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/* vi: set sw=4 ts=4: */
/*
* Mini unzip implementation for busybox
*
* Copyright (C) 2001 by Laurence Anderson
*
* 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
*
*/
/* For reference to format see http://www.pkware.com/support/appnote.html */
/* TODO Endian issues, exclude, should we accept input from stdin ? */
#include <fcntl.h>
#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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)
{
printf(" inflating: %s\n", file_header->name);
}
static void header_verbose_list_unzip(const file_header_t *file_header)
{
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;
}
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);
}
extern 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;
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;
break;
case 'n': /* never overwright existing files */
break;
case 'o':
archive_handle->flags = ARCHIVE_EXTRACT_UNCONDITIONAL;
break;
case 'p': /* extract files to stdout */
archive_handle->action_data = data_extract_to_stdout;
break;
case 'q': /* Extract files quietly */
archive_handle->action_header = header_skip;
break;
case 'd': /* Extract files to specified base directory*/
base_dir = optarg;
break;
#if 0
case 'x': /* Exclude the specified files */
archive_handle->filter = filter_accept_reject_list;
break;
#endif
default:
show_usage();
}
}
if (argc == optind) {
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 = fileno(stdin);
} else {
archive_handle->src_fd = xopen(argv[optind++], O_RDONLY);
}
if ((base_dir) && (chdir(base_dir))) {
perror_msg_and_die("Couldnt chdir");
}
while (optind < argc) {
archive_handle->filter = filter_accept_list;
archive_handle->accept = add_to_list(archive_handle->accept, argv[optind]);
optind++;
}
while (1) {
unsigned int magic;
int dst_fd;
/* TODO Endian issues */
xread_all(archive_handle->src_fd, &magic, 4);
archive_handle->offset += 4;
if (magic == ZIP_CDS_MAGIC) {
break;
}
else if (magic != ZIP_FILEHEADER_MAGIC) {
error_msg_and_die("Invlaide zip magic");
}
/* Read the file header */
xread_all(archive_handle->src_fd, zip_header.raw, 26);
archive_handle->offset += 26;
archive_handle->file_header->mode = S_IFREG | 0777;
if (zip_header.formated.method != 8) {
error_msg_and_die("Unsupported compression method %d\n", zip_header.formated.method);
}
/* Read filename */
archive_handle->file_header->name = xmalloc(zip_header.formated.filename_len + 1);
xread_all(archive_handle->src_fd, 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;
}
/* 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 = xopen(archive_handle->file_header->name, O_WRONLY | O_CREAT);
inflate(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)) {
error_msg("Invalid compressed data--crc error");
}
/* Validate decompression - size */
if (gunzip_bytes_out != zip_header.formated.ucmpsize) {
error_msg("Invalid compressed data--length error");
}
}
/* 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++;
archive_handle->action_header(archive_handle->file_header);
/* Data descriptor section */
if (zip_header.formated.flags & 4) {
/* skip over duplicate crc, compressed size and uncompressed size */
unsigned short i;
for (i = 0; i != 12; i++) {
xread_char(archive_handle->src_fd);
}
archive_handle->offset += 12;
}
}
/* Central directory section */
if (archive_handle->action_header == header_verbose_list_unzip) {
printf(" -------- -------\n");
printf("%9d %d files\n", total_size, total_entries);
}
return(EXIT_SUCCESS);
}
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