source: MondoRescue/branches/stable/mindi-busybox/archival/unzip.c@ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 10.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini unzip implementation for busybox
4 *
5 * Copyright (C) 2004 by Ed Clark
6 *
7 * Loosely based on original busybox unzip applet by Laurence Anderson.
8 * All options and features should work in this version.
9 *
10 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
11 */
12
13/* For reference see
14 * http://www.pkware.com/company/standards/appnote/
15 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
16 */
17
18/* TODO
19 * Endian issues
20 * Zip64 + other methods
21 * Improve handling of zip format, ie.
22 * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
23 * - unix file permissions, etc.
24 * - central directory
25 */
26
27#include <fcntl.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31#include <errno.h>
32#include "unarchive.h"
33#include "busybox.h"
34
35#if BB_BIG_ENDIAN
36static inline unsigned short
37__swap16(unsigned short x) {
38 return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
39}
40
41static inline uint32_t
42__swap32(uint32_t x) {
43 return (((x & 0xFF) << 24) |
44 ((x & 0xFF00) << 8) |
45 ((x & 0xFF0000) >> 8) |
46 ((x & 0xFF000000) >> 24));
47}
48#else /* it's little-endian */
49# define __swap16(x) (x)
50# define __swap32(x) (x)
51#endif /* BB_BIG_ENDIAN */
52
53#define ZIP_FILEHEADER_MAGIC __swap32(0x04034b50)
54#define ZIP_CDS_MAGIC __swap32(0x02014b50)
55#define ZIP_CDS_END_MAGIC __swap32(0x06054b50)
56#define ZIP_DD_MAGIC __swap32(0x08074b50)
57
58extern unsigned int gunzip_crc;
59extern unsigned int gunzip_bytes_out;
60
61typedef union {
62 unsigned char raw[26];
63 struct {
64 unsigned short version; /* 0-1 */
65 unsigned short flags; /* 2-3 */
66 unsigned short method; /* 4-5 */
67 unsigned short modtime; /* 6-7 */
68 unsigned short moddate; /* 8-9 */
69 unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
70 unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
71 unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
72 unsigned short filename_len; /* 22-23 */
73 unsigned short extra_len; /* 24-25 */
74 } formated ATTRIBUTE_PACKED;
75} zip_header_t;
76
77static void unzip_skip(int fd, off_t skip)
78{
79 if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
80 if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
81 bb_error_msg_and_die("Seek failure");
82 }
83 }
84}
85
86static void unzip_read(int fd, void *buf, size_t count)
87{
88 if (bb_xread(fd, buf, count) != count) {
89 bb_error_msg_and_die(bb_msg_read_error);
90 }
91}
92
93static void unzip_create_leading_dirs(char *fn)
94{
95 /* Create all leading directories */
96 char *name = bb_xstrdup(fn);
97 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
98 bb_error_msg_and_die("Exiting"); /* bb_make_directory is noisy */
99 }
100 free(name);
101}
102
103static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
104{
105 if (zip_header->formated.method == 0) {
106 /* Method 0 - stored (not compressed) */
107 int size = zip_header->formated.ucmpsize;
108 if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
109 bb_error_msg_and_die("Cannot complete extraction");
110 }
111
112 } else {
113 /* Method 8 - inflate */
114 inflate_init(zip_header->formated.cmpsize);
115 inflate_unzip(src_fd, dst_fd);
116 inflate_cleanup();
117 /* Validate decompression - crc */
118 if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
119 bb_error_msg("Invalid compressed data--crc error");
120 return 1;
121 }
122 /* Validate decompression - size */
123 if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
124 bb_error_msg("Invalid compressed data--length error");
125 return 1;
126 }
127 }
128 return 0;
129}
130
131int unzip_main(int argc, char **argv)
132{
133 zip_header_t zip_header;
