/*
Copyright (C) 1996-1997 Id Software, 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 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"

#define NUM_SAFE_ARGVS  7

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

static char     *safeargvs[NUM_SAFE_ARGVS] =
{"-stdvid", "-nolan", "-nosound", "-nocdaudio", "-nojoy", "-nomouse", "-dibonly"};

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

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

qboolean		proghack;

//int             static_registered = 1;  // only for startup check, then set // removing pop.lmp check - removed

qboolean		msg_suppress_1 = 0;

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
char	com_cmdline[CMDLINE_LENGTH];

qboolean		standard_quake = true, rogue, hipnotic;

/* // removing pop.lmp check - removed - begin
// 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
};
*/ // removing pop.lmp check - removed - end

/*


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

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

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

    if ((((long)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, void *src, int count)
{
    int             i;

    if ((((long)dest | (long)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(void *m1, void *m2, int count)
{
    while (count) {
        count--;
        if (((byte *)m1)[count] != ((byte *)m2)[count]) {
            return -1;
        }
    }
    return 0;
}

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

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

int Q_strlen(char *str)
{
    int             count;

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

    return count;
}

char *Q_strrchr(char *s, char c)
{
    int len = Q_strlen(s);
    s += len;
    while (len--)
        if (*--s == c) {
            return s;
        }
    return 0;
}

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

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

    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 != c2) {
                return -1;    // strings not equal
            }
        }
        if (!c1) {
            return 0;    // strings are equal
        }
//              s1++;
//              s2++;
    }

    return -1;
}

int Q_strcasecmp(char *s1, char *s2)
{
// 2001-10-25 Q_strcasecmp fix by Maddes  start
//	return Q_strncasecmp (s1, s2, 99999);
    int	len1, len2;

    len1 = strlen(s1);
    len2 = strlen(s2);
    if (len2 > len1) {
        len1 = len2;
    }

    return Q_strncasecmp(s1, s2, len1);
// 2001-10-25 Q_strcasecmp fix by Maddes  end
}

int Q_atoi(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(char *str)
{
    double			val;
    int             sign;
    int             c;
    int             decimal, total;

// 1999-12-27 ATOF problems with leading spaces fix by Maddes  start
    while ((*str) && (*str<=' ')) {
        str++;
    }
// 1999-12-27 ATOF problems with leading spaces fix by Maddes  end
    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 = 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 = 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 = SZ_GetSpace(sb, 2);
    buf[0] = c&0xff;
    buf[1] = c>>8;
}

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

    buf = 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, char *s)
{
    if (!s) {
        SZ_Write(sb, "", 1);
    } else {
        SZ_Write(sb, s, Q_strlen(s)+1);
    }
}

void MSG_WriteCoord(sizebuf_t *sb, float f)
{
    MSG_WriteShort(sb, (int)(f*8));
}

extern int current_protocol; // 16-bit angles
void MSG_WriteAngle(sizebuf_t *sb, float f)
{
    // 16-bit angles - begin
    if (current_protocol == QB_PROTOCOL) {
        MSG_WriteShort(sb, (int)(f*65536.0/360.0) & 65535);    // MSG_WriteFloat(sb, f);
    } else
        // 16-bit angles - end
    {
        MSG_WriteByte(sb, (int)(f*256.0/360.0) & 255);    // improved 8-bit angles - edited
    }
}

//
// 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;
}

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;
}

float MSG_ReadCoord(void)
{
    return MSG_ReadShort() * (1.0/8);
}

float MSG_ReadAngle(void)
{
    // 16-bit angles - begin
    if (current_protocol == QB_PROTOCOL) {
        return MSG_ReadShort() * (360.0/65536.0);    //MSG_ReadFloat();
    } else
        // 16-bit angles - end
    {
        return MSG_ReadChar() * (360.0/256.0);
    }
}



