File: archive-zip.c

package info (click to toggle)
git 1:2.20.1-2+deb10u3
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 45,676 kB
  • sloc: ansic: 210,769; sh: 180,432; perl: 29,102; tcl: 21,663; python: 6,143; makefile: 3,700; sed: 189; php: 120; asm: 98; csh: 45; ruby: 24; lisp: 12
file content (654 lines) | stat: -rw-r--r-- 17,568 bytes parent folder | download | duplicates (2)
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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
/*
 * Copyright (c) 2006 Rene Scharfe
 */
#include "cache.h"
#include "config.h"
#include "archive.h"
#include "streaming.h"
#include "utf8.h"
#include "object-store.h"
#include "userdiff.h"
#include "xdiff-interface.h"

static int zip_date;
static int zip_time;

/* We only care about the "buf" part here. */
static struct strbuf zip_dir;

static uintmax_t zip_offset;
static uint64_t zip_dir_entries;

static unsigned int max_creator_version;

#define ZIP_STREAM	(1 <<  3)
#define ZIP_UTF8	(1 << 11)

struct zip_local_header {
	unsigned char magic[4];
	unsigned char version[2];
	unsigned char flags[2];
	unsigned char compression_method[2];
	unsigned char mtime[2];
	unsigned char mdate[2];
	unsigned char crc32[4];
	unsigned char compressed_size[4];
	unsigned char size[4];
	unsigned char filename_length[2];
	unsigned char extra_length[2];
	unsigned char _end[1];
};

struct zip_data_desc {
	unsigned char magic[4];
	unsigned char crc32[4];
	unsigned char compressed_size[4];
	unsigned char size[4];
	unsigned char _end[1];
};

struct zip64_data_desc {
	unsigned char magic[4];
	unsigned char crc32[4];
	unsigned char compressed_size[8];
	unsigned char size[8];
	unsigned char _end[1];
};

struct zip_dir_trailer {
	unsigned char magic[4];
	unsigned char disk[2];
	unsigned char directory_start_disk[2];
	unsigned char entries_on_this_disk[2];
	unsigned char entries[2];
	unsigned char size[4];
	unsigned char offset[4];
	unsigned char comment_length[2];
	unsigned char _end[1];
};

struct zip_extra_mtime {
	unsigned char magic[2];
	unsigned char extra_size[2];
	unsigned char flags[1];
	unsigned char mtime[4];
	unsigned char _end[1];
};

struct zip64_extra {
	unsigned char magic[2];
	unsigned char extra_size[2];
	unsigned char size[8];
	unsigned char compressed_size[8];
	unsigned char _end[1];
};

struct zip64_dir_trailer {
	unsigned char magic[4];
	unsigned char record_size[8];
	unsigned char creator_version[2];
	unsigned char version[2];
	unsigned char disk[4];
	unsigned char directory_start_disk[4];
	unsigned char entries_on_this_disk[8];
	unsigned char entries[8];
	unsigned char size[8];
	unsigned char offset[8];
	unsigned char _end[1];
};

struct zip64_dir_trailer_locator {
	unsigned char magic[4];
	unsigned char disk[4];
	unsigned char offset[8];
	unsigned char number_of_disks[4];
	unsigned char _end[1];
};

/*
 * On ARM, padding is added at the end of the struct, so a simple
 * sizeof(struct ...) reports two bytes more than the payload size
 * we're interested in.
 */
#define ZIP_LOCAL_HEADER_SIZE	offsetof(struct zip_local_header, _end)
#define ZIP_DATA_DESC_SIZE	offsetof(struct zip_data_desc, _end)
#define ZIP64_DATA_DESC_SIZE	offsetof(struct zip64_data_desc, _end)
#define ZIP_DIR_HEADER_SIZE	offsetof(struct zip_dir_header, _end)
#define ZIP_DIR_TRAILER_SIZE	offsetof(struct zip_dir_trailer, _end)
#define ZIP_EXTRA_MTIME_SIZE	offsetof(struct zip_extra_mtime, _end)
#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
#define ZIP64_EXTRA_SIZE	offsetof(struct zip64_extra, _end)
#define ZIP64_EXTRA_PAYLOAD_SIZE \
	(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
#define ZIP64_DIR_TRAILER_SIZE	offsetof(struct zip64_dir_trailer, _end)
#define ZIP64_DIR_TRAILER_RECORD_SIZE \
	(ZIP64_DIR_TRAILER_SIZE - \
	 offsetof(struct zip64_dir_trailer, creator_version))
#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
	offsetof(struct zip64_dir_trailer_locator, _end)

