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range-diff: offer to dual-color the diffs
[git.git] / archive-zip.c
blobabc556e5a7506cd0fe8e1e66a83c3781bfc04104
1 /*
2 * Copyright (c) 2006 Rene Scharfe
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "archive.h"
7 #include "streaming.h"
8 #include "utf8.h"
9 #include "object-store.h"
10 #include "userdiff.h"
11 #include "xdiff-interface.h"
12
13 static int zip_date;
14 static int zip_time;
15
16 /* We only care about the "buf" part here. */
17 static struct strbuf zip_dir;
18
19 static uintmax_t zip_offset;
20 static uint64_t zip_dir_entries;
21
22 static unsigned int max_creator_version;
23
24 #define ZIP_STREAM (1 << 3)
25 #define ZIP_UTF8 (1 << 11)
26
27 struct zip_local_header {
28 unsigned char magic[4];
29 unsigned char version[2];
30 unsigned char flags[2];
31 unsigned char compression_method[2];
32 unsigned char mtime[2];
33 unsigned char mdate[2];
34 unsigned char crc32[4];
35 unsigned char compressed_size[4];
36 unsigned char size[4];
37 unsigned char filename_length[2];
38 unsigned char extra_length[2];
39 unsigned char _end[1];
40 };
41
42 struct zip_data_desc {
43 unsigned char magic[4];
44 unsigned char crc32[4];
45 unsigned char compressed_size[4];
46 unsigned char size[4];
47 unsigned char _end[1];
48 };
49
50 struct zip64_data_desc {
51 unsigned char magic[4];
52 unsigned char crc32[4];
53 unsigned char compressed_size[8];
54 unsigned char size[8];
55 unsigned char _end[1];
56 };
57
58 struct zip_dir_trailer {
59 unsigned char magic[4];
60 unsigned char disk[2];
61 unsigned char directory_start_disk[2];
62 unsigned char entries_on_this_disk[2];
63 unsigned char entries[2];
64 unsigned char size[4];
65 unsigned char offset[4];
66 unsigned char comment_length[2];
67 unsigned char _end[1];
68 };
69
70 struct zip_extra_mtime {
71 unsigned char magic[2];
72 unsigned char extra_size[2];
73 unsigned char flags[1];
74 unsigned char mtime[4];
75 unsigned char _end[1];
76 };
77
78 struct zip64_extra {
79 unsigned char magic[2];
80 unsigned char extra_size[2];
81 unsigned char size[8];
82 unsigned char compressed_size[8];
83 unsigned char _end[1];
84 };
85
86 struct zip64_dir_trailer {
87 unsigned char magic[4];
88 unsigned char record_size[8];
89 unsigned char creator_version[2];
90 unsigned char version[2];
91 unsigned char disk[4];
92 unsigned char directory_start_disk[4];
93 unsigned char entries_on_this_disk[8];
94 unsigned char entries[8];
95 unsigned char size[8];
96 unsigned char offset[8];
97 unsigned char _end[1];
98 };
99
100 struct zip64_dir_trailer_locator {
101 unsigned char magic[4];
102 unsigned char disk[4];
103 unsigned char offset[8];
104 unsigned char number_of_disks[4];
105 unsigned char _end[1];
106 };
107
108 /*
109 * On ARM, padding is added at the end of the struct, so a simple
110 * sizeof(struct ...) reports two bytes more than the payload size
111 * we're interested in.
