1 /* vi: set sw=4 ts=4: */
3 * Mini unzip implementation for busybox
5 * Copyright (C) 2004 by Ed Clark
7 * Loosely based on original busybox unzip applet by Laurence Anderson.
8 * All options and features should work in this version.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 * http://www.pkware.com/company/standards/appnote/
28 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
33 * Zip64 + other methods
34 * Improve handling of zip format, ie.
35 * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
36 * - unix file permissions, etc.
46 #include "unarchive.h"
49 #if (BYTE_ORDER == BIG_ENDIAN)
50 static inline unsigned short
51 __swap16(unsigned short x) {
52 return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
55 static inline uint32_t
56 __swap32(uint32_t x) {
57 return (((x & 0xFF) << 24) |
59 ((x & 0xFF0000) >> 8) |
60 ((x & 0xFF000000) >> 24));
63 #define __swap16(x) (x)
64 #define __swap32(x) (x)
67 #define ZIP_FILEHEADER_MAGIC __swap32(0x04034b50)
68 #define ZIP_CDS_MAGIC __swap32(0x02014b50)
69 #define ZIP_CDS_END_MAGIC __swap32(0x06054b50)
70 #define ZIP_DD_MAGIC __swap32(0x08074b50)
72 extern unsigned int gunzip_crc;
73 extern unsigned int gunzip_bytes_out;
76 unsigned char raw[26];
78 unsigned short version; /* 0-1 */
79 unsigned short flags; /* 2-3 */
80 unsigned short method; /* 4-5 */
81 unsigned short modtime; /* 6-7 */
82 unsigned short moddate; /* 8-9 */
83 unsigned int crc32 __attribute__ ((packed)); /* 10-13 */
84 unsigned int cmpsize __attribute__ ((packed)); /* 14-17 */
85 unsigned int ucmpsize __attribute__ ((packed)); /* 18-21 */
86 unsigned short filename_len; /* 22-23 */
87 unsigned short extra_len; /* 24-25 */
88 } formated __attribute__ ((packed));
91 static void unzip_skip(int fd, off_t skip)
93 if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
94 if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
95 bb_error_msg_and_die("Seek failure");
100 static void unzip_read(int fd, void *buf, size_t count)
102 if (bb_xread(fd, buf, count) != count) {
103 bb_error_msg_and_die("Read failure");
107 static void unzip_create_leading_dirs(char *fn)
109 /* Create all leading directories */
110 char *name = bb_xstrdup(fn);
111 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
112 bb_error_msg_and_die("Failed to create directory");
117 static void unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
119 if (zip_header->formated.method == 0) {
120 /* Method 0 - stored (not compressed) */
121 int size = zip_header->formated.ucmpsize;
122 if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
123 bb_error_msg_and_die("Cannot complete extraction");
127 /* Method 8 - inflate */
128 inflate_init(zip_header->formated.cmpsize);
129 inflate_unzip(src_fd, dst_fd);
131 /* Validate decompression - crc */
132 if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
133 bb_error_msg("Invalid compressed data--crc error");
135 /* Validate decompression - size */
136 if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
137 bb_error_msg("Invalid compressed data--length error");
142 extern int unzip_main(int argc, char **argv)
144 zip_header_t zip_header;
145 enum {v_silent, v_normal, v_list} verbosity = v_normal;
146 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
147 unsigned int total_size = 0;
148 unsigned int total_entries = 0;
149 int src_fd = -1, dst_fd = -1;
150 char *src_fn = NULL, *dst_fn = NULL;
151 llist_t *accept = NULL;
152 llist_t *reject = NULL;
153 char *base_dir = NULL;
154 int i, opt, opt_range = 0, list_header_done = 0;
156 struct stat stat_buf;
158 while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
160 case 0: /* Options */
166 case 'n': /* Never overwrite existing files */
170 case 'o': /* Always overwrite existing files */
171 overwrite = o_always;
174 case 'p': /* Extract files to stdout and fall through to set verbosity */
175 dst_fd = STDOUT_FILENO;
177 case 'q': /* Be quiet */
178 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
181 case 1 : /* The zip file */
182 src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
192 case 1: /* Include files */
194 accept = llist_add_to(accept, optarg);
196 } else if (opt == 'd') {
200 } else if (opt == 'x') {
208 case 2 : /* Exclude files */
210 reject = llist_add_to(reject, optarg);
212 } else if (opt == 'd') { /* Extract to base directory */
226 if (src_fn == NULL) {
230 /* Open input file */
231 if (strcmp("-", src_fn) == 0) {
232 src_fd = STDIN_FILENO;
233 /* Cannot use prompt mode since zip data is arriving on STDIN */
234 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
237 char *extn[] = {"", ".zip", ".ZIP"};
238 int orig_src_fn_len = strlen(src_fn);
239 for(i = 0; (i < 3) && (src_fd == -1); i++) {
