Contents of /trunk/mkinitrd-magellan/busybox/archival/bbunzip.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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File size: 11209 byte(s)
Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 11209 byte(s)
-updated to busybox-1.17.1
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 | #include "libbb.h" |
8 | #include "unarchive.h" |
9 | |
10 | enum { |
11 | OPT_STDOUT = 1 << 0, |
12 | OPT_FORCE = 1 << 1, |
13 | /* only some decompressors: */ |
14 | OPT_VERBOSE = 1 << 2, |
15 | OPT_DECOMPRESS = 1 << 3, |
16 | OPT_TEST = 1 << 4, |
17 | }; |
18 | |
19 | static |
20 | int open_to_or_warn(int to_fd, const char *filename, int flags, int mode) |
21 | { |
22 | int fd = open3_or_warn(filename, flags, mode); |
23 | if (fd < 0) { |
24 | return 1; |
25 | } |
26 | xmove_fd(fd, to_fd); |
27 | return 0; |
28 | } |
29 | |
30 | char* FAST_FUNC append_ext(char *filename, const char *expected_ext) |
31 | { |
32 | return xasprintf("%s.%s", filename, expected_ext); |
33 | } |
34 | |
35 | int FAST_FUNC bbunpack(char **argv, |
36 | IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info), |
37 | char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext), |
38 | const char *expected_ext |
39 | ) |
40 | { |
41 | struct stat stat_buf; |
42 | IF_DESKTOP(long long) int status; |
43 | char *filename, *new_name; |
44 | smallint exitcode = 0; |
45 | unpack_info_t info; |
46 | |
47 | do { |
48 | /* NB: new_name is *maybe* malloc'ed! */ |
49 | new_name = NULL; |
50 | filename = *argv; /* can be NULL - 'streaming' bunzip2 */ |
51 | |
52 | if (filename && LONE_DASH(filename)) |
53 | filename = NULL; |
54 | |
55 | /* Open src */ |
56 | if (filename) { |
57 | if (stat(filename, &stat_buf) != 0) { |
58 | bb_simple_perror_msg(filename); |
59 | err: |
60 | exitcode = 1; |
61 | goto free_name; |
62 | } |
63 | if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0)) |
64 | goto err; |
65 | } |
66 | |
67 | /* Special cases: test, stdout */ |
68 | if (option_mask32 & (OPT_STDOUT|OPT_TEST)) { |
69 | if (option_mask32 & OPT_TEST) |
70 | if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0)) |
71 | goto err; |
72 | filename = NULL; |
73 | } |
74 | |
75 | /* Open dst if we are going to unpack to file */ |
76 | if (filename) { |
77 | new_name = make_new_name(filename, expected_ext); |
78 | if (!new_name) { |
79 | bb_error_msg("%s: unknown suffix - ignored", filename); |
80 | goto err; |
81 | } |
82 | |
83 | /* -f: overwrite existing output files */ |
84 | if (option_mask32 & OPT_FORCE) { |
85 | unlink(new_name); |
86 | } |
87 | |
88 | /* O_EXCL: "real" bunzip2 doesn't overwrite files */ |
89 | /* GNU gunzip does not bail out, but goes to next file */ |
90 | if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL, |
91 | stat_buf.st_mode)) |
92 | goto err; |
93 | } |
94 | |
95 | /* Check that the input is sane */ |
96 | if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) { |
97 | bb_error_msg_and_die("compressed data not read from terminal, " |
98 | "use -f to force it"); |
99 | } |
100 | |
101 | /* memset(&info, 0, sizeof(info)); */ |
102 | info.mtime = 0; /* so far it has one member only */ |
103 | status = unpacker(&info); |
104 | if (status < 0) |
105 | exitcode = 1; |
106 | xclose(STDOUT_FILENO); /* with error check! */ |
107 | |
108 | if (filename) { |
109 | char *del = new_name; |
110 | if (status >= 0) { |
111 | /* TODO: restore other things? */ |
112 | if (info.mtime) { |
113 | struct timeval times[2]; |
114 | |
115 | times[1].tv_sec = times[0].tv_sec = info.mtime; |
116 | times[1].tv_usec = times[0].tv_usec = 0; |
117 | /* Note: we closed it first. |
118 | * On some systems calling utimes |
119 | * then closing resets the mtime |
120 | * back to current time. */ |
121 | utimes(new_name, times); /* ignoring errors */ |
122 | } |
123 | |
124 | /* Delete _compressed_ file */ |
125 | del = filename; |
126 | /* restore extension (unless tgz -> tar case) */ |
127 | if (new_name == filename) |
128 | filename[strlen(filename)] = '.'; |
129 | } |
130 | xunlink(del); |
131 | |
132 | #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */ |
133 | /* Extreme bloat for gunzip compat */ |
134 | if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) { |
135 | fprintf(stderr, "%s: %u%% - replaced with %s\n", |
136 | filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name); |
137 | } |
138 | #endif |
139 | |
140 | free_name: |
