Merge early part of branch 'jc/fetchupload'
[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"
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DB
7
8struct object **objs;
070879ca
JS
9static int nr_objs;
10int obj_allocs;
175785e5 11
3a7c352b 12int track_object_refs = 0;
8805ccac 13
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14static int hashtable_index(const unsigned char *sha1)
15{
2b796360
JH
16 unsigned int i;
17 memcpy(&i, sha1, sizeof(unsigned int));
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JS
18 return (int)(i % obj_allocs);
19}
20
5d6ccf5c 21static int find_object(const unsigned char *sha1)
175785e5 22{
2b796360 23 int i;
175785e5 24
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25 if (!objs)
26 return -1;
175785e5 27
2b796360 28 i = hashtable_index(sha1);
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JS
29 while (objs[i]) {
30 if (memcmp(sha1, objs[i]->sha1, 20) == 0)
31 return i;
32 i++;
33 if (i == obj_allocs)
34 i = 0;
35 }
36 return -1 - i;
175785e5
DB
37}
38
5d6ccf5c 39struct object *lookup_object(const unsigned char *sha1)
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DB
40{
41 int pos = find_object(sha1);
42 if (pos >= 0)
43 return objs[pos];
44 return NULL;
45}
46
5d6ccf5c 47void created_object(const unsigned char *sha1, struct object *obj)
175785e5 48{
070879ca 49 int pos;
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DB
50
51 obj->parsed = 0;
52 memcpy(obj->sha1, sha1, 20);
53 obj->type = NULL;
54 obj->refs = NULL;
55 obj->used = 0;
56
070879ca
JS
57 if (obj_allocs - 1 <= nr_objs * 2) {
58 int i, count = obj_allocs;
59 obj_allocs = (obj_allocs < 32 ? 32 : 2 * obj_allocs);
812666c8 60 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
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JS
61 memset(objs + count, 0, (obj_allocs - count)
62 * sizeof(struct object *));
d7ee090d 63 for (i = 0; i < obj_allocs; i++)
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JS
64 if (objs[i]) {
65 int j = find_object(objs[i]->sha1);
66 if (j != i) {
67 j = -1 - j;
68 objs[j] = objs[i];
69 objs[i] = NULL;
70 }
71 }
175785e5
DB
72 }
73
070879ca
JS
74 pos = find_object(sha1);
75 if (pos >= 0)
76 die("Inserting %s twice\n", sha1_to_hex(sha1));
77 pos = -pos-1;
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DB
78
79 objs[pos] = obj;
80 nr_objs++;
81}
82
4a4e6fd7 83struct object_refs *alloc_object_refs(unsigned count)
175785e5 84{
4a4e6fd7
SV
85 struct object_refs *refs;
86 size_t size = sizeof(*refs) + count*sizeof(struct object *);
8805ccac 87
90321c10 88 refs = xcalloc(1, size);
4a4e6fd7
SV
89 refs->count = count;
90 return refs;
91}
92
93static int compare_object_pointers(const void *a, const void *b)
94{
95 const struct object * const *pa = a;
96 const struct object * const *pb = b;
e23eff8b
JH
97 if (*pa == *pb)
98 return 0;
99 else if (*pa < *pb)
100 return -1;
101 else
102 return 1;
4a4e6fd7
SV
103}
104
105void set_object_refs(struct object *obj, struct object_refs *refs)
106{
107 unsigned int i, j;
108
109 /* Do not install empty list of references */
110 if (refs->count < 1) {
111 free(refs);
8805ccac 112 return;
4a4e6fd7 113 }
8805ccac 114
4a4e6fd7
SV
115 /* Sort the list and filter out duplicates */
116 qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
117 compare_object_pointers);
118 for (i = j = 1; i < refs->count; i++) {
119 if (refs->ref[i] != refs->ref[i - 1])
120 refs->ref[j++] = refs->ref[i];
121 }
122 if (j < refs->count) {
123 /* Duplicates were found - reallocate list */
124 size_t size = sizeof(*refs) + j*sizeof(struct object *);
125 refs->count = j;
126 refs = xrealloc(refs, size);
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DB
127 }
128
4a4e6fd7
SV
129 for (i = 0; i < refs->count; i++)
130 refs->ref[i]->used = 1;
131 obj->refs = refs;
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DB
132}
133
