move setting of object->type to alloc_* functions
[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 6
ac58c4c7 7#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
3d5854e7 8#define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
ac58c4c7 9
2636f614
DB
10const char *tag_type = "tag";
11
9534f40b 12struct object *deref_tag(struct object *o, const char *warn, int warnlen)
37fde874 13{
1974632c 14 while (o && o->type == OBJ_TAG)
24e8a3c9
MK
15 if (((struct tag *)o)->tagged)
16 o = parse_object(((struct tag *)o)->tagged->sha1);
17 else
18 o = NULL;
9534f40b
JH
19 if (!o && warn) {
20 if (!warnlen)
21 warnlen = strlen(warn);
22 error("missing object referenced by '%.*s'", warnlen, warn);
23 }
37fde874
JH
24 return o;
25}
26
90108a24
JK
27struct object *deref_tag_noverify(struct object *o)
28{
29 while (o && o->type == OBJ_TAG) {
30 o = parse_object(o->sha1);
31 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
32 o = ((struct tag *)o)->tagged;
33 else
34 o = NULL;
35 }
36 return o;
37}
38
5d6ccf5c 39struct tag *lookup_tag(const unsigned char *sha1)
2636f614 40{
100c5f3b
LT
41 struct object *obj = lookup_object(sha1);
42 if (!obj)
d36f51c1 43 return create_object(sha1, alloc_tag_node());
d1af002d 44 if (!obj->type)
1974632c 45 obj->type = OBJ_TAG;
d2c030d4
JH
46 if (obj->type != OBJ_TAG) {
47 error("Object %s is a %s, not a tag",
48 sha1_to_hex(sha1), typename(obj->type));
49 return NULL;
50 }
51 return (struct tag *) obj;
2636f614
DB
52}
53
e451d06b
SP
54static unsigned long parse_tag_date(const char *buf, const char *tail)
55{
56 const char *dateptr;
57
58 while (buf < tail && *buf++ != '>')
59 /* nada */;
60 if (buf >= tail)
61 return 0;
62 dateptr = buf;
63 while (buf < tail && *buf++ != '\n')
64 /* nada */;
65 if (buf >= tail)
66 return 0;
67 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
68 return strtoul(dateptr, NULL, 10);
69}
70
cf7b1cad 71int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
2636f614 72{
0ab17950 73 unsigned char sha1[20];
89e4202f 74 char type[20];
28de5b6b
SP
75 const char *bufptr = data;
76 const char *tail = bufptr + size;
77 const char *nl;
ae200ee5 78
2e0052a5
SP
79 if (item->object.parsed)
80 return 0;
81 item->object.parsed = 1;
2636f614 82
2636f614 83 if (size < 64)
bd2c39f5 84 return -1;
28de5b6b 85 if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
bd2c39f5 86 return -1;
28de5b6b 87 bufptr += 48; /* "object " + sha1 + "\n" */
2636f614 88
59556548 89 if (!starts_with(bufptr, "type "))
bd2c39f5 90 return -1;
28de5b6b
SP
91 bufptr += 5;
92 nl = memchr(bufptr, '\n', tail - bufptr);
93 if (!nl || sizeof(type) <= (nl - bufptr))
bd2c39f5 94 return -1;
28de5b6b
SP
95 strncpy(type, bufptr, nl - bufptr);
96 type[nl - bufptr] = '\0';
97 bufptr = nl + 1;
2636f614 98
0ab17950
NP
99 if (!strcmp(type, blob_type)) {
100 item->tagged = &lookup_blob(sha1)->object;
101 } else if (!strcmp(type, tree_type)) {
102 item->tagged = &lookup_tree(sha1)->object;
103 } else if (!strcmp(type, commit_type)) {
104 item->tagged = &lookup_commit(sha1)->object;
105 } else if (!strcmp(type, tag_type)) {
106 item->tagged = &lookup_tag(sha1)->object;
107 } else {
108 error("Unknown type %s", type);
109 item->tagged = NULL;
110 }
111
59556548 112 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
85594252
NTND
113 ; /* good */
114 else
28de5b6b
SP
115 return -1;
116 bufptr += 4;
117 nl = memchr(bufptr, '\n', tail - bufptr);
118 if (!nl)
119 return -1;
120 item->tag = xmemdupz(bufptr, nl - bufptr);
121 bufptr = nl + 1;
122
59556548 123 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
e451d06b
SP
124 item->date = parse_tag_date(bufptr, tail);
125 else
126 item->date = 0;
127
2636f614 128 return 0;
bd2c39f5 129}
13019d41 130
bd2c39f5
NP
131int parse_tag(struct tag *item)
132{
21666f1a 133 enum object_type type;
bd2c39f5
NP
134 void *data;
135 unsigned long size;
136 int ret;
137
138 if (item->object.parsed)
139 return 0;
21666f1a 140 data = read_sha1_file(item->object.sha1, &type, &size);
bd2c39f5
NP
141 if (!data)
142 return error("Could not read %s",
143 sha1_to_hex(item->object.sha1));
21666f1a 144 if (type != OBJ_TAG) {
bd2c39f5
NP
145 free(data);
146 return error("Object %s not a tag",
147 sha1_to_hex(item->object.sha1));
148 }
149 ret = parse_tag_buffer(item, data, size);
13019d41 150 free(data);
bd2c39f5 151 return ret;
2636f614 152}
ac58c4c7 153
2f47eae2
JH
154/*
155 * Look at a signed tag object, and return the offset where
156 * the embedded detached signature begins, or the end of the
157 * data when there is no such signature.
158 */
ac58c4c7
MG
159size_t parse_signature(const char *buf, unsigned long size)
160{
161 char *eol;
162 size_t len = 0;
59556548
CC
163 while (len < size && !starts_with(buf + len, PGP_SIGNATURE) &&
164 !starts_with(buf + len, PGP_MESSAGE)) {
ac58c4c7
MG
165 eol = memchr(buf + len, '\n', size - len);
166 len += eol ? eol - (buf + len) + 1 : size - len;
167 }
168 return len;
169}