[PATCH] GIT: Try all addresses for given remote name
[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
8 struct object **objs;
9 int nr_objs;
10 static int obj_allocs;
11
12 static int find_object(const unsigned char *sha1)
13 {
14         int first = 0, last = nr_objs;
15
16         while (first < last) {
17                 int next = (first + last) / 2;
18                 struct object *obj = objs[next];
19                 int cmp;
20
21                 cmp = memcmp(sha1, obj->sha1, 20);
22                 if (!cmp)
23                         return next;
24                 if (cmp < 0) {
25                         last = next;
26                         continue;
27                 }
28                 first = next+1;
29         }
30         return -first-1;
31 }
32
33 struct object *lookup_object(const unsigned char *sha1)
34 {
35         int pos = find_object(sha1);
36         if (pos >= 0)
37                 return objs[pos];
38         return NULL;
39 }
40
41 void created_object(const unsigned char *sha1, struct object *obj)
42 {
43         int pos = find_object(sha1);
44
45         obj->parsed = 0;
46         memcpy(obj->sha1, sha1, 20);
47         obj->type = NULL;
48         obj->refs = NULL;
49         obj->used = 0;
50
51         if (pos >= 0)
52                 die("Inserting %s twice\n", sha1_to_hex(sha1));
53         pos = -pos-1;
54
55         if (obj_allocs == nr_objs) {
56                 obj_allocs = alloc_nr(obj_allocs);
57                 objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
58         }
59
60         /* Insert it into the right place */
61         memmove(objs + pos + 1, objs + pos, (nr_objs - pos) * 
62                 sizeof(struct object *));
63
64         objs[pos] = obj;
65         nr_objs++;
66 }
67
68 void add_ref(struct object *refer, struct object *target)
69 {
70         struct object_list **pp = &refer->refs;
71         struct object_list *p;
72         
73         while ((p = *pp) != NULL) {
74                 if (p->item == target)
75                         return;
76                 pp = &p->next;
77         }
78
79         target->used = 1;
80         p = xmalloc(sizeof(*p));
81         p->item = target;
82         p->next = NULL;
83         *pp = p;
84 }
85
86 void mark_reachable(struct object *obj, unsigned int mask)
87 {
88         struct object_list *p = obj->refs;
89
90         /* If we've been here already, don't bother */
91         if (obj->flags & mask)
92                 return;
93         obj->flags |= mask;
94         while (p) {
95                 mark_reachable(p->item, mask);
96                 p = p->next;
97         }
98 }
99
100 struct object *lookup_object_type(const unsigned char *sha1, const char *type)
101 {
102         if (!strcmp(type, blob_type)) {
103                 return &lookup_blob(sha1)->object;
104         } else if (!strcmp(type, tree_type)) {
105                 return &lookup_tree(sha1)->object;
106         } else if (!strcmp(type, commit_type)) {
107                 return &lookup_commit(sha1)->object;
108         } else if (!strcmp(type, tag_type)) {
109                 return &lookup_tag(sha1)->object;
110         } else {
111                 error("Unknown type %s", type);
112                 return NULL;
113         }
114 }
115
116 struct object *parse_object(const unsigned char *sha1)
117 {
118         unsigned long size;
119         char type[20];
120         void *buffer = read_sha1_file(sha1, type, &size);
121         if (buffer) {
122                 struct object *obj;
123                 if (check_sha1_signature(sha1, buffer, size, type) < 0)
124                         printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
125                 if (!strcmp(type, "blob")) {
126                         struct blob *blob = lookup_blob(sha1);
127                         parse_blob_buffer(blob, buffer, size);
128                         obj = &blob->object;
129                 } else if (!strcmp(type, "tree")) {
130                         struct tree *tree = lookup_tree(sha1);
131                         parse_tree_buffer(tree, buffer, size);
132                         obj = &tree->object;
133                 } else if (!strcmp(type, "commit")) {
134                         struct commit *commit = lookup_commit(sha1);
135                         parse_commit_buffer(commit, buffer, size);
136                         if (!commit->buffer) {
137                                 commit->buffer = buffer;
138                                 buffer = NULL;
139                         }
140                         obj = &commit->object;
141                 } else if (!strcmp(type, "tag")) {
142                         struct tag *tag = lookup_tag(sha1);
143                         parse_tag_buffer(tag, buffer, size);
144                         obj = &tag->object;
145                 } else {
146                         obj = NULL;
147                 }
148                 free(buffer);
149                 return obj;
150         }
151         return NULL;
152 }