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538 lines (475 loc) · 13.5 KB
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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#define TRUE 1
#define FALSE 0
/* The default locations of everything.
*/
#ifdef _WIN32
#define DIRSEP '\\'
#define DEFAULT_DATA_DIR ".\\data"
#define DEFAULT_SETS_DIR ".\\sets"
#define DEFAULT_SAVE_DIR ".\\save"
#else
#define DIRSEP '/'
#define DEFAULT_DATA_DIR "/usr/local/share/tworld/data"
#define DEFAULT_SETS_DIR "/usr/local/share/tworld/sets"
#define DEFAULT_SAVE_DIR "~/.tworld"
#endif
/* The various file signatures.
*/
static unsigned long const tws_sig = 0x999B3335;
static unsigned long const dat_sig = 0x0002AAAC;
static unsigned long const dac_sig = 0x656C6966;
/*
* General-purpose functions
*/
#define memerrexit() (warn("out of memory"), exit(EXIT_FAILURE))
#define xalloc(p, n) (((p) = realloc((p), (n))) || (memerrexit(), NULL))
typedef struct fileinfo {
char const *name;
FILE *fp;
} fileinfo;
static int warn(char const *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
fputc('\n', stderr);
va_end(args);
return FALSE;
}
static int warnfile(fileinfo const *file, char const *alt)
{
if (alt) {
if (errno)
warn("%s: %s", file->name, strerror(errno));
else
warn("%s: %s", file->name, alt);
}
return FALSE;
}
static int fileopen(fileinfo *file, char const *name, char const *mode,
char const *msg)
{
file->name = name;
file->fp = fopen(name, mode);
if (!file->fp)
return warnfile(file, msg);
return TRUE;
}
static int fileskip(fileinfo *file, int offset, char const *msg)
{
return fseek(file->fp, offset, SEEK_CUR) ? warnfile(file, msg) : TRUE;
}
static int fileread(fileinfo *file, void *buf, unsigned long size,
char const *msg)
{
return fread(buf, size, 1, file->fp) == 1 ? TRUE : warnfile(file, msg);
}
static int filereadint8(fileinfo *file, unsigned int *val, char const *msg)
{
int byte;
if ((byte = fgetc(file->fp)) != EOF) {
*val = (unsigned char)byte;
return TRUE;
}
return warnfile(file, msg);
}
static int filereadint16(fileinfo *file, unsigned int *val, char const *msg)
{
int byte;
if ((byte = fgetc(file->fp)) != EOF) {
*val = byte & 0xFFU;
if ((byte = fgetc(file->fp)) != EOF) {
*val |= (byte & 0xFFU) << 8;
return TRUE;
}
}
return warnfile(file, msg);
}
static int filereadint32(fileinfo *file, unsigned long *val, char const *msg)
{
int byte;
if ((byte = fgetc(file->fp)) != EOF) {
*val = byte & 0xFFUL;
if ((byte = fgetc(file->fp)) != EOF) {
*val |= (byte & 0xFFUL) << 8;
if ((byte = fgetc(file->fp)) != EOF) {
*val |= (byte & 0xFFUL) << 16;
if ((byte = fgetc(file->fp)) != EOF) {
*val |= (byte & 0xFFUL) << 24;
return TRUE;
}
}
}
}
return warnfile(file, msg);
}
static void fileclose(fileinfo *file, char const *msg)
{
if (fclose(file->fp))
warnfile(file, msg);
file->fp = NULL;
}
/*
* Functions for reading solution file data
*/
/* A single solution.
*/
typedef struct solution {
unsigned int number; /* level number */
unsigned char passwd[16]; /* level password */
unsigned long time; /* solution time */
unsigned long score; /* score for the level */
} solution;
/* A set of solutions.
*/
typedef struct solutions {
int count; /* total number of solutions */
solution *solutions; /* all the solutions */
int currentlevel; /* most recently visited level */
char setname[256]; /* the name of the data file */
} solutions;
/* Parse the given file and return a filled-in solutions struct.
*/
static int readsolutions(char const *infilename, solutions *ss)
{
fileinfo file;
solution *s;
unsigned long dword;
unsigned int word, byte;
ss->count = 0;
ss->solutions = NULL;
ss->currentlevel = 0;
*ss->setname = '\0';
if (!fileopen(&file, infilename, "rb", "couldn't open"))
return FALSE;
/* The first four bytes of a .tws file contain the signature.
*/
if (!filereadint32(&file, &dword, "not a solution file"))
return FALSE;
if (dword != tws_sig)
return warnfile(&file, "not a .tws file");
/* The next byte contains the ruleset.
*/
if (!filereadint8(&file, &byte, "not a solution file"))
return FALSE;
if (byte != 2)
warnfile(&file, "does not use the MS ruleset");
/* The next two bytes contain the current level number.
*/
if (!filereadint16(&file, &word, "not a solution file"))
return FALSE;
ss->currentlevel = word;
/* The next byte contains the size of the remaining header.
