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Commit | Line | Data |
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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 | { | |
ed1c9977 | 71 | unsigned int j = hash_obj(obj->oid.hash, 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) { |
ed1c9977 | 95 | if (!hashcmp(sha1, obj->oid.hash)) |
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 | */ | |
35d803bc | 107 | SWAP(obj_hash[i], obj_hash[first]); |
9a414486 | 108 | } |
0556a11a | 109 | return obj; |
175785e5 DB |
110 | } |
111 | ||
33bef7ea MH |
112 | /* |
113 | * Increase the size of the hash map stored in obj_hash to the next | |
114 | * power of 2 (but at least 32). Copy the existing values to the new | |
115 | * hash map. | |
116 | */ | |
0556a11a | 117 | static void grow_object_hash(void) |
175785e5 | 118 | { |
0556a11a | 119 | int i; |
9f36c9b7 NP |
120 | /* |
121 | * Note that this size must always be power-of-2 to match hash_obj | |
122 | * above. | |
123 | */ | |
0556a11a LT |
124 | int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size; |
125 | struct object **new_hash; | |
126 | ||
b3c952f8 | 127 | new_hash = xcalloc(new_hash_size, sizeof(struct object *)); |
0556a11a LT |
128 | for (i = 0; i < obj_hash_size; i++) { |
129 | struct object *obj = obj_hash[i]; | |
130 | if (!obj) | |
131 | continue; | |
132 | insert_obj_hash(obj, new_hash, new_hash_size); | |
133 | } | |
134 | free(obj_hash); | |
135 | obj_hash = new_hash; | |
136 | obj_hash_size = new_hash_size; | |
175785e5 DB |
137 | } |
138 | ||
d36f51c1 | 139 | void *create_object(const unsigned char *sha1, void *o) |
175785e5 | 140 | { |
100c5f3b LT |
141 | struct object *obj = o; |
142 | ||
175785e5 | 143 | obj->parsed = 0; |
175785e5 | 144 | obj->used = 0; |
0556a11a | 145 | obj->flags = 0; |
ed1c9977 | 146 | hashcpy(obj->oid.hash, sha1); |
175785e5 | 147 | |
0556a11a LT |
148 | if (obj_hash_size - 1 <= nr_objs * 2) |
149 | grow_object_hash(); | |
175785e5 | 150 | |
0556a11a | 151 | insert_obj_hash(obj, obj_hash, obj_hash_size); |
175785e5 | 152 | nr_objs++; |
100c5f3b | 153 | return obj; |
175785e5 DB |
154 | } |
155 | ||
8ff226a9 JK |
156 | void *object_as_type(struct object *obj, enum object_type type, int quiet) |
157 | { | |
158 | if (obj->type == type) | |
159 | return obj; | |
160 | else if (obj->type == OBJ_NONE) { | |
d66bebcb JK |
161 | if (type == OBJ_COMMIT) |
162 | ((struct commit *)obj)->index = alloc_commit_index(); | |
8ff226a9 JK |
163 | obj->type = type; |
164 | return obj; | |
165 | } | |
166 | else { | |
167 | if (!quiet) | |
168 | error("object %s is a %s, not a %s", | |
f2fd0760 | 169 | oid_to_hex(&obj->oid), |
8ff226a9 JK |
170 | typename(obj->type), typename(type)); |
171 | return NULL; | |
172 | } | |
173 | } | |
174 | ||
66e481b0 DB |
175 | struct object *lookup_unknown_object(const unsigned char *sha1) |
176 | { | |
177 | struct object *obj = lookup_object(sha1); | |
100c5f3b | 178 | if (!obj) |
d36f51c1 | 179 | obj = create_object(sha1, alloc_object_node()); |
66e481b0 DB |
180 | return obj; |
181 | } | |
182 | ||
c251c83d | 183 | struct object *parse_object_buffer(const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p) |
9f613ddd JH |
184 | { |
185 | struct object *obj; | |
8e92e8f2 | 186 | *eaten_p = 0; |
9f613ddd | 187 | |
cc216827 | 188 | obj = NULL; |
21666f1a | 189 | if (type == OBJ_BLOB) { |
c251c83d | 190 | struct blob *blob = lookup_blob(oid); |
cc216827 | 191 | if (blob) { |
d0b8c9e5 MK |
192 | if (parse_blob_buffer(blob, buffer, size)) |
193 | return NULL; | |
cc216827 JM |
194 | obj = &blob->object; |
195 | } | |
21666f1a | 196 | } else if (type == OBJ_TREE) { |
c251c83d | 197 | struct tree *tree = lookup_tree(oid); |
cc216827 JM |
198 | if (tree) { |
199 | obj = &tree->object; | |
68be2fea JH |
200 | if (!tree->buffer) |
201 | tree->object.parsed = 0; | |
cc216827 | 202 | if (!tree->object.parsed) { |
d0b8c9e5 MK |
203 | if (parse_tree_buffer(tree, buffer, size)) |
204 | return NULL; | |
