archive-zip:write_zip_entry: Remove second reset of size variable to zero.
[git/git.git] / archive-zip.c
1 /*
2 * Copyright (c) 2006 Rene Scharfe
3 */
4 #include "cache.h"
5 #include "archive.h"
6 #include "streaming.h"
7 #include "utf8.h"
8
9 static int zip_date;
10 static int zip_time;
11
12 static unsigned char *zip_dir;
13 static unsigned int zip_dir_size;
14
15 static unsigned int zip_offset;
16 static unsigned int zip_dir_offset;
17 static unsigned int zip_dir_entries;
18
19 #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
20 #define ZIP_STREAM (1 << 3)
21 #define ZIP_UTF8 (1 << 11)
22
23 struct 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];
35 unsigned char _end[1];
36 };
37
38 struct 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
46 struct 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];
64 unsigned char _end[1];
65 };
66
67 struct 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];
76 unsigned char _end[1];
77 };
78
79 struct 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
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)
93 #define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
94 #define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
95 #define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
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))
99
100 static void copy_le16(unsigned char *dest, unsigned int n)
101 {
102 dest[0] = 0xff & n;
103 dest[1] = 0xff & (n >> 010);
104 }
105
106 static 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
114 static void *zlib_deflate(void *data, unsigned long size,
115 int compression_level, unsigned long *compressed_size)
116 {
117 git_zstream stream;
118 unsigned long maxsize;
119 void *buffer;
120 int result;
121
122 memset(&stream, 0, sizeof(stream));
123 git_deflate_init(&stream, compression_level);
124 maxsize = git_deflate_bound(&stream, size);
125 buffer = xmalloc(maxsize);
126
127 stream.next_in = data;
128 stream.avail_in = size;
129 stream.next_out = buffer;
130 stream.avail_out = maxsize;
131
132 do {
133 result = git_deflate(&stream, Z_FINISH);
134 } while (result == Z_OK);
135
136 if (result != Z_STREAM_END) {
137 free(buffer);
138 return NULL;
139 }
140
141 git_deflate_end(&stream);
142 *compressed_size = stream.total_out;
143
144 return buffer;
145 }
146
147 static void write_zip_data_desc(unsigned long size,
148 unsigned long compressed_size,
149 unsigned long crc)
150 {
151 struct zip_data_desc trailer;
152
153 copy_le32(trailer.magic, 0x08074b50);
154 copy_le32(trailer.crc32, crc);
155 copy_le32(trailer.compressed_size, compressed_size);
156 copy_le32(trailer.size, size);
157 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
158 }
159
160 static void set_zip_dir_data_desc(struct zip_dir_header *header,
161 unsigned long size,
162 unsigned long compressed_size,
163 unsigned long crc)
164 {
165 copy_le32(header->crc32, crc);
166 copy_le32(header->compressed_size, compressed_size);
167 copy_le32(header->size, size);
168 }
169
170 static void set_zip_header_data_desc(struct zip_local_header *header,
171 unsigned long size,
172 unsigned long compressed_size,
173 unsigned long crc)
174 {
175 copy_le32(header->crc32, crc);
176 copy_le32(header->compressed_size, compressed_size);
177 copy_le32(header->size, size);
178 }
179
180 static int has_only_ascii(const char *s)
181 {
182 for (;;) {
183 int c = *s++;
184 if (c == '\0')
185 return 1;
186 if (!isascii(c))
187 return 0;
188 }
189 }
190
191 #define STREAM_BUFFER_SIZE (1024 * 16)
192
193 static int write_zip_entry(struct archiver_args *args,
194 const unsigned char *sha1,
195 const char *path, size_t pathlen,
196 unsigned int mode)
197 {
198 struct zip_local_header header;
199 struct zip_dir_header dirent;
200 struct zip_extra_mtime extra;
201 unsigned long attr2;
202 unsigned long compressed_size;
203 unsigned long crc;
204 unsigned long direntsize;
205 int method;
206 unsigned char *out;
207 void *deflated = NULL;
208 void *buffer;
209 struct git_istream *stream = NULL;
210 unsigned long flags = 0;