*/
if (!filereadint8(&file, &byte, "not a solution file"))
return FALSE;
if (byte)
if (!fileskip(&file, byte, "not a solution file"))
return FALSE;
/* After that come the individual solutions. The first four bytes
* of every solution is a number (little-endian) that gives the
* size of the solution data, not including the four bytes just
* read. Note that it is permitted for the size to be zero, in
* which case no further data follows for that individual
* solution. Otherwise, the first two bytes of the solution data
* is the number (again, little-endian) of the level, and the next
* four bytes are the level password. If the size is greater than
* six, then the solution time is stored as an int32 starting at
* the sixteenth byte.
*/
for (;;) {
if (!filereadint32(&file, &dword, NULL))
break;
if (dword == 0)
continue;
if (dword < 6)
return warnfile(&file, "invalid solution data");
++ss->count;
xalloc(ss->solutions, ss->count * sizeof *ss->solutions);
s = ss->solutions + ss->count - 1;
if (!filereadint16(&file, &s->number, "invalid solution file"))
return FALSE;
if (!fileread(&file, s->passwd, 4, "invalid solution file"))
return FALSE;
dword -= 6;
s->passwd[4] = '\0';
s->time = 0;
s->score = 0;
if (dword >= 10) {
if (!fileskip(&file, 6, "invalid solution file"))
return FALSE;
if (!filereadint32(&file, &s->time, "invalid solution file"))
return FALSE;
dword -= 10;
if (!s->number && !*s->passwd) {
--ss->count;
if (dword > 0 && dword < 256)
if (!fileread(&file, ss->setname, dword,
"invalid solution file"))
return FALSE;
ss->setname[dword] = '\0';
dword = 0;
}
if (!fileskip(&file, dword, "invalid solution file"))
return FALSE;
}
}
fileclose(&file, NULL);
return TRUE;
}
/* Free all memory allocated by the solutions struct.
*/
static void freesolutions(solutions *ss)
{
free(ss->solutions);
ss->solutions = NULL;
ss->count = 0;
}
/*
* Functions for reading level set files
*/
/* A single level.
*/
typedef struct level {
unsigned int number; /* level number */
unsigned int time; /* level time */
} level;
/* A set of levels.
*/
typedef struct levels {
int count; /* total number of levels */
unsigned int lastnumber; /* number of the last level */
level *levels; /* all the levels */
} levels;
/* Parse the given file and return a filled-in levels struct.
*/
static int readlevels(char const *infilename, levels *ls)
{
fileinfo file;
level *l;
unsigned long dword;
unsigned int word;
ls->count = 0;
ls->lastnumber = 0;
ls->levels = NULL;
if (!fileopen(&file, infilename, "rb", "couldn't open"))
return FALSE;
/* The first four bytes of a level set file contain the signature.
*/
if (!filereadint32(&file, &dword, "not a level set file"))
return FALSE;
if ((dword & 0x00FFFFFF) != dat_sig)
return warnfile(&file, "not a level set file");
/* The next two bytes contain the number of the last level.
*/
if (!filereadint16(&file, &ls->lastnumber, "not a solution file"))
return FALSE;
/* After that come the individual levels. The first two bytes of
* every level is a number (little-endian) that gives the size of
* the level data, not including the four bytes just read. The
* next two bytes provide the level's number, and the next two
* bytes provide the level's time limit, in seconds (or zero if
* the level has no time limit).
*/
for (;;) {
if (!filereadint16(&file, &word, NULL))
break;
if (word < 4)
return warnfile(&file, "invalid level set file");
++ls->count;
xalloc(ls->levels, ls->count * sizeof *ls->levels);
l = ls->levels + ls->count - 1;
if (!filereadint16(&file, &l->number, "invalid level set file"))
return FALSE;
if (!filereadint16(&file, &l->time, "invalid level set file"))
return FALSE;
if (!fileskip(&file, word - 4, "invalid level set file"))
return FALSE;
}
fileclose(&file, NULL);
return TRUE;
}
/* Free all memory allocated by the levels struct.
