/*
* 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/products/enterprise/white_papers/appnote.txt
+ * http://www.pkware.com/company/standards/appnote/
* http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
*/
-/* TODO Endian issues, exclude, should we accept input from stdin ? */
+/* 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 "libbb.h"
#include "unarchive.h"
-#include "busybox.h"
-
-#define ZIP_FILEHEADER_MAGIC 0x04034b50
-#define ZIP_CDS_MAGIC 0x02014b50
-#define ZIP_CDS_END_MAGIC 0x06054b50
-#define ZIP_DD_MAGIC 0x08074b50
-extern unsigned int gunzip_crc;
-extern unsigned int gunzip_bytes_out;
-
-static void header_list_unzip(const file_header_t *file_header)
+enum {
+#if BB_BIG_ENDIAN
+ ZIP_FILEHEADER_MAGIC = 0x504b0304,
+ ZIP_CDS_MAGIC = 0x504b0102,
+ ZIP_CDS_END_MAGIC = 0x504b0506,
+ ZIP_DD_MAGIC = 0x504b0708,
+#else
+ ZIP_FILEHEADER_MAGIC = 0x04034b50,
+ ZIP_CDS_MAGIC = 0x02014b50,
+ ZIP_CDS_END_MAGIC = 0x06054b50,
+ ZIP_DD_MAGIC = 0x08074b50,
+#endif
+};
+
+#define ZIP_HEADER_LEN 26
+
+typedef union {
+ uint8_t raw[ZIP_HEADER_LEN];
+ struct {
+ uint16_t version; /* 0-1 */
+ uint16_t flags; /* 2-3 */
+ uint16_t method; /* 4-5 */
+ uint16_t modtime; /* 6-7 */
+ uint16_t moddate; /* 8-9 */
+ uint32_t crc32 ATTRIBUTE_PACKED; /* 10-13 */
+ uint32_t cmpsize ATTRIBUTE_PACKED; /* 14-17 */
+ uint32_t ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
+ uint16_t filename_len; /* 22-23 */
+ uint16_t extra_len; /* 24-25 */
+ } formatted ATTRIBUTE_PACKED;
+} zip_header_t; /* ATTRIBUTE_PACKED - gcc 4.2.1 doesn't like it (spews warning) */
+
+/* Check the offset of the last element, not the length. This leniency
+ * allows for poor packing, whereby the overall struct may be too long,
+ * even though the elements are all in the right place.
+ */
+struct BUG_zip_header_must_be_26_bytes {
+ char BUG_zip_header_must_be_26_bytes[
+ offsetof(zip_header_t, formatted.extra_len) + 2 ==
+ ZIP_HEADER_LEN ? 1 : -1];
+};
+
+#define FIX_ENDIANNESS(zip_header) do { \
+ (zip_header).formatted.version = SWAP_LE16((zip_header).formatted.version ); \
+ (zip_header).formatted.flags = SWAP_LE16((zip_header).formatted.flags ); \
+ (zip_header).formatted.method = SWAP_LE16((zip_header).formatted.method ); \
+ (zip_header).formatted.modtime = SWAP_LE16((zip_header).formatted.modtime ); \
+ (zip_header).formatted.moddate = SWAP_LE16((zip_header).formatted.moddate ); \
+ (zip_header).formatted.crc32 = SWAP_LE32((zip_header).formatted.crc32 ); \
+ (zip_header).formatted.cmpsize = SWAP_LE32((zip_header).formatted.cmpsize ); \
+ (zip_header).formatted.ucmpsize = SWAP_LE32((zip_header).formatted.ucmpsize ); \
+ (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
+ (zip_header).formatted.extra_len = SWAP_LE16((zip_header).formatted.extra_len ); \
+} while (0)
+
+static void unzip_skip(int fd, off_t skip)
{
- printf(" inflating: %s\n", file_header->name);
+ bb_copyfd_exact_size(fd, -1, skip);
}
-static void header_verbose_list_unzip(const file_header_t *file_header)
+static void unzip_create_leading_dirs(const char *fn)
{
- unsigned int dostime = (unsigned int) file_header->mtime;
-
- /* can printf arguments cut of the decade component ? */
- unsigned short year = 1980 + ((dostime & 0xfe000000) >> 25);
- while (year >= 100) {
- year -= 100;
+ /* Create all leading directories */
+ char *name = xstrdup(fn);
+ if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
+ bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
}
+ free(name);
+}
- printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
- (unsigned int) file_header->size,
