Merge branch 'maint-1.9' into maint-2.0
[git/git.git] / archive-zip.c
CommitLineData
e4fbbfe9
RS
1/*
2 * Copyright (c) 2006 Rene Scharfe
3 */
e4fbbfe9 4#include "cache.h"
ec06bff5 5#include "archive.h"
2158f883 6#include "streaming.h"
88182bab 7#include "utf8.h"
e4fbbfe9 8
e4fbbfe9
RS
9static int zip_date;
10static int zip_time;
11
12static unsigned char *zip_dir;
13static unsigned int zip_dir_size;
14
15static unsigned int zip_offset;
16static unsigned int zip_dir_offset;
17static unsigned int zip_dir_entries;
18
19#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
88182bab
RS
20#define ZIP_STREAM (1 << 3)
21#define ZIP_UTF8 (1 << 11)
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RS
22
23struct zip_local_header {
24 unsigned char magic[4];
25 unsigned char version[2];
26 unsigned char flags[2];
27 unsigned char compression_method[2];
28 unsigned char mtime[2];
29 unsigned char mdate[2];
30 unsigned char crc32[4];
31 unsigned char compressed_size[4];
32 unsigned char size[4];
33 unsigned char filename_length[2];
34 unsigned char extra_length[2];
0ea865ce 35 unsigned char _end[1];
e4fbbfe9
RS
36};
37
2158f883
RS
38struct zip_data_desc {
39 unsigned char magic[4];
40 unsigned char crc32[4];
41 unsigned char compressed_size[4];
42 unsigned char size[4];
43 unsigned char _end[1];
44};
45
e4fbbfe9
RS
46struct zip_dir_header {
47 unsigned char magic[4];
48 unsigned char creator_version[2];
49 unsigned char version[2];
50 unsigned char flags[2];
51 unsigned char compression_method[2];
52 unsigned char mtime[2];
53 unsigned char mdate[2];
54 unsigned char crc32[4];
55 unsigned char compressed_size[4];
56 unsigned char size[4];
57 unsigned char filename_length[2];
58 unsigned char extra_length[2];
59 unsigned char comment_length[2];
60 unsigned char disk[2];
61 unsigned char attr1[2];
62 unsigned char attr2[4];
63 unsigned char offset[4];
0ea865ce 64 unsigned char _end[1];
e4fbbfe9
RS
65};
66
67struct zip_dir_trailer {
68 unsigned char magic[4];
69 unsigned char disk[2];
70 unsigned char directory_start_disk[2];
71 unsigned char entries_on_this_disk[2];
72 unsigned char entries[2];
73 unsigned char size[4];
74 unsigned char offset[4];
75 unsigned char comment_length[2];
0ea865ce 76 unsigned char _end[1];
e4fbbfe9
RS
77};
78
227bf598
RS
79struct zip_extra_mtime {
80 unsigned char magic[2];
81 unsigned char extra_size[2];
82 unsigned char flags[1];
83 unsigned char mtime[4];
84 unsigned char _end[1];
85};
86
0ea865ce
RS
87/*
88 * On ARM, padding is added at the end of the struct, so a simple
89 * sizeof(struct ...) reports two bytes more than the payload size
90 * we're interested in.