134 enum {v_silent, v_normal, v_list} verbosity = v_normal;
135 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
136 unsigned int total_size = 0;
137 unsigned int total_entries = 0;
138 int src_fd = -1, dst_fd = -1;
139 char *src_fn = NULL, *dst_fn = NULL;
140 llist_t *zaccept = NULL;
141 llist_t *zreject = NULL;
142 char *base_dir = NULL;
143 int failed, i, opt, opt_range = 0, list_header_done = 0;
144 char key_buf[512];
145 struct stat stat_buf;
146
147 while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
148 switch(opt_range) {
149 case 0: /* Options */
150 switch(opt) {
151 case 'l': /* List */
152 verbosity = v_list;
153 break;
154
155 case 'n': /* Never overwrite existing files */
156 overwrite = o_never;
157 break;
158
159 case 'o': /* Always overwrite existing files */
160 overwrite = o_always;
161 break;
162
163 case 'p': /* Extract files to stdout and fall through to set verbosity */
164 dst_fd = STDOUT_FILENO;
165
166 case 'q': /* Be quiet */
167 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
168 break;
169
170 case 1 : /* The zip file */
171 src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
172 opt_range++;
173 break;
174
175 default:
176 bb_show_usage();
177
178 }
179 break;
180
181 case 1: /* Include files */
182 if (opt == 1) {
183 llist_add_to(&zaccept, optarg);
184
185 } else if (opt == 'd') {
186 base_dir = optarg;
187 opt_range += 2;
188
189 } else if (opt == 'x') {
190 opt_range++;
191
192 } else {
193 bb_show_usage();
194 }
195 break;
196
197 case 2 : /* Exclude files */
198 if (opt == 1) {
199 llist_add_to(&zreject, optarg);
200
201 } else if (opt == 'd') { /* Extract to base directory */
202 base_dir = optarg;
203 opt_range++;
204
205 } else {
206 bb_show_usage();
207 }
208 break;
209
210 default:
211 bb_show_usage();
212 }
213 }
214
215 if (src_fn == NULL) {
216 bb_show_usage();
217 }
218
219 /* Open input file */
220 if (strcmp("-", src_fn) == 0) {
221 src_fd = STDIN_FILENO;
222 /* Cannot use prompt mode since zip data is arriving on STDIN */
223 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
224
225 } else {
226 static const char *const extn[] = {"", ".zip", ".ZIP"};
227 int orig_src_fn_len = strlen(src_fn);
228 for(i = 0; (i < 3) && (src_fd == -1); i++) {
229 strcpy(src_fn + orig_src_fn_len, extn[i]);
230 src_fd = open(src_fn, O_RDONLY);
231 }
232 if (src_fd == -1) {
233 src_fn[orig_src_fn_len] = 0;
234 bb_error_msg_and_die("Cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
235 }
236 }
237
238 /* Change dir if necessary */
239 if (base_dir)
240 bb_xchdir(base_dir);
241
242 if (verbosity != v_silent)
243 printf("Archive: %s\n", src_fn);
244
245 failed = 0;
246
247 while (1) {
248 unsigned int magic;
249
250 /* Check magic number */
251 unzip_read(src_fd, &magic, 4);
252 if (magic == ZIP_CDS_MAGIC) {
253 break;
254 } else if (magic != ZIP_FILEHEADER_MAGIC) {
255 bb_error_msg_and_die("Invalid zip magic %08X", magic);
256 }
257
258 /* Read the file header */
259 unzip_read(src_fd, zip_header.raw, 26);
260#if BB_BIG_ENDIAN
261 zip_header.formated.version = __swap16(zip_header.formated.version);
262 zip_header.formated.flags = __swap16(zip_header.formated.flags);
263 zip_header.formated.method = __swap16(zip_header.formated.method);
264 zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
265 zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
266 zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
267 zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
268 zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
269 zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
270 zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
271#endif /* BB_BIG_ENDIAN */
272 if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
273 bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
274 }
275
276 /* Read filename */