- (dostime & 0x01e00000) >> 21,
- (dostime & 0x001f0000) >> 16,
- year,
- (dostime & 0x0000f800) >> 11,
- (dostime & 0x000007e0) >> 5,
- file_header->name);
+static void unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
+{
+ if (zip_header->formatted.method == 0) {
+ /* Method 0 - stored (not compressed) */
+ off_t size = zip_header->formatted.ucmpsize;
+ if (size)
+ bb_copyfd_exact_size(src_fd, dst_fd, size);
+ } else {
+ /* Method 8 - inflate */
+ inflate_unzip_result res;
+ if (inflate_unzip(&res, zip_header->formatted.cmpsize, src_fd, dst_fd) < 0)
+ bb_error_msg_and_die("inflate error");
+ /* Validate decompression - crc */
+ if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
+ bb_error_msg_and_die("crc error");
+ }
+ /* Validate decompression - size */
+ if (zip_header->formatted.ucmpsize != res.bytes_out) {
+ /* Don't die. Who knows, maybe len calculation
+ * was botched somewhere. After all, crc matched! */
+ bb_error_msg("bad length");
+ }
+ }
}
-extern int unzip_main(int argc, char **argv)
+int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int unzip_main(int argc, char **argv)
{
- 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;
-
- archive_handle_t *archive_handle;
- unsigned int total_size = 0;
- unsigned int total_entries = 0;
+ enum { O_PROMPT, O_NEVER, O_ALWAYS };
+
+ zip_header_t zip_header;
+ smallint verbose = 1;
+ smallint listing = 0;
+ smallint overwrite = O_PROMPT;
+ unsigned total_size;
+ unsigned total_entries;
+ int src_fd = -1;
+ int dst_fd = -1;
+ char *src_fn = NULL;
+ char *dst_fn = NULL;
+ llist_t *zaccept = NULL;
+ llist_t *zreject = NULL;
char *base_dir = NULL;
- int opt = 0;
-
- /* Initialise */
- archive_handle = init_handle();
- archive_handle->action_data = NULL;
- archive_handle->action_header = header_list_unzip;
-
- while ((opt = getopt(argc, argv, "lnopqd:")) != -1) {
- switch (opt) {
- case 'l': /* list */
- archive_handle->action_header = header_verbose_list_unzip;
- archive_handle->action_data = data_skip;
+ int i, opt;
+ int opt_range = 0;
+ char key_buf[80];
+ struct stat stat_buf;
+
+ /* '-' makes getopt return 1 for non-options */
+ while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
+ switch (opt_range) {
+ case 0: /* Options */
+ switch (opt) {
+ case 'l': /* List */
+ listing = 1;
break;
- case 'n': /* never overwright existing files */
+
+ case 'n': /* Never overwrite existing files */
+ overwrite = O_NEVER;
break;
- case 'o':
- archive_handle->flags = ARCHIVE_EXTRACT_UNCONDITIONAL;
+
+ case 'o': /* Always overwrite existing files */
+ overwrite = O_ALWAYS;
break;
- case 'p': /* extract files to stdout */
- archive_handle->action_data = data_extract_to_stdout;
+
+ case 'p': /* Extract files to stdout and fall through to set verbosity */
+ dst_fd = STDOUT_FILENO;
+
+ case 'q': /* Be quiet */
+ verbose = 0;
break;
- case 'q': /* Extract files quietly */
- archive_handle->action_header = header_skip;
+
+ case 1: /* The zip file */
+ /* +5: space for ".zip" and NUL */
+ src_fn = xmalloc(strlen(optarg) + 5);
+ strcpy(src_fn, optarg);
+ opt_range++;
+ break;
+
+ default:
+ bb_show_usage();
+
+ }
+ break;
+
+ case 1: /* Include files */
+ if (opt == 1) {
+ llist_add_to(&zaccept, optarg);
break;
- case 'd': /* Extract files to specified base directory*/
+ }
+ if (opt == 'd') {
base_dir = optarg;
+ opt_range += 2;
+ break;
+ }
+ if (opt == 'x') {
+ opt_range++;
break;
-#if 0
- case 'x': /* Exclude the specified files */
- archive_handle->filter = filter_accept_reject_list;
+ }
+ bb_show_usage();
+
+ case 2 : /* Exclude files */