112 */
113 #define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
114 #define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
115 #define ZIP64_DATA_DESC_SIZE offsetof(struct zip64_data_desc, _end)
116 #define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
117 #define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
118 #define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
119 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
120 (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
121 #define ZIP64_EXTRA_SIZE offsetof(struct zip64_extra, _end)
122 #define ZIP64_EXTRA_PAYLOAD_SIZE \
123 (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
124 #define ZIP64_DIR_TRAILER_SIZE offsetof(struct zip64_dir_trailer, _end)
125 #define ZIP64_DIR_TRAILER_RECORD_SIZE \
126 (ZIP64_DIR_TRAILER_SIZE - \
127 offsetof(struct zip64_dir_trailer, creator_version))
128 #define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
129 offsetof(struct zip64_dir_trailer_locator, _end)
130
131 static void copy_le16(unsigned char *dest, unsigned int n)
132 {
133 dest[0] = 0xff & n;
134 dest[1] = 0xff & (n >> 010);
135 }
136
137 static void copy_le32(unsigned char *dest, unsigned int n)
138 {
139 dest[0] = 0xff & n;
140 dest[1] = 0xff & (n >> 010);
141 dest[2] = 0xff & (n >> 020);
142 dest[3] = 0xff & (n >> 030);
143 }
144
145 static void copy_le64(unsigned char *dest, uint64_t n)
146 {
147 dest[0] = 0xff & n;
148 dest[1] = 0xff & (n >> 010);
149 dest[2] = 0xff & (n >> 020);
150 dest[3] = 0xff & (n >> 030);
151 dest[4] = 0xff & (n >> 040);
152 dest[5] = 0xff & (n >> 050);
153 dest[6] = 0xff & (n >> 060);
154 dest[7] = 0xff & (n >> 070);
155 }
156
157 static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
158 {
159 if (n <= max)
160 return n;
161 *clamped = 1;
162 return max;
163 }
164
165 static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
166 {
167 copy_le16(dest, clamp_max(n, 0xffff, clamped));
168 }
169
170 static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
171 {
172 copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
173 }
174
175 static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
176 {
177 while (size-- > 0) {
178 strbuf_addch(sb, n & 0xff);
179 n >>= 8;
180 }
181 return -!!n;
182 }
183
184 static uint32_t clamp32(uintmax_t n)
185 {
186 const uintmax_t max = 0xffffffff;
187 return (n < max) ? n : max;
188 }
189
190 static void *zlib_deflate_raw(void *data, unsigned long size,
191 int compression_level,
192 unsigned long *compressed_size)
193 {
194 git_zstream stream;
195 unsigned long maxsize;
196 void *buffer;
197 int result;
198
199 git_deflate_init_raw(&stream, compression_level);
200 maxsize = git_deflate_bound(&stream, size);
201 buffer = xmalloc(maxsize);
202
203 stream.next_in = data;
204 stream.avail_in = size;
205 stream.next_out = buffer;
206 stream.avail_out = maxsize;
207
208 do {
209 result = git_deflate(&stream, Z_FINISH);
210 } while (result == Z_OK);
211
212 if (result != Z_STREAM_END) {
213 free(buffer);
214 return NULL;
215 }
216
217 git_deflate_end(&stream);
218 *compressed_size = stream.total_out;
219
220 return buffer;
221 }
222
223 static void write_zip_data_desc(unsigned long size,
224 unsigned long compressed_size,
225 unsigned long crc)
226 {
227 if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
228 struct zip64_data_desc trailer;
229 copy_le32(trailer.magic, 0x08074b50);
230 copy_le32(trailer.crc32, crc);
231 copy_le64(trailer.compressed_size, compressed_size);
232 copy_le64(trailer.size, size);
233 write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
234 zip_offset += ZIP64_DATA_DESC_SIZE;
235 } else {
236 struct zip_data_desc trailer;
237 copy_le32(trailer.magic, 0x08074b50);
238 copy_le32(trailer.crc32, crc);
239 copy_le32(trailer.compressed_size, compressed_size);
240 copy_le32(trailer.size, size);
241 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
242 zip_offset += ZIP_DATA_DESC_SIZE;
243 }
244 }
245
246 static void set_zip_header_data_desc(struct zip_local_header *header,
247 unsigned long size,
