-/*
- * This value is set in `base.flags` if the peeled value of the
- * current reference is known. In that case, `peeled` contains the
- * correct peeled value for the reference, which might be `null_sha1`
- * if the reference is not a tag or if it is broken.
- */
-#define REF_KNOWS_PEELED 0x40
-
-/*
- * An iterator over a packed-refs file that is currently mmapped.
- */
-struct mmapped_ref_iterator {
- struct ref_iterator base;
-
- struct packed_ref_cache *packed_refs;
-
- /* The current position in the mmapped file: */
- const char *pos;
-
- /* The end of the mmapped file: */
- const char *eof;
-
- struct object_id oid, peeled;
-
- struct strbuf refname_buf;
-};
-
-static int mmapped_ref_iterator_advance(struct ref_iterator *ref_iterator)
-{
- struct mmapped_ref_iterator *iter =
- (struct mmapped_ref_iterator *)ref_iterator;
- const char *p = iter->pos, *eol;
-
- strbuf_reset(&iter->refname_buf);
-
- if (iter->pos == iter->eof)
- return ref_iterator_abort(ref_iterator);
-
- iter->base.flags = REF_ISPACKED;
-
- if (iter->eof - p < GIT_SHA1_HEXSZ + 2 ||
- parse_oid_hex(p, &iter->oid, &p) ||
- !isspace(*p++))
- die_invalid_line(iter->packed_refs->refs->path,
- iter->pos, iter->eof - iter->pos);
-
- eol = memchr(p, '\n', iter->eof - p);
- if (!eol)
- die_unterminated_line(iter->packed_refs->refs->path,
- iter->pos, iter->eof - iter->pos);
-
- strbuf_add(&iter->refname_buf, p, eol - p);
- iter->base.refname = iter->refname_buf.buf;
-
- if (check_refname_format(iter->base.refname, REFNAME_ALLOW_ONELEVEL)) {
- if (!refname_is_safe(iter->base.refname))
- die("packed refname is dangerous: %s",
- iter->base.refname);
- oidclr(&iter->oid);
- iter->base.flags |= REF_BAD_NAME | REF_ISBROKEN;
- }
- if (iter->packed_refs->peeled == PEELED_FULLY ||
- (iter->packed_refs->peeled == PEELED_TAGS &&
- starts_with(iter->base.refname, "refs/tags/")))
- iter->base.flags |= REF_KNOWS_PEELED;
-
- iter->pos = eol + 1;
-
- if (iter->pos < iter->eof && *iter->pos == '^') {
- p = iter->pos + 1;
- if (iter->eof - p < GIT_SHA1_HEXSZ + 1 ||
- parse_oid_hex(p, &iter->peeled, &p) ||
- *p++ != '\n')
- die_invalid_line(iter->packed_refs->refs->path,
- iter->pos, iter->eof - iter->pos);
- iter->pos = p;
-
- /*
- * Regardless of what the file header said, we
- * definitely know the value of *this* reference. But
- * we suppress it if the reference is broken:
- */
- if ((iter->base.flags & REF_ISBROKEN)) {
- oidclr(&iter->peeled);
- iter->base.flags &= ~REF_KNOWS_PEELED;
- } else {
- iter->base.flags |= REF_KNOWS_PEELED;
- }
- } else {
- oidclr(&iter->peeled);
- }
-
- return ITER_OK;
-}
-
-static int mmapped_ref_iterator_peel(struct ref_iterator *ref_iterator,
- struct object_id *peeled)
-{
- struct mmapped_ref_iterator *iter =
- (struct mmapped_ref_iterator *)ref_iterator;
-
- if ((iter->base.flags & REF_KNOWS_PEELED)) {
- oidcpy(peeled, &iter->peeled);
- return is_null_oid(&iter->peeled) ? -1 : 0;
- } else if ((iter->base.flags & (REF_ISBROKEN | REF_ISSYMREF))) {
- return -1;
- } else {
- return !!peel_object(iter->oid.hash, peeled->hash);
- }
-}
-
-static int mmapped_ref_iterator_abort(struct ref_iterator *ref_iterator)
-{
- struct mmapped_ref_iterator *iter =
- (struct mmapped_ref_iterator *)ref_iterator;
-
- release_packed_ref_cache(iter->packed_refs);
- strbuf_release(&iter->refname_buf);
- base_ref_iterator_free(ref_iterator);
- return ITER_DONE;
-}
-
-static struct ref_iterator_vtable mmapped_ref_iterator_vtable = {
- mmapped_ref_iterator_advance,
- mmapped_ref_iterator_peel,
- mmapped_ref_iterator_abort
-};
-
-struct ref_iterator *mmapped_ref_iterator_begin(
- struct packed_ref_cache *packed_refs,
- const char *pos, const char *eof)
-{
- struct mmapped_ref_iterator *iter = xcalloc(1, sizeof(*iter));
- struct ref_iterator *ref_iterator = &iter->base;
-
- if (!packed_refs->buf)
- return empty_ref_iterator_begin();
-
- base_ref_iterator_init(ref_iterator, &mmapped_ref_iterator_vtable, 1);
-
- iter->packed_refs = packed_refs;
- acquire_packed_ref_cache(iter->packed_refs);
- iter->pos = pos;
- iter->eof = eof;
- strbuf_init(&iter->refname_buf, 0);
-
- iter->base.oid = &iter->oid;
-
- return ref_iterator;
-}
-