aboutsummaryrefslogtreecommitdiff
path: root/archival/bbunzip.c
blob: 08db2752ccb67c5ae6c2f3eb67bc014198211bfd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
/* vi: set sw=4 ts=4: */
/*
 *  Common code for gunzip-like applets
 *
 *  Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#include "libbb.h"
#include "unarchive.h"

enum {
	OPT_STDOUT     = 1 << 0,
	OPT_FORCE      = 1 << 1,
	/* only some decompressors: */
	OPT_VERBOSE    = 1 << 2,
	OPT_DECOMPRESS = 1 << 3,
	OPT_TEST       = 1 << 4,
};

static
int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
{
	int fd = open3_or_warn(filename, flags, mode);
	if (fd < 0) {
		return 1;
	}
	xmove_fd(fd, to_fd);
	return 0;
}

char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
{
	return xasprintf("%s.%s", filename, expected_ext);
}

int FAST_FUNC bbunpack(char **argv,
	IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info),
	char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
	const char *expected_ext
)
{
	struct stat stat_buf;
	IF_DESKTOP(long long) int status;
	char *filename, *new_name;
	smallint exitcode = 0;
	unpack_info_t info;

	do {
		/* NB: new_name is *maybe* malloc'ed! */
		new_name = NULL;
		filename = *argv; /* can be NULL - 'streaming' bunzip2 */

		if (filename && LONE_DASH(filename))
			filename = NULL;

		/* Open src */
		if (filename) {
			if (stat(filename, &stat_buf) != 0) {
				bb_simple_perror_msg(filename);
 err:
				exitcode = 1;
				goto free_name;
			}
			if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
				goto err;
		}

		/* Special cases: test, stdout */
		if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
			if (option_mask32 & OPT_TEST)
				if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
					goto err;
			filename = NULL;
		}

		/* Open dst if we are going to unpack to file */
		if (filename) {
			new_name = make_new_name(filename, expected_ext);
			if (!new_name) {
				bb_error_msg("%s: unknown suffix - ignored", filename);
				goto err;
			}

			/* -f: overwrite existing output files */
			if (option_mask32 & OPT_FORCE) {
				unlink(new_name);
			}

			/* O_EXCL: "real" bunzip2 doesn't overwrite files */
			/* GNU gunzip does not bail out, but goes to next file */
			if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
					stat_buf.st_mode))
				goto err;
		}

		/* Check that the input is sane */
		if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
			bb_error_msg_and_die("compressed data not read from terminal, "
					"use -f to force it");
		}

		/* memset(&info, 0, sizeof(info)); */
		info.mtime = 0; /* so far it has one member only */
		status = unpacker(&info);
		if (status < 0)
			exitcode = 1;
		xclose(STDOUT_FILENO); /* with error check! */

		if (filename) {
			char *del = new_name;
			if (status >= 0) {
				/* TODO: restore other things? */
				if (info.mtime) {
					struct timeval times[2];

					times[1].tv_sec = times[0].tv_sec = info.mtime;
					times[1].tv_usec = times[0].tv_usec = 0;
					/* Note: we closed it first.
					 * On some systems calling utimes
					 * then closing resets the mtime
					 * back to current time. */
					utimes(new_name, times); /* ignoring errors */
				}

				/* Delete _compressed_ file */
				del = filename;
				/* restore extension (unless tgz -> tar case) */
				if (new_name == filename)
					filename[strlen(filename)] = '.';
			}
			xunlink(del);

#if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
			/* Extreme bloat for gunzip compat */
			if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
				fprintf(stderr, "%s: %u%% - replaced with %s\n",
					filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
			}
#endif

 free_name:
			if (new_name != filename)
				free(new_name);
		}
	} while (*argv && *++argv);

	return exitcode;
}

#if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
static
char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
{
	char *extension = strrchr(filename, '.');
	if (!extension || strcmp(extension + 1, expected_ext) != 0) {
		/* Mimic GNU gunzip - "real" bunzip2 tries to */
		/* unpack file anyway, to file.out */
		return NULL;
	}
	*extension = '\0';
	return filename;
}
#endif