248 unsigned long compressed_size,
249 unsigned long crc)
250 {
251 copy_le32(header->crc32, crc);
252 copy_le32(header->compressed_size, compressed_size);
253 copy_le32(header->size, size);
254 }
255
256 static int has_only_ascii(const char *s)
257 {
258 for (;;) {
259 int c = *s++;
260 if (c == '\0')
261 return 1;
262 if (!isascii(c))
263 return 0;
264 }
265 }
266
267 static int entry_is_binary(const char *path, const void *buffer, size_t size)
268 {
269 struct userdiff_driver *driver = userdiff_find_by_path(path);
270 if (!driver)
271 driver = userdiff_find_by_name("default");
272 if (driver->binary != -1)
273 return driver->binary;
274 return buffer_is_binary(buffer, size);
275 }
276
277 #define STREAM_BUFFER_SIZE (1024 * 16)
278
279 static int write_zip_entry(struct archiver_args *args,
280 const struct object_id *oid,
281 const char *path, size_t pathlen,
282 unsigned int mode)
283 {
284 struct zip_local_header header;
285 uintmax_t offset = zip_offset;
286 struct zip_extra_mtime extra;
287 struct zip64_extra extra64;
288 size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
289 int need_zip64_extra = 0;
290 unsigned long attr2;
291 unsigned long compressed_size;
292 unsigned long crc;
293 int method;
294 unsigned char *out;
295 void *deflated = NULL;
296 void *buffer;
297 struct git_istream *stream = NULL;
298 unsigned long flags = 0;
299 unsigned long size;
300 int is_binary = -1;
301 const char *path_without_prefix = path + args->baselen;
302 unsigned int creator_version = 0;
303 unsigned int version_needed = 10;
304 size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
305 size_t zip64_dir_extra_payload_size = 0;
306
307 crc = crc32(0, NULL, 0);
308
309 if (!has_only_ascii(path)) {
310 if (is_utf8(path))
311 flags |= ZIP_UTF8;
312 else
313 warning("Path is not valid UTF-8: %s", path);
314 }
315
316 if (pathlen > 0xffff) {
317 return error("path too long (%d chars, SHA1: %s): %s",
318 (int)pathlen, oid_to_hex(oid), path);
319 }
320
321 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
322 method = 0;
323 attr2 = 16;
324 out = NULL;
325 size = 0;
326 compressed_size = 0;
327 buffer = NULL;
328 } else if (S_ISREG(mode) || S_ISLNK(mode)) {
329 enum object_type type = oid_object_info(the_repository, oid,
330 &size);
331
332 method = 0;
333 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
334 (mode & 0111) ? ((mode) << 16) : 0;
335 if (S_ISLNK(mode) || (mode & 0111))
336 creator_version = 0x0317;
337 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
338 method = 8;
339
340 if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
341 size > big_file_threshold) {
342 stream = open_istream(oid, &type, &size, NULL);
343 if (!stream)
344 return error("cannot stream blob %s",
345 oid_to_hex(oid));
346 flags |= ZIP_STREAM;
347 out = buffer = NULL;
348 } else {
349 buffer = object_file_to_archive(args, path, oid, mode,
350 &type, &size);
351 if (!buffer)
352 return error("cannot read %s",
353 oid_to_hex(oid));
354 crc = crc32(crc, buffer, size);
355 is_binary = entry_is_binary(path_without_prefix,
356 buffer, size);
357 out = buffer;
358 }
359 compressed_size = (method == 0) ? size : 0;
360 } else {
361 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
362 oid_to_hex(oid));
363 }
364
365 if (creator_version > max_creator_version)
366 max_creator_version = creator_version;
367
368 if (buffer && method == 8) {
369 out = deflated = zlib_deflate_raw(buffer, size,
370 args->compression_level,
371 &compressed_size);
372 if (!out || compressed_size >= size) {
373 out = buffer;
374 method = 0;
375 compressed_size = size;
376 }
377 }
378
379 copy_le16(extra.magic, 0x5455);
380 copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
381 extra.flags[0] = 1; /* just mtime */
382 copy_le32(extra.mtime, args->time);
383
384 if (size > 0xffffffff || compressed_size > 0xffffffff)
385 need_zip64_extra = 1;
386 if (stream && size > 0x7fffffff)
387 need_zip64_extra = 1;
388
389 if (need_zip64_extra)
390 version_needed = 45;
391
392 copy_le32(header.magic, 0x04034b50);
393 copy_le16(header.version, version_needed);
