- m->header = header;
- m->header_accessible = header_accessible;
- m->footer = footer;
- m->footer_accessible = footer_accessible;
-
- if (BUS_MESSAGE_IS_GVARIANT(m)) {
- size_t ws;
-
- if (h->dbus2.cookie == 0)
- return -EBADMSG;
-
- /* dbus2 derives the sizes from the message size and
- the offset table at the end, since it is formatted as
- gvariant "yyyyuta{tv}v". Since the message itself is a
- structure with precisely to variable sized entries,
- there's only one offset in the table, which marks the
- end of the fields array. */
-
- ws = bus_gvariant_determine_word_size(message_size, 0);
- if (footer_accessible < ws)
- return -EBADMSG;
-
- m->fields_size = bus_gvariant_read_word_le((uint8_t*) footer + footer_accessible - ws, ws);
- if (ALIGN8(m->fields_size) > message_size - ws)
- return -EBADMSG;
- if (m->fields_size < sizeof(struct bus_header))
- return -EBADMSG;
-
- m->fields_size -= sizeof(struct bus_header);
- m->body_size = message_size - (sizeof(struct bus_header) + ALIGN8(m->fields_size));
- } else {
- if (h->dbus1.serial == 0)
- return -EBADMSG;
-
- /* dbus1 has the sizes in the header */
- m->fields_size = BUS_MESSAGE_BSWAP32(m, h->dbus1.fields_size);
- m->body_size = BUS_MESSAGE_BSWAP32(m, h->dbus1.body_size);
-
- if (sizeof(struct bus_header) + ALIGN8(m->fields_size) + m->body_size != message_size)
- return -EBADMSG;
- }
-