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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_raw(void *data, unsigned long size, | |
115 | int compression_level, | |
116 | unsigned long *compressed_size) | |
117 | { | |
118 | git_zstream stream; | |
119 | unsigned long maxsize; | |
120 | void *buffer; | |
121 | int result; | |
122 | ||
123 | memset(&stream, 0, sizeof(stream)); | |
124 | git_deflate_init_raw(&stream, compression_level); | |
125 | maxsize = git_deflate_bound(&stream, size); | |
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 { | |
134 | result = git_deflate(&stream, Z_FINISH); | |
135 | } while (result == Z_OK); | |
136 | ||
137 | if (result != Z_STREAM_END) { | |
138 | free(buffer); | |
139 | return NULL; | |
140 | } | |
141 | ||
142 | git_deflate_end(&stream); | |
143 | *compressed_size = stream.total_out; | |
144 | ||
145 | return buffer; | |
146 | } | |
147 | ||
148 | static 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 | ||
161 | static 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 | ||
171 | static 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 | ||
181 | static 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 | ||
192 | #define STREAM_BUFFER_SIZE (1024 * 16) | |
193 | ||
194 | static int write_zip_entry(struct archiver_args *args, | |
195 | const unsigned char *sha1, | |
196 | const char *path, size_t pathlen, | |
197 | unsigned int mode) | |
198 | { | |
199 | struct zip_local_header header; | |
200 | struct zip_dir_header dirent; | |
201 | struct zip_extra_mtime extra; | |
202 | unsigned long attr2; | |
203 | unsigned long compressed_size; | |
204 | unsigned long crc; | |
205 | unsigned long direntsize; | |
206 | int method; | |
207 | unsigned char *out; | |
208 | void *deflated = NULL; | |
209 | void *buffer; | |
210 | struct git_istream *stream = NULL; | |
211 | unsigned long flags = 0; | |
212 | unsigned long size; | |
213 | ||
214 | crc = crc32(0, NULL, 0); | |
215 | ||
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 | ||
223 | if (pathlen > 0xffff) { | |
224 | return error("path too long (%d chars, SHA1: %s): %s", | |
225 | (int)pathlen, sha1_to_hex(sha1), path); | |
226 | } | |
227 | ||
228 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { | |
229 | method = 0; | |
230 | attr2 = 16; | |
231 | out = NULL; | |
232 | size = 0; | |
233 | compressed_size = 0; | |
234 | buffer = NULL; | |
235 | } else if (S_ISREG(mode) || S_ISLNK(mode)) { | |
236 | enum object_type type = sha1_object_info(sha1, &size); | |
237 | ||
238 | method = 0; | |
239 | attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : | |
240 | (mode & 0111) ? ((mode) << 16) : 0; | |
241 | if (S_ISREG(mode) && args->compression_level != 0 && size > 0) | |
242 | method = 8; | |
243 | ||
244 | if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert && | |
245 | size > big_file_threshold) { | |
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 | } | |
261 | compressed_size = (method == 0) ? size : 0; | |
262 | } else { | |
263 | return error("unsupported file mode: 0%o (SHA1: %s)", mode, | |
264 | sha1_to_hex(sha1)); | |
265 | } | |
266 | ||
267 | if (buffer && method == 8) { | |
268 | out = deflated = zlib_deflate_raw(buffer, size, | |
269 | args->compression_level, | |
270 | &compressed_size); | |
271 | if (!out || compressed_size >= size) { | |
272 | out = buffer; | |
273 | method = 0; | |
274 | compressed_size = size; | |
275 | } | |
276 | } | |
277 | ||
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 | ||
283 | /* make sure we have enough free space in the dictionary */ | |
284 | direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE; | |
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); | |
291 | copy_le16(dirent.creator_version, | |
292 | S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0); | |
293 | copy_le16(dirent.version, 10); | |
294 | copy_le16(dirent.flags, flags); | |
295 | copy_le16(dirent.compression_method, method); | |
296 | copy_le16(dirent.mtime, zip_time); | |
297 | copy_le16(dirent.mdate, zip_date); | |
298 | set_zip_dir_data_desc(&dirent, size, compressed_size, crc); | |
299 | copy_le16(dirent.filename_length, pathlen); | |
300 | copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE); | |
301 | copy_le16(dirent.comment_length, 0); | |
302 | copy_le16(dirent.disk, 0); | |
303 | copy_le16(dirent.attr1, 0); | |
304 | copy_le32(dirent.attr2, attr2); | |
305 | copy_le32(dirent.offset, zip_offset); | |
306 | ||
307 | copy_le32(header.magic, 0x04034b50); | |
308 | copy_le16(header.version, 10); | |
309 | copy_le16(header.flags, flags); | |
310 | copy_le16(header.compression_method, method); | |
311 | copy_le16(header.mtime, zip_time); | |
312 | copy_le16(header.mdate, zip_date); | |
313 | set_zip_header_data_desc(&header, size, compressed_size, crc); | |
314 | copy_le16(header.filename_length, pathlen); | |
315 | copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE); | |
316 | write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE); | |
317 | zip_offset += ZIP_LOCAL_HEADER_SIZE; | |
318 | write_or_die(1, path, pathlen); | |
319 | zip_offset += pathlen; | |
320 | write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE); | |
321 | zip_offset += ZIP_EXTRA_MTIME_SIZE; | |
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 | ||
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)); | |
353 | git_deflate_init_raw(&zstream, args->compression_level); | |
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); | |
370 | out_len = zstream.next_out - compressed; | |
371 | ||
372 | if (out_len > 0) { | |
373 | write_or_die(1, compressed, out_len); | |
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); | |
391 | out_len = zstream.next_out - compressed; | |
392 | write_or_die(1, compressed, out_len); | |
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 | ||
399 | set_zip_dir_data_desc(&dirent, size, compressed_size, crc); | |
400 | } else if (compressed_size > 0) { | |
401 | write_or_die(1, out, compressed_size); | |
402 | zip_offset += compressed_size; | |
403 | } | |
404 | ||
405 | free(deflated); | |
406 | free(buffer); | |
407 | ||
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; | |
412 | memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE); | |
413 | zip_dir_offset += ZIP_EXTRA_MTIME_SIZE; | |
414 | zip_dir_entries++; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static 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); | |
433 | write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE); | |
434 | if (sha1) | |
435 | write_or_die(1, sha1_to_hex(sha1), 40); | |
436 | } | |
437 | ||
438 | static 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 | ||
447 | static int write_zip_archive(const struct archiver *ar, | |
448 | struct archiver_args *args) | |
449 | { | |
450 | int err; | |
451 | ||
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; | |
456 | ||
457 | err = write_archive_entries(args, write_zip_entry); | |
458 | if (!err) | |
459 | write_zip_trailer(args->commit_sha1); | |
460 | ||
461 | free(zip_dir); | |
462 | ||
463 | return err; | |
464 | } | |
465 | ||
466 | static struct archiver zip_archiver = { | |
467 | "zip", | |
468 | write_zip_archive, | |
469 | ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE | |
470 | }; | |
471 | ||
472 | void init_zip_archiver(void) | |
473 | { | |
474 | register_archiver(&zip_archiver); | |
475 | } |