394 copy_le16(header.flags, flags);
395 copy_le16(header.compression_method, method);
396 copy_le16(header.mtime, zip_time);
397 copy_le16(header.mdate, zip_date);
398 if (need_zip64_extra) {
399 set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
400 header_extra_size += ZIP64_EXTRA_SIZE;
401 } else {
402 set_zip_header_data_desc(&header, size, compressed_size, crc);
403 }
404 copy_le16(header.filename_length, pathlen);
405 copy_le16(header.extra_length, header_extra_size);
406 write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
407 zip_offset += ZIP_LOCAL_HEADER_SIZE;
408 write_or_die(1, path, pathlen);
409 zip_offset += pathlen;
410 write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
411 zip_offset += ZIP_EXTRA_MTIME_SIZE;
412 if (need_zip64_extra) {
413 copy_le16(extra64.magic, 0x0001);
414 copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
415 copy_le64(extra64.size, size);
416 copy_le64(extra64.compressed_size, compressed_size);
417 write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
418 zip_offset += ZIP64_EXTRA_SIZE;
419 }
420
421 if (stream && method == 0) {
422 unsigned char buf[STREAM_BUFFER_SIZE];
423 ssize_t readlen;
424
425 for (;;) {
426 readlen = read_istream(stream, buf, sizeof(buf));
427 if (readlen <= 0)
428 break;
429 crc = crc32(crc, buf, readlen);
430 if (is_binary == -1)
431 is_binary = entry_is_binary(path_without_prefix,
432 buf, readlen);
433 write_or_die(1, buf, readlen);
434 }
435 close_istream(stream);
436 if (readlen)
437 return readlen;
438
439 compressed_size = size;
440 zip_offset += compressed_size;
441
442 write_zip_data_desc(size, compressed_size, crc);
443 } else if (stream && method == 8) {
444 unsigned char buf[STREAM_BUFFER_SIZE];
445 ssize_t readlen;
446 git_zstream zstream;
447 int result;
448 size_t out_len;
449 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
450
451 git_deflate_init_raw(&zstream, args->compression_level);
452
453 compressed_size = 0;
454 zstream.next_out = compressed;
455 zstream.avail_out = sizeof(compressed);
456
457 for (;;) {
458 readlen = read_istream(stream, buf, sizeof(buf));
459 if (readlen <= 0)
460 break;
461 crc = crc32(crc, buf, readlen);
462 if (is_binary == -1)
463 is_binary = entry_is_binary(path_without_prefix,
464 buf, readlen);
465
466 zstream.next_in = buf;
467 zstream.avail_in = readlen;
468 result = git_deflate(&zstream, 0);
469 if (result != Z_OK)
470 die("deflate error (%d)", result);
471 out_len = zstream.next_out - compressed;
472
473 if (out_len > 0) {
474 write_or_die(1, compressed, out_len);
475 compressed_size += out_len;
476 zstream.next_out = compressed;
477 zstream.avail_out = sizeof(compressed);
478 }
479
480 }
481 close_istream(stream);
482 if (readlen)
483 return readlen;
484
485 zstream.next_in = buf;
486 zstream.avail_in = 0;
487 result = git_deflate(&zstream, Z_FINISH);
488 if (result != Z_STREAM_END)
489 die("deflate error (%d)", result);
490
491 git_deflate_end(&zstream);
492 out_len = zstream.next_out - compressed;
493 write_or_die(1, compressed, out_len);
494 compressed_size += out_len;
495 zip_offset += compressed_size;
496
497 write_zip_data_desc(size, compressed_size, crc);
498 } else if (compressed_size > 0) {
499 write_or_die(1, out, compressed_size);
500 zip_offset += compressed_size;
501 }
502
503 free(deflated);
504 free(buffer);
505
506 if (compressed_size > 0xffffffff || size > 0xffffffff ||
507 offset > 0xffffffff) {
508 if (compressed_size >= 0xffffffff)
509 zip64_dir_extra_payload_size += 8;
510 if (size >= 0xffffffff)
511 zip64_dir_extra_payload_size += 8;
512 if (offset >= 0xffffffff)
513 zip64_dir_extra_payload_size += 8;
514 zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
515 }
516
517 strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
518 strbuf_add_le(&zip_dir, 2, creator_version);
519 strbuf_add_le(&zip_dir, 2, version_needed);
520 strbuf_add_le(&zip_dir, 2, flags);
521 strbuf_add_le(&zip_dir, 2, method);
522 strbuf_add_le(&zip_dir, 2, zip_time);
523 strbuf_add_le(&zip_dir, 2, zip_date);
