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static pk_err_t obtain_chunk(struct pk_state *state, unsigned chunk,			void *tag, void **buf, unsigned *len){	pk_err_t ret;	void *local_buf;	gchar *device_buf;	gchar *ftag;	local_buf = g_malloc(state->parcel->chunksize);	/* Read the chunk from the local cache.  Don't check the	   tag, since decrypt will check the key.	   length is not zero only when chunk is present in local cache */	if (*len && !_cache_read_chunk(state, chunk, local_buf, *len, NULL)) {		*buf = local_buf;		return PK_SUCCESS;	}	/* Get chunk from hoard cache */	if (!hoard_get_chunk(state, tag, local_buf, len)) {		*buf = local_buf;		return PK_SUCCESS;	}	ftag = iu_bin2hex(tag, state->parcel->hashlen);	pk_log(LOG_CHUNK, "Tag %s not in hoard cache", ftag);	g_free(ftag);	/* Get chunk from horatio */	if (!device_get_chunk(state, tag, state->parcel->hashlen, &device_buf,				len)) {		*buf = device_buf;		g_free(local_buf);		return PK_SUCCESS;	}	/* Get chunk from server */	ret = transport_fetch_chunk(state->cpool, local_buf, chunk,				tag, len, TRUE);	*buf = local_buf;	return ret;}pk_err_t device_get_chunk(struct pk_state *state, void *tag, unsigned taglen,			gchar **buf, unsigned *filelen){	pk_err_t ret;	struct query *qry;	gboolean retry;	if (state->conf->device_path == NULL) {		return PK_NOTFOUND;	}again:	if (!begin(state->db)) {		return PK_SQLERR;	}	if (!query(&qry, state->db, "SELECT id FROM horatio.chunks "				"WHERE tag == ?", "b",				tag, taglen)) {		sql_log_err(state->db, "Error searching for chunk on device\n");		ret = PK_SQLERR;		goto bad;	}	if (query_has_row(state->db)) {		ret = _device_read_chunk(state, tag, taglen, buf, filelen);	} else {		printf("Chunk not found on device\n");		ret = PK_NOTFOUND;	}	query_free(qry);	return ret;bad:	retry = query_busy(state->db);	rollback(state->db);	if (retry) {		query_backoff(state->db);		goto again;	}	return ret;}