]>
Commit | Line | Data |
---|---|---|
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 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 | ||
39 | struct tag *lookup_tag(const unsigned char *sha1) | |
40 | { | |
41 | struct object *obj = lookup_object(sha1); | |
42 | if (!obj) | |
43 | return create_object(sha1, OBJ_TAG, alloc_tag_node()); | |
44 | if (!obj->type) | |
45 | obj->type = OBJ_TAG; | |
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; | |
52 | } | |
53 | ||
54 | static 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 | ||
71 | int parse_tag_buffer(struct tag *item, const void *data, unsigned long size) | |
72 | { | |
73 | unsigned char sha1[20]; | |
74 | char type[20]; | |
75 | const char *bufptr = data; | |
76 | const char *tail = bufptr + size; | |
77 | const char *nl; | |
78 | ||
79 | if (item->object.parsed) | |
80 | return 0; | |
81 | item->object.parsed = 1; | |
82 | ||
83 | if (size < 64) | |
84 | return -1; | |
85 | if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n') | |
86 | return -1; | |
87 | bufptr += 48; /* "object " + sha1 + "\n" */ | |
88 | ||
89 | if (prefixcmp(bufptr, "type ")) | |
90 | return -1; | |
91 | bufptr += 5; | |
92 | nl = memchr(bufptr, '\n', tail - bufptr); | |
93 | if (!nl || sizeof(type) <= (nl - bufptr)) | |
94 | return -1; | |
95 | strncpy(type, bufptr, nl - bufptr); | |
96 | type[nl - bufptr] = '\0'; | |
97 | bufptr = nl + 1; | |
98 | ||
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 | ||
112 | if (bufptr + 4 < tail && !prefixcmp(bufptr, "tag ")) | |
113 | ; /* good */ | |
114 | else | |
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 | ||
123 | if (bufptr + 7 < tail && !prefixcmp(bufptr, "tagger ")) | |
124 | item->date = parse_tag_date(bufptr, tail); | |
125 | else | |
126 | item->date = 0; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | int parse_tag(struct tag *item) | |
132 | { | |
133 | enum object_type type; | |
134 | void *data; | |
135 | unsigned long size; | |
136 | int ret; | |
137 | ||
138 | if (item->object.parsed) | |
139 | return 0; | |
140 | data = read_sha1_file(item->object.sha1, &type, &size); | |
141 | if (!data) | |
142 | return error("Could not read %s", | |
143 | sha1_to_hex(item->object.sha1)); | |
144 | if (type != OBJ_TAG) { | |
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); | |
150 | free(data); | |
151 | return ret; | |
152 | } | |
153 | ||
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 | */ | |
159 | size_t parse_signature(const char *buf, unsigned long size) | |
160 | { | |
161 | char *eol; | |
162 | size_t len = 0; | |
163 | while (len < size && prefixcmp(buf + len, PGP_SIGNATURE) && | |
164 | prefixcmp(buf + len, PGP_MESSAGE)) { | |
165 | eol = memchr(buf + len, '\n', size - len); | |
166 | len += eol ? eol - (buf + len) + 1 : size - len; | |
167 | } | |
168 | return len; | |
169 | } |