8e92e8f2 | 205 | *eaten_p = 1; |
cc216827 | 206 | } |
9f613ddd | 207 | } |
21666f1a | 208 | } else if (type == OBJ_COMMIT) { |
c251c83d | 209 | struct commit *commit = lookup_commit(oid); |
cc216827 | 210 | if (commit) { |
d0b8c9e5 MK |
211 | if (parse_commit_buffer(commit, buffer, size)) |
212 | return NULL; | |
8597ea3a JK |
213 | if (!get_cached_commit_buffer(commit, NULL)) { |
214 | set_commit_buffer(commit, buffer, size); | |
8e92e8f2 | 215 | *eaten_p = 1; |
cc216827 JM |
216 | } |
217 | obj = &commit->object; | |
9f613ddd | 218 | } |
21666f1a | 219 | } else if (type == OBJ_TAG) { |
c251c83d | 220 | struct tag *tag = lookup_tag(oid); |
cc216827 | 221 | if (tag) { |
d0b8c9e5 MK |
222 | if (parse_tag_buffer(tag, buffer, size)) |
223 | return NULL; | |
cc216827 JM |
224 | obj = &tag->object; |
225 | } | |
9f613ddd | 226 | } else { |
c251c83d | 227 | warning("object %s has unknown type id %d", oid_to_hex(oid), type); |
9f613ddd JH |
228 | obj = NULL; |
229 | } | |
9f613ddd JH |
230 | return obj; |
231 | } | |
232 | ||
c251c83d | 233 | struct object *parse_object_or_die(const struct object_id *oid, |
75a95490 JK |
234 | const char *name) |
235 | { | |
c251c83d | 236 | struct object *o = parse_object(oid); |
75a95490 JK |
237 | if (o) |
238 | return o; | |
239 | ||
c251c83d | 240 | die(_("unable to parse object: %s"), name ? name : oid_to_hex(oid)); |
75a95490 JK |
241 | } |
242 | ||
c251c83d | 243 | struct object *parse_object(const struct object_id *oid) |
e9eefa67 | 244 | { |
c4584ae3 | 245 | unsigned long size; |
21666f1a | 246 | enum object_type type; |
9f613ddd | 247 | int eaten; |
c251c83d | 248 | const unsigned char *repl = lookup_replace_object(oid->hash); |
ccdc6037 JK |
249 | void *buffer; |
250 | struct object *obj; | |
251 | ||
c251c83d | 252 | obj = lookup_object(oid->hash); |
ccdc6037 JK |
253 | if (obj && obj->parsed) |
254 | return obj; | |
9f613ddd | 255 | |
090ea126 | 256 | if ((obj && obj->type == OBJ_BLOB) || |
c251c83d | 257 | (!obj && has_object_file(oid) && |
258 | sha1_object_info(oid->hash, NULL) == OBJ_BLOB)) { | |
090ea126 | 259 | if (check_sha1_signature(repl, NULL, 0, NULL) < 0) { |
c251c83d | 260 | error("sha1 mismatch %s", oid_to_hex(oid)); |
090ea126 NTND |
261 | return NULL; |
262 | } | |
c251c83d | 263 | parse_blob_buffer(lookup_blob(oid), NULL, 0); |
264 | return lookup_object(oid->hash); | |
090ea126 NTND |
265 | } |
266 | ||
c251c83d | 267 | buffer = read_sha1_file(oid->hash, &type, &size); |
c4584ae3 | 268 | if (buffer) { |
0e87c367 | 269 | if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) { |
0b1f1130 | 270 | free(buffer); |
82247e9b | 271 | error("sha1 mismatch %s", sha1_to_hex(repl)); |
acdeec62 LT |
272 | return NULL; |
273 | } | |
9f613ddd | 274 | |
c251c83d | 275 | obj = parse_object_buffer(oid, type, size, buffer, &eaten); |
9f613ddd JH |
276 | if (!eaten) |
277 | free(buffer); | |
bd2c39f5 | 278 | return obj; |
e9eefa67 DB |
279 | } |
280 | return NULL; | |
281 | } | |
66e481b0 DB |
282 | |
283 | struct object_list *object_list_insert(struct object *item, | |
284 | struct object_list **list_p) | |
285 | { | |
286 | struct object_list *new_list = xmalloc(sizeof(struct object_list)); | |
55b4e9e4 JH |
287 | new_list->item = item; |
288 | new_list->next = *list_p; | |
289 | *list_p = new_list; | |
290 | return new_list; | |
66e481b0 DB |
291 | } |
292 | ||
66e481b0 DB |
293 | int object_list_contains(struct object_list *list, struct object *obj) |
294 | { | |
295 | while (list) { | |
296 | if (list->item == obj) | |
297 | return 1; | |
298 | list = list->next; | |
299 | } | |
300 | return 0; | |
301 | } | |
1f1e895f | 302 | |
31faeb20 MH |
303 | /* |
304 | * A zero-length string to which object_array_entry::name can be | |
305 | * initialized without requiring a malloc/free. | |
306 | */ | |
307 | static char object_array_slopbuf[1]; | |
308 | ||
9e0c3c4f JK |
309 | void add_object_array_with_path(struct object *obj, const char *name, |
310 | struct object_array *array, | |
