format-patch: fix two-argument special case, and make it easier to pick single commits
[git/jnareb-git.git] / object.c
blob427e14cae2deb42138a439f7b2d69d3e06bb9417
1 #include "object.h"
2 #include "blob.h"
3 #include "tree.h"
4 #include "commit.h"
5 #include "cache.h"
6 #include "tag.h"
8 struct object **objs;
9 int nr_objs;
10 static int obj_allocs;
12 int track_object_refs = 1;
14 static int find_object(const unsigned char *sha1)
16 int first = 0, last = nr_objs;
18 while (first < last) {
19 int next = (first + last) / 2;
20 struct object *obj = objs[next];
21 int cmp;
23 cmp = memcmp(sha1, obj->sha1, 20);
24 if (!cmp)
25 return next;
26 if (cmp < 0) {
27 last = next;
28 continue;
30 first = next+1;
32 return -first-1;
35 struct object *lookup_object(const unsigned char *sha1)
37 int pos = find_object(sha1);
38 if (pos >= 0)
39 return objs[pos];
40 return NULL;
43 void created_object(const unsigned char *sha1, struct object *obj)
45 int pos = find_object(sha1);
47 obj->parsed = 0;
48 memcpy(obj->sha1, sha1, 20);
49 obj->type = NULL;
50 obj->refs = NULL;
51 obj->used = 0;
53 if (pos >= 0)
54 die("Inserting %s twice\n", sha1_to_hex(sha1));
55 pos = -pos-1;
57 if (obj_allocs == nr_objs) {
58 obj_allocs = alloc_nr(obj_allocs);
59 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
62 /* Insert it into the right place */
63 memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
64 sizeof(struct object *));
66 objs[pos] = obj;
67 nr_objs++;
70 struct object_refs *alloc_object_refs(unsigned count)
72 struct object_refs *refs;
73 size_t size = sizeof(*refs) + count*sizeof(struct object *);
75 refs = xmalloc(size);
76 memset(refs, 0, size);
77 refs->count = count;
78 return refs;
81 static int compare_object_pointers(const void *a, const void *b)
83 const struct object * const *pa = a;
84 const struct object * const *pb = b;
85 return *pa - *pb;
88 void set_object_refs(struct object *obj, struct object_refs *refs)
90 unsigned int i, j;
92 /* Do not install empty list of references */
93 if (refs->count < 1) {
94 free(refs);
95 return;
98 /* Sort the list and filter out duplicates */
99 qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
100 compare_object_pointers);
101 for (i = j = 1; i < refs->count; i++) {
102 if (refs->ref[i] != refs->ref[i - 1])
103 refs->ref[j++] = refs->ref[i];
105 if (j < refs->count) {
106 /* Duplicates were found - reallocate list */
107 size_t size = sizeof(*refs) + j*sizeof(struct object *);
108 refs->count = j;
109 refs = xrealloc(refs, size);
112 for (i = 0; i < refs->count; i++)
113 refs->ref[i]->used = 1;
114 obj->refs = refs;
117 void mark_reachable(struct object *obj, unsigned int mask)
119 if (!track_object_refs)
120 die("cannot do reachability with object refs turned off");
121 /* If we've been here already, don't bother */
122 if (obj->flags & mask)
123 return;
124 obj->flags |= mask;
125 if (obj->refs) {
126 const struct object_refs *refs = obj->refs;
127 unsigned i;
128 for (i = 0; i < refs->count; i++)
129 mark_reachable(refs->ref[i], mask);
133 struct object *lookup_object_type(const unsigned char *sha1, const char *type)
135 if (!type) {
136 return lookup_unknown_object(sha1);
137 } else if (!strcmp(type, blob_type)) {
138 return &lookup_blob(sha1)->object;
139 } else if (!strcmp(type, tree_type)) {
140 return &lookup_tree(sha1)->object;
141 } else if (!strcmp(type, commit_type)) {
142 return &lookup_commit(sha1)->object;
143 } else if (!strcmp(type, tag_type)) {
144 return &lookup_tag(sha1)->object;
145 } else {
146 error("Unknown type %s", type);
147 return NULL;
151 union any_object {
152 struct object object;
153 struct commit commit;
154 struct tree tree;
155 struct blob blob;
156 struct tag tag;
159 struct object *lookup_unknown_object(const unsigned char *sha1)
161 struct object *obj = lookup_object(sha1);
162 if (!obj) {
163 union any_object *ret = xmalloc(sizeof(*ret));
164 memset(ret, 0, sizeof(*ret));
165 created_object(sha1, &ret->object);
166 ret->object.type = NULL;
167 return &ret->object;
169 return obj;
172 struct object *parse_object(const unsigned char *sha1)
174 unsigned long size;
175 char type[20];
176 void *buffer = read_sha1_file(sha1, type, &size);
177 if (buffer) {
178 struct object *obj;
179 if (check_sha1_signature(sha1, buffer, size, type) < 0)
180 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
181 if (!strcmp(type, "blob")) {
182 struct blob *blob = lookup_blob(sha1);
183 parse_blob_buffer(blob, buffer, size);
184 obj = &blob->object;
185 } else if (!strcmp(type, "tree")) {
186 struct tree *tree = lookup_tree(sha1);
187 parse_tree_buffer(tree, buffer, size);
188 obj = &tree->object;
189 } else if (!strcmp(type, "commit")) {
190 struct commit *commit = lookup_commit(sha1);
191 parse_commit_buffer(commit, buffer, size);
192 if (!commit->buffer) {
193 commit->buffer = buffer;
194 buffer = NULL;
196 obj = &commit->object;
197 } else if (!strcmp(type, "tag")) {
198 struct tag *tag = lookup_tag(sha1);
199 parse_tag_buffer(tag, buffer, size);
200 obj = &tag->object;
201 } else {
202 obj = NULL;
204 free(buffer);
205 return obj;
207 return NULL;
210 struct object_list *object_list_insert(struct object *item,
211 struct object_list **list_p)
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;
220 void object_list_append(struct object *item,
221 struct object_list **list_p)
223 while (*list_p) {
224 list_p = &((*list_p)->next);
226 *list_p = xmalloc(sizeof(struct object_list));
227 (*list_p)->next = NULL;
228 (*list_p)->item = item;
231 unsigned object_list_length(struct object_list *list)
233 unsigned ret = 0;
234 while (list) {
235 list = list->next;
236 ret++;
238 return ret;
241 int object_list_contains(struct object_list *list, struct object *obj)
243 while (list) {
244 if (list->item == obj)
245 return 1;
246 list = list->next;
248 return 0;