gun.c@ 69402

Last change on this file since 69402 was 58208, checked in by vboxsync, 9 years ago
zlib 1.2.8 unmodified
Property svn:eol-style set to `native`
File size: 25.3 KB

Line
1	/* gun.c -- simple gunzip to give an example of the use of inflateBack()
2	* Copyright (C) 2003, 2005, 2008, 2010, 2012 Mark Adler
3	* For conditions of distribution and use, see copyright notice in zlib.h
4	Version 1.7 12 August 2012 Mark Adler */
5
6	/* Version history:
7	1.0 16 Feb 2003 First version for testing of inflateBack()
8	1.1 21 Feb 2005 Decompress concatenated gzip streams
9	Remove use of "this" variable (C++ keyword)
10	Fix return value for in()
11	Improve allocation failure checking
12	Add typecasting for void * structures
13	Add -h option for command version and usage
14	Add a bunch of comments
15	1.2 20 Mar 2005 Add Unix compress (LZW) decompression
16	Copy file attributes from input file to output file
17	1.3 12 Jun 2005 Add casts for error messages [Oberhumer]
18	1.4 8 Dec 2006 LZW decompression speed improvements
19	1.5 9 Feb 2008 Avoid warning in latest version of gcc
20	1.6 17 Jan 2010 Avoid signed/unsigned comparison warnings
21	1.7 12 Aug 2012 Update for z_const usage in zlib 1.2.8
22	*/
23
24	/*
25	gun [ -t ] [ name ... ]
26
27	decompresses the data in the named gzip files. If no arguments are given,
28	gun will decompress from stdin to stdout. The names must end in .gz, -gz,
29	.z, -z, _z, or .Z. The uncompressed data will be written to a file name
30	with the suffix stripped. On success, the original file is deleted. On
31	failure, the output file is deleted. For most failures, the command will
32	continue to process the remaining names on the command line. A memory
33	allocation failure will abort the command. If -t is specified, then the
34	listed files or stdin will be tested as gzip files for integrity (without
35	checking for a proper suffix), no output will be written, and no files
36	will be deleted.
37
38	Like gzip, gun allows concatenated gzip streams and will decompress them,
39	writing all of the uncompressed data to the output. Unlike gzip, gun allows
40	an empty file on input, and will produce no error writing an empty output
41	file.
42
43	gun will also decompress files made by Unix compress, which uses LZW
44	compression. These files are automatically detected by virtue of their
45	magic header bytes. Since the end of Unix compress stream is marked by the
46	end-of-file, they cannot be concantenated. If a Unix compress stream is
47	encountered in an input file, it is the last stream in that file.
48
49	Like gunzip and uncompress, the file attributes of the orignal compressed
50	file are maintained in the final uncompressed file, to the extent that the
51	user permissions allow it.
52
53	On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version
54	1.2.4) is on the same file, when gun is linked with zlib 1.2.2. Also the
55	LZW decompression provided by gun is about twice as fast as the standard
56	Unix uncompress command.
57	*/
58
59	/* external functions and related types and constants */
60	#include <stdio.h> /* fprintf() */
61	#include <stdlib.h> /* malloc(), free() */
62	#include <string.h> /* strerror(), strcmp(), strlen(), memcpy() */
63	#include <errno.h> /* errno */
64	#include <fcntl.h> /* open() */
65	#include <unistd.h> /* read(), write(), close(), chown(), unlink() */
66	#include <sys/types.h>
67	#include <sys/stat.h> /* stat(), chmod() */
68	#include <utime.h> /* utime() */
69	#include "zlib.h" /* inflateBackInit(), inflateBack(), */
70	/* inflateBackEnd(), crc32() */
71
72	/* function declaration */
73	#define local static
74
75	/* buffer constants */
76	#define SIZE 32768U /* input and output buffer sizes */
77	#define PIECE 16384 /* limits i/o chunks for 16-bit int case */
78
79	/* structure for infback() to pass to input function in() -- it maintains the
80	input file and a buffer of size SIZE */
81	struct ind {
82	int infile;
83	unsigned char *inbuf;
84	};
85
86	/* Load input buffer, assumed to be empty, and return bytes loaded and a
87	pointer to them. read() is called until the buffer is full, or until it
88	returns end-of-file or error. Return 0 on error. */
89	local unsigned in(void in_desc, z_const unsigned char *buf)
90	{
91	int ret;
92	unsigned len;
93	unsigned char *next;
94	struct ind me = (struct ind )in_desc;
95
96	next = me->inbuf;
97	*buf = next;
98	len = 0;
99	do {
100	ret = PIECE;
101	if ((unsigned)ret > SIZE - len)
102	ret = (int)(SIZE - len);
103	ret = (int)read(me->infile, next, ret);
104	if (ret == -1) {
105	len = 0;
106	break;
107	}
108	next += ret;
109	len += ret;
110	} while (ret != 0 && len < SIZE);
111	return len;
112	}
113
114	/* structure for infback() to pass to output function out() -- it maintains the
115	output file, a running CRC-32 check on the output and the total number of
116	bytes output, both for checking against the gzip trailer. (The length in
117	the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and
118	the output is greater than 4 GB.) */
119	struct outd {
120	int outfile;
121	int check; /* true if checking crc and total */
122	unsigned long crc;
123	unsigned long total;
124	};
125
126	/* Write output buffer and update the CRC-32 and total bytes written. write()
127	is called until all of the output is written or an error is encountered.
