adventure/save.c

   1 /*      $NetBSD: save.c,v 1.7 1999/07/17 20:02:48 hubertf 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. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #include <sys/cdefs.h>
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)save.c      8.1 (Berkeley) 5/31/93";
  45 #else
  46 __RCSID("$NetBSD: save.c,v 1.7 1999/07/17 20:02:48 hubertf Exp $");
  47 #endif
  48 #endif                          /* not lint */
  49
  50 #include <err.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include "hdr.h"
  54 #include "extern.h"
  55
  56 struct savestruct {
  57         void   *address;
  58         int     width;
  59 };
  60
  61 struct savestruct save_array[] =
  62 {
  63         {&abbnum, sizeof(abbnum)},
  64         {&attack, sizeof(attack)},
  65         {&blklin, sizeof(blklin)},
  66         {&bonus, sizeof(bonus)},
  67         {&chloc, sizeof(chloc)},
  68         {&chloc2, sizeof(chloc2)},
  69         {&clock1, sizeof(clock1)},
  70         {&clock2, sizeof(clock2)},
  71         {&closed, sizeof(closed)},
  72         {&closng, sizeof(closng)},
  73         {&daltlc, sizeof(daltlc)},
  74         {&demo, sizeof(demo)},
  75         {&detail, sizeof(detail)},
  76         {&dflag, sizeof(dflag)},
  77         {&dkill, sizeof(dkill)},
  78         {&dtotal, sizeof(dtotal)},
  79         {&foobar, sizeof(foobar)},
  80         {&gaveup, sizeof(gaveup)},
  81         {&holdng, sizeof(holdng)},
  82         {&iwest, sizeof(iwest)},
  83         {&k, sizeof(k)},
  84         {&k2, sizeof(k2)},
  85         {&knfloc, sizeof(knfloc)},
  86         {&kq, sizeof(kq)},
  87         {&latncy, sizeof(latncy)},
  88         {&limit, sizeof(limit)},
  89         {&lmwarn, sizeof(lmwarn)},
  90         {&loc, sizeof(loc)},
  91         {&maxdie, sizeof(maxdie)},
  92         {&mxscor, sizeof(mxscor)},
  93         {&newloc, sizeof(newloc)},
  94         {&numdie, sizeof(numdie)},
  95         {&obj, sizeof(obj)},
  96         {&oldlc2, sizeof(oldlc2)},
  97         {&oldloc, sizeof(oldloc)},
  98         {&panic, sizeof(panic)},
  99         {&saveday, sizeof(saveday)},
 100         {&savet, sizeof(savet)},
 101         {&scorng, sizeof(scorng)},
 102         {&spk, sizeof(spk)},
 103         {&stick, sizeof(stick)},
 104         {&tally, sizeof(tally)},
 105         {&tally2, sizeof(tally2)},
 106         {&tkk, sizeof(tkk)},
 107         {&turns, sizeof(turns)},
 108         {&verb, sizeof(verb)},
 109         {&wd1, sizeof(wd1)},
 110         {&wd2, sizeof(wd2)},
 111         {&wzdark, sizeof(wzdark)},
 112         {&yea, sizeof(yea)},
 113         {atloc, sizeof(atloc)},
 114         {dloc, sizeof(dloc)},
 115         {dseen, sizeof(dseen)},
 116         {fixed, sizeof(fixed)},
 117         {hinted, sizeof(hinted)},
 118         {links, sizeof(links)},
 119         {odloc, sizeof(odloc)},
 120         {place, sizeof(place)},
 121         {prop, sizeof(prop)},
 122         {tk, sizeof(tk)},
 123
 124         {NULL, 0}
 125 };
 126
 127 int
 128 save(outfile)                   /* Two passes on data: first to get checksum,
 129                                  * second */
 130         const char   *outfile;  /* to output the data using checksum to start
 131                                  * random #s */
 132 {
 133         FILE   *out;
 134         struct savestruct *p;
 135         char   *s;
 136         long    sum;
 137         int     i;
 138
 139         crc_start();
 140         for (p = save_array; p->address != NULL; p++)
 141                 sum = crc(p->address, p->width);
 142         srandom((int) sum);
 143
 144         if ((out = fopen(outfile, "wb")) == NULL) {
 145                 fprintf(stderr,
 146                     "Hmm.  The name \"%s\" appears to be magically blocked.\n",
 147                     outfile);
 148                 return 1;
 149         }
 150         fwrite(&sum, sizeof(sum), 1, out);      /* Here's the random() key */
 151         for (p = save_array; p->address != NULL; p++) {
 152                 for (s = p->address, i = 0; i < p->width; i++, s++)
 153                         *s = (*s ^ random()) & 0xFF;    /* Lightly encrypt */
 154                 fwrite(p->address, p->width, 1, out);
 155         }
 156         if (fclose(out) != 0) {
 157                 warn("writing %s", outfile);
 158                 return 1;
 159         }
 160         return 0;
 161 }
 162
 163 int
 164 restore(infile)
 165         const char   *infile;
 166 {
 167         FILE   *in;
 168         struct savestruct *p;
 169         char   *s;
 170         long    sum, cksum = 0;
 171         int     i;
 172
 173         if ((in = fopen(infile, "rb")) == NULL) {
 174                 fprintf(stderr,
 175                     "Hmm.  The file \"%s\" appears to be magically blocked.\n",
 176                     infile);
 177                 return 1;
 178         }
 179         fread(&sum, sizeof(sum), 1, in);        /* Get the seed */
 180         srandom((int) sum);
 181         for (p = save_array; p->address != NULL; p++) {
 182                 fread(p->address, p->width, 1, in);
 183                 for (s = p->address, i = 0; i < p->width; i++, s++)
 184                         *s = (*s ^ random()) & 0xFF;    /* Lightly decrypt */
 185         }
 186         fclose(in);
 187
 188         crc_start();            /* See if she cheated */
 189         for (p = save_array; p->address != NULL; p++)
 190                 cksum = crc(p->address, p->width);
 191         if (sum != cksum)       /* Tsk tsk */
 192                 return 2;       /* Altered the file */
 193         /* We successfully restored, so this really was a save file */
 194         /* Get rid of the file, but don't bother checking that we did */
 195         return 0;
 196 }