source: MondoRescue/branches/2.2.9/mindi-busybox/archival/unzip.c@ 2142

Last change on this file since 2142 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 10.2 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 "libbb.h"
28#include "unarchive.h"
29
30#define ZIP_FILEHEADER_MAGIC SWAP_LE32(0x04034b50)
31#define ZIP_CDS_MAGIC SWAP_LE32(0x02014b50)
32#define ZIP_CDS_END_MAGIC SWAP_LE32(0x06054b50)
33#define ZIP_DD_MAGIC SWAP_LE32(0x08074b50)
34
35typedef union {
36 unsigned char raw[26];
37 struct {
38 unsigned short version; /* 0-1 */
39 unsigned short flags; /* 2-3 */
40 unsigned short method; /* 4-5 */
41 unsigned short modtime; /* 6-7 */
42 unsigned short moddate; /* 8-9 */
43 unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
44 unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
45 unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
46 unsigned short filename_len; /* 22-23 */
47 unsigned short extra_len; /* 24-25 */
48 } formatted ATTRIBUTE_PACKED;
49} zip_header_t;
50
51static void unzip_skip(int fd, off_t skip)
52{
53 if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
54 if (errno != ESPIPE)
55 bb_error_msg_and_die("seek failure");
56 bb_copyfd_exact_size(fd, -1, skip);
57 }
58}
59
60static void unzip_create_leading_dirs(char *fn)
61{
62 /* Create all leading directories */
63 char *name = xstrdup(fn);
64 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
65 bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
66 }
67 free(name);
68}
69
70static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
71{
72 if (zip_header->formatted.method == 0) {
73 /* Method 0 - stored (not compressed) */
74 off_t size = zip_header->formatted.ucmpsize;
75 if (size)
76 bb_copyfd_exact_size(src_fd, dst_fd, size);
77 } else {
78 /* Method 8 - inflate */
79 inflate_unzip_result res;
80 /* err = */ inflate_unzip(&res, zip_header->formatted.cmpsize, src_fd, dst_fd);
81// we should check for -1 error return
82 /* Validate decompression - crc */
83 if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
84 bb_error_msg("invalid compressed data--%s error", "crc");
85 return 1;
86 }
87 /* Validate decompression - size */
88 if (zip_header->formatted.ucmpsize != res.bytes_out) {
89 bb_error_msg("invalid compressed data--%s error", "length");
90 return 1;
91 }
92 }
93 return 0;
94}
95
96int unzip_main(int argc, char **argv);
97int unzip_main(int argc, char **argv)
98{
99 zip_header_t zip_header;
100 enum {v_silent, v_normal, v_list} verbosity = v_normal;
101 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
102 unsigned int total_size = 0;
103 unsigned int total_entries = 0;
104 int src_fd = -1, dst_fd = -1;
105 char *src_fn = NULL, *dst_fn = NULL;
106 llist_t *zaccept = NULL;
107 llist_t *zreject = NULL;
108 char *base_dir = NULL;
109 int failed, i, opt, opt_range = 0, list_header_done = 0;
110 char key_buf[512];
111 struct stat stat_buf;
112
113 while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
114 switch (opt_range) {
115 case 0: /* Options */
116 switch (opt) {
117 case 'l': /* List */
118 verbosity = v_list;
119 break;
120
121 case 'n': /* Never overwrite existing files */
122 overwrite = o_never;
123 break;
124
125 case 'o': /* Always overwrite existing files */
126 overwrite = o_always;
127 break;
128
129 case 'p': /* Extract files to stdout and fall through to set verbosity */
130 dst_fd = STDOUT_FILENO;
131
132 case 'q': /* Be quiet */
133 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
134 break;
135
136 case 1 : /* The zip file */
137 src_fn = xmalloc(strlen(optarg)+4);
138 strcpy(src_fn, optarg);
139 opt_range++;
140 break;
141
142 default:
143 bb_show_usage();
144
145 }
146 break;
147
148 case 1: /* Include files */
149 if (opt == 1) {
150 llist_add_to(&zaccept, optarg);
151
152 } else if (opt == 'd') {
153 base_dir = optarg;
154 opt_range += 2;
155
156 } else if (opt == 'x') {
157 opt_range++;
158
159 } else {
160 bb_show_usage();
161 }
162 break;
163
164 case 2 : /* Exclude files */
165 if (opt == 1) {
166 llist_add_to(&zreject, optarg);
167
168 } else if (opt == 'd') { /* Extract to base directory */
169 base_dir = optarg;
170 opt_range++;
171
172 } else {
173 bb_show_usage();
174 }
175 break;
176
177 default:
178 bb_show_usage();
179 }
180 }
181
182 if (src_fn == NULL) {
183 bb_show_usage();
184 }
185
186 /* Open input file */
187 if (LONE_DASH(src_fn)) {
188 src_fd = STDIN_FILENO;
189 /* Cannot use prompt mode since zip data is arriving on STDIN */
190 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
191 } else {
192 static const char *const extn[] = {"", ".zip", ".ZIP"};
193 int orig_src_fn_len = strlen(src_fn);
194 for (i = 0; (i < 3) && (src_fd == -1); i++) {
195 strcpy(src_fn + orig_src_fn_len, extn[i]);
196 src_fd = open(src_fn, O_RDONLY);
197 }
198 if (src_fd == -1) {
199 src_fn[orig_src_fn_len] = '\0';
200 bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
201 }
202 }
203
204 /* Change dir if necessary */
205 if (base_dir)
206 xchdir(base_dir);
