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https://github.com/electronicarts/CnC_Renegade.git
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Initial commit of Command & Conquer Renegade source code.
This commit is contained in:
LFeenanEA
481
Code/WWOnline/GameResPacket.cpp
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481
Code/WWOnline/GameResPacket.cpp
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/*
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** Command & Conquer Renegade(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/******************************************************************************
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*
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* FILE
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* $Archive: /Commando/Code/WWOnline/GameResPacket.cpp $
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*
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* DESCRIPTION
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*
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* PROGRAMMER
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* $Author: Denzil_l $
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*
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* VERSION INFO
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* $Revision: 4 $
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* $Modtime: 12/11/01 6:23p $
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*
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******************************************************************************/
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#include "GameResPacket.h"
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#include <assert.h>
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#include <string.h>
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#include <winsock.h>
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namespace WWOnline {
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/**************************************************************************
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* GameResPacket::~GameResPacket -- destroys a packet class be freeing list *
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* *
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* INPUT: none *
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* *
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* OUTPUT: none *
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* *
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* HISTORY: *
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* 04/24/1996 PWG : Created. *
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*========================================================================*/
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GameResPacket::~GameResPacket(void)
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{
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GameResField* current;
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GameResField* next;
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// Loop through the entire field list and delete each entry.
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for (current = mHead; current; current = next)
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{
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next = current->mNext;
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delete current;
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}
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}
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/**************************************************************************
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* GameResPacket::ADD_FIELD -- Adds a GameResField entry to head of packet li *
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* *
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* INPUT: GameResField * - a properly constructed field class entry. *
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* *
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* OUTPUT: none *
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* *
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* HISTORY: *
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* 04/24/1996 PWG : Created. *
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*========================================================================*/
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void GameResPacket::Add_Field(GameResField *field)
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{
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field->mNext = mHead;
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mHead = field;
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}
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/**************************************************************************
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* GameResPacket::GameResPacket -- Creates a Packet object from a COMMS packe *
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* *
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* INPUT: *
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* *
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* OUTPUT: *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 04/22/1996 PWG : Created. *
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*========================================================================*/
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GameResPacket::GameResPacket(unsigned char* curbuf)
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{
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// Pull the size and packet ID out of the linear packet stream.
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mSize = ntohl(*(unsigned long*)curbuf);
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curbuf += sizeof(mSize);
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mID = ntohs(*(unsigned short*)curbuf);
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curbuf += sizeof(mID);
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mReserved = ntohs(*(unsigned short*)curbuf);
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curbuf += sizeof(mReserved);
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mHead = NULL;
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// Calculate the remaining size so that we can loop through the
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// packets and extract them.
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unsigned long remaining_size = (mSize - (sizeof(mSize) + sizeof(mID) + sizeof(mReserved)));
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// Loop through the linear packet until we run out of room and
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// create a field for each.
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while (remaining_size > 0)
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{
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GameResField* field = new GameResField;
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// Copy the adjusted header into the buffer and then advance the buffer
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memcpy(field, curbuf, GAMERESFIELD_HEADER_SIZE);
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curbuf += GAMERESFIELD_HEADER_SIZE;
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remaining_size -= GAMERESFIELD_HEADER_SIZE;
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// Copy the data into the buffer
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unsigned short size = ntohs(field->mSize);
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field->mData = new unsigned char[size];
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memcpy(field->mData, curbuf, size);
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curbuf += size;
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remaining_size -= size;
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// Make sure we allow for the pad bytes.
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int pad = (4 - (ntohs(field->mSize) & 3)) & 3;
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curbuf += pad;
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remaining_size -= pad;
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// Convert the field back to the host format
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field->Net_To_Host();
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// Finally add the field to the field list in the packet
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// structure.
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Add_Field(field);
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}
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}
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/**************************************************************************
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* CREATE_COMMS_PACKET -- Walks field list creating a packet *
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* *
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* INPUT: short - the id of the packet so the server can identify it *
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* unsigned short & - the size of the packet returned here *
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* *
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* OUTPUT: void * pointer to the linear packet data *
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* *
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* WARNINGS: This routine allocates memory that the user is responsible*
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* for freeing. *
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* *
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* HISTORY: *
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* 04/22/1996 PWG : Created. *
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*========================================================================*/
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unsigned char* GameResPacket::Create_Comms_Packet(unsigned long& size, char* sig_name, unsigned long& sig_offset)
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{
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GameResField* current;
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sig_offset = 0;
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// Size starts at 8 because that is the size of the packet header. (size[4] + id[2] + reserved[2])
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size = (sizeof(mSize) + sizeof(mID) + sizeof(mReserved));
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// Take a quick spin through and calculate the size of the packet we
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// are building.
