Contents of /trunk/mkinitrd-magellan/busybox/archival/bbunzip.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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File size: 9520 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 9520 byte(s)
-updated to busybox-1.13.4
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Common code for gunzip-like applets |
4 | * |
5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
6 | */ |
7 | |
8 | #include "libbb.h" |
9 | #include "unarchive.h" |
10 | |
11 | enum { |
12 | OPT_STDOUT = 0x1, |
13 | OPT_FORCE = 0x2, |
14 | /* gunzip and bunzip2 only: */ |
15 | OPT_VERBOSE = 0x4, |
16 | OPT_DECOMPRESS = 0x8, |
17 | OPT_TEST = 0x10, |
18 | }; |
19 | |
20 | static |
21 | int open_to_or_warn(int to_fd, const char *filename, int flags, int mode) |
22 | { |
23 | int fd = open3_or_warn(filename, flags, mode); |
24 | if (fd < 0) { |
25 | return 1; |
26 | } |
27 | xmove_fd(fd, to_fd); |
28 | return 0; |
29 | } |
30 | |
31 | int FAST_FUNC bbunpack(char **argv, |
32 | char* (*make_new_name)(char *filename), |
33 | USE_DESKTOP(long long) int (*unpacker)(unpack_info_t *info) |
34 | ) |
35 | { |
36 | struct stat stat_buf; |
37 | USE_DESKTOP(long long) int status; |
38 | char *filename, *new_name; |
39 | smallint exitcode = 0; |
40 | unpack_info_t info; |
41 | |
42 | do { |
43 | /* NB: new_name is *maybe* malloc'ed! */ |
44 | new_name = NULL; |
45 | filename = *argv; /* can be NULL - 'streaming' bunzip2 */ |
46 | |
47 | if (filename && LONE_DASH(filename)) |
48 | filename = NULL; |
49 | |
50 | /* Open src */ |
51 | if (filename) { |
52 | if (stat(filename, &stat_buf) != 0) { |
53 | bb_simple_perror_msg(filename); |
54 | err: |
55 | exitcode = 1; |
56 | goto free_name; |
57 | } |
58 | if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0)) |
59 | goto err; |
60 | } |
61 | |
62 | /* Special cases: test, stdout */ |
63 | if (option_mask32 & (OPT_STDOUT|OPT_TEST)) { |
64 | if (option_mask32 & OPT_TEST) |
65 | if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0)) |
66 | goto err; |
67 | filename = NULL; |
68 | } |
69 | |
70 | /* Open dst if we are going to unpack to file */ |
71 | if (filename) { |
72 | new_name = make_new_name(filename); |
73 | if (!new_name) { |
74 | bb_error_msg("%s: unknown suffix - ignored", filename); |
75 | goto err; |
76 | } |
77 | |
78 | /* -f: overwrite existing output files */ |
79 | if (option_mask32 & OPT_FORCE) { |
80 | unlink(new_name); |
81 | } |
82 | |
83 | /* O_EXCL: "real" bunzip2 doesn't overwrite files */ |
84 | /* GNU gunzip does not bail out, but goes to next file */ |
85 | if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL, |
86 | stat_buf.st_mode)) |
87 | goto err; |
88 | } |
89 | |
90 | /* Check that the input is sane */ |
91 | if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) { |
92 | bb_error_msg_and_die("compressed data not read from terminal, " |
93 | "use -f to force it"); |
94 | } |
95 | |
96 | /* memset(&info, 0, sizeof(info)); */ |
97 | info.mtime = 0; /* so far it has one member only */ |
98 | status = unpacker(&info); |
99 | if (status < 0) |
100 | exitcode = 1; |
101 | |
102 | if (filename) { |
103 | char *del = new_name; |
104 | if (status >= 0) { |
105 | /* TODO: restore other things? */ |
106 | if (info.mtime) { |
107 | struct utimbuf times; |
108 | |
109 | times.actime = info.mtime; |
110 | times.modtime = info.mtime; |
111 | /* Close first. |
112 | * On some systems calling utime |
113 | * then closing resets the mtime. */ |
114 | close(STDOUT_FILENO); |
115 | /* Ignoring errors */ |
116 | utime(new_name, ×); |
117 | } |
118 | |
119 | /* Delete _compressed_ file */ |
120 | del = filename; |
121 | /* restore extension (unless tgz -> tar case) */ |
122 | if (new_name == filename) |
123 | filename[strlen(filename)] = '.'; |
124 | } |
125 | xunlink(del); |
126 | |
127 | #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */ |
128 | /* Extreme bloat for gunzip compat */ |
