diff options
Diffstat (limited to 'tag.c')
| -rw-r--r-- | tag.c | 169 |
1 files changed, 169 insertions, 0 deletions
@@ -0,0 +1,169 @@ +#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 object *deref_tag_noverify(struct object *o) +{ + while (o && o->type == OBJ_TAG) { + o = parse_object(o->sha1); + if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged) + o = ((struct tag *)o)->tagged; + else + o = NULL; + } + 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; +} + +/* + * Look at a signed tag object, and return the offset where + * the embedded detached signature begins, or the end of the + * data when there is no such signature. + */ +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; +} |