static void copy_le16(unsigned char *dest, unsigned int n)
{
	dest[0] = 0xff & n;
	dest[1] = 0xff & (n >> 010);
}

static void copy_le32(unsigned char *dest, unsigned int n)
{
	dest[0] = 0xff & n;
	dest[1] = 0xff & (n >> 010);
	dest[2] = 0xff & (n >> 020);
	dest[3] = 0xff & (n >> 030);
}

static void copy_le64(unsigned char *dest, uint64_t n)
{
	dest[0] = 0xff & n;
	dest[1] = 0xff & (n >> 010);
	dest[2] = 0xff & (n >> 020);
	dest[3] = 0xff & (n >> 030);
	dest[4] = 0xff & (n >> 040);
	dest[5] = 0xff & (n >> 050);
	dest[6] = 0xff & (n >> 060);
	dest[7] = 0xff & (n >> 070);
}

static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
{
	if (n <= max)
		return n;
	*clamped = 1;
	return max;
}

static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
{
	copy_le16(dest, clamp_max(n, 0xffff, clamped));
}

static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
{
	copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
}

static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
{
	while (size-- > 0) {
		strbuf_addch(sb, n & 0xff);
		n >>= 8;
	}
	return -!!n;
}

static uint32_t clamp32(uintmax_t n)
{
	const uintmax_t max = 0xffffffff;
	return (n < max) ? n : max;
}

static void *zlib_deflate_raw(void *data, unsigned long size,
			      int compression_level,
			      unsigned long *compressed_size)
{
	git_zstream stream;
	unsigned long maxsize;
	void *buffer;
	int result;

	git_deflate_init_raw(&stream, compression_level);
	maxsize = git_deflate_bound(&stream, size);
	buffer = xmalloc(maxsize);

	stream.next_in = data;
	stream.avail_in = size;
	stream.next_out = buffer;
	stream.avail_out = maxsize;

	do {
		result = git_deflate(&stream, Z_FINISH);
	} while (result == Z_OK);

	if (result != Z_STREAM_END) {
		free(buffer);
		return NULL;
	}

	git_deflate_end(&stream);
	*compressed_size = stream.total_out;

	return buffer;
}

static void write_zip_data_desc(unsigned long size,
				unsigned long compressed_size,
				unsigned long crc)
{
	if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
		struct zip64_data_desc trailer;
		copy_le32(trailer.magic, 0x08074b50);
		copy_le32(trailer.crc32, crc);
		copy_le64(trailer.compressed_size, compressed_size);
		copy_le64(trailer.size, size);
		write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
		zip_offset += ZIP64_DATA_DESC_SIZE;
	} else {
		struct zip_data_desc trailer;
		copy_le32(trailer.magic, 0x08074b50);
		copy_le32(trailer.crc32, crc);
		copy_le32(trailer.compressed_size, compressed_size);
		copy_le32(trailer.size, size);
		write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
		zip_offset += ZIP_DATA_DESC_SIZE;
	}
}

static void set_zip_header_data_desc(struct zip_local_header *header,
				     unsigned long size,
				     unsigned long compressed_size,
				     unsigned long crc)
{
	copy_le32(header->crc32, crc);
	copy_le32(header->compressed_size, compressed_size);
	copy_le32(header->size, size);
}

static int has_only_ascii(const char *s)
{
	for (;;) {
		int c = *s++;
		if (c == '\0')
			return 1;
		if (!isascii(c))
			return 0;
	}
}

static int entry_is_binary(struct index_state *istate, const char *path,
			   const void *buffer, size_t size)
{
	struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
	if (!driver)
		driver = userdiff_find_by_name("default");
	if (driver->binary != -1)
		return driver->binary;
	return buffer_is_binary(buffer, size);
}