+ if (opt == 1) {
+ llist_add_to(&zreject, optarg);
break;
-#endif
- default:
- bb_show_usage();
+ }
+ if (opt == 'd') { /* Extract to base directory */
+ base_dir = optarg;
+ opt_range++;
+ break;
+ }
+ /* fall through */
+
+ default:
+ bb_show_usage();
}
}
- if (argc == optind) {
+ if (src_fn == NULL) {
bb_show_usage();
}
- printf("Archive: %s\n", argv[optind]);
- if (archive_handle->action_header == header_verbose_list_unzip) {
- printf(" Length Date Time Name\n");
- printf(" -------- ---- ---- ----\n");
- }
-
- if (*argv[optind] == '-') {
- archive_handle->src_fd = STDIN_FILENO;
- archive_handle->seek = seek_by_char;
+ /* Open input file */
+ if (LONE_DASH(src_fn)) {
+ src_fd = STDIN_FILENO;
+ /* Cannot use prompt mode since zip data is arriving on STDIN */
+ if (overwrite == O_PROMPT)
+ overwrite = O_NEVER;
} else {
- archive_handle->src_fd = bb_xopen(argv[optind++], O_RDONLY);
- }
+ static const char extn[][5] = {"", ".zip", ".ZIP"};
+ int orig_src_fn_len = strlen(src_fn);
- if ((base_dir) && (chdir(base_dir))) {
- bb_perror_msg_and_die("Couldnt chdir");
+ 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("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
+ }
}
- while (optind < argc) {
- archive_handle->filter = filter_accept_list;
- archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]);
- optind++;
+ /* Change dir if necessary */
+ if (base_dir)
+ xchdir(base_dir);
+
+ if (verbose) {
+ printf("Archive: %s\n", src_fn);
+ if (listing){
+ puts(" Length Date Time Name\n"
+ " -------- ---- ---- ----");
+ }
}
+ total_size = 0;
+ total_entries = 0;
while (1) {
- unsigned int magic;
- int dst_fd;
-
- /* TODO Endian issues */
- archive_xread_all(archive_handle, &magic, 4);
- archive_handle->offset += 4;
+ uint32_t magic;
- if (magic == ZIP_CDS_MAGIC) {
+ /* Check magic number */
+ xread(src_fd, &magic, 4);
+ if (magic == ZIP_CDS_MAGIC)
break;
- }
- else if (magic != ZIP_FILEHEADER_MAGIC) {
- bb_error_msg_and_die("Invlaide zip magic");
- }
+ if (magic != ZIP_FILEHEADER_MAGIC)
+ bb_error_msg_and_die("invalid zip magic %08X", magic);
/* Read the file header */
- archive_xread_all(archive_handle, zip_header.raw, 26);
- archive_handle->offset += 26;
- archive_handle->file_header->mode = S_IFREG | 0777;
-
- if (zip_header.formated.method != 8) {
- bb_error_msg_and_die("Unsupported compression method %d\n", zip_header.formated.method);
+ xread(src_fd, zip_header.raw, ZIP_HEADER_LEN);
+ FIX_ENDIANNESS(zip_header);
+ if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
+ bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
}
/* Read filename */
- archive_handle->file_header->name = xmalloc(zip_header.formated.filename_len + 1);
- archive_xread_all(archive_handle, archive_handle->file_header->name, zip_header.formated.filename_len);
- archive_handle->offset += zip_header.formated.filename_len;
- archive_handle->file_header->name[zip_header.formated.filename_len] = '\0';
-
- /* Skip extra header bits */
- archive_handle->file_header->size = zip_header.formated.extra_len;
- data_skip(archive_handle);
- archive_handle->offset += zip_header.formated.extra_len;
-
- /* Handle directories */
- archive_handle->file_header->mode = S_IFREG | 0777;
- if (last_char_is(archive_handle->file_header->name, '/')) {
- archive_handle->file_header->mode ^= S_IFREG;
- archive_handle->file_header->mode |= S_IFDIR;
+ free(dst_fn);
+ dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
+ xread(src_fd, dst_fn, zip_header.formatted.filename_len);
+
+ /* Skip extra header bytes */
+ unzip_skip(src_fd, zip_header.formatted.extra_len);
+
