struct',[[('m_cmdFlags',70,-4),('m_abil',73,-3),('m_data',78,-2),('m_otherUnit',79,-1)]]), #80
('_array',[(0,8),10]), #81
('_choice',[(0,2),{0:('None',74),1:('Mask',42),2:('OneIndices',81),3:('ZeroIndices',81)}]), #82
('_struct',[[('m_unitLink',71,-3),('m_intraSubgroupPriority',10,-2),('m_count',10,-1)]]), #83
('_array',[(0,8),83]), #84
('_array',[(0,8),5]), #85
('_struct',[[('m_subgroupIndex',10,-4),('m_removeMask',82,-3),('m_addSubgroups',84,-2),('m_addUnitTags',85,-1)]]), #86
('_struct',[[('m_controlGroupId',1,-2),('m_delta',86,-1)]]), #87
('_struct',[[('m_controlGroupIndex',1,-3),('m_controlGroupUpdate',19,-2),('m_mask',82,-1)]]), #88
('_struct',[[('m_count',10,-6),('m_subgroupCount',10,-5),('m_activeSubgroupIndex',10,-4),('m_unitTagsChecksum',5,-3),('m_subgroupIndicesChecksum',5,-2),('m_subgroupsChecksum',5,-1)]]), #89
('_struct',[[('m_controlGroupId',1,-2),('m_selectionSyncData',89,-1)]]), #90
('_array',[(0,3),66]), #91
('_struct',[[('m_recipientId',1,-2),('m_resources',91,-1)]]), #92
('_struct',[[('m_chatMessage',23,-1)]]), #93
('_int',[(-128,8)]), #94
('_struct',[[('x',66,-3),('y',66,-2),('z',66,-1)]]), #95
('_struct',[[('m_beacon',94,-7),('m_ally',94,-6),('m_autocast',94,-5),('m_targetUnitTag',5,-4),('m_targetUnitSnapshotUnitLink',71,-3),('m_targetUnitSnapshotPlayerId',47,-2),('m_targetPoint',95,-1)]]), #96
('_struct',[[('m_speed',12,-1)]]), #97
('_struct',[[('m_delta',94,-1)]]), #98
('_struct',[[('m_verb',23,-2),('m_arguments',23,-1)]]), #99
('_struct',[[('m_alliance',5,-2),('m_control',5,-1)]]), #100
('_struct',[[('m_unitTag',5,-1)]]), #101
('_struct',[[('m_unitTag',5,-2),('m_flags',10,-1)]]), #102
('_struct',[[('m_conversationId',66,-2),('m_replyId',66,-1)]]), #103
('_struct',[[('m_purchaseItemId',66,-1)]]), #104
('_struct',[[('m_difficultyLevel',66,-1)]]), #105
('_choice',[(0,3),{0:('None',74),1:('Checked',26),2:('ValueChanged',5),3:('SelectionChanged',66),4:('TextChanged',24)}]), #106
('_struct',[[('m_controlId',66,-3),('m_eventType',66,-2),('m_eventData',106,-1)]]), #107
('_struct',[[('m_soundHash',5,-2),('m_length',5,-1)]]), #108
('_struct',[[('m_soundHash',85,-2),('m_length',85,-1)]]), #109
('_struct',[[('m_syncInfo',109,-1)]]), #110
('_struct',[[('m_sound',5,-1)]]), #111
('_struct',[[('m_transmissionId',66,-1)]]), #112
('_struct',[[('x',71,-2),('y',71,-1)]]), #113
('_optional',[71]), #114
('_struct',[[('m_target',113,-4),('m_distance',114,-3),('m_pitch',114,-2),('m_yaw',114,-1)]]), #115
('_int',[(0,1)]), #116
('_struct',[[('m_skipType',116,-1)]]), #117
('_int',[(0,11)]), #118
('_struct',[[('x',118,-2),('y',118,-1)]]), #119