524 strbuf_add_le(&zip_dir, 4, crc);
525 strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
526 strbuf_add_le(&zip_dir, 4, clamp32(size));
527 strbuf_add_le(&zip_dir, 2, pathlen);
528 strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
529 strbuf_add_le(&zip_dir, 2, 0); /* comment length */
530 strbuf_add_le(&zip_dir, 2, 0); /* disk */
531 strbuf_add_le(&zip_dir, 2, !is_binary);
532 strbuf_add_le(&zip_dir, 4, attr2);
533 strbuf_add_le(&zip_dir, 4, clamp32(offset));
534 strbuf_add(&zip_dir, path, pathlen);
535 strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
536 if (zip64_dir_extra_payload_size) {
537 strbuf_add_le(&zip_dir, 2, 0x0001); /* magic */
538 strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
539 if (size >= 0xffffffff)
540 strbuf_add_le(&zip_dir, 8, size);
541 if (compressed_size >= 0xffffffff)
542 strbuf_add_le(&zip_dir, 8, compressed_size);
543 if (offset >= 0xffffffff)
544 strbuf_add_le(&zip_dir, 8, offset);
545 }
546 zip_dir_entries++;
547
548 return 0;
549 }
550
551 static void write_zip64_trailer(void)
552 {
553 struct zip64_dir_trailer trailer64;
554 struct zip64_dir_trailer_locator locator64;
555
556 copy_le32(trailer64.magic, 0x06064b50);
557 copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
558 copy_le16(trailer64.creator_version, max_creator_version);
559 copy_le16(trailer64.version, 45);
560 copy_le32(trailer64.disk, 0);
561 copy_le32(trailer64.directory_start_disk, 0);
562 copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
563 copy_le64(trailer64.entries, zip_dir_entries);
564 copy_le64(trailer64.size, zip_dir.len);
565 copy_le64(trailer64.offset, zip_offset);
566
567 copy_le32(locator64.magic, 0x07064b50);
568 copy_le32(locator64.disk, 0);
569 copy_le64(locator64.offset, zip_offset + zip_dir.len);
570 copy_le32(locator64.number_of_disks, 1);
571
572 write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
573 write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
574 }
575
576 static void write_zip_trailer(const unsigned char *sha1)
577 {
578 struct zip_dir_trailer trailer;
579 int clamped = 0;
580
581 copy_le32(trailer.magic, 0x06054b50);
582 copy_le16(trailer.disk, 0);
583 copy_le16(trailer.directory_start_disk, 0);
584 copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
585 &clamped);
586 copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
587 copy_le32(trailer.size, zip_dir.len);
588 copy_le32_clamp(trailer.offset, zip_offset, &clamped);
589 copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
590
591 write_or_die(1, zip_dir.buf, zip_dir.len);
592 if (clamped)
593 write_zip64_trailer();
594 write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
595 if (sha1)
596 write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
597 }
598
599 static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
600 {
601 time_t time;
602 struct tm *t;
603
604 if (date_overflows(*timestamp))
605 die("timestamp too large for this system: %"PRItime,
606 *timestamp);
607 time = (time_t)*timestamp;
608 t = localtime(&time);
609 *timestamp = time;
610
611 *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
612 (t->tm_year + 1900 - 1980) * 512;
613 *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
614 }
615
616 static int archive_zip_config(const char *var, const char *value, void *data)
617 {
618 return userdiff_config(var, value);
619 }
620
621 static int write_zip_archive(const struct archiver *ar,
622 struct archiver_args *args)
623 {
624 int err;
625
626 git_config(archive_zip_config, NULL);
627
628 dos_time(&args->time, &zip_date, &zip_time);
629
630 strbuf_init(&zip_dir, 0);
631
632 err = write_archive_entries(args, write_zip_entry);
633 if (!err)
634 write_zip_trailer(args->commit_sha1);
635
636 strbuf_release(&zip_dir);
637
638 return err;
639 }
640
641 static struct archiver zip_archiver = {
642 "zip",
643 write_zip_archive,
644 ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
645 };
646
647 void init_zip_archiver(void)
648 {
649 register_archiver(&zip_archiver);
650 }
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