91 */
92#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
2158f883 93#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
0ea865ce
RS
94#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
95#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
227bf598
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96#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
97#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
98 (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
0ea865ce 99
e4fbbfe9
RS
100static void copy_le16(unsigned char *dest, unsigned int n)
101{
102 dest[0] = 0xff & n;
103 dest[1] = 0xff & (n >> 010);
104}
105
106static void copy_le32(unsigned char *dest, unsigned int n)
107{
108 dest[0] = 0xff & n;
109 dest[1] = 0xff & (n >> 010);
110 dest[2] = 0xff & (n >> 020);
111 dest[3] = 0xff & (n >> 030);
112}
113
c3c2e1a0
RS
114static void *zlib_deflate_raw(void *data, unsigned long size,
115 int compression_level,
116 unsigned long *compressed_size)
e4fbbfe9 117{
ef49a7a0 118 git_zstream stream;
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RS
119 unsigned long maxsize;
120 void *buffer;
121 int result;
122
123 memset(&stream, 0, sizeof(stream));
c3c2e1a0 124 git_deflate_init_raw(&stream, compression_level);
225a6f10 125 maxsize = git_deflate_bound(&stream, size);
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126 buffer = xmalloc(maxsize);
127
128 stream.next_in = data;
129 stream.avail_in = size;
130 stream.next_out = buffer;
131 stream.avail_out = maxsize;
132
133 do {
55bb5c91 134 result = git_deflate(&stream, Z_FINISH);
e4fbbfe9
RS
135 } while (result == Z_OK);
136
137 if (result != Z_STREAM_END) {
138 free(buffer);
139 return NULL;
140 }
141
55bb5c91 142 git_deflate_end(&stream);
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RS
143 *compressed_size = stream.total_out;
144
145 return buffer;
146}
147
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148static void write_zip_data_desc(unsigned long size,
149 unsigned long compressed_size,
150 unsigned long crc)
151{
152 struct zip_data_desc trailer;
153
154 copy_le32(trailer.magic, 0x08074b50);
155 copy_le32(trailer.crc32, crc);
156 copy_le32(trailer.compressed_size, compressed_size);
157 copy_le32(trailer.size, size);
158 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
159}
160
ebf5374a
RS
161static void set_zip_dir_data_desc(struct zip_dir_header *header,
162 unsigned long size,
163 unsigned long compressed_size,
164 unsigned long crc)
165{
166 copy_le32(header->crc32, crc);
167 copy_le32(header->compressed_size, compressed_size);
168 copy_le32(header->size, size);
169}
170
171static void set_zip_header_data_desc(struct zip_local_header *header,
172 unsigned long size,
173 unsigned long compressed_size,
174 unsigned long crc)
175{
176 copy_le32(header->crc32, crc);
177 copy_le32(header->compressed_size, compressed_size);
178 copy_le32(header->size, size);
179}
180
88182bab
RS
181static int has_only_ascii(const char *s)
182{
183 for (;;) {
184 int c = *s++;
185 if (c == '\0')
186 return 1;
187 if (!isascii(c))
188 return 0;
189 }
190}
191
2158f883
RS
192#define STREAM_BUFFER_SIZE (1024 * 16)
193
562e25ab 194static int write_zip_entry(struct archiver_args *args,
9cb513b7
NTND
195 const unsigned char *sha1,
196 const char *path, size_t pathlen,
197 unsigned int mode)
e4fbbfe9
RS
198{
199 struct zip_local_header header;
200 struct zip_dir_header dirent;
227bf598 201 struct zip_extra_mtime extra;
bb52d22e 202 unsigned long attr2;
e4fbbfe9 203 unsigned long compressed_size;
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RS
204 unsigned long crc;
205 unsigned long direntsize;
e4fbbfe9 206 int method;
e4fbbfe9 207 unsigned char *out;
e4fbbfe9 208 void *deflated = NULL;
9cb513b7 209 void *buffer;
2158f883
RS
210 struct git_istream *stream = NULL;
211 unsigned long flags = 0;
9cb513b7 212 unsigned long size;
e4fbbfe9 213
38f4d138 214 crc = crc32(0, NULL, 0);
e4fbbfe9 215
88182bab
RS
216 if (!has_only_ascii(path)) {
217 if (is_utf8(path))
218 flags |= ZIP_UTF8;
219 else
220 warning("Path is not valid UTF-8: %s", path);
221 }
222
e4fbbfe9 223 if (pathlen > 0xffff) {
562e25ab
RS
224 return error("path too long (%d chars, SHA1: %s): %s",