+ /* Filter zip entries */
+ if (find_list_entry(zreject, dst_fn)
+ || (zaccept && !find_list_entry(zaccept, dst_fn))
+ ) { /* Skip entry */
+ i = 'n';
+
+ } else { /* Extract entry */
+ if (listing) { /* List entry */
+ if (verbose) {
+ unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
+ printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
+ zip_header.formatted.ucmpsize,
+ (dostime & 0x01e00000) >> 21,
+ (dostime & 0x001f0000) >> 16,
+ (((dostime & 0xfe000000) >> 25) + 1980) % 100,
+ (dostime & 0x0000f800) >> 11,
+ (dostime & 0x000007e0) >> 5,
+ dst_fn);
+ total_size += zip_header.formatted.ucmpsize;
+ total_entries++;
+ } else {
+ /* short listing -- filenames only */
+ puts(dst_fn);
+ }
+ 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 (verbose) {
+ 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, sizeof(key_buf), 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);
+ }
+ }
+ }
}
- /* Data section */
- archive_handle->file_header->size = zip_header.formated.cmpsize;
- if (archive_handle->action_data) {
- archive_handle->action_data(archive_handle);
- } else {
- dst_fd = bb_xopen(archive_handle->file_header->name, O_WRONLY | O_CREAT);
- inflate_init(zip_header.formated.cmpsize);
- inflate_unzip(archive_handle->src_fd, dst_fd);
- close(dst_fd);
- chmod(archive_handle->file_header->name, archive_handle->file_header->mode);
-
- /* Validate decompression - crc */
- if (zip_header.formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
- bb_error_msg("Invalid compressed data--crc error");
+ switch (i) {
+ case 'A':
+ overwrite = O_ALWAYS;
+ case 'y': /* Open file and fall into unzip */
+ unzip_create_leading_dirs(dst_fn);
+ dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
+ case -1: /* Unzip */
+ if (verbose) {
+ printf(" inflating: %s\n", dst_fn);
}
-
- /* Validate decompression - size */
- if (gunzip_bytes_out != zip_header.formated.ucmpsize) {
- bb_error_msg("Invalid compressed data--length error");
+ unzip_extract(&zip_header, src_fd, dst_fd);
+ if (dst_fd != STDOUT_FILENO) {
+ /* closing STDOUT is potentially bad for future business */
+ close(dst_fd);
}
- }
+ break;
- /* local file descriptor section */
- archive_handle->offset += zip_header.formated.cmpsize;
- /* This ISNT unix time */
- archive_handle->file_header->mtime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
- archive_handle->file_header->size = zip_header.formated.ucmpsize;
- total_size += archive_handle->file_header->size;
- total_entries++;
+ case 'N':
+ overwrite = O_NEVER;
+ case 'n':
+ /* Skip entry data */
+ unzip_skip(src_fd, zip_header.formatted.cmpsize);
+ break;
- archive_handle->action_header(archive_handle->file_header);
+ case 'r':
+ /* Prompt for new name */
+ printf("new name: ");
+ if (!fgets(key_buf, sizeof(key_buf), stdin)) {
+ bb_perror_msg_and_die("cannot read input");
+ }
+ free(dst_fn);
+ dst_fn = 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) {
+ if (zip_header.formatted.flags & 4) {
/* skip over duplicate crc, compressed size and uncompressed size */
- unsigned char data_description[12];
- archive_xread_all(archive_handle, data_description, 12);
- archive_handle->offset += 12;
+ unzip_skip(src_fd, 12);
}
}
- /* Central directory section */
- if (archive_handle->action_header == header_verbose_list_unzip) {
- printf(" -------- -------\n");
- printf("%9d %d files\n", total_size, total_entries);
+ if (listing && verbose) {
+ printf(" -------- -------\n"
+ "%9d %d files\n",
+ total_size, total_entries);
}
- return(EXIT_SUCCESS);
+ return 0;
}
projects / oweals / busybox.git / blobdiff