*/
static void freelevels(levels *ss)
{
free(ss->levels);
ss->levels = NULL;
ss->count = 0;
}
/*
* Top-level functions
*/
static char datadir[4096] = DEFAULT_DATA_DIR;
static char setsdir[4096] = DEFAULT_SETS_DIR;
static char savedir[4096] = DEFAULT_SAVE_DIR;
static int findlevelsandsolutions(char const *filename,
levels *ls, solutions *ss)
{
fileinfo file;
char buf[8192];
char const *homedir;
unsigned long dword;
int n;
homedir = getenv("HOME");
if (!homedir || !*homedir)
homedir = ".";
if (*datadir == '~') {
snprintf(buf, sizeof buf, "%s", datadir + 1);
snprintf(datadir, sizeof datadir, "%s%s", homedir, buf);
}
if (*setsdir == '~') {
snprintf(buf, sizeof buf, "%s", setsdir + 1);
snprintf(setsdir, sizeof setsdir, "%s%s", homedir, buf);
}
if (*savedir == '~') {
snprintf(buf, sizeof buf, "%s", savedir + 1);
snprintf(savedir, sizeof savedir, "%s%s", homedir, buf);
}
if (strchr(filename, DIRSEP))
snprintf(buf, sizeof buf, "%s", filename);
else
snprintf(buf, sizeof buf, "%s%c%s", setsdir, DIRSEP, filename);
if (!fileopen(&file, buf, "rb", NULL)) {
if (!strchr(filename, DIRSEP)) {
snprintf(buf, sizeof buf, "%s", filename);
if (fileopen(&file, filename, "rb", NULL))
goto okay;
}
return warnfile(&file, "couldn't open");
}
okay:
if (!filereadint32(&file, &dword, "invalid level set file"))
return FALSE;
if (dword == dac_sig) {
n = snprintf(buf, sizeof buf, "%s%c", datadir, DIRSEP);
if (fscanf(file.fp, "=%255s", buf + n) != 1)
return warnfile(&file, "invalid configuration file");
if (!fileopen(&file, buf, "rb", "couldn't open"))
return FALSE;
}
fileclose(&file, NULL);
if (!readlevels(buf, ls))
return FALSE;
n = strlen(filename);
if (filename[n - 4] == '.' && tolower(filename[n - 3]) == 'd'
&& tolower(filename[n - 2]) == 'a'
&& tolower(filename[n - 1]) == 't')
n -= 4;
if (strchr(filename, DIRSEP))
snprintf(buf, sizeof buf, "%.*s.tws", n, filename);
else
snprintf(buf, sizeof buf, "%s%c%.*s.tws", savedir, DIRSEP,
n, filename);
if (!readsolutions(buf, ss))
return FALSE;
return TRUE;
}
static void calculatetimesandscores(solutions *ss, levels const *ls)
{
int const tickspersec = 20;
solution *s;
int m, n;
for (m = 0, s = ss->solutions ; m < ss->count ; ++m, ++s) {
if (!s->time) {
s->score = 0;
continue;
}
for (n = 0 ; n < ls->count ; ++n)
if (ls->levels[n].number == s->number)
break;
if (n == ls->count) {
warn("found solution for nonexistent level %d", s->number);
continue;
}
s->score = s->number * 500;
if (ls->levels[n].time) {
s->time = (ls->levels[n].time * tickspersec - s->time);
s->time = (s->time + tickspersec - 1) / tickspersec;
s->score += 10 * s->time;
} else {
s->time = 0;
}
}
}
static void displaysolutioninfo(solutions *ss, char const *infilename)
{
int total, n;
if (!ss->count) {
printf("; (empty)\n");
return;
}
if (infilename)
printf("; %s\n\n", infilename);
printf("[Chip's Challenge]\n");
if (ss->currentlevel > 0)
printf("Current Level=%d\n", ss->currentlevel);
total = 0;
for (n = 0 ; n < ss->count ; ++n) {
printf("Level%u=%s",
ss->solutions[n].number, ss->solutions[n].passwd);
if (ss->solutions[n].score)
printf(",%lu,%lu", ss->solutions[n].time, ss->solutions[n].score);
putchar('\n');
total += ss->solutions[n].score;
}
printf("Highest Level=%d\n", n);
printf("Current Score=%d\n", total);
}
static void yowzitch(FILE *out)
{
fprintf(out, "Usage: twstoini [-DLS DIR] SETNAME\n"
" -L DIR Read level sets from DIR [default=%s]\n"
" -D DIR Read data files from DIR [default=%s]\n"
" -S DIR Read solution files from DIR [default=%s]\n",
DEFAULT_SETS_DIR, DEFAULT_DATA_DIR, DEFAULT_SAVE_DIR);
}
int main(int argc, char *argv[])
{
char const *setname = NULL;
levels ls;
solutions ss;
int n;
if (argc == 1 || !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
yowzitch(stdout);
return EXIT_SUCCESS;
}
for (n = 1 ; n < argc ; ++n) {
if (argv[n][0] == '-') {
switch (argv[n][1]) {
case 'D':
strcpy(datadir, argv[n][2] ? &argv[n][2] : argv[++n]);
break;
case 'L':
strcpy(setsdir, argv[n][2] ? &argv[n][2] : argv[++n]);
break;
case 'S':
strcpy(savedir, argv[n][2] ? &argv[n][2] : argv[++n]);
break;
default:
yowzitch(stderr);
return EXIT_FAILURE;
}
} else {
if (setname) {
yowzitch(stderr);
return EXIT_FAILURE;
}
setname = argv[n];
}
}
if (!findlevelsandsolutions(setname, &ls, &ss))
return EXIT_FAILURE;
calculatetimesandscores(&ss, &ls);
displaysolutioninfo(&ss, setname);
freelevels(&ls);
freesolutions(&ss);
return EXIT_SUCCESS;
}