/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others

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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// common.c -- misc functions used in client and server

#include "quakedef.h"

static char     *largv[MAX_NUM_ARGVS + 1];
static char     argvdummy[] = " ";

int             safemode;

cvar_t  registered = {"registered","0"};
cvar_t  cmdline = {"cmdline","", false, true};

qboolean        com_modified;   // set true if using non-id files

int com_nummissionpacks; //johnfitz

qboolean		proghack;

int             static_registered = 1;  // only for startup check, then set

qboolean		msg_suppress_1 = 0;

qboolean		fitzmode;

void COM_InitFilesystem (void);

// if a packfile directory differs from this, it is assumed to be hacked
#define PAK0_COUNT              339
#define PAK0_CRC                32981

char	com_token[1024];
int		com_argc;
char	**com_argv;

#define CMDLINE_LENGTH	256 //johnfitz -- mirrored in cmd.c
char	com_cmdline[CMDLINE_LENGTH];

qboolean standard_quake = true, rogue, hipnotic;

// this graphic needs to be in the pak file to use registered features
unsigned short pop[] =
{
 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
,0x0000,0x0000,0x6600,0x0000,0x0000,0x0000,0x6600,0x0000
,0x0000,0x0066,0x0000,0x0000,0x0000,0x0000,0x0067,0x0000
,0x0000,0x6665,0x0000,0x0000,0x0000,0x0000,0x0065,0x6600
,0x0063,0x6561,0x0000,0x0000,0x0000,0x0000,0x0061,0x6563
,0x0064,0x6561,0x0000,0x0000,0x0000,0x0000,0x0061,0x6564
,0x0064,0x6564,0x0000,0x6469,0x6969,0x6400,0x0064,0x6564
,0x0063,0x6568,0x6200,0x0064,0x6864,0x0000,0x6268,0x6563
,0x0000,0x6567,0x6963,0x0064,0x6764,0x0063,0x6967,0x6500
,0x0000,0x6266,0x6769,0x6a68,0x6768,0x6a69,0x6766,0x6200
,0x0000,0x0062,0x6566,0x6666,0x6666,0x6666,0x6562,0x0000
,0x0000,0x0000,0x0062,0x6364,0x6664,0x6362,0x0000,0x0000
,0x0000,0x0000,0x0000,0x0062,0x6662,0x0000,0x0000,0x0000
,0x0000,0x0000,0x0000,0x0061,0x6661,0x0000,0x0000,0x0000
,0x0000,0x0000,0x0000,0x0000,0x6500,0x0000,0x0000,0x0000
,0x0000,0x0000,0x0000,0x0000,0x6400,0x0000,0x0000,0x0000
};

/*


All of Quake's data access is through a hierchal file system, but the contents
of the file system can be transparently merged from several sources.

The "base directory" is the path to the directory holding the quake.exe and all
game directories.  The sys_* files pass this to host_init in quakeparms_t->basedir.
This can be overridden with the "-basedir" command line parm to allow code
debugging in a different directory.  The base directory is only used during
filesystem initialization.

The "game directory" is the first tree on the search path and directory that all
generated files (savegames, screenshots, demos, config files) will be saved to.
This can be overridden with the "-game" command line parameter.  The game
directory can never be changed while quake is executing.  This is a precacution
against having a malicious server instruct clients to write files over areas they
shouldn't.

The "cache directory" is only used during development to save network bandwidth,
especially over ISDN / T1 lines.  If there is a cache directory specified, when
a file is found by the normal search path, it will be mirrored into the cache
directory, then opened there.

FIXME:
The file "parms.txt" will be read out of the game directory and appended to the
current command line arguments to allow different games to initialize startup
parms differently.  This could be used to add a "-sspeed 22050" for the high
quality sound edition.  Because they are added at the end, they will not
override an explicit setting on the original command line.

*/

//============================================================================


// ClearLink is used for new headnodes
void ClearLink (link_t *l)
{
	l->prev = l->next = l;
}

void RemoveLink (link_t *l)
{
	l->next->prev = l->prev;
	l->prev->next = l->next;
}

void InsertLinkBefore (link_t *l, link_t *before)
{
	l->next = before;
	l->prev = before->prev;
	l->prev->next = l;
	l->next->prev = l;
}
void InsertLinkAfter (link_t *l, link_t *after)
{
	l->next = after->next;
	l->prev = after;
	l->prev->next = l;
	l->next->prev = l;
}

/*
============================================================================

					LIBRARY REPLACEMENT FUNCTIONS

============================================================================
*/

int q_vsnprintf(char *str, size_t size, const char *format, va_list args)
{
	int		ret;

	ret = vsnprintf_func (str, size, format, args);

	if (ret < 0)
		ret = (int)size;

	if ((size_t)ret >= size)
		str[size - 1] = '\0';

	return ret;
}

int q_snprintf (char *str, size_t size, const char *format, ...)
{
	int		ret;
	va_list		argptr;

	va_start (argptr, format);
	ret = q_vsnprintf (str, size, format, argptr);
	va_end (argptr);

	return ret;
}

void Q_memset (void *dest, int fill, size_t count)
{
	size_t		i;

	if ( (((size_t)dest | count) & 3) == 0)
	{
		count >>= 2;
		fill = fill | (fill<<8) | (fill<<16) | (fill<<24);
		for (i=0 ; i<count ; i++)
			((int *)dest)[i] = fill;
	}
	else
		for (i=0 ; i<count ; i++)
			((byte *)dest)[i] = fill;
}

void Q_memcpy (void *dest, const void *src, size_t count)
{
	size_t		i;

