Useful Stuff

[x1nixmzeng]

Managed to scrape this from my browser cache - the last 24 hours wasn't the best time to post stuff

What's this section for? Sharing useful information on GunZ 2!!


Packets

struct pktHead
{
        unsigned char type;

        unsigned short size;
        unsigned short checksum;

        unsigned int unknown1;

        unsigned short packetid;

        unsigned int unknown2;
}

packet types:

const unsigned char PACKET_STANDARD  = 0xB;
const unsigned char PACKET_HANDSHAKE = 0xC;

/*

  showing how similar the key is to gunz 1
  it seems only bytes 0x?? change with a new handshake

  other bytes (02 00 00 00 03) seem to be used in encryption - please help on that :)

unsigned char cryptHash[] = {
    0x57, 0x02, 0x5B, 0x04,    0x??, 0x??, 0x01, 0x08,
    //                           xx    xx

    0x37, 0x0A, 0x12, 0x69,    0x41, 0x38, 0x0F, 0x78,
    //
    0x1B, 0x04, 0x24, 0x22,    0x43, 0x01, 0x49, 0x53,
    //            5d    2e             3a            
    0x50, 0x05, 0x13, 0x35,    0x4F, 0x02, 0x4D, 0x05,    0x02, 0x00, 0x00, 0x00, 0x03
    //                  c9       28    a4  
};

*/


void encPacket( unsigned char *pkt, unsigned int len )
{
        unsigned int EDX;

        for(unsigned int i = 0; i < len; i++)
        {
                EDX = pkt[i] ^ cryptHash[ i % 20 ];

                // 0x20 may refer to the DWORD at the end of the cryptHash
                EDX = (unsigned short)( EDX << cryptHash[ 0x20 ] );

                EDX |= (EDX >> 8);

                EDX ^= 0xF0;


                pkt[i] = (unsigned char)EDX; // dl!
        }

}



void decPacket( unsigned char *pkt, unsigned int len )
{
        unsigned int EAX, EBX;

        // i = edx
        // len = eax

        for(unsigned int i = 0; i < len; i++)
        {
                EAX = pkt[i] ^ 0xF0;

                EBX = EAX;
                EBX &= 0x03; // end of cryptHash structure thing


                // Again, no idea where the 0x2 comes into it
                EBX <<= (8 - 0x02);


                EBX |= (EAX >> cryptHash[0x20]);

                EBX ^= cryptHash[ i % 0x20 ];

                pkt[i] = (unsigned char)EBX;
        }
}




unsigned short makeChecksum(unsigned char *pkt, unsigned int len)
{
        unsigned int chksm = 0;

        if( len > 0xF )
        {
                for(unsigned int i = 0xF; i < len; i++)
                {
                        chksm += pkt[i];
                }
        }

        chksm -= (pkt[0] + len);
        
        chksm += (chksm >> 0x10);

        return (unsigned short)chksm;
}

Models
Had a look at the new RaiderZ section yet? I started sharing some code for reading the newest ELU format: http://forum.ragezone.com/f697/model-formats-761223/

Also, check out Phantom*'s Blender WIP: http://forum.ragezone.com/f700/help-bad-number-version-759203/index2.html#post6445022


Maps

Managed to launch the client yet? Me neither.. but I did managed to read some geometry from the new ship map (test_cargo_ship_01.elu):

 

[wesman2232]

Very nice, I like the geometry on that map. That looks sexy :3
Good luck on this.