128	On success out() returns 0. For a write failure, out() returns 1. If the
129	output file descriptor is -1, then nothing is written.
130	*/
131	local int out(void out_desc, unsigned char buf, unsigned len)
132	{
133	int ret;
134	struct outd me = (struct outd )out_desc;
135
136	if (me->check) {
137	me->crc = crc32(me->crc, buf, len);
138	me->total += len;
139	}
140	if (me->outfile != -1)
141	do {
142	ret = PIECE;
143	if ((unsigned)ret > len)
144	ret = (int)len;
145	ret = (int)write(me->outfile, buf, ret);
146	if (ret == -1)
147	return 1;
148	buf += ret;
149	len -= ret;
150	} while (len != 0);
151	return 0;
152	}
153
154	/* next input byte macro for use inside lunpipe() and gunpipe() */
155	#define NEXT() (have ? 0 : (have = in(indp, &next)), \
156	last = have ? (have--, (int)(*next++)) : -1)
157
158	/* memory for gunpipe() and lunpipe() --
159	the first 256 entries of prefix[] and suffix[] are never used, could
160	have offset the index, but it's faster to waste the memory */
161	unsigned char inbuf[SIZE]; /* input buffer */
162	unsigned char outbuf[SIZE]; /* output buffer */
163	unsigned short prefix[65536]; /* index to LZW prefix string */
164	unsigned char suffix[65536]; /* one-character LZW suffix */
165	unsigned char match[65280 + 2]; /* buffer for reversed match or gzip
166	32K sliding window */
167
168	/* throw out what's left in the current bits byte buffer (this is a vestigial
169	aspect of the compressed data format derived from an implementation that
170	made use of a special VAX machine instruction!) */
171	#define FLUSHCODE() \
172	do { \
173	left = 0; \
174	rem = 0; \
175	if (chunk > have) { \
176	chunk -= have; \
177	have = 0; \
178	if (NEXT() == -1) \
179	break; \
180	chunk--; \
181	if (chunk > have) { \
182	chunk = have = 0; \
183	break; \
184	} \
185	} \
186	have -= chunk; \
187	next += chunk; \
188	chunk = 0; \
189	} while (0)
190
191	/* Decompress a compress (LZW) file from indp to outfile. The compress magic
192	header (two bytes) has already been read and verified. There are have bytes
193	of buffered input at next. strm is used for passing error information back
194	to gunpipe().
195
196	lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of
197	file, read error, or write error (a write error indicated by strm->next_in
198	not equal to Z_NULL), or Z_DATA_ERROR for invalid input.