211 unsigned long size;
212
213 crc = crc32(0, NULL, 0);
214
215 if (!has_only_ascii(path)) {
216 if (is_utf8(path))
217 flags |= ZIP_UTF8;
218 else
219 warning("Path is not valid UTF-8: %s", path);
220 }
221
222 if (pathlen > 0xffff) {
223 return error("path too long (%d chars, SHA1: %s): %s",
224 (int)pathlen, sha1_to_hex(sha1), path);
225 }
226
227 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
228 method = 0;
229 attr2 = 16;
230 out = NULL;
231 size = 0;
232 compressed_size = 0;
233 buffer = NULL;
234 } else if (S_ISREG(mode) || S_ISLNK(mode)) {
235 enum object_type type = sha1_object_info(sha1, &size);
236
237 method = 0;
238 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
239 (mode & 0111) ? ((mode) << 16) : 0;
240 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
241 method = 8;
242
243 if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
244 size > big_file_threshold) {
245 stream = open_istream(sha1, &type, &size, NULL);
246 if (!stream)
247 return error("cannot stream blob %s",
248 sha1_to_hex(sha1));
249 flags |= ZIP_STREAM;
250 out = buffer = NULL;
251 } else {
252 buffer = sha1_file_to_archive(args, path, sha1, mode,
253 &type, &size);
254 if (!buffer)
255 return error("cannot read %s",
256 sha1_to_hex(sha1));
257 crc = crc32(crc, buffer, size);
258 out = buffer;
259 }
260 compressed_size = (method == 0) ? size : 0;
261 } else {
262 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
263 sha1_to_hex(sha1));
264 }
265
266 if (buffer && method == 8) {
267 deflated = zlib_deflate(buffer, size, args->compression_level,
268 &compressed_size);
269 if (deflated && compressed_size - 6 < size) {
270 /* ZLIB --> raw compressed data (see RFC 1950) */
271 /* CMF and FLG ... */
272 out = (unsigned char *)deflated + 2;
273 compressed_size -= 6; /* ... and ADLER32 */
274 } else {
275 method = 0;
276 compressed_size = size;
277 }
278 }
279
280 copy_le16(extra.magic, 0x5455);
281 copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
282 extra.flags[0] = 1; /* just mtime */
283 copy_le32(extra.mtime, args->time);
284
285 /* make sure we have enough free space in the dictionary */
286 direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
287 while (zip_dir_size < zip_dir_offset + direntsize) {
288 zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
289 zip_dir = xrealloc(zip_dir, zip_dir_size);
290 }
291
292 copy_le32(dirent.magic, 0x02014b50);
293 copy_le16(dirent.creator_version,
294 S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
295 copy_le16(dirent.version, 10);
296 copy_le16(dirent.flags, flags);
297 copy_le16(dirent.compression_method, method);
298 copy_le16(dirent.mtime, zip_time);
299 copy_le16(dirent.mdate, zip_date);
300 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
301 copy_le16(dirent.filename_length, pathlen);
302 copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
303 copy_le16(dirent.comment_length, 0);
304 copy_le16(dirent.disk, 0);
305 copy_le16(dirent.attr1, 0);
306 copy_le32(dirent.attr2, attr2);
307 copy_le32(dirent.offset, zip_offset);
308
309 copy_le32(header.magic, 0x04034b50);
310 copy_le16(header.version, 10);
311 copy_le16(header.flags, flags);
312 copy_le16(header.compression_method, method);
313 copy_le16(header.mtime, zip_time);
314 copy_le16(header.mdate, zip_date);
315 set_zip_header_data_desc(&header, size, compressed_size, crc);
316 copy_le16(header.filename_length, pathlen);
317 copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
318 write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
319 zip_offset += ZIP_LOCAL_HEADER_SIZE;
320 write_or_die(1, path, pathlen);
321 zip_offset += pathlen;
322 write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
323 zip_offset += ZIP_EXTRA_MTIME_SIZE;
324 if (stream && method == 0) {
325 unsigned char buf[STREAM_BUFFER_SIZE];
326 ssize_t readlen;
327
328 for (;;) {
329 readlen = read_istream(stream, buf, sizeof(buf));
330 if (readlen <= 0)
331 break;
332 crc = crc32(crc, buf, readlen);
333 write_or_die(1, buf, readlen);
334 }
335 close_istream(stream);
336 if (readlen)
