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chromium / external / github.com / git / git / refs/tags/v1.4.4 / . / object.c
blob: de244e206375d43f2bd327a0c3058ea24d53704e [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
Linus Torvalds885a86a2006-06-14 23:45:13[diff] [blame]21const char *type_names[] = {
Linus Torvalds19746322006-07-12 03:45:31[diff] [blame]22 "none", "commit", "tree", "blob", "tag",
23 "bad type 5", "bad type 6", "delta", "bad",
Linus Torvalds885a86a2006-06-14 23:45:13[diff] [blame]24};
25
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]26static unsigned int hash_obj(struct object *obj, unsigned int n)
27{
28 unsigned int hash = *(unsigned int *)obj->sha1;
29 return hash % n;
30}
31
32static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
33{
34 int j = hash_obj(obj, size);
35
36 while (hash[j]) {
37 j++;
38 if (j >= size)
39 j = 0;
40 }
41 hash[j] = obj;
42}
43
Johannes Schindelin070879c2006-02-12 01:57:57[diff] [blame]44static int hashtable_index(const unsigned char *sha1)
45{
Junio C Hamano2b796362006-02-12 02:51:19[diff] [blame]46 unsigned int i;
47 memcpy(&i, sha1, sizeof(unsigned int));
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]48 return (int)(i % obj_hash_size);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]49}
50
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]51struct object *lookup_object(const unsigned char *sha1)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]52{
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]53 int i;
54 struct object *obj;
55
56 if (!obj_hash)
57 return NULL;
58
59 i = hashtable_index(sha1);
60 while ((obj = obj_hash[i]) != NULL) {
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]61 if (!hashcmp(sha1, obj->sha1))
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]62 break;
63 i++;
64 if (i == obj_hash_size)
65 i = 0;
66 }
67 return obj;
68}
69
70static void grow_object_hash(void)
71{
72 int i;
73 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
74 struct object **new_hash;
75
Jonas Fonsecab3c952f2006-08-28 00:26:07[diff] [blame]76 new_hash = xcalloc(new_hash_size, sizeof(struct object *));
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]77 for (i = 0; i < obj_hash_size; i++) {
78 struct object *obj = obj_hash[i];
79 if (!obj)
80 continue;
81 insert_obj_hash(obj, new_hash, new_hash_size);
82 }
83 free(obj_hash);
84 obj_hash = new_hash;
85 obj_hash_size = new_hash_size;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]86}
87
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]88void created_object(const unsigned char *sha1, struct object *obj)
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]89{
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]90 obj->parsed = 0;
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]91 obj->used = 0;
Linus Torvalds19746322006-07-12 03:45:31[diff] [blame]92 obj->type = OBJ_NONE;
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]93 obj->flags = 0;
Shawn Pearcee7024962006-08-23 06:49:00[diff] [blame]94 hashcpy(obj->sha1, sha1);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]95
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]96 if (obj_hash_size - 1 <= nr_objs * 2)
97 grow_object_hash();
Johannes Schindelin070879c2006-02-12 01:57:57[diff] [blame]98
Linus Torvalds0556a112006-06-30 18:20:33[diff] [blame]99 insert_obj_hash(obj, obj_hash, obj_hash_size);
Daniel Barkalow175785e2005-04-18 18:39:48[diff] [blame]100 nr_objs++;
101}
102
Daniel Barkalow89e42022005-06-22 00:35:10[diff] [blame]103struct object *lookup_object_type(const unsigned char *sha1, const char *type)
104{
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]105 if (!type) {
106 return lookup_unknown_object(sha1);
107 } else if (!strcmp(type, blob_type)) {
Daniel Barkalow89e42022005-06-22 00:35:10[diff] [blame]108 return &lookup_blob(sha1)->object;
109 } else if (!strcmp(type, tree_type)) {
110 return &lookup_tree(sha1)->object;
111 } else if (!strcmp(type, commit_type)) {
112 return &lookup_commit(sha1)->object;
113 } else if (!strcmp(type, tag_type)) {
114 return &lookup_tag(sha1)->object;
115 } else {
116 error("Unknown type %s", type);
117 return NULL;
118 }
119}
120
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]121union any_object {
122 struct object object;
123 struct commit commit;
124 struct tree tree;
125 struct blob blob;
126 struct tag tag;
127};
