Update the merge scripts for the big git rename.
[git/git.git] / object.c
1 #include "object.h"
2 #include "blob.h"
3 #include "tree.h"
4 #include "commit.h"
5 #include "cache.h"
6 #include "tag.h"
7 #include <stdlib.h>
8 #include <string.h>
9
10 struct object **objs;
11 int nr_objs;
12 static int obj_allocs;
13
14 static int find_object(unsigned char *sha1)
15 {
16 int first = 0, last = nr_objs;
17
18 while (first < last) {
19 int next = (first + last) / 2;
20 struct object *obj = objs[next];
21 int cmp;
22
23 cmp = memcmp(sha1, obj->sha1, 20);
24 if (!cmp)
25 return next;
26 if (cmp < 0) {
27 last = next;
28 continue;
29 }
30 first = next+1;
31 }
32 return -first-1;
33 }
34
35 struct object *lookup_object(unsigned char *sha1)
36 {
37 int pos = find_object(sha1);
38 if (pos >= 0)
39 return objs[pos];
40 return NULL;
41 }
42
43 void created_object(unsigned char *sha1, struct object *obj)
44 {
45 int pos = find_object(sha1);
46
47 obj->parsed = 0;
48 memcpy(obj->sha1, sha1, 20);
49 obj->type = NULL;
50 obj->refs = NULL;
51 obj->used = 0;
52
53 if (pos >= 0)
54 die("Inserting %s twice\n", sha1_to_hex(sha1));
55 pos = -pos-1;
56
57 if (obj_allocs == nr_objs) {
58 obj_allocs = alloc_nr(obj_allocs);
59 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
60 }
61
62 /* Insert it into the right place */
63 memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
64 sizeof(struct object *));
65
66 objs[pos] = obj;
67 nr_objs++;
68 }
69
70 void add_ref(struct object *refer, struct object *target)
71 {
72 struct object_list **pp = &refer->refs;
73 struct object_list *p;
74
75 while ((p = *pp) != NULL) {
76 if (p->item == target)
77 return;
78 pp = &p->next;
79 }
80
81 target->used = 1;
82 p = xmalloc(sizeof(*p));
83 p->item = target;
84 p->next = NULL;
85 *pp = p;
86 }
87
88 void mark_reachable(struct object *obj, unsigned int mask)
89 {
90 struct object_list *p = obj->refs;
91
92 /* If we've been here already, don't bother */
93 if (obj->flags & mask)
94 return;
95 obj->flags |= mask;
96 while (p) {
97 mark_reachable(p->item, mask);
98 p = p->next;
99 }
100 }
101
102 struct object *parse_object(unsigned char *sha1)
103 {
104 unsigned long mapsize;
105 void *map = map_sha1_file(sha1, &mapsize);
106 if (map) {
107 char type[100];
108 unsigned long size;
109 void *buffer = unpack_sha1_file(map, mapsize, type, &size);
110 if (!buffer)
111 return NULL;
112 if (check_sha1_signature(sha1, buffer, size, type) < 0)
113 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
114 munmap(map, mapsize);
115 if (!strcmp(type, "blob")) {
116 struct blob *ret = lookup_blob(sha1);
117 parse_blob(ret);
118 return &ret->object;
119 } else if (!strcmp(type, "tree")) {
120 struct tree *ret = lookup_tree(sha1);
121 parse_tree(ret);
122 return &ret->object;
123 } else if (!strcmp(type, "commit")) {
124 struct commit *ret = lookup_commit(sha1);
125 parse_commit(ret);
126 return &ret->object;
127 } else if (!strcmp(type, "tag")) {
128 struct tag *ret = lookup_tag(sha1);
129 parse_tag(ret);
130 return &ret->object;
131 } else {
132 return NULL;
133 }
134 }
135 return NULL;
136 }