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) {
57 if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
58 bb_error_msg_and_die("seek failure");
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;
78 if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
79 bb_error_msg_and_die("cannot complete extraction");
83 /* Method 8 - inflate */
84 inflate_init(zip_header->formatted.cmpsize);
85 inflate_unzip(src_fd, dst_fd);
87 /* Validate decompression - crc */
88 if (zip_header->formatted.crc32 != (gunzip_crc ^ 0xffffffffL)) {
89 bb_error_msg("invalid compressed data--%s error", "crc");
92 /* Validate decompression - size */
93 if (zip_header->formatted.ucmpsize != gunzip_bytes_out) {
94 bb_error_msg("invalid compressed data--%s error", "length");
101 int unzip_main(int argc, char **argv)
103 zip_header_t zip_header;
104 enum {v_silent, v_normal, v_list} verbosity = v_normal;
105 enum {o_prompt, o_never, o_always} overwrite = o_prompt;
106 unsigned int total_size = 0;
107 unsigned int total_entries = 0;
108 int src_fd = -1, dst_fd = -1;
109 char *src_fn = NULL, *dst_fn = NULL;
110 llist_t *zaccept = NULL;
111 llist_t *zreject = NULL;
112 char *base_dir = NULL;
113 int failed, i, opt, opt_range = 0, list_header_done = 0;
115 struct stat stat_buf;
117 while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
119 case 0: /* Options */
125 case 'n': /* Never overwrite existing files */
129 case 'o': /* Always overwrite existing files */
130 overwrite = o_always;
133 case 'p': /* Extract files to stdout and fall through to set verbosity */
134 dst_fd = STDOUT_FILENO;
136 case 'q': /* Be quiet */
137 verbosity = (verbosity == v_normal) ? v_silent : verbosity;
140 case 1 : /* The zip file */
141 src_fn = xstrndup(optarg, strlen(optarg)+4);
151 case 1: /* Include files */
153 llist_add_to(&zaccept, optarg);
155 } else if (opt == 'd') {
159 } else if (opt == 'x') {
167 case 2 : /* Exclude files */
169 llist_add_to(&zreject, optarg);
171 } else if (opt == 'd') { /* Extract to base directory */
185 if (src_fn == NULL) {
189 /* Open input file */
190 if (strcmp("-", src_fn) == 0) {
191 src_fd = STDIN_FILENO;
192 /* Cannot use prompt mode since zip data is arriving on STDIN */
193 overwrite = (overwrite == o_prompt) ? o_never : overwrite;
196 static const char *const extn[] = {"", ".zip", ".ZIP"};
197 int orig_src_fn_len = strlen(src_fn);
198 for(i = 0; (i < 3) && (src_fd == -1); i++) {
199 strcpy(src_fn + orig_src_fn_len, extn[i]);
200 src_fd = open(src_fn, O_RDONLY);
203 src_fn[orig_src_fn_len] = 0;
204 bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
208 /* Change dir if necessary */
212 if (verbosity != v_silent)
213 printf("Archive: %s\n", src_fn);
220 /* Check magic number */
221 xread(src_fd, &magic, 4);
222 if (magic == ZIP_CDS_MAGIC) {
224 } else if (magic != ZIP_FILEHEADER_MAGIC) {
225 bb_error_msg_and_die("invalid zip magic %08X", magic);
228 /* Read the file header */
229 xread(src_fd, zip_header.raw, 26);
230 zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
231 zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
232 zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
233 zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
234 zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
235 zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
236 zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
237 zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
238 zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
239 zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
240 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
241 bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
246 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
247 xread(src_fd, dst_fn, zip_header.formatted.filename_len);
249 /* Skip extra header bytes */
250 unzip_skip(src_fd, zip_header.formatted.extra_len);
252 if ((verbosity == v_list) && !list_header_done){
253 printf(" Length Date Time Name\n"
254 " -------- ---- ---- ----\n");
255 list_header_done = 1;
258 /* Filter zip entries */
259 if (find_list_entry(zreject, dst_fn) ||
260 (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
263 } else { /* Extract entry */
264 total_size += zip_header.formatted.ucmpsize;
266 if (verbosity == v_list) { /* List entry */
267 unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
268 printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
269 zip_header.formatted.ucmpsize,
270 (dostime & 0x01e00000) >> 21,
271 (dostime & 0x001f0000) >> 16,
272 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
273 (dostime & 0x0000f800) >> 11,
274 (dostime & 0x000007e0) >> 5,
279 } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
282 } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
283 if (stat(dst_fn, &stat_buf) == -1) {
284 if (errno != ENOENT) {
285 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
287 if (verbosity == v_normal) {
288 printf(" creating: %s\n", dst_fn);
290 unzip_create_leading_dirs(dst_fn);
291 if (bb_make_directory(dst_fn, 0777, 0)) {
292 bb_error_msg_and_die("exiting");
295 if (!S_ISDIR(stat_buf.st_mode)) {
296 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
301 } else { /* Extract file */
303 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
304 if (errno != ENOENT) {
305 bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
309 } else { /* File already exists */
310 if (overwrite == o_never) {
313 } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
314 if (overwrite == o_always) {
317 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
318 if (!fgets(key_buf, 512, stdin)) {
319 bb_perror_msg_and_die("cannot read input");
324 } else { /* File is not regular file */
325 bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
333 overwrite = o_always;
334 case 'y': /* Open file and fall into unzip */
335 unzip_create_leading_dirs(dst_fn);
336 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
338 if (verbosity == v_normal) {
339 printf(" inflating: %s\n", dst_fn);
341 if (unzip_extract(&zip_header, src_fd, dst_fd)) {
344 if (dst_fd != STDOUT_FILENO) {
345 /* closing STDOUT is potentially bad for future business */
353 /* Skip entry data */
354 unzip_skip(src_fd, zip_header.formatted.cmpsize);
358 /* Prompt for new name */
359 printf("new name: ");
360 if (!fgets(key_buf, 512, stdin)) {
361 bb_perror_msg_and_die("cannot read input");
364 dst_fn = xstrdup(key_buf);
369 printf("error: invalid response [%c]\n",(char)i);
373 /* Data descriptor section */
374 if (zip_header.formatted.flags & 4) {
375 /* skip over duplicate crc, compressed size and uncompressed size */
376 unzip_skip(src_fd, 12);
380 if (verbosity == v_list) {
381 printf(" -------- -------\n"
382 "%9d %d files\n", total_size, total_entries);