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)
98 zip_header_t zip_header;
99 enum {v_silent, v_normal, v_list} verbosity = v_normal;
100 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
101 unsigned int total_size = 0;
102 unsigned int total_entries = 0;
103 int src_fd = -1, dst_fd = -1;
104 char *src_fn = NULL, *dst_fn = NULL;
105 llist_t *zaccept = NULL;
106 llist_t *zreject = NULL;
107 char *base_dir = NULL;
108 int failed, i, opt, opt_range = 0, list_header_done = 0;
110 struct stat stat_buf;
112 while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
114 case 0: /* Options */
120 case 'n': /* Never overwrite existing files */
124 case 'o': /* Always overwrite existing files */
125 overwrite = o_always;
128 case 'p': /* Extract files to stdout and fall through to set verbosity */
129 dst_fd = STDOUT_FILENO;
131 case 'q': /* Be quiet */
132 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
135 case 1 : /* The zip file */
136 src_fn = xstrndup(optarg, strlen(optarg)+4);
146 case 1: /* Include files */
148 llist_add_to(&zaccept, optarg);
150 } else if (opt == 'd') {
154 } else if (opt == 'x') {
162 case 2 : /* Exclude files */
164 llist_add_to(&zreject, optarg);
166 } else if (opt == 'd') { /* Extract to base directory */
180 if (src_fn == NULL) {
184 /* Open input file */
185 if (LONE_DASH(src_fn)) {
186 src_fd = STDIN_FILENO;
187 /* Cannot use prompt mode since zip data is arriving on STDIN */
188 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
190 static const char *const extn[] = {"", ".zip", ".ZIP"};
191 int orig_src_fn_len = strlen(src_fn);
192 for (i = 0; (i < 3) && (src_fd == -1); i++) {
193 strcpy(src_fn + orig_src_fn_len, extn[i]);
194 src_fd = open(src_fn, O_RDONLY);
197 src_fn[orig_src_fn_len] = 0;
198 bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
202 /* Change dir if necessary */
206 if (verbosity != v_silent)
207 printf("Archive: %s\n", src_fn);
214 /* Check magic number */
215 xread(src_fd, &magic, 4);
216 if (magic == ZIP_CDS_MAGIC) {
218 } else if (magic != ZIP_FILEHEADER_MAGIC) {
219 bb_error_msg_and_die("invalid zip magic %08X", magic);
222 /* Read the file header */
223 xread(src_fd, zip_header.raw, 26);
224 zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
225 zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
226 zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
227 zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
228 zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
229 zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
230 zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
231 zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
232 zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
233 zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
234 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
235 bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
240 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
241 xread(src_fd, dst_fn, zip_header.formatted.filename_len);
243 /* Skip extra header bytes */
244 unzip_skip(src_fd, zip_header.formatted.extra_len);
246 if ((verbosity == v_list) && !list_header_done){
247 puts(" Length Date Time Name\n"
248 " -------- ---- ---- ----");
249 list_header_done = 1;
252 /* Filter zip entries */
253 if (find_list_entry(zreject, dst_fn) ||
254 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
257 } else { /* Extract entry */
258 total_size += zip_header.formatted.ucmpsize;
260 if (verbosity == v_list) { /* List entry */
261 unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
262 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
263 zip_header.formatted.ucmpsize,
264 (dostime & 0x01e00000) >> 21,
265 (dostime & 0x001f0000) >> 16,
266 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
267 (dostime & 0x0000f800) >> 11,
268 (dostime & 0x000007e0) >> 5,
272 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
274 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
275 if (stat(dst_fn, &stat_buf) == -1) {
276 if (errno != ENOENT) {
277 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
279 if (verbosity == v_normal) {
280 printf(" creating: %s\n", dst_fn);
282 unzip_create_leading_dirs(dst_fn);
283 if (bb_make_directory(dst_fn, 0777, 0)) {
284 bb_error_msg_and_die("exiting");
287 if (!S_ISDIR(stat_buf.st_mode)) {
288 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
293 } else { /* Extract file */
295 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
296 if (errno != ENOENT) {
297 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
300 } else { /* File already exists */
301 if (overwrite == o_never) {
303 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
304 if (overwrite == o_always) {
307 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
308 if (!fgets(key_buf, 512, stdin)) {
309 bb_perror_msg_and_die("cannot read input");
313 } else { /* File is not regular file */
314 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
322 overwrite = o_always;
323 case 'y': /* Open file and fall into unzip */
324 unzip_create_leading_dirs(dst_fn);
325 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
327 if (verbosity == v_normal) {
328 printf(" inflating: %s\n", dst_fn);
330 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
333 if (dst_fd != STDOUT_FILENO) {
334 /* closing STDOUT is potentially bad for future business */
342 /* Skip entry data */
343 unzip_skip(src_fd, zip_header.formatted.cmpsize);
347 /* Prompt for new name */
348 printf("new name: ");
349 if (!fgets(key_buf, 512, stdin)) {
350 bb_perror_msg_and_die("cannot read input");
353 dst_fn = xstrdup(key_buf);
358 printf("error: invalid response [%c]\n",(char)i);
362 /* Data descriptor section */
363 if (zip_header.formatted.flags & 4) {
364 /* skip over duplicate crc, compressed size and uncompressed size */
365 unzip_skip(src_fd, 12);
369 if (verbosity == v_list) {
370 printf(" -------- -------\n"
371 "%9d %d files\n", total_size, total_entries);