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for (current = mHead; current; current = current->mNext)
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{
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size += (unsigned long)GAMERESFIELD_HEADER_SIZE; // add in packet header size
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size += current->mSize; // add in data size
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size += (4 - (current->mSize & 3)) & 3; // add in pad value to dword align next packet
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}
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// Now that we know the size allocate a buffer big enough to hold the
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// packet.
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unsigned char* bufferStart = new unsigned char[size];
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unsigned char* curbuf = bufferStart;
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// write the size into the packet header
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*(unsigned long*)curbuf = htonl(size);
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curbuf += sizeof(unsigned long);
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*(unsigned short*)curbuf = htons(mID);
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curbuf += sizeof(unsigned short);
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*(unsigned short*)curbuf = htons(mReserved);
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curbuf += sizeof(unsigned short);
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// Ok now that the actual header information has been written we need to write out
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// field information.
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for (current = mHead; current; current = current->mNext)
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{
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#ifdef _DEBUG
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current->DebugDump();
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#endif
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unsigned short fieldSize = current->mSize;
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// Temporarily convert the packet to net format (this saves alot of
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// effort, and seems safe...)
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current->Host_To_Net();
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// Copy the adjusted header into the buffer and then advance the buffer
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memcpy(curbuf, current, GAMERESFIELD_HEADER_SIZE);
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curbuf += GAMERESFIELD_HEADER_SIZE;
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// If this is the sig data then make a note of the offset into the packet.
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if (sig_name && strncmp(sig_name, current->mID, 4) == 0)
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{
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// If sig_offset isn't zero then that would indicate that there were multiple sig entries in the packet.
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assert(sig_offset == 0);
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sig_offset = (curbuf - bufferStart);
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}
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// Copy the data into the buffer and then advance the buffer
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memcpy(curbuf, current->mData, fieldSize);
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curbuf += fieldSize;
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// Finally take care of any pad bytes by setting them to 0
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int pad = ((4 - (fieldSize & 3)) & 3);
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// If there is any pad left over, make sure you memset it
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// to zeros, so it looks like a pad.
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if (pad)
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{
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memset(curbuf, 0, pad);
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curbuf += pad;
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}
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current->Net_To_Host();
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}
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return bufferStart;
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}
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/**************************************************************************
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* GameResPacket::FIND_FIELD -- Finds a field if it exists in the packets *
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* *
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* INPUT: char * - the id of the field we are looking for. *
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* *
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* OUTPUT: GameResField * pointer to the field class *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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GameResField *GameResPacket::Find_Field(char *id)
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{
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for (GameResField *current = mHead; current; current = current->mNext)
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{
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if (strncmp(id, current->mID, 4) == 0)
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return current;
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}
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return NULL;
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* char & - the reference to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, char &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((char*)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* unsigned char & - the reference to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, unsigned char &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((unsigned char *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* short & - the reference to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, short &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((short *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* unsigned short & - the reference to store the data into*
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, unsigned short &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((unsigned short *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* long & - the reference to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, long &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((long *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data as a string *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* char * - the string to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The string is not changed if the field is not found. It *
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* is assumed that the string variabled specified by the *
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* pointer is large enough to hold the data. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, char *data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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strcpy(data, (char *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data *
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* unsigned long & - the reference to store the data into *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 04/23/1996 PWG : Created. *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, unsigned long &data)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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data = *((unsigned long *)field->mData);
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}
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return((field) ? true : false);
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}
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/**************************************************************************
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* GET_FIELD -- Find specified name and returns data *
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* *
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* INPUT: char * - the id of the field that holds the data. *
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* void * - the reference to store the data into *
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* int - the length of the buffer passed in *
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* *
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* OUTPUT: true if the field was found, false if it was not. *
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* *
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* WARNINGS: The data reference is not changed if the field is not *
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* found. *
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* *
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* HISTORY: *
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* 6/4/96 4:46PM ST : Created *
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*========================================================================*/
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bool GameResPacket::Get_Field(char *id, void *data, int &length)
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{
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GameResField *field = Find_Field(id);
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if (field)
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{
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memcpy(data, field->mData, min((int)field->mSize, length));
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length = (int) field->mSize;
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}
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return((field) ? true : false);
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}
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} // namespace WWOnline
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