git

1
/*
2
 * Copyright (c) 2006 Rene Scharfe
3
 */
4

5
#define USE_THE_REPOSITORY_VARIABLE
6

7
#include "git-compat-util.h"
8
#include "config.h"
9
#include "archive.h"
10
#include "gettext.h"
11
#include "git-zlib.h"
12
#include "hex.h"
13
#include "streaming.h"
14
#include "utf8.h"
15
#include "object-store-ll.h"
16
#include "strbuf.h"
17
#include "userdiff.h"
18
#include "write-or-die.h"
19
#include "xdiff-interface.h"
20
#include "date.h"
21

22
static int zip_date;
23
static int zip_time;
24

25
/* We only care about the "buf" part here. */
26
static struct strbuf zip_dir;
27

28
static uintmax_t zip_offset;
29
static uint64_t zip_dir_entries;
30

31
static unsigned int max_creator_version;
32

33
#define ZIP_STREAM	(1 <<  3)
34
#define ZIP_UTF8	(1 << 11)
35

36
enum zip_method {
37
	ZIP_METHOD_STORE = 0,
38
	ZIP_METHOD_DEFLATE = 8
39
};
40

41
struct zip_local_header {
42
	unsigned char magic[4];
43
	unsigned char version[2];
44
	unsigned char flags[2];
45
	unsigned char compression_method[2];
46
	unsigned char mtime[2];
47
	unsigned char mdate[2];
48
	unsigned char crc32[4];
49
	unsigned char compressed_size[4];
50
	unsigned char size[4];
51
	unsigned char filename_length[2];
52
	unsigned char extra_length[2];
53
	unsigned char _end[1];
54
};
55

56
struct zip_data_desc {
57
	unsigned char magic[4];
58
	unsigned char crc32[4];
59
	unsigned char compressed_size[4];
60
	unsigned char size[4];
61
	unsigned char _end[1];
62
};
63

64
struct zip64_data_desc {
65
	unsigned char magic[4];
66
	unsigned char crc32[4];
67
	unsigned char compressed_size[8];
68
	unsigned char size[8];
69
	unsigned char _end[1];
70
};
71

72
struct zip_dir_trailer {
73
	unsigned char magic[4];
74
	unsigned char disk[2];
75
	unsigned char directory_start_disk[2];
76
	unsigned char entries_on_this_disk[2];
77
	unsigned char entries[2];
78
	unsigned char size[4];
79
	unsigned char offset[4];
80
	unsigned char comment_length[2];
81
	unsigned char _end[1];
82
};
83

84
struct zip_extra_mtime {
85
	unsigned char magic[2];
86
	unsigned char extra_size[2];
87
	unsigned char flags[1];
88
	unsigned char mtime[4];
89
	unsigned char _end[1];
90
};
91

92
struct zip64_extra {
93
	unsigned char magic[2];
94
	unsigned char extra_size[2];
95
	unsigned char size[8];
96
	unsigned char compressed_size[8];
97
	unsigned char _end[1];
98
};
99

100
struct zip64_dir_trailer {
101
	unsigned char magic[4];
102
	unsigned char record_size[8];
103
	unsigned char creator_version[2];
104
	unsigned char version[2];
105
	unsigned char disk[4];
106
	unsigned char directory_start_disk[4];
107
	unsigned char entries_on_this_disk[8];
108
	unsigned char entries[8];
109
	unsigned char size[8];
110
	unsigned char offset[8];
111
	unsigned char _end[1];
112
};
113

114
struct zip64_dir_trailer_locator {
115
	unsigned char magic[4];
116
	unsigned char disk[4];
117
	unsigned char offset[8];
118
	unsigned char number_of_disks[4];
119
	unsigned char _end[1];
120
};
121

122
/*
123
 * On ARM, padding is added at the end of the struct, so a simple
124
 * sizeof(struct ...) reports two bytes more than the payload size
125
 * we're interested in.
126
 */
127
#define ZIP_LOCAL_HEADER_SIZE	offsetof(struct zip_local_header, _end)
128
#define ZIP_DATA_DESC_SIZE	offsetof(struct zip_data_desc, _end)
129
#define ZIP64_DATA_DESC_SIZE	offsetof(struct zip64_data_desc, _end)
130
#define ZIP_DIR_HEADER_SIZE	offsetof(struct zip_dir_header, _end)
131
#define ZIP_DIR_TRAILER_SIZE	offsetof(struct zip_dir_trailer, _end)
132
#define ZIP_EXTRA_MTIME_SIZE	offsetof(struct zip_extra_mtime, _end)
133
#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
134
	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
135
#define ZIP64_EXTRA_SIZE	offsetof(struct zip64_extra, _end)
136
#define ZIP64_EXTRA_PAYLOAD_SIZE \
137
	(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
138
#define ZIP64_DIR_TRAILER_SIZE	offsetof(struct zip64_dir_trailer, _end)
139
#define ZIP64_DIR_TRAILER_RECORD_SIZE \
140
	(ZIP64_DIR_TRAILER_SIZE - \
141
	 offsetof(struct zip64_dir_trailer, creator_version))
142
#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
143
	offsetof(struct zip64_dir_trailer_locator, _end)
144