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

void SZ_Alloc(sizebuf_t *buf, int startsize)
{
    if (startsize < 256) {
        startsize = 256;
    }
    buf->data = 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, void *data, int length)
{
    Q_memcpy(SZ_GetSpace(buf,length),data,length);
}

void SZ_Print(sizebuf_t *buf, 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
============
*/
char *COM_SkipPath(char *pathname)
{
    char    *last;

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

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

/*
============
COM_FileExtension
============
*/
char *COM_FileExtension(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(char *in, char *out)
{
    char *s, *s2;

    s = in + strlen(in) - 1;

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

    for (s2 = s ; *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, 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
==============
*/
char *COM_Parse(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;
        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(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;

    Cvar_Set("cmdline", com_cmdline);
    Cvar_Set("registered", "1");
}


void COM_Path_f(void);


/*
================
COM_InitArgv
================
*/
void COM_InitArgv(int argc, char **argv)
{
    qboolean        safe;
    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;
        }
    }

    com_cmdline[n] = 0;

    safe = false;

    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])) {
            safe = true;
        }
    }

    if (safe) {
        // force all the safe-mode switches. Note that we reserved extra space in
        // case we need to add these, so we don't need an overflow check
        for (i=0 ; i<NUM_SAFE_ARGVS ; i++) {
            largv[com_argc] = safeargvs[i];
            com_argc++;
        }
    }

    largv[com_argc] = argvdummy;
    com_argv = largv;

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

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


/*
================
COM_Init
================
*/
void COM_Init(char *basedir)
{
    byte    swaptest[2] = {1,0};

// set the byte swapping variables in a portable manner
    if (*(short *)swaptest == 1) {
        bigendien = false;
        BigShort = ShortSwap;
        LittleShort = ShortNoSwap;
        BigLong = LongSwap;
        LittleLong = LongNoSwap;
        BigFloat = FloatSwap;
        LittleFloat = FloatNoSwap;
    } else {
        bigendien = true;
        BigShort = ShortNoSwap;
        LittleShort = ShortSwap;
        BigLong = LongNoSwap;
        LittleLong = LongSwap;
        BigFloat = FloatNoSwap;
        LittleFloat = FloatSwap;
    }

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

    COM_InitFilesystem();
    COM_CheckRegistered();
}


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

does a varargs printf into a temp buffer, so I don't need to have
varargs versions of all text functions.
FIXME: make this buffer size safe someday
============
*/
char    *va(char *format, ...)
{
    va_list         argptr;
    static char             string[1024];

    va_start(argptr, format);
    vsprintf(string, format,argptr);
    va_end(argptr);

    return string;
}


/// 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
//
/* // 2001-09-12 Returning from which searchpath a file was loaded by Maddes
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
*/ // 2001-09-12 Returning from which searchpath a file was loaded by Maddes
char    com_cachedir[MAX_OSPATH];
char    com_gamedir[MAX_OSPATH];
/* // 2001-09-12 Returning from which searchpath a file was loaded by Maddes
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;
*/ // 2001-09-12 Returning from which searchpath a file was loaded by Maddes
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(char *filename, void *data, int len)
{
    int             handle;
    char    name[MAX_OSPATH];

    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

Only used for CopyFile
============
*/
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(char *netpath, char *cachepath)
{
    int             in, out;
    int             remaining, count;
    char    buf[4096];

    remaining = Sys_FileOpenRead(netpath, &in);
    COM_CreatePath(cachepath);      // 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(char *filename, int *handle, FILE **file, searchpath_t **foundpath)	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
{
    searchpath_t    *search;
    char            netpath[MAX_OSPATH];
    char            cachepath[MAX_OSPATH];
    pack_t          *pak;
    int                     i;
    int                     findtime, cachetime;