277 free(dst_fn);
278 dst_fn = xzalloc(zip_header.formated.filename_len + 1);
279 unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
280
281 /* Skip extra header bytes */
282 unzip_skip(src_fd, zip_header.formated.extra_len);
283
284 if ((verbosity == v_list) && !list_header_done){
285 printf(" Length Date Time Name\n"
286 " -------- ---- ---- ----\n");
287 list_header_done = 1;
288 }
289
290 /* Filter zip entries */
291 if (find_list_entry(zreject, dst_fn) ||
292 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
293 i = 'n';
294
295 } else { /* Extract entry */
296 total_size += zip_header.formated.ucmpsize;
297
298 if (verbosity == v_list) { /* List entry */
299 unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
300 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
301 zip_header.formated.ucmpsize,
302 (dostime & 0x01e00000) >> 21,
303 (dostime & 0x001f0000) >> 16,
304 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
305 (dostime & 0x0000f800) >> 11,
306 (dostime & 0x000007e0) >> 5,
307 dst_fn);
308 total_entries++;
309 i = 'n';
310
311 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
312 i = -1;
313
314 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
315 if (stat(dst_fn, &stat_buf) == -1) {
316 if (errno != ENOENT) {
317 bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
318 }
319 if (verbosity == v_normal) {
320 printf(" creating: %s\n", dst_fn);
321 }
322 unzip_create_leading_dirs(dst_fn);
323 if (bb_make_directory(dst_fn, 0777, 0)) {
324 bb_error_msg_and_die("Exiting");
325 }
326 } else {
327 if (!S_ISDIR(stat_buf.st_mode)) {
328 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
329 }
330 }
331 i = 'n';
332
333 } else { /* Extract file */
334 _check_file:
335 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
336 if (errno != ENOENT) {
337 bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
338 }
339 i = 'y';
340
341 } else { /* File already exists */
342 if (overwrite == o_never) {
343 i = 'n';
344
345 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
346 if (overwrite == o_always) {
347 i = 'y';
348 } else {
349 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
350 if (!fgets(key_buf, 512, stdin)) {
351 bb_perror_msg_and_die("Cannot read input");
352 }
353 i = key_buf[0];
354 }
355
356 } else { /* File is not regular file */
357 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
358 }
359 }
360 }
361 }
362
363 switch (i) {
364 case 'A':
365 overwrite = o_always;
366 case 'y': /* Open file and fall into unzip */
367 unzip_create_leading_dirs(dst_fn);
368 dst_fd = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
369 case -1: /* Unzip */
370 if (verbosity == v_normal) {
371 printf(" inflating: %s\n", dst_fn);
372 }
373 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
374 failed = 1;
375 }
376 if (dst_fd != STDOUT_FILENO) {
377 /* closing STDOUT is potentially bad for future business */
378 close(dst_fd);
379 }
380 break;
381
382 case 'N':
383 overwrite = o_never;
384 case 'n':
385 /* Skip entry data */
386 unzip_skip(src_fd, zip_header.formated.cmpsize);
387 break;
388
389 case 'r':
390 /* Prompt for new name */
391 printf("new name: ");
392 if (!fgets(key_buf, 512, stdin)) {
393 bb_perror_msg_and_die("Cannot read input");
394 }
395 free(dst_fn);
396 dst_fn = bb_xstrdup(key_buf);
397 chomp(dst_fn);
398 goto _check_file;
399
400 default:
401 printf("error: invalid response [%c]\n",(char)i);
402 goto _check_file;
403 }
404
405 /* Data descriptor section */
406 if (zip_header.formated.flags & 4) {
407 /* skip over duplicate crc, compressed size and uncompressed size */
408 unzip_skip(src_fd, 12);
409 }
410 }
411
412 if (verbosity == v_list) {
413 printf(" -------- -------\n"
414 "%9d %d files\n", total_size, total_entries);
415 }
416
417 return failed;
418}
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