#define STREAM_BUFFER_SIZE (1024 * 16)

static int write_zip_entry(struct archiver_args *args,
			   const struct object_id *oid,
			   const char *path, size_t pathlen,
			   unsigned int mode)
{
	struct zip_local_header header;
	uintmax_t offset = zip_offset;
	struct zip_extra_mtime extra;
	struct zip64_extra extra64;
	size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
	int need_zip64_extra = 0;
	unsigned long attr2;
	unsigned long compressed_size;
	unsigned long crc;
	int method;
	unsigned char *out;
	void *deflated = NULL;
	void *buffer;
	struct git_istream *stream = NULL;
	unsigned long flags = 0;
	unsigned long size;
	int is_binary = -1;
	const char *path_without_prefix = path + args->baselen;
	unsigned int creator_version = 0;
	unsigned int version_needed = 10;
	size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
	size_t zip64_dir_extra_payload_size = 0;

	crc = crc32(0, NULL, 0);

	if (!has_only_ascii(path)) {
		if (is_utf8(path))
			flags |= ZIP_UTF8;
		else
			warning(_("path is not valid UTF-8: %s"), path);
	}

	if (pathlen > 0xffff) {
		return error(_("path too long (%d chars, SHA1: %s): %s"),
				(int)pathlen, oid_to_hex(oid), path);
	}

	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
		method = 0;
		attr2 = 16;
		out = NULL;
		size = 0;
		compressed_size = 0;
		buffer = NULL;
	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
		enum object_type type = oid_object_info(args->repo, oid,
							&size);

		method = 0;
		attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
			(mode & 0111) ? ((mode) << 16) : 0;
		if (S_ISLNK(mode) || (mode & 0111))
			creator_version = 0x0317;
		if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
			method = 8;

		if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
		    size > big_file_threshold) {
			stream = open_istream(oid, &type, &size, NULL);
			if (!stream)
				return error(_("cannot stream blob %s"),
					     oid_to_hex(oid));
			flags |= ZIP_STREAM;
			out = buffer = NULL;
		} else {
			buffer = object_file_to_archive(args, path, oid, mode,
							&type, &size);
			if (!buffer)
				return error(_("cannot read %s"),
					     oid_to_hex(oid));
			crc = crc32(crc, buffer, size);
			is_binary = entry_is_binary(args->repo->index,
						    path_without_prefix,
						    buffer, size);
			out = buffer;
		}
		compressed_size = (method == 0) ? size : 0;
	} else {
		return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
				oid_to_hex(oid));
	}

	if (creator_version > max_creator_version)
		max_creator_version = creator_version;

	if (buffer && method == 8) {
		out = deflated = zlib_deflate_raw(buffer, size,
						  args->compression_level,
						  &compressed_size);
		if (!out || compressed_size >= size) {
			out = buffer;
			method = 0;
			compressed_size = size;
		}
	}

	copy_le16(extra.magic, 0x5455);
	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
	extra.flags[0] = 1;	/* just mtime */
	copy_le32(extra.mtime, args->time);

	if (size > 0xffffffff || compressed_size > 0xffffffff)
		need_zip64_extra = 1;
	if (stream && size > 0x7fffffff)
		need_zip64_extra = 1;

	if (need_zip64_extra)
		version_needed = 45;

