toast.c

柏林科技大学开发的gsm编码程序

		ut[1] = instat.st_mtime;

		(void) utime(outname, ut);

#endif	/* UTIMBUF */
	}
#endif /* HAS_UTIME */
#endif /* HAS_UTIMES */
}


static int okay_as_input P3((name,f,st), char* name, FILE* f, struct stat * st)
{
# ifdef	HAS_FSTAT
	if (fstat(fileno(f), st) < 0)
# else
	if (stat(name, st) < 0)
# endif
	{
		perror(name);
		fprintf(stderr, "%s: cannot stat \"%s\"\n", progname, name);
		return 0;
	}

	if (!S_ISREG(st->st_mode)) {
		fprintf(stderr,
			"%s: \"%s\" is not a regular file -- unchanged.\n",
			progname, name);
		return 0;
	}
	if (st->st_nlink > 1 && !f_cat && !f_precious) {
		fprintf(stderr, 
		      "%s: \"%s\" has %s other link%s -- unchanged.\n",
			progname,name,st->st_nlink - 1,"s" + (st->st_nlink<=2));
		return 0;
	}

	if (!f_decode && !f_cat && name && suffix( name, SUFFIX_TOASTED )) {
		fprintf(stderr,
			"%s: %s already has \"%s\" suffix -- unchanged.\n",
			progname, name, SUFFIX_TOASTED );
		return 0;
	}
	return 1;
}

static void prepare_io P1(( desc), struct fmtdesc * desc)
{
	output      = desc->output;
	input       = desc->input;

	init_input  = desc->init_input;
	init_output = desc->init_output;
}

static struct fmtdesc * grok_format P1((name), char * name)
{
	char * c;
	struct fmtdesc ** f;

	if (name) {
		c = plainname(name);

		for (f = alldescs; *f; f++)
			if (  (*f)->suffix
			   && *(*f)->suffix
			   && suffix(c, (*f)->suffix)) {

				free(c);
				return *f;
			}

		free(c);
	}
	return (struct fmtdesc *)0;
}

static int open_input P2((name, st), char * name, struct stat * st)
{
	struct fmtdesc * f = f_format;

	st->st_nlink = 0;	/* indicates `undefined' value */
	if (!name) {
		inname = (char *)NULL;
		in     = stdin;
	}
	else {
		if (!f_decode) inname = strcpy(emalloc(strlen(name)+1), name);
		else inname = codename(name);

		if (!(in = fopen(inname, READ))) {
			perror(inname);	/* not guaranteed to be valid here */
			fprintf(stderr, "%s: cannot open \"%s\" for reading\n",
				progname, inname);
			return 0;
		}
		if (!okay_as_input(inname, in, st)) return 0;
		if (!f) f = grok_format(inname);
	}
	prepare_io( f ? f : & DEFAULT_FORMAT );
	return 1;
}

static int open_output P1((name), char *name)
{
	if (!name || f_cat) {
		out     = stdout;
		outname = (char *)NULL;
	}
	else {
		int outfd = -1;
		char * o;

		o = (*(f_decode ? plainname : codename))(name);
		if (!length_okay(o)) return 0;
		if ((outfd = open(o, O_WRITE_EXCL, S_IREAD|S_IWRITE)) >= 0)
			out = fdopen(outfd, WRITE);
		else if (errno != EEXIST) out = (FILE *)NULL;
		else if (ok_to_replace(o)) out = fopen(o, WRITE);
		else return 0;

		if (!out) {
			perror(o);
			fprintf(stderr,
				"%s: can't open \"%s\" for writing\n",
				progname, o);
			if (outfd >= 0) (void)close(outfd);
			return 0;
		}

		outname = o;
	}
	return 1;
}

static int process_encode P0()
{
	gsm      	r;
	gsm_signal    	s[ 160 ];
	gsm_frame	d;
 
	int		cc,i, nr=0;

	if (!(r = gsm_create())) return -1;
	(void)gsm_option(r, GSM_OPT_FAST,    &f_fast);
	(void)gsm_option(r, GSM_OPT_VERBOSE, &f_verbose);

	while ((cc = (*input)(s)) > 0) {
		if (cc < sizeof(s) / sizeof(*s))
			memset((char *)(s+cc), 0, sizeof(s)-(cc * sizeof(*s)));
		gsm_encode(r, s, d);
		if (fwrite((char *)d, sizeof(d), 1, out) != 1) {
			perror(outname ? outname : "stdout");
			fprintf(stderr, "%s: error writing to %s\n",
				progname, outname ? outname : "stdout");
			gsm_destroy(r);
			return -1;
		}
	}
	if (cc < 0) {
		perror(inname ? inname : "<stdin>");
		fprintf(stderr, "%s: error reading from %s\n",
			progname, inname ? inname : "<stdin>");
		gsm_destroy(r);
		return -1;
	}
	gsm_destroy(r);

	return 0;
}

static int process_decode P0()
{
	gsm      	r;
	gsm_frame	s;
	gsm_signal	d[ 160 ];
 
	int		cc;

	if (!(r = gsm_create())) return -1;
	(void)gsm_option(r, GSM_OPT_FAST,    &f_fast);
	(void)gsm_option(r, GSM_OPT_VERBOSE, &f_verbose);