	if (( ( (size_t)dest | (size_t)src | count) & 3) == 0 )
	{
		count>>=2;
		for (i=0 ; i<count ; i++)
			((int *)dest)[i] = ((int *)src)[i];
	}
	else
		for (i=0 ; i<count ; i++)
			((byte *)dest)[i] = ((byte *)src)[i];
}

int Q_memcmp (const void *m1, const void *m2, size_t count)
{
	while(count)
	{
		count--;
		if (((byte *)m1)[count] != ((byte *)m2)[count])
			return -1;
	}
	return 0;
}

void Q_strcpy (char *dest, const char *src)
{
	while (*src)
	{
		*dest++ = *src++;
	}
	*dest++ = 0;
}

void Q_strncpy (char *dest, const char *src, int count)
{
	while (*src && count--)
	{
		*dest++ = *src++;
	}
	if (count)
		*dest++ = 0;
}

int Q_strlen (const char *str)
{
	int             count;

	count = 0;
	while (str[count])
		count++;

	return count;
}

char *Q_strrchr(const char *s, char c)
{
    int len = Q_strlen(s);
    s += len;
    while (len--)
	if (*--s == c) return (char *)s;
    return NULL;
}

void Q_strcat (char *dest, const char *src)
{
	dest += Q_strlen(dest);
	Q_strcpy (dest, src);
}

int Q_strcmp (const char *s1, const char *s2)
{
	while (1)
	{
		if (*s1 != *s2)
			return -1;              // strings not equal
		if (!*s1)
			return 0;               // strings are equal
		s1++;
		s2++;
	}

	return -1;
}

int Q_strncmp (const char *s1, const char *s2, int count)
{
	while (1)
	{
		if (!count--)
			return 0;
		if (*s1 != *s2)
			return -1;              // strings not equal
		if (!*s1)
			return 0;               // strings are equal
		s1++;
		s2++;
	}

	return -1;
}

int Q_strncasecmp (const char *s1, const char *s2, int n)
{
	int             c1, c2;

	if (s1 == s2 || n <= 0)
		return 0;

	while (1)
	{
		c1 = *s1++;
		c2 = *s2++;

		if (!n--)
			return 0;               // strings are equal until end point

		if (c1 != c2)
		{
			if (c1 >= 'a' && c1 <= 'z')
				c1 -= ('a' - 'A');
			if (c2 >= 'a' && c2 <= 'z')
				c2 -= ('a' - 'A');
		}
		if (!c1)
			return (c2 == 0) ? 0 : -1;
		if (c1 < c2)
			return -1;
		if (c1 > c2)
			return 1;
	}
}

int Q_strcasecmp (const char *s1, const char *s2)
{
	return Q_strncasecmp (s1, s2, 99999);
}

int Q_atoi (const char *str)
{
	int             val;
	int             sign;
	int             c;

	if (*str == '-')
	{
		sign = -1;
		str++;
	}
	else
		sign = 1;

	val = 0;

//
// check for hex
//
	if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
	{
		str += 2;
		while (1)
		{
			c = *str++;
			if (c >= '0' && c <= '9')
				val = (val<<4) + c - '0';
			else if (c >= 'a' && c <= 'f')
				val = (val<<4) + c - 'a' + 10;
			else if (c >= 'A' && c <= 'F')
				val = (val<<4) + c - 'A' + 10;
			else
				return val*sign;
		}
	}

//
// check for character
//
	if (str[0] == '\'')
	{
		return sign * str[1];
	}

//
// assume decimal
//
	while (1)
	{
		c = *str++;
		if (c <'0' || c > '9')
			return val*sign;
		val = val*10 + c - '0';
	}

	return 0;
}


float Q_atof (const char *str)
{
	double			val;
	int             sign;
	int             c;
	int             decimal, total;

	if (*str == '-')
	{
		sign = -1;
		str++;
	}
	else
		sign = 1;

	val = 0;

//
// check for hex
//
	if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
	{
		str += 2;
		while (1)
		{
			c = *str++;
			if (c >= '0' && c <= '9')
				val = (val*16) + c - '0';
			else if (c >= 'a' && c <= 'f')
				val = (val*16) + c - 'a' + 10;
			else if (c >= 'A' && c <= 'F')
				val = (val*16) + c - 'A' + 10;
			else
				return val*sign;
		}
	}

//
// check for character
//
	if (str[0] == '\'')
	{
		return sign * str[1];
	}

//
// assume decimal
//
	decimal = -1;
	total = 0;
	while (1)
	{
		c = *str++;
		if (c == '.')
		{
			decimal = total;
			continue;
		}
		if (c <'0' || c > '9')
			break;
		val = val*10 + c - '0';
		total++;
	}

	if (decimal == -1)
		return val*sign;
	while (total > decimal)
	{
		val /= 10;
		total--;
	}

	return val*sign;
}

/*
============================================================================

					BYTE ORDER FUNCTIONS

============================================================================
*/

qboolean        bigendien;

short   (*BigShort) (short l);
short   (*LittleShort) (short l);
int     (*BigLong) (int l);
int     (*LittleLong) (int l);
float   (*BigFloat) (float l);
float   (*LittleFloat) (float l);

short   ShortSwap (short l)
{
	byte    b1,b2;

	b1 = l&255;
	b2 = (l>>8)&255;

	return (b1<<8) + b2;
}

short   ShortNoSwap (short l)
{
	return l;
}

int    LongSwap (int l)
{
	byte    b1,b2,b3,b4;

	b1 = l&255;
	b2 = (l>>8)&255;
	b3 = (l>>16)&255;
	b4 = (l>>24)&255;

	return ((int)b1<<24) + ((int)b2<<16) + ((int)b3<<8) + b4;
}

int     LongNoSwap (int l)
{
	return l;
}

float FloatSwap (float f)
{
	union
	{
		float   f;
		byte    b[4];
	} dat1, dat2;


	dat1.f = f;
	dat2.b[0] = dat1.b[3];
	dat2.b[1] = dat1.b[2];
	dat2.b[2] = dat1.b[1];
	dat2.b[3] = dat1.b[0];
	return dat2.f;
}

float FloatNoSwap (float f)
{
	return f;
}

/*
==============================================================================

