Merge branch 'jc/receive-verify'
[git/git.git] / object.c
... / ...
CommitLineData
1#include "cache.h"
2#include "object.h"
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
6#include "tag.h"
7
8static struct object **obj_hash;
9static int nr_objs, obj_hash_size;
10
11unsigned int get_max_object_index(void)
12{
13 return obj_hash_size;
14}
15
16struct object *get_indexed_object(unsigned int idx)
17{
18 return obj_hash[idx];
19}
20
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 */
27};
28
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
46static unsigned int hash_obj(struct object *obj, unsigned int n)
47{
48 unsigned int hash;
49 memcpy(&hash, obj->sha1, sizeof(unsigned int));
50 return hash % n;
51}
52
53static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
54{
55 unsigned int j = hash_obj(obj, size);
56
57 while (hash[j]) {
58 j++;
59 if (j >= size)
60 j = 0;
61 }
62 hash[j] = obj;
63}
64
65static unsigned int hashtable_index(const unsigned char *sha1)
66{
67 unsigned int i;
68 memcpy(&i, sha1, sizeof(unsigned int));
69 return i % obj_hash_size;
70}
71
72struct object *lookup_object(const unsigned char *sha1)
73{
74 unsigned int i;
75 struct object *obj;
76
77 if (!obj_hash)
78 return NULL;
79
80 i = hashtable_index(sha1);
81 while ((obj = obj_hash[i]) != NULL) {
82 if (!hashcmp(sha1, obj->sha1))
83 break;
84 i++;
85 if (i == obj_hash_size)
86 i = 0;
87 }
88 return obj;
89}
90
91static void grow_object_hash(void)
92{
93 int i;
94 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
95 struct object **new_hash;
96
97 new_hash = xcalloc(new_hash_size, sizeof(struct object *));
98 for (i = 0; i < obj_hash_size; i++) {
99 struct object *obj = obj_hash[i];
100 if (!obj)
101 continue;
102 insert_obj_hash(obj, new_hash, new_hash_size);
103 }
104 free(obj_hash);
105 obj_hash = new_hash;
106 obj_hash_size = new_hash_size;
107}
108
109void *create_object(const unsigned char *sha1, int type, void *o)
110{
111 struct object *obj = o;
112
113 obj->parsed = 0;
114 obj->used = 0;
115 obj->type = type;
116 obj->flags = 0;
117 hashcpy(obj->sha1, sha1);
118
119 if (obj_hash_size - 1 <= nr_objs * 2)
120 grow_object_hash();
121
122 insert_obj_hash(obj, obj_hash, obj_hash_size);
123 nr_objs++;
124 return obj;
125}
126
127struct object *lookup_unknown_object(const unsigned char *sha1)
128{
129 struct object *obj = lookup_object(sha1);
130 if (!obj)
131 obj = create_object(sha1, OBJ_NONE, alloc_object_node());
132 return obj;
133}
134
135struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
136{
137 struct object *obj;
138 int eaten = 0;
139
140 obj = NULL;
141 if (type == OBJ_BLOB) {
142 struct blob *blob = lookup_blob(sha1);
143 if (blob) {
144 if (parse_blob_buffer(blob, buffer, size))
145 return NULL;
146 obj = &blob->object;
147 }
148 } else if (type == OBJ_TREE) {
149 struct tree *tree = lookup_tree(sha1);
150 if (tree) {
151 obj = &tree->object;
152 if (!tree->object.parsed) {
153 if (parse_tree_buffer(tree, buffer, size))
154 return NULL;
155 eaten = 1;
156 }
157 }
158 } else if (type == OBJ_COMMIT) {
159 struct commit *commit = lookup_commit(sha1);
160 if (commit) {
161 if (parse_commit_buffer(commit, buffer, size))
162 return NULL;
163 if (!commit->buffer) {
164 commit->buffer = buffer;
165 eaten = 1;
166 }
167 obj = &commit->object;
168 }
169 } else if (type == OBJ_TAG) {
170 struct tag *tag = lookup_tag(sha1);
171 if (tag) {
172 if (parse_tag_buffer(tag, buffer, size))
173 return NULL;
174 obj = &tag->object;
175 }
176 } else {
177 warning("object %s has unknown type id %d\n", sha1_to_hex(sha1), type);
178 obj = NULL;
179 }
180 if (obj && obj->type == OBJ_NONE)
181 obj->type = type;
182 *eaten_p = eaten;
183 return obj;
184}
185
186struct object *parse_object(const unsigned char *sha1)
187{
188 unsigned long size;
189 enum object_type type;
190 int eaten;
191 const unsigned char *repl = lookup_replace_object(sha1);
192 void *buffer = read_sha1_file(sha1, &type, &size);
193
194 if (buffer) {
195 struct object *obj;
196 if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) {
197 free(buffer);
198 error("sha1 mismatch %s\n", sha1_to_hex(repl));
199 return NULL;
200 }
201
202 obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
203 if (!eaten)
204 free(buffer);
205 return obj;
206 }
207 return NULL;
208}
209
210struct object_list *object_list_insert(struct object *item,
211 struct object_list **list_p)
212{
213 struct object_list *new_list = xmalloc(sizeof(struct object_list));
214 new_list->item = item;
215 new_list->next = *list_p;
216 *list_p = new_list;
217 return new_list;
218}
219
220int object_list_contains(struct object_list *list, struct object *obj)
221{
222 while (list) {
223 if (list->item == obj)
224 return 1;
225 list = list->next;
226 }
227 return 0;
228}
229
230void add_object_array(struct object *obj, const char *name, struct object_array *array)
231{
232 add_object_array_with_mode(obj, name, array, S_IFINVALID);
233}
234
235void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
236{
237 unsigned nr = array->nr;
238 unsigned alloc = array->alloc;
239 struct object_array_entry *objects = array->objects;
240
241 if (nr >= alloc) {
242 alloc = (alloc + 32) * 2;
243 objects = xrealloc(objects, alloc * sizeof(*objects));
244 array->alloc = alloc;
245 array->objects = objects;
246 }
247 objects[nr].item = obj;
248 objects[nr].name = name;
249 objects[nr].mode = mode;
250 array->nr = ++nr;
251}
252
253void object_array_remove_duplicates(struct object_array *array)
254{
255 unsigned int ref, src, dst;
256 struct object_array_entry *objects = array->objects;
257
258 for (ref = 0; ref + 1 < array->nr; ref++) {
259 for (src = ref + 1, dst = src;
260 src < array->nr;
261 src++) {
262 if (!strcmp(objects[ref].name, objects[src].name))
263 continue;
264 if (src != dst)
265 objects[dst] = objects[src];
266 dst++;
267 }
268 array->nr = dst;
269 }
270}