145
static void copy_le16(unsigned char *dest, unsigned int n)
146
{
147
	dest[0] = 0xff & n;
148
	dest[1] = 0xff & (n >> 010);
149
}
150

151
static void copy_le32(unsigned char *dest, unsigned int n)
152
{
153
	dest[0] = 0xff & n;
154
	dest[1] = 0xff & (n >> 010);
155
	dest[2] = 0xff & (n >> 020);
156
	dest[3] = 0xff & (n >> 030);
157
}
158

159
static void copy_le64(unsigned char *dest, uint64_t n)
160
{
161
	dest[0] = 0xff & n;
162
	dest[1] = 0xff & (n >> 010);
163
	dest[2] = 0xff & (n >> 020);
164
	dest[3] = 0xff & (n >> 030);
165
	dest[4] = 0xff & (n >> 040);
166
	dest[5] = 0xff & (n >> 050);
167
	dest[6] = 0xff & (n >> 060);
168
	dest[7] = 0xff & (n >> 070);
169
}
170

171
static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
172
{
173
	if (n <= max)
174
		return n;
175
	*clamped = 1;
176
	return max;
177
}
178

179
static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
180
{
181
	copy_le16(dest, clamp_max(n, 0xffff, clamped));
182
}
183

184
static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
185
{
186
	copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
187
}
188

189
static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
190
{
191
	while (size-- > 0) {
192
		strbuf_addch(sb, n & 0xff);
193
		n >>= 8;
194
	}
195
	return -!!n;
196
}
197

198
static uint32_t clamp32(uintmax_t n)
199
{
200
	const uintmax_t max = 0xffffffff;
201
	return (n < max) ? n : max;
202
}
203

204
static void *zlib_deflate_raw(void *data, unsigned long size,
205
			      int compression_level,
206
			      unsigned long *compressed_size)
207
{
208
	git_zstream stream;
209
	unsigned long maxsize;
210
	void *buffer;
211
	int result;
212

213
	git_deflate_init_raw(&stream, compression_level);
214
	maxsize = git_deflate_bound(&stream, size);
215
	buffer = xmalloc(maxsize);
216

217
	stream.next_in = data;
218
	stream.avail_in = size;
219
	stream.next_out = buffer;
220
	stream.avail_out = maxsize;
221

222
	do {
223
		result = git_deflate(&stream, Z_FINISH);
224
	} while (result == Z_OK);
225

226
	if (result != Z_STREAM_END) {
227
		free(buffer);
228
		return NULL;
229
	}
230

231
	git_deflate_end(&stream);
232
	*compressed_size = stream.total_out;
233

234
	return buffer;
235
}
236

237
static void write_zip_data_desc(unsigned long size,
238
				unsigned long compressed_size,
239
				unsigned long crc)
240
{
241
	if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
242
		struct zip64_data_desc trailer;
243
		copy_le32(trailer.magic, 0x08074b50);
244
		copy_le32(trailer.crc32, crc);
245
		copy_le64(trailer.compressed_size, compressed_size);
246
		copy_le64(trailer.size, size);
247
		write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
248
		zip_offset += ZIP64_DATA_DESC_SIZE;
249
	} else {
250
		struct zip_data_desc trailer;
251
		copy_le32(trailer.magic, 0x08074b50);
252
		copy_le32(trailer.crc32, crc);
253
		copy_le32(trailer.compressed_size, compressed_size);
254
		copy_le32(trailer.size, size);
255
		write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
256
		zip_offset += ZIP_DATA_DESC_SIZE;
257
	}
258
}
259

260
static void set_zip_header_data_desc(struct zip_local_header *header,
261
				     unsigned long size,
262
				     unsigned long compressed_size,
263
				     unsigned long crc)
264
{
265
	copy_le32(header->crc32, crc);
266
	copy_le32(header->compressed_size, compressed_size);
267
	copy_le32(header->size, size);
268
}
269

270
static int has_only_ascii(const char *s)
271
{
272
	for (;;) {
273
		int c = *s++;
274
		if (c == '\0')
275
			return 1;
276
		if (!isascii(c))
277
			return 0;
278
	}
279
}
280

