Add const to parse_{commit,tag}_buffer()
[git/git.git] / tag.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "blob.h"
6
7 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
8 #define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
9
10 const char *tag_type = "tag";
11
12 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
13 {
14 while (o && o->type == OBJ_TAG)
15 if (((struct tag *)o)->tagged)
16 o = parse_object(((struct tag *)o)->tagged->sha1);
17 else
18 o = NULL;
19 if (!o && warn) {
20 if (!warnlen)
21 warnlen = strlen(warn);
22 error("missing object referenced by '%.*s'", warnlen, warn);
23 }
24 return o;
25 }
26
27 struct tag *lookup_tag(const unsigned char *sha1)
28 {
29 struct object *obj = lookup_object(sha1);
30 if (!obj)
31 return create_object(sha1, OBJ_TAG, alloc_tag_node());
32 if (!obj->type)
33 obj->type = OBJ_TAG;
34 if (obj->type != OBJ_TAG) {
35 error("Object %s is a %s, not a tag",
36 sha1_to_hex(sha1), typename(obj->type));
37 return NULL;
38 }
39 return (struct tag *) obj;
40 }
41
42 static unsigned long parse_tag_date(const char *buf, const char *tail)
43 {
44 const char *dateptr;
45
46 while (buf < tail && *buf++ != '>')
47 /* nada */;
48 if (buf >= tail)
49 return 0;
50 dateptr = buf;
51 while (buf < tail && *buf++ != '\n')
52 /* nada */;
53 if (buf >= tail)
54 return 0;
55 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
56 return strtoul(dateptr, NULL, 10);
57 }
58
59 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
60 {
61 unsigned char sha1[20];
62 char type[20];
63 const char *bufptr = data;
64 const char *tail = bufptr + size;
65 const char *nl;
66
67 if (item->object.parsed)
68 return 0;
69 item->object.parsed = 1;
70
71 if (size < 64)
72 return -1;
73 if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
74 return -1;
75 bufptr += 48; /* "object " + sha1 + "\n" */
76
77 if (prefixcmp(bufptr, "type "))
78 return -1;
79 bufptr += 5;
80 nl = memchr(bufptr, '\n', tail - bufptr);
81 if (!nl || sizeof(type) <= (nl - bufptr))
82 return -1;
83 strncpy(type, bufptr, nl - bufptr);
84 type[nl - bufptr] = '\0';
85 bufptr = nl + 1;
86
87 if (!strcmp(type, blob_type)) {
88 item->tagged = &lookup_blob(sha1)->object;
89 } else if (!strcmp(type, tree_type)) {
90 item->tagged = &lookup_tree(sha1)->object;
91 } else if (!strcmp(type, commit_type)) {
92 item->tagged = &lookup_commit(sha1)->object;
93 } else if (!strcmp(type, tag_type)) {
94 item->tagged = &lookup_tag(sha1)->object;
95 } else {
96 error("Unknown type %s", type);
97 item->tagged = NULL;
98 }
99
100 if (prefixcmp(bufptr, "tag "))
101 return -1;
102 bufptr += 4;
103 nl = memchr(bufptr, '\n', tail - bufptr);
104 if (!nl)
105 return -1;
106 item->tag = xmemdupz(bufptr, nl - bufptr);
107 bufptr = nl + 1;
108
109 if (!prefixcmp(bufptr, "tagger "))
110 item->date = parse_tag_date(bufptr, tail);
111 else
112 item->date = 0;
113
114 return 0;
115 }
116
117 int parse_tag(struct tag *item)
118 {
119 enum object_type type;
120 void *data;
121 unsigned long size;
122 int ret;
123
124 if (item->object.parsed)
125 return 0;
126 data = read_sha1_file(item->object.sha1, &type, &size);
127 if (!data)
128 return error("Could not read %s",
129 sha1_to_hex(item->object.sha1));
130 if (type != OBJ_TAG) {
131 free(data);
132 return error("Object %s not a tag",
133 sha1_to_hex(item->object.sha1));
134 }
135 ret = parse_tag_buffer(item, data, size);
136 free(data);
137 return ret;
138 }
139
140 size_t parse_signature(const char *buf, unsigned long size)
141 {
142 char *eol;
143 size_t len = 0;
144 while (len < size && prefixcmp(buf + len, PGP_SIGNATURE) &&
145 prefixcmp(buf + len, PGP_MESSAGE)) {
146 eol = memchr(buf + len, '\n', size - len);
147 len += eol ? eol - (buf + len) + 1 : size - len;
148 }
149 return len;
150 }