Transport Layer:Transmission Control Protocol (TCP)
Application Layer:W3GS Messages (W3GS)
Message Id:0x3D
Message Name:W3GS_MAPCHECK
Direction:Server to Client
Used By:Warcraft III Reign of Chaos, Warcraft III The Frozen Throne
Message Format:
(does not include protocol header)
(UINT32) Unknown
(STRING) File Path
(UINT32) File size
(UINT32) Map info
(UINT32) File CRC encryption
(UINT32) File SHA-1 hash


This is sent from the game host to a client that just joined to check if the client has the map.

The map info is the actual CRC and the other CRC is actually an "xoro" value.



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