281
static int entry_is_binary(struct index_state *istate, const char *path,
282
			   const void *buffer, size_t size)
283
{
284
	struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
285
	if (!driver)
286
		driver = userdiff_find_by_name("default");
287
	if (driver->binary != -1)
288
		return driver->binary;
289
	return buffer_is_binary(buffer, size);
290
}
291

292
#define STREAM_BUFFER_SIZE (1024 * 16)
293

294
static int write_zip_entry(struct archiver_args *args,
295
			   const struct object_id *oid,
296
			   const char *path, size_t pathlen,
297
			   unsigned int mode,
298
			   void *buffer, unsigned long size)
299
{
300
	struct zip_local_header header;
301
	uintmax_t offset = zip_offset;
302
	struct zip_extra_mtime extra;
303
	struct zip64_extra extra64;
304
	size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
305
	int need_zip64_extra = 0;
306
	unsigned long attr2;
307
	unsigned long compressed_size;
308
	unsigned long crc;
309
	enum zip_method method;
310
	unsigned char *out;
311
	void *deflated = NULL;
312
	struct git_istream *stream = NULL;
313
	unsigned long flags = 0;
314
	int is_binary = -1;
315
	const char *path_without_prefix = path + args->baselen;
316
	unsigned int creator_version = 0;
317
	unsigned int version_needed = 10;
318
	size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
319
	size_t zip64_dir_extra_payload_size = 0;
320

321
	crc = crc32(0, NULL, 0);
322

323
	if (!has_only_ascii(path)) {
324
		if (is_utf8(path))
325
			flags |= ZIP_UTF8;
326
		else
327
			warning(_("path is not valid UTF-8: %s"), path);
328
	}
329

330
	if (pathlen > 0xffff) {
331
		return error(_("path too long (%d chars, SHA1: %s): %s"),
332
				(int)pathlen, oid_to_hex(oid), path);
333
	}
334

335
	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
336
		method = ZIP_METHOD_STORE;
337
		attr2 = 16;
338
		out = NULL;
339
		compressed_size = 0;
340
	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
341
		method = ZIP_METHOD_STORE;
342
		attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
343
			(mode & 0111) ? ((mode) << 16) : 0;
344
		if (S_ISLNK(mode) || (mode & 0111))
345
			creator_version = 0x0317;
346
		if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
347
			method = ZIP_METHOD_DEFLATE;
348

349
		if (!buffer) {
350
			enum object_type type;
351
			stream = open_istream(args->repo, oid, &type, &size,
352
					      NULL);
353
			if (!stream)
354
				return error(_("cannot stream blob %s"),
355
					     oid_to_hex(oid));
356
			flags |= ZIP_STREAM;
357
			out = NULL;
358
		} else {
359
			crc = crc32(crc, buffer, size);
360
			is_binary = entry_is_binary(args->repo->index,
361
						    path_without_prefix,
362
						    buffer, size);
363
			out = buffer;
364
		}
365
		compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
366
	} else {
367
		return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
368
				oid_to_hex(oid));
369
	}
370

371
	if (creator_version > max_creator_version)
372
		max_creator_version = creator_version;
373

374
	if (buffer && method == ZIP_METHOD_DEFLATE) {
375
		out = deflated = zlib_deflate_raw(buffer, size,
376
						  args->compression_level,
377
						  &compressed_size);
378
		if (!out || compressed_size >= size) {
379
			out = buffer;
380
			method = ZIP_METHOD_STORE;
381
			compressed_size = size;
382
		}
383
	}
384

385
	copy_le16(extra.magic, 0x5455);
386
	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
387
	extra.flags[0] = 1;	/* just mtime */
388
	copy_le32(extra.mtime, args->time);
389

390
	if (size > 0xffffffff || compressed_size > 0xffffffff)
391
		need_zip64_extra = 1;
392
	if (stream && size > 0x7fffffff)
393
		need_zip64_extra = 1;
394