128
129struct object *lookup_unknown_object(const unsigned char *sha1)
130{
131 struct object *obj = lookup_object(sha1);
132 if (!obj) {
Peter Eriksen90321c12006-04-03 18:30:46[diff] [blame]133 union any_object *ret = xcalloc(1, sizeof(*ret));
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]134 created_object(sha1, &ret->object);
Linus Torvalds19746322006-07-12 03:45:31[diff] [blame]135 ret->object.type = OBJ_NONE;
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]136 return &ret->object;
137 }
138 return obj;
139}
140
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]141struct object *parse_object_buffer(const unsigned char *sha1, const char *type, unsigned long size, void *buffer, int *eaten_p)
142{
143 struct object *obj;
144 int eaten = 0;
145
146 if (!strcmp(type, blob_type)) {
147 struct blob *blob = lookup_blob(sha1);
148 parse_blob_buffer(blob, buffer, size);
149 obj = &blob->object;
150 } else if (!strcmp(type, tree_type)) {
151 struct tree *tree = lookup_tree(sha1);
152 obj = &tree->object;
153 if (!tree->object.parsed) {
154 parse_tree_buffer(tree, buffer, size);
155 eaten = 1;
156 }
157 } else if (!strcmp(type, commit_type)) {
158 struct commit *commit = lookup_commit(sha1);
159 parse_commit_buffer(commit, buffer, size);
160 if (!commit->buffer) {
161 commit->buffer = buffer;
162 eaten = 1;
163 }
164 obj = &commit->object;
165 } else if (!strcmp(type, tag_type)) {
166 struct tag *tag = lookup_tag(sha1);
167 parse_tag_buffer(tag, buffer, size);
168 obj = &tag->object;
169 } else {
170 obj = NULL;
171 }
172 *eaten_p = eaten;
173 return obj;
174}
175
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]176struct object *parse_object(const unsigned char *sha1)
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]177{
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]178 unsigned long size;
179 char type[20];
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]180 int eaten;
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]181 void *buffer = read_sha1_file(sha1, type, &size);
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]182
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]183 if (buffer) {
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]184 struct object *obj;
Junio C Hamanoc4584ae2005-06-27 10:33:33[diff] [blame]185 if (check_sha1_signature(sha1, buffer, size, type) < 0)
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]186 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
Junio C Hamano9f613dd2006-09-15 20:30:02[diff] [blame]187
188 obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
189 if (!eaten)
190 free(buffer);
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]191 return obj;
Daniel Barkalowe9eefa62005-04-28 14:46:33[diff] [blame]192 }
193 return NULL;
194}
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]195
196struct object_list *object_list_insert(struct object *item,
197 struct object_list **list_p)
198{
199 struct object_list *new_list = xmalloc(sizeof(struct object_list));
200 new_list->item = item;
201 new_list->next = *list_p;
202 *list_p = new_list;
203 return new_list;
204}
205
Daniel Barkalow680bab32005-09-05 06:04:18[diff] [blame]206void object_list_append(struct object *item,
207 struct object_list **list_p)
208{
209 while (*list_p) {
210 list_p = &((*list_p)->next);
211 }
212 *list_p = xmalloc(sizeof(struct object_list));
213 (*list_p)->next = NULL;
214 (*list_p)->item = item;
215}
216
barkalow@iabervon.org66e481b2005-08-02 23:45:48[diff] [blame]217unsigned object_list_length(struct object_list *list)
218{
219 unsigned ret = 0;
220 while (list) {
221 list = list->next;
222 ret++;
223 }
224 return ret;
225}
226
227int object_list_contains(struct object_list *list, struct object *obj)
228{
229 while (list) {
230 if (list->item == obj)
231 return 1;
232 list = list->next;
233 }
234 return 0;
235}
Linus Torvalds1f1e8952006-06-20 00:42:35[diff] [blame]236
237void add_object_array(struct object *obj, const char *name, struct object_array *array)
238{
239 unsigned nr = array->nr;
240 unsigned alloc = array->alloc;
241 struct object_array_entry *objects = array->objects;
242
243 if (nr >= alloc) {
244 alloc = (alloc + 32) * 2;
245 objects = xrealloc(objects, alloc * sizeof(*objects));
246 array->alloc = alloc;
247 array->objects = objects;
248 }
249 objects[nr].item = obj;
250 objects[nr].name = name;
251 array->nr = ++nr;
252}