Merge branch 'nd/dwim-wildcards-as-pathspecs' into maint
[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 #include "userdiff.h"
9 #include "xdiff-interface.h"
10
11 static int zip_date;
12 static int zip_time;
13
14 static unsigned char *zip_dir;
15 static unsigned int zip_dir_size;
16
17 static unsigned int zip_offset;
18 static unsigned int zip_dir_offset;
19 static unsigned int zip_dir_entries;
20
21 #define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
22 #define ZIP_STREAM      (1 <<  3)
23 #define ZIP_UTF8        (1 << 11)
24
25 struct zip_local_header {
26         unsigned char magic[4];
27         unsigned char version[2];
28         unsigned char flags[2];
29         unsigned char compression_method[2];
30         unsigned char mtime[2];
31         unsigned char mdate[2];
32         unsigned char crc32[4];
33         unsigned char compressed_size[4];
34         unsigned char size[4];
35         unsigned char filename_length[2];
36         unsigned char extra_length[2];
37         unsigned char _end[1];
38 };
39
40 struct zip_data_desc {
41         unsigned char magic[4];
42         unsigned char crc32[4];
43         unsigned char compressed_size[4];
44         unsigned char size[4];
45         unsigned char _end[1];
46 };
47
48 struct zip_dir_header {
49         unsigned char magic[4];
50         unsigned char creator_version[2];
51         unsigned char version[2];
52         unsigned char flags[2];
53         unsigned char compression_method[2];
54         unsigned char mtime[2];
55         unsigned char mdate[2];
56         unsigned char crc32[4];
57         unsigned char compressed_size[4];
58         unsigned char size[4];
59         unsigned char filename_length[2];
60         unsigned char extra_length[2];
61         unsigned char comment_length[2];
62         unsigned char disk[2];
63         unsigned char attr1[2];
64         unsigned char attr2[4];
65         unsigned char offset[4];
66         unsigned char _end[1];
67 };
68
69 struct zip_dir_trailer {
70         unsigned char magic[4];
71         unsigned char disk[2];
72         unsigned char directory_start_disk[2];
73         unsigned char entries_on_this_disk[2];
74         unsigned char entries[2];
75         unsigned char size[4];
76         unsigned char offset[4];
77         unsigned char comment_length[2];
78         unsigned char _end[1];
79 };
80
81 struct zip_extra_mtime {
82         unsigned char magic[2];
83         unsigned char extra_size[2];
84         unsigned char flags[1];
85         unsigned char mtime[4];
86         unsigned char _end[1];
87 };
88
89 /*
90  * On ARM, padding is added at the end of the struct, so a simple
91  * sizeof(struct ...) reports two bytes more than the payload size
92  * we're interested in.
93  */
94 #define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
95 #define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
96 #define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
97 #define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
98 #define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
99 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
100         (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
101
102 static void copy_le16(unsigned char *dest, unsigned int n)
103 {
104         dest[0] = 0xff & n;
105         dest[1] = 0xff & (n >> 010);
106 }
107
108 static void copy_le32(unsigned char *dest, unsigned int n)
109 {
110         dest[0] = 0xff & n;
111         dest[1] = 0xff & (n >> 010);
112         dest[2] = 0xff & (n >> 020);
113         dest[3] = 0xff & (n >> 030);
114 }
115
116 static void *zlib_deflate_raw(void *data, unsigned long size,
117                               int compression_level,
118                               unsigned long *compressed_size)
119 {
120         git_zstream stream;
121         unsigned long maxsize;
122         void *buffer;
123         int result;
124
125         git_deflate_init_raw(&stream, compression_level);
126         maxsize = git_deflate_bound(&stream, size);
127         buffer = xmalloc(maxsize);
128
129         stream.next_in = data;
130         stream.avail_in = size;
131         stream.next_out = buffer;
132         stream.avail_out = maxsize;
133
134         do {
135                 result = git_deflate(&stream, Z_FINISH);
136         } while (result == Z_OK);
137
138         if (result != Z_STREAM_END) {
139                 free(buffer);
140                 return NULL;
141         }
142
143         git_deflate_end(&stream);
144         *compressed_size = stream.total_out;
145
146         return buffer;
147 }
148
149 static void write_zip_data_desc(unsigned long size,
150                                 unsigned long compressed_size,
151                                 unsigned long crc)