			MESSAGE IO FUNCTIONS

Handles byte ordering and avoids alignment errors
==============================================================================
*/

//
// writing functions
//

void MSG_WriteChar (sizebuf_t *sb, int c)
{
	byte    *buf;

#ifdef PARANOID
	if (c < -128 || c > 127)
		Sys_Error ("MSG_WriteChar: range error");
#endif

	buf = (byte *) SZ_GetSpace (sb, 1);
	buf[0] = c;
}

void MSG_WriteByte (sizebuf_t *sb, int c)
{
	byte    *buf;

#ifdef PARANOID
	if (c < 0 || c > 255)
		Sys_Error ("MSG_WriteByte: range error");
#endif

	buf = (byte *) SZ_GetSpace (sb, 1);
	buf[0] = c;
}

void MSG_WriteShort (sizebuf_t *sb, int c)
{
	byte    *buf;

#ifdef PARANOID
	if (c < ((short)0x8000) || c > (short)0x7fff)
		Sys_Error ("MSG_WriteShort: range error");
#endif

	buf = (byte *) SZ_GetSpace (sb, 2);
	buf[0] = c&0xff;
	buf[1] = c>>8;
}

void MSG_WriteLong (sizebuf_t *sb, int c)
{
	byte    *buf;

	buf = (byte *) SZ_GetSpace (sb, 4);
	buf[0] = c&0xff;
	buf[1] = (c>>8)&0xff;
	buf[2] = (c>>16)&0xff;
	buf[3] = c>>24;
}

void MSG_WriteFloat (sizebuf_t *sb, float f)
{
	union
	{
		float   f;
		int     l;
	} dat;


	dat.f = f;
	dat.l = LittleLong (dat.l);

	SZ_Write (sb, &dat.l, 4);
}

void MSG_WriteString (sizebuf_t *sb, const char *s)
{
	if (!s)
		SZ_Write (sb, "", 1);
	else
		SZ_Write (sb, s, Q_strlen(s)+1);
}

//johnfitz -- original behavior, 13.3 fixed point coords, max range +-4096
void MSG_WriteCoord16 (sizebuf_t *sb, float f)
{
	MSG_WriteShort (sb, Q_rint(f*8));
}

//johnfitz -- 16.8 fixed point coords, max range +-32768
void MSG_WriteCoord24 (sizebuf_t *sb, float f)
{
	MSG_WriteShort (sb, f);
	MSG_WriteByte (sb, (int)(f*255)%255);
}

//johnfitz -- 32-bit float coords
void MSG_WriteCoord32f (sizebuf_t *sb, float f)
{
	MSG_WriteFloat (sb, f);
}

void MSG_WriteCoord (sizebuf_t *sb, float f)
{
	MSG_WriteCoord16 (sb, f);
}

void MSG_WriteAngle (sizebuf_t *sb, float f)
{
	MSG_WriteByte (sb, Q_rint(f * 256.0 / 360.0) & 255); //johnfitz -- use Q_rint instead of (int)
}

//johnfitz -- for PROTOCOL_FITZQUAKE
void MSG_WriteAngle16 (sizebuf_t *sb, float f)
{
	MSG_WriteShort (sb, Q_rint(f * 65536.0 / 360.0) & 65535);
}
//johnfitz

//
// reading functions
//
int                     msg_readcount;
qboolean        msg_badread;

void MSG_BeginReading (void)
{
	msg_readcount = 0;
	msg_badread = false;
}

// returns -1 and sets msg_badread if no more characters are available
int MSG_ReadChar (void)
{
	int     c;

	if (msg_readcount+1 > net_message.cursize)
	{
		msg_badread = true;
		return -1;
	}

	c = (signed char)net_message.data[msg_readcount];
	msg_readcount++;

	return c;
}

int MSG_ReadByte (void)
{
	int     c;

	if (msg_readcount+1 > net_message.cursize)
	{
		msg_badread = true;
		return -1;
	}

	c = (unsigned char)net_message.data[msg_readcount];
	msg_readcount++;

	return c;
}

int MSG_ReadShort (void)
{
	int     c;

	if (msg_readcount+2 > net_message.cursize)
	{
		msg_badread = true;
		return -1;
	}

	c = (short)(net_message.data[msg_readcount]
	+ (net_message.data[msg_readcount+1]<<8));

	msg_readcount += 2;

	return c;
}

int MSG_ReadLong (void)
{
	int     c;

	if (msg_readcount+4 > net_message.cursize)
	{
		msg_badread = true;
		return -1;
	}

	c = net_message.data[msg_readcount]
	+ (net_message.data[msg_readcount+1]<<8)
	+ (net_message.data[msg_readcount+2]<<16)
	+ (net_message.data[msg_readcount+3]<<24);

	msg_readcount += 4;

	return c;
}

float MSG_ReadFloat (void)
{
	union
	{
		byte    b[4];
		float   f;
		int     l;
	} dat;

	dat.b[0] =      net_message.data[msg_readcount];
	dat.b[1] =      net_message.data[msg_readcount+1];
	dat.b[2] =      net_message.data[msg_readcount+2];
	dat.b[3] =      net_message.data[msg_readcount+3];
	msg_readcount += 4;

	dat.l = LittleLong (dat.l);

	return dat.f;
}

const char *MSG_ReadString (void)
{
	static char     string[2048];
	int             l,c;

	l = 0;
	do
	{
		c = MSG_ReadChar ();
		if (c == -1 || c == 0)
			break;
		string[l] = c;
		l++;
	} while (l < sizeof(string)-1);

	string[l] = 0;

	return string;
}

//johnfitz -- original behavior, 13.3 fixed point coords, max range +-4096
float MSG_ReadCoord16 (void)
{
	return MSG_ReadShort() * (1.0/8);
}

