Merge branch 'jn/web' into next
[git] / object.c
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
8 struct object **objs;
9 static int nr_objs;
10 int obj_allocs;
11
12 const char *type_names[] = {
13         "none", "blob", "tree", "commit", "bad"
14 };
15
16 static int hashtable_index(const unsigned char *sha1)
17 {
18         unsigned int i;
19         memcpy(&i, sha1, sizeof(unsigned int));
20         return (int)(i % obj_allocs);
21 }
22
23 static int find_object(const unsigned char *sha1)
24 {
25         int i;
26
27         if (!objs)
28                 return -1;
29
30         i = hashtable_index(sha1);
31         while (objs[i]) {
32                 if (memcmp(sha1, objs[i]->sha1, 20) == 0)
33                         return i;
34                 i++;
35                 if (i == obj_allocs)
36                         i = 0;
37         }
38         return -1 - i;
39 }
40
41 struct object *lookup_object(const unsigned char *sha1)
42 {
43         int pos = find_object(sha1);
44         if (pos >= 0)
45                 return objs[pos];
46         return NULL;
47 }
48
49 void created_object(const unsigned char *sha1, struct object *obj)
50 {
51         int pos;
52
53         obj->parsed = 0;
54         memcpy(obj->sha1, sha1, 20);
55         obj->type = TYPE_NONE;
56         obj->used = 0;
57
58         if (obj_allocs - 1 <= nr_objs * 2) {
59                 int i, count = obj_allocs;
60                 obj_allocs = (obj_allocs < 32 ? 32 : 2 * obj_allocs);
61                 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
62                 memset(objs + count, 0, (obj_allocs - count)
63                                 * sizeof(struct object *));
64                 for (i = 0; i < obj_allocs; i++)
65                         if (objs[i]) {
66                                 int j = find_object(objs[i]->sha1);
67                                 if (j != i) {
68                                         j = -1 - j;
69                                         objs[j] = objs[i];
70                                         objs[i] = NULL;
71                                 }
72                         }
73         }
74
75         pos = find_object(sha1);
76         if (pos >= 0)
77                 die("Inserting %s twice\n", sha1_to_hex(sha1));
78         pos = -pos-1;
79
80         objs[pos] = obj;
81         nr_objs++;
82 }
83
84 struct object *lookup_object_type(const unsigned char *sha1, const char *type)
85 {
86         if (!type) {
87                 return lookup_unknown_object(sha1);
88         } else if (!strcmp(type, blob_type)) {
89                 return &lookup_blob(sha1)->object;
90         } else if (!strcmp(type, tree_type)) {
91                 return &lookup_tree(sha1)->object;
92         } else if (!strcmp(type, commit_type)) {
93                 return &lookup_commit(sha1)->object;
94         } else if (!strcmp(type, tag_type)) {
95                 return &lookup_tag(sha1)->object;
96         } else {
97                 error("Unknown type %s", type);
98                 return NULL;
99         }
100 }
101
102 union any_object {
103         struct object object;
104         struct commit commit;
105         struct tree tree;
106         struct blob blob;
107         struct tag tag;
108 };
109
110 struct object *lookup_unknown_object(const unsigned char *sha1)
111 {
112         struct object *obj = lookup_object(sha1);
113         if (!obj) {
114                 union any_object *ret = xcalloc(1, sizeof(*ret));
115                 created_object(sha1, &ret->object);
116                 ret->object.type = TYPE_NONE;
117                 return &ret->object;
118         }
119         return obj;
120 }
121
122 struct object *parse_object(const unsigned char *sha1)
123 {
124         unsigned long size;
125         char type[20];
126         void *buffer = read_sha1_file(sha1, type, &size);
127         if (buffer) {
128                 struct object *obj;
129                 if (check_sha1_signature(sha1, buffer, size, type) < 0)
130                         printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
131                 if (!strcmp(type, blob_type)) {
132                         struct blob *blob = lookup_blob(sha1);
133                         parse_blob_buffer(blob, buffer, size);
134                         obj = &blob->object;
135                 } else if (!strcmp(type, tree_type)) {
136                         struct tree *tree = lookup_tree(sha1);
137                         obj = &tree->object;
138                         if (!tree->object.parsed) {
139                                 parse_tree_buffer(tree, buffer, size);
140                                 buffer = NULL;
141                         }
142                 } else if (!strcmp(type, commit_type)) {
143                         struct commit *commit = lookup_commit(sha1);
144                         parse_commit_buffer(commit, buffer, size);
145                         if (!commit->buffer) {
146                                 commit->buffer = buffer;
147                                 buffer = NULL;
148                         }
149                         obj = &commit->object;
150                 } else if (!strcmp(type, tag_type)) {
151                         struct tag *tag = lookup_tag(sha1);
152                         parse_tag_buffer(tag, buffer, size);
153                         obj = &tag->object;
154                 } else {
155                         obj = NULL;
156                 }
157                 free(buffer);
158                 return obj;
159         }
160         return NULL;
161 }
162
163 struct object_list *object_list_insert(struct object *item,
164                                        struct object_list **list_p)
165 {
166         struct object_list *new_list = xmalloc(sizeof(struct object_list));
167         new_list->item = item;
168         new_list->next = *list_p;
169         *list_p = new_list;
170         return new_list;
171 }
172
173 void object_list_append(struct object *item,
174                         struct object_list **list_p)
175 {
176         while (*list_p) {
177                 list_p = &((*list_p)->next);
178         }
179         *list_p = xmalloc(sizeof(struct object_list));
180         (*list_p)->next = NULL;
181         (*list_p)->item = item;
182 }
183
184 unsigned object_list_length(struct object_list *list)
185 {
186         unsigned ret = 0;
187         while (list) {
188                 list = list->next;
189                 ret++;
190         }
191         return ret;
192 }
193
194 int object_list_contains(struct object_list *list, struct object *obj)
195 {
196         while (list) {
197                 if (list->item == obj)
198                         return 1;
199                 list = list->next;
200         }
201         return 0;
202 }
203
204 void add_object_array(struct object *obj, const char *name, struct object_array *array)
205 {
206         unsigned nr = array->nr;
207         unsigned alloc = array->alloc;
208         struct object_array_entry *objects = array->objects;
209
210         if (nr >= alloc) {
211                 alloc = (alloc + 32) * 2;
212                 objects = xrealloc(objects, alloc * sizeof(*objects));
213                 array->alloc = alloc;
214                 array->objects = objects;
215         }
216         objects[nr].item = obj;
217         objects[nr].name = name;
218         array->nr = ++nr;
219 }