    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 (!Q_strcasecmp(pak->files[i].name, filename)) { // fixed
                    // 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);
                        }
                    }
// 2001-09-12 Returning from which searchpath a file was loaded by Maddes  start
                    if (foundpath) {
                        *foundpath = search;
                    }
// 2001-09-12 Returning from which searchpath a file was loaded by Maddes  end
                    com_filesize = pak->files[i].filelen;
                    return com_filesize;
                }
        } else {
            // check a file in the directory tree
            /* // removing pop.lmp check - removed - begin
            if (!static_registered)
            {       // if not a registered version, don't ever go beyond base
            	if ( strchr (filename, '/') || strchr (filename,'\\'))
            		continue;
            }
            */ // removing pop.lmp check - removed - end

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

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

            // see if the file needs to be updated in the cache
            if (!com_cachedir[0]) {
                strcpy(cachepath, netpath);
            } else {
#if defined(_WIN32)
                if ((strlen(netpath) < 2) || (netpath[1] != ':')) {
                    sprintf(cachepath,"%s%s", com_cachedir, netpath);
                } else {
                    sprintf(cachepath,"%s%s", com_cachedir, netpath+2);
                }
#else
                sprintf(cachepath,"%s%s", com_cachedir, netpath);
#endif

                cachetime = Sys_FileTime(cachepath);

                if (cachetime < findtime) {
                    COM_CopyFile(netpath, cachepath);
                }
                strcpy(netpath, cachepath);
            }

            Sys_Printf("FindFile: %s\n",netpath);
            com_filesize = Sys_FileOpenRead(netpath, &i);
            if (handle) {
                *handle = i;
            } else {
                Sys_FileClose(i);
                *file = fopen(netpath, "rb");
            }
// 2001-09-12 Returning from which searchpath a file was loaded by Maddes  start
            if (foundpath) {
                *foundpath = search;
            }
// 2001-09-12 Returning from which searchpath a file was loaded by Maddes  end
            return com_filesize;
        }

    }

    Sys_Printf("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(char *filename, int *handle, searchpath_t **foundpath)	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
{
    return COM_FindFile(filename, handle, NULL, foundpath);	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
}

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

If the requested file is inside a packfile, a new FILE * will be opened
into the file.
===========
*/
int COM_FOpenFile(char *filename, FILE **file, searchpath_t **foundpath)	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
{
    return COM_FindFile(filename, NULL, file, foundpath);	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
}

/*
============
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;
// 2001-09-12 Returning information about loaded file by Maddes  start
//byte *COM_LoadFile (char *path, int usehunk)
loadedfile_t *COM_LoadFile(char *path, int usehunk)
// 2001-09-12 Returning information about loaded file by Maddes  end
{
    int             h;
    byte    *buf;
    char    base[32];
    int             len;
// 2001-09-12 Returning information about loaded file by Maddes  start
    int		bufsize;
    loadedfile_t	*fileinfo;
    searchpath_t	*foundpath;	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
// 2001-09-12 Returning information about loaded file by Maddes  end

    buf = NULL;     // quiet compiler warning

// look for it in the filesystem or pack files
    len = COM_OpenFile(path, &h, &foundpath);	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
    if (h == -1) {
        return NULL;
    }

    bufsize = ((len+1+3)&~3) + sizeof(struct loadedfile_s);	// 2001-09-12 Returning information about loaded file by Maddes

// extract the filename base name for hunk tag
// 2001-12-28 Use full filename for hunk allocation by Maddes  start
//	COM_FileBase (path, base);
    strncpy(base, COM_SkipPath(path), sizeof(base));
    base[sizeof(base)-1] = 0;
// 2001-12-28 Use full filename for hunk allocation by Maddes  end