199	*/
200	local int lunpipe(unsigned have, z_const unsigned char next, struct ind indp,
201	int outfile, z_stream *strm)
202	{
203	int last; /* last byte read by NEXT(), or -1 if EOF */
204	unsigned chunk; /* bytes left in current chunk */
205	int left; /* bits left in rem */
206	unsigned rem; /* unused bits from input */
207	int bits; /* current bits per code */
208	unsigned code; /* code, table traversal index */
209	unsigned mask; /* mask for current bits codes */
210	int max; /* maximum bits per code for this stream */
211	unsigned flags; /* compress flags, then block compress flag */
212	unsigned end; /* last valid entry in prefix/suffix tables */
213	unsigned temp; /* current code */
214	unsigned prev; /* previous code */
215	unsigned final; /* last character written for previous code */
216	unsigned stack; /* next position for reversed string */
217	unsigned outcnt; /* bytes in output buffer */
218	struct outd outd; /* output structure */
219	unsigned char *p;
220
221	/* set up output */
222	outd.outfile = outfile;
223	outd.check = 0;
224
225	/* process remainder of compress header -- a flags byte */
226	flags = NEXT();
227	if (last == -1)
228	return Z_BUF_ERROR;
229	if (flags & 0x60) {
230	strm->msg = (char *)"unknown lzw flags set";
231	return Z_DATA_ERROR;
232	}
233	max = flags & 0x1f;
234	if (max < 9 \|\| max > 16) {
235	strm->msg = (char *)"lzw bits out of range";
236	return Z_DATA_ERROR;
237	}
238	if (max == 9) /* 9 doesn't really mean 9 */
239	max = 10;
240	flags &= 0x80; /* true if block compress */
241
242	/* clear table */
243	bits = 9;
244	mask = 0x1ff;
245	end = flags ? 256 : 255;
246
247	/* set up: get first 9-bit code, which is the first decompressed byte, but
248	don't create a table entry until the next code */
249	if (NEXT() == -1) /* no compressed data is ok */
250	return Z_OK;
251	final = prev = (unsigned)last; /* low 8 bits of code */
252	if (NEXT() == -1) /* missing a bit */
253	return Z_BUF_ERROR;
254	if (last & 1) { /* code must be < 256 */
255	strm->msg = (char *)"invalid lzw code";
256	return Z_DATA_ERROR;
257	}
258	rem = (unsigned)last >> 1; /* remaining 7 bits */
259	left = 7;
260	chunk = bits - 2; /* 7 bytes left in this chunk */
261	outbuf[0] = (unsigned char)final; /* write first decompressed byte */
262	outcnt = 1;
263
264	/* decode codes */
265	stack = 0;
266	for (;;) {
267	/* if the table will be full after this, increment the code size */
268	if (end >= mask && bits < max) {
269	FLUSHCODE();
270	bits++;
271	mask <<= 1;
272	mask++;
273	}
274
275	/* get a code of length bits */
276	if (chunk == 0) /* decrement chunk modulo bits */
277	chunk = bits;
278	code = rem; /* low bits of code */
279	if (NEXT() == -1) { /* EOF is end of compressed data */
280	/* write remaining buffered output */
281	if (outcnt && out(&outd, outbuf, outcnt)) {
282	strm->next_in = outbuf; /* signal write error */
283	return Z_BUF_ERROR;
284	}
285	return Z_OK;
286	}
287	code += (unsigned)last << left; /* middle (or high) bits of code */
288	left += 8;
289	chunk--;
290	if (bits > left) { /* need more bits */
291	if (NEXT() == -1) /* can't end in middle of code */
292	return Z_BUF_ERROR;
293	code += (unsigned)last << left; /* high bits of code */
294	left += 8;
295	chunk--;
296	}
297	code &= mask; /* mask to current code length */
298	left -= bits; /* number of unused bits */
299	rem = (unsigned)last >> (8 - left); /* unused bits from last byte */
300
301	/* process clear code (256) */
302	if (code == 256 && flags) {
303	FLUSHCODE();
304	bits = 9; /* initialize bits and mask */
305	mask = 0x1ff;
306	end = 255; /* empty table */
307	continue; /* get next code */
308	}
309
310	/* special code to reuse last match */
311	temp = code; /* save the current code */
312	if (code > end) {
313	/* Be picky on the allowed code here, and make sure that the code
314	we drop through (prev) will be a valid index so that random
315	input does not cause an exception. The code != end + 1 check is
316	empirically derived, and not checked in the original uncompress
317	code. If this ever causes a problem, that check could be safely
318	removed. Leaving this check in greatly improves gun's ability
319	to detect random or corrupted input after a compress header.