134void mark_reachable(struct object *obj, unsigned int mask)
135{
8805ccac
LT
136 if (!track_object_refs)
137 die("cannot do reachability with object refs turned off");
175785e5
DB
138 /* If we've been here already, don't bother */
139 if (obj->flags & mask)
140 return;
141 obj->flags |= mask;
4a4e6fd7
SV
142 if (obj->refs) {
143 const struct object_refs *refs = obj->refs;
144 unsigned i;
145 for (i = 0; i < refs->count; i++)
146 mark_reachable(refs->ref[i], mask);
175785e5
DB
147 }
148}
e9eefa67 149
89e4202f
DB
150struct object *lookup_object_type(const unsigned char *sha1, const char *type)
151{
66e481b0
DB
152 if (!type) {
153 return lookup_unknown_object(sha1);
154 } else if (!strcmp(type, blob_type)) {
89e4202f
DB
155 return &lookup_blob(sha1)->object;
156 } else if (!strcmp(type, tree_type)) {
157 return &lookup_tree(sha1)->object;
158 } else if (!strcmp(type, commit_type)) {
159 return &lookup_commit(sha1)->object;
160 } else if (!strcmp(type, tag_type)) {
161 return &lookup_tag(sha1)->object;
162 } else {
163 error("Unknown type %s", type);
164 return NULL;
165 }
166}
167
66e481b0
DB
168union any_object {
169 struct object object;
170 struct commit commit;
171 struct tree tree;
172 struct blob blob;
173 struct tag tag;
174};
175
176struct object *lookup_unknown_object(const unsigned char *sha1)
177{
178 struct object *obj = lookup_object(sha1);
179 if (!obj) {
90321c10 180 union any_object *ret = xcalloc(1, sizeof(*ret));
66e481b0
DB
181 created_object(sha1, &ret->object);
182 ret->object.type = NULL;
183 return &ret->object;
184 }
185 return obj;
186}
187
5d6ccf5c 188struct object *parse_object(const unsigned char *sha1)
e9eefa67 189{
c4584ae3
JH
190 unsigned long size;
191 char type[20];
192 void *buffer = read_sha1_file(sha1, type, &size);
193 if (buffer) {
bd2c39f5 194 struct object *obj;
c4584ae3 195 if (check_sha1_signature(sha1, buffer, size, type) < 0)
e9eefa67 196 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
8e440259 197 if (!strcmp(type, blob_type)) {
bd2c39f5
NP
198 struct blob *blob = lookup_blob(sha1);
199 parse_blob_buffer(blob, buffer, size);
200 obj = &blob->object;
8e440259 201 } else if (!strcmp(type, tree_type)) {
bd2c39f5 202 struct tree *tree = lookup_tree(sha1);
bd2c39f5 203 obj = &tree->object;
136f2e54
LT
204 if (!tree->object.parsed) {
205 parse_tree_buffer(tree, buffer, size);
206 buffer = NULL;
207 }
8e440259 208 } else if (!strcmp(type, commit_type)) {
bd2c39f5
NP
209 struct commit *commit = lookup_commit(sha1);
210 parse_commit_buffer(commit, buffer, size);
bd1e17e2
LT
211 if (!commit->buffer) {
212 commit->buffer = buffer;
213 buffer = NULL;
214 }
bd2c39f5 215 obj = &commit->object;
8e440259 216 } else if (!strcmp(type, tag_type)) {
bd2c39f5
NP
217 struct tag *tag = lookup_tag(sha1);
218 parse_tag_buffer(tag, buffer, size);
219 obj = &tag->object;
e9eefa67 220 } else {
bd2c39f5 221 obj = NULL;
e9eefa67 222 }
bd2c39f5
NP
223 free(buffer);
224 return obj;
e9eefa67
DB
225 }
226 return NULL;
227}
66e481b0
DB
228
229struct object_list *object_list_insert(struct object *item,
230 struct object_list **list_p)
231{
232 struct object_list *new_list = xmalloc(sizeof(struct object_list));
233 new_list->item = item;
234 new_list->next = *list_p;
235 *list_p = new_list;
236 return new_list;
237}
238
680bab3d
DB
239void object_list_append(struct object *item,
240 struct object_list **list_p)
241{
242 while (*list_p) {
243 list_p = &((*list_p)->next);
244 }
245 *list_p = xmalloc(sizeof(struct object_list));
246 (*list_p)->next = NULL;
247 (*list_p)->item = item;
248}
249
66e481b0
DB
250unsigned object_list_length(struct object_list *list)
251{
252 unsigned ret = 0;
253 while (list) {
254 list = list->next;
255 ret++;
256 }
257 return ret;
258}
259
260int object_list_contains(struct object_list *list, struct object *obj)
261{
262 while (list) {
263 if (list->item == obj)
264 return 1;
265 list = list->next;
266 }
267 return 0;
268}