gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / object.c
blob50b6528001fe4bafdfe70126dc2078860c3d1969
1 #include "cache.h"
2 #include "object.h"
3 #include "blob.h"
4 #include "tree.h"
5 #include "commit.h"
6 #include "tag.h"
8 static struct object **obj_hash;
9 static int nr_objs, obj_hash_size;
11 unsigned int get_max_object_index(void)
13 return obj_hash_size;
16 struct object *get_indexed_object(unsigned int idx)
18 return obj_hash[idx];
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 */
29 const char *typename(unsigned int type)
31 if (type >= ARRAY_SIZE(object_type_strings))
32 return NULL;
33 return object_type_strings[type];
36 int type_from_string(const char *str)
38 int i;
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);
46 static unsigned int hash_obj(struct object *obj, unsigned int n)
48 unsigned int hash = *(unsigned int *)obj->sha1;
49 return hash % n;
52 static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
54 int j = hash_obj(obj, size);
56 while (hash[j]) {
57 j++;
58 if (j >= size)
59 j = 0;
61 hash[j] = obj;
64 static int hashtable_index(const unsigned char *sha1)
66 unsigned int i;
67 memcpy(&i, sha1, sizeof(unsigned int));
68 return (int)(i % obj_hash_size);
71 struct object *lookup_object(const unsigned char *sha1)
73 int i;
74 struct object *obj;
76 if (!obj_hash)
77 return NULL;
79 i = hashtable_index(sha1);
80 while ((obj = obj_hash[i]) != NULL) {
81 if (!hashcmp(sha1, obj->sha1))
82 break;
83 i++;
84 if (i == obj_hash_size)
85 i = 0;
87 return obj;
90 static void grow_object_hash(void)
92 int i;
93 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
94 struct object **new_hash;
96 new_hash = xcalloc(new_hash_size, sizeof(struct object *));
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);
103 free(obj_hash);
104 obj_hash = new_hash;
105 obj_hash_size = new_hash_size;
108 void *create_object(const unsigned char *sha1, int type, void *o)
110 struct object *obj = o;
112 obj->parsed = 0;
113 obj->used = 0;
114 obj->type = type;
115 obj->flags = 0;
116 hashcpy(obj->sha1, sha1);
118 if (obj_hash_size - 1 <= nr_objs * 2)
119 grow_object_hash();
121 insert_obj_hash(obj, obj_hash, obj_hash_size);
122 nr_objs++;
123 return obj;
126 struct object *lookup_unknown_object(const unsigned char *sha1)
128 struct object *obj = lookup_object(sha1);
129 if (!obj)
130 obj = create_object(sha1, OBJ_NONE, alloc_object_node());
131 return obj;
134 struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
136 struct object *obj;
137 int eaten = 0;
139 obj = NULL;
140 if (type == OBJ_BLOB) {
141 struct blob *blob = lookup_blob(sha1);
142 if (blob) {
143 if (parse_blob_buffer(blob, buffer, size))
144 return NULL;
145 obj = &blob->object;
147 } else if (type == OBJ_TREE) {
148 struct tree *tree = lookup_tree(sha1);
149 if (tree) {
150 obj = &tree->object;
151 if (!tree->object.parsed) {
152 if (parse_tree_buffer(tree, buffer, size))
153 return NULL;
154 eaten = 1;
157 } else if (type == OBJ_COMMIT) {
158 struct commit *commit = lookup_commit(sha1);
159 if (commit) {
160 if (parse_commit_buffer(commit, buffer, size))
161 return NULL;
162 if (!commit->buffer) {
163 commit->buffer = buffer;
164 eaten = 1;
166 obj = &commit->object;
168 } else if (type == OBJ_TAG) {
169 struct tag *tag = lookup_tag(sha1);
170 if (tag) {
171 if (parse_tag_buffer(tag, buffer, size))
172 return NULL;
173 obj = &tag->object;
175 } else {
176 warning("object %s has unknown type id %d\n", sha1_to_hex(sha1), type);
177 obj = NULL;
179 if (obj && obj->type == OBJ_NONE)
180 obj->type = type;
181 *eaten_p = eaten;
182 return obj;
185 struct object *parse_object(const unsigned char *sha1)
187 unsigned long size;
188 enum object_type type;
189 int eaten;
190 void *buffer = read_sha1_file(sha1, &type, &size);
192 if (buffer) {
193 struct object *obj;
194 if (check_sha1_signature(sha1, buffer, size, typename(type)) < 0) {
195 free(buffer);
196 error("sha1 mismatch %s\n", sha1_to_hex(sha1));
197 return NULL;
200 obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
201 if (!eaten)
202 free(buffer);
203 return obj;
205 return NULL;
208 struct object_list *object_list_insert(struct object *item,
209 struct object_list **list_p)
211 struct object_list *new_list = xmalloc(sizeof(struct object_list));
212 new_list->item = item;
213 new_list->next = *list_p;
214 *list_p = new_list;
215 return new_list;
218 void object_list_append(struct object *item,
219 struct object_list **list_p)
221 while (*list_p) {
222 list_p = &((*list_p)->next);
224 *list_p = xmalloc(sizeof(struct object_list));
225 (*list_p)->next = NULL;
226 (*list_p)->item = item;
229 unsigned object_list_length(struct object_list *list)
231 unsigned ret = 0;
232 while (list) {
233 list = list->next;
234 ret++;
236 return ret;
239 int object_list_contains(struct object_list *list, struct object *obj)
241 while (list) {
242 if (list->item == obj)
243 return 1;
244 list = list->next;
246 return 0;
249 void add_object_array(struct object *obj, const char *name, struct object_array *array)
251 add_object_array_with_mode(obj, name, array, S_IFINVALID);
254 void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
256 unsigned nr = array->nr;
257 unsigned alloc = array->alloc;
258 struct object_array_entry *objects = array->objects;
260 if (nr >= alloc) {
261 alloc = (alloc + 32) * 2;
262 objects = xrealloc(objects, alloc * sizeof(*objects));
263 array->alloc = alloc;
264 array->objects = objects;
266 objects[nr].item = obj;
267 objects[nr].name = name;
268 objects[nr].mode = mode;
269 array->nr = ++nr;