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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * @(#)save.c   8.1 (Berkeley) 5/31/93
  39  * $FreeBSD: src/games/adventure/save.c,v 1.8 1999/12/19 00:21:51 billf Exp $
  40  * $DragonFly: src/games/adventure/save.c,v 1.3 2007/04/18 18:32:12 swildner Exp $
  41  */
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <sys/types.h>
  46 #include "hdr.h"
  47
  48 struct savestruct
  49 {
  50         void *address;
  51         int width;
  52 };
  53
  54 struct savestruct save_array[] =
  55 {
  56         {&abbnum,        sizeof(abbnum)},
  57         {&attack,        sizeof(attack)},
  58         {&blklin,        sizeof(blklin)},
  59         {&bonus,         sizeof(bonus)},
  60         {&chloc,         sizeof(chloc)},
  61         {&chloc2,        sizeof(chloc2)},
  62         {&clock1,        sizeof(clock1)},
  63         {&clock2,        sizeof(clock2)},
  64         {&closed,        sizeof(closed)},
  65         {&closng,        sizeof(closng)},
  66         {&daltlc,        sizeof(daltlc)},
  67         {&demo,          sizeof(demo)},
  68         {&detail,        sizeof(detail)},
  69         {&dflag,         sizeof(dflag)},
  70         {&dkill,         sizeof(dkill)},
  71         {&dtotal,        sizeof(dtotal)},
  72         {&foobar,        sizeof(foobar)},
  73         {&gaveup,        sizeof(gaveup)},
  74         {&holdng,        sizeof(holdng)},
  75         {&iwest,         sizeof(iwest)},
  76         {&k,             sizeof(k)},
  77         {&k2,            sizeof(k2)},
  78         {&knfloc,        sizeof(knfloc)},
  79         {&kq,            sizeof(kq)},
  80         {&latncy,        sizeof(latncy)},
  81         {&limit,         sizeof(limit)},
  82         {&lmwarn,        sizeof(lmwarn)},
  83         {&loc,           sizeof(loc)},
  84         {&maxdie,        sizeof(maxdie)},
  85         {&mxscor,        sizeof(mxscor)},
  86         {&newloc,        sizeof(newloc)},
  87         {&numdie,        sizeof(numdie)},
  88         {&obj,           sizeof(obj)},
  89         {&oldlc2,        sizeof(oldlc2)},
  90         {&oldloc,        sizeof(oldloc)},
  91         {&panic,         sizeof(panic)},
  92         {&saved,         sizeof(saved)},
  93         {&savet,         sizeof(savet)},
  94         {&scorng,        sizeof(scorng)},
  95         {&spk,           sizeof(spk)},
  96         {&stick,         sizeof(stick)},
  97         {&tally,         sizeof(tally)},
  98         {&tally2,        sizeof(tally2)},
  99         {&tkk,           sizeof(tkk)},
 100         {&turns,         sizeof(turns)},
 101         {&verb,          sizeof(verb)},
 102         {&wd1,           sizeof(wd1)},
 103         {&wd2,           sizeof(wd2)},
 104         {&wzdark,        sizeof(wzdark)},
 105         {&yea,           sizeof(yea)},
 106         {atloc,          sizeof(atloc)},
 107         {dloc,           sizeof(dloc)},
 108         {dseen,          sizeof(dseen)},
 109         {fixed,          sizeof(fixed)},
 110         {hinted,         sizeof(hinted)},
 111         {linkx,           sizeof(linkx)},
 112         {odloc,          sizeof(odloc)},
 113         {place,          sizeof(place)},
 114         {prop,           sizeof(prop)},
 115         {tk,             sizeof(tk)},
 116
 117         {NULL,   0}
 118 };
 119
 120 /* Two passes on data: first to get checksum, second */
 121 /* to output the data using checksum to start random #s */
 122 int
 123 save(const char *outfile)
 124 {
 125         FILE *out;
 126         struct savestruct *p;
 127         char *s;
 128         long sum;
 129         int i;
 130
 131         crc_start();
 132         for (p = save_array; p->address != NULL; p++)
 133                 sum = crc(p->address, p->width);
 134         srandom((int) sum);
 135
 136         if ((out = fopen(outfile, "wb")) == NULL)
 137         {
 138             fprintf(stderr,
 139                 "Hmm.  The name \"%s\" appears to be magically blocked.\n",
 140                 outfile);
 141             return 1;
 142         }
 143
 144         fwrite(&sum, sizeof(sum), 1, out);      /* Here's the random() key */
 145         for (p = save_array; p->address != NULL; p++)
 146         {
 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         fclose(out);
 152         return 0;
 153 }
 154
 155 int
 156 restore(const char *infile)
 157 {
 158         FILE *in;
 159         struct savestruct *p;
 160         char *s;
 161         long sum, cksum;
 162         int i;
 163
 164         cksum = 0;
 165         if ((in = fopen(infile, "rb")) == NULL)
 166         {
 167             fprintf(stderr,
 168                 "Hmm.  The file \"%s\" appears to be magically blocked.\n",
 169                 infile);
 170             return 1;
 171         }
 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         {
 177                 fread(p->address, p->width, 1, in);
 178                 for (s = p->address, i = 0; i < p->width; i++, s++)
 179                         *s = (*s ^ random()) & 0xFF;  /* Lightly decrypt */
 180         }
 181         fclose(in);
 182
 183         crc_start();                            /* See if she cheated */
 184         for (p = save_array; p->address != NULL; p++)
 185                 cksum = crc(p->address, p->width);
 186         if (sum != cksum)                       /* Tsk tsk */
 187             return 2;                           /* Altered the file */
 188         /* We successfully restored, so this really was a save file */
 189         /* Get rid of the file, but don't bother checking that we did */
 190         return 0;
 191 }