]>
Commit | Line | Data |
---|---|---|
8f1d2e6f | 1 | #include "cache.h" |
175785e5 | 2 | #include "object.h" |
e9eefa67 DB |
3 | #include "blob.h" |
4 | #include "tree.h" | |
5 | #include "commit.h" | |
e9eefa67 | 6 | #include "tag.h" |
175785e5 | 7 | |
0556a11a LT |
8 | static struct object **obj_hash; |
9 | static int nr_objs, obj_hash_size; | |
fc046a75 LT |
10 | |
11 | unsigned int get_max_object_index(void) | |
12 | { | |
0556a11a | 13 | return obj_hash_size; |
fc046a75 LT |
14 | } |
15 | ||
16 | struct object *get_indexed_object(unsigned int idx) | |
17 | { | |
0556a11a | 18 | return obj_hash[idx]; |
fc046a75 | 19 | } |
175785e5 | 20 | |
df843662 NP |
21 | static const char *object_type_strings[] = { |
22 | NULL, /* OBJ_NONE = 0 */ | |
23 | "commit", /* OBJ_COMMIT = 1 */ | |
24 | "tree", /* OBJ_TREE = 2 */ | |
25 | "blob", /* OBJ_BLOB = 3 */ | |
26 | "tag", /* OBJ_TAG = 4 */ | |
885a86ab LT |
27 | }; |
28 | ||
df843662 NP |
29 | const char *typename(unsigned int type) |
30 | { | |
31 | if (type >= ARRAY_SIZE(object_type_strings)) | |
32 | return NULL; | |
33 | return object_type_strings[type]; | |
34 | } | |
35 | ||
fe8e3b71 | 36 | int type_from_string_gently(const char *str, ssize_t len, int gentle) |
df843662 NP |
37 | { |
38 | int i; | |
39 | ||
fe8e3b71 JS |
40 | if (len < 0) |
41 | len = strlen(str); | |
42 | ||
df843662 | 43 | for (i = 1; i < ARRAY_SIZE(object_type_strings); i++) |
b7994af0 JK |
44 | if (!strncmp(str, object_type_strings[i], len) && |
45 | object_type_strings[i][len] == '\0') | |
df843662 | 46 | return i; |
fe8e3b71 JS |
47 | |
48 | if (gentle) | |
49 | return -1; | |
50 | ||
df843662 NP |
51 | die("invalid object type \"%s\"", str); |
52 | } | |
53 | ||
33bef7ea MH |
54 | /* |
55 | * Return a numerical hash value between 0 and n-1 for the object with | |
56 | * the specified sha1. n must be a power of 2. Please note that the | |
57 | * return value is *not* consistent across computer architectures. | |
58 | */ | |
9f36c9b7 | 59 | static unsigned int hash_obj(const unsigned char *sha1, unsigned int n) |
0556a11a | 60 | { |
039dc71a | 61 | return sha1hash(sha1) & (n - 1); |
0556a11a LT |
62 | } |
63 | ||
33bef7ea MH |
64 | /* |
65 | * Insert obj into the hash table hash, which has length size (which | |
66 | * must be a power of 2). On collisions, simply overflow to the next | |
67 | * empty bucket. | |
68 | */ | |
0556a11a LT |
69 | static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size) |
70 | { | |
9f36c9b7 | 71 | unsigned int j = hash_obj(obj->sha1, size); |
0556a11a LT |
72 | |
73 | while (hash[j]) { | |
74 | j++; | |
75 | if (j >= size) | |
76 | j = 0; | |
77 | } | |
78 | hash[j] = obj; | |
79 | } | |
80 | ||
33bef7ea MH |
81 | /* |
82 | * Look up the record for the given sha1 in the hash map stored in | |
83 | * obj_hash. Return NULL if it was not found. | |
84 | */ | |
0556a11a | 85 | struct object *lookup_object(const unsigned char *sha1) |
175785e5 | 86 | { |
9a414486 | 87 | unsigned int i, first; |
0556a11a | 88 | struct object *obj; |