129 | if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) { |
130 | fprintf(stderr, "%s: %u%% - replaced with %s\n", |
131 | filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name); |
132 | } |
133 | #endif |
134 | |
135 | free_name: |
136 | if (new_name != filename) |
137 | free(new_name); |
138 | } |
139 | } while (*argv && *++argv); |
140 | |
141 | return exitcode; |
142 | } |
143 | |
144 | #if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS |
145 | |
146 | static |
147 | char* make_new_name_generic(char *filename, const char *expected_ext) |
148 | { |
149 | char *extension = strrchr(filename, '.'); |
150 | if (!extension || strcmp(extension + 1, expected_ext) != 0) { |
151 | /* Mimic GNU gunzip - "real" bunzip2 tries to */ |
152 | /* unpack file anyway, to file.out */ |
153 | return NULL; |
154 | } |
155 | *extension = '\0'; |
156 | return filename; |
157 | } |
158 | |
159 | #endif |
160 | |
161 | |
162 | /* |
163 | * Modified for busybox by Glenn McGrath |
164 | * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no> |
165 | * |
166 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
167 | */ |
168 | |
169 | #if ENABLE_BUNZIP2 |
170 | |
171 | static |
172 | char* make_new_name_bunzip2(char *filename) |
173 | { |
174 | return make_new_name_generic(filename, "bz2"); |
175 | } |
176 | |
177 | static |
178 | USE_DESKTOP(long long) int unpack_bunzip2(unpack_info_t *info UNUSED_PARAM) |
179 | { |
180 | return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO); |
181 | } |
182 | |
183 | int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
184 | int bunzip2_main(int argc UNUSED_PARAM, char **argv) |
185 | { |
186 | getopt32(argv, "cfvdt"); |
187 | argv += optind; |
188 | if (applet_name[2] == 'c') |
189 | option_mask32 |= OPT_STDOUT; |
190 | |
191 | return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2); |
192 | } |
193 | |
194 | #endif |
195 | |
196 | |
197 | /* |
198 | * Gzip implementation for busybox |
199 | * |
200 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
201 | * |
202 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
203 | * based on gzip sources |
204 | * |
205 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as |
206 | * well as stdin/stdout, and to generally behave itself wrt command line |
207 | * handling. |
208 | * |
209 | * General cleanup to better adhere to the style guide and make use of standard |
210 | * busybox functions by Glenn McGrath |
211 | * |
212 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
213 | * |
214 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
215 | * Copyright (C) 1992-1993 Jean-loup Gailly |
216 | * The unzip code was written and put in the public domain by Mark Adler. |
217 | * Portions of the lzw code are derived from the public domain 'compress' |
218 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
219 | * Ken Turkowski, Dave Mack and Peter Jannesen. |
220 | * |
221 | * See the license_msg below and the file COPYING for the software license. |
222 | * See the file algorithm.doc for the compression algorithms and file formats. |
223 | */ |
224 | |
225 | #if ENABLE_GUNZIP |
226 | |
227 | static |
228 | char* make_new_name_gunzip(char *filename) |
229 | { |
230 | char *extension = strrchr(filename, '.'); |
231 | |
232 | if (!extension) |
233 | return NULL; |
234 | |
235 | extension++; |
236 | if (strcmp(extension, "tgz" + 1) == 0 |
237 | #if ENABLE_FEATURE_SEAMLESS_Z |
238 | || (extension[0] == 'Z' && extension[1] == '\0') |
239 | #endif |
240 | ) { |
241 | extension[-1] = '\0'; |
242 | } else if (strcmp(extension, "tgz") == 0) { |
243 | filename = xstrdup(filename); |
244 | extension = strrchr(filename, '.'); |
245 | extension[2] = 'a'; |
246 | extension[3] = 'r'; |
247 | } else { |
248 | return NULL; |
249 | } |
250 | return filename; |
251 | } |
252 | |
253 | static |
254 | USE_DESKTOP(long long) int unpack_gunzip(unpack_info_t *info) |
255 | { |
256 | USE_DESKTOP(long long) int status = -1; |