/*
 * Uncompress applet for busybox (c) 2002 Glenn McGrath
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#if ENABLE_UNCOMPRESS
static
IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
{
	IF_DESKTOP(long long) int status = -1;

	if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
		bb_error_msg("invalid magic");
	} else {
		status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
	}
	return status;
}
int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uncompress_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cf");
	argv += optind;

	return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
}
#endif


/*
 * Gzip implementation for busybox
 *
 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 *
 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 * based on gzip sources
 *
 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 * well as stdin/stdout, and to generally behave itself wrt command line
 * handling.
 *
 * General cleanup to better adhere to the style guide and make use of standard
 * busybox functions by Glenn McGrath
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * The unzip code was written and put in the public domain by Mark Adler.
 * Portions of the lzw code are derived from the public domain 'compress'
 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 * Ken Turkowski, Dave Mack and Peter Jannesen.
 *
 * See the license_msg below and the file COPYING for the software license.
 * See the file algorithm.doc for the compression algorithms and file formats.
 */
#if ENABLE_GUNZIP
static
char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
{
	char *extension = strrchr(filename, '.');

	if (!extension)
		return NULL;

	extension++;
	if (strcmp(extension, "tgz" + 1) == 0
#if ENABLE_FEATURE_SEAMLESS_Z
	 || (extension[0] == 'Z' && extension[1] == '\0')
#endif
	) {
		extension[-1] = '\0';
	} else if (strcmp(extension, "tgz") == 0) {
		filename = xstrdup(filename);
		extension = strrchr(filename, '.');
		extension[2] = 'a';
		extension[3] = 'r';
	} else {
		return NULL;
	}
	return filename;
}
static
IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(unpack_info_t *info)
{
	IF_DESKTOP(long long) int status = -1;

	/* do the decompression, and cleanup */
	if (xread_char(STDIN_FILENO) == 0x1f) {
		unsigned char magic2;

		magic2 = xread_char(STDIN_FILENO);
		if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
			status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
		} else if (magic2 == 0x8b) {
			status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
		} else {
			goto bad_magic;
		}
		if (status < 0) {
			bb_error_msg("error inflating");
		}
	} else {
 bad_magic:
		bb_error_msg("invalid magic");
		/* status is still == -1 */
	}
	return status;
}
/*
 * Linux kernel build uses gzip -d -n. We accept and ignore it.
 * Man page says:
 * -n --no-name
 * gzip: do not save the original file name and time stamp.
 * (The original name is always saved if the name had to be truncated.)
 * gunzip: do not restore the original file name/time even if present
 * (remove only the gzip suffix from the compressed file name).
 * This option is the default when decompressing.
 * -N --name
 * gzip: always save the original file name and time stamp (this is the default)
 * gunzip: restore the original file name and time stamp if present.
 */
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int gunzip_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cfvdtn");
	argv += optind;
	/* if called as zcat */
	if (applet_name[1] == 'c')
		option_mask32 |= OPT_STDOUT;

	return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
}
#endif


/*
 * Modified for busybox by Glenn McGrath
 * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#if ENABLE_BUNZIP2
static
IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
{
	return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
}
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc UNUSED_PARAM, char **argv)
{
	getopt32(argv, "cfvdt");
	argv += optind;
	if (applet_name[2] == 'c') /* bzcat */
		option_mask32 |= OPT_STDOUT;

	return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
}
#endif


/*
 * Small lzma deflate implementation.
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * Based on bunzip.c from busybox
 *
 * Licensed under GPL v2, see file LICENSE in this tarball for details.
 */
#if ENABLE_UNLZMA
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
{
	return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
}
int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unlzma_main(int argc UNUSED_PARAM, char **argv)
{
	IF_LZMA(int opts =) getopt32(argv, "cfvdt");
# if ENABLE_LZMA
	/* lzma without -d or -t? */
	if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
		bb_show_usage();
# endif
	/* lzcat? */
	if (applet_name[2] == 'c')
		option_mask32 |= OPT_STDOUT;

	argv += optind;
	return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
}
#endif


#if ENABLE_UNXZ
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM)
{
	return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO);
}
int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unxz_main(int argc UNUSED_PARAM, char **argv)
{
	int opts = getopt32(argv, "cfvdt");
# if ENABLE_XZ
	/* xz without -d or -t? */
	if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
		bb_show_usage();
# endif
	/* xzcat? */
	if (applet_name[2] == 'c')
		option_mask32 |= OPT_STDOUT;

	argv += optind;
	return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
}
#endif