consider previous pack undeltified object state only when reusing delta data
[git/git.git] / object.c
CommitLineData
8f1d2e6f 1#include "cache.h"
175785e5 2#include "object.h"
e9eefa67
DB
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
e9eefa67 6#include "tag.h"
175785e5
DB
7
8struct object **objs;
070879ca
JS
9static int nr_objs;
10int obj_allocs;
175785e5 11
885a86ab
LT
12const char *type_names[] = {
13 "none", "blob", "tree", "commit", "bad"
14};
15
070879ca
JS
16static int hashtable_index(const unsigned char *sha1)
17{
2b796360
JH
18 unsigned int i;
19 memcpy(&i, sha1, sizeof(unsigned int));
070879ca
JS
20 return (int)(i % obj_allocs);
21}
22
5d6ccf5c 23static int find_object(const unsigned char *sha1)
175785e5 24{
2b796360 25 int i;
175785e5 26
070879ca
JS
27 if (!objs)
28 return -1;
175785e5 29
2b796360 30 i = hashtable_index(sha1);
070879ca
JS
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;
175785e5
DB
39}
40
5d6ccf5c 41struct object *lookup_object(const unsigned char *sha1)
175785e5
DB
42{
43 int pos = find_object(sha1);
44 if (pos >= 0)
45 return objs[pos];
46 return NULL;
47}
48
5d6ccf5c 49void created_object(const unsigned char *sha1, struct object *obj)
175785e5 50{
070879ca 51 int pos;
175785e5
DB
52
53 obj->parsed = 0;
54 memcpy(obj->sha1, sha1, 20);
885a86ab 55 obj->type = TYPE_NONE;
175785e5
DB
56 obj->used = 0;
57
070879ca
JS
58 if (obj_allocs - 1 <= nr_objs * 2) {
59 int i, count = obj_allocs;
60 obj_allocs = (obj_allocs < 32 ? 32 : 2 * obj_allocs);
812666c8 61 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
070879ca
JS
62 memset(objs + count, 0, (obj_allocs - count)
63 * sizeof(struct object *));
d7ee090d 64 for (i = 0; i < obj_allocs; i++)
070879ca
JS
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 }
175785e5
DB
73 }
74
070879ca
JS
75 pos = find_object(sha1);
76 if (pos >= 0)
77 die("Inserting %s twice\n", sha1_to_hex(sha1));
78 pos = -pos-1;
175785e5
DB
79
80 objs[pos] = obj;
81 nr_objs++;
82}
83
89e4202f
DB
84struct object *lookup_object_type(const unsigned char *sha1, const char *type)
85{
66e481b0
DB
86 if (!type) {
87 return lookup_unknown_object(sha1);
88 } else if (!strcmp(type, blob_type)) {
89e4202f
DB
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
66e481b0
DB
102union any_object {
103 struct object object;
104 struct commit commit;
105 struct tree tree;
106 struct blob blob;
107 struct tag tag;
108};
109
110struct object *lookup_unknown_object(const unsigned char *sha1)
111{
112 struct object *obj = lookup_object(sha1);
113 if (!obj) {
90321c10 114 union any_object *ret = xcalloc(1, sizeof(*ret));
66e481b0 115 created_object(sha1, &ret->object);
885a86ab 116 ret->object.type = TYPE_NONE;
66e481b0
DB
117 return &ret->object;
118 }
119 return obj;
120}
121
5d6ccf5c 122struct object *parse_object(const unsigned char *sha1)
e9eefa67 123{
c4584ae3
JH
124 unsigned long size;
125 char type[20];
126 void *buffer = read_sha1_file(sha1, type, &size);
127 if (buffer) {
bd2c39f5 128 struct object *obj;
c4584ae3 129 if (check_sha1_signature(sha1, buffer, size, type) < 0)
e9eefa67 130 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
8e440259 131 if (!strcmp(type, blob_type)) {
bd2c39f5
NP
132 struct blob *blob = lookup_blob(sha1);
133 parse_blob_buffer(blob, buffer, size);
134 obj = &blob->object;
8e440259 135 } else if (!strcmp(type, tree_type)) {
bd2c39f5 136 struct tree *tree = lookup_tree(sha1);
bd2c39f5 137 obj = &tree->object;
136f2e54
LT
138 if (!tree->object.parsed) {
139 parse_tree_buffer(tree, buffer, size);
140 buffer = NULL;
141 }
8e440259 142 } else if (!strcmp(type, commit_type)) {
bd2c39f5
NP
143 struct commit *commit = lookup_commit(sha1);
144 parse_commit_buffer(commit, buffer, size);
bd1e17e2
LT
145 if (!commit->buffer) {
146 commit->buffer = buffer;
147 buffer = NULL;
148 }
bd2c39f5 149 obj = &commit->object;
8e440259 150 } else if (!strcmp(type, tag_type)) {
bd2c39f5
NP
151 struct tag *tag = lookup_tag(sha1);
152 parse_tag_buffer(tag, buffer, size);
153 obj = &tag->object;
e9eefa67 154 } else {
bd2c39f5 155 obj = NULL;
e9eefa67 156 }
bd2c39f5
NP
157 free(buffer);
158 return obj;
e9eefa67
DB
159 }
160 return NULL;
161}
66e481b0
DB
162
163struct 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
680bab3d
DB
173void 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
66e481b0
DB
184unsigned 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
194int 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}
1f1e895f
LT
203
204void 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}