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Commit | Line | Data |
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e4fbbfe9 RS |
1 | /* |
2 | * Copyright (c) 2006 Rene Scharfe | |
3 | */ | |
e4fbbfe9 | 4 | #include "cache.h" |
ec06bff5 | 5 | #include "archive.h" |
e4fbbfe9 | 6 | |
e4fbbfe9 RS |
7 | static int zip_date; |
8 | static int zip_time; | |
9 | ||
10 | static unsigned char *zip_dir; | |
11 | static unsigned int zip_dir_size; | |
12 | ||
13 | static unsigned int zip_offset; | |
14 | static unsigned int zip_dir_offset; | |
15 | static unsigned int zip_dir_entries; | |
16 | ||
17 | #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024) | |
18 | ||
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]; | |
0ea865ce | 31 | unsigned char _end[1]; |
e4fbbfe9 RS |
32 | }; |
33 | ||
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]; | |
0ea865ce | 52 | unsigned char _end[1]; |
e4fbbfe9 RS |
53 | }; |
54 | ||
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]; | |
0ea865ce | 64 | unsigned char _end[1]; |
e4fbbfe9 RS |
65 | }; |
66 | ||
0ea865ce RS |
67 | /* |
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. | |
71 | */ | |
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) | |
75 | ||
e4fbbfe9 RS |
76 | static void copy_le16(unsigned char *dest, unsigned int n) |
77 | { | |
78 | dest[0] = 0xff & n; | |
79 | dest[1] = 0xff & (n >> 010); | |
80 | } | |
81 | ||
82 | static void copy_le32(unsigned char *dest, unsigned int n) | |
83 | { | |
84 | dest[0] = 0xff & n; | |
85 | dest[1] = 0xff & (n >> 010); | |
86 | dest[2] = 0xff & (n >> 020); | |
87 | dest[3] = 0xff & (n >> 030); | |
88 | } | |
89 | ||
90 | static void *zlib_deflate(void *data, unsigned long size, | |
3a176c6c | 91 | int compression_level, unsigned long *compressed_size) |
e4fbbfe9 | 92 | { |
ef49a7a0 | 93 | git_zstream stream; |
e4fbbfe9 RS |
94 | unsigned long maxsize; |
95 | void *buffer; | |
96 | int result; | |
97 | ||
98 | memset(&stream, 0, sizeof(stream)); | |
55bb5c91 | 99 | git_deflate_init(&stream, compression_level); |
225a6f10 | 100 | maxsize = git_deflate_bound(&stream, size); |
e4fbbfe9 RS |
101 | buffer = xmalloc(maxsize); |
102 | ||
103 | stream.next_in = data; | |
104 | stream.avail_in = size; | |
105 | stream.next_out = buffer; | |
106 | stream.avail_out = maxsize; | |
107 | ||
108 | do { | |
55bb5c91 | 109 | result = git_deflate(&stream, Z_FINISH); |
e4fbbfe9 RS |
110 | } while (result == Z_OK); |
111 | ||
112 | if (result != Z_STREAM_END) { | |
113 | free(buffer); | |
114 | return NULL; | |
115 | } | |
116 | ||
55bb5c91 | 117 | git_deflate_end(&stream); |
e4fbbfe9 RS |
118 | *compressed_size = stream.total_out; |
119 | ||
120 | return buffer; | |
121 | } | |
122 | ||
562e25ab RS |
123 | static int write_zip_entry(struct archiver_args *args, |
124 | const unsigned char *sha1, const char *path, size_t pathlen, | |
125 | unsigned int mode, void *buffer, unsigned long size) | |
e4fbbfe9 RS |
126 | { |
127 | struct zip_local_header header; | |
128 | struct zip_dir_header dirent; | |
62cdce17 | 129 | unsigned long attr2; |
e4fbbfe9 RS |
130 | unsigned long compressed_size; |
131 | unsigned long uncompressed_size; | |
132 | unsigned long crc; | |
