QuakeConnect.cpp

// QuakeConnect.cpp: implementation of the CQuakeConnect class.
//
// Pandora Bot v2.0
// By Darrin W. Cullop (dcullop@arizona.edu)
//
// Copyright (c) 1998-1999 by Darrin W. Cullop.  All Rights Reserved.		
//																			
// Permission to use, copy and distribute unedited copies of this whole
// document is hereby granted, provided that no fee is charged for the
// use or availability	of this document (other than the normal connection
// costs for on-line services, if applicable). The above copyright notice
// and this permission notice must be left intact in all copies of this
// document. Short excerpts of this document may be quoted in discussion
// groups or mailing list articles, as long as a reference to the full
// document is given.
//																			
// Commercial distribution of this document, in whole or in part,
// requires prior agreement with the author. Commercial distribution
// includes any means by which the user has to pay either for the support
// (e.g. book, newsletter or CD-ROM) or for the document itself.
//
// Unauthorized commercial distribution is prohibited.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Pandora.h"
#include "QuakeConnect.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// CQuakeConnect Checksum Data
//////////////////////////////////////////////////////////////////////

WORD crctable[256] =
{
	0x0000,	0x1021,	0x2042,	0x3063,	0x4084,	0x50a5,	0x60c6,	0x70e7,
	0x8108,	0x9129,	0xa14a,	0xb16b,	0xc18c,	0xd1ad,	0xe1ce,	0xf1ef,
	0x1231,	0x0210,	0x3273,	0x2252,	0x52b5,	0x4294,	0x72f7,	0x62d6,
	0x9339,	0x8318,	0xb37b,	0xa35a,	0xd3bd,	0xc39c,	0xf3ff,	0xe3de,
	0x2462,	0x3443,	0x0420,	0x1401,	0x64e6,	0x74c7,	0x44a4,	0x5485,
	0xa56a,	0xb54b,	0x8528,	0x9509,	0xe5ee,	0xf5cf,	0xc5ac,	0xd58d,
	0x3653,	0x2672,	0x1611,	0x0630,	0x76d7,	0x66f6,	0x5695,	0x46b4,
	0xb75b,	0xa77a,	0x9719,	0x8738,	0xf7df,	0xe7fe,	0xd79d,	0xc7bc,
	0x48c4,	0x58e5,	0x6886,	0x78a7,	0x0840,	0x1861,	0x2802,	0x3823,
	0xc9cc,	0xd9ed,	0xe98e,	0xf9af,	0x8948,	0x9969,	0xa90a,	0xb92b,
	0x5af5,	0x4ad4,	0x7ab7,	0x6a96,	0x1a71,	0x0a50,	0x3a33,	0x2a12,
	0xdbfd,	0xcbdc,	0xfbbf,	0xeb9e,	0x9b79,	0x8b58,	0xbb3b,	0xab1a,
	0x6ca6,	0x7c87,	0x4ce4,	0x5cc5,	0x2c22,	0x3c03,	0x0c60,	0x1c41,
	0xedae,	0xfd8f,	0xcdec,	0xddcd,	0xad2a,	0xbd0b,	0x8d68,	0x9d49,
	0x7e97,	0x6eb6,	0x5ed5,	0x4ef4,	0x3e13,	0x2e32,	0x1e51,	0x0e70,
	0xff9f,	0xefbe,	0xdfdd,	0xcffc,	0xbf1b,	0xaf3a,	0x9f59,	0x8f78,
	0x9188,	0x81a9,	0xb1ca,	0xa1eb,	0xd10c,	0xc12d,	0xf14e,	0xe16f,
	0x1080,	0x00a1,	0x30c2,	0x20e3,	0x5004,	0x4025,	0x7046,	0x6067,
	0x83b9,	0x9398,	0xa3fb,	0xb3da,	0xc33d,	0xd31c,	0xe37f,	0xf35e,
	0x02b1,	0x1290,	0x22f3,	0x32d2,	0x4235,	0x5214,	0x6277,	0x7256,
	0xb5ea,	0xa5cb,	0x95a8,	0x8589,	0xf56e,	0xe54f,	0xd52c,	0xc50d,
	0x34e2,	0x24c3,	0x14a0,	0x0481,	0x7466,	0x6447,	0x5424,	0x4405,
	0xa7db,	0xb7fa,	0x8799,	0x97b8,	0xe75f,	0xf77e,	0xc71d,	0xd73c,
	0x26d3,	0x36f2,	0x0691,	0x16b0,	0x6657,	0x7676,	0x4615,	0x5634,
	0xd94c,	0xc96d,	0xf90e,	0xe92f,	0x99c8,	0x89e9,	0xb98a,	0xa9ab,
	0x5844,	0x4865,	0x7806,	0x6827,	0x18c0,	0x08e1,	0x3882,	0x28a3,
	0xcb7d,	0xdb5c,	0xeb3f,	0xfb1e,	0x8bf9,	0x9bd8,	0xabbb,	0xbb9a,
	0x4a75,	0x5a54,	0x6a37,	0x7a16,	0x0af1,	0x1ad0,	0x2ab3,	0x3a92,
	0xfd2e,	0xed0f,	0xdd6c,	0xcd4d,	0xbdaa,	0xad8b,	0x9de8,	0x8dc9,
	0x7c26,	0x6c07,	0x5c64,	0x4c45,	0x3ca2,	0x2c83,	0x1ce0,	0x0cc1,
	0xef1f,	0xff3e,	0xcf5d,	0xdf7c,	0xaf9b,	0xbfba,	0x8fd9,	0x9ff8,
	0x6e17,	0x7e36,	0x4e55,	0x5e74,	0x2e93,	0x3eb2,	0x0ed1,	0x1ef0
};

