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chromium / external / github.com / git / git / refs/tags/v1.5.3 / . / object.c
blob: 16793d9958a57664233b9e4468e112dfa1a8a915 [file] [log] [blame]
Junio C Hamano8f1d2e62006-01-07 09:33:54[diff] [blame]1#include "cache.h"
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]2#include "object.h"
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]6#include "tag.h"
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]7
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]8static struct object **obj_hash;
9static int nr_objs, obj_hash_size;
Linus Torvaldsfc046a72006-06-30 04:38:55[diff] [blame]10
11unsigned int get_max_object_index(void)
12{
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]13 return obj_hash_size;
Linus Torvaldsfc046a72006-06-30 04:38:55[diff] [blame]14}
15
16struct object *get_indexed_object(unsigned int idx)
17{
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]18 return obj_hash[idx];
Linus Torvaldsfc046a72006-06-30 04:38:55[diff] [blame]19}
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]20
Nicolas Pitredf843662007-02-26 19:55:58[diff] [blame]21static 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 */
Linus Torvalds885a86a2006-06-14 23:45:13[diff] [blame]27};
28
Nicolas Pitredf843662007-02-26 19:55:58[diff] [blame]29const 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
36int type_from_string(const char *str)
37{
38 int i;
39
40 for (i = 1; i < ARRAY_SIZE(object_type_strings); i++)
41 if (!strcmp(str, object_type_strings[i]))
42 return i;
43 die("invalid object type \"%s\"", str);
44}
45
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]46static unsigned int hash_obj(struct object *obj, unsigned int n)
47{
48 unsigned int hash = *(unsigned int *)obj->sha1;
49 return hash % n;
50}
51
52static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
53{
54 int j = hash_obj(obj, size);
55
56 while (hash[j]) {
57 j++;
58 if (j >= size)
59 j = 0;
60 }
61 hash[j] = obj;
62}
63
Johannes Schindelin070879c2006-02-12 01:57:57[diff] [blame]64static int hashtable_index(const unsigned char *sha1)
65{
Junio C Hamano2b796362006-02-12 02:51:19[diff] [blame]66 unsigned int i;
67 memcpy(&i, sha1, sizeof(unsigned int));
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]68 return (int)(i % obj_hash_size);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]69}
70
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]71struct object *lookup_object(const unsigned char *sha1)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]72{
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]73 int i;
74 struct object *obj;
75
76 if (!obj_hash)
77 return NULL;
78
79 i = hashtable_index(sha1);
80 while ((obj = obj_hash[i]) != NULL) {
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]81 if (!hashcmp(sha1, obj->sha1))
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]82 break;
83 i++;
84 if (i == obj_hash_size)
85 i = 0;
86 }
87 return obj;
88}
89
90static void grow_object_hash(void)
91{
92 int i;
93 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
94 struct object **new_hash;
95
Jonas Fonsecab3c952f2006-08-28 00:26:07[diff] [blame]96 new_hash = xcalloc(new_hash_size, sizeof(struct object *));
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]97 for (i = 0; i < obj_hash_size; i++) {
98 struct object *obj = obj_hash[i];
99 if (!obj)
100 continue;
101 insert_obj_hash(obj, new_hash, new_hash_size);
102 }
103 free(obj_hash);
104 obj_hash = new_hash;
105 obj_hash_size = new_hash_size;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]106}
107
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]108void *create_object(const unsigned char *sha1, int type, void *o)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]109{
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]110 struct object *obj = o;
111
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]112 obj->parsed = 0;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]113 obj->used = 0;
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]114 obj->type = type;
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]115 obj->flags = 0;
Shawn Pearcee7024962006-08-23 06:49:00[diff] [blame]116 hashcpy(obj->sha1, sha1);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]117
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]118 if (obj_hash_size - 1 <= nr_objs * 2)
119 grow_object_hash();
Johannes Schindelin070879c2006-02-12 01:57:57[diff] [blame]120
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]121 insert_obj_hash(obj, obj_hash, obj_hash_size);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]122 nr_objs++;
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]123 return obj;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]124}
125
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]126struct object *lookup_unknown_object(const unsigned char *sha1)
127{
128 struct object *obj = lookup_object(sha1);
Linus Torvalds100c5f32007-04-17 05:11:43[diff] [blame]129 if (!obj)
130 obj = create_object(sha1, OBJ_NONE, alloc_object_node());
