/*
* Mini unzip implementation for busybox
*
- * Copyright (C) 2001 by Laurence Anderson
+ * Copyright (C) 2004 by Ed Clark
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Loosely based on original busybox unzip applet by Laurence Anderson.
+ * All options and features should work in this version.
*
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+/* For reference see
+ * http://www.pkware.com/company/standards/appnote/
+ * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
+ */
+
+/* TODO
+ * Endian issues
+ * Zip64 + other methods
+ * Improve handling of zip format, ie.
+ * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
+ * - unix file permissions, etc.
+ * - central directory
*/
#include <fcntl.h>
-#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <errno.h>
#include "unarchive.h"
#include "busybox.h"
-extern int unzip_main(int argc, char **argv)
+#if BB_BIG_ENDIAN
+static inline unsigned short
+__swap16(unsigned short x) {
+ return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
+}
+
+static inline uint32_t
+__swap32(uint32_t x) {
+ return (((x & 0xFF) << 24) |
+ ((x & 0xFF00) << 8) |
+ ((x & 0xFF0000) >> 8) |
+ ((x & 0xFF000000) >> 24));
+}
+#else /* it's little-endian */
+# define __swap16(x) (x)
+# define __swap32(x) (x)
+#endif /* BB_BIG_ENDIAN */
+
+#define ZIP_FILEHEADER_MAGIC __swap32(0x04034b50)
+#define ZIP_CDS_MAGIC __swap32(0x02014b50)
+#define ZIP_CDS_END_MAGIC __swap32(0x06054b50)
+#define ZIP_DD_MAGIC __swap32(0x08074b50)
+
+extern unsigned int gunzip_crc;
+extern unsigned int gunzip_bytes_out;
+
+typedef union {
+ unsigned char raw[26];
+ struct {
+ unsigned short version; /* 0-1 */
+ unsigned short flags; /* 2-3 */
+ unsigned short method; /* 4-5 */
+ unsigned short modtime; /* 6-7 */
+ unsigned short moddate; /* 8-9 */
+ unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
+ unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
+ unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
+ unsigned short filename_len; /* 22-23 */
+ unsigned short extra_len; /* 24-25 */
+ } formated ATTRIBUTE_PACKED;
+} zip_header_t;
+
+static void unzip_skip(int fd, off_t skip)
{
- FILE *src_stream;
- int extract_function = extract_all_to_fs | extract_create_leading_dirs;
- char **extract_names = NULL;
- char **exclude_names = NULL;
- int opt = 0;
- int num_of_entries = 0;
- int exclude = 0;
- char *outdir = "./";
- FILE *msgout = stdout;
-
- while ((opt = getopt(argc, argv, "lnopqxd:")) != -1) {
- switch (opt) {
- case 'l':
- extract_function |= extract_verbose_list;
- extract_function ^= extract_all_to_fs;
- break;
- case 'n':
+ if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
+ if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
+ bb_error_msg_and_die("Seek failure");
+ }
+ }
+}
+
+static void unzip_read(int fd, void *buf, size_t count)
+{
+ if (bb_xread(fd, buf, count) != count) {
+ bb_error_msg_and_die(bb_msg_read_error);
+ }
+}
+
+static void unzip_create_leading_dirs(char *fn)
+{
+ /* Create all leading directories */
+ char *name = bb_xstrdup(fn);
+ if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
+ bb_error_msg_and_die("Exiting"); /* bb_make_directory is noisy */
+ }
+ free(name);
+}
+
+static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
+{
+ if (zip_header->formated.method == 0) {
+ /* Method 0 - stored (not compressed) */
+ int size = zip_header->formated.ucmpsize;
+ if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
+ bb_error_msg_and_die("Cannot complete extraction");
+ }
+
+ } else {
+ /* Method 8 - inflate */
+ inflate_init(zip_header->formated.cmpsize);
+ inflate_unzip(src_fd, dst_fd);
+ inflate_cleanup();
+ /* Validate decompression - crc */
+ if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
+ bb_error_msg("Invalid compressed data--crc error");
+ return 1;
+ }
+ /* Validate decompression - size */
+ if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
+ bb_error_msg("Invalid compressed data--length error");
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int unzip_main(int argc, char **argv)
+{