395
	if (need_zip64_extra)
396
		version_needed = 45;
397

398
	copy_le32(header.magic, 0x04034b50);
399
	copy_le16(header.version, version_needed);
400
	copy_le16(header.flags, flags);
401
	copy_le16(header.compression_method, method);
402
	copy_le16(header.mtime, zip_time);
403
	copy_le16(header.mdate, zip_date);
404
	if (need_zip64_extra) {
405
		set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
406
		header_extra_size += ZIP64_EXTRA_SIZE;
407
	} else {
408
		set_zip_header_data_desc(&header, size, compressed_size, crc);
409
	}
410
	copy_le16(header.filename_length, pathlen);
411
	copy_le16(header.extra_length, header_extra_size);
412
	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
413
	zip_offset += ZIP_LOCAL_HEADER_SIZE;
414
	write_or_die(1, path, pathlen);
415
	zip_offset += pathlen;
416
	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
417
	zip_offset += ZIP_EXTRA_MTIME_SIZE;
418
	if (need_zip64_extra) {
419
		copy_le16(extra64.magic, 0x0001);
420
		copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
421
		copy_le64(extra64.size, size);
422
		copy_le64(extra64.compressed_size, compressed_size);
423
		write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
424
		zip_offset += ZIP64_EXTRA_SIZE;
425
	}
426

427
	if (stream && method == ZIP_METHOD_STORE) {
428
		unsigned char buf[STREAM_BUFFER_SIZE];
429
		ssize_t readlen;
430

431
		for (;;) {
432
			readlen = read_istream(stream, buf, sizeof(buf));
433
			if (readlen <= 0)
434
				break;
435
			crc = crc32(crc, buf, readlen);
436
			if (is_binary == -1)
437
				is_binary = entry_is_binary(args->repo->index,
438
							    path_without_prefix,
439
							    buf, readlen);
440
			write_or_die(1, buf, readlen);
441
		}
442
		close_istream(stream);
443
		if (readlen)
444
			return readlen;
445

446
		compressed_size = size;
447
		zip_offset += compressed_size;
448

449
		write_zip_data_desc(size, compressed_size, crc);
450
	} else if (stream && method == ZIP_METHOD_DEFLATE) {
451
		unsigned char buf[STREAM_BUFFER_SIZE];
452
		ssize_t readlen;
453
		git_zstream zstream;
454
		int result;
455
		size_t out_len;
456
		unsigned char compressed[STREAM_BUFFER_SIZE * 2];
457

458
		git_deflate_init_raw(&zstream, args->compression_level);
459

460
		compressed_size = 0;
461
		zstream.next_out = compressed;
462
		zstream.avail_out = sizeof(compressed);
463

464
		for (;;) {
465
			readlen = read_istream(stream, buf, sizeof(buf));
466
			if (readlen <= 0)
467
				break;
468
			crc = crc32(crc, buf, readlen);
469
			if (is_binary == -1)
470
				is_binary = entry_is_binary(args->repo->index,
471
							    path_without_prefix,
472
							    buf, readlen);
473

474
			zstream.next_in = buf;
475
			zstream.avail_in = readlen;
476
			result = git_deflate(&zstream, 0);
477
			if (result != Z_OK)
478
				die(_("deflate error (%d)"), result);
479
			out_len = zstream.next_out - compressed;
480

481
			if (out_len > 0) {
482
				write_or_die(1, compressed, out_len);
483
				compressed_size += out_len;
484
				zstream.next_out = compressed;
485
				zstream.avail_out = sizeof(compressed);
486
			}
487

488
		}
489
		close_istream(stream);
490
		if (readlen)
491
			return readlen;
492

493
		zstream.next_in = buf;
494
		zstream.avail_in = 0;
495
		result = git_deflate(&zstream, Z_FINISH);
496
		if (result != Z_STREAM_END)
497
			die("deflate error (%d)", result);
498

499
		git_deflate_end(&zstream);
500
		out_len = zstream.next_out - compressed;
501
		write_or_die(1, compressed, out_len);
502
		compressed_size += out_len;
503
		zip_offset += compressed_size;
504

505
		write_zip_data_desc(size, compressed_size, crc);
506
	} else if (compressed_size > 0) {
507
		write_or_die(1, out, compressed_size);
508
		zip_offset += compressed_size;
509
	}
510

511
	free(deflated);
512

513
	if (compressed_size > 0xffffffff || size > 0xffffffff ||
514
	    offset > 0xffffffff) {
515
		if (compressed_size >= 0xffffffff)
516
			zip64_dir_extra_payload_size += 8;
517
		if (size >= 0xffffffff)
518
			zip64_dir_extra_payload_size += 8;
519
		if (offset >= 0xffffffff)
520
			zip64_dir_extra_payload_size += 8;
521
		zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
522
	}
523

