[PATCH] Fix memory leaks in git-fsck-cache
[git/git.git] / tag.c
1 #include "tag.h"
2 #include "cache.h"
3
4 const char *tag_type = "tag";
5
6 struct tag *lookup_tag(unsigned char *sha1)
7 {
8 struct object *obj = lookup_object(sha1);
9 if (!obj) {
10 struct tag *ret = xmalloc(sizeof(struct tag));
11 memset(ret, 0, sizeof(struct tag));
12 created_object(sha1, &ret->object);
13 ret->object.type = tag_type;
14 return ret;
15 }
16 if (obj->type != tag_type) {
17 error("Object %s is a %s, not a tree",
18 sha1_to_hex(sha1), obj->type);
19 return NULL;
20 }
21 return (struct tag *) obj;
22 }
23
24 int parse_tag(struct tag *item)
25 {
26 char type[20];
27 void *data, *bufptr;
28 unsigned long size;
29 int typelen, taglen;
30 unsigned char object[20];
31 const char *type_line, *tag_line, *sig_line;
32
33 if (item->object.parsed)
34 return 0;
35 item->object.parsed = 1;
36 data = bufptr = read_sha1_file(item->object.sha1, type, &size);
37 if (!data)
38 return error("Could not read %s",
39 sha1_to_hex(item->object.sha1));
40 if (strcmp(type, tag_type)) {
41 free(data);
42 return error("Object %s not a tag",
43 sha1_to_hex(item->object.sha1));
44 }
45
46 if (size < 64)
47 goto err;
48 if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
49 goto err;
50
51 item->tagged = parse_object(object);
52
53 type_line = data + 48;
54 if (memcmp("\ntype ", type_line-1, 6))
55 goto err;
56
57 tag_line = strchr(type_line, '\n');
58 if (!tag_line || memcmp("tag ", ++tag_line, 4))
59 goto err;
60
61 sig_line = strchr(tag_line, '\n');
62 if (!sig_line)
63 goto err;
64 sig_line++;
65
66 typelen = tag_line - type_line - strlen("type \n");
67 if (typelen >= 20)
68 goto err;
69 taglen = sig_line - tag_line - strlen("tag \n");
70 item->tag = xmalloc(taglen + 1);
71 memcpy(item->tag, tag_line + 4, taglen);
72 item->tag[taglen] = '\0';
73
74 free(data);
75 return 0;
76
77 err:
78 free(data);
79 return -1;
80 }