175785e5 | 89 | |
0556a11a LT |
90 | if (!obj_hash) |
91 | return NULL; | |
175785e5 | 92 | |
9f36c9b7 | 93 | first = i = hash_obj(sha1, obj_hash_size); |
0556a11a | 94 | while ((obj = obj_hash[i]) != NULL) { |
a89fccd2 | 95 | if (!hashcmp(sha1, obj->sha1)) |
0556a11a | 96 | break; |
070879ca | 97 | i++; |
0556a11a | 98 | if (i == obj_hash_size) |
070879ca JS |
99 | i = 0; |
100 | } | |
9a414486 JK |
101 | if (obj && i != first) { |
102 | /* | |
103 | * Move object to where we started to look for it so | |
104 | * that we do not need to walk the hash table the next | |
105 | * time we look for it. | |
106 | */ | |
107 | struct object *tmp = obj_hash[i]; | |
108 | obj_hash[i] = obj_hash[first]; | |
109 | obj_hash[first] = tmp; | |
110 | } | |
0556a11a | 111 | return obj; |
175785e5 DB |
112 | } |
113 | ||
33bef7ea MH |
114 | /* |
115 | * Increase the size of the hash map stored in obj_hash to the next | |
116 | * power of 2 (but at least 32). Copy the existing values to the new | |
117 | * hash map. | |
118 | */ | |
0556a11a | 119 | static void grow_object_hash(void) |
175785e5 | 120 | { |
0556a11a | 121 | int i; |
9f36c9b7 NP |
122 | /* |
123 | * Note that this size must always be power-of-2 to match hash_obj | |
124 | * above. | |
125 | */ | |
0556a11a LT |
126 | int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size; |
127 | struct object **new_hash; | |
128 | ||
b3c952f8 | 129 | new_hash = xcalloc(new_hash_size, sizeof(struct object *)); |
0556a11a LT |
130 | for (i = 0; i < obj_hash_size; i++) { |
131 | struct object *obj = obj_hash[i]; | |
132 | if (!obj) | |
133 | continue; | |
134 | insert_obj_hash(obj, new_hash, new_hash_size); | |
135 | } | |
136 | free(obj_hash); | |
137 | obj_hash = new_hash; | |
138 | obj_hash_size = new_hash_size; | |
175785e5 DB |
139 | } |
140 | ||
d36f51c1 | 141 | void *create_object(const unsigned char *sha1, void *o) |
175785e5 | 142 | { |
100c5f3b LT |
143 | struct object *obj = o; |
144 | ||
175785e5 | 145 | obj->parsed = 0; |
175785e5 | 146 | obj->used = 0; |
0556a11a | 147 | obj->flags = 0; |
e702496e | 148 | hashcpy(obj->sha1, sha1); |
175785e5 | 149 | |
0556a11a LT |
150 | if (obj_hash_size - 1 <= nr_objs * 2) |
151 | grow_object_hash(); | |
175785e5 | 152 | |
0556a11a | 153 | insert_obj_hash(obj, obj_hash, obj_hash_size); |
175785e5 | 154 | nr_objs++; |
100c5f3b | 155 | return obj; |
175785e5 DB |
156 | } |
157 | ||
8ff226a9 JK |
158 | void *object_as_type(struct object *obj, enum object_type type, int quiet) |
159 | { | |
160 | if (obj->type == type) | |
161 | return obj; | |
162 | else if (obj->type == OBJ_NONE) { | |
d66bebcb JK |
163 | if (type == OBJ_COMMIT) |
164 | ((struct commit *)obj)->index = alloc_commit_index(); | |
8ff226a9 JK |
165 | obj->type = type; |
166 | return obj; | |
167 | } | |
168 | else { | |
169 | if (!quiet) | |
170 | error("object %s is a %s, not a %s", | |
171 | sha1_to_hex(obj->sha1), | |
172 | typename(obj->type), typename(type)); | |
173 | return NULL; | |
174 | } | |
175 | } | |