152 {
153         struct zip_data_desc trailer;
154
155         copy_le32(trailer.magic, 0x08074b50);
156         copy_le32(trailer.crc32, crc);
157         copy_le32(trailer.compressed_size, compressed_size);
158         copy_le32(trailer.size, size);
159         write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
160 }
161
162 static void set_zip_dir_data_desc(struct zip_dir_header *header,
163                                   unsigned long size,
164                                   unsigned long compressed_size,
165                                   unsigned long crc)
166 {
167         copy_le32(header->crc32, crc);
168         copy_le32(header->compressed_size, compressed_size);
169         copy_le32(header->size, size);
170 }
171
172 static void set_zip_header_data_desc(struct zip_local_header *header,
173                                      unsigned long size,
174                                      unsigned long compressed_size,
175                                      unsigned long crc)
176 {
177         copy_le32(header->crc32, crc);
178         copy_le32(header->compressed_size, compressed_size);
179         copy_le32(header->size, size);
180 }
181
182 static int has_only_ascii(const char *s)
183 {
184         for (;;) {
185                 int c = *s++;
186                 if (c == '\0')
187                         return 1;
188                 if (!isascii(c))
189                         return 0;
190         }
191 }
192
193 static int entry_is_binary(const char *path, const void *buffer, size_t size)
194 {
195         struct userdiff_driver *driver = userdiff_find_by_path(path);
196         if (!driver)
197                 driver = userdiff_find_by_name("default");
198         if (driver->binary != -1)
199                 return driver->binary;
200         return buffer_is_binary(buffer, size);
201 }
202
203 #define STREAM_BUFFER_SIZE (1024 * 16)
204
205 static int write_zip_entry(struct archiver_args *args,
206                            const unsigned char *sha1,
207                            const char *path, size_t pathlen,
208                            unsigned int mode)
209 {
210         struct zip_local_header header;
211         struct zip_dir_header dirent;
212         struct zip_extra_mtime extra;
213         unsigned long attr2;
214         unsigned long compressed_size;
215         unsigned long crc;
216         unsigned long direntsize;
217         int method;
218         unsigned char *out;
219         void *deflated = NULL;
220         void *buffer;
221         struct git_istream *stream = NULL;
222         unsigned long flags = 0;
223         unsigned long size;
224         int is_binary = -1;
225         const char *path_without_prefix = path + args->baselen;
226
227         crc = crc32(0, NULL, 0);
228
229         if (!has_only_ascii(path)) {
230                 if (is_utf8(path))
231                         flags |= ZIP_UTF8;
232                 else
233                         warning("Path is not valid UTF-8: %s", path);
234         }
235
236         if (pathlen > 0xffff) {
237                 return error("path too long (%d chars, SHA1: %s): %s",
238                                 (int)pathlen, sha1_to_hex(sha1), path);
239         }
240
241         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
242                 method = 0;
243                 attr2 = 16;
244                 out = NULL;
245                 size = 0;
246                 compressed_size = 0;
247                 buffer = NULL;
248         } else if (S_ISREG(mode) || S_ISLNK(mode)) {
249                 enum object_type type = sha1_object_info(sha1, &size);
250
251                 method = 0;
252                 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
253                         (mode & 0111) ? ((mode) << 16) : 0;
254                 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
255                         method = 8;
256
257                 if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
258                     size > big_file_threshold) {
259                         stream = open_istream(sha1, &type, &size, NULL);
260                         if (!stream)
261                                 return error("cannot stream blob %s",
262                                              sha1_to_hex(sha1));
263                         flags |= ZIP_STREAM;
264                         out = buffer = NULL;
265                 } else {
266                         buffer = sha1_file_to_archive(args, path, sha1, mode,
267                                                       &type, &size);
268                         if (!buffer)
269                                 return error("cannot read %s",
270                                              sha1_to_hex(sha1));