337 return readlen;
338
339 compressed_size = size;
340 zip_offset += compressed_size;
341
342 write_zip_data_desc(size, compressed_size, crc);
343 zip_offset += ZIP_DATA_DESC_SIZE;
344
345 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
346 } else if (stream && method == 8) {
347 unsigned char buf[STREAM_BUFFER_SIZE];
348 ssize_t readlen;
349 git_zstream zstream;
350 int result;
351 size_t out_len;
352 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
353
354 memset(&zstream, 0, sizeof(zstream));
355 git_deflate_init(&zstream, args->compression_level);
356
357 compressed_size = 0;
358 zstream.next_out = compressed;
359 zstream.avail_out = sizeof(compressed);
360
361 for (;;) {
362 readlen = read_istream(stream, buf, sizeof(buf));
363 if (readlen <= 0)
364 break;
365 crc = crc32(crc, buf, readlen);
366
367 zstream.next_in = buf;
368 zstream.avail_in = readlen;
369 result = git_deflate(&zstream, 0);
370 if (result != Z_OK)
371 die("deflate error (%d)", result);
372 out = compressed;
373 if (!compressed_size)
374 out += 2;
375 out_len = zstream.next_out - out;
376
377 if (out_len > 0) {
378 write_or_die(1, out, out_len);
379 compressed_size += out_len;
380 zstream.next_out = compressed;
381 zstream.avail_out = sizeof(compressed);
382 }
383
384 }
385 close_istream(stream);
386 if (readlen)
387 return readlen;
388
389 zstream.next_in = buf;
390 zstream.avail_in = 0;
391 result = git_deflate(&zstream, Z_FINISH);
392 if (result != Z_STREAM_END)
393 die("deflate error (%d)", result);
394
395 git_deflate_end(&zstream);
396 out = compressed;
397 if (!compressed_size)
398 out += 2;
399 out_len = zstream.next_out - out - 4;
400 write_or_die(1, out, out_len);
401 compressed_size += out_len;
402 zip_offset += compressed_size;
403
404 write_zip_data_desc(size, compressed_size, crc);
405 zip_offset += ZIP_DATA_DESC_SIZE;
406
407 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
408 } else if (compressed_size > 0) {
409 write_or_die(1, out, compressed_size);
410 zip_offset += compressed_size;
411 }
412
413 free(deflated);
414 free(buffer);
415
416 memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
417 zip_dir_offset += ZIP_DIR_HEADER_SIZE;
418 memcpy(zip_dir + zip_dir_offset, path, pathlen);
419 zip_dir_offset += pathlen;
420 memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
421 zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
422 zip_dir_entries++;
423
424 return 0;
425 }
426
427 static void write_zip_trailer(const unsigned char *sha1)
428 {
429 struct zip_dir_trailer trailer;
430
431 copy_le32(trailer.magic, 0x06054b50);
432 copy_le16(trailer.disk, 0);
433 copy_le16(trailer.directory_start_disk, 0);
434 copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
435 copy_le16(trailer.entries, zip_dir_entries);
436 copy_le32(trailer.size, zip_dir_offset);
437 copy_le32(trailer.offset, zip_offset);
438 copy_le16(trailer.comment_length, sha1 ? 40 : 0);
439
440 write_or_die(1, zip_dir, zip_dir_offset);
441 write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
442 if (sha1)
443 write_or_die(1, sha1_to_hex(sha1), 40);
444 }
445
446 static void dos_time(time_t *time, int *dos_date, int *dos_time)
447 {
448 struct tm *t = localtime(time);
449
450 *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
451 (t->tm_year + 1900 - 1980) * 512;
452 *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
453 }
454
455 static int write_zip_archive(const struct archiver *ar,
456 struct archiver_args *args)
457 {
458 int err;
459
460 dos_time(&args->time, &zip_date, &zip_time);
461
462 zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
463 zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
464
465 err = write_archive_entries(args, write_zip_entry);
466 if (!err)
467 write_zip_trailer(args->commit_sha1);
468
469 free(zip_dir);
470
471 return err;
472 }
473
474 static struct archiver zip_archiver = {
475 "zip",
476 write_zip_archive,
477 ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
478 };
479
480 void init_zip_archiver(void)
481 {
482 register_archiver(&zip_archiver);
483 }