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)
36 unsigned char raw[26];
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;
51 static void unzip_skip(int fd, off_t skip)
53 if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
55 bb_error_msg_and_die("seek failure");
56 bb_copyfd_exact_size(fd, -1, skip);
60 static void unzip_create_leading_dirs(char *fn)
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 */
70 static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
72 if (zip_header->formatted.method == 0) {
73 /* Method 0 - stored (not compressed) */
74 off_t size = zip_header->formatted.ucmpsize;
76 bb_copyfd_exact_size(src_fd, dst_fd, size);
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");
87 /* Validate decompression - size */
88 if (zip_header->formatted.ucmpsize != res.bytes_out) {
89 bb_error_msg("invalid compressed data--%s error", "length");
96 int unzip_main(int argc, char **argv);
97 int unzip_main(int argc, char **argv)
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;
111 struct stat stat_buf;
113 while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
115 case 0: /* Options */
121 case 'n': /* Never overwrite existing files */
125 case 'o': /* Always overwrite existing files */
126 overwrite = o_always;
129 case 'p': /* Extract files to stdout and fall through to set verbosity */
130 dst_fd = STDOUT_FILENO;
132 case 'q': /* Be quiet */
133 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
136 case 1 : /* The zip file */
137 src_fn = xstrndup(optarg, strlen(optarg)+4);
147 case 1: /* Include files */
149 llist_add_to(&zaccept, optarg);
151 } else if (opt == 'd') {
155 } else if (opt == 'x') {
163 case 2 : /* Exclude files */
165 llist_add_to(&zreject, optarg);
167 } else if (opt == 'd') { /* Extract to base directory */
181 if (src_fn == NULL) {
185 /* Open input file */
186 if (LONE_DASH(src_fn)) {
187 src_fd = STDIN_FILENO;
188 /* Cannot use prompt mode since zip data is arriving on STDIN */
189 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
191 static const char *const extn[] = {"", ".zip", ".ZIP"};
192 int orig_src_fn_len = strlen(src_fn);
193 for (i = 0; (i < 3) && (src_fd == -1); i++) {
194 strcpy(src_fn + orig_src_fn_len, extn[i]);
195 src_fd = open(src_fn, O_RDONLY);
198 src_fn[orig_src_fn_len] = 0;
199 bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
203 /* Change dir if necessary */
207 if (verbosity != v_silent)
208 printf("Archive: %s\n", src_fn);
215 /* Check magic number */
216 xread(src_fd, &magic, 4);
217 if (magic == ZIP_CDS_MAGIC) {
219 } else if (magic != ZIP_FILEHEADER_MAGIC) {
220 bb_error_msg_and_die("invalid zip magic %08X", magic);
223 /* Read the file header */
224 xread(src_fd, zip_header.raw, 26);
225 zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
226 zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
227 zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
228 zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
229 zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
230 zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
231 zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
232 zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
233 zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
234 zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
235 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
236 bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
241 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
242 xread(src_fd, dst_fn, zip_header.formatted.filename_len);
244 /* Skip extra header bytes */
245 unzip_skip(src_fd, zip_header.formatted.extra_len);
247 if ((verbosity == v_list) && !list_header_done){
248 puts(" Length Date Time Name\n"
249 " -------- ---- ---- ----");
250 list_header_done = 1;
253 /* Filter zip entries */
254 if (find_list_entry(zreject, dst_fn) ||
255 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
258 } else { /* Extract entry */
259 total_size += zip_header.formatted.ucmpsize;
261 if (verbosity == v_list) { /* List entry */
262 unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
263 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
264 zip_header.formatted.ucmpsize,
265 (dostime & 0x01e00000) >> 21,
266 (dostime & 0x001f0000) >> 16,
267 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
268 (dostime & 0x0000f800) >> 11,
269 (dostime & 0x000007e0) >> 5,
273 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
275 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
276 if (stat(dst_fn, &stat_buf) == -1) {
277 if (errno != ENOENT) {
278 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
280 if (verbosity == v_normal) {
281 printf(" creating: %s\n", dst_fn);
283 unzip_create_leading_dirs(dst_fn);
284 if (bb_make_directory(dst_fn, 0777, 0)) {
285 bb_error_msg_and_die("exiting");
288 if (!S_ISDIR(stat_buf.st_mode)) {
289 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
294 } else { /* Extract file */
296 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
297 if (errno != ENOENT) {
298 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
301 } else { /* File already exists */
302 if (overwrite == o_never) {
304 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
305 if (overwrite == o_always) {
308 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
309 if (!fgets(key_buf, 512, stdin)) {
310 bb_perror_msg_and_die("cannot read input");
314 } else { /* File is not regular file */
315 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
323 overwrite = o_always;
324 case 'y': /* Open file and fall into unzip */
325 unzip_create_leading_dirs(dst_fn);
326 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
328 if (verbosity == v_normal) {
329 printf(" inflating: %s\n", dst_fn);
331 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
334 if (dst_fd != STDOUT_FILENO) {
335 /* closing STDOUT is potentially bad for future business */
343 /* Skip entry data */
344 unzip_skip(src_fd, zip_header.formatted.cmpsize);
348 /* Prompt for new name */
349 printf("new name: ");
350 if (!fgets(key_buf, 512, stdin)) {
351 bb_perror_msg_and_die("cannot read input");
354 dst_fn = xstrdup(key_buf);
359 printf("error: invalid response [%c]\n",(char)i);
363 /* Data descriptor section */
364 if (zip_header.formatted.flags & 4) {
365 /* skip over duplicate crc, compressed size and uncompressed size */
366 unzip_skip(src_fd, 12);
370 if (verbosity == v_list) {
371 printf(" -------- -------\n"
372 "%9d %d files\n", total_size, total_entries);