133 | unsigned long direntsize; | |
e4fbbfe9 | 134 | int method; |
e4fbbfe9 | 135 | unsigned char *out; |
e4fbbfe9 RS |
136 | void *deflated = NULL; |
137 | ||
38f4d138 | 138 | crc = crc32(0, NULL, 0); |
e4fbbfe9 | 139 | |
e4fbbfe9 | 140 | if (pathlen > 0xffff) { |
562e25ab RS |
141 | return error("path too long (%d chars, SHA1: %s): %s", |
142 | (int)pathlen, sha1_to_hex(sha1), path); | |
e4fbbfe9 RS |
143 | } |
144 | ||
302b9282 | 145 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { |
e4fbbfe9 | 146 | method = 0; |
62cdce17 | 147 | attr2 = 16; |
e4fbbfe9 RS |
148 | out = NULL; |
149 | uncompressed_size = 0; | |
150 | compressed_size = 0; | |
62cdce17 RS |
151 | } else if (S_ISREG(mode) || S_ISLNK(mode)) { |
152 | method = 0; | |
76bf8d0e DP |
153 | attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : |
154 | (mode & 0111) ? ((mode) << 16) : 0; | |
3a176c6c | 155 | if (S_ISREG(mode) && args->compression_level != 0) |
62cdce17 | 156 | method = 8; |
e4fbbfe9 RS |
157 | crc = crc32(crc, buffer, size); |
158 | out = buffer; | |
159 | uncompressed_size = size; | |
160 | compressed_size = size; | |
161 | } else { | |
562e25ab RS |
162 | return error("unsupported file mode: 0%o (SHA1: %s)", mode, |
163 | sha1_to_hex(sha1)); | |
e4fbbfe9 RS |
164 | } |
165 | ||
166 | if (method == 8) { | |
3a176c6c RS |
167 | deflated = zlib_deflate(buffer, size, args->compression_level, |
168 | &compressed_size); | |
e4fbbfe9 RS |
169 | if (deflated && compressed_size - 6 < size) { |
170 | /* ZLIB --> raw compressed data (see RFC 1950) */ | |
171 | /* CMF and FLG ... */ | |
172 | out = (unsigned char *)deflated + 2; | |
173 | compressed_size -= 6; /* ... and ADLER32 */ | |
174 | } else { | |
175 | method = 0; | |
176 | compressed_size = size; | |
177 | } | |
178 | } | |
179 | ||
180 | /* make sure we have enough free space in the dictionary */ | |
0ea865ce | 181 | direntsize = ZIP_DIR_HEADER_SIZE + pathlen; |
e4fbbfe9 RS |
182 | while (zip_dir_size < zip_dir_offset + direntsize) { |
183 | zip_dir_size += ZIP_DIRECTORY_MIN_SIZE; | |
184 | zip_dir = xrealloc(zip_dir, zip_dir_size); | |
185 | } | |
186 | ||
187 | copy_le32(dirent.magic, 0x02014b50); | |
76bf8d0e DP |
188 | copy_le16(dirent.creator_version, |
189 | S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0); | |
cf72fb07 | 190 | copy_le16(dirent.version, 10); |
e4fbbfe9 RS |
191 | copy_le16(dirent.flags, 0); |
192 | copy_le16(dirent.compression_method, method); | |
193 | copy_le16(dirent.mtime, zip_time); | |
194 | copy_le16(dirent.mdate, zip_date); | |
195 | copy_le32(dirent.crc32, crc); | |
196 | copy_le32(dirent.compressed_size, compressed_size); | |
197 | copy_le32(dirent.size, uncompressed_size); | |
198 | copy_le16(dirent.filename_length, pathlen); | |
199 | copy_le16(dirent.extra_length, 0); | |
200 | copy_le16(dirent.comment_length, 0); | |
201 | copy_le16(dirent.disk, 0); | |
202 | copy_le16(dirent.attr1, 0); | |
62cdce17 | 203 | copy_le32(dirent.attr2, attr2); |
e4fbbfe9 | 204 | copy_le32(dirent.offset, zip_offset); |
0ea865ce RS |
205 | memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE); |
206 | zip_dir_offset += ZIP_DIR_HEADER_SIZE; | |
e4fbbfe9 RS |
207 | memcpy(zip_dir + zip_dir_offset, path, pathlen); |
