q_shwin.c

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/*
Copyright (C) 1997-2001 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.
 
*/
 
#include "../qcommon/qcommon.h"
#include "winquake.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <direct.h>
#include <io.h>
#include <conio.h>
 
//===============================================================================
 
int     hunkcount;
 
 
byte    *membase;
int     hunkmaxsize;
int     cursize;
 
#define VIRTUAL_ALLOC
 
void *Hunk_Begin (int maxsize)
{
    // reserve a huge chunk of memory, but don't commit any yet
    cursize = 0;
    hunkmaxsize = maxsize;
#ifdef VIRTUAL_ALLOC
    membase = VirtualAlloc (NULL, maxsize, MEM_RESERVE, PAGE_NOACCESS);
#else
    membase = malloc (maxsize);
    memset (membase, 0, maxsize);
#endif
    if (!membase)
        Sys_Error ("VirtualAlloc reserve failed");
    return (void *)membase;
}
 
void *Hunk_Alloc (int size)
{
    void    *buf;
 
    // round to cacheline
    size = (size+31)&~31;
 
#ifdef VIRTUAL_ALLOC
    // commit pages as needed
//  buf = VirtualAlloc (membase+cursize, size, MEM_COMMIT, PAGE_READWRITE);
    buf = VirtualAlloc (membase, cursize+size, MEM_COMMIT, PAGE_READWRITE);
    if (!buf)
    {
        FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &buf, 0, NULL);
        Sys_Error ("VirtualAlloc commit failed.\n%s", buf);
    }
#endif
    cursize += size;
    if (cursize > hunkmaxsize)
        Sys_Error ("Hunk_Alloc overflow");
 
    return (void *)(membase+cursize-size);
}
 
int Hunk_End (void)
{
 
    // free the remaining unused virtual memory
#if 0
    void    *buf;
 
    // write protect it
    buf = VirtualAlloc (membase, cursize, MEM_COMMIT, PAGE_READONLY);
    if (!buf)
        Sys_Error ("VirtualAlloc commit failed");
#endif
 
    hunkcount++;
//Com_Printf ("hunkcount: %i\n", hunkcount);
    return cursize;
}
 
void Hunk_Free (void *base)
{
    if ( base )
#ifdef VIRTUAL_ALLOC
        VirtualFree (base, 0, MEM_RELEASE);
#else
        free (base);
#endif
 
    hunkcount--;
}
 
//===============================================================================
 
 
/*
================
Sys_Milliseconds
================
*/
int curtime;
int Sys_Milliseconds (void)
{
    static int      base;
    static qboolean initialized = false;
 
    if (!initialized)
    {   // let base retain 16 bits of effectively random data
        base = timeGetTime() & 0xffff0000;
        initialized = true;
    }
    curtime = timeGetTime() - base;
 
    return curtime;
}
 
void Sys_Mkdir (char *path)
{
    _mkdir (path);
}
 
//============================================
 
char    findbase[MAX_OSPATH];
char    findpath[MAX_OSPATH];
intptr_t    findhandle;
 
static qboolean CompareAttributes( unsigned found, unsigned musthave, unsigned canthave )
{
    if ( ( found & _A_RDONLY ) && ( canthave & SFF_RDONLY ) )
        return false;
    if ( ( found & _A_HIDDEN ) && ( canthave & SFF_HIDDEN ) )
        return false;
    if ( ( found & _A_SYSTEM ) && ( canthave & SFF_SYSTEM ) )
        return false;
    if ( ( found & _A_SUBDIR ) && ( canthave & SFF_SUBDIR ) )
        return false;
    if ( ( found & _A_ARCH ) && ( canthave & SFF_ARCH ) )
        return false;
 
    if ( ( musthave & SFF_RDONLY ) && !( found & _A_RDONLY ) )
        return false;
    if ( ( musthave & SFF_HIDDEN ) && !( found & _A_HIDDEN ) )
        return false;
    if ( ( musthave & SFF_SYSTEM ) && !( found & _A_SYSTEM ) )
        return false;
    if ( ( musthave & SFF_SUBDIR ) && !( found & _A_SUBDIR ) )
        return false;
    if ( ( musthave & SFF_ARCH ) && !( found & _A_ARCH ) )
        return false;
 
    return true;
}
 
char *Sys_FindFirst (char *path, unsigned musthave, unsigned canthave )
{
    struct _finddata_t findinfo;
 
    if (findhandle)
        Sys_Error ("Sys_BeginFind without close");
    findhandle = 0;
 
    COM_FilePath (path, findbase);
    findhandle = _findfirst (path, &findinfo);
    if (findhandle == -1)
        return NULL;
    if ( !CompareAttributes( findinfo.attrib, musthave, canthave ) )
        return NULL;
    Com_sprintf (findpath, sizeof(findpath), "%s/%s", findbase, findinfo.name);
    return findpath;
}
 
char *Sys_FindNext ( unsigned musthave, unsigned canthave )
{
    struct _finddata_t findinfo;
 
    if (findhandle == -1)
        return NULL;
    if (_findnext (findhandle, &findinfo) == -1)
        return NULL;
    if ( !CompareAttributes( findinfo.attrib, musthave, canthave ) )
        return NULL;
 
    Com_sprintf (findpath, sizeof(findpath), "%s/%s", findbase, findinfo.name);
    return findpath;
}
 
void Sys_FindClose (void)
{
    if (findhandle != -1)
        _findclose (findhandle);
    findhandle = 0;
}
 
 
//============================================