('_struct',[[('m_button',5,-4),('m_down',26,-3),('m_posUI',119,-2),('m_posWorld',76,-1)]]), #120
('_struct',[[('m_posUI',119,-2),('m_posWorld',76,-1)]]), #121
('_struct',[[('m_soundtrack',5,-1)]]), #122
('_struct',[[('m_planetId',66,-1)]]), #123
('_struct',[[('m_key',94,-2),('m_flags',94,-1)]]), #124
('_struct',[[('m_resources',91,-1)]]), #125
('_struct',[[('m_fulfillRequestId',66,-1)]]), #126
('_struct',[[('m_cancelRequestId',66,-1)]]), #127
('_struct',[[('m_researchItemId',66,-1)]]), #128
('_struct',[[('m_laggingPlayerId',1,-1)]]), #129
('_struct',[[('m_mercenaryId',66,-1)]]), #130
('_struct',[[('m_battleReportId',66,-2),('m_difficultyLevel',66,-1)]]), #131
('_struct',[[('m_battleReportId',66,-1)]]), #132
('_int',[(0,19)]), #133
('_struct',[[('m_decrementMs',133,-1)]]), #134
('_struct',[[('m_portraitId',66,-1)]]), #135
('_struct',[[('m_functionName',15,-1)]]), #136
('_struct',[[('m_result',66,-1)]]), #137
('_struct',[[('m_gameMenuItemIndex',66,-1)]]), #138
('_struct',[[('m_reason',94,-1)]]), #139
('_struct',[[('m_purchaseCategoryId',66,-1)]]), #140
('_struct',[[('m_button',71,-1)]]), #141
('_struct',[[('m_recipient',19,-2),('m_string',24,-1)]]), #142
('_struct',[[('m_recipient',19,-2),('m_point',67,-1)]]), #143
('_struct',[[('m_progress',66,-1)]]), #144
]
# Map from protocol NNet.Game.*Event eventid to (typeid, name)
game_event_types = {
5: (64, 'NNet.Game.SUserFinishedLoadingSyncEvent'),
7: (56, 'NNet.Game.SBankFileEvent'),
8: (58, 'NNet.Game.SBankSectionEvent'),
9: (59, 'NNet.Game.SBankKeyEvent'),
10: (60, 'NNet.Game.SBankValueEvent'),
11: (62, 'NNet.Game.SBankSignatureEvent'),
12: (63, 'NNet.Game.SUserOptionsEvent'),
22: (65, 'NNet.Game.SSaveGameEvent'),
23: (64, 'NNet.Game.SSaveGameDoneEvent'),
25: (64, 'NNet.Game.SPlayerLeaveEvent'),
26: (69, 'NNet.Game.SGameCheatEvent'),
27: (80, 'NNet.Game.SCmdEvent'),
28: (87, 'NNet.Game.SSelectionDeltaEvent'),
29: (88, 'NNet.Game.SControlGroupUpdateEvent'),
30: (90, 'NNet.Game.SSelectionSyncCheckEvent'),
31: (92, 'NNet.Game.SResourceTradeEvent'),
32: (93, 'NNet.Game.STriggerChatMessageEvent'),
33: (96, 'NNet.Game.SAICommunicateEvent'),
34: (97, 'NNet.Game.SSetAbsoluteGameSpeedEvent'),
35: (98, 'NNet.Game.SAddAbsoluteGameSpeedEvent'),
37: (99, 'NNet.Game.SBroadcastCheatEvent'),
38: (100, 'NNet.Game.SAllianceEvent'),
39: (101, 'NNet.Game.SUnitClickEvent'),
40: (102, 'NNet.Game.SUnitHighlightEvent'),
41: (103, 'NNet.Game.STriggerReplySelectedEvent'),
44: (64, 'NNet.Game.STriggerSkippedEvent'),
45: (108, 'NNet.Game.STriggerSoundLengthQueryEvent'),
