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Commit | Line | Data |
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bad50dc8 | 1 | #include "cache.h" |
74536958 | 2 | #include "object.h" |
8ee378a0 | 3 | #include "delta.h" |
a733cb60 | 4 | #include "pack.h" |
bad50dc8 | 5 | |
d36f7b80 LT |
6 | #include <sys/time.h> |
7 | ||
8 | static int dry_run, quiet; | |
67e5a5ec | 9 | static const char unpack_usage[] = "git-unpack-objects < pack-file"; |
bad50dc8 | 10 | |
67e5a5ec LT |
11 | /* We always read in 4kB chunks. */ |
12 | static unsigned char buffer[4096]; | |
13 | static unsigned long offset, len, eof; | |
14 | static SHA_CTX ctx; | |
bad50dc8 | 15 | |
67e5a5ec LT |
16 | /* |
17 | * Make sure at least "min" bytes are available in the buffer, and | |
18 | * return the pointer to the buffer. | |
19 | */ | |
20 | static void * fill(int min) | |
21 | { | |
22 | if (min <= len) | |
23 | return buffer + offset; | |
24 | if (eof) | |
25 | die("unable to fill input"); | |
26 | if (min > sizeof(buffer)) | |
27 | die("cannot fill %d bytes", min); | |
28 | if (offset) { | |
29 | SHA1_Update(&ctx, buffer, offset); | |
30 | memcpy(buffer, buffer + offset, len); | |
31 | offset = 0; | |
32 | } | |
33 | do { | |
34 | int ret = read(0, buffer + len, sizeof(buffer) - len); | |
35 | if (ret <= 0) { | |
36 | if (!ret) | |
37 | die("early EOF"); | |
38 | if (errno == EAGAIN || errno == EINTR) | |
39 | continue; | |
40 | die("read error on input: %s", strerror(errno)); | |
41 | } | |
42 | len += ret; | |
43 | } while (len < min); | |
44 | return buffer; | |
45 | } | |
74536958 | 46 | |
67e5a5ec LT |
47 | static void use(int bytes) |
48 | { | |
49 | if (bytes > len) | |
50 | die("used more bytes than were available"); | |
51 | len -= bytes; | |
52 | offset += bytes; | |
53 | } | |
bad50dc8 | 54 | |
67e5a5ec | 55 | static void *get_data(unsigned long size) |
bad50dc8 | 56 | { |
67e5a5ec LT |
57 | z_stream stream; |
58 | void *buf = xmalloc(size); | |
59 | ||
67e5a5ec LT |
60 | memset(&stream, 0, sizeof(stream)); |
61 | ||
62 | stream.next_out = buf; | |
63 | stream.avail_out = size; | |
64 | stream.next_in = fill(1); | |
65 | stream.avail_in = len; | |
66 | inflateInit(&stream); | |
67 | ||
68 | for (;;) { | |
69 | int ret = inflate(&stream, 0); | |
70 | use(len - stream.avail_in); | |
71 | if (stream.total_out == size && ret == Z_STREAM_END) | |
72 | break; | |
73 | if (ret != Z_OK) | |
74 | die("inflate returned %d\n", ret); | |
75 | stream.next_in = fill(1); | |
76 | stream.avail_in = len; | |
77 | } | |
78 | return buf; | |
bad50dc8 LT |
79 | } |
80 | ||
67e5a5ec LT |
81 | struct delta_info { |
82 | unsigned char base_sha1[20]; | |
83 | unsigned long size; | |
84 | void *delta; | |
85 | struct delta_info *next; | |
86 | }; | |
87 | ||
88 | static struct delta_info *delta_list; | |
89 | ||
90 | static void add_delta_to_list(unsigned char *base_sha1, void *delta, unsigned long size) | |
bad50dc8 | 91 | { |
67e5a5ec | 92 | struct delta_info *info = xmalloc(sizeof(*info)); |
bad50dc8 | 93 | |
67e5a5ec LT |
94 | memcpy(info->base_sha1, base_sha1, 20); |
95 | info->size = size; | |
96 | info->delta = delta; | |
97 | info->next = delta_list; | |
98 | delta_list = info; | |
bad50dc8 LT |
99 | } |
100 | ||
cca7081a | 101 | static void added_object(unsigned char *sha1, const char *type, void *data, unsigned long size); |
67e5a5ec | 102 | |
cca7081a LT |
103 | static void write_object(void *buf, unsigned long size, const char *type) |
104 | { | |
105 | unsigned char sha1[20]; | |
106 | if (write_sha1_file(buf, size, type, sha1) < 0) | |