BYTE ChecksumTable[1024] = 
{
	0x84, 0x47, 0x51, 0xc1, 0x93,
	0x22, 0x21, 0x24, 0x2f, 0x66,
	0x60, 0x4d, 0xb0, 0x7c, 0xda,
	0x88, 0x54, 0x15, 0x2b, 0xc6,
	0x6c, 0x89, 0xc5, 0x9d, 0x48,
	0xee, 0xe6, 0x8a, 0xb5, 0xf4,
	0xcb, 0xfb, 0xf1, 0x0c, 0x2e,
	0xa0, 0xd7, 0xc9, 0x1f, 0xd6,
	0x06, 0x9a, 0x09, 0x41, 0x54,
	0x67, 0x46, 0xc7, 0x74, 0xe3,
	0xc8, 0xb6, 0x5d, 0xa6, 0x36,
	0xc4, 0xab, 0x2c, 0x7e, 0x85,
	0xa8, 0xa4, 0xa6, 0x4d, 0x96,
	0x19, 0x19, 0x9a, 0xcc, 0xd8,
	0xac, 0x39, 0x5e, 0x3c, 0xf2,
	0xf5, 0x5a, 0x72, 0xe5, 0xa9,
	0xd1, 0xb3, 0x23, 0x82, 0x6f,
	0x29, 0xcb, 0xd1, 0xcc, 0x71,
	0xfb, 0xea, 0x92, 0xeb, 0x1c,
	0xca, 0x4c, 0x70, 0xfe, 0x4d,
	0xc9, 0x67, 0x43, 0x47, 0x94,
	0xb9, 0x47, 0xbc, 0x3f, 0x01,
	0xab, 0x7b, 0xa6, 0xe2, 0x76,
	0xef, 0x5a, 0x7a, 0x29, 0x0b,
	0x51, 0x54, 0x67, 0xd8, 0x1c,
	0x14, 0x3e, 0x29, 0xec, 0xe9,
	0x2d, 0x48, 0x67, 0xff, 0xed,
	0x54, 0x4f, 0x48, 0xc0, 0xaa,
	0x61, 0xf7, 0x78, 0x12, 0x03,
	0x7a, 0x9e, 0x8b, 0xcf, 0x83,
	0x7b, 0xae, 0xca, 0x7b, 0xd9,
	0xe9, 0x53, 0x2a, 0xeb, 0xd2,
	0xd8, 0xcd, 0xa3, 0x10, 0x25,
	0x78, 0x5a, 0xb5, 0x23, 0x06,
	0x93, 0xb7, 0x84, 0xd2, 0xbd,
	0x96, 0x75, 0xa5, 0x5e, 0xcf,
	0x4e, 0xe9, 0x50, 0xa1, 0xe6,
	0x9d, 0xb1, 0xe3, 0x85, 0x66,
	0x28, 0x4e, 0x43, 0xdc, 0x6e,
	0xbb, 0x33, 0x9e, 0xf3, 0x0d,
	0x00, 0xc1, 0xcf, 0x67, 0x34,
	0x06, 0x7c, 0x71, 0xe3, 0x63,
	0xb7, 0xb7, 0xdf, 0x92, 0xc4,
	0xc2, 0x25, 0x5c, 0xff, 0xc3,
	0x6e, 0xfc, 0xaa, 0x1e, 0x2a,
	0x48, 0x11, 0x1c, 0x36, 0x68,
	0x78, 0x86, 0x79, 0x30, 0xc3,
	0xd6, 0xde, 0xbc, 0x3a, 0x2a,
	0x6d, 0x1e, 0x46, 0xdd, 0xe0,
	0x80, 0x1e, 0x44, 0x3b, 0x6f,
	0xaf, 0x31, 0xda, 0xa2, 0xbd,
	0x77, 0x06, 0x56, 0xc0, 0xb7,
	0x92, 0x4b, 0x37, 0xc0, 0xfc,
	0xc2, 0xd5, 0xfb, 0xa8, 0xda,
	0xf5, 0x57, 0xa8, 0x18, 0xc0,
	0xdf, 0xe7, 0xaa, 0x2a, 0xe0,
	0x7c, 0x6f, 0x77, 0xb1, 0x26,
	0xba, 0xf9, 0x2e, 0x1d, 0x16,
	0xcb, 0xb8, 0xa2, 0x44, 0xd5,
	0x2f, 0x1a, 0x79, 0x74, 0x87,
	0x4b, 0x00, 0xc9, 0x4a, 0x3a,
	0x65, 0x8f, 0xe6, 0x5d, 0xe5,
	0x0a, 0x77, 0xd8, 0x1a, 0x14,
	0x41, 0x75, 0xb1, 0xe2, 0x50,