    if (usehunk == 1)
// 2001-09-12 Returning information about loaded file by Maddes  start
//		buf = Hunk_AllocName (len+1, base);
    {
        buf = Hunk_AllocName(bufsize, base);
    }
// 2001-09-12 Returning information about loaded file by Maddes  end
    else if (usehunk == 2)
// 2001-09-12 Returning information about loaded file by Maddes  start
//		buf = Hunk_TempAlloc (len+1);
    {
        buf = Hunk_TempAlloc(bufsize);
    }
// 2001-09-12 Returning information about loaded file by Maddes  end
    else if (usehunk == 0)
// 2001-09-12 Returning information about loaded file by Maddes  start
//		buf = Z_Malloc (len+1);
    {
        buf = Z_Malloc(bufsize);
    }
// 2001-09-12 Returning information about loaded file by Maddes  end
    else if (usehunk == 3)
// 2001-09-12 Returning information about loaded file by Maddes  start
//		buf = Cache_Alloc (loadcache, len+1, base);
    {
        buf = Cache_Alloc(loadcache, bufsize, base);
    }
// 2001-09-12 Returning information about loaded file by Maddes  end
    else if (usehunk == 4) {
// 2001-09-12 Returning information about loaded file by Maddes  start
        /*
        		if (len+1 > loadsize)
        			buf = Hunk_TempAlloc (len+1);
        */
        if (bufsize > loadsize) {
            buf = Hunk_TempAlloc(bufsize);
        }
// 2001-09-12 Returning information about loaded file by Maddes  end
        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;
// 2001-09-12 Returning information about loaded file by Maddes  start
    fileinfo = (loadedfile_t *)(buf + ((len+1+3)&~3));
    fileinfo->data = buf;
    fileinfo->filelen = len;
    fileinfo->path = foundpath;	// 2001-09-12 Returning from which searchpath a file was loaded by Maddes
// 2001-09-12 Returning information about loaded file by Maddes  end

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

// 2001-09-12 Returning information about loaded file by Maddes  start
//	return buf;
    return fileinfo;
// 2001-09-12 Returning information about loaded file by Maddes  end
}

// 2001-09-12 Returning information about loaded file by Maddes  start
//byte *COM_LoadHunkFile (char *path)
loadedfile_t *COM_LoadHunkFile(char *path)
// 2001-09-12 Returning information about loaded file by Maddes  end
{
    return COM_LoadFile(path, 1);
}

// 2001-09-12 Returning information about loaded file by Maddes  start
//byte *COM_LoadTempFile (char *path)
loadedfile_t *COM_LoadTempFile(char *path)
// 2001-09-12 Returning information about loaded file by Maddes  end
{
    return COM_LoadFile(path, 2);
}

// 2001-09-12 Returning information about loaded file by Maddes  start
//void COM_LoadCacheFile (char *path, struct cache_user_s *cu)
loadedfile_t *COM_LoadCacheFile(char *path, struct cache_user_s *cu)
// 2001-09-12 Returning information about loaded file by Maddes  end
{
    loadcache = cu;
    return COM_LoadFile(path, 3);	// 2001-09-12 Returning information about loaded file by Maddes
}

// uses temp hunk if larger than bufsize
// 2001-09-12 Returning information about loaded file by Maddes  start
//byte *COM_LoadStackFile (char *path, void *buffer, int bufsize)
loadedfile_t *COM_LoadStackFile(char *path, void *buffer, int bufsize)
// 2001-09-12 Returning information about loaded file by Maddes  end
{
//	byte	*buf;	// 2001-09-12 Returning information about loaded file by Maddes

    loadbuf = (byte *)buffer;
    loadsize = bufsize;
// 2001-09-12 Returning information about loaded file by Maddes  start
    /*
    	buf = COM_LoadFile (path, 4);

    	return buf;
    */
    return COM_LoadFile(path, 4);
// 2001-09-12 Returning information about loaded file by Maddes  end
}

/*
=================
COM_LoadPackFile

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(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) {
//              Con_Printf ("Couldn't open %s\n", packfile);
        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
    }

    newfiles = Hunk_AllocName(numpackfiles * sizeof(packfile_t), "packfile");

    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);
    }

    pack = Hunk_Alloc(sizeof(pack_t));
    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