176 | ||
66e481b0 DB |
177 | struct object *lookup_unknown_object(const unsigned char *sha1) |
178 | { | |
179 | struct object *obj = lookup_object(sha1); | |
100c5f3b | 180 | if (!obj) |
d36f51c1 | 181 | obj = create_object(sha1, alloc_object_node()); |
66e481b0 DB |
182 | return obj; |
183 | } | |
184 | ||
21666f1a | 185 | struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p) |
9f613ddd JH |
186 | { |
187 | struct object *obj; | |
8e92e8f2 | 188 | *eaten_p = 0; |
9f613ddd | 189 | |
cc216827 | 190 | obj = NULL; |
21666f1a | 191 | if (type == OBJ_BLOB) { |
9f613ddd | 192 | struct blob *blob = lookup_blob(sha1); |
cc216827 | 193 | if (blob) { |
d0b8c9e5 MK |
194 | if (parse_blob_buffer(blob, buffer, size)) |
195 | return NULL; | |
cc216827 JM |
196 | obj = &blob->object; |
197 | } | |
21666f1a | 198 | } else if (type == OBJ_TREE) { |
9f613ddd | 199 | struct tree *tree = lookup_tree(sha1); |
cc216827 JM |
200 | if (tree) { |
201 | obj = &tree->object; | |
68be2fea JH |
202 | if (!tree->buffer) |
203 | tree->object.parsed = 0; | |
cc216827 | 204 | if (!tree->object.parsed) { |
d0b8c9e5 MK |
205 | if (parse_tree_buffer(tree, buffer, size)) |
206 | return NULL; | |
8e92e8f2 | 207 | *eaten_p = 1; |
cc216827 | 208 | } |
9f613ddd | 209 | } |
21666f1a | 210 | } else if (type == OBJ_COMMIT) { |
9f613ddd | 211 | struct commit *commit = lookup_commit(sha1); |
cc216827 | 212 | if (commit) { |
d0b8c9e5 MK |
213 | if (parse_commit_buffer(commit, buffer, size)) |
214 | return NULL; | |
8597ea3a JK |
215 | if (!get_cached_commit_buffer(commit, NULL)) { |
216 | set_commit_buffer(commit, buffer, size); | |
8e92e8f2 | 217 | *eaten_p = 1; |
cc216827 JM |
218 | } |
219 | obj = &commit->object; | |
9f613ddd | 220 | } |
21666f1a | 221 | } else if (type == OBJ_TAG) { |
9f613ddd | 222 | struct tag *tag = lookup_tag(sha1); |
cc216827 | 223 | if (tag) { |
d0b8c9e5 MK |
224 | if (parse_tag_buffer(tag, buffer, size)) |
225 | return NULL; | |
cc216827 JM |
226 | obj = &tag->object; |
227 | } | |
9f613ddd | 228 | } else { |
82247e9b | 229 | warning("object %s has unknown type id %d", sha1_to_hex(sha1), type); |
9f613ddd JH |
230 | obj = NULL; |
231 | } | |
9f613ddd JH |
232 | return obj; |
233 | } | |
234 | ||
75a95490 JK |
235 | struct object *parse_object_or_die(const unsigned char *sha1, |
236 | const char *name) | |
237 | { | |
238 | struct object *o = parse_object(sha1); | |
239 | if (o) | |
240 | return o; | |
241 | ||
242 | die(_("unable to parse object: %s"), name ? name : sha1_to_hex(sha1)); | |
243 | } | |
244 | ||
5d6ccf5c | 245 | struct object *parse_object(const unsigned char *sha1) |
e9eefa67 | 246 | { |
c4584ae3 | 247 | unsigned long size; |
21666f1a | 248 | enum object_type type; |
9f613ddd | 249 | int eaten; |
4bbf5a26 | 250 | const unsigned char *repl = lookup_replace_object(sha1); |
ccdc6037 JK |
251 | void *buffer; |
252 | struct object *obj; | |
253 | ||
254 | obj = lookup_object(sha1); | |
255 | if (obj && obj->parsed) | |
256 | return obj; | |
9f613ddd | 257 | |