225 (int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9
RS
226 }
227
302b9282 228 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
e4fbbfe9 229 method = 0;
62cdce17 230 attr2 = 16;
e4fbbfe9 231 out = NULL;
60df6bd1 232 size = 0;
e4fbbfe9 233 compressed_size = 0;
9cb513b7 234 buffer = NULL;
62cdce17 235 } else if (S_ISREG(mode) || S_ISLNK(mode)) {
2158f883 236 enum object_type type = sha1_object_info(sha1, &size);
9cb513b7 237
62cdce17 238 method = 0;
bb52d22e
JH
239 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
240 (mode & 0111) ? ((mode) << 16) : 0;
2158f883 241 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17 242 method = 8;
2158f883
RS
243
244 if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215 245 size > big_file_threshold) {
2158f883
RS
246 stream = open_istream(sha1, &type, &size, NULL);
247 if (!stream)
248 return error("cannot stream blob %s",
249 sha1_to_hex(sha1));
250 flags |= ZIP_STREAM;
251 out = buffer = NULL;
252 } else {
253 buffer = sha1_file_to_archive(args, path, sha1, mode,
254 &type, &size);
255 if (!buffer)
256 return error("cannot read %s",
257 sha1_to_hex(sha1));
258 crc = crc32(crc, buffer, size);
259 out = buffer;
260 }
d3c1472f 261 compressed_size = (method == 0) ? size : 0;
e4fbbfe9 262 } else {
562e25ab
RS
263 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
264 sha1_to_hex(sha1));
e4fbbfe9
RS
265 }
266
2158f883 267 if (buffer && method == 8) {
c3c2e1a0
RS
268 out = deflated = zlib_deflate_raw(buffer, size,
269 args->compression_level,
270 &compressed_size);
271 if (!out || compressed_size >= size) {
272 out = buffer;
e4fbbfe9
RS
273 method = 0;
274 compressed_size = size;
275 }
276 }
277
227bf598
RS
278 copy_le16(extra.magic, 0x5455);
279 copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
280 extra.flags[0] = 1; /* just mtime */
281 copy_le32(extra.mtime, args->time);
282
e4fbbfe9 283 /* make sure we have enough free space in the dictionary */
227bf598 284 direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
e4fbbfe9
RS
285 while (zip_dir_size < zip_dir_offset + direntsize) {
286 zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
287 zip_dir = xrealloc(zip_dir, zip_dir_size);
288 }
289
290 copy_le32(dirent.magic, 0x02014b50);
bb52d22e
JH
291 copy_le16(dirent.creator_version,
292 S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
cf72fb07 293 copy_le16(dirent.version, 10);
2158f883 294 copy_le16(dirent.flags, flags);
e4fbbfe9
RS
295 copy_le16(dirent.compression_method, method);
296 copy_le16(dirent.mtime, zip_time);
297 copy_le16(dirent.mdate, zip_date);
ebf5374a 298 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
e4fbbfe9 299 copy_le16(dirent.filename_length, pathlen);
227bf598 300 copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
e4fbbfe9
RS
301 copy_le16(dirent.comment_length, 0);
302 copy_le16(dirent.disk, 0);
303 copy_le16(dirent.attr1, 0);
62cdce17 304 copy_le32(dirent.attr2, attr2);
e4fbbfe9 305 copy_le32(dirent.offset, zip_offset);
e4fbbfe9
RS
306
307 copy_le32(header.magic, 0x04034b50);
cf72fb07 308 copy_le16(header.version, 10);
2158f883 309 copy_le16(header.flags, flags);
e4fbbfe9
RS
310 copy_le16(header.compression_method, method);
311 copy_le16(header.mtime, zip_time);
312 copy_le16(header.mdate, zip_date);
5ea2c847 313 set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9 314 copy_le16(header.filename_length, pathlen);
227bf598 315 copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
0ea865ce
RS
316 write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
317 zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9
RS
318 write_or_die(1, path, pathlen);
319 zip_offset += pathlen;
227bf598
RS
320 write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
321 zip_offset += ZIP_EXTRA_MTIME_SIZE;
2158f883
RS
322 if (stream && method == 0) {
323 unsigned char buf[STREAM_BUFFER_SIZE];
324 ssize_t readlen;
325
326 for (;;) {
327 readlen = read_istream(stream, buf, sizeof(buf));
328 if (readlen <= 0)
329 break;
330 crc = crc32(crc, buf, readlen);
331 write_or_die(1, buf, readlen);
332 }
333 close_istream(stream);
334 if (readlen)
335 return readlen;
336
337 compressed_size = size;
338 zip_offset += compressed_size;