141 | if (new_name != filename) |
142 | free(new_name); |
143 | } |
144 | } while (*argv && *++argv); |
145 | |
146 | return exitcode; |
147 | } |
148 | |
149 | #if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ |
150 | static |
151 | char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext) |
152 | { |
153 | char *extension = strrchr(filename, '.'); |
154 | if (!extension || strcmp(extension + 1, expected_ext) != 0) { |
155 | /* Mimic GNU gunzip - "real" bunzip2 tries to */ |
156 | /* unpack file anyway, to file.out */ |
157 | return NULL; |
158 | } |
159 | *extension = '\0'; |
160 | return filename; |
161 | } |
162 | #endif |
163 | |
164 | |
165 | /* |
166 | * Uncompress applet for busybox (c) 2002 Glenn McGrath |
167 | * |
168 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
169 | */ |
170 | #if ENABLE_UNCOMPRESS |
171 | static |
172 | IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(unpack_info_t *info UNUSED_PARAM) |
173 | { |
174 | IF_DESKTOP(long long) int status = -1; |
175 | |
176 | if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) { |
177 | bb_error_msg("invalid magic"); |
178 | } else { |
179 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO); |
180 | } |
181 | return status; |
182 | } |
183 | int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
184 | int uncompress_main(int argc UNUSED_PARAM, char **argv) |
185 | { |
186 | getopt32(argv, "cf"); |
187 | argv += optind; |
188 | |
189 | return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z"); |
190 | } |
191 | #endif |
192 | |
193 | |
194 | /* |
195 | * Gzip implementation for busybox |
196 | * |
197 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
198 | * |
199 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
200 | * based on gzip sources |
201 | * |
202 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as |
203 | * well as stdin/stdout, and to generally behave itself wrt command line |
204 | * handling. |
205 | * |
206 | * General cleanup to better adhere to the style guide and make use of standard |
207 | * busybox functions by Glenn McGrath |
208 | * |
209 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
210 | * |
211 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
212 | * Copyright (C) 1992-1993 Jean-loup Gailly |
213 | * The unzip code was written and put in the public domain by Mark Adler. |
214 | * Portions of the lzw code are derived from the public domain 'compress' |
215 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
216 | * Ken Turkowski, Dave Mack and Peter Jannesen. |
217 | * |
218 | * See the license_msg below and the file COPYING for the software license. |
219 | * See the file algorithm.doc for the compression algorithms and file formats. |
220 | */ |
221 | #if ENABLE_GUNZIP |
222 | static |
223 | char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM) |
224 | { |
225 | char *extension = strrchr(filename, '.'); |
226 | |
227 | if (!extension) |
228 | return NULL; |
229 | |
230 | extension++; |
231 | if (strcmp(extension, "tgz" + 1) == 0 |
232 | #if ENABLE_FEATURE_SEAMLESS_Z |
233 | || (extension[0] == 'Z' && extension[1] == '\0') |
234 | #endif |
235 | ) { |
236 | extension[-1] = '\0'; |
237 | } else if (strcmp(extension, "tgz") == 0) { |
238 | filename = xstrdup(filename); |
239 | extension = strrchr(filename, '.'); |
240 | extension[2] = 'a'; |
241 | extension[3] = 'r'; |
242 | } else { |
243 | return NULL; |
244 | } |
245 | return filename; |
246 | } |
247 | static |
248 | IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(unpack_info_t *info) |
249 | { |
250 | IF_DESKTOP(long long) int status = -1; |
251 | |
252 | /* do the decompression, and cleanup */ |
253 | if (xread_char(STDIN_FILENO) == 0x1f) { |
254 | unsigned char magic2; |
255 | |
256 | magic2 = xread_char(STDIN_FILENO); |
257 | if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) { |
258 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO); |
259 | } else if (magic2 == 0x8b) { |
260 | status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info); |
261 | } else { |
262 | goto bad_magic; |
263 | } |
264 | if (status < 0) { |
265 | bb_error_msg("error inflating"); |
266 | } |
267 | } else { |
268 | bad_magic: |
269 | bb_error_msg("invalid magic"); |
270 | /* status is still == -1 */ |
271 | } |
272 | return status; |
273 | } |
274 | /* |
275 | * Linux kernel build uses gzip -d -n. We accept and ignore it. |
276 | * Man page says: |
277 | * -n --no-name |