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]131 return obj;
132}
133
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]134struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]135{
136 struct object *obj;
137 int eaten = 0;
138
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]139 if (type == OBJ_BLOB) {
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]140 struct blob *blob = lookup_blob(sha1);
141 parse_blob_buffer(blob, buffer, size);
142 obj = &blob->object;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]143 } else if (type == OBJ_TREE) {
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]144 struct tree *tree = lookup_tree(sha1);
145 obj = &tree->object;
146 if (!tree->object.parsed) {
147 parse_tree_buffer(tree, buffer, size);
148 eaten = 1;
149 }
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]150 } else if (type == OBJ_COMMIT) {
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]151 struct commit *commit = lookup_commit(sha1);
152 parse_commit_buffer(commit, buffer, size);
153 if (!commit->buffer) {
154 commit->buffer = buffer;
155 eaten = 1;
156 }
157 obj = &commit->object;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]158 } else if (type == OBJ_TAG) {
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]159 struct tag *tag = lookup_tag(sha1);
160 parse_tag_buffer(tag, buffer, size);
161 obj = &tag->object;
162 } else {
Sam Vilaine2ac7cb2007-06-06 10:25:17[diff] [blame]163 warning("object %s has unknown type id %d\n", sha1_to_hex(sha1), type);
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]164 obj = NULL;
165 }
Sam Vilaine2ac7cb2007-06-06 10:25:17[diff] [blame]166 if (obj && obj->type == OBJ_NONE)
167 obj->type = type;
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]168 *eaten_p = eaten;
169 return obj;
170}
171
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]172struct object *parse_object(const unsigned char *sha1)
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]173{
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]174 unsigned long size;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]175 enum object_type type;
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]176 int eaten;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]177 void *buffer = read_sha1_file(sha1, &type, &size);
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]178
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]179 if (buffer) {
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]180 struct object *obj;
Linus Torvaldsacdeec62007-03-20 17:05:20[diff] [blame]181 if (check_sha1_signature(sha1, buffer, size, typename(type)) < 0) {
Carlos Rica0b1f1132007-05-25 01:46:22[diff] [blame]182 free(buffer);
Linus Torvaldsacdeec62007-03-20 17:05:20[diff] [blame]183 error("sha1 mismatch %s\n", sha1_to_hex(sha1));
184 return NULL;
185 }
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]186
187 obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
188 if (!eaten)
189 free(buffer);
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]190 return obj;
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]191 }
192 return NULL;
193}
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]194
195struct object_list *object_list_insert(struct object *item,
196 struct object_list **list_p)
197{
198 struct object_list *new_list = xmalloc(sizeof(struct object_list));
199 new_list->item = item;
200 new_list->next = *list_p;
201 *list_p = new_list;
202 return new_list;
203}
204
Daniel Barkalow680bab32005-09-05 06:04:18[diff] [blame]205void object_list_append(struct object *item,
206 struct object_list **list_p)
207{
208 while (*list_p) {
209 list_p = &((*list_p)->next);
210 }
211 *list_p = xmalloc(sizeof(struct object_list));
212 (*list_p)->next = NULL;
213 (*list_p)->item = item;
214}
215
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]216unsigned object_list_length(struct object_list *list)
217{
218 unsigned ret = 0;
219 while (list) {
220 list = list->next;
221 ret++;
222 }
223 return ret;
224}
225
226int object_list_contains(struct object_list *list, struct object *obj)
227{
228 while (list) {
229 if (list->item == obj)
230 return 1;
231 list = list->next;
232 }
233 return 0;
234}
Linus Torvalds1f1e8952006-06-20 00:42:35[diff] [blame]235
236void add_object_array(struct object *obj, const char *name, struct object_array *array)
237{
Martin Koeglere5709a42007-04-22 16:43:58[diff] [blame]238 add_object_array_with_mode(obj, name, array, S_IFINVALID);
239}
240
241void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
242{
Linus Torvalds1f1e8952006-06-20 00:42:35[diff] [blame]243 unsigned nr = array->nr;
244 unsigned alloc = array->alloc;
245 struct object_array_entry *objects = array->objects;
246
247 if (nr >= alloc) {
248 alloc = (alloc + 32) * 2;
249 objects = xrealloc(objects, alloc * sizeof(*objects));
250 array->alloc = alloc;
251 array->objects = objects;
252 }
253 objects[nr].item = obj;
254 objects[nr].name = name;
Martin Koeglere5709a42007-04-22 16:43:58[diff] [blame]255 objects[nr].mode = mode;
Linus Torvalds1f1e8952006-06-20 00:42:35[diff] [blame]256 array->nr = ++nr;
257}