090ea126 NTND |
258 | if ((obj && obj->type == OBJ_BLOB) || |
259 | (!obj && has_sha1_file(sha1) && | |
260 | sha1_object_info(sha1, NULL) == OBJ_BLOB)) { | |
261 | if (check_sha1_signature(repl, NULL, 0, NULL) < 0) { | |
82247e9b | 262 | error("sha1 mismatch %s", sha1_to_hex(repl)); |
090ea126 NTND |
263 | return NULL; |
264 | } | |
265 | parse_blob_buffer(lookup_blob(sha1), NULL, 0); | |
266 | return lookup_object(sha1); | |
267 | } | |
268 | ||
ccdc6037 | 269 | buffer = read_sha1_file(sha1, &type, &size); |
c4584ae3 | 270 | if (buffer) { |
0e87c367 | 271 | if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) { |
0b1f1130 | 272 | free(buffer); |
82247e9b | 273 | error("sha1 mismatch %s", sha1_to_hex(repl)); |
acdeec62 LT |
274 | return NULL; |
275 | } | |
9f613ddd | 276 | |
2e3400c0 | 277 | obj = parse_object_buffer(sha1, type, size, buffer, &eaten); |
9f613ddd JH |
278 | if (!eaten) |
279 | free(buffer); | |
bd2c39f5 | 280 | return obj; |
e9eefa67 DB |
281 | } |
282 | return NULL; | |
283 | } | |
66e481b0 DB |
284 | |
285 | struct object_list *object_list_insert(struct object *item, | |
286 | struct object_list **list_p) | |
287 | { | |
288 | struct object_list *new_list = xmalloc(sizeof(struct object_list)); | |
55b4e9e4 JH |
289 | new_list->item = item; |
290 | new_list->next = *list_p; | |
291 | *list_p = new_list; | |
292 | return new_list; | |
66e481b0 DB |
293 | } |
294 | ||
66e481b0 DB |
295 | int object_list_contains(struct object_list *list, struct object *obj) |
296 | { | |
297 | while (list) { | |
298 | if (list->item == obj) | |
299 | return 1; | |
300 | list = list->next; | |
301 | } | |
302 | return 0; | |
303 | } | |
1f1e895f | 304 | |
31faeb20 MH |
305 | /* |
306 | * A zero-length string to which object_array_entry::name can be | |
307 | * initialized without requiring a malloc/free. | |
308 | */ | |
309 | static char object_array_slopbuf[1]; | |
310 | ||
9e0c3c4f JK |
311 | void add_object_array_with_path(struct object *obj, const char *name, |
312 | struct object_array *array, | |
313 | unsigned mode, const char *path) | |
1f1e895f LT |
314 | { |
315 | unsigned nr = array->nr; | |
316 | unsigned alloc = array->alloc; | |
317 | struct object_array_entry *objects = array->objects; | |
31faeb20 | 318 | struct object_array_entry *entry; |
1f1e895f LT |
319 | |
320 | if (nr >= alloc) { | |
321 | alloc = (alloc + 32) * 2; | |
2756ca43 | 322 | REALLOC_ARRAY(objects, alloc); |
1f1e895f LT |
323 | array->alloc = alloc; |
324 | array->objects = objects; | |
325 | } | |
31faeb20 MH |
326 | entry = &objects[nr]; |
327 | entry->item = obj; | |
328 | if (!name) | |
329 | entry->name = NULL; | |
330 | else if (!*name) | |
331 | /* Use our own empty string instead of allocating one: */ | |
332 | entry->name = object_array_slopbuf; | |
333 | else | |
334 | entry->name = xstrdup(name); | |
335 | entry->mode = mode; | |
9e0c3c4f JK |
336 | if (path) |
337 | entry->path = xstrdup(path); | |
338 | else | |
339 | entry->path = NULL; | |
1f1e895f LT |
340 | array->nr = ++nr; |
