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tag: v1.7.5-rc1
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#include "cache.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"

#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
#define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"

const char *tag_type = "tag";

struct object *deref_tag(struct object *o, const char *warn, int warnlen)
{
while (o && o->type == OBJ_TAG)
if (((struct tag *)o)->tagged)
o = parse_object(((struct tag *)o)->tagged->sha1);
else
o = NULL;
if (!o && warn) {
if (!warnlen)
warnlen = strlen(warn);
error("missing object referenced by '%.*s'", warnlen, warn);
}
return o;
}

struct tag *lookup_tag(const unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);
if (!obj)
return create_object(sha1, OBJ_TAG, alloc_tag_node());
if (!obj->type)
obj->type = OBJ_TAG;
if (obj->type != OBJ_TAG) {
error("Object %s is a %s, not a tag",
sha1_to_hex(sha1), typename(obj->type));
return NULL;
}
return (struct tag *) obj;
}

static unsigned long parse_tag_date(const char *buf, const char *tail)
{
const char *dateptr;

while (buf < tail && *buf++ != '>')
/* nada */;
if (buf >= tail)
return 0;
dateptr = buf;
while (buf < tail && *buf++ != '\n')
/* nada */;
if (buf >= tail)
return 0;
/* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
return strtoul(dateptr, NULL, 10);
}

int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
{
unsigned char sha1[20];
char type[20];
const char *bufptr = data;
const char *tail = bufptr + size;
const char *nl;

if (item->object.parsed)
return 0;
item->object.parsed = 1;

if (size < 64)
return -1;
if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
return -1;
bufptr += 48; /* "object " + sha1 + "\n" */

if (prefixcmp(bufptr, "type "))
return -1;
bufptr += 5;
nl = memchr(bufptr, '\n', tail - bufptr);
if (!nl || sizeof(type) <= (nl - bufptr))
return -1;
strncpy(type, bufptr, nl - bufptr);
type[nl - bufptr] = '\0';
bufptr = nl + 1;

if (!strcmp(type, blob_type)) {
item->tagged = &lookup_blob(sha1)->object;
} else if (!strcmp(type, tree_type)) {
item->tagged = &lookup_tree(sha1)->object;
} else if (!strcmp(type, commit_type)) {
item->tagged = &lookup_commit(sha1)->object;
} else if (!strcmp(type, tag_type)) {
item->tagged = &lookup_tag(sha1)->object;
} else {
error("Unknown type %s", type);
item->tagged = NULL;
}

if (bufptr + 4 < tail && !prefixcmp(bufptr, "tag "))
; /* good */
else
return -1;
bufptr += 4;
nl = memchr(bufptr, '\n', tail - bufptr);
if (!nl)
return -1;
item->tag = xmemdupz(bufptr, nl - bufptr);
bufptr = nl + 1;

if (bufptr + 7 < tail && !prefixcmp(bufptr, "tagger "))
item->date = parse_tag_date(bufptr, tail);
else
item->date = 0;

return 0;
}

int parse_tag(struct tag *item)
{
enum object_type type;
void *data;
unsigned long size;
int ret;

if (item->object.parsed)
return 0;
data = read_sha1_file(item->object.sha1, &type, &size);
if (!data)
return error("Could not read %s",
sha1_to_hex(item->object.sha1));
if (type != OBJ_TAG) {
free(data);
return error("Object %s not a tag",
sha1_to_hex(item->object.sha1));
}
ret = parse_tag_buffer(item, data, size);
free(data);
return ret;
}

size_t parse_signature(const char *buf, unsigned long size)
{
char *eol;
size_t len = 0;
while (len < size && prefixcmp(buf + len, PGP_SIGNATURE) &&
prefixcmp(buf + len, PGP_MESSAGE)) {
eol = memchr(buf + len, '\n', size - len);
len += eol ? eol - (buf + len) + 1 : size - len;
}
return len;
}
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