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 } 197