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tag: v1.4.2-rc1
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file 108 lines (93 sloc) 2.624 kb
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#include "cache.h"
#include "tag.h"

const char *tag_type = "tag";

struct object *deref_tag(struct object *o, const char *warn, int warnlen)
{
while (o && o->type == OBJ_TAG)
o = parse_object(((struct tag *)o)->tagged->sha1);
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) {
                struct tag *ret = alloc_tag_node();
                created_object(sha1, &ret->object);
                ret->object.type = OBJ_TAG;
                return ret;
        }
if (!obj->type)
obj->type = OBJ_TAG;
        if (obj->type != OBJ_TAG) {
                error("Object %s is a %s, not a tree",
                      sha1_to_hex(sha1), typename(obj->type));
                return NULL;
        }
        return (struct tag *) obj;
}

int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
{
int typelen, taglen;
unsigned char object[20];
const char *type_line, *tag_line, *sig_line;
char type[20];

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

if (size < 64)
return -1;
if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, object))
return -1;

type_line = (char *) data + 48;
if (memcmp("\ntype ", type_line-1, 6))
return -1;

tag_line = strchr(type_line, '\n');
if (!tag_line || memcmp("tag ", ++tag_line, 4))
return -1;

sig_line = strchr(tag_line, '\n');
if (!sig_line)
return -1;
sig_line++;

typelen = tag_line - type_line - strlen("type \n");
if (typelen >= 20)
return -1;
memcpy(type, type_line + 5, typelen);
type[typelen] = '\0';
taglen = sig_line - tag_line - strlen("tag \n");
item->tag = xmalloc(taglen + 1);
memcpy(item->tag, tag_line + 4, taglen);
item->tag[taglen] = '\0';

item->tagged = lookup_object_type(object, type);
if (item->tagged && track_object_refs) {
struct object_refs *refs = alloc_object_refs(1);
refs->ref[0] = item->tagged;
set_object_refs(&item->object, refs);
}

return 0;
}

int parse_tag(struct tag *item)
{
char type[20];
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 (strcmp(type, tag_type)) {
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;
}
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