Function load_multi_pack_index_one

midx.c:109–235

}

static struct multi_pack_index *load_multi_pack_index_one(struct odb_source *source,
							  const char *midx_name)
{
	struct repository *r = source->odb->repo;
	struct multi_pack_index *m = NULL;
	int fd;
	struct stat st;
	size_t midx_size;
	void *midx_map = NULL;
	uint32_t hash_version;
	uint32_t i;
	const char *cur_pack_name;
	struct chunkfile *cf = NULL;

	fd = git_open(midx_name);

	if (fd < 0)
		goto cleanup_fail;
	if (fstat(fd, &st)) {
		error_errno(_("failed to read %s"), midx_name);
		goto cleanup_fail;
	}

	midx_size = xsize_t(st.st_size);

	if (midx_size < (MIDX_HEADER_SIZE + r->hash_algo->rawsz)) {
		error(_("multi-pack-index file %s is too small"), midx_name);
		goto cleanup_fail;
	}

	midx_map = xmmap(NULL, midx_size, PROT_READ, MAP_PRIVATE, fd, 0);
	close(fd);

	CALLOC_ARRAY(m, 1);
	m->data = midx_map;
	m->data_len = midx_size;
	m->source = source;

	m->signature = get_be32(m->data);
	if (m->signature != MIDX_SIGNATURE)
		die(_("multi-pack-index signature 0x%08x does not match signature 0x%08x"),
		      m->signature, MIDX_SIGNATURE);

	m->version = m->data[MIDX_BYTE_FILE_VERSION];
	if (m->version != MIDX_VERSION_V1 && m->version != MIDX_VERSION_V2)
		die(_("multi-pack-index version %d not recognized"),
		      m->version);

	hash_version = m->data[MIDX_BYTE_HASH_VERSION];
	if (hash_version != oid_version(r->hash_algo)) {
		error(_("multi-pack-index hash version %u does not match version %u"),
		      hash_version, oid_version(r->hash_algo));
		goto cleanup_fail;
	}
	m->hash_len = r->hash_algo->rawsz;

	m->num_chunks = m->data[MIDX_BYTE_NUM_CHUNKS];