1 /* $NetBSD: save.c,v 1.11 2009/08/25 06:56:52 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 1.11 2009/08/25 06:56:52 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 } 191