	0x2c, 0x93, 0x38, 0x2b, 0x6d,
	0xf3, 0xf6, 0xdb, 0x1f, 0xcd,
	0xff, 0x14, 0x70, 0xe7, 0x16,
	0xe8, 0x3d, 0xf0, 0xe3, 0xbc,
	0x5e, 0xb6, 0x3f, 0xcc, 0x81,
	0x24, 0x67, 0xf3, 0x97, 0x3b,
	0xfe, 0x3a, 0x96, 0x85, 0xdf,
	0xe4, 0x6e, 0x3c, 0x85, 0x05,
	0x0e, 0xa3, 0x2b, 0x07, 0xc8,
	0xbf, 0xe5, 0x13, 0x82, 0x62,
	0x08, 0x61, 0x69, 0x4b, 0x47,
	0x62, 0x73, 0x44, 0x64, 0x8e,
	0xe2, 0x91, 0xa6, 0x9a, 0xb7,
	0xe9, 0x04, 0xb6, 0x54, 0x0c,
	0xc5, 0xa9, 0x47, 0xa6, 0xc9,
	0x08, 0xfe, 0x4e, 0xa6, 0xcc,
	0x8a, 0x5b, 0x90, 0x6f, 0x2b,
	0x3f, 0xb6, 0x0a, 0x96, 0xc0,
	0x78, 0x58, 0x3c, 0x76, 0x6d,
	0x94, 0x1a, 0xe4, 0x4e, 0xb8,
	0x38, 0xbb, 0xf5, 0xeb, 0x29,
	0xd8, 0xb0, 0xf3, 0x15, 0x1e,
	0x99, 0x96, 0x3c, 0x5d, 0x63,
	0xd5, 0xb1, 0xad, 0x52, 0xb8,
	0x55, 0x70, 0x75, 0x3e, 0x1a,
	0xd5, 0xda, 0xf6, 0x7a, 0x48,
	0x7d, 0x44, 0x41, 0xf9, 0x11,
	0xce, 0xd7, 0xca, 0xa5, 0x3d,
	0x7a, 0x79, 0x7e, 0x7d, 0x25,
	0x1b, 0x77, 0xbc, 0xf7, 0xc7,
	0x0f, 0x84, 0x95, 0x10, 0x92,
	0x67, 0x15, 0x11, 0x5a, 0x5e,
	0x41, 0x66, 0x0f, 0x38, 0x03,
	0xb2, 0xf1, 0x5d, 0xf8, 0xab,
	0xc0, 0x02, 0x76, 0x84, 0x28,
	0xf4, 0x9d, 0x56, 0x46, 0x60,
	0x20, 0xdb, 0x68, 0xa7, 0xbb,
	0xee, 0xac, 0x15, 0x01, 0x2f,
	0x20, 0x09, 0xdb, 0xc0, 0x16,
	0xa1, 0x89, 0xf9, 0x94, 0x59,
	0x00, 0xc1, 0x76, 0xbf, 0xc1,
	0x4d, 0x5d, 0x2d, 0xa9, 0x85,
	0x2c, 0xd6, 0xd3, 0x14, 0xcc,
	0x02, 0xc3, 0xc2, 0xfa, 0x6b,
	0xb7, 0xa6, 0xef, 0xdd, 0x12,
	0x26, 0xa4, 0x63, 0xe3, 0x62,
	0xbd, 0x56, 0x8a, 0x52, 0x2b,
	0xb9, 0xdf, 0x09, 0xbc, 0x0e,
	0x97, 0xa9, 0xb0, 0x82, 0x46,
	0x08, 0xd5, 0x1a, 0x8e, 0x1b,
	0xa7, 0x90, 0x98, 0xb9, 0xbb,
	0x3c, 0x17, 0x9a, 0xf2, 0x82,
	0xba, 0x64, 0x0a, 0x7f, 0xca,
	0x5a, 0x8c, 0x7c, 0xd3, 0x79,
	0x09, 0x5b, 0x26, 0xbb, 0xbd,
	0x25, 0xdf, 0x3d, 0x6f, 0x9a,
	0x8f, 0xee, 0x21, 0x66, 0xb0,
	0x8d, 0x84, 0x4c, 0x91, 0x45,
	0xd4, 0x77, 0x4f, 0xb3, 0x8c,
	0xbc, 0xa8, 0x99, 0xaa, 0x19,
	0x53, 0x7c, 0x02, 0x87, 0xbb,
	0x0b, 0x7c, 0x1a, 0x2d, 0xdf,
	0x48, 0x44, 0x06, 0xd6, 0x7d,
	0x0c, 0x2d, 0x35, 0x76, 0xae,
	0xc4, 0x5f, 0x71, 0x85, 0x97,