339
340 write_zip_data_desc(size, compressed_size, crc);
341 zip_offset += ZIP_DATA_DESC_SIZE;
342
c743c215
RS
343 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
344 } else if (stream && method == 8) {
345 unsigned char buf[STREAM_BUFFER_SIZE];
346 ssize_t readlen;
347 git_zstream zstream;
348 int result;
349 size_t out_len;
350 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
351
352 memset(&zstream, 0, sizeof(zstream));
c3c2e1a0 353 git_deflate_init_raw(&zstream, args->compression_level);
c743c215
RS
354
355 compressed_size = 0;
356 zstream.next_out = compressed;
357 zstream.avail_out = sizeof(compressed);
358
359 for (;;) {
360 readlen = read_istream(stream, buf, sizeof(buf));
361 if (readlen <= 0)
362 break;
363 crc = crc32(crc, buf, readlen);
364
365 zstream.next_in = buf;
366 zstream.avail_in = readlen;
367 result = git_deflate(&zstream, 0);
368 if (result != Z_OK)
369 die("deflate error (%d)", result);
c3c2e1a0 370 out_len = zstream.next_out - compressed;
c743c215
RS
371
372 if (out_len > 0) {
c3c2e1a0 373 write_or_die(1, compressed, out_len);
c743c215
RS
374 compressed_size += out_len;
375 zstream.next_out = compressed;
376 zstream.avail_out = sizeof(compressed);
377 }
378
379 }
380 close_istream(stream);
381 if (readlen)
382 return readlen;
383
384 zstream.next_in = buf;
385 zstream.avail_in = 0;
386 result = git_deflate(&zstream, Z_FINISH);
387 if (result != Z_STREAM_END)
388 die("deflate error (%d)", result);
389
390 git_deflate_end(&zstream);
c3c2e1a0
RS
391 out_len = zstream.next_out - compressed;
392 write_or_die(1, compressed, out_len);
c743c215
RS
393 compressed_size += out_len;
394 zip_offset += compressed_size;
395
396 write_zip_data_desc(size, compressed_size, crc);
397 zip_offset += ZIP_DATA_DESC_SIZE;
398
2158f883
RS
399 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
400 } else if (compressed_size > 0) {
e4fbbfe9
RS
401 write_or_die(1, out, compressed_size);
402 zip_offset += compressed_size;
403 }
404
e4fbbfe9 405 free(deflated);
9cb513b7 406 free(buffer);
e4fbbfe9 407
ebf5374a
RS
408 memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
409 zip_dir_offset += ZIP_DIR_HEADER_SIZE;
410 memcpy(zip_dir + zip_dir_offset, path, pathlen);
411 zip_dir_offset += pathlen;
227bf598
RS
412 memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
413 zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
ebf5374a
RS
414 zip_dir_entries++;
415
562e25ab 416 return 0;
e4fbbfe9
RS
417}
418
419static void write_zip_trailer(const unsigned char *sha1)
420{
421 struct zip_dir_trailer trailer;
422
423 copy_le32(trailer.magic, 0x06054b50);
424 copy_le16(trailer.disk, 0);
425 copy_le16(trailer.directory_start_disk, 0);
426 copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
427 copy_le16(trailer.entries, zip_dir_entries);
428 copy_le32(trailer.size, zip_dir_offset);
429 copy_le32(trailer.offset, zip_offset);
430 copy_le16(trailer.comment_length, sha1 ? 40 : 0);
431
432 write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce 433 write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9
RS
434 if (sha1)
435 write_or_die(1, sha1_to_hex(sha1), 40);
436}
437
438static void dos_time(time_t *time, int *dos_date, int *dos_time)
439{
440 struct tm *t = localtime(time);
441
442 *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
443 (t->tm_year + 1900 - 1980) * 512;
444 *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
445}
446
4d7c9898
JK
447static int write_zip_archive(const struct archiver *ar,
448 struct archiver_args *args)
ec06bff5 449{
562e25ab
RS
450 int err;
451
ec06bff5
FBH
452 dos_time(&args->time, &zip_date, &zip_time);
453
454 zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
455 zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab
RS
456
457 err = write_archive_entries(args, write_zip_entry);
458 if (!err)
459 write_zip_trailer(args->commit_sha1);
ec06bff5
FBH
460
461 free(zip_dir);
462
562e25ab 463 return err;
ec06bff5 464}
13e0f88d
JK
465
466static struct archiver zip_archiver = {
467 "zip",
468 write_zip_archive,
7b97730b 469 ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
13e0f88d
JK
470};
471
472void init_zip_archiver(void)
473{
474 register_archiver(&zip_archiver);
475}