1 /* $OpenBSD: save.c,v 1.12 2017/01/21 08:22:57 krw Exp $ */ 2 /* $NetBSD: save.c,v 1.2 1995/03/21 12:05:08 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * The game adventure was originally written in Fortran by Will Crowther 9 * and Don Woods. It was later translated to C and enhanced by Jim 10 * Gillogly. This code is derived from software contributed to Berkeley 11 * by Jim Gillogly at The Rand Corporation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 41 #include "extern.h" 42 #include "hdr.h" 43 44 struct savestruct 45 { 46 void *address; 47 int width; 48 }; 49 50 struct savestruct save_array[] = 51 { 52 {&abbnum, sizeof(abbnum)}, 53 {&attack, sizeof(attack)}, 54 {&blklin, sizeof(blklin)}, 55 {&bonus, sizeof(bonus)}, 56 {&chloc, sizeof(chloc)}, 57 {&chloc2, sizeof(chloc2)}, 58 {&clock1, sizeof(clock1)}, 59 {&clock2, sizeof(clock2)}, 60 {&closed, sizeof(closed)}, 61 {&closng, sizeof(closng)}, 62 {&daltlc, sizeof(daltlc)}, 63 {&demo, sizeof(demo)}, 64 {&detail, sizeof(detail)}, 65 {&dflag, sizeof(dflag)}, 66 {&dkill, sizeof(dkill)}, 67 {&dtotal, sizeof(dtotal)}, 68 {&foobar, sizeof(foobar)}, 69 {&gaveup, sizeof(gaveup)}, 70 {&holdng, sizeof(holdng)}, 71 {&iwest, sizeof(iwest)}, 72 {&k, sizeof(k)}, 73 {&k2, sizeof(k2)}, 74 {&knfloc, sizeof(knfloc)}, 75 {&kq, sizeof(kq)}, 76 {&latncy, sizeof(latncy)}, 77 {&limit, sizeof(limit)}, 78 {&lmwarn, sizeof(lmwarn)}, 79 {&loc, sizeof(loc)}, 80 {&maxdie, sizeof(maxdie)}, 81 {&mxscor, sizeof(mxscor)}, 82 {&newloc, sizeof(newloc)}, 83 {&numdie, sizeof(numdie)}, 84 {&obj, sizeof(obj)}, 85 {&oldlc2, sizeof(oldlc2)}, 86 {&oldloc, sizeof(oldloc)}, 87 {&panic, sizeof(panic)}, 88 {&savet, sizeof(savet)}, 89 {&scorng, sizeof(scorng)}, 90 {&spk, sizeof(spk)}, 91 {&stick, sizeof(stick)}, 92 {&tally, sizeof(tally)}, 93 {&tally2, sizeof(tally2)}, 94 {&tkk, sizeof(tkk)}, 95 {&turns, sizeof(turns)}, 96 {&verb, sizeof(verb)}, 97 {&wd1, sizeof(wd1)}, 98 {&wd2, sizeof(wd2)}, 99 {&wzdark, sizeof(wzdark)}, 100 {&yea, sizeof(yea)}, 101 {atloc, sizeof(atloc)}, 102 {dloc, sizeof(dloc)}, 103 {dseen, sizeof(dseen)}, 104 {fixed, sizeof(fixed)}, 105 {hinted, sizeof(hinted)}, 106 {linkx, sizeof(linkx)}, 107 {odloc, sizeof(odloc)}, 108 {place, sizeof(place)}, 109 {prop, sizeof(prop)}, 110 {tk, sizeof(tk)}, 111 112 {NULL, 0} 113 }; 114 115 /* 116 * Two passes on data: first to get checksum, second 117 * to output the data using checksum to start random #s 118 */ 119 int 120 save(const char *outfile) 121 { 122 FILE *out; 123 struct savestruct *p; 124 char *s; 125 long sum; 126 int i; 127 128 crc_start(); 129 for (p = save_array; p->address != NULL; p++) 130 sum = crc(p->address, p->width); 131 srandom_deterministic((int) sum); 132 133 if ((out = fopen(outfile, "wb")) == NULL) { 134 fprintf(stderr, 135 "Hmm. The name \"%s\" appears to be magically blocked.\n", 136 outfile); 137 return 1; 138 } 139 140 fwrite(&sum, sizeof(sum), 1, out); /* Here's the random() key */ 141 for (p = save_array; p->address != NULL; p++) { 142 for (s = p->address, i = 0; i < p->width; i++, s++) 143 *s = (*s ^ random()) & 0xFF; /* Slightly obfuscate */ 144 fwrite(p->address, p->width, 1, out); 145 } 146 fclose(out); 147 return 0; 148 } 149 150 int 151 restore(const char *infile) 152 { 153 FILE *in; 154 struct savestruct *p; 155 char *s; 156 long sum, cksum; 157 int i; 158 159 if ((in = fopen(infile, "rb")) == NULL) { 160 fprintf(stderr, 161 "Hmm. The file \"%s\" appears to be magically blocked.\n", 162 infile); 163 return 1; 164 } 165 166 fread(&sum, sizeof(sum), 1, in); /* Get the seed */ 167 srandom_deterministic((unsigned int) sum); 168 for (p = save_array; p->address != NULL; p++) { 169 fread(p->address, p->width, 1, in); 170 for (s = p->address, i = 0; i < p->width; i++, s++) 171 *s = (*s ^ random()) & 0xFF; /* deobfuscate */ 172 } 173 fclose(in); 174 175 crc_start(); /* See if she cheated */ 176 for (p = save_array; p->address != NULL; p++) 177 cksum = crc(p->address, p->width); 178 if (sum != cksum) /* Tsk tsk */ 179 return 2; /* Altered the file */ 180 /* We successfully restored, so this really was a save file */ 181 /* Get rid of the file, but don't bother checking that we did */ 182 return 0; 183 } 184