src/memory.c

   1 /*
   2    Copyright (C) Prikol Software 1996-1997
   3    Copyright (C) Aleksey Volynskov 1996-1997
   4
   5    This file is part of the Doom2D:Rembo project.
   6
   7    Doom2D:Rembo is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License version 2 as
   9    published by the Free Software Foundation.
  10
  11    Doom2D:Rembo is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/> or
  18    write to the Free Software Foundation, Inc.,
  19    51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20 */
  21
  22 #include "glob.h"
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include "error.h"
  27 #include "files.h"
  28 #include "memory.h"
  29
  30 dword dpmi_memavl(void);
  31
  32 extern int d_start,d_end;
  33
  34 extern mwad_t wad[];
  35
  36 static byte m_active=FALSE;
  37
  38 static void *resp[MAX_WAD];
  39 static short resl[MAX_WAD];
  40
  41 void M_startup(void) {
  42   if(m_active) return;
  43   logo("M_startup: настройка памяти\n");
  44   memset(resp,0,sizeof(resp));
  45   memset(resl,0,sizeof(resl));
  46   //  logo("  свободно DPMI-памяти: %uK\n",dpmi_memavl()>>10);
  47   m_active=TRUE;
  48 }
  49
  50 void M_shutdown(void) {
  51
  52   if(!m_active) return;
  53   m_active=FALSE;
  54 }
  55
  56 static void allocres(int h) {
  57   int *p,s;
  58
  59   if(h>d_start && h<d_end) s=1; else s=0;
  60   if(!(p=malloc(wad[h].l+4+s*8)))
  61     ERR_fatal("M_lock: не хватает памяти");
  62   *p=h;
  63   ++p;
  64   resp[h]=p;
  65   if(s) {
  66     p[0]=p[1]=p[2]=p[3]=0;
  67     F_loadres(h,p,0,2);
  68     F_loadres(h,p+1,2,2);
  69     F_loadres(h,p+2,4,2);
  70     F_loadres(h,p+3,6,2);
  71     F_loadres(h,p+4,8,wad[h].l-8);
  72   }else F_loadres(h,p,0,wad[h].l);
  73 }
  74
  75 void *M_lock(int h) {
  76   if(h==-1 || h==0xFFFF) return NULL;
  77   h&=-1-0x8000;
  78   if(h>=MAX_WAD) ERR_fatal("M_lock: странный номер ресурса");
  79   if(!resl[h]) if(!resp[h]) allocres(h);
  80   ++resl[h];
  81   return resp[h];
  82 }
  83
  84 void M_unlock(void *p) {
  85   int h;
  86
  87   if(!p) return;
  88   h=((int*)p)[-1];
  89   if(h>=MAX_WAD) ERR_fatal("M_unlock: странный номер ресурса");
  90   if(!resl[h]) return;
  91   --resl[h];
  92 }
  93
  94 int M_locked (int h) {
  95   return (h != -1) && (h != 0xFFFF) && (resl[h & (-1 - 0x8000)] != 0);
  96 }
  97
  98 int M_was_locked (int h) {
  99   return (h != -1) && (h != 0xFFFF) && (resp[h & (-1 - 0x8000)] != NULL);
 100 }