257 | |
258 | /* do the decompression, and cleanup */ |
259 | if (xread_char(STDIN_FILENO) == 0x1f) { |
260 | unsigned char magic2; |
261 | |
262 | magic2 = xread_char(STDIN_FILENO); |
263 | if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) { |
264 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO); |
265 | } else if (magic2 == 0x8b) { |
266 | status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info); |
267 | } else { |
268 | goto bad_magic; |
269 | } |
270 | if (status < 0) { |
271 | bb_error_msg("error inflating"); |
272 | } |
273 | } else { |
274 | bad_magic: |
275 | bb_error_msg("invalid magic"); |
276 | /* status is still == -1 */ |
277 | } |
278 | return status; |
279 | } |
280 | |
281 | /* |
282 | * Linux kernel build uses gzip -d -n. We accept and ignore it. |
283 | * Man page says: |
284 | * -n --no-name |
285 | * gzip: do not save the original file name and time stamp. |
286 | * (The original name is always saved if the name had to be truncated.) |
287 | * gunzip: do not restore the original file name/time even if present |
288 | * (remove only the gzip suffix from the compressed file name). |
289 | * This option is the default when decompressing. |
290 | * -N --name |
291 | * gzip: always save the original file name and time stamp (this is the default) |
292 | * gunzip: restore the original file name and time stamp if present. |
293 | */ |
294 | |
295 | int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
296 | int gunzip_main(int argc UNUSED_PARAM, char **argv) |
297 | { |
298 | getopt32(argv, "cfvdtn"); |
299 | argv += optind; |
300 | /* if called as zcat */ |
301 | if (applet_name[1] == 'c') |
302 | option_mask32 |= OPT_STDOUT; |
303 | |
304 | return bbunpack(argv, make_new_name_gunzip, unpack_gunzip); |
305 | } |
306 | |
307 | #endif |
308 | |
309 | |
310 | /* |
311 | * Small lzma deflate implementation. |
312 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> |
313 | * |
314 | * Based on bunzip.c from busybox |
315 | * |
316 | * Licensed under GPL v2, see file LICENSE in this tarball for details. |
317 | */ |
318 | |
319 | #if ENABLE_UNLZMA |
320 | |
321 | static |
322 | char* make_new_name_unlzma(char *filename) |
323 | { |
324 | return make_new_name_generic(filename, "lzma"); |
325 | } |
326 | |
327 | static |
328 | USE_DESKTOP(long long) int unpack_unlzma(unpack_info_t *info UNUSED_PARAM) |
329 | { |
330 | return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO); |
331 | } |
332 | |
333 | int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
334 | int unlzma_main(int argc UNUSED_PARAM, char **argv) |
335 | { |
336 | getopt32(argv, "cf"); |
337 | argv += optind; |
338 | /* lzmacat? */ |
339 | if (applet_name[4] == 'c') |
340 | option_mask32 |= OPT_STDOUT; |
341 | |
342 | return bbunpack(argv, make_new_name_unlzma, unpack_unlzma); |
343 | } |
344 | |
345 | #endif |
346 | |
347 | |
348 | /* |
349 | * Uncompress applet for busybox (c) 2002 Glenn McGrath |
350 | * |
351 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
352 | */ |
353 | |
354 | #if ENABLE_UNCOMPRESS |
355 | |
356 | static |
357 | char* make_new_name_uncompress(char *filename) |
358 | { |
359 | return make_new_name_generic(filename, "Z"); |
360 | } |
361 | |
362 | static |
363 | USE_DESKTOP(long long) int unpack_uncompress(unpack_info_t *info UNUSED_PARAM) |
364 | { |
365 | USE_DESKTOP(long long) int status = -1; |
366 | |
367 | if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) { |
368 | bb_error_msg("invalid magic"); |
369 | } else { |
370 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO); |
371 | } |
372 | return status; |
373 | } |
374 | |
375 | int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
376 | int uncompress_main(int argc UNUSED_PARAM, char **argv) |
377 | { |
378 | getopt32(argv, "cf"); |
379 | argv += optind; |
380 | |
381 | return bbunpack(argv, make_new_name_uncompress, unpack_uncompress); |
382 | } |
383 | |
384 | #endif |