271                         crc = crc32(crc, buffer, size);
272                         is_binary = entry_is_binary(path_without_prefix,
273                                                     buffer, size);
274                         out = buffer;
275                 }
276                 compressed_size = (method == 0) ? size : 0;
277         } else {
278                 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
279                                 sha1_to_hex(sha1));
280         }
281
282         if (buffer && method == 8) {
283                 out = deflated = zlib_deflate_raw(buffer, size,
284                                                   args->compression_level,
285                                                   &compressed_size);
286                 if (!out || compressed_size >= size) {
287                         out = buffer;
288                         method = 0;
289                         compressed_size = size;
290                 }
291         }
292
293         copy_le16(extra.magic, 0x5455);
294         copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
295         extra.flags[0] = 1;     /* just mtime */
296         copy_le32(extra.mtime, args->time);
297
298         /* make sure we have enough free space in the dictionary */
299         direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
300         while (zip_dir_size < zip_dir_offset + direntsize) {
301                 zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
302                 zip_dir = xrealloc(zip_dir, zip_dir_size);
303         }
304
305         copy_le32(dirent.magic, 0x02014b50);
306         copy_le16(dirent.creator_version,
307                 S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
308         copy_le16(dirent.version, 10);
309         copy_le16(dirent.flags, flags);
310         copy_le16(dirent.compression_method, method);
311         copy_le16(dirent.mtime, zip_time);
312         copy_le16(dirent.mdate, zip_date);
313         set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
314         copy_le16(dirent.filename_length, pathlen);
315         copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
316         copy_le16(dirent.comment_length, 0);
317         copy_le16(dirent.disk, 0);
318         copy_le32(dirent.attr2, attr2);
319         copy_le32(dirent.offset, zip_offset);
320
321         copy_le32(header.magic, 0x04034b50);
322         copy_le16(header.version, 10);
323         copy_le16(header.flags, flags);
324         copy_le16(header.compression_method, method);
325         copy_le16(header.mtime, zip_time);
326         copy_le16(header.mdate, zip_date);
327         set_zip_header_data_desc(&header, size, compressed_size, crc);
328         copy_le16(header.filename_length, pathlen);
329         copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
330         write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
331         zip_offset += ZIP_LOCAL_HEADER_SIZE;
332         write_or_die(1, path, pathlen);
333         zip_offset += pathlen;
334         write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
335         zip_offset += ZIP_EXTRA_MTIME_SIZE;
336         if (stream && method == 0) {
337                 unsigned char buf[STREAM_BUFFER_SIZE];
338                 ssize_t readlen;
339
340                 for (;;) {
341                         readlen = read_istream(stream, buf, sizeof(buf));
342                         if (readlen <= 0)
343                                 break;
344                         crc = crc32(crc, buf, readlen);
345                         if (is_binary == -1)
346                                 is_binary = entry_is_binary(path_without_prefix,
347                                                             buf, readlen);
348                         write_or_die(1, buf, readlen);
349                 }
350                 close_istream(stream);
351                 if (readlen)
352                         return readlen;
353
354                 compressed_size = size;
355                 zip_offset += compressed_size;
356
357                 write_zip_data_desc(size, compressed_size, crc);
358                 zip_offset += ZIP_DATA_DESC_SIZE;
359
360                 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
361         } else if (stream && method == 8) {
362                 unsigned char buf[STREAM_BUFFER_SIZE];
363                 ssize_t readlen;
364                 git_zstream zstream;
365                 int result;
366                 size_t out_len;
367                 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
368
369                 git_deflate_init_raw(&zstream, args->compression_level);
370
371                 compressed_size = 0;
372                 zstream.next_out = compressed;