524
	strbuf_add_le(&zip_dir, 4, 0x02014b50);	/* magic */
525
	strbuf_add_le(&zip_dir, 2, creator_version);
526
	strbuf_add_le(&zip_dir, 2, version_needed);
527
	strbuf_add_le(&zip_dir, 2, flags);
528
	strbuf_add_le(&zip_dir, 2, method);
529
	strbuf_add_le(&zip_dir, 2, zip_time);
530
	strbuf_add_le(&zip_dir, 2, zip_date);
531
	strbuf_add_le(&zip_dir, 4, crc);
532
	strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
533
	strbuf_add_le(&zip_dir, 4, clamp32(size));
534
	strbuf_add_le(&zip_dir, 2, pathlen);
535
	strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
536
	strbuf_add_le(&zip_dir, 2, 0);		/* comment length */
537
	strbuf_add_le(&zip_dir, 2, 0);		/* disk */
538
	strbuf_add_le(&zip_dir, 2, !is_binary);
539
	strbuf_add_le(&zip_dir, 4, attr2);
540
	strbuf_add_le(&zip_dir, 4, clamp32(offset));
541
	strbuf_add(&zip_dir, path, pathlen);
542
	strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
543
	if (zip64_dir_extra_payload_size) {
544
		strbuf_add_le(&zip_dir, 2, 0x0001);	/* magic */
545
		strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
546
		if (size >= 0xffffffff)
547
			strbuf_add_le(&zip_dir, 8, size);
548
		if (compressed_size >= 0xffffffff)
549
			strbuf_add_le(&zip_dir, 8, compressed_size);
550
		if (offset >= 0xffffffff)
551
			strbuf_add_le(&zip_dir, 8, offset);
552
	}
553
	zip_dir_entries++;
554

555
	return 0;
556
}
557

558
static void write_zip64_trailer(void)
559
{
560
	struct zip64_dir_trailer trailer64;
561
	struct zip64_dir_trailer_locator locator64;
562

563
	copy_le32(trailer64.magic, 0x06064b50);
564
	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
565
	copy_le16(trailer64.creator_version, max_creator_version);
566
	copy_le16(trailer64.version, 45);
567
	copy_le32(trailer64.disk, 0);
568
	copy_le32(trailer64.directory_start_disk, 0);
569
	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
570
	copy_le64(trailer64.entries, zip_dir_entries);
571
	copy_le64(trailer64.size, zip_dir.len);
572
	copy_le64(trailer64.offset, zip_offset);
573

574
	copy_le32(locator64.magic, 0x07064b50);
575
	copy_le32(locator64.disk, 0);
576
	copy_le64(locator64.offset, zip_offset + zip_dir.len);
577
	copy_le32(locator64.number_of_disks, 1);
578

579
	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
580
	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
581
}
582

583
static void write_zip_trailer(const struct object_id *oid)
584
{
585
	struct zip_dir_trailer trailer;
586
	int clamped = 0;
587

588
	copy_le32(trailer.magic, 0x06054b50);
589
	copy_le16(trailer.disk, 0);
590
	copy_le16(trailer.directory_start_disk, 0);
591
	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
592
			&clamped);
593
	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
594
	copy_le32(trailer.size, zip_dir.len);
595
	copy_le32_clamp(trailer.offset, zip_offset, &clamped);
596
	copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
597

598
	write_or_die(1, zip_dir.buf, zip_dir.len);
599
	if (clamped)
600
		write_zip64_trailer();
601
	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
602
	if (oid)
603
		write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
604
}
605

606
static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
607
{
608
	time_t time;
609
	struct tm tm;
610

611
	if (date_overflows(*timestamp))
612
		die(_("timestamp too large for this system: %"PRItime),
613
		    *timestamp);
614
	time = (time_t)*timestamp;
615
	localtime_r(&time, &tm);
616
	*timestamp = time;
617

618
	*dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +
619
		    (tm.tm_year + 1900 - 1980) * 512;
620
	*dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;
621
}
622

623
static int archive_zip_config(const char *var, const char *value,
624
			      const struct config_context *ctx UNUSED,
625
			      void *data UNUSED)
626
{
627
	return userdiff_config(var, value);
628
}
629

630
static int write_zip_archive(const struct archiver *ar UNUSED,
631
			     struct archiver_args *args)
632
{
633
	int err;
634

635
	git_config(archive_zip_config, NULL);
636

637
	dos_time(&args->time, &zip_date, &zip_time);
638

639
	strbuf_init(&zip_dir, 0);
640

641
	err = write_archive_entries(args, write_zip_entry);
642
	if (!err)
643
		write_zip_trailer(args->commit_oid);
644

645
	strbuf_release(&zip_dir);
646

647
	return err;
648
}
649

650
static struct archiver zip_archiver = {
651
	.name = "zip",
652
	.write_archive = write_zip_archive,
653
	.flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
654
};
655

656
void init_zip_archiver(void)
657
{
658
	register_archiver(&zip_archiver);
659
}
660