320	In any case, the prev > end check must be retained. */
321	if (code != end + 1 \|\| prev > end) {
322	strm->msg = (char *)"invalid lzw code";
323	return Z_DATA_ERROR;
324	}
325	match[stack++] = (unsigned char)final;
326	code = prev;
327	}
328
329	/* walk through linked list to generate output in reverse order */
330	p = match + stack;
331	while (code >= 256) {
332	*p++ = suffix[code];
333	code = prefix[code];
334	}
335	stack = p - match;
336	match[stack++] = (unsigned char)code;
337	final = code;
338
339	/* link new table entry */
340	if (end < mask) {
341	end++;
342	prefix[end] = (unsigned short)prev;
343	suffix[end] = (unsigned char)final;
344	}
345
346	/* set previous code for next iteration */
347	prev = temp;
348
349	/* write output in forward order */
350	while (stack > SIZE - outcnt) {
351	while (outcnt < SIZE)
352	outbuf[outcnt++] = match[--stack];
353	if (out(&outd, outbuf, outcnt)) {
354	strm->next_in = outbuf; /* signal write error */
355	return Z_BUF_ERROR;
356	}
357	outcnt = 0;
358	}
359	p = match + stack;
360	do {
361	outbuf[outcnt++] = *--p;
362	} while (p > match);
363	stack = 0;
364
365	/* loop for next code with final and prev as the last match, rem and
366	left provide the first 0..7 bits of the next code, end is the last
367	valid table entry */
368	}
369	}
370
371	/* Decompress a gzip file from infile to outfile. strm is assumed to have been
372	successfully initialized with inflateBackInit(). The input file may consist
373	of a series of gzip streams, in which case all of them will be decompressed
374	to the output file. If outfile is -1, then the gzip stream(s) integrity is
375	checked and nothing is written.
376
377	The return value is a zlib error code: Z_MEM_ERROR if out of memory,
378	Z_DATA_ERROR if the header or the compressed data is invalid, or if the
379	trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends
380	prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip
381	stream) follows a valid gzip stream.
382	*/
383	local int gunpipe(z_stream *strm, int infile, int outfile)
384	{
385	int ret, first, last;
386	unsigned have, flags, len;
387	z_const unsigned char *next = NULL;
388	struct ind ind, *indp;
389	struct outd outd;
390
391	/* setup input buffer */
392	ind.infile = infile;
393	ind.inbuf = inbuf;
394	indp = &ind;
395
396	/* decompress concatenated gzip streams */
397	have = 0; /* no input data read in yet */
398	first = 1; /* looking for first gzip header */
399	strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */
400	for (;;) {
401	/* look for the two magic header bytes for a gzip stream */
402	if (NEXT() == -1) {
403	ret = Z_OK;
404	break; /* empty gzip stream is ok */
405	}
406	if (last != 31 \|\| (NEXT() != 139 && last != 157)) {
407	strm->msg = (char *)"incorrect header check";
408	ret = first ? Z_DATA_ERROR : Z_ERRNO;
409	break; /* not a gzip or compress header */
410	}
411	first = 0; /* next non-header is junk */
412
413	/* process a compress (LZW) file -- can't be concatenated after this */
414	if (last == 157) {
415	ret = lunpipe(have, next, indp, outfile, strm);
416	break;
417	}
418
419	/* process remainder of gzip header */
420	ret = Z_BUF_ERROR;
421	if (NEXT() != 8) { /* only deflate method allowed */
422	if (last == -1) break;
423	strm->msg = (char *)"unknown compression method";
424	ret = Z_DATA_ERROR;
425	break;
426	}
427	flags = NEXT(); /* header flags */
428	NEXT(); /* discard mod time, xflgs, os */
429	NEXT();
