Fix typo in git-checkout-script.
[git/git.git] / tag.c
CommitLineData
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1#include "tag.h"
2#include "cache.h"
3
4const char *tag_type = "tag";
5
5d6ccf5c 6struct tag *lookup_tag(const unsigned char *sha1)
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DB
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 }
d1af002d
NP
16 if (!obj->type)
17 obj->type = tag_type;
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DB
18 if (obj->type != tag_type) {
19 error("Object %s is a %s, not a tree",
20 sha1_to_hex(sha1), obj->type);
21 return NULL;
22 }
23 return (struct tag *) obj;
24}
25
bd2c39f5 26int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
2636f614 27{
ae200ee5
ET
28 int typelen, taglen;
29 unsigned char object[20];
30 const char *type_line, *tag_line, *sig_line;
31
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32 if (item->object.parsed)
33 return 0;
34 item->object.parsed = 1;
2636f614 35
2636f614 36 if (size < 64)
bd2c39f5 37 return -1;
2636f614 38 if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
bd2c39f5 39 return -1;
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40
41 item->tagged = parse_object(object);
770896e5
LT
42 if (item->tagged)
43 add_ref(&item->object, item->tagged);
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44
45 type_line = data + 48;
46 if (memcmp("\ntype ", type_line-1, 6))
bd2c39f5 47 return -1;
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48
49 tag_line = strchr(type_line, '\n');
50 if (!tag_line || memcmp("tag ", ++tag_line, 4))
bd2c39f5 51 return -1;
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52
53 sig_line = strchr(tag_line, '\n');
54 if (!sig_line)
bd2c39f5 55 return -1;
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56 sig_line++;
57
58 typelen = tag_line - type_line - strlen("type \n");
59 if (typelen >= 20)
bd2c39f5 60 return -1;
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DB
61 taglen = sig_line - tag_line - strlen("tag \n");
62 item->tag = xmalloc(taglen + 1);
63 memcpy(item->tag, tag_line + 4, taglen);
64 item->tag[taglen] = '\0';
65
66 return 0;
bd2c39f5 67}
13019d41 68
bd2c39f5
NP
69int parse_tag(struct tag *item)
70{
71 char type[20];
72 void *data;
73 unsigned long size;
74 int ret;
75
76 if (item->object.parsed)
77 return 0;
78 data = read_sha1_file(item->object.sha1, type, &size);
79 if (!data)
80 return error("Could not read %s",
81 sha1_to_hex(item->object.sha1));
82 if (strcmp(type, tag_type)) {
83 free(data);
84 return error("Object %s not a tag",
85 sha1_to_hex(item->object.sha1));
86 }
87 ret = parse_tag_buffer(item, data, size);
13019d41 88 free(data);
bd2c39f5 89 return ret;
2636f614 90}