games/adventure/save.c

   1 /*      $NetBSD: save.c,v 1.10 2009/08/12 04:28:27 dholland Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * The game adventure was originally written in Fortran by Will Crowther
   8  * and Don Woods.  It was later translated to C and enhanced by Jim
   9  * Gillogly.  This code is derived from software contributed to Berkeley
  10  * by Jim Gillogly at The Rand Corporation.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)save.c      8.1 (Berkeley) 5/31/93";
  41 #else
  42 __RCSID("$NetBSD: save.c,v 1.10 2009/08/12 04:28:27 dholland Exp $");
  43 #endif
  44 #endif                          /* not lint */
  45
  46 #include <err.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include "hdr.h"
  50 #include "extern.h"
  51
  52 struct savestruct {
  53         void   *address;
  54         int     width;
  55 };
  56
  57 static const struct savestruct save_array[] =
  58 {
  59         {&abbnum, sizeof(abbnum)},
  60         {&attack, sizeof(attack)},
  61         {&blklin, sizeof(blklin)},
  62         {&bonus, sizeof(bonus)},
  63         {&chloc, sizeof(chloc)},
  64         {&chloc2, sizeof(chloc2)},
  65         {&clock1, sizeof(clock1)},
  66         {&clock2, sizeof(clock2)},
  67         {&closed, sizeof(closed)},
  68         {&isclosing, sizeof(isclosing)},
  69         {&daltloc, sizeof(daltloc)},
  70         {&demo, sizeof(demo)},
  71         {&detail, sizeof(detail)},
  72         {&dflag, sizeof(dflag)},
  73         {&dkill, sizeof(dkill)},
  74         {&dtotal, sizeof(dtotal)},
  75         {&foobar, sizeof(foobar)},
  76         {&gaveup, sizeof(gaveup)},
  77         {&holding, sizeof(holding)},
  78         {&iwest, sizeof(iwest)},
  79         {&k, sizeof(k)},
  80         {&k2, sizeof(k2)},
  81         {&knfloc, sizeof(knfloc)},
  82         {&kq, sizeof(kq)},
  83         {&latency, sizeof(latency)},
  84         {&limit, sizeof(limit)},
  85         {&lmwarn, sizeof(lmwarn)},
  86         {&loc, sizeof(loc)},
  87         {&maxdie, sizeof(maxdie)},
  88         {&maxscore, sizeof(maxscore)},
  89         {&newloc, sizeof(newloc)},
  90         {&numdie, sizeof(numdie)},
  91         {&obj, sizeof(obj)},
  92         {&oldloc2, sizeof(oldloc2)},
  93         {&oldloc, sizeof(oldloc)},
  94         {&panic, sizeof(panic)},
  95         {&saveday, sizeof(saveday)},
  96         {&savet, sizeof(savet)},
  97         {&scoring, sizeof(scoring)},
  98         {&spk, sizeof(spk)},
  99         {&stick, sizeof(stick)},
 100         {&tally, sizeof(tally)},
 101         {&tally2, sizeof(tally2)},
 102         {&tkk, sizeof(tkk)},
 103         {&turns, sizeof(turns)},
 104         {&verb, sizeof(verb)},
 105         {&wd1, sizeof(wd1)},
 106         {&wd2, sizeof(wd2)},
 107         {&wasdark, sizeof(wasdark)},
 108         {&yea, sizeof(yea)},
 109         {atloc, sizeof(atloc)},
 110         {dloc, sizeof(dloc)},
 111         {dseen, sizeof(dseen)},
 112         {fixed, sizeof(fixed)},
 113         {hinted, sizeof(hinted)},
 114         {links, sizeof(links)},
 115         {odloc, sizeof(odloc)},
 116         {place, sizeof(place)},
 117         {prop, sizeof(prop)},
 118         {tk, sizeof(tk)},
 119
 120         {NULL, 0}
 121 };
 122
 123 /* Two passes on data: first to get checksum, second */
 124 /* to output the data using checksum to start random #s */
 125 int
 126 save(const char *outfile)
 127 {
 128         FILE   *out;
 129         const struct savestruct *p;
 130         char   *s;
 131         long    sum;
 132         int     i;
 133
 134         crc_start();
 135         for (p = save_array; p->address != NULL; p++)
 136                 sum = crc(p->address, p->width);
 137         srandom((int) sum);
 138
 139         if ((out = fopen(outfile, "wb")) == NULL) {
 140                 fprintf(stderr,
 141                     "Hmm.  The name \"%s\" appears to be magically blocked.\n",
 142                     outfile);
 143                 return 1;
 144         }
 145         fwrite(&sum, sizeof(sum), 1, out);      /* Here's the random() key */
 146         for (p = save_array; p->address != NULL; p++) {
 147                 for (s = p->address, i = 0; i < p->width; i++, s++)
 148                         *s = (*s ^ random()) & 0xFF;    /* Lightly encrypt */
 149                 fwrite(p->address, p->width, 1, out);
 150         }
 151         if (fclose(out) != 0) {
 152                 warn("writing %s", outfile);
 153                 return 1;
 154         }
 155         return 0;
 156 }
 157
 158 int
 159 restore(const char *infile)
 160 {
 161         FILE   *in;
 162         const struct savestruct *p;
 163         char   *s;
 164         long    sum, cksum = 0;
 165         int     i;
 166
 167         if ((in = fopen(infile, "rb")) == NULL) {
 168                 fprintf(stderr,
 169                     "Hmm.  The file \"%s\" appears to be magically blocked.\n",
 170                     infile);
 171                 return 1;
 172         }
 173         fread(&sum, sizeof(sum), 1, in);        /* Get the seed */
 174         srandom((int) sum);
 175         for (p = save_array; p->address != NULL; p++) {
 176                 fread(p->address, p->width, 1, in);
 177                 for (s = p->address, i = 0; i < p->width; i++, s++)
 178                         *s = (*s ^ random()) & 0xFF;    /* Lightly decrypt */
 179         }
 180         fclose(in);
 181
 182         crc_start();            /* See if she cheated */
 183         for (p = save_array; p->address != NULL; p++)
 184                 cksum = crc(p->address, p->width);
 185         if (sum != cksum)       /* Tsk tsk */
 186                 return 2;       /* Altered the file */
 187         /* We successfully restored, so this really was a save file */
 188         /* Get rid of the file, but don't bother checking that we did */
 189         return 0;
 190 }