2 * Copyright (c) 2006 Rene Scharfe
10 static unsigned char *zip_dir;
11 static unsigned int zip_dir_size;
13 static unsigned int zip_offset;
14 static unsigned int zip_dir_offset;
15 static unsigned int zip_dir_entries;
17 #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
19 struct zip_local_header {
20 unsigned char magic[4];
21 unsigned char version[2];
22 unsigned char flags[2];
23 unsigned char compression_method[2];
24 unsigned char mtime[2];
25 unsigned char mdate[2];
26 unsigned char crc32[4];
27 unsigned char compressed_size[4];
28 unsigned char size[4];
29 unsigned char filename_length[2];
30 unsigned char extra_length[2];
31 unsigned char _end[1];
34 struct zip_dir_header {
35 unsigned char magic[4];
36 unsigned char creator_version[2];
37 unsigned char version[2];
38 unsigned char flags[2];
39 unsigned char compression_method[2];
40 unsigned char mtime[2];
41 unsigned char mdate[2];
42 unsigned char crc32[4];
43 unsigned char compressed_size[4];
44 unsigned char size[4];
45 unsigned char filename_length[2];
46 unsigned char extra_length[2];
47 unsigned char comment_length[2];
48 unsigned char disk[2];
49 unsigned char attr1[2];
50 unsigned char attr2[4];
51 unsigned char offset[4];
52 unsigned char _end[1];
55 struct zip_dir_trailer {
56 unsigned char magic[4];
57 unsigned char disk[2];
58 unsigned char directory_start_disk[2];
59 unsigned char entries_on_this_disk[2];
60 unsigned char entries[2];
61 unsigned char size[4];
62 unsigned char offset[4];
63 unsigned char comment_length[2];
64 unsigned char _end[1];
68 * On ARM, padding is added at the end of the struct, so a simple
69 * sizeof(struct ...) reports two bytes more than the payload size
70 * we're interested in.
72 #define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
73 #define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
74 #define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
76 static void copy_le16(unsigned char *dest, unsigned int n)
79 dest[1] = 0xff & (n >> 010);
82 static void copy_le32(unsigned char *dest, unsigned int n)
85 dest[1] = 0xff & (n >> 010);
86 dest[2] = 0xff & (n >> 020);
87 dest[3] = 0xff & (n >> 030);
90 static void *zlib_deflate(void *data, unsigned long size,
91 int compression_level, unsigned long *compressed_size)
94 unsigned long maxsize;
98 memset(&stream, 0, sizeof(stream));
99 git_deflate_init(&stream, compression_level);
100 maxsize = git_deflate_bound(&stream, size);
101 buffer = xmalloc(maxsize);
103 stream.next_in = data;
104 stream.avail_in = size;
105 stream.next_out = buffer;
106 stream.avail_out = maxsize;
109 result = git_deflate(&stream, Z_FINISH);
110 } while (result == Z_OK);
112 if (result != Z_STREAM_END) {
117 git_deflate_end(&stream);
118 *compressed_size = stream.total_out;
123 static int write_zip_entry(struct archiver_args *args,
124 const unsigned char *sha1,
125 const char *path, size_t pathlen,
128 struct zip_local_header header;
129 struct zip_dir_header dirent;
131 unsigned long compressed_size;
133 unsigned long direntsize;
136 void *deflated = NULL;
140 crc = crc32(0, NULL, 0);
142 if (pathlen > 0xffff) {
143 return error("path too long (%d chars, SHA1: %s): %s",
144 (int)pathlen, sha1_to_hex(sha1), path);
147 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
155 } else if (S_ISREG(mode) || S_ISLNK(mode)) {
156 enum object_type type;
157 buffer = sha1_file_to_archive(args, path, sha1, mode, &type, &size);
159 return error("cannot read %s", sha1_to_hex(sha1));
162 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
163 (mode & 0111) ? ((mode) << 16) : 0;
164 if (S_ISREG(mode) && args->compression_level != 0)
166 crc = crc32(crc, buffer, size);
168 compressed_size = size;