//johnfitz -- 16.8 fixed point coords, max range +-32768
float MSG_ReadCoord24 (void)
{
	return MSG_ReadShort() + MSG_ReadByte() * (1.0/255);
}

//johnfitz -- 32-bit float coords
float MSG_ReadCoord32f (void)
{
	return MSG_ReadFloat();
}

float MSG_ReadCoord (void)
{
	return MSG_ReadCoord16();
}

float MSG_ReadAngle (void)
{
	return MSG_ReadChar() * (360.0/256);
}

//johnfitz -- for PROTOCOL_FITZQUAKE
float MSG_ReadAngle16 (void)
{
	return MSG_ReadShort() * (360.0 / 65536);
}
//johnfitz



//===========================================================================

void SZ_Alloc (sizebuf_t *buf, int startsize)
{
	if (startsize < 256)
		startsize = 256;
	buf->data = (byte *) Hunk_AllocName (startsize, "sizebuf");
	buf->maxsize = startsize;
	buf->cursize = 0;
}


void SZ_Free (sizebuf_t *buf)
{
//      Z_Free (buf->data);
//      buf->data = NULL;
//      buf->maxsize = 0;
	buf->cursize = 0;
}

void SZ_Clear (sizebuf_t *buf)
{
	buf->cursize = 0;
}

void *SZ_GetSpace (sizebuf_t *buf, int length)
{
	void    *data;

	if (buf->cursize + length > buf->maxsize)
	{
		if (!buf->allowoverflow)
			Sys_Error ("SZ_GetSpace: overflow without allowoverflow set");

		if (length > buf->maxsize)
			Sys_Error ("SZ_GetSpace: %i is > full buffer size", length);

		buf->overflowed = true;
		Con_Printf ("SZ_GetSpace: overflow");
		SZ_Clear (buf);
	}

	data = buf->data + buf->cursize;
	buf->cursize += length;

	return data;
}

void SZ_Write (sizebuf_t *buf, const void *data, int length)
{
	Q_memcpy (SZ_GetSpace(buf,length),data,length);
}

void SZ_Print (sizebuf_t *buf, const char *data)
{
	int             len;

	len = Q_strlen(data)+1;

// byte * cast to keep VC++ happy
	if (buf->data[buf->cursize-1])
		Q_memcpy ((byte *)SZ_GetSpace(buf, len),data,len); // no trailing 0
	else
		Q_memcpy ((byte *)SZ_GetSpace(buf, len-1)-1,data,len); // write over trailing 0
}


//============================================================================


/*
============
COM_SkipPath
============
*/
const char *COM_SkipPath (const char *pathname)
{
	const char *last;

	last = pathname;
	while (*pathname)
	{
		if (*pathname=='/')
			last = pathname+1;
		pathname++;
	}
	return last;
}

/*
============
COM_StripExtension
============
*/
void COM_StripExtension (const char *in, char *out)
{
	while (*in && *in != '.')
		*out++ = *in++;
	*out = 0;
}

/*
============
COM_FileExtension
============
*/
const char *COM_FileExtension (const char *in)
{
	static char exten[8];
	int             i;

	while (*in && *in != '.')
		in++;
	if (!*in)
		return "";
	in++;
	for (i=0 ; i<7 && *in ; i++,in++)
		exten[i] = *in;
	exten[i] = 0;
	return exten;
}

/*
============
COM_FileBase
============
*/
void COM_FileBase (const char *in, char *out)
{
	const char *s, *s2;

	s = in + strlen(in) - 1;

	while (s != in && *s != '.')
		s--;

	for (s2 = s ; s2 != in && *s2 && *s2 != '/' ; s2--)
	;

	if (s-s2 < 2)
		strcpy (out,"?model?");
	else
	{
		s--;
		strncpy (out,s2+1, s-s2);
		out[s-s2] = 0;
	}
}


/*
==================
COM_DefaultExtension
==================
*/
void COM_DefaultExtension (char *path, const char *extension)
{
	char    *src;
//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
	src = path + strlen(path) - 1;

	while (*src != '/' && src != path)
	{
		if (*src == '.')
			return;                 // it has an extension
		src--;
	}

	strcat (path, extension);
}


/*
==============
COM_Parse

Parse a token out of a string
==============
*/
const char *COM_Parse (const char *data)
{
	int             c;
	int             len;

	len = 0;
	com_token[0] = 0;

	if (!data)
		return NULL;

// skip whitespace
skipwhite:
	while ( (c = *data) <= ' ')
	{
		if (c == 0)
			return NULL;                    // end of file;
		data++;
	}

// skip // comments
	if (c=='/' && data[1] == '/')
	{
		while (*data && *data != '\n')
			data++;
		goto skipwhite;
	}