207
208 if (verbosity != v_silent)
209 printf("Archive: %s\n", src_fn);
210
211 failed = 0;
212
213 while (1) {
214 unsigned int magic;
215
216 /* Check magic number */
217 xread(src_fd, &magic, 4);
218 if (magic == ZIP_CDS_MAGIC) {
219 break;
220 } else if (magic != ZIP_FILEHEADER_MAGIC) {
221 bb_error_msg_and_die("invalid zip magic %08X", magic);
222 }
223
224 /* Read the file header */
225 xread(src_fd, zip_header.raw, 26);
226 zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
227 zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
228 zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
229 zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
230 zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
231 zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
232 zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
233 zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
234 zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
235 zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
236 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
237 bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
238 }
239
240 /* Read filename */
241 free(dst_fn);
242 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
243 xread(src_fd, dst_fn, zip_header.formatted.filename_len);
244
245 /* Skip extra header bytes */
246 unzip_skip(src_fd, zip_header.formatted.extra_len);
247
248 if ((verbosity == v_list) && !list_header_done){
249 puts(" Length Date Time Name\n"
250 " -------- ---- ---- ----");
251 list_header_done = 1;
252 }
253
254 /* Filter zip entries */
255 if (find_list_entry(zreject, dst_fn) ||
256 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
257 i = 'n';
258
259 } else { /* Extract entry */
260 total_size += zip_header.formatted.ucmpsize;
261
262 if (verbosity == v_list) { /* List entry */
263 unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
264 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
265 zip_header.formatted.ucmpsize,
266 (dostime & 0x01e00000) >> 21,
267 (dostime & 0x001f0000) >> 16,
268 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
269 (dostime & 0x0000f800) >> 11,
270 (dostime & 0x000007e0) >> 5,
271 dst_fn);
272 total_entries++;
273 i = 'n';
274 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
275 i = -1;
276 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
277 if (stat(dst_fn, &stat_buf) == -1) {
278 if (errno != ENOENT) {
279 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
280 }
281 if (verbosity == v_normal) {
282 printf(" creating: %s\n", dst_fn);
283 }
284 unzip_create_leading_dirs(dst_fn);
285 if (bb_make_directory(dst_fn, 0777, 0)) {
286 bb_error_msg_and_die("exiting");
287 }
288 } else {
289 if (!S_ISDIR(stat_buf.st_mode)) {
290 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
291 }
292 }
293 i = 'n';
294
295 } else { /* Extract file */
296 _check_file:
297 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
298 if (errno != ENOENT) {
299 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
300 }
301 i = 'y';
302 } else { /* File already exists */
303 if (overwrite == o_never) {
304 i = 'n';
305 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
306 if (overwrite == o_always) {
307 i = 'y';
308 } else {
309 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
310 if (!fgets(key_buf, 512, stdin)) {
311 bb_perror_msg_and_die("cannot read input");
312 }
313 i = key_buf[0];
314 }
315 } else { /* File is not regular file */
316 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
317 }
318 }
319 }
320 }
321
322 switch (i) {
323 case 'A':
324 overwrite = o_always;
325 case 'y': /* Open file and fall into unzip */
326 unzip_create_leading_dirs(dst_fn);
327 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
328 case -1: /* Unzip */
329 if (verbosity == v_normal) {
330 printf(" inflating: %s\n", dst_fn);
331 }
332 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
333 failed = 1;
334 }
335 if (dst_fd != STDOUT_FILENO) {
336 /* closing STDOUT is potentially bad for future business */
337 close(dst_fd);
338 }
339 break;
340
341 case 'N':
342 overwrite = o_never;
343 case 'n':
344 /* Skip entry data */
345 unzip_skip(src_fd, zip_header.formatted.cmpsize);
346 break;
347
348 case 'r':
349 /* Prompt for new name */
350 printf("new name: ");
351 if (!fgets(key_buf, 512, stdin)) {
352 bb_perror_msg_and_die("cannot read input");
353 }
354 free(dst_fn);
355 dst_fn = xstrdup(key_buf);
356 chomp(dst_fn);
357 goto _check_file;
358
359 default:
360 printf("error: invalid response [%c]\n",(char)i);
361 goto _check_file;
362 }
363
364 /* Data descriptor section */
365 if (zip_header.formatted.flags & 4) {
366 /* skip over duplicate crc, compressed size and uncompressed size */
367 unzip_skip(src_fd, 12);
368 }
369 }
370
371 if (verbosity == v_list) {
372 printf(" -------- -------\n"
373 "%9d %d files\n", total_size, total_entries);
374 }
375
376 return failed;
377}
Note: See TracBrowser for help on using the repository browser.