tag.h: Remove unused signature field
[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
MK
12 if (((struct tag *)o)->tagged)
13 o = parse_object(((struct tag *)o)->tagged->sha1);
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
5d6ccf5c 24struct tag *lookup_tag(const unsigned char *sha1)
2636f614 25{
100c5f3b
LT
26 struct object *obj = lookup_object(sha1);
27 if (!obj)
28 return create_object(sha1, OBJ_TAG, alloc_tag_node());
d1af002d 29 if (!obj->type)
1974632c
LT
30 obj->type = OBJ_TAG;
31 if (obj->type != OBJ_TAG) {
eb09626b 32 error("Object %s is a %s, not a tag",
885a86ab 33 sha1_to_hex(sha1), typename(obj->type));
2636f614
DB
34 return NULL;
35 }
36 return (struct tag *) obj;
37}
38
bd2c39f5 39int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
2636f614 40{
ae200ee5 41 int typelen, taglen;
0ab17950 42 unsigned char sha1[20];
ae200ee5 43 const char *type_line, *tag_line, *sig_line;
89e4202f 44 char type[20];
a0393ef6 45 const char *start = data;
ae200ee5 46
2e0052a5
SP
47 if (item->object.parsed)
48 return 0;
49 item->object.parsed = 1;
2636f614 50
2636f614 51 if (size < 64)
bd2c39f5 52 return -1;
0ab17950 53 if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, sha1))
bd2c39f5 54 return -1;
2636f614 55
1d7f171c 56 type_line = (char *) data + 48;
2636f614 57 if (memcmp("\ntype ", type_line-1, 6))
bd2c39f5 58 return -1;
2636f614 59
a0393ef6 60 tag_line = memchr(type_line, '\n', size - (type_line - start));
2636f614 61 if (!tag_line || memcmp("tag ", ++tag_line, 4))
bd2c39f5 62 return -1;
2636f614 63
a0393ef6 64 sig_line = memchr(tag_line, '\n', size - (tag_line - start));
2636f614 65 if (!sig_line)
bd2c39f5 66 return -1;
2636f614
DB
67 sig_line++;
68
69 typelen = tag_line - type_line - strlen("type \n");
70 if (typelen >= 20)
bd2c39f5 71 return -1;
89e4202f
DB
72 memcpy(type, type_line + 5, typelen);
73 type[typelen] = '\0';
2636f614 74 taglen = sig_line - tag_line - strlen("tag \n");
182af834 75 item->tag = xmemdupz(tag_line + 4, taglen);
2636f614 76
0ab17950
NP
77 if (!strcmp(type, blob_type)) {
78 item->tagged = &lookup_blob(sha1)->object;
79 } else if (!strcmp(type, tree_type)) {
80 item->tagged = &lookup_tree(sha1)->object;
81 } else if (!strcmp(type, commit_type)) {
82 item->tagged = &lookup_commit(sha1)->object;
83 } else if (!strcmp(type, tag_type)) {
84 item->tagged = &lookup_tag(sha1)->object;
85 } else {
86 error("Unknown type %s", type);
87 item->tagged = NULL;
88 }
89
2636f614 90 return 0;
bd2c39f5 91}
13019d41 92
bd2c39f5
NP
93int parse_tag(struct tag *item)
94{
21666f1a 95 enum object_type type;
bd2c39f5
NP
96 void *data;
97 unsigned long size;
98 int ret;
99
100 if (item->object.parsed)
101 return 0;
21666f1a 102 data = read_sha1_file(item->object.sha1, &type, &size);
bd2c39f5
NP
103 if (!data)
104 return error("Could not read %s",
105 sha1_to_hex(item->object.sha1));
21666f1a 106 if (type != OBJ_TAG) {
bd2c39f5
NP
107 free(data);
108 return error("Object %s not a tag",
109 sha1_to_hex(item->object.sha1));
110 }
111 ret = parse_tag_buffer(item, data, size);
13019d41 112 free(data);
bd2c39f5 113 return ret;
2636f614 114}