mangler.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program 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/>.
*/
 
#ifndef __MANGLER_H__
#define __MANGLER_H__
 
// Packet should consist of a GlobalHeaderType followed by a GlobalPacketType with the fields set as
// indicated.
 
 
/*
********************************** Defines **********************************
*/
 
// This is the number of additional ports to which to reply.
#define BLITZ_SIZE 3
 
#define MPLAYER_NAME_MAX    20
#define SERIAL_MAX          23
typedef unsigned char ForwardMaskType;
typedef enum NetCommandType {
    NET_MANGLER_REQUEST = 43,
    NET_MANGLER_RESPONSE = 44
} NetCommandType;
 
/*
** One byte alignment.
*/
#if !defined(__GNUC__)
#pragma pack(push, 1)
#define PACK
#else
#define PACK __attribute__ ((__packed__))
#endif
 
// size = 20 bytes
struct ManglerData {
    unsigned int        CRC PACK;
    unsigned short  magic PACK;
    unsigned short  packetID PACK;
    unsigned short  MyMangledPortNumber PACK;
    unsigned short  OriginalPortNumber PACK;
    unsigned char       MyMangledAddress[4] PACK;
    unsigned char       NetCommandType PACK;
    unsigned char       BlitzMe PACK;
    unsigned short  Padding PACK;
};
 
/*
   This is for older GCC versions that can't do byte-packing.
   Instead of declaring
    GlobalPacketType p;
    p.Command = NET_MANGLER_REQUEST;
   you would do something like this:
    GlobalPacketStruct p;
    Eval(&p, GPCommand, NetCommandType) = NET_MANGLER_REQUEST;
*/
#define Eval(x, y, z) ( *((z *)(&((x)->payload[(y)]))) )
 
#if !defined(__GNUC__)
#pragma pack(pop)
#endif
 
#endif // __MANGLER_H__