	0xc4, 0x3d, 0xef, 0x52, 0xbe,
	0x00, 0xe4, 0xcd, 0x49, 0xd1,
	0xd1, 0x1c, 0x3c, 0xd0, 0x1c,
	0x42, 0xaf, 0xd4, 0xbd, 0x58,
	0x34, 0x07, 0x32, 0xee, 0xb9,
	0xb5, 0xea, 0xff, 0xd7, 0x8c,
	0x0d, 0x2e, 0x2f, 0xaf, 0x87,
	0xbb, 0xe6, 0x52, 0x71, 0x22,
	0xf5, 0x25, 0x17, 0xa1, 0x82,
	0x04, 0xc2, 0x4a, 0xbd, 0x57,
	0xc6, 0xab, 0xc8, 0x35, 0x0c,
	0x3c, 0xd9, 0xc2, 0x43, 0xdb,
	0x27, 0x92, 0xcf, 0xb8, 0x25,
	0x60, 0xfa, 0x21, 0x3b, 0x04,
	0x52, 0xc8, 0x96, 0xba, 0x74,
	0xe3, 0x67, 0x3e, 0x8e, 0x8d,
	0x61, 0x90, 0x92, 0x59, 0xb6,
	0x1a, 0x1c, 0x5e, 0x21, 0xc1,
	0x65, 0xe5, 0xa6, 0x34, 0x05,
	0x6f, 0xc5, 0x60, 0xb1, 0x83,
	0xc1, 0xd5, 0xd5, 0xed, 0xd9,
	0xc7, 0x11, 0x7b, 0x49, 0x7a,
	0xf9, 0xf9, 0x84, 0x47, 0x9b,
	0xe2, 0xa5, 0x82, 0xe0, 0xc2,
	0x88, 0xd0, 0xb2, 0x58, 0x88,
	0x7f, 0x45, 0x09, 0x67, 0x74,
	0x61, 0xbf, 0xe6, 0x40, 0xe2,
	0x9d, 0xc2, 0x47, 0x05, 0x89,
	0xed, 0xcb, 0xbb, 0xb7, 0x27,
	0xe7, 0xdc, 0x7a, 0xfd, 0xbf,
	0xa8, 0xd0, 0xaa, 0x10, 0x39,
	0x3c, 0x20, 0xf0, 0xd3, 0x6e,
	0xb1, 0x72, 0xf8, 0xe6, 0x0f,
	0xef, 0x37, 0xe5, 0x09, 0x33,
	0x5a, 0x83, 0x43, 0x80, 0x4f,
	0x65, 0x2f, 0x7c, 0x8c, 0x6a,
	0xa0, 0x82, 0x0c, 0xd4, 0xd4,
	0xfa, 0x81, 0x60, 0x3d, 0xdf,
	0x06, 0xf1, 0x5f, 0x08, 0x0d,
	0x6d, 0x43, 0xf2, 0xe3, 0x11,
	0x7d, 0x80, 0x32, 0xc5, 0xfb,
	0xc5, 0xd9, 0x27, 0xec, 0xc6,
	0x4e, 0x65, 0x27, 0x76, 0x87,
	0xa6, 0xee, 0xee, 0xd7, 0x8b,
	0xd1, 0xa0, 0x5c, 0xb0, 0x42,
	0x13, 0x0e, 0x95, 0x4a, 0xf2,
	0x06, 0xc6, 0x43, 0x33, 0xf4,
	0xc7, 0xf8, 0xe7, 0x1f, 0xdd,
	0xe4, 0x46, 0x4a, 0x70, 0x39,
	0x6c, 0xd0, 0xed, 0xca, 0xbe,
	0x60, 0x3b, 0xd1, 0x7b, 0x57,
	0x48, 0xe5, 0x3a, 0x79, 0xc1,
	0x69, 0x33, 0x53, 0x1b, 0x80,
	0xb8, 0x91, 0x7d, 0xb4, 0xf6,
	0x17, 0x1a, 0x1d, 0x5a, 0x32,
	0xd6, 0xcc, 0x71, 0x29, 0x3f,
	0x28, 0xbb, 0xf3, 0x5e, 0x71,
	0xb8, 0x43, 0xaf, 0xf8, 0xb9,
	0x64, 0xef, 0xc4, 0xa5, 0x6c,
	0x08, 0x53, 0xc7, 0x00, 0x10,
	0x39, 0x4f, 0xdd, 0xe4, 0xb6,
	0x19, 0x27, 0xfb, 0xb8, 0xf5,
	0x32, 0x73, 0xe5, 0xcb, 0x32,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
};