// handle quoted strings specially
	if (c == '\"')
	{
		data++;
		while (1)
		{
			c = *data++;
			if (c=='\"' || !c)
			{
				com_token[len] = 0;
				return data;
			}
			com_token[len] = c;
			len++;
		}
	}

// parse single characters
	if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
	{
		com_token[len] = c;
		len++;
		com_token[len] = 0;
		return data+1;
	}

// parse a regular word
	do
	{
		com_token[len] = c;
		data++;
		len++;
		c = *data;
		/* commented out the check for ':' so that ip:port works */
		if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' /* || c==':' */)
			break;
	} while (c>32);

	com_token[len] = 0;
	return data;
}


/*
================
COM_CheckParm

Returns the position (1 to argc-1) in the program's argument list
where the given parameter apears, or 0 if not present
================
*/
int COM_CheckParm (const char *parm)
{
	int             i;

	for (i=1 ; i<com_argc ; i++)
	{
		if (!com_argv[i])
			continue;               // NEXTSTEP sometimes clears appkit vars.
		if (!Q_strcmp (parm,com_argv[i]))
			return i;
	}

	return 0;
}

/*
================
COM_CheckRegistered

Looks for the pop.txt file and verifies it.
Sets the "registered" cvar.
Immediately exits out if an alternate game was attempted to be started without
being registered.
================
*/
void COM_CheckRegistered (void)
{
	int             h;
	unsigned short  check[128];
	int                     i;

	COM_OpenFile("gfx/pop.lmp", &h);
	static_registered = 0;

	if (h == -1)
	{
#if WINDED
	Sys_Error ("This dedicated server requires a full registered copy of Quake");
#endif
		Con_Printf ("Playing shareware version.\n");
		if (com_modified)
			Sys_Error ("You must have the registered version to use modified games");
		return;
	}

	Sys_FileRead (h, check, sizeof(check));
	COM_CloseFile (h);

	for (i=0 ; i<128 ; i++)
		if (pop[i] != (unsigned short)BigShort (check[i]))
			Sys_Error ("Corrupted data file.");

	Cvar_Set ("cmdline", com_cmdline+1); //johnfitz -- eliminate leading space
	Cvar_Set ("registered", "1");
	static_registered = 1;
	Con_Printf ("Playing registered version.\n");
}


void COM_Path_f (void);


/*
================
COM_InitArgv
================
*/
void COM_InitArgv (int argc, char **argv)
{
	int             i, j, n;

// reconstitute the command line for the cmdline externally visible cvar
	n = 0;

	for (j=0 ; (j<MAX_NUM_ARGVS) && (j< argc) ; j++)
	{
		i = 0;

		while ((n < (CMDLINE_LENGTH - 1)) && argv[j][i])
		{
			com_cmdline[n++] = argv[j][i++];
		}

		if (n < (CMDLINE_LENGTH - 1))
			com_cmdline[n++] = ' ';
		else
			break;
	}

	if (n > 0 && com_cmdline[n-1] == ' ')
		com_cmdline[n-1] = 0; //johnfitz -- kill the trailing space

	Con_Printf("Command line: %s\n", com_cmdline);

	for (com_argc=0 ; (com_argc<MAX_NUM_ARGVS) && (com_argc < argc) ; com_argc++)
	{
		largv[com_argc] = argv[com_argc];
		if (!Q_strcmp ("-safe", argv[com_argc]))
			safemode = 1;
	}

	largv[com_argc] = argvdummy;
	com_argv = largv;

	if (COM_CheckParm ("-rogue"))
	{
		rogue = true;
		standard_quake = false;
	}

	if (COM_CheckParm ("-hipnotic") || COM_CheckParm ("-quoth")) //johnfitz -- "-quoth" support
	{
		hipnotic = true;
		standard_quake = false;
	}
}

/*
================
Test_f -- johnfitz
================
*/
#ifdef _DEBUG
static void FitzTest_f (void)
{
}
#endif

/*
================
COM_Init
================
*/
void COM_Init (const char *basedir)
{
	int	i = 0x12345678;
		/*    U N I X */

	/*
	BE_ORDER:  12 34 56 78
		   U  N  I  X

	LE_ORDER:  78 56 34 12
		   X  I  N  U

	PDP_ORDER: 34 12 78 56
		   N  U  X  I
	*/
	if ( *(char *)&i == 0x12 )
		bigendien = true;
	else if ( *(char *)&i == 0x78 )
		bigendien = false;
	else /* if ( *(char *)&i == 0x34 ) */
		Sys_Error ("Unsupported endianism.");

	if (bigendien == false)
	{
		BigShort = ShortSwap;
		LittleShort = ShortNoSwap;
		BigLong = LongSwap;
		LittleLong = LongNoSwap;
		BigFloat = FloatSwap;
		LittleFloat = FloatNoSwap;
	}
	else /* we are big endian: */
	{
		BigShort = ShortNoSwap;
		LittleShort = ShortSwap;
		BigLong = LongNoSwap;
		LittleLong = LongSwap;
		BigFloat = FloatNoSwap;
		LittleFloat = FloatSwap;
	}

	if (COM_CheckParm("-fitz"))
		fitzmode = true;

	Cvar_RegisterVariable (&registered, NULL);
	Cvar_RegisterVariable (&cmdline, NULL);
	Cmd_AddCommand ("path", COM_Path_f);
	COM_InitFilesystem ();
	COM_CheckRegistered ();

