2  * Copyright (c) Ian F. Darwin 1986-1995.
4  * maintained 1995-present by Christos Zoulas and others.
30  *	zmagic() - returns 0 if not recognized, uncompresses and prints
32  *	uncompress(method, old, n, newch) - uncompress old into new,
70 #include <zlib.h>
102 int tty = -1;
104 	if (tty == -1) \
105 		tty = open("/dev/tty", O_RDWR); \
106 	if (tty == -1) \
117  * defined if we have a built-in zlib, and the built-in zlib handles that.
118  * That is not true for android where we have zlib.h and not -lz.
121     "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))";
123 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL };
153 #define gzip_flags "-cd"
160 	"uncompress", "-c", NULL
163 	"bzip2", "-cd", NULL
169 	"xz", "-cd", NULL
172 	"lrzip", "-qdf", "-", NULL
175 	"lz4", "-cd", NULL
178 	"zstd", "-cd", NULL
212     { { .magic = "BZh" },	3, bzip2_args, do_bzlib },/* 7, bzip2-ed */
213     { { .magic = "LZIP" },	4, lzip_args, NULL },	/* 8, lzip-ed */
218     { { .func = lzmacmp },	-13, xz_args, NULL },	/* 13, lzma */
220     { { .func = zlibcmp },	-2, zlib_args, NULL },	/* 14, zlib */
269 	int mime = ms->flags & MAGIC_MIME;  in format_decompression_error()
276 			*p = '-';  in format_decompression_error()
278 	return file_printf(ms, "application/x-decompression-error-%s-%s",  in format_decompression_error()
290 	int mime = ms->flags & MAGIC_MIME;  in file_zmagic()
291 	int fd = b->fd;  in file_zmagic()
292 	const unsigned char *buf = CAST(const unsigned char *, b->fbuf);  in file_zmagic()
293 	size_t nbytes = b->flen;  in file_zmagic()
297 	if ((ms->flags & MAGIC_COMPRESS) == 0)  in file_zmagic()
320 			sa_saved = sigaction(SIGPIPE, &new_act, &sig_act) != -1;  in file_zmagic()
325 		urv = uncompressbuf(fd, ms->bytes_max, i,   in file_zmagic()
326 		    (ms->flags & MAGIC_NO_COMPRESS_FORK), buf, &newbuf, &nsz);  in file_zmagic()
332 			ms->flags &= ~MAGIC_COMPRESS;  in file_zmagic()
336 				prv = file_buffer(ms, -1, NULL, name, newbuf,  in file_zmagic()
338 			if (prv == -1)  in file_zmagic()
341 			if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0)  in file_zmagic()
346 			    mime ? " compressed-encoding=" : " (")) == -1)  in file_zmagic()
354 			if (file_buffer(ms, -1, NULL, NULL, buf, nbytes) == -1)  in file_zmagic()
361 				if (file_printf(ms, "%s", rbuf) == -1) {  in file_zmagic()
367 			if (!mime && file_printf(ms, ")") == -1)  in file_zmagic()
376 			rv = -1;  in file_zmagic()
387 	ms->flags |= MAGIC_COMPRESS;  in file_zmagic()
403 		case -1:  in swrite()
406 			return -1;  in swrite()
408 			n -= rv;  in swrite()
433 	if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) {  in sread()
449 			if (selrv == -1) {  in sread()
470 		case -1:  in sread()
473 			return -1;  in sread()
475 			return rn - n;  in sread()
477 			n -= rv;  in sread()
527 	if (tfd == -1) {  in file_pipe2file()
530 		return -1;  in file_pipe2file()
542 	case -1:  in file_pipe2file()
544 		return -1;  in file_pipe2file()
549 		return -1;  in file_pipe2file()
557 	if ((fd = dup2(tfd, fd)) == -1) {  in file_pipe2file()
559 		return -1;  in file_pipe2file()
562 	if (lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) {  in file_pipe2file()
564 		return -1;  in file_pipe2file()
611 	*n -= data_start;  in uncompressgzipped()
620     size_t bytes_max, size_t *n, int zlib)  in uncompresszlib()  argument
625 	DPRINTF("builtin zlib decompression\n");  in uncompresszlib()
635 	rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15);  in uncompresszlib()
650 	/* let's keep the nul-terminate tradition */  in uncompresszlib()
691 	/* let's keep the nul-terminate tradition */  in uncompressbzlib()
729 	/* let's keep the nul-terminate tradition */  in uncompressxzlib()
773 	/* let's keep the nul-terminate tradition */  in uncompresszstd()
813 			old_remaining -= wr;  in uncompresslzlib()
819 			new_remaining -= rd;  in uncompresslzlib()
835 	/* let's keep the nul-terminate tradition */  in uncompresslzlib()
926 	if (fd[i] == -1)  in closefd()
929 	fd[i] = -1;  in closefd()
950 	if (dup2(fd, i) == -1) {  in movedesc()
972 	if (fd != -1) {  in handledesc()
1007 	if (pid == -1) {  in writechild()
1009 		return -1;  in writechild()
1058 		return "zlib";  in methodname()
1130 	pid_t writepid = -1;  in uncompressbuf()
1156 		fdp[i][0] = fdp[i][1] = -1;  in uncompressbuf()
1172 	if ((fd == -1 && file_pipe_closexec(fdp[STDIN_FILENO]) == -1) ||  in uncompressbuf()
1173 	    file_pipe_closexec(fdp[STDOUT_FILENO]) == -1 ||  in uncompressbuf()
1174 	    file_pipe_closexec(fdp[STDERR_FILENO]) == -1) {  in uncompressbuf()
1193 	if (status == -1) {  in uncompressbuf()
1199 	 * may be _much_ faster (10-100 times) than fork.  in uncompressbuf()
1202 	if (pid == -1) {  in uncompressbuf()
1226 	if (fd == -1) {  in uncompressbuf()
1229 		if (writepid == (pid_t)-1) {  in uncompressbuf()
1279 	if (w == -1) {  in uncompressbuf()
1293 		writepid = -1;  in uncompressbuf()