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/* $OpenBSD: save.c,v 1.10 2014/12/08 21:56:27 deraadt Exp $ */
/* $NetBSD: save.c,v 1.2 1995/03/21 12:05:08 cgd Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* The game adventure was originally written in Fortran by Will Crowther
* and Don Woods. It was later translated to C and enhanced by Jim
* Gillogly. This code is derived from software contributed to Berkeley
* by Jim Gillogly at The Rand Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include "hdr.h"
#include "extern.h"
struct savestruct
{
void *address;
int width;
};
struct savestruct save_array[] =
{
{&abbnum, sizeof(abbnum)},
{&attack, sizeof(attack)},
{&blklin, sizeof(blklin)},
{&bonus, sizeof(bonus)},
{&chloc, sizeof(chloc)},
{&chloc2, sizeof(chloc2)},
{&clock1, sizeof(clock1)},
{&clock2, sizeof(clock2)},
{&closed, sizeof(closed)},
{&closng, sizeof(closng)},
{&daltlc, sizeof(daltlc)},
{&demo, sizeof(demo)},
{&detail, sizeof(detail)},
{&dflag, sizeof(dflag)},
{&dkill, sizeof(dkill)},
{&dtotal, sizeof(dtotal)},
{&foobar, sizeof(foobar)},
{&gaveup, sizeof(gaveup)},
{&holdng, sizeof(holdng)},
{&iwest, sizeof(iwest)},
{&k, sizeof(k)},
{&k2, sizeof(k2)},
{&knfloc, sizeof(knfloc)},
{&kq, sizeof(kq)},
{&latncy, sizeof(latncy)},
{&limit, sizeof(limit)},
{&lmwarn, sizeof(lmwarn)},
{&loc, sizeof(loc)},
{&maxdie, sizeof(maxdie)},
{&mxscor, sizeof(mxscor)},
{&newloc, sizeof(newloc)},
{&numdie, sizeof(numdie)},
{&obj, sizeof(obj)},
{&oldlc2, sizeof(oldlc2)},
{&oldloc, sizeof(oldloc)},
{&panic, sizeof(panic)},
{&savet, sizeof(savet)},
{&scorng, sizeof(scorng)},
{&spk, sizeof(spk)},
{&stick, sizeof(stick)},
{&tally, sizeof(tally)},
{&tally2, sizeof(tally2)},
{&tkk, sizeof(tkk)},
{&turns, sizeof(turns)},
{&verb, sizeof(verb)},
{&wd1, sizeof(wd1)},
{&wd2, sizeof(wd2)},
{&wzdark, sizeof(wzdark)},
{&yea, sizeof(yea)},
{atloc, sizeof(atloc)},
{dloc, sizeof(dloc)},
{dseen, sizeof(dseen)},
{fixed, sizeof(fixed)},
{hinted, sizeof(hinted)},
{linkx, sizeof(linkx)},
{odloc, sizeof(odloc)},
{place, sizeof(place)},
{prop, sizeof(prop)},
{tk, sizeof(tk)},
{NULL, 0}
};
/*
* Two passes on data: first to get checksum, second
* to output the data using checksum to start random #s
*/
int
save(const char *outfile)
{
FILE *out;
struct savestruct *p;
char *s;
long sum;
int i;
crc_start();
for (p = save_array; p->address != NULL; p++)
sum = crc(p->address, p->width);
srandom_deterministic((int) sum);
if ((out = fopen(outfile, "wb")) == NULL) {
fprintf(stderr,
"Hmm. The name \"%s\" appears to be magically blocked.\n",
outfile);
return 1;
}
fwrite(&sum, sizeof(sum), 1, out); /* Here's the random() key */
for (p = save_array; p->address != NULL; p++) {
for (s = p->address, i = 0; i < p->width; i++, s++)
*s = (*s ^ random()) & 0xFF; /* Slightly obfuscate */
fwrite(p->address, p->width, 1, out);
}
fclose(out);
return 0;
}
int
restore(const char *infile)
{
FILE *in;
struct savestruct *p;
char *s;
long sum, cksum;
int i;
if ((in = fopen(infile, "rb")) == NULL) {
fprintf(stderr,
"Hmm. The file \"%s\" appears to be magically blocked.\n",
infile);
return 1;
}
fread(&sum, sizeof(sum), 1, in); /* Get the seed */
srandom_deterministic((unsigned int) sum);
for (p = save_array; p->address != NULL; p++) {
fread(p->address, p->width, 1, in);
for (s = p->address, i = 0; i < p->width; i++, s++)
*s = (*s ^ random()) & 0xFF; /* deobfuscate */
}
fclose(in);
crc_start(); /* See if she cheated */
for (p = save_array; p->address != NULL; p++)
cksum = crc(p->address, p->width);
if (sum != cksum) /* Tsk tsk */
return 2; /* Altered the file */
/* We successfully restored, so this really was a save file */
/* Get rid of the file, but don't bother checking that we did */
return 0;
}
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