#ifdef _DEBUG
	Cmd_AddCommand ("fitztest", FitzTest_f); //johnfitz
#endif
}


/*
============
va

does a varargs printf into a temp buffer. cycles between
4 different static buffers. the number of buffers cycled
is defined in VA_NUM_BUFFS.
FIXME: make this buffer size safe someday
============
*/
#define	VA_NUM_BUFFS	4
#define	VA_BUFFERLEN	1024

static char *get_va_buffer(void)
{
	static char va_buffers[VA_NUM_BUFFS][VA_BUFFERLEN];
	static int buffer_idx = 0;
	buffer_idx = (buffer_idx + 1) & (VA_NUM_BUFFS - 1);
	return va_buffers[buffer_idx];
}

char *va (const char *format, ...)
{
	va_list		argptr;
	char		*va_buf;

	va_buf = get_va_buffer ();
	va_start (argptr, format);
	q_vsnprintf (va_buf, VA_BUFFERLEN, format, argptr);
	va_end (argptr);

	return va_buf;
}


/// just for debugging
int     memsearch (byte *start, int count, int search)
{
	int             i;

	for (i=0 ; i<count ; i++)
		if (start[i] == search)
			return i;
	return -1;
}

/*
=============================================================================

QUAKE FILESYSTEM

=============================================================================
*/

int     com_filesize;


//
// in memory
//

typedef struct
{
	char    name[MAX_QPATH];
	int             filepos, filelen;
} packfile_t;

typedef struct pack_s
{
	char    filename[MAX_OSPATH];
	int             handle;
	int             numfiles;
	packfile_t      *files;
} pack_t;

//
// on disk
//
typedef struct
{
	char    name[56];
	int             filepos, filelen;
} dpackfile_t;

typedef struct
{
	char    id[4];
	int             dirofs;
	int             dirlen;
} dpackheader_t;

#define MAX_FILES_IN_PACK       2048

char    com_gamedir[MAX_OSPATH];
char    com_basedir[MAX_OSPATH];

typedef struct searchpath_s
{
	char    filename[MAX_OSPATH];
	pack_t  *pack;          // only one of filename / pack will be used
	struct searchpath_s *next;
} searchpath_t;

searchpath_t    *com_searchpaths;

/*
============
COM_Path_f
============
*/
void COM_Path_f (void)
{
	searchpath_t    *s;

	Con_Printf ("Current search path:\n");
	for (s=com_searchpaths ; s ; s=s->next)
	{
		if (s->pack)
		{
			Con_Printf ("%s (%i files)\n", s->pack->filename, s->pack->numfiles);
		}
		else
			Con_Printf ("%s\n", s->filename);
	}
}

/*
============
COM_WriteFile

The filename will be prefixed by the current game directory
============
*/
void COM_WriteFile (const char *filename, const void *data, int len)
{
	int             handle;
	char    name[MAX_OSPATH];

	Sys_mkdir (com_gamedir); //johnfitz -- if we've switched to a nonexistant gamedir, create it now so we don't crash

	sprintf (name, "%s/%s", com_gamedir, filename);

	handle = Sys_FileOpenWrite (name);
	if (handle == -1)
	{
		Sys_Printf ("COM_WriteFile: failed on %s\n", name);
		return;
	}

	Sys_Printf ("COM_WriteFile: %s\n", name);
	Sys_FileWrite (handle, data, len);
	Sys_FileClose (handle);
}

/*
============
COM_CreatePath
============
*/
void    COM_CreatePath (char *path)
{
	char    *ofs;

	for (ofs = path+1 ; *ofs ; ofs++)
	{
		if (*ofs == '/')
		{       // create the directory
			*ofs = 0;
			Sys_mkdir (path);
			*ofs = '/';
		}
	}
}

/*
===========
COM_CopyFile

Copies a file over from the net to the local cache, creating any directories
needed.  This is for the convenience of developers using ISDN from home.
===========
*/
void COM_CopyFile (const char *netpath, const char *cachepath)
{
	int             in, out;
	int             remaining, count;
	char    buf[4096];

	remaining = Sys_FileOpenRead (netpath, &in);
	Q_strcpy (buf, cachepath);
	COM_CreatePath (buf);     // create directories up to the cache file
	out = Sys_FileOpenWrite (cachepath);

	while (remaining)
	{
		if (remaining < sizeof(buf))
			count = remaining;
		else
			count = sizeof(buf);
		Sys_FileRead (in, buf, count);
		Sys_FileWrite (out, buf, count);
		remaining -= count;
	}

	Sys_FileClose (in);
	Sys_FileClose (out);
}

/*
===========
COM_FindFile

Finds the file in the search path.
Sets com_filesize and one of handle or file
===========
*/
int COM_FindFile (const char *filename, int *handle, FILE **file)
{
	searchpath_t    *search;
	char            netpath[MAX_OSPATH];
	pack_t          *pak;
	int                     i;
	int              findtime;

	if (file && handle)
		Sys_Error ("COM_FindFile: both handle and file set");
	if (!file && !handle)
		Sys_Error ("COM_FindFile: neither handle or file set");

//
// search through the path, one element at a time
//
	search = com_searchpaths;
	if (proghack)
	{	// gross hack to use quake 1 progs with quake 2 maps
		if (!strcmp(filename, "progs.dat"))
			search = search->next;
	}

	for ( ; search ; search = search->next)
	{
	// is the element a pak file?
		if (search->pack)
		{
		// look through all the pak file elements
			pak = search->pack;
			for (i=0 ; i<pak->numfiles ; i++)
				if (!strcmp (pak->files[i].name, filename))
				{	// found it!
				//	Sys_Printf ("PackFile: %s : %s\n",pak->filename, filename);
					if (handle)
					{
						*handle = pak->handle;
						Sys_FileSeek (pak->handle, pak->files[i].filepos);
					}
					else
					{       // open a new file on the pakfile
						*file = fopen (pak->filename, "rb");
						if (*file)
							fseek (*file, pak->files[i].filepos, SEEK_SET);
					}
					com_filesize = pak->files[i].filelen;
					return com_filesize;
				}
		}
		else
		{
	// check a file in the directory tree
			if (!static_registered)
			{       // if not a registered version, don't ever go beyond base
				if ( strchr (filename, '/') || strchr (filename,'\\'))
					continue;
			}

			sprintf (netpath, "%s/%s",search->filename, filename);

			findtime = Sys_FileTime (netpath);
			if (findtime == -1)
				continue;