278 | * gzip: do not save the original file name and time stamp. |
279 | * (The original name is always saved if the name had to be truncated.) |
280 | * gunzip: do not restore the original file name/time even if present |
281 | * (remove only the gzip suffix from the compressed file name). |
282 | * This option is the default when decompressing. |
283 | * -N --name |
284 | * gzip: always save the original file name and time stamp (this is the default) |
285 | * gunzip: restore the original file name and time stamp if present. |
286 | */ |
287 | int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
288 | int gunzip_main(int argc UNUSED_PARAM, char **argv) |
289 | { |
290 | getopt32(argv, "cfvdtn"); |
291 | argv += optind; |
292 | /* if called as zcat */ |
293 | if (applet_name[1] == 'c') |
294 | option_mask32 |= OPT_STDOUT; |
295 | |
296 | return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL); |
297 | } |
298 | #endif |
299 | |
300 | |
301 | /* |
302 | * Modified for busybox by Glenn McGrath |
303 | * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no> |
304 | * |
305 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
306 | */ |
307 | //usage:#define bunzip2_trivial_usage |
308 | //usage: "[OPTIONS] [FILE]..." |
309 | //usage:#define bunzip2_full_usage "\n\n" |
310 | //usage: "Decompress FILEs (or stdin)\n" |
311 | //usage: "\nOptions:" |
312 | //usage: "\n -c Write to stdout" |
313 | //usage: "\n -f Force" |
314 | //usage:#define bzcat_trivial_usage |
315 | //usage: "FILE" |
316 | //usage:#define bzcat_full_usage "\n\n" |
317 | //usage: "Decompress to stdout" |
318 | //applet:IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP)) |
319 | //applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat)) |
320 | #if ENABLE_BUNZIP2 |
321 | static |
322 | IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM) |
323 | { |
324 | return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO); |
325 | } |
326 | int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
327 | int bunzip2_main(int argc UNUSED_PARAM, char **argv) |
328 | { |
329 | getopt32(argv, "cfvdt"); |
330 | argv += optind; |
331 | if (applet_name[2] == 'c') /* bzcat */ |
332 | option_mask32 |= OPT_STDOUT; |
333 | |
334 | return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2"); |
335 | } |
336 | #endif |
337 | |
338 | |
339 | /* |
340 | * Small lzma deflate implementation. |
341 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> |
342 | * |
343 | * Based on bunzip.c from busybox |
344 | * |
345 | * Licensed under GPL v2, see file LICENSE in this tarball for details. |
346 | */ |
347 | #if ENABLE_UNLZMA |
348 | static |
349 | IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(unpack_info_t *info UNUSED_PARAM) |
350 | { |
351 | return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO); |
352 | } |
353 | int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
354 | int unlzma_main(int argc UNUSED_PARAM, char **argv) |
355 | { |
356 | IF_LZMA(int opts =) getopt32(argv, "cfvdt"); |
357 | # if ENABLE_LZMA |
358 | /* lzma without -d or -t? */ |
359 | if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST))) |
360 | bb_show_usage(); |
361 | # endif |
362 | /* lzcat? */ |
363 | if (applet_name[2] == 'c') |
364 | option_mask32 |= OPT_STDOUT; |
365 | |
366 | argv += optind; |
367 | return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma"); |
368 | } |
369 | #endif |
370 | |
371 | |
372 | #if ENABLE_UNXZ |
373 | static |
374 | IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM) |
375 | { |
376 | struct { |
377 | uint32_t v1; |
378 | uint16_t v2; |
379 | } magic; |
380 | xread(STDIN_FILENO, &magic, 6); |
381 | if (magic.v1 != XZ_MAGIC1a || magic.v2 != XZ_MAGIC2a) { |
382 | bb_error_msg("invalid magic"); |
383 | return -1; |
384 | } |
385 | return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO); |
386 | } |
387 | int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
388 | int unxz_main(int argc UNUSED_PARAM, char **argv) |
389 | { |
390 | IF_XZ(int opts =) getopt32(argv, "cfvdt"); |
391 | # if ENABLE_XZ |
392 | /* xz without -d or -t? */ |
393 | if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST))) |
394 | bb_show_usage(); |
395 | # endif |
396 | /* xzcat? */ |
397 | if (applet_name[2] == 'c') |
398 | option_mask32 |= OPT_STDOUT; |
399 | |
400 | argv += optind; |
401 | return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz"); |
402 | } |
403 | #endif |