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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
39 #ifndef lint
40 static char sccsid[] = "@(#)save.c      8.1 (Berkeley) 5/31/93";
41 #endif /* not lint */
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 save(outfile)   /* Two passes on data: first to get checksum, second */
121 const char *outfile;  /* to output the data using checksum to start random #s */
122 {
123         FILE *out;
124         struct savestruct *p;
125         char *s;
126         long sum;
127         int i;
128
129         crc_start();
130         for (p = save_array; p->address != NULL; p++)
131                 sum = crc(p->address, p->width);
132         srandom((int) sum);
133
134         if ((out = fopen(outfile, "wb")) == NULL)
135         {
136             fprintf(stderr,
137                 "Hmm.  The name \"%s\" appears to be magically blocked.\n",
138                 outfile);
139             return 1;
140         }
141
142         fwrite(&sum, sizeof(sum), 1, out);      /* Here's the random() key */
143         for (p = save_array; p->address != NULL; p++)
144         {
145                 for (s = p->address, i = 0; i < p->width; i++, s++)
146                         *s = (*s ^ random()) & 0xFF;      /* Lightly encrypt */
147                 fwrite(p->address, p->width, 1, out);
148         }
149         fclose(out);
150         return 0;
151 }
152
153 restore(infile)
154 const char *infile;
155 {
156         FILE *in;
157         struct savestruct *p;
158         char *s;
159         long sum, cksum;
160         int i;
161
162         if ((in = fopen(infile, "rb")) == NULL)
163         {
164             fprintf(stderr,
165                 "Hmm.  The file \"%s\" appears to be magically blocked.\n",
166                 infile);
167             return 1;
168         }
169
170         fread(&sum, sizeof(sum), 1, in);        /* Get the seed */
171         srandom((int) sum);
172         for (p = save_array; p->address != NULL; p++)
173         {
174                 fread(p->address, p->width, 1, in);
175                 for (s = p->address, i = 0; i < p->width; i++, s++)
176                         *s = (*s ^ random()) & 0xFF;  /* Lightly decrypt */
177         }
178         fclose(in);
179
180         crc_start();                            /* See if she cheated */
181         for (p = save_array; p->address != NULL; p++)
182                 cksum = crc(p->address, p->width);
183         if (sum != cksum)                       /* Tsk tsk */
184             return 2;                           /* Altered the file */
185         /* We successfully restored, so this really was a save file */
186         /* Get rid of the file, but don't bother checking that we did */
187         return 0;
188 }