		//	Sys_Printf ("FindFile: %s\n",netpath);
			com_filesize = Sys_FileOpenRead (netpath, &i);
			if (handle)
				*handle = i;
			else
			{
				Sys_FileClose (i);
				*file = fopen (netpath, "rb");
			}
			return com_filesize;
		}

	}

	Con_DPrintf ("FindFile: can't find %s\n", filename);

	if (handle)
		*handle = -1;
	else
		*file = NULL;
	com_filesize = -1;
	return -1;
}


/*
===========
COM_OpenFile

filename never has a leading slash, but may contain directory walks
returns a handle and a length
it may actually be inside a pak file
===========
*/
int COM_OpenFile (const char *filename, int *handle)
{
	return COM_FindFile (filename, handle, NULL);
}

/*
===========
COM_FOpenFile

If the requested file is inside a packfile, a new FILE * will be opened
into the file.
===========
*/
int COM_FOpenFile (const char *filename, FILE **file)
{
	return COM_FindFile (filename, NULL, file);
}

/*
============
COM_CloseFile

If it is a pak file handle, don't really close it
============
*/
void COM_CloseFile (int h)
{
	searchpath_t    *s;

	for (s = com_searchpaths ; s ; s=s->next)
		if (s->pack && s->pack->handle == h)
			return;

	Sys_FileClose (h);
}


/*
============
COM_LoadFile

Filename are reletive to the quake directory.
Allways appends a 0 byte.
============
*/
cache_user_t *loadcache;
byte    *loadbuf;
int             loadsize;
byte *COM_LoadFile (const char *path, int usehunk)
{
	int             h;
	byte    *buf;
	char    base[32];
	int             len;

	buf = NULL;     // quiet compiler warning

// look for it in the filesystem or pack files
	len = COM_OpenFile (path, &h);
	if (h == -1)
		return NULL;

// extract the filename base name for hunk tag
	COM_FileBase (path, base);

	if (usehunk == 1)
		buf = (byte *) Hunk_AllocName (len+1, base);
	else if (usehunk == 2)
		buf = (byte *) Hunk_TempAlloc (len+1);
	else if (usehunk == 0)
		buf = (byte *) Z_Malloc (len+1);
	else if (usehunk == 3)
		buf = (byte *) Cache_Alloc (loadcache, len+1, base);
	else if (usehunk == 4)
	{
		if (len+1 > loadsize)
			buf = (byte *) Hunk_TempAlloc (len+1);
		else
			buf = loadbuf;
	}
	else
		Sys_Error ("COM_LoadFile: bad usehunk");

	if (!buf)
		Sys_Error ("COM_LoadFile: not enough space for %s", path);

	((byte *)buf)[len] = 0;

	// Draw_BeginDisc causes core dumps when called excessively in big mods S.A.
	// Draw_BeginDisc ();

	Sys_FileRead (h, buf, len);
	COM_CloseFile (h);

	return buf;
}

byte *COM_LoadHunkFile (const char *path)
{
	return COM_LoadFile (path, 1);
}

byte *COM_LoadTempFile (const char *path)
{
	return COM_LoadFile (path, 2);
}

void COM_LoadCacheFile (const char *path, struct cache_user_s *cu)
{
	loadcache = cu;
	COM_LoadFile (path, 3);
}

// uses temp hunk if larger than bufsize
byte *COM_LoadStackFile (const char *path, void *buffer, int bufsize)
{
	byte    *buf;

	loadbuf = (byte *)buffer;
	loadsize = bufsize;
	buf = COM_LoadFile (path, 4);

	return buf;
}

/*
=================
COM_LoadPackFile -- johnfitz -- modified based on topaz's tutorial

Takes an explicit (not game tree related) path to a pak file.

Loads the header and directory, adding the files at the beginning
of the list so they override previous pack files.
=================
*/
pack_t *COM_LoadPackFile (const char *packfile)
{
	dpackheader_t   header;
	int                             i;
	packfile_t              *newfiles;
	int                             numpackfiles;
	pack_t                  *pack;
	int                             packhandle;
	dpackfile_t             info[MAX_FILES_IN_PACK];
	unsigned short          crc;

	if (Sys_FileOpenRead (packfile, &packhandle) == -1)
		return NULL;
	Sys_FileRead (packhandle, (void *)&header, sizeof(header));
	if (header.id[0] != 'P' || header.id[1] != 'A' || header.id[2] != 'C' || header.id[3] != 'K')
		Sys_Error ("%s is not a packfile", packfile);
	header.dirofs = LittleLong (header.dirofs);
	header.dirlen = LittleLong (header.dirlen);

	numpackfiles = header.dirlen / sizeof(dpackfile_t);

	if (numpackfiles > MAX_FILES_IN_PACK)
		Sys_Error ("%s has %i files", packfile, numpackfiles);

	if (numpackfiles != PAK0_COUNT)
		com_modified = true;    // not the original file