	copy_le32(header.magic, 0x04034b50);
	copy_le16(header.version, version_needed);
	copy_le16(header.flags, flags);
	copy_le16(header.compression_method, method);
	copy_le16(header.mtime, zip_time);
	copy_le16(header.mdate, zip_date);
	if (need_zip64_extra) {
		set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
		header_extra_size += ZIP64_EXTRA_SIZE;
	} else {
		set_zip_header_data_desc(&header, size, compressed_size, crc);
	}
	copy_le16(header.filename_length, pathlen);
	copy_le16(header.extra_length, header_extra_size);
	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
	zip_offset += ZIP_LOCAL_HEADER_SIZE;
	write_or_die(1, path, pathlen);
	zip_offset += pathlen;
	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
	zip_offset += ZIP_EXTRA_MTIME_SIZE;
	if (need_zip64_extra) {
		copy_le16(extra64.magic, 0x0001);
		copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
		copy_le64(extra64.size, size);
		copy_le64(extra64.compressed_size, compressed_size);
		write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
		zip_offset += ZIP64_EXTRA_SIZE;
	}

	if (stream && method == 0) {
		unsigned char buf[STREAM_BUFFER_SIZE];
		ssize_t readlen;

		for (;;) {
			readlen = read_istream(stream, buf, sizeof(buf));
			if (readlen <= 0)
				break;
			crc = crc32(crc, buf, readlen);
			if (is_binary == -1)
				is_binary = entry_is_binary(args->repo->index,
							    path_without_prefix,
							    buf, readlen);
			write_or_die(1, buf, readlen);
		}
		close_istream(stream);
		if (readlen)
			return readlen;

		compressed_size = size;
		zip_offset += compressed_size;

		write_zip_data_desc(size, compressed_size, crc);
	} else if (stream && method == 8) {
		unsigned char buf[STREAM_BUFFER_SIZE];
		ssize_t readlen;
		git_zstream zstream;
		int result;
		size_t out_len;
		unsigned char compressed[STREAM_BUFFER_SIZE * 2];

		git_deflate_init_raw(&zstream, args->compression_level);

		compressed_size = 0;
		zstream.next_out = compressed;
		zstream.avail_out = sizeof(compressed);

		for (;;) {
			readlen = read_istream(stream, buf, sizeof(buf));
			if (readlen <= 0)
				break;
			crc = crc32(crc, buf, readlen);
			if (is_binary == -1)
				is_binary = entry_is_binary(args->repo->index,
							    path_without_prefix,
							    buf, readlen);

			zstream.next_in = buf;
			zstream.avail_in = readlen;
			result = git_deflate(&zstream, 0);
			if (result != Z_OK)
				die(_("deflate error (%d)"), result);
			out_len = zstream.next_out - compressed;

			if (out_len > 0) {
				write_or_die(1, compressed, out_len);
				compressed_size += out_len;
				zstream.next_out = compressed;
				zstream.avail_out = sizeof(compressed);
			}

		}
		close_istream(stream);
		if (readlen)
			return readlen;

		zstream.next_in = buf;
		zstream.avail_in = 0;
		result = git_deflate(&zstream, Z_FINISH);
		if (result != Z_STREAM_END)
			die("deflate error (%d)", result);

		git_deflate_end(&zstream);
		out_len = zstream.next_out - compressed;
		write_or_die(1, compressed, out_len);
		compressed_size += out_len;
		zip_offset += compressed_size;

		write_zip_data_desc(size, compressed_size, crc);
	} else if (compressed_size > 0) {
		write_or_die(1, out, compressed_size);
		zip_offset += compressed_size;
	}

	free(deflated);
	free(buffer);

	if (compressed_size > 0xffffffff || size > 0xffffffff ||
	    offset > 0xffffffff) {
		if (compressed_size >= 0xffffffff)
			zip64_dir_extra_payload_size += 8;
		if (size >= 0xffffffff)
			zip64_dir_extra_payload_size += 8;
		if (offset >= 0xffffffff)
			zip64_dir_extra_payload_size += 8;
		zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
	}