107 | die("failed to write object"); | |
108 | added_object(sha1, type, buf, size); | |
109 | } | |
110 | ||
111 | static int resolve_delta(const char *type, | |
67e5a5ec LT |
112 | void *base, unsigned long base_size, |
113 | void *delta, unsigned long delta_size) | |
bad50dc8 | 114 | { |
67e5a5ec LT |
115 | void *result; |
116 | unsigned long result_size; | |
bad50dc8 | 117 | |
67e5a5ec LT |
118 | result = patch_delta(base, base_size, |
119 | delta, delta_size, | |
120 | &result_size); | |
121 | if (!result) | |
122 | die("failed to apply delta"); | |
123 | free(delta); | |
cca7081a | 124 | write_object(result, result_size, type); |
67e5a5ec | 125 | free(result); |
bad50dc8 LT |
126 | return 0; |
127 | } | |
128 | ||
cca7081a | 129 | static void added_object(unsigned char *sha1, const char *type, void *data, unsigned long size) |
74536958 | 130 | { |
67e5a5ec LT |
131 | struct delta_info **p = &delta_list; |
132 | struct delta_info *info; | |
133 | ||
134 | while ((info = *p) != NULL) { | |
135 | if (!memcmp(info->base_sha1, sha1, 20)) { | |
136 | *p = info->next; | |
137 | p = &delta_list; | |
138 | resolve_delta(type, data, size, info->delta, info->size); | |
139 | free(info); | |
140 | continue; | |
141 | } | |
142 | p = &info->next; | |
143 | } | |
144 | } | |
145 | ||
146 | static int unpack_non_delta_entry(enum object_type kind, unsigned long size) | |
147 | { | |
148 | void *buf = get_data(size); | |
cca7081a | 149 | const char *type; |
8ee378a0 | 150 | |
8ee378a0 | 151 | switch (kind) { |
a733cb60 LT |
152 | case OBJ_COMMIT: type = "commit"; break; |
153 | case OBJ_TREE: type = "tree"; break; | |
154 | case OBJ_BLOB: type = "blob"; break; | |
155 | case OBJ_TAG: type = "tag"; break; | |
67e5a5ec | 156 | default: die("bad type %d", kind); |
8ee378a0 | 157 | } |
dddafffe LT |
158 | if (!dry_run) |
159 | write_object(buf, size, type); | |
67e5a5ec | 160 | free(buf); |
8ee378a0 JH |
161 | return 0; |
162 | } | |
163 | ||
67e5a5ec | 164 | static int unpack_delta_entry(unsigned long delta_size) |
8ee378a0 | 165 | { |
67e5a5ec LT |
166 | void *delta_data, *base; |
167 | unsigned long base_size; | |
8ee378a0 | 168 | char type[20]; |
67e5a5ec | 169 | unsigned char base_sha1[20]; |
8ee378a0 | 170 | |
67e5a5ec LT |
171 | memcpy(base_sha1, fill(20), 20); |
172 | use(20); | |
c4fb06c0 | 173 | |
67e5a5ec | 174 | delta_data = get_data(delta_size); |
dddafffe LT |
175 | if (dry_run) { |
176 | free(delta_data); | |
177 | return 0; | |
178 | } | |
8ee378a0 | 179 | |
c4fb06c0 | 180 | if (!has_sha1_file(base_sha1)) { |
67e5a5ec LT |
181 | add_delta_to_list(base_sha1, delta_data, delta_size); |
182 | return 0; | |
8ee378a0 | 183 | } |
c4fb06c0 | 184 | base = read_sha1_file(base_sha1, type, &base_size); |
8ee378a0 | 185 | if (!base) |
c4fb06c0 | 186 | die("failed to read delta-pack base object %s", sha1_to_hex(base_sha1)); |
67e5a5ec | 187 | return resolve_delta(type, base, base_size, delta_data, delta_size); |
8ee378a0 JH |
188 | } |
189 | ||
d36f7b80 | 190 | static void unpack_one(unsigned nr, unsigned total) |
8ee378a0 | 191 | { |
01247d87 | 192 | unsigned shift; |
a733cb60 | 193 | unsigned char *pack, c; |
67e5a5ec LT |
194 | unsigned long size; |
195 | enum object_type type; | |
74536958 | 196 | |
67e5a5ec LT |
197 | pack = fill(1); |
198 | c = *pack; | |
199 | use(1); | |
a733cb60 LT |
200 | type = (c >> 4) & 7; |
201 | size = (c & 15); | |
01247d87 | 202 | shift = 4; |
a733cb60 | 203 | while (c & 0x80) { |
67e5a5ec | 204 | pack = fill(1); |
a733cb60 | 205 | c = *pack++; |
