games/adventure/save.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * The game adventure was originally written in Fortran by Will Crowther
   6  * and Don Woods.  It was later translated to C and enhanced by Jim
   7  * Gillogly.  This code is derived from software contributed to Berkeley
   8  * by Jim Gillogly at The Rand Corporation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#)save.c   8.1 (Berkeley) 5/31/93
  35  * $FreeBSD: src/games/adventure/save.c,v 1.8 1999/12/19 00:21:51 billf Exp $
  36  * $DragonFly: src/games/adventure/save.c,v 1.3 2007/04/18 18:32:12 swildner Exp $
  37  */
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <sys/types.h>
  42 #include "hdr.h"
  43
  44 struct savestruct {
  45         void *address;
  46         int width;
  47 };
  48
  49 struct savestruct save_array[] =
  50 {
  51         {&abbnum, sizeof(abbnum)},
  52         {&attack, sizeof(attack)},
  53         {&blklin, sizeof(blklin)},
  54         {&bonus, sizeof(bonus)},
  55         {&chloc, sizeof(chloc)},
  56         {&chloc2, sizeof(chloc2)},
  57         {&clock1, sizeof(clock1)},
  58         {&clock2, sizeof(clock2)},
  59         {&closed, sizeof(closed)},
  60         {&closng, sizeof(closng)},
  61         {&daltlc, sizeof(daltlc)},
  62         {&demo, sizeof(demo)},
  63         {&detail, sizeof(detail)},
  64         {&dflag, sizeof(dflag)},
  65         {&dkill, sizeof(dkill)},
  66         {&dtotal, sizeof(dtotal)},
  67         {&foobar, sizeof(foobar)},
  68         {&gaveup, sizeof(gaveup)},
  69         {&holdng, sizeof(holdng)},
  70         {&iwest, sizeof(iwest)},
  71         {&k, sizeof(k)},
  72         {&k2, sizeof(k2)},
  73         {&knfloc, sizeof(knfloc)},
  74         {&kq, sizeof(kq)},
  75         {&latncy, sizeof(latncy)},
  76         {&limit, sizeof(limit)},
  77         {&lmwarn, sizeof(lmwarn)},
  78         {&loc, sizeof(loc)},
  79         {&maxdie, sizeof(maxdie)},
  80         {&mxscor, sizeof(mxscor)},
  81         {&newloc, sizeof(newloc)},
  82         {&numdie, sizeof(numdie)},
  83         {&obj, sizeof(obj)},
  84         {&oldlc2, sizeof(oldlc2)},
  85         {&oldloc, sizeof(oldloc)},
  86         {&panic, sizeof(panic)},
  87         {&saved, sizeof(saved)},
  88         {&savet, sizeof(savet)},
  89         {&scorng, sizeof(scorng)},
  90         {&spk, sizeof(spk)},
  91         {&stick, sizeof(stick)},
  92         {&tally, sizeof(tally)},
  93         {&tally2, sizeof(tally2)},
  94         {&tkk, sizeof(tkk)},
  95         {&turns, sizeof(turns)},
  96         {&verb, sizeof(verb)},
  97         {&wd1, sizeof(wd1)},
  98         {&wd2, sizeof(wd2)},
  99         {&wzdark, sizeof(wzdark)},
 100         {&yea, sizeof(yea)},
 101         {atloc, sizeof(atloc)},
 102         {dloc, sizeof(dloc)},
 103         {dseen, sizeof(dseen)},
 104         {fixed, sizeof(fixed)},
 105         {hinted, sizeof(hinted)},
 106         {linkx, sizeof(linkx)},
 107         {odloc, sizeof(odloc)},
 108         {place, sizeof(place)},
 109         {prop, sizeof(prop)},
 110         {tk, sizeof(tk)},
 111
 112         {NULL, 0}
 113 };
 114
 115 /*
 116  * Two passes on data: first to get checksum, second
 117  * to output the data using checksum to start random #s
 118  */
 119 int
 120 save(const char *outfile)
 121 {
 122         FILE *out;
 123         struct savestruct *p;
 124         char *s;
 125         long sum;
 126         int i;
 127
 128         crc_start();
 129         for (p = save_array; p->address != NULL; p++)
 130                 sum = crc(p->address, p->width);
 131         srandom(sum);
 132
 133         if ((out = fopen(outfile, "wb")) == NULL) {
 134                 fprintf(stderr,
 135                     "Hmm.  The name \"%s\" appears to be magically blocked.\n",
 136                     outfile);
 137                 return 1;
 138         }
 139         fwrite(&sum, sizeof(sum), 1, out);      /* Here's the random() key */
 140         for (p = save_array; p->address != NULL; p++) {
 141                 for (s = p->address, i = 0; i < p->width; i++, s++)
 142                         *s = (*s ^ random()) & 0xFF;    /* Lightly encrypt */
 143                 fwrite(p->address, p->width, 1, out);
 144         }
 145         fclose(out);
 146         return 0;
 147 }
 148
 149 int
 150 restore(const char *infile)
 151 {
 152         FILE *in;
 153         struct savestruct *p;
 154         char *s;
 155         long sum, cksum;
 156         int i;
 157
 158         cksum = 0;
 159         if ((in = fopen(infile, "rb")) == NULL) {
 160                 fprintf(stderr,
 161                     "Hmm.  The file \"%s\" appears to be magically blocked.\n",
 162                     infile);
 163                 return 1;
 164         }
 165         fread(&sum, sizeof(sum), 1, in);        /* Get the seed */
 166         srandom(sum);
 167         for (p = save_array; p->address != NULL; p++) {
 168                 fread(p->address, p->width, 1, in);
 169                 for (s = p->address, i = 0; i < p->width; i++, s++)
 170                         *s = (*s ^ random()) & 0xFF;    /* Lightly decrypt */
 171         }
 172         fclose(in);
 173
 174         crc_start();            /* See if she cheated */
 175         for (p = save_array; p->address != NULL; p++)
 176                 cksum = crc(p->address, p->width);
 177         if (sum != cksum)       /* Tsk tsk */
 178                 return 2;       /* Altered the file */
 179         /* We successfully restored, so this really was a save file */
 180         /* Get rid of the file, but don't bother checking that we did */
 181         return 0;
 182 }