430	NEXT();
431	NEXT();
432	NEXT();
433	NEXT();
434	if (last == -1) break;
435	if (flags & 0xe0) {
436	strm->msg = (char *)"unknown header flags set";
437	ret = Z_DATA_ERROR;
438	break;
439	}
440	if (flags & 4) { /* extra field */
441	len = NEXT();
442	len += (unsigned)(NEXT()) << 8;
443	if (last == -1) break;
444	while (len > have) {
445	len -= have;
446	have = 0;
447	if (NEXT() == -1) break;
448	len--;
449	}
450	if (last == -1) break;
451	have -= len;
452	next += len;
453	}
454	if (flags & 8) /* file name */
455	while (NEXT() != 0 && last != -1)
456	;
457	if (flags & 16) /* comment */
458	while (NEXT() != 0 && last != -1)
459	;
460	if (flags & 2) { /* header crc */
461	NEXT();
462	NEXT();
463	}
464	if (last == -1) break;
465
466	/* set up output */
467	outd.outfile = outfile;
468	outd.check = 1;
469	outd.crc = crc32(0L, Z_NULL, 0);
470	outd.total = 0;
471
472	/* decompress data to output */
473	strm->next_in = next;
474	strm->avail_in = have;
475	ret = inflateBack(strm, in, indp, out, &outd);
476	if (ret != Z_STREAM_END) break;
477	next = strm->next_in;
478	have = strm->avail_in;
479	strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */
480
481	/* check trailer */
482	ret = Z_BUF_ERROR;
483	if (NEXT() != (int)(outd.crc & 0xff) \|\|
484	NEXT() != (int)((outd.crc >> 8) & 0xff) \|\|
485	NEXT() != (int)((outd.crc >> 16) & 0xff) \|\|
486	NEXT() != (int)((outd.crc >> 24) & 0xff)) {
487	/* crc error */
488	if (last != -1) {
489	strm->msg = (char *)"incorrect data check";
490	ret = Z_DATA_ERROR;
491	}
492	break;
493	}
494	if (NEXT() != (int)(outd.total & 0xff) \|\|
495	NEXT() != (int)((outd.total >> 8) & 0xff) \|\|
496	NEXT() != (int)((outd.total >> 16) & 0xff) \|\|
497	NEXT() != (int)((outd.total >> 24) & 0xff)) {
498	/* length error */
499	if (last != -1) {
500	strm->msg = (char *)"incorrect length check";
501	ret = Z_DATA_ERROR;
502	}
503	break;
504	}
505
506	/* go back and look for another gzip stream */
507	}
508
509	/* clean up and return */
510	return ret;
511	}
512
513	/* Copy file attributes, from -> to, as best we can. This is best effort, so
514	no errors are reported. The mode bits, including suid, sgid, and the sticky
515	bit are copied (if allowed), the owner's user id and group id are copied
516	(again if allowed), and the access and modify times are copied. */
517	local void copymeta(char from, char to)
518	{
519	struct stat was;
520	struct utimbuf when;
521
522	/* get all of from's Unix meta data, return if not a regular file */
523	if (stat(from, &was) != 0 \|\| (was.st_mode & S_IFMT) != S_IFREG)
524	return;
525
526	/* set to's mode bits, ignore errors */
527	(void)chmod(to, was.st_mode & 07777);
528
529	/* copy owner's user and group, ignore errors */
530	(void)chown(to, was.st_uid, was.st_gid);
531
532	/* copy access and modify times, ignore errors */
533	when.actime = was.st_atime;
534	when.modtime = was.st_mtime;
535	(void)utime(to, &when);
536	}
537
538	/* Decompress the file inname to the file outnname, of if test is true, just
539	decompress without writing and check the gzip trailer for integrity. If
540	inname is NULL or an empty string, read from stdin. If outname is NULL or
541	an empty string, write to stdout. strm is a pre-initialized inflateBack
542	structure. When appropriate, copy the file attributes from inname to
543	outname.
544
545	gunzip() returns 1 if there is an out-of-memory error or an unexpected
546	return code from gunpipe(). Otherwise it returns 0.