46: (111, 'NNet.Game.STriggerSoundOffsetEvent'),
47: (112, 'NNet.Game.STriggerTransmissionOffsetEvent'),
48: (112, 'NNet.Game.STriggerTransmissionCompleteEvent'),
49: (115, 'NNet.Game.SCameraUpdateEvent'),
50: (64, 'NNet.Game.STriggerAbortMissionEvent'),
51: (104, 'NNet.Game.STriggerPurchaseMadeEvent'),
52: (64, 'NNet.Game.STriggerPurchaseExitEvent'),
53: (105, 'NNet.Game.STriggerPlanetMissionLaunchedEvent'),
54: (64, 'NNet.Game.STriggerPlanetPanelCanceledEvent'),
55: (107, 'NNet.Game.STriggerDialogControlEvent'),
56: (110, 'NNet.Game.STriggerSoundLengthSyncEvent'),
57: (117, 'NNet.Game.STriggerConversationSkippedEvent'),
58: (120, 'NNet.Game.STriggerMouseClickedEvent'),
59: (121, 'NNet.Game.STriggerMouseMovedEvent'),
63: (64, 'NNet.Game.STriggerPlanetPanelReplayEvent'),
64: (122, 'NNet.Game.STriggerSoundtrackDoneEvent'),
65: (123, 'NNet.Game.STriggerPlanetMissionSelectedEvent'),
66: (124, 'NNet.Game.STriggerKeyPressedEvent'),
67: (136, 'NNet.Game.STriggerMovieFunctionEvent'),
68: (64, 'NNet.Game.STriggerPlanetPanelBirthCompleteEvent'),
69: (64, 'NNet.Game.STriggerPlanetPanelDeathCompleteEvent'),
70: (125, 'NNet.Game.SResourceRequestEvent'),
71: (126, 'NNet.Game.SResourceRequestFulfillEvent'),
72: (127, 'NNet.Game.SResourceRequestCancelEvent'),
73: (64, 'NNet.Game.STriggerResearchPanelExitEvent'),
74: (64, 'NNet.Game.STriggerResearchPanelPurchaseEvent'),
75: (128, 'NNet.Game.STriggerResearchPanelSelectionChangedEvent'),
76: (129, 'NNet.Game.SLagMessageEvent'),
77: (64, 'NNet.Game.STriggerMercenaryPanelExitEvent'),
78: (64, 'NNet.Game.STriggerMercenaryPanelPurchaseEvent'),
79: (130, 'NNet.Game.STriggerMercenaryPanelSelectionChangedEvent'),
80: (64, 'NNet.Game.STriggerVictoryPanelExitEvent'),
81: (64, 'NNet.Game.STriggerBattleReportPanelExitEvent'),
82: (131, 'NNet.Game.STriggerBattleReportPanelPlayMissionEvent'),
83: (132, 'NNet.Game.STriggerBattleReportPanelPlaySceneEvent'),
84: (132, 'NNet.Game.STriggerBattleReportPanelSelectionChangedEvent'),
85: (105, 'NNet.Game.STriggerVictoryPanelPlayMissionAgainEvent'),
86: (64, 'NNet.Game.STriggerMovieStartedEvent'),
87: (64, 'NNet.Game.STriggerMovieFinishedEvent'),
88: (134, 'NNet.Game.SDecrementGameTimeRemainingEvent'),
89: (135, 'NNet.Game.STriggerPortraitLoadedEvent'),
90: (137, 'NNet.Game.STriggerCustomDialogDismissedEvent'),
91: (138, 'NNet.Game.STriggerGameMenuItemSelectedEvent'),
92: (139, 'NNet.Game.STriggerCameraMoveEvent'),
93: (104, 'NNet.Game.STriggerPurchasePanelSelectedPurchaseItemChangedEvent'),
94: (140, 'NNet.Game.STriggerPurchasePanelSelectedPurchaseCategoryChangedEvent'),