	while ((cc = fread(s, 1, sizeof(s), in)) > 0) {

		if (cc != sizeof(s)) {
			if (cc >= 0) fprintf(stderr,
			"%s: incomplete frame (%d byte%s missing) from %s\n",
					progname, sizeof(s) - cc,
					"s" + (sizeof(s) - cc == 1),
					inname ? inname : "<stdin>" );
			gsm_destroy(r);
			return -1;
		}

		if (gsm_decode(r, s, d)) {
			fprintf(stderr, "%s: bad frame in %s\n", 
				progname, outname ? outname : "stdout");
			gsm_destroy(r);
			return -1;
		}

		if ((*output)(d) < 0) {
			perror(outname);
			fprintf(stderr, "%s: error writing to %s\n",
					progname, outname);
			gsm_destroy(r);
			return -1;
		}
	}

	if (cc < 0) {
		perror(inname ? inname : "<stdin>" );
		fprintf(stderr, "%s: error reading from %s\n", progname,
			inname ? inname : "<stdin>");
		gsm_destroy(r);
		return -1;
	}

	gsm_destroy(r);
	return 0;
}

static int process P1((name), char * name)
{
	out     = (FILE *)0;
	in      = (FILE *)0;

	outname = (char *)0;
	inname  = (char *)0;

	if (  !open_input(  name, &instat )
	   || !open_output( name )
	   || (*(f_decode ? init_output    : init_input))()
	   || (*(f_decode ? process_decode : process_encode))()
	   || fflush(out) < 0
	   || ferror(out)) {

err:		if (out) {
			perror(outname ? outname : "stdout");
			fprintf(stderr, "%s: error writing \"%s\"\n",
				progname, outname ? outname : "stdout");

			if (out != stdout) {
				(void)fclose(out);
				if (  unlink(outname) < 0
				   && errno != ENOENT
				   && errno != EINTR) {

					perror(outname);
					fprintf(stderr,
						"%s: could not unlink \"%s\"\n",
						progname, outname);
				}
			}
		}

		if (in && in != stdin) fclose(in);

		if (inname  && inname  != name) free(inname);
		if (outname && outname != name) free(outname);

		return -1;
	}

	if (out != stdout) {

		update_times();
		update_mode ();
		update_own  ();

		if (fclose(out) < 0) goto err;
		free(outname);
		outname = (char *)0;
	}

	if (in  != stdin) {
		fclose(in);
		if (!f_cat && !f_precious) {
			if (unlink(inname) < 0) {
				perror(inname);
				fprintf(stderr,
					"%s: source \"%s\" not deleted.\n",
					progname, inname);
			}
		}
		free(inname);
		inname = (char *)0;
	}
	return 0;
}

static void version P0()
{
	printf( "%s 1.0, version %s\n",
		progname,
		"$Id: toast.c,v 1.4 1994/05/10 20:18:49 jutta Exp $" );
}

static void help P0()
{
	printf("Usage: %s [-fcpdhvaulsF] [files...]\n", progname);
	printf("\n");

	printf(" -f  force     Replace existing files without asking\n");
	printf(" -c  cat       Write to stdout, do not remove source files\n");
	printf(" -d  decode    Decode data (default is encode)\n");
	printf(" -p  precious  Do not delete the source\n");
	printf("\n");

	printf(" -u  u-law     Force 8 kHz/8 bit u-law in/output format\n");
	printf(" -s  sun .au   Force Sun .au u-law in/output format\n");
	printf(" -a  A-law     Force 8 kHz/8 bit A-law in/output format\n");
	printf(" -l  linear    Force 16 bit linear in/output format\n");
	printf("\n");

	printf(" -F  fast      Sacrifice conformance to performance\n");
	printf(" -v  version   Show version information\n");
	printf(" -h  help      Print this text\n");
	printf("\n");
}


static void set_format P1((f), struct fmtdesc * f)
{
	if (f_format && f_format != f) {
		fprintf( stderr,
	"%s: only one of -[uals] is possible (%s -h for help)\n",
			progname, progname);
		exit(1);
	}

	f_format = f;
}

int main P2((ac, av), int ac, char **av)
{
	int  		opt;
	extern int	optind;

	parse_argv0( *av );

	while ((opt = getopt(ac, av, "fcdpvhuaslVF")) != EOF)
	switch (opt) {

	case 'd': f_decode   = 1; break;
	case 'f': f_force    = 1; break;
	case 'c': f_cat      = 1; break;
	case 'p': f_precious = 1; break;
	case 'F': f_fast     = 1; break;

#ifndef	NDEBUG
	case 'V': f_verbose  = 1; break;	/* undocumented */
#endif

	case 'u': set_format( &f_ulaw   ); break;
	case 'l': set_format( &f_linear ); break;
	case 'a': set_format( &f_alaw	); break;
	case 's': set_format( &f_audio  ); break;

	case 'v': version(); exit(0);
	case 'h': help();    exit(0);

	default: 
		fprintf(stderr,
			"Usage: %s [-fcpdhvuaslF] [files...] (-h for help)\n",
			progname);
		exit(1);
	}

	f_precious |= f_cat;

	av += optind;
	ac -= optind;

	catch_signals(onintr);

	if (ac <= 0) process( (char *)0 );
	else while (ac--) process( *av++ );

	exit(0);
}