summaryrefslogtreecommitdiff
path: root/archival/unzip.c
blob: c670073f4999c74ba72893f88a265ed456e55492 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/* 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:
				bb_show_usage();
		}
	}

	if (argc == optind) {
		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 = fileno(stdin);
		archive_handle->seek = seek_by_char;
	} else {
		archive_handle->src_fd = bb_xopen(argv[optind++], O_RDONLY);
	}

	if ((base_dir) && (chdir(base_dir))) {
		bb_perror_msg_and_die("Couldnt chdir");
	}

	while (optind < argc) {
		archive_handle->filter = filter_accept_list;
		archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]);
		optind++;
	}

	while (1) {
		unsigned int magic;
		int dst_fd;

		/* TODO Endian issues */
		archive_xread_all(archive_handle, &magic, 4);
		archive_handle->offset += 4;

		if (magic == ZIP_CDS_MAGIC) {
			break;
		}
		else if (magic != ZIP_FILEHEADER_MAGIC) {
			bb_error_msg_and_die("Invlaide zip 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);
		}

		/* 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;
		}

		/* 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");
			}

			/* Validate decompression - size */
			if (gunzip_bytes_out != zip_header.formated.ucmpsize) {
				bb_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 char data_description[12];
			archive_xread_all(archive_handle, data_description, 12);
			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);
}