95: (141, 'NNet.Game.STriggerButtonPressedEvent'),
96: (64, 'NNet.Game.STriggerGameCreditsFinishedEvent'),
}
# The typeid of the NNet.Game.EEventId enum.
game_eventid_typeid = 0
# Map from protocol NNet.Game.*Message eventid to (typeid, name)
message_event_types = {
0: (142, 'NNet.Game.SChatMessage'),
1: (143, 'NNet.Game.SPingMessage'),
2: (144, 'NNet.Game.SLoadingProgressMessage'),
3: (64, 'NNet.Game.SServerPingMessage'),
}
# The typeid of the NNet.Game.EMessageId enum.
message_eventid_typeid = 1
# The typeid of NNet.SVarUint32 (the type used to encode gameloop deltas).
svaruint32_typeid = 6
# The typeid of NNet.Replay.SPlayerId (the type used to encode player ids).
replay_playerid_typeid = 8
# The typeid of NNet.Replay.SHeader (the type used to store replay game version and length).
replay_header_typeid = 13
# The typeid of NNet.Game.SDetails (the type used to store overall replay details).
game_details_typeid = 32
# The typeid of NNet.Replay.SInitData (the type used to store the inital lobby).
replay_initdata_typeid = 55
def _varuint32_value(value):
# Returns the numeric value from a SVarUint32 instance.
for k,v in value.iteritems():
return v
return 0
def _decode_event_stream(decoder, eventid_typeid, event_types, decode_player_id):
# Decodes events prefixed with a gameloop and possibly userid
gameloop = 0
while not decoder.done():
start_bits = decoder.used_bits()
# decode the gameloop delta before each event
delta = _varuint32_value(decoder.instance(svaruint32_typeid))
gameloop += delta
# decode the userid before each event
if decode_player_id:
playerid = decoder.instance(replay_playerid_typeid)
# decode the event id
eventid = decoder.instance(eventid_typeid)
typeid, typename = event_types.get(eventid, (None, None))
if typeid is None:
raise CorruptedError('eventid(%d) at %s' % (eventid, decoder))
# decode the event struct instance
event = decoder.instance(typeid)
event['_event'] = typename
event['_eventid'] = eventid
# insert gameloop and userid
event['_gameloop'] = gameloop
if decode_player_id:
event['_playerid'] = playerid
# the next event is byte aligned
decoder.byte_align()
# insert bits used in stream
event['_bits'] = decoder.used_bits() - start_bits
yield event
def decode_replay_game_events(contents):
"""Decodes and yields each game event from the contents byte string."""
decoder = BitPackedDecoder(contents, typeinfos)
for event in _decode_event_stream(decoder,
game_eventid_typeid,
game_event_types,
decode_player_id=True):
yield event
def decode_replay_message_events(contents):
"""Decodes and yields each message event from the contents byte string."""
decoder = BitPackedDecoder(contents, typeinfos)
for event in _decode_event_stream(decoder,
message_eventid_typeid,
message_event_types,
decode_player_id=True):
yield event
def decode_replay_header(contents):
"""Decodes and return the replay header from the contents byte string."""
decoder = VersionedDecoder(contents, typeinfos)
return decoder.instance(replay_header_typeid)
def decode_replay_details(contents):
"""Decodes and returns the game details from the contents byte string."""
decoder = VersionedDecoder(contents, typeinfos)
return decoder.instance(game_details_typeid)
def decode_replay_initdata(contents):
"""Decodes and return the replay init data from the contents byte string."""
decoder = BitPackedDecoder(contents, typeinfos)
return decoder.instance(replay_initdata_typeid)
def decode_replay_attributes_events(contents):
"""Decodes and yields each attribute from the contents byte string."""
buffer = BitPackedBuffer(contents, 'little')
attributes = {}
if not buffer.done():
attributes['source'] = buffer.read_bits(8)
attributes['mapNamespace'] = buffer.read_bits(32)
count = buffer.read_bits(32)
attributes['scopes'] = {}
while not buffer.done():
value = {}
value['namespace'] = buffer.read_bits(32)
value['attrid'] = attrid = buffer.read_bits(32)
scope = buffer.read_bits(8)
value['value'] = buffer.read_aligned_bytes(4)[::-1].strip('\x00')
if not scope in attributes['scopes']:
attributes['scopes'][scope] = {}
if not attrid in attributes['scopes'][scope]:
attributes['scopes'][scope][attrid] = []
attributes['scopes'][scope][attrid].append(value)
return attributes
def unit_tag(unitTagIndex, unitTagRecycle):
return (unitTagIndex << 18) + unitTagRecycle
def unit_tag_index(unitTag):
return (unitTag >> 18) & 0x00003fff
def unit_tag_recycle(unitTag):
return (unitTag) & 0x0003ffff