170 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
175 deflated = zlib_deflate(buffer, size, args->compression_level,
177 if (deflated && compressed_size - 6 < size) {
178 /* ZLIB --> raw compressed data (see RFC 1950) */
179 /* CMF and FLG ... */
180 out = (unsigned char *)deflated + 2;
181 compressed_size -= 6; /* ... and ADLER32 */
184 compressed_size = size;
188 /* make sure we have enough free space in the dictionary */
189 direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
190 while (zip_dir_size < zip_dir_offset + direntsize) {
191 zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
192 zip_dir = xrealloc(zip_dir, zip_dir_size);
195 copy_le32(dirent.magic, 0x02014b50);
196 copy_le16(dirent.creator_version,
197 S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
198 copy_le16(dirent.version, 10);
199 copy_le16(dirent.flags, 0);
200 copy_le16(dirent.compression_method, method);
201 copy_le16(dirent.mtime, zip_time);
202 copy_le16(dirent.mdate, zip_date);
203 copy_le32(dirent.crc32, crc);
204 copy_le32(dirent.compressed_size, compressed_size);
205 copy_le32(dirent.size, size);
206 copy_le16(dirent.filename_length, pathlen);
207 copy_le16(dirent.extra_length, 0);
208 copy_le16(dirent.comment_length, 0);
209 copy_le16(dirent.disk, 0);
210 copy_le16(dirent.attr1, 0);
211 copy_le32(dirent.attr2, attr2);
212 copy_le32(dirent.offset, zip_offset);
213 memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
214 zip_dir_offset += ZIP_DIR_HEADER_SIZE;
215 memcpy(zip_dir + zip_dir_offset, path, pathlen);
216 zip_dir_offset += pathlen;
219 copy_le32(header.magic, 0x04034b50);
220 copy_le16(header.version, 10);
221 copy_le16(header.flags, 0);
222 copy_le16(header.compression_method, method);
223 copy_le16(header.mtime, zip_time);
224 copy_le16(header.mdate, zip_date);
225 copy_le32(header.crc32, crc);
226 copy_le32(header.compressed_size, compressed_size);
227 copy_le32(header.size, size);
228 copy_le16(header.filename_length, pathlen);
229 copy_le16(header.extra_length, 0);
230 write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
231 zip_offset += ZIP_LOCAL_HEADER_SIZE;
232 write_or_die(1, path, pathlen);
233 zip_offset += pathlen;
234 if (compressed_size > 0) {
235 write_or_die(1, out, compressed_size);
236 zip_offset += compressed_size;
245 static void write_zip_trailer(const unsigned char *sha1)
247 struct zip_dir_trailer trailer;
249 copy_le32(trailer.magic, 0x06054b50);
250 copy_le16(trailer.disk, 0);
251 copy_le16(trailer.directory_start_disk, 0);
252 copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
253 copy_le16(trailer.entries, zip_dir_entries);
254 copy_le32(trailer.size, zip_dir_offset);
255 copy_le32(trailer.offset, zip_offset);
256 copy_le16(trailer.comment_length, sha1 ? 40 : 0);
258 write_or_die(1, zip_dir, zip_dir_offset);
259 write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
261 write_or_die(1, sha1_to_hex(sha1), 40);
264 static void dos_time(time_t *time, int *dos_date, int *dos_time)
266 struct tm *t = localtime(time);
268 *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
269 (t->tm_year + 1900 - 1980) * 512;
270 *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
273 static int write_zip_archive(const struct archiver *ar,
274 struct archiver_args *args)
278 dos_time(&args->time, &zip_date, &zip_time);
280 zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
281 zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
283 err = write_archive_entries(args, write_zip_entry);
285 write_zip_trailer(args->commit_sha1);
292 static struct archiver zip_archiver = {
295 ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
298 void init_zip_archiver(void)
300 register_archiver(&zip_archiver);