311 | unsigned mode, const char *path) | |
1f1e895f LT |
312 | { |
313 | unsigned nr = array->nr; | |
314 | unsigned alloc = array->alloc; | |
315 | struct object_array_entry *objects = array->objects; | |
31faeb20 | 316 | struct object_array_entry *entry; |
1f1e895f LT |
317 | |
318 | if (nr >= alloc) { | |
319 | alloc = (alloc + 32) * 2; | |
2756ca43 | 320 | REALLOC_ARRAY(objects, alloc); |
1f1e895f LT |
321 | array->alloc = alloc; |
322 | array->objects = objects; | |
323 | } | |
31faeb20 MH |
324 | entry = &objects[nr]; |
325 | entry->item = obj; | |
326 | if (!name) | |
327 | entry->name = NULL; | |
328 | else if (!*name) | |
329 | /* Use our own empty string instead of allocating one: */ | |
330 | entry->name = object_array_slopbuf; | |
331 | else | |
332 | entry->name = xstrdup(name); | |
333 | entry->mode = mode; | |
9e0c3c4f JK |
334 | if (path) |
335 | entry->path = xstrdup(path); | |
336 | else | |
337 | entry->path = NULL; | |
1f1e895f LT |
338 | array->nr = ++nr; |
339 | } | |
b2a6d1c6 | 340 | |
afa15f3c MG |
341 | void add_object_array(struct object *obj, const char *name, struct object_array *array) |
342 | { | |
189a1222 | 343 | add_object_array_with_path(obj, name, array, S_IFINVALID, NULL); |
afa15f3c MG |
344 | } |
345 | ||
68f49235 JK |
346 | /* |
347 | * Free all memory associated with an entry; the result is | |
348 | * in an unspecified state and should not be examined. | |
349 | */ | |
350 | static void object_array_release_entry(struct object_array_entry *ent) | |
351 | { | |
352 | if (ent->name != object_array_slopbuf) | |
353 | free(ent->name); | |
9e0c3c4f | 354 | free(ent->path); |
68f49235 JK |
355 | } |
356 | ||
aeb4a51e MH |
357 | void object_array_filter(struct object_array *array, |
358 | object_array_each_func_t want, void *cb_data) | |
b2a6d1c6 | 359 | { |
aeb4a51e | 360 | unsigned nr = array->nr, src, dst; |
b2a6d1c6 JH |
361 | struct object_array_entry *objects = array->objects; |
362 | ||
aeb4a51e MH |
363 | for (src = dst = 0; src < nr; src++) { |
364 | if (want(&objects[src], cb_data)) { | |
b2a6d1c6 JH |
365 | if (src != dst) |
366 | objects[dst] = objects[src]; | |
367 | dst++; | |
31faeb20 | 368 | } else { |
68f49235 | 369 | object_array_release_entry(&objects[src]); |
aeb4a51e MH |
370 | } |
371 | } | |
372 | array->nr = dst; | |
373 | } | |
374 | ||
46be8231 JK |
375 | void object_array_clear(struct object_array *array) |
376 | { | |
377 | int i; | |
378 | for (i = 0; i < array->nr; i++) | |
379 | object_array_release_entry(&array->objects[i]); | |
6a83d902 | 380 | FREE_AND_NULL(array->objects); |
46be8231 JK |
381 | array->nr = array->alloc = 0; |
382 | } | |
383 | ||
1506510c MH |
384 | /* |
385 | * Return true iff array already contains an entry with name. | |
386 | */ | |
387 | static int contains_name(struct object_array *array, const char *name) | |
388 | { | |
389 | unsigned nr = array->nr, i; | |
390 | struct object_array_entry *object = array->objects; | |
391 | ||
392 | for (i = 0; i < nr; i++, object++) | |
393 | if (!strcmp(object->name, name)) | |
394 | return 1; | |
395 | return 0; | |
396 | } | |
397 | ||
b2a6d1c6 JH |
398 | void object_array_remove_duplicates(struct object_array *array) |
399 | { | |
1506510c | 400 | unsigned nr = array->nr, src; |
b2a6d1c6 JH |
401 | struct object_array_entry *objects = array->objects; |
402 | ||
1506510c MH |
403 | array->nr = 0; |
404 | for (src = 0; src < nr; src++) { | |
405 | if (!contains_name(array, objects[src].name)) { | |
406 | if (src != array->nr) | |
407 | objects[array->nr] = objects[src]; | |
408 | array->nr++; | |
31faeb20 | 409 | } else { |
68f49235 | 410 | object_array_release_entry(&objects[src]); |
b2a6d1c6 | 411 | } |
b2a6d1c6 JH |
412 | } |
413 | } | |
bcc0a3ea HV |
414 | |
415 | void clear_object_flags(unsigned flags) | |
416 | { | |
417 | int i; | |
418 | ||
419 | for (i=0; i < obj_hash_size; i++) { | |
420 | struct object *obj = obj_hash[i]; | |
421 | if (obj) | |
422 | obj->flags &= ~flags; | |
423 | } | |
424 | } |