Clean up object creation to use more common code
[git/git.git] / tag.c
CommitLineData
2636f614 1#include "cache.h"
8f1d2e6f 2#include "tag.h"
0ab17950
NP
3#include "commit.h"
4#include "tree.h"
5#include "blob.h"
2636f614
DB
6
7const char *tag_type = "tag";
8
9534f40b 9struct object *deref_tag(struct object *o, const char *warn, int warnlen)
37fde874 10{
1974632c 11 while (o && o->type == OBJ_TAG)
37fde874 12 o = parse_object(((struct tag *)o)->tagged->sha1);
9534f40b
JH
13 if (!o && warn) {
14 if (!warnlen)
15 warnlen = strlen(warn);
16 error("missing object referenced by '%.*s'", warnlen, warn);
17 }
37fde874
JH
18 return o;
19}
20
5d6ccf5c 21struct tag *lookup_tag(const unsigned char *sha1)
2636f614 22{
100c5f3b
LT
23 struct object *obj = lookup_object(sha1);
24 if (!obj)
25 return create_object(sha1, OBJ_TAG, alloc_tag_node());
d1af002d 26 if (!obj->type)
1974632c
LT
27 obj->type = OBJ_TAG;
28 if (obj->type != OBJ_TAG) {
885a86ab
LT
29 error("Object %s is a %s, not a tree",
30 sha1_to_hex(sha1), typename(obj->type));
2636f614
DB
31 return NULL;
32 }
33 return (struct tag *) obj;
34}
35
bd2c39f5 36int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
2636f614 37{
ae200ee5 38 int typelen, taglen;
0ab17950 39 unsigned char sha1[20];
ae200ee5 40 const char *type_line, *tag_line, *sig_line;
89e4202f 41 char type[20];
ae200ee5 42
2636f614
DB
43 if (item->object.parsed)
44 return 0;
45 item->object.parsed = 1;
2636f614 46
2636f614 47 if (size < 64)
bd2c39f5 48 return -1;
0ab17950 49 if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, sha1))
bd2c39f5 50 return -1;
2636f614 51
1d7f171c 52 type_line = (char *) data + 48;
2636f614 53 if (memcmp("\ntype ", type_line-1, 6))
bd2c39f5 54 return -1;
2636f614
DB
55
56 tag_line = strchr(type_line, '\n');
57 if (!tag_line || memcmp("tag ", ++tag_line, 4))
bd2c39f5 58 return -1;
2636f614
DB
59
60 sig_line = strchr(tag_line, '\n');
61 if (!sig_line)
bd2c39f5 62 return -1;
2636f614
DB
63 sig_line++;
64
65 typelen = tag_line - type_line - strlen("type \n");
66 if (typelen >= 20)
bd2c39f5 67 return -1;
89e4202f
DB
68 memcpy(type, type_line + 5, typelen);
69 type[typelen] = '\0';
2636f614
DB
70 taglen = sig_line - tag_line - strlen("tag \n");
71 item->tag = xmalloc(taglen + 1);
72 memcpy(item->tag, tag_line + 4, taglen);
73 item->tag[taglen] = '\0';
74
0ab17950
NP
75 if (!strcmp(type, blob_type)) {
76 item->tagged = &lookup_blob(sha1)->object;
77 } else if (!strcmp(type, tree_type)) {
78 item->tagged = &lookup_tree(sha1)->object;
79 } else if (!strcmp(type, commit_type)) {
80 item->tagged = &lookup_commit(sha1)->object;
81 } else if (!strcmp(type, tag_type)) {
82 item->tagged = &lookup_tag(sha1)->object;
83 } else {
84 error("Unknown type %s", type);
85 item->tagged = NULL;
86 }
87
27dedf0c
JH
88 if (item->tagged && track_object_refs) {
89 struct object_refs *refs = alloc_object_refs(1);
90 refs->ref[0] = item->tagged;
91 set_object_refs(&item->object, refs);
92 }
89e4202f 93
2636f614 94 return 0;
bd2c39f5 95}
13019d41 96
bd2c39f5
NP
97int parse_tag(struct tag *item)
98{
21666f1a 99 enum object_type type;
bd2c39f5
NP
100 void *data;
101 unsigned long size;
102 int ret;
103
104 if (item->object.parsed)
105 return 0;
21666f1a 106 data = read_sha1_file(item->object.sha1, &type, &size);
bd2c39f5
NP
107 if (!data)
108 return error("Could not read %s",
109 sha1_to_hex(item->object.sha1));
21666f1a 110 if (type != OBJ_TAG) {
bd2c39f5
NP
111 free(data);
112 return error("Object %s not a tag",
113 sha1_to_hex(item->object.sha1));
114 }
115 ret = parse_tag_buffer(item, data, size);
13019d41 116 free(data);
bd2c39f5 117 return ret;
2636f614 118}