	//johnfitz -- dynamic gamedir loading
	//Hunk_AllocName (numpackfiles * sizeof(packfile_t), "packfile");
	newfiles = (packfile_t *) Z_Malloc(numpackfiles * sizeof(packfile_t));
	//johnfitz

	Sys_FileSeek (packhandle, header.dirofs);
	Sys_FileRead (packhandle, (void *)info, header.dirlen);

	// crc the directory to check for modifications
	CRC_Init (&crc);
	for (i = 0; i < header.dirlen ; i++)
		CRC_ProcessByte (&crc, ((byte *)info)[i]);
	if (crc != PAK0_CRC)
		com_modified = true;

	// parse the directory
	for (i = 0; i < numpackfiles ; i++)
	{
		strcpy (newfiles[i].name, info[i].name);
		newfiles[i].filepos = LittleLong(info[i].filepos);
		newfiles[i].filelen = LittleLong(info[i].filelen);
	}

	//johnfitz -- dynamic gamedir loading
	//pack = Hunk_Alloc (sizeof (pack_t));
	pack = (pack_t *) Z_Malloc (sizeof (pack_t));
	//johnfitz

	strcpy (pack->filename, packfile);
	pack->handle = packhandle;
	pack->numfiles = numpackfiles;
	pack->files = newfiles;

	//Con_Printf ("Added packfile %s (%i files)\n", packfile, numpackfiles);
	return pack;
}

/*
=================
COM_AddGameDirectory -- johnfitz -- modified based on topaz's tutorial
=================
*/
void COM_AddGameDirectory (const char *dir)
{
	int i;
	searchpath_t *search;
	pack_t *pak;
	char pakfile[MAX_OSPATH];

	strcpy (com_gamedir, dir);

	// add the directory to the search path
	search = (searchpath_t *) Z_Malloc(sizeof(searchpath_t));
	strcpy (search->filename, dir);
	search->next = com_searchpaths;
	com_searchpaths = search;

	// add any pak files in the format pak0.pak pak1.pak, ...
	for (i = 0; ; i++)
	{
		sprintf (pakfile, "%s/pak%i.pak", dir, i);
		pak = COM_LoadPackFile (pakfile);
		if (!pak)
			break;
		search = (searchpath_t *) Z_Malloc(sizeof(searchpath_t));
		search->pack = pak;
		search->next = com_searchpaths;
		com_searchpaths = search;
	}
}

static void kill_id1_conback (void)  /* QuakeSpasm customization: */
{
	searchpath_t	*search;
	int			i;

	for (search = com_searchpaths; search; search = search->next)
	{
		if (!search->pack)
			continue;
		if (!strstr(search->pack->filename, "/id1/pak0.pak"))
			continue;
		for (i = 0 ; i < search->pack->numfiles ; i++)
		{
			if (strcmp(search->pack->files[i].name,
					"gfx/conback.lmp") == 0)
			{
				search->pack->files[i].name[0] = '$';
				return;
			}
		}
	}
}

/*
=================
COM_InitFilesystem
=================
*/
void COM_InitFilesystem (void) //johnfitz -- modified based on topaz's tutorial
{
	int i, j;
	searchpath_t *search;

	i = COM_CheckParm ("-basedir");
	if (i && i < com_argc-1)
		strcpy (com_basedir, com_argv[i + 1]);
	else
		strcpy (com_basedir, host_parms.basedir);

	j = strlen (com_basedir);
	if (j > 0)
	{
		if ((com_basedir[j-1] == '\\') || (com_basedir[j-1] == '/'))
			com_basedir[j-1] = 0;
	}

	// start up with GAMENAME by default (id1)
	COM_AddGameDirectory (va("%s/"GAMENAME, com_basedir));
	strcpy (com_gamedir, va("%s/"GAMENAME, com_basedir));

	if (!fitzmode)
	{ /* QuakeSpasm customization: */
		kill_id1_conback ();
	}

	//johnfitz -- track number of mission packs added
	//since we don't want to allow the "game" command to strip them away
	com_nummissionpacks = 0;
	if (COM_CheckParm ("-rogue"))
	{
		COM_AddGameDirectory (va("%s/rogue", com_basedir));
		com_nummissionpacks++;
	}
	if (COM_CheckParm ("-hipnotic"))
	{
		COM_AddGameDirectory (va("%s/hipnotic", com_basedir));
		com_nummissionpacks++;
	}
	if (COM_CheckParm ("-quoth"))
	{
		COM_AddGameDirectory (va("%s/quoth", com_basedir));
		com_nummissionpacks++;
	}
	//johnfitz

	i = COM_CheckParm ("-game");
	if (i && i < com_argc-1)
	{
		com_modified = true;
		COM_AddGameDirectory (va("%s/%s", com_basedir, com_argv[i + 1]));
	}

	i = COM_CheckParm ("-path");
	if (i)
	{
		com_modified = true;
		com_searchpaths = NULL;
		while (++i < com_argc)
		{
			if (!com_argv[i] || com_argv[i][0] == '+' || com_argv[i][0] == '-')
				break;
			search = (searchpath_t *) Hunk_Alloc (sizeof(searchpath_t));
			if (!strcmp(COM_FileExtension(com_argv[i]), "pak") )
			{
				search->pack = COM_LoadPackFile (com_argv[i]);
				if (!search->pack)
					Sys_Error ("Couldn't load packfile: %s", com_argv[i]);
			}
			else
				strcpy (search->filename, com_argv[i]);
			search->next = com_searchpaths;
			com_searchpaths = search;
		}
	}

	if (COM_CheckParm ("-proghack"))
		proghack = true;
}