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 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
14 * http://www.pkware.com/company/standards/appnote/
15 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
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.
28 #include "unarchive.h"
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)
35 extern unsigned int gunzip_crc;
36 extern unsigned int gunzip_bytes_out;
39 unsigned char raw[26];
41 unsigned short version; /* 0-1 */
42 unsigned short flags; /* 2-3 */
43 unsigned short method; /* 4-5 */
44 unsigned short modtime; /* 6-7 */
45 unsigned short moddate; /* 8-9 */
46 unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
47 unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
48 unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
49 unsigned short filename_len; /* 22-23 */
50 unsigned short extra_len; /* 24-25 */
51 } formatted ATTRIBUTE_PACKED;
54 static void unzip_skip(int fd, off_t skip)
56 if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
58 bb_error_msg_and_die("seek failure");
59 bb_copyfd_exact_size(fd, -1, skip);
63 static void unzip_create_leading_dirs(char *fn)
65 /* Create all leading directories */
66 char *name = xstrdup(fn);
67 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
68 bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
73 static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
75 if (zip_header->formatted.method == 0) {
76 /* Method 0 - stored (not compressed) */
77 off_t size = zip_header->formatted.ucmpsize;
79 bb_copyfd_exact_size(src_fd, dst_fd, size);
81 /* Method 8 - inflate */
82 inflate_init(zip_header->formatted.cmpsize);
83 inflate_unzip(src_fd, dst_fd);
85 /* Validate decompression - crc */
86 if (zip_header->formatted.crc32 != (gunzip_crc ^ 0xffffffffL)) {
87 bb_error_msg("invalid compressed data--%s error", "crc");
90 /* Validate decompression - size */
91 if (zip_header->formatted.ucmpsize != gunzip_bytes_out) {
92 bb_error_msg("invalid compressed data--%s error", "length");
99 int unzip_main(int argc, char **argv)
101 zip_header_t zip_header;
102 enum {v_silent, v_normal, v_list} verbosity = v_normal;
103 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
104 unsigned int total_size = 0;
105 unsigned int total_entries = 0;
106 int src_fd = -1, dst_fd = -1;
107 char *src_fn = NULL, *dst_fn = NULL;
108 llist_t *zaccept = NULL;
109 llist_t *zreject = NULL;
110 char *base_dir = NULL;
111 int failed, i, opt, opt_range = 0, list_header_done = 0;
113 struct stat stat_buf;
115 while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
117 case 0: /* Options */
123 case 'n': /* Never overwrite existing files */
127 case 'o': /* Always overwrite existing files */
128 overwrite = o_always;
131 case 'p': /* Extract files to stdout and fall through to set verbosity */
132 dst_fd = STDOUT_FILENO;
134 case 'q': /* Be quiet */
135 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
138 case 1 : /* The zip file */
139 src_fn = xstrndup(optarg, strlen(optarg)+4);
149 case 1: /* Include files */
151 llist_add_to(&zaccept, optarg);
153 } else if (opt == 'd') {
157 } else if (opt == 'x') {
165 case 2 : /* Exclude files */
167 llist_add_to(&zreject, optarg);
169 } else if (opt == 'd') { /* Extract to base directory */
183 if (src_fn == NULL) {
187 /* Open input file */
188 if (LONE_DASH(src_fn)) {
189 src_fd = STDIN_FILENO;
190 /* Cannot use prompt mode since zip data is arriving on STDIN */
191 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
193 static const char *const extn[] = {"", ".zip", ".ZIP"};
194 int orig_src_fn_len = strlen(src_fn);
195 for(i = 0; (i < 3) && (src_fd == -1); i++) {
196 strcpy(src_fn + orig_src_fn_len, extn[i]);
197 src_fd = open(src_fn, O_RDONLY);
200 src_fn[orig_src_fn_len] = 0;
201 bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
205 /* Change dir if necessary */
209 if (verbosity != v_silent)
210 printf("Archive: %s\n", src_fn);
217 /* Check magic number */
218 xread(src_fd, &magic, 4);
219 if (magic == ZIP_CDS_MAGIC) {
221 } else if (magic != ZIP_FILEHEADER_MAGIC) {
222 bb_error_msg_and_die("invalid zip magic %08X", magic);
225 /* Read the file header */
226 xread(src_fd, zip_header.raw, 26);
227 zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
228 zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
229 zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
230 zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
231 zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
232 zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
233 zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
234 zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
235 zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
236 zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
237 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
238 bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
243 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
244 xread(src_fd, dst_fn, zip_header.formatted.filename_len);
246 /* Skip extra header bytes */
247 unzip_skip(src_fd, zip_header.formatted.extra_len);
249 if ((verbosity == v_list) && !list_header_done){
250 puts(" Length Date Time Name\n"
251 " -------- ---- ---- ----");
252 list_header_done = 1;
255 /* Filter zip entries */
256 if (find_list_entry(zreject, dst_fn) ||
257 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
260 } else { /* Extract entry */
261 total_size += zip_header.formatted.ucmpsize;
263 if (verbosity == v_list) { /* List entry */
264 unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
265 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
266 zip_header.formatted.ucmpsize,
267 (dostime & 0x01e00000) >> 21,
268 (dostime & 0x001f0000) >> 16,
269 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
270 (dostime & 0x0000f800) >> 11,
271 (dostime & 0x000007e0) >> 5,
275 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
277 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
278 if (stat(dst_fn, &stat_buf) == -1) {
279 if (errno != ENOENT) {
280 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
282 if (verbosity == v_normal) {
283 printf(" creating: %s\n", dst_fn);
285 unzip_create_leading_dirs(dst_fn);
286 if (bb_make_directory(dst_fn, 0777, 0)) {
287 bb_error_msg_and_die("exiting");
290 if (!S_ISDIR(stat_buf.st_mode)) {
291 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
296 } else { /* Extract file */
298 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
299 if (errno != ENOENT) {
300 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
303 } else { /* File already exists */
304 if (overwrite == o_never) {
306 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
307 if (overwrite == o_always) {
310 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
311 if (!fgets(key_buf, 512, stdin)) {
312 bb_perror_msg_and_die("cannot read input");
316 } else { /* File is not regular file */
317 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
325 overwrite = o_always;
326 case 'y': /* Open file and fall into unzip */
327 unzip_create_leading_dirs(dst_fn);
328 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
330 if (verbosity == v_normal) {
331 printf(" inflating: %s\n", dst_fn);
333 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
336 if (dst_fd != STDOUT_FILENO) {
337 /* closing STDOUT is potentially bad for future business */
345 /* Skip entry data */
346 unzip_skip(src_fd, zip_header.formatted.cmpsize);
350 /* Prompt for new name */
351 printf("new name: ");
352 if (!fgets(key_buf, 512, stdin)) {
353 bb_perror_msg_and_die("cannot read input");
356 dst_fn = xstrdup(key_buf);
361 printf("error: invalid response [%c]\n",(char)i);
365 /* Data descriptor section */
366 if (zip_header.formatted.flags & 4) {
367 /* skip over duplicate crc, compressed size and uncompressed size */
368 unzip_skip(src_fd, 12);
372 if (verbosity == v_list) {
373 printf(" -------- -------\n"
374 "%9d %d files\n", total_size, total_entries);