+ zip_header_t zip_header;
+ enum {v_silent, v_normal, v_list} verbosity = v_normal;
+ enum {o_prompt, o_never, o_always} overwrite = o_prompt;
+ unsigned int total_size = 0;
+ unsigned int total_entries = 0;
+ int src_fd = -1, dst_fd = -1;
+ char *src_fn = NULL, *dst_fn = NULL;
+ llist_t *zaccept = NULL;
+ llist_t *zreject = NULL;
+ char *base_dir = NULL;
+ int failed, i, opt, opt_range = 0, list_header_done = 0;
+ char key_buf[512];
+ struct stat stat_buf;
+
+ while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
+ switch(opt_range) {
+ case 0: /* Options */
+ switch(opt) {
+ case 'l': /* List */
+ verbosity = v_list;
break;
- case 'o':
- extract_function |= extract_unconditional;
+
+ case 'n': /* Never overwrite existing files */
+ overwrite = o_never;
break;
- case 'p':
- extract_function |= extract_to_stdout;
- extract_function ^= extract_all_to_fs;
- /* FALLTHROUGH */
- case 'q':
- msgout = xfopen("/dev/null", "w");
+
+ case 'o': /* Always overwrite existing files */
+ overwrite = o_always;
break;
- case 'd':
- outdir = xstrdup(optarg);
- strcat(outdir, "/");
+
+ case 'p': /* Extract files to stdout and fall through to set verbosity */
+ dst_fd = STDOUT_FILENO;
+
+ case 'q': /* Be quiet */
+ verbosity = (verbosity == v_normal) ? v_silent : verbosity;
break;
- case 'x':
- exclude = 1;
+
+ case 1 : /* The zip file */
+ src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
+ opt_range++;
break;
+
+ default:
+ bb_show_usage();
+
+ }
+ break;
+
+ case 1: /* Include files */
+ if (opt == 1) {
+ llist_add_to(&zaccept, optarg);
+
+ } else if (opt == 'd') {
+ base_dir = optarg;
+ opt_range += 2;
+
+ } else if (opt == 'x') {
+ opt_range++;
+
+ } else {
+ bb_show_usage();
+ }
+ break;
+
+ case 2 : /* Exclude files */
+ if (opt == 1) {
+ llist_add_to(&zreject, optarg);
+
+ } else if (opt == 'd') { /* Extract to base directory */
+ base_dir = optarg;
+ opt_range++;
+
+ } else {
+ bb_show_usage();
+ }
+ break;
+
+ default:
+ bb_show_usage();
}
}
- if (optind == argc) {
- show_usage();
+ if (src_fn == NULL) {
+ bb_show_usage();
}
- if (*argv[optind] == '-') src_stream = stdin;
- else src_stream = xfopen(argv[optind++], "r");
+ /* Open input file */
+ if (strcmp("-", src_fn) == 0) {
+ src_fd = STDIN_FILENO;
+ /* Cannot use prompt mode since zip data is arriving on STDIN */
+ overwrite = (overwrite == o_prompt) ? o_never : overwrite;
+
+ } else {
+ static const char *const extn[] = {"", ".zip", ".ZIP"};
+ int orig_src_fn_len = strlen(src_fn);
+ for(i = 0; (i < 3) && (src_fd == -1); i++) {
+ strcpy(src_fn + orig_src_fn_len, extn[i]);
+ src_fd = open(src_fn, O_RDONLY);
+ }
+ if (src_fd == -1) {
+ src_fn[orig_src_fn_len] = 0;
+ bb_error_msg_and_die("Cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
+ }
+ }
+
+ /* Change dir if necessary */
+ if (base_dir)
+ bb_xchdir(base_dir);
+
+ if (verbosity != v_silent)
+ printf("Archive: %s\n", src_fn);
+
+ failed = 0;
+
+ while (1) {
+ unsigned int magic;
+
+ /* Check magic number */
+ unzip_read(src_fd, &magic, 4);
+ if (magic == ZIP_CDS_MAGIC) {
+ break;
+ } else if (magic != ZIP_FILEHEADER_MAGIC) {
+ bb_error_msg_and_die("Invalid zip magic %08X", magic);
+ }
+
+ /* Read the file header */
+ unzip_read(src_fd, zip_header.raw, 26);
+#if BB_BIG_ENDIAN
+ zip_header.formated.version = __swap16(zip_header.formated.version);
+ zip_header.formated.flags = __swap16(zip_header.formated.flags);
+ zip_header.formated.method = __swap16(zip_header.formated.method);
+ zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
+ zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
+ zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
+ zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
+ zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
+ zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
+ zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
+#endif /* BB_BIG_ENDIAN */
+ if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
+ bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
+ }
+
+ /* Read filename */
+ free(dst_fn);
+ dst_fn = xzalloc(zip_header.formated.filename_len + 1);
+ unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
+
+ /* Skip extra header bytes */
+ unzip_skip(src_fd, zip_header.formated.extra_len);
- while (optind < argc) {
- if (exclude) {
- exclude_names = xrealloc(exclude_names, sizeof(char *) * (num_of_entries + 2));
- exclude_names[num_of_entries] = xstrdup(argv[optind]);
- } else {
- extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
- extract_names[num_of_entries] = xstrdup(argv[optind]);
+ if ((verbosity == v_list) && !list_header_done){
+ printf(" Length Date Time Name\n"
+ " -------- ---- ---- ----\n");
+ list_header_done = 1;
}
- num_of_entries++;
- if (exclude) exclude_names[num_of_entries] = NULL;
- else extract_names[num_of_entries] = NULL;
- optind++;
+
+ /* Filter zip entries */
+ if (find_list_entry(zreject, dst_fn) ||
+ (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
+ i = 'n';
+
+ } else { /* Extract entry */
+ total_size += zip_header.formated.ucmpsize;
+
+ if (verbosity == v_list) { /* List entry */
+ unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
+ printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
+ zip_header.formated.ucmpsize,
+ (dostime & 0x01e00000) >> 21,
+ (dostime & 0x001f0000) >> 16,
+ (((dostime & 0xfe000000) >> 25) + 1980) % 100,
+ (dostime & 0x0000f800) >> 11,
+ (dostime & 0x000007e0) >> 5,
+ dst_fn);
+ total_entries++;
+ i = 'n';
+
+ } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
+ i = -1;
+
+ } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
+ if (stat(dst_fn, &stat_buf) == -1) {
+ if (errno != ENOENT) {
+ bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
+ }
+ if (verbosity == v_normal) {
+ printf(" creating: %s\n", dst_fn);
+ }
+ unzip_create_leading_dirs(dst_fn);
+ if (bb_make_directory(dst_fn, 0777, 0)) {
+ bb_error_msg_and_die("Exiting");
+ }
+ } else {
+ if (!S_ISDIR(stat_buf.st_mode)) {
+ bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
+ }
+ }
+ i = 'n';
+
+ } else { /* Extract file */
+ _check_file:
+ if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
+ if (errno != ENOENT) {
+ bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
+ }
+ i = 'y';
+
+ } else { /* File already exists */
+ if (overwrite == o_never) {
+ i = 'n';
+
+ } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
+ if (overwrite == o_always) {
+ i = 'y';
+ } else {
+ printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
+ if (!fgets(key_buf, 512, stdin)) {
+ bb_perror_msg_and_die("Cannot read input");
+ }
+ i = key_buf[0];
+ }
+
+ } else { /* File is not regular file */
+ bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
+ }
+ }
+ }
+ }
+
+ switch (i) {
+ case 'A':
+ overwrite = o_always;
+ case 'y': /* Open file and fall into unzip */
+ unzip_create_leading_dirs(dst_fn);
+ dst_fd = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
+ case -1: /* Unzip */
+ if (verbosity == v_normal) {
+ printf(" inflating: %s\n", dst_fn);
+ }
+ if (unzip_extract(&zip_header, src_fd, dst_fd)) {
+ failed = 1;
+ }
+ if (dst_fd != STDOUT_FILENO) {
+ /* closing STDOUT is potentially bad for future business */
+ close(dst_fd);
+ }
+ break;
+
+ case 'N':
+ overwrite = o_never;
+ case 'n':
+ /* Skip entry data */
+ unzip_skip(src_fd, zip_header.formated.cmpsize);
+ break;
+
+ case 'r':
+ /* Prompt for new name */
+ printf("new name: ");
+ if (!fgets(key_buf, 512, stdin)) {
+ bb_perror_msg_and_die("Cannot read input");
+ }
+ free(dst_fn);
+ dst_fn = bb_xstrdup(key_buf);
+ chomp(dst_fn);
+ goto _check_file;
+
+ default:
+ printf("error: invalid response [%c]\n",(char)i);
+ goto _check_file;
+ }
+
+ /* Data descriptor section */
+ if (zip_header.formated.flags & 4) {
+ /* skip over duplicate crc, compressed size and uncompressed size */
+ unzip_skip(src_fd, 12);
+ }
+ }
+
+ if (verbosity == v_list) {
+ printf(" -------- -------\n"
+ "%9d %d files\n", total_size, total_entries);
}
- unarchive(src_stream, msgout, &get_header_zip, extract_function, outdir, extract_names, exclude_names);
- return EXIT_SUCCESS;
+ return failed;
}
projects / oweals / busybox.git / blobdiff