67e5a5ec | 206 | use(1); |
01247d87 LT |
207 | size += (c & 0x7f) << shift; |
208 | shift += 7; | |
a733cb60 | 209 | } |
d36f7b80 LT |
210 | if (!quiet) { |
211 | static unsigned long last_sec; | |
212 | static unsigned last_percent; | |
213 | struct timeval now; | |
cf219196 | 214 | unsigned percentage = (nr * 100) / total; |
d36f7b80 LT |
215 | |
216 | gettimeofday(&now, NULL); | |
217 | if (percentage != last_percent || now.tv_sec != last_sec) { | |
218 | last_sec = now.tv_sec; | |
219 | last_percent = percentage; | |
220 | fprintf(stderr, "%4u%% (%u/%u) done\r", percentage, nr, total); | |
221 | } | |
222 | } | |
a733cb60 LT |
223 | switch (type) { |
224 | case OBJ_COMMIT: | |
225 | case OBJ_TREE: | |
226 | case OBJ_BLOB: | |
227 | case OBJ_TAG: | |
67e5a5ec | 228 | unpack_non_delta_entry(type, size); |
a733cb60 LT |
229 | return; |
230 | case OBJ_DELTA: | |
67e5a5ec | 231 | unpack_delta_entry(size); |
a733cb60 | 232 | return; |
67e5a5ec LT |
233 | default: |
234 | die("bad object type %d", type); | |
74536958 LT |
235 | } |
236 | } | |
237 | ||
238 | /* | |
239 | * We unpack from the end, older files first. Now, usually | |
240 | * there are deltas etc, so we'll not actually write the | |
241 | * objects in that order, but we might as well try.. | |
242 | */ | |
243 | static void unpack_all(void) | |
244 | { | |
67e5a5ec LT |
245 | int i; |
246 | struct pack_header *hdr = fill(sizeof(struct pack_header)); | |
247 | unsigned version = ntohl(hdr->hdr_version); | |
248 | unsigned nr_objects = ntohl(hdr->hdr_entries); | |
249 | ||
250 | if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE) | |
251 | die("bad pack file"); | |
01247d87 | 252 | if (version != PACK_VERSION) |
67e5a5ec LT |
253 | die("unable to handle pack file version %d", version); |
254 | fprintf(stderr, "Unpacking %d objects\n", nr_objects); | |
255 | ||
256 | use(sizeof(struct pack_header)); | |
257 | for (i = 0; i < nr_objects; i++) | |
cf219196 | 258 | unpack_one(i+1, nr_objects); |
67e5a5ec LT |
259 | if (delta_list) |
260 | die("unresolved deltas left after unpacking"); | |
74536958 LT |
261 | } |
262 | ||
bad50dc8 LT |
263 | int main(int argc, char **argv) |
264 | { | |
265 | int i; | |
67e5a5ec | 266 | unsigned char sha1[20]; |
bad50dc8 LT |
267 | |
268 | for (i = 1 ; i < argc; i++) { | |
269 | const char *arg = argv[i]; | |
270 | ||
271 | if (*arg == '-') { | |
74536958 LT |
272 | if (!strcmp(arg, "-n")) { |
273 | dry_run = 1; | |
274 | continue; | |
275 | } | |
d36f7b80 LT |
276 | if (!strcmp(arg, "-q")) { |
277 | quiet = 1; | |
278 | continue; | |
279 | } | |
bad50dc8 LT |
280 | usage(unpack_usage); |
281 | } | |
67e5a5ec LT |
282 | |
283 | /* We don't take any non-flag arguments now.. Maybe some day */ | |
bad50dc8 | 284 | usage(unpack_usage); |
67e5a5ec LT |
285 | } |
286 | SHA1_Init(&ctx); | |
74536958 | 287 | unpack_all(); |
67e5a5ec LT |
288 | SHA1_Update(&ctx, buffer, offset); |
289 | SHA1_Final(sha1, &ctx); | |
290 | if (memcmp(fill(20), sha1, 20)) | |
291 | die("final sha1 did not match"); | |
292 | use(20); | |
293 | ||
294 | /* Write the last part of the buffer to stdout */ | |
295 | while (len) { | |
296 | int ret = write(1, buffer + offset, len); | |
297 | if (!ret) | |
298 | break; | |
299 | if (ret < 0) { | |
300 | if (errno == EAGAIN || errno == EINTR) | |
301 | continue; | |
302 | break; | |
303 | } | |
304 | len -= ret; | |
305 | offset += ret; | |
306 | } | |
307 | ||
308 | /* All done */ | |
d36f7b80 LT |
309 | if (!quiet) |
310 | fprintf(stderr, "\n"); | |
bad50dc8 LT |
311 | return 0; |
312 | } |