373                 zstream.avail_out = sizeof(compressed);
374
375                 for (;;) {
376                         readlen = read_istream(stream, buf, sizeof(buf));
377                         if (readlen <= 0)
378                                 break;
379                         crc = crc32(crc, buf, readlen);
380                         if (is_binary == -1)
381                                 is_binary = entry_is_binary(path_without_prefix,
382                                                             buf, readlen);
383
384                         zstream.next_in = buf;
385                         zstream.avail_in = readlen;
386                         result = git_deflate(&zstream, 0);
387                         if (result != Z_OK)
388                                 die("deflate error (%d)", result);
389                         out_len = zstream.next_out - compressed;
390
391                         if (out_len > 0) {
392                                 write_or_die(1, compressed, out_len);
393                                 compressed_size += out_len;
394                                 zstream.next_out = compressed;
395                                 zstream.avail_out = sizeof(compressed);
396                         }
397
398                 }
399                 close_istream(stream);
400                 if (readlen)
401                         return readlen;
402
403                 zstream.next_in = buf;
404                 zstream.avail_in = 0;
405                 result = git_deflate(&zstream, Z_FINISH);
406                 if (result != Z_STREAM_END)
407                         die("deflate error (%d)", result);
408
409                 git_deflate_end(&zstream);
410                 out_len = zstream.next_out - compressed;
411                 write_or_die(1, compressed, out_len);
412                 compressed_size += out_len;
413                 zip_offset += compressed_size;
414
415                 write_zip_data_desc(size, compressed_size, crc);
416                 zip_offset += ZIP_DATA_DESC_SIZE;
417
418                 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
419         } else if (compressed_size > 0) {
420                 write_or_die(1, out, compressed_size);
421                 zip_offset += compressed_size;
422         }
423
424         free(deflated);
425         free(buffer);
426
427         copy_le16(dirent.attr1, !is_binary);
428
429         memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
430         zip_dir_offset += ZIP_DIR_HEADER_SIZE;
431         memcpy(zip_dir + zip_dir_offset, path, pathlen);
432         zip_dir_offset += pathlen;
433         memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
434         zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
435         zip_dir_entries++;
436
437         return 0;
438 }
439
440 static void write_zip_trailer(const unsigned char *sha1)
441 {
442         struct zip_dir_trailer trailer;
443
444         copy_le32(trailer.magic, 0x06054b50);
445         copy_le16(trailer.disk, 0);
446         copy_le16(trailer.directory_start_disk, 0);
447         copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
448         copy_le16(trailer.entries, zip_dir_entries);
449         copy_le32(trailer.size, zip_dir_offset);
450         copy_le32(trailer.offset, zip_offset);
451         copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
452
453         write_or_die(1, zip_dir, zip_dir_offset);
454         write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
455         if (sha1)
456                 write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
457 }
458
459 static void dos_time(time_t *time, int *dos_date, int *dos_time)
460 {
461         struct tm *t = localtime(time);
462
463         *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
464                     (t->tm_year + 1900 - 1980) * 512;
465         *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
466 }
467
468 static int write_zip_archive(const struct archiver *ar,
469                              struct archiver_args *args)
470 {
471         int err;
472
473         dos_time(&args->time, &zip_date, &zip_time);
474
475         zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
476         zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
477
478         err = write_archive_entries(args, write_zip_entry);
479         if (!err)
480                 write_zip_trailer(args->commit_sha1);
481
482         free(zip_dir);
483
484         return err;
485 }
486
487 static struct archiver zip_archiver = {
488         "zip",
489         write_zip_archive,
490         ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
491 };
492
493 void init_zip_archiver(void)
494 {
495         register_archiver(&zip_archiver);
496 }