//////////////////////////////////////////////////////////////////////
// CQuakeConnect Definitions
//////////////////////////////////////////////////////////////////////

#define TIMEOUTS_CONNECTING			3
#define TIMEOUTS_CONNECTED			5

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CQuakeConnect::CQuakeConnect()
{
	m_qsSocket.SetConnector( this );
	m_csStatus = csNotConnected;
	m_nTimeOuts = 0;
}

//////////////////////////////////////////////////////////////////////
// Overridables
//////////////////////////////////////////////////////////////////////

void CQuakeConnect::ProcessTimeOut()
{
	ProcessErrorMessage( IDS_ERR_TIMEOUT );
	if ( m_csStatus != csConnected )
	{
		m_qsSocket.ResendLastConnectionless();
	}
	if (++m_nTimeOuts >= ((m_csStatus == csConnected) ? TIMEOUTS_CONNECTED : TIMEOUTS_CONNECTING))
	{
		OnDisconnected();
	}
}

void CQuakeConnect::OnDisconnected()
{
	m_qsSocket.Disconnect();
	m_csStatus = csNotConnected;
	m_nTimeOuts = 0;
}

//////////////////////////////////////////////////////////////////////
// Private Operations
//////////////////////////////////////////////////////////////////////

WORD CQuakeConnect::DoChecksumCRC( BYTE* pBuffer, BYTE nLength ) const
{
	register int	nCount;
	WORD		nReturn = 0xFFFF;

	if ( nLength != 0 )
	{
		for ( nCount = 0 ; nCount < nLength ; nCount++, pBuffer++ )
		{
			nReturn = ( (nReturn << 8) ^ crctable[((nReturn >> 8) ^ *pBuffer)] );
		}
	}
	return nReturn;
}

//////////////////////////////////////////////////////////////////////
// Protected Operations
//////////////////////////////////////////////////////////////////////

BYTE CQuakeConnect::ComputeChecksum( CQuakePacket* pData, const UINT& nSeqNum ) const
{
	WORD	nOffset = ( nSeqNum % 1020 );
	BYTE*	pExtra = ( (BYTE*)ChecksumTable + nOffset );
	BYTE	arrTemp[64];
	BYTE	nSize;
	BYTE	nChecksum;
	int		i, j;

	pData->CheckLength();
	nSize = pData->GetSize();
	if ( nSize > 60 )
	{
		nSize = 60;
	}
	CopyMemory( arrTemp, pData->GetDataPtr(), nSize );
	arrTemp[nSize]		= pExtra[0];
	arrTemp[nSize+1]	= pExtra[1];
	arrTemp[nSize+2]	= pExtra[2];
	arrTemp[nSize+3]	= pExtra[3];
	nChecksum = DoChecksumCRC(arrTemp, nSize+4);
	j = 0;
	for ( i = 0; i < nSize+4 ; i++ )
	{
		j += arrTemp[i];
	}

	return ( (nChecksum ^ j) & 0xFF );
}

void CQuakeConnect::Disconnect()
{
	if ( m_csStatus == csConnected )
	{
		SendDisconnect();
	}
	else
	{
		OnDisconnected();
	}
}

//////////////////////////////////////////////////////////////////////
// End of QuakeConnect.cpp
//////////////////////////////////////////////////////////////////////