547	*/
548	local int gunzip(z_stream strm, char inname, char *outname, int test)
549	{
550	int ret;
551	int infile, outfile;
552
553	/* open files */
554	if (inname == NULL \|\| *inname == 0) {
555	inname = "-";
556	infile = 0; /* stdin */
557	}
558	else {
559	infile = open(inname, O_RDONLY, 0);
560	if (infile == -1) {
561	fprintf(stderr, "gun cannot open %s\n", inname);
562	return 0;
563	}
564	}
565	if (test)
566	outfile = -1;
567	else if (outname == NULL \|\| *outname == 0) {
568	outname = "-";
569	outfile = 1; /* stdout */
570	}
571	else {
572	outfile = open(outname, O_CREAT \| O_TRUNC \| O_WRONLY, 0666);
573	if (outfile == -1) {
574	close(infile);
575	fprintf(stderr, "gun cannot create %s\n", outname);
576	return 0;
577	}
578	}
579	errno = 0;
580
581	/* decompress */
582	ret = gunpipe(strm, infile, outfile);
583	if (outfile > 2) close(outfile);
584	if (infile > 2) close(infile);
585
586	/* interpret result */
587	switch (ret) {
588	case Z_OK:
589	case Z_ERRNO:
590	if (infile > 2 && outfile > 2) {
591	copymeta(inname, outname); /* copy attributes */
592	unlink(inname);
593	}
594	if (ret == Z_ERRNO)
595	fprintf(stderr, "gun warning: trailing garbage ignored in %s\n",
596	inname);
597	break;
598	case Z_DATA_ERROR:
599	if (outfile > 2) unlink(outname);
600	fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg);
601	break;
602	case Z_MEM_ERROR:
603	if (outfile > 2) unlink(outname);
604	fprintf(stderr, "gun out of memory error--aborting\n");
605	return 1;
606	case Z_BUF_ERROR:
607	if (outfile > 2) unlink(outname);
608	if (strm->next_in != Z_NULL) {
609	fprintf(stderr, "gun write error on %s: %s\n",
610	outname, strerror(errno));
611	}
612	else if (errno) {
613	fprintf(stderr, "gun read error on %s: %s\n",
614	inname, strerror(errno));
615	}
616	else {
617	fprintf(stderr, "gun unexpected end of file on %s\n",
618	inname);
619	}
620	break;
621	default:
622	if (outfile > 2) unlink(outname);
623	fprintf(stderr, "gun internal error--aborting\n");
624	return 1;
625	}
626	return 0;
627	}
628
629	/* Process the gun command line arguments. See the command syntax near the
630	beginning of this source file. */
631	int main(int argc, char **argv)
632	{
633	int ret, len, test;
634	char *outname;
635	unsigned char *window;
636	z_stream strm;
637
638	/* initialize inflateBack state for repeated use */
639	window = match; /* reuse LZW match buffer */
640	strm.zalloc = Z_NULL;
641	strm.zfree = Z_NULL;
642	strm.opaque = Z_NULL;
643	ret = inflateBackInit(&strm, 15, window);
644	if (ret != Z_OK) {
645	fprintf(stderr, "gun out of memory error--aborting\n");
646	return 1;
647	}
648
649	/* decompress each file to the same name with the suffix removed */
650	argc--;
651	argv++;
652	test = 0;
653	if (argc && strcmp(*argv, "-h") == 0) {
654	fprintf(stderr, "gun 1.6 (17 Jan 2010)\n");
655	fprintf(stderr, "Copyright (C) 2003-2010 Mark Adler\n");
656	fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n");
657	return 0;
658	}
659	if (argc && strcmp(*argv, "-t") == 0) {
660	test = 1;
661	argc--;
662	argv++;
663	}
664	if (argc)
665	do {
666	if (test)
667	outname = NULL;
668	else {
669	len = (int)strlen(*argv);
670	if (strcmp(*argv + len - 3, ".gz") == 0 \|\|
671	strcmp(*argv + len - 3, "-gz") == 0)
672	len -= 3;
673	else if (strcmp(*argv + len - 2, ".z") == 0 \|\|
674	strcmp(*argv + len - 2, "-z") == 0 \|\|
675	strcmp(*argv + len - 2, "_z") == 0 \|\|
676	strcmp(*argv + len - 2, ".Z") == 0)
677	len -= 2;
678	else {
679	fprintf(stderr, "gun error: no gz type on %s--skipping\n",
680	*argv);
681	continue;
682	}
683	outname = malloc(len + 1);
684	if (outname == NULL) {
685	fprintf(stderr, "gun out of memory error--aborting\n");
686	ret = 1;
687	break;
688	}
689	memcpy(outname, *argv, len);
690	outname[len] = 0;
691	}
692	ret = gunzip(&strm, *argv, outname, test);
693	if (outname != NULL) free(outname);
694	if (ret) break;
695	} while (argv++, --argc);
696	else
697	ret = gunzip(&strm, NULL, NULL, test);
698
699	/* clean up */
700	inflateBackEnd(&strm);
701	return ret;
702	}

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source: vbox/trunk/src/libs/zlib-1.2.8/examples/gun.c@ 69402

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