Convert struct object to object_id
[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)
24e8a3c9 12 if (((struct tag *)o)->tagged)
7999b2cf 13 o = parse_object(get_object_hash(*((struct tag *)o)->tagged));
24e8a3c9
MK
14 else
15 o = NULL;
9534f40b
JH
16 if (!o && warn) {
17 if (!warnlen)
18 warnlen = strlen(warn);
19 error("missing object referenced by '%.*s'", warnlen, warn);
20 }
37fde874
JH
21 return o;
22}
23
90108a24
JK
24struct object *deref_tag_noverify(struct object *o)
25{
26 while (o && o->type == OBJ_TAG) {
7999b2cf 27 o = parse_object(get_object_hash(*o));
90108a24
JK
28 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
29 o = ((struct tag *)o)->tagged;
30 else
31 o = NULL;
32 }
33 return o;
34}
35
5d6ccf5c 36struct tag *lookup_tag(const unsigned char *sha1)
2636f614 37{
100c5f3b
LT
38 struct object *obj = lookup_object(sha1);
39 if (!obj)
d36f51c1 40 return create_object(sha1, alloc_tag_node());
8ff226a9 41 return object_as_type(obj, OBJ_TAG, 0);
2636f614
DB
42}
43
e451d06b
SP
44static unsigned long parse_tag_date(const char *buf, const char *tail)
45{
46 const char *dateptr;
47
48 while (buf < tail && *buf++ != '>')
49 /* nada */;
50 if (buf >= tail)
51 return 0;
52 dateptr = buf;
53 while (buf < tail && *buf++ != '\n')
54 /* nada */;
55 if (buf >= tail)
56 return 0;
57 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
58 return strtoul(dateptr, NULL, 10);
59}
60
cf7b1cad 61int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
2636f614 62{
0ab17950 63 unsigned char sha1[20];
89e4202f 64 char type[20];
28de5b6b
SP
65 const char *bufptr = data;
66 const char *tail = bufptr + size;
67 const char *nl;
ae200ee5 68
2e0052a5
SP
69 if (item->object.parsed)
70 return 0;
71 item->object.parsed = 1;
2636f614 72
2636f614 73 if (size < 64)
bd2c39f5 74 return -1;
28de5b6b 75 if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
bd2c39f5 76 return -1;
28de5b6b 77 bufptr += 48; /* "object " + sha1 + "\n" */
2636f614 78
59556548 79 if (!starts_with(bufptr, "type "))
bd2c39f5 80 return -1;
28de5b6b
SP
81 bufptr += 5;
82 nl = memchr(bufptr, '\n', tail - bufptr);
83 if (!nl || sizeof(type) <= (nl - bufptr))
bd2c39f5 84 return -1;
eddda371 85 memcpy(type, bufptr, nl - bufptr);
28de5b6b
SP
86 type[nl - bufptr] = '\0';
87 bufptr = nl + 1;
2636f614 88
0ab17950
NP
89 if (!strcmp(type, blob_type)) {
90 item->tagged = &lookup_blob(sha1)->object;
91 } else if (!strcmp(type, tree_type)) {
92 item->tagged = &lookup_tree(sha1)->object;
93 } else if (!strcmp(type, commit_type)) {
94 item->tagged = &lookup_commit(sha1)->object;
95 } else if (!strcmp(type, tag_type)) {
96 item->tagged = &lookup_tag(sha1)->object;
97 } else {
98 error("Unknown type %s", type);
99 item->tagged = NULL;
100 }
101
59556548 102 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
85594252
NTND
103 ; /* good */
104 else
28de5b6b
SP
105 return -1;
106 bufptr += 4;
107 nl = memchr(bufptr, '\n', tail - bufptr);
108 if (!nl)
109 return -1;
110 item->tag = xmemdupz(bufptr, nl - bufptr);
111 bufptr = nl + 1;
112
59556548 113 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
e451d06b
SP
114 item->date = parse_tag_date(bufptr, tail);
115 else
116 item->date = 0;
117
2636f614 118 return 0;
bd2c39f5 119}
13019d41 120
bd2c39f5
NP
121int parse_tag(struct tag *item)
122{
21666f1a 123 enum object_type type;
bd2c39f5
NP
124 void *data;
125 unsigned long size;
126 int ret;
127
128 if (item->object.parsed)
129 return 0;
7999b2cf 130 data = read_sha1_file(get_object_hash(item->object), &type, &size);
bd2c39f5
NP
131 if (!data)
132 return error("Could not read %s",
f2fd0760 133 oid_to_hex(&item->object.oid));
21666f1a 134 if (type != OBJ_TAG) {
bd2c39f5
NP
135 free(data);
136 return error("Object %s not a tag",
f2fd0760 137 oid_to_hex(&item->object.oid));
bd2c39f5
NP
138 }
139 ret = parse_tag_buffer(item, data, size);
13019d41 140 free(data);
bd2c39f5 141 return ret;
2636f614 142}