240 strcpy(src_fn + orig_src_fn_len, extn[i]);
241 src_fd = open(src_fn, O_RDONLY);
244 src_fn[orig_src_fn_len] = 0;
245 bb_error_msg_and_die("Cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
249 /* Change dir if necessary */
250 if (base_dir && chdir(base_dir)) {
251 bb_perror_msg_and_die("Cannot chdir");
254 if (verbosity != v_silent)
255 printf("Archive: %s\n", src_fn);
260 /* Check magic number */
261 unzip_read(src_fd, &magic, 4);
262 if (magic == ZIP_CDS_MAGIC) {
264 } else if (magic != ZIP_FILEHEADER_MAGIC) {
265 bb_error_msg_and_die("Invalid zip magic %08X", magic);
268 /* Read the file header */
269 unzip_read(src_fd, zip_header.raw, 26);
270 #if (BYTE_ORDER == BIG_ENDIAN)
271 zip_header.formated.version = __swap16(zip_header.formated.version);
272 zip_header.formated.flags = __swap16(zip_header.formated.flags);
273 zip_header.formated.method = __swap16(zip_header.formated.method);
274 zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
275 zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
276 zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
277 zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
278 zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
279 zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
280 zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
282 if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
283 bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
288 dst_fn = xmalloc(zip_header.formated.filename_len + 1);
289 unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
290 dst_fn[zip_header.formated.filename_len] = 0;
292 /* Skip extra header bytes */
293 unzip_skip(src_fd, zip_header.formated.extra_len);
295 if ((verbosity == v_list) && !list_header_done){
296 printf(" Length Date Time Name\n");
297 printf(" -------- ---- ---- ----\n");
298 list_header_done = 1;
301 /* Filter zip entries */
302 if (find_list_entry(reject, dst_fn) ||
303 (accept && !find_list_entry(accept, dst_fn))) { /* Skip entry */
306 } else { /* Extract entry */
307 total_size += zip_header.formated.ucmpsize;
309 if (verbosity == v_list) { /* List entry */
310 unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
311 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
312 zip_header.formated.ucmpsize,
313 (dostime & 0x01e00000) >> 21,
314 (dostime & 0x001f0000) >> 16,
315 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
316 (dostime & 0x0000f800) >> 11,
317 (dostime & 0x000007e0) >> 5,
322 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
325 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
326 if (stat(dst_fn, &stat_buf) == -1) {
327 if (errno != ENOENT) {
328 bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
330 if (verbosity == v_normal) {
331 printf(" creating: %s\n", dst_fn);
333 unzip_create_leading_dirs(dst_fn);
334 if (bb_make_directory(dst_fn, 0777, 0)) {
335 bb_error_msg_and_die("Failed to create directory");
338 if (!S_ISDIR(stat_buf.st_mode)) {
339 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
344 } else { /* Extract file */
346 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
347 if (errno != ENOENT) {
348 bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
352 } else { /* File already exists */
353 if (overwrite == o_never) {
356 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
357 if (overwrite == o_always) {
360 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
361 if (!fgets(key_buf, 512, stdin)) {
362 bb_perror_msg_and_die("Cannot read input");
367 } else { /* File is not regular file */
368 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
376 overwrite = o_always;
377 case 'y': /* Open file and fall into unzip */
378 unzip_create_leading_dirs(dst_fn);
379 dst_fd = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
381 if (verbosity == v_normal) {
382 printf(" inflating: %s\n", dst_fn);
384 unzip_extract(&zip_header, src_fd, dst_fd);
385 if (dst_fd != STDOUT_FILENO) {
386 /* closing STDOUT is potentially bad for future business */
394 /* Skip entry data */
395 unzip_skip(src_fd, zip_header.formated.cmpsize);
399 /* Prompt for new name */
400 printf("new name: ");
401 if (!fgets(key_buf, 512, stdin)) {
402 bb_perror_msg_and_die("Cannot read input");
405 dst_fn = bb_xstrdup(key_buf);
410 printf("error: invalid response [%c]\n",(char)i);
414 /* Data descriptor section */
415 if (zip_header.formated.flags & 4) {
416 /* skip over duplicate crc, compressed size and uncompressed size */
417 unzip_skip(src_fd, 12);
421 if (verbosity == v_list) {
422 printf(" -------- -------\n");
423 printf("%9d %d files\n", total_size, total_entries);
426 return(EXIT_SUCCESS);
432 c-file-style: "linux"