	strbuf_add_le(&zip_dir, 4, 0x02014b50);	/* magic */
	strbuf_add_le(&zip_dir, 2, creator_version);
	strbuf_add_le(&zip_dir, 2, version_needed);
	strbuf_add_le(&zip_dir, 2, flags);
	strbuf_add_le(&zip_dir, 2, method);
	strbuf_add_le(&zip_dir, 2, zip_time);
	strbuf_add_le(&zip_dir, 2, zip_date);
	strbuf_add_le(&zip_dir, 4, crc);
	strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
	strbuf_add_le(&zip_dir, 4, clamp32(size));
	strbuf_add_le(&zip_dir, 2, pathlen);
	strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
	strbuf_add_le(&zip_dir, 2, 0);		/* comment length */
	strbuf_add_le(&zip_dir, 2, 0);		/* disk */
	strbuf_add_le(&zip_dir, 2, !is_binary);
	strbuf_add_le(&zip_dir, 4, attr2);
	strbuf_add_le(&zip_dir, 4, clamp32(offset));
	strbuf_add(&zip_dir, path, pathlen);
	strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
	if (zip64_dir_extra_payload_size) {
		strbuf_add_le(&zip_dir, 2, 0x0001);	/* magic */
		strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
		if (size >= 0xffffffff)
			strbuf_add_le(&zip_dir, 8, size);
		if (compressed_size >= 0xffffffff)
			strbuf_add_le(&zip_dir, 8, compressed_size);
		if (offset >= 0xffffffff)
			strbuf_add_le(&zip_dir, 8, offset);
	}
	zip_dir_entries++;

	return 0;
}

static void write_zip64_trailer(void)
{
	struct zip64_dir_trailer trailer64;
	struct zip64_dir_trailer_locator locator64;

	copy_le32(trailer64.magic, 0x06064b50);
	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
	copy_le16(trailer64.creator_version, max_creator_version);
	copy_le16(trailer64.version, 45);
	copy_le32(trailer64.disk, 0);
	copy_le32(trailer64.directory_start_disk, 0);
	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
	copy_le64(trailer64.entries, zip_dir_entries);
	copy_le64(trailer64.size, zip_dir.len);
	copy_le64(trailer64.offset, zip_offset);

	copy_le32(locator64.magic, 0x07064b50);
	copy_le32(locator64.disk, 0);
	copy_le64(locator64.offset, zip_offset + zip_dir.len);
	copy_le32(locator64.number_of_disks, 1);

	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
}

static void write_zip_trailer(const unsigned char *sha1)
{
	struct zip_dir_trailer trailer;
	int clamped = 0;

	copy_le32(trailer.magic, 0x06054b50);
	copy_le16(trailer.disk, 0);
	copy_le16(trailer.directory_start_disk, 0);
	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
			&clamped);
	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
	copy_le32(trailer.size, zip_dir.len);
	copy_le32_clamp(trailer.offset, zip_offset, &clamped);
	copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);

	write_or_die(1, zip_dir.buf, zip_dir.len);
	if (clamped)
		write_zip64_trailer();
	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
	if (sha1)
		write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
}

static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
{
	time_t time;
	struct tm *t;

	if (date_overflows(*timestamp))
		die(_("timestamp too large for this system: %"PRItime),
		    *timestamp);
	time = (time_t)*timestamp;
	t = localtime(&time);
	*timestamp = time;

	*dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
	            (t->tm_year + 1900 - 1980) * 512;
	*dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
}

static int archive_zip_config(const char *var, const char *value, void *data)
{
	return userdiff_config(var, value);
}

static int write_zip_archive(const struct archiver *ar,
			     struct archiver_args *args)
{
	int err;

	git_config(archive_zip_config, NULL);

	dos_time(&args->time, &zip_date, &zip_time);

	strbuf_init(&zip_dir, 0);

	err = write_archive_entries(args, write_zip_entry);
	if (!err)
		write_zip_trailer(args->commit_sha1);

	strbuf_release(&zip_dir);

	return err;
}

static struct archiver zip_archiver = {
	"zip",
	write_zip_archive,
	ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
};

void init_zip_archiver(void)
{
	register_archiver(&zip_archiver);
}