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 } 192