Start preparing for 1.8.4.2
[alt-git.git] / archive-zip.c
blob4bde019bce632703d4e336d6404693487cdbcdfb
1 /*
2 * Copyright (c) 2006 Rene Scharfe
3 */
4 #include "cache.h"
5 #include "archive.h"
6 #include "streaming.h"
7 #include "utf8.h"
9 static int zip_date;
10 static int zip_time;
12 static unsigned char *zip_dir;
13 static unsigned int zip_dir_size;
15 static unsigned int zip_offset;
16 static unsigned int zip_dir_offset;
17 static unsigned int zip_dir_entries;
19 #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
20 #define ZIP_STREAM (1 << 3)
21 #define ZIP_UTF8 (1 << 11)
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];
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];
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];
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];
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];
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.
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))
100 static void copy_le16(unsigned char *dest, unsigned int n)
102 dest[0] = 0xff & n;
103 dest[1] = 0xff & (n >> 010);
106 static void copy_le32(unsigned char *dest, unsigned int n)
108 dest[0] = 0xff & n;
109 dest[1] = 0xff & (n >> 010);
110 dest[2] = 0xff & (n >> 020);
111 dest[3] = 0xff & (n >> 030);
114 static void *zlib_deflate_raw(void *data, unsigned long size,
115 int compression_level,
116 unsigned long *compressed_size)
118 git_zstream stream;
119 unsigned long maxsize;
120 void *buffer;
121 int result;
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);
128 stream.next_in = data;
129 stream.avail_in = size;
130 stream.next_out = buffer;
131 stream.avail_out = maxsize;
133 do {
134 result = git_deflate(&stream, Z_FINISH);
135 } while (result == Z_OK);
137 if (result != Z_STREAM_END) {
138 free(buffer);
139 return NULL;
142 git_deflate_end(&stream);
143 *compressed_size = stream.total_out;
145 return buffer;
148 static void write_zip_data_desc(unsigned long size,
149 unsigned long compressed_size,
150 unsigned long crc)
152 struct zip_data_desc trailer;
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);
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)
166 copy_le32(header->crc32, crc);
167 copy_le32(header->compressed_size, compressed_size);
168 copy_le32(header->size, size);
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)
176 copy_le32(header->crc32, crc);
177 copy_le32(header->compressed_size, compressed_size);
178 copy_le32(header->size, size);
181 static int has_only_ascii(const char *s)
183 for (;;) {
184 int c = *s++;
185 if (c == '\0')
186 return 1;
187 if (!isascii(c))
188 return 0;
192 #define STREAM_BUFFER_SIZE (1024 * 16)
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)
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;
214 crc = crc32(0, NULL, 0);
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);
223 if (pathlen > 0xffff) {
224 return error("path too long (%d chars, SHA1: %s): %s",
225 (int)pathlen, sha1_to_hex(sha1), path);
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);
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;
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;
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));
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;
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);
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);
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);
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;
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);
333 close_istream(stream);
334 if (readlen)
335 return readlen;
337 compressed_size = size;
338 zip_offset += compressed_size;
340 write_zip_data_desc(size, compressed_size, crc);
341 zip_offset += ZIP_DATA_DESC_SIZE;
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];
352 memset(&zstream, 0, sizeof(zstream));
353 git_deflate_init_raw(&zstream, args->compression_level);
355 compressed_size = 0;
356 zstream.next_out = compressed;
357 zstream.avail_out = sizeof(compressed);
359 for (;;) {
360 readlen = read_istream(stream, buf, sizeof(buf));
361 if (readlen <= 0)
362 break;
363 crc = crc32(crc, buf, readlen);
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;
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);
380 close_istream(stream);
381 if (readlen)
382 return readlen;
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);
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;
396 write_zip_data_desc(size, compressed_size, crc);
397 zip_offset += ZIP_DATA_DESC_SIZE;
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;
405 free(deflated);
406 free(buffer);
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++;
416 return 0;
419 static void write_zip_trailer(const unsigned char *sha1)
421 struct zip_dir_trailer trailer;
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);
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);
438 static void dos_time(time_t *time, int *dos_date, int *dos_time)
440 struct tm *t = localtime(time);
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;
447 static int write_zip_archive(const struct archiver *ar,
448 struct archiver_args *args)
450 int err;
452 dos_time(&args->time, &zip_date, &zip_time);
454 zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
455 zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
457 err = write_archive_entries(args, write_zip_entry);
458 if (!err)
459 write_zip_trailer(args->commit_sha1);
461 free(zip_dir);
463 return err;
466 static struct archiver zip_archiver = {
467 "zip",
468 write_zip_archive,
469 ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
472 void init_zip_archiver(void)
474 register_archiver(&zip_archiver);