208 | zip_dir_offset += pathlen; | |
209 | zip_dir_entries++; | |
210 | ||
211 | copy_le32(header.magic, 0x04034b50); | |
cf72fb07 | 212 | copy_le16(header.version, 10); |
e4fbbfe9 RS |
213 | copy_le16(header.flags, 0); |
214 | copy_le16(header.compression_method, method); | |
215 | copy_le16(header.mtime, zip_time); | |
216 | copy_le16(header.mdate, zip_date); | |
217 | copy_le32(header.crc32, crc); | |
218 | copy_le32(header.compressed_size, compressed_size); | |
219 | copy_le32(header.size, uncompressed_size); | |
220 | copy_le16(header.filename_length, pathlen); | |
221 | copy_le16(header.extra_length, 0); | |
0ea865ce RS |
222 | write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE); |
223 | zip_offset += ZIP_LOCAL_HEADER_SIZE; | |
e4fbbfe9 RS |
224 | write_or_die(1, path, pathlen); |
225 | zip_offset += pathlen; | |
226 | if (compressed_size > 0) { | |
227 | write_or_die(1, out, compressed_size); | |
228 | zip_offset += compressed_size; | |
229 | } | |
230 | ||
e4fbbfe9 | 231 | free(deflated); |
e4fbbfe9 | 232 | |
562e25ab | 233 | return 0; |
e4fbbfe9 RS |
234 | } |
235 | ||
236 | static void write_zip_trailer(const unsigned char *sha1) | |
237 | { | |
238 | struct zip_dir_trailer trailer; | |
239 | ||
240 | copy_le32(trailer.magic, 0x06054b50); | |
241 | copy_le16(trailer.disk, 0); | |
242 | copy_le16(trailer.directory_start_disk, 0); | |
243 | copy_le16(trailer.entries_on_this_disk, zip_dir_entries); | |
244 | copy_le16(trailer.entries, zip_dir_entries); | |
245 | copy_le32(trailer.size, zip_dir_offset); | |
246 | copy_le32(trailer.offset, zip_offset); | |
247 | copy_le16(trailer.comment_length, sha1 ? 40 : 0); | |
248 | ||
249 | write_or_die(1, zip_dir, zip_dir_offset); | |
0ea865ce | 250 | write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE); |
e4fbbfe9 RS |
251 | if (sha1) |
252 | write_or_die(1, sha1_to_hex(sha1), 40); | |
253 | } | |
254 | ||
255 | static void dos_time(time_t *time, int *dos_date, int *dos_time) | |
256 | { | |
257 | struct tm *t = localtime(time); | |
258 | ||
259 | *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 + | |
260 | (t->tm_year + 1900 - 1980) * 512; | |
261 | *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048; | |
262 | } | |
263 | ||
4d7c9898 JK |
264 | static int write_zip_archive(const struct archiver *ar, |
265 | struct archiver_args *args) | |
ec06bff5 | 266 | { |
562e25ab RS |
267 | int err; |
268 | ||
ec06bff5 FBH |
269 | dos_time(&args->time, &zip_date, &zip_time); |
270 | ||
271 | zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE); | |
272 | zip_dir_size = ZIP_DIRECTORY_MIN_SIZE; | |
562e25ab RS |
273 | |
274 | err = write_archive_entries(args, write_zip_entry); | |
275 | if (!err) | |
276 | write_zip_trailer(args->commit_sha1); | |
ec06bff5 FBH |
277 | |
278 | free(zip_dir); | |
279 | ||
562e25ab | 280 | return err; |
ec06bff5 | 281 | } |
13e0f88d JK |
282 | |
283 | static struct archiver zip_archiver = { | |
284 | "zip", | |
285 | write_zip_archive, | |
7b97730b | 286 | ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE |
13e0f88d JK |
287 | }; |
288 | ||
289 | void init_zip_archiver(void) | |
290 | { | |
291 | register_archiver(&zip_archiver); | |
292 | } |