341 | } | |
b2a6d1c6 | 342 | |
afa15f3c MG |
343 | void add_object_array(struct object *obj, const char *name, struct object_array *array) |
344 | { | |
189a1222 | 345 | add_object_array_with_path(obj, name, array, S_IFINVALID, NULL); |
afa15f3c MG |
346 | } |
347 | ||
68f49235 JK |
348 | /* |
349 | * Free all memory associated with an entry; the result is | |
350 | * in an unspecified state and should not be examined. | |
351 | */ | |
352 | static void object_array_release_entry(struct object_array_entry *ent) | |
353 | { | |
354 | if (ent->name != object_array_slopbuf) | |
355 | free(ent->name); | |
9e0c3c4f | 356 | free(ent->path); |
68f49235 JK |
357 | } |
358 | ||
aeb4a51e MH |
359 | void object_array_filter(struct object_array *array, |
360 | object_array_each_func_t want, void *cb_data) | |
b2a6d1c6 | 361 | { |
aeb4a51e | 362 | unsigned nr = array->nr, src, dst; |
b2a6d1c6 JH |
363 | struct object_array_entry *objects = array->objects; |
364 | ||
aeb4a51e MH |
365 | for (src = dst = 0; src < nr; src++) { |
366 | if (want(&objects[src], cb_data)) { | |
b2a6d1c6 JH |
367 | if (src != dst) |
368 | objects[dst] = objects[src]; | |
369 | dst++; | |
31faeb20 | 370 | } else { |
68f49235 | 371 | object_array_release_entry(&objects[src]); |
aeb4a51e MH |
372 | } |
373 | } | |
374 | array->nr = dst; | |
375 | } | |
376 | ||
46be8231 JK |
377 | void object_array_clear(struct object_array *array) |
378 | { | |
379 | int i; | |
380 | for (i = 0; i < array->nr; i++) | |
381 | object_array_release_entry(&array->objects[i]); | |
382 | free(array->objects); | |
383 | array->objects = NULL; | |
384 | array->nr = array->alloc = 0; | |
385 | } | |
386 | ||
1506510c MH |
387 | /* |
388 | * Return true iff array already contains an entry with name. | |
389 | */ | |
390 | static int contains_name(struct object_array *array, const char *name) | |
391 | { | |
392 | unsigned nr = array->nr, i; | |
393 | struct object_array_entry *object = array->objects; | |
394 | ||
395 | for (i = 0; i < nr; i++, object++) | |
396 | if (!strcmp(object->name, name)) | |
397 | return 1; | |
398 | return 0; | |
399 | } | |
400 | ||
b2a6d1c6 JH |
401 | void object_array_remove_duplicates(struct object_array *array) |
402 | { | |
1506510c | 403 | unsigned nr = array->nr, src; |
b2a6d1c6 JH |
404 | struct object_array_entry *objects = array->objects; |
405 | ||
1506510c MH |
406 | array->nr = 0; |
407 | for (src = 0; src < nr; src++) { | |
408 | if (!contains_name(array, objects[src].name)) { | |
409 | if (src != array->nr) | |
410 | objects[array->nr] = objects[src]; | |
411 | array->nr++; | |
31faeb20 | 412 | } else { |
68f49235 | 413 | object_array_release_entry(&objects[src]); |
b2a6d1c6 | 414 | } |
b2a6d1c6 JH |
415 | } |
416 | } | |
bcc0a3ea HV |
417 | |
418 | void clear_object_flags(unsigned flags) | |
419 | { | |
420 | int i; | |
421 | ||
422 | for (i=0; i < obj_hash_size; i++) { | |
423 | struct object *obj = obj_hash[i]; | |
424 | if (obj) | |
425 | obj->flags &= ~flags; | |
426 | } | |
427 | } |