Sets com_gamedir, adds the directory to the head of the path,
then loads and adds pak1.pak pak2.pak ...
================
*/
void COM_AddGameDirectory(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 = Hunk_Alloc(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<64 ; i++) { // edited
        sprintf(pakfile, "%s/pak%i.pak", dir, i);
        pak = COM_LoadPackFile(pakfile);
        if (!pak) {
            continue;    //break; // edited
        }
        search = Hunk_Alloc(sizeof(searchpath_t));
        strcpy(search->filename, dir);	// 2001-09-12 Finding the last searchpath of a directory by Maddes
        search->pack = pak;
        search->next = com_searchpaths;
        com_searchpaths = search;
    }

//
// add the contents of the parms.txt file to the end of the command line
//

}

// BlackAura (09/08/2004) - Return the full path to a file
// Returns 0 if file not found, 1 if file found
// Path is returned in *path
int COM_FindFilePath(char *filename, char *path)
{
    searchpath_t    *search;
    int findtime;

    if (!path) {
        Sys_Error("COM_FindFilePath: path not set");
    }

    // Run through the search path
    search = com_searchpaths;
    for (; search ; search = search->next) {
        // We can only operate on files
        if (!search->pack) {
            // check a file in the directory tree
            sprintf(path, "%s/%s",search->filename, filename);

            findtime = Sys_FileTime(path);
            if (findtime != -1) {
                return 1;
            }
        }
    }

    Sys_Printf("FindFile: can't find %s\n", filename);
    return 0;
}

/*
================
COM_InitFilesystem
================
*/
void COM_InitFilesystem(void)
{
    int             i, j;
    char    basedir[MAX_OSPATH];
    searchpath_t    *search;

//
// -basedir <path>
// Overrides the system supplied base directory (under GAMENAME)
//
    i = COM_CheckParm("-basedir");
    if (i && i < com_argc-1) {
        strcpy(basedir, com_argv[i+1]);
    } else {
        strcpy(basedir, host_parms.basedir);
    }

    j = strlen(basedir);

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

//
// -cachedir <path>
// Overrides the system supplied cache directory (NULL or /qcache)
// -cachedir - will disable caching.
//
    i = COM_CheckParm("-cachedir");
    if (i && i < com_argc-1) {
        if (com_argv[i+1][0] == '-') {
            com_cachedir[0] = 0;
        } else {
            strcpy(com_cachedir, com_argv[i+1]);
        }
    } else if (host_parms.cachedir) {
        strcpy(com_cachedir, host_parms.cachedir);
    } else {
        com_cachedir[0] = 0;
    }

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

    if (COM_CheckParm("-rogue")) {
        COM_AddGameDirectory(va("%s/rogue", basedir));
    }
    if (COM_CheckParm("-hipnotic")) {
        COM_AddGameDirectory(va("%s/hipnotic", basedir));
    }

//
// -game <gamedir>
// Adds basedir/gamedir as an override game
//
    i = COM_CheckParm("-game");
    if (i && i < com_argc-1) {
        com_modified = true;
        COM_AddGameDirectory(va("%s/%s", basedir, com_argv[i+1]));
    }
    // begin
    if (!Q_strcasecmp(com_argv[i+1], "rogue")) {
        rogue = true;
        standard_quake = false;
    }

    if (!Q_strcasecmp(com_argv[i+1], "hipnotic")) {
        hipnotic = true;
        standard_quake = false;
    }
    // end

//
// -path <dir or packfile> [<dir or packfile>] ...
// Fully specifies the exact serach path, overriding the generated one
//
    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 = 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;
    }
}


// 2001-09-12 Finding the last searchpath of a directory  start
/*
============
COM_GetDirSearchPath

Find the last searchpath entry of the same directory of the given searchpath
============
*/
searchpath_t *COM_GetDirSearchPath(searchpath_t *startsearch)
{
    searchpath_t *search, *lastsearch;

    lastsearch = startsearch;

    while ((search = lastsearch->next)) {
        if (strcmp(search->filename, startsearch->filename)) {	// different directories, then stop here
            break;
        }
        lastsearch = search;
    }